docs(readme): clarify quality limitation for free accounts

.example-config

@@ -1,4 +0,0 @@
-arl_cookie = '1d9e90abb452a61b1b7463f0953e1b303c4e2e7e5fd404fde9b385f4de01c340ac0f62f1c8c1550405b0b9beded0e28c481e96a6148e8f4548351add5d7db746b2785ecf83b1768e5dd8cc73b1ad30c18d07c9cb37f5c6b9cd7a78a4de2aff11'
-license_token = 'AAAAA1bcDFgHJKLmnOPqrsTUvwXYZ12o3lmNOjR2xWiQRT3v5zxL4mKoWjxL82jD7sWx93KfYGsN2IkdPxsUw9PTas7oFbgR3nY9qpZmVyHFJKLPxT7sWmqErXyTn5iKoNpRtV7bPdQZ8qLmWoJpU2nKrXz6vW'
-secret_key = 'hTv1IAw19qWy9i3f'
-iv = '0001020304050607'

.gitignore

@@ -0,0 +1,3 @@
+.DS_Store
+build.sh
+builds/

CHANGELOG.md

@@ -0,0 +1,32 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [1.1.1] - 2025-06-16
+
+### Fixed
+- Restored ability to download tracks **without a Deezer Premium account** (limited to **MP3 128kbps** for free accounts).
+
+## [1.1.0] - 2025-05-19
+
+### Added
+- Support for downloading full albums and playlists with more than 40 tracks (previous limit removed).
+- Option to fetch and embed **BPM** and **musical key** into metadata tags.
+- New local **database system** (`tracks.db`) to track downloaded files and avoid re-downloading, even if files are renamed or moved.
+- Improved CLI **output formatting** for a cleaner and more informative user experience.
+
+### Changed
+- The `.godeez` file in the user’s home directory has been replaced by a `.godeez/` directory.  
+  It now stores both `config.toml` and the internal `tracks.db`.  
+  If you're upgrading from an older version, move your existing config into `.godeez/config.toml`.
+- Simplified `config.toml`: `iv` and `license_token` are no longer required.
+- Cleanup logic: corrupted or incomplete files are now automatically deleted on download failure.
+
+## [1.0.0] - 2024-10-15
+
+### Added
+
+- Initial release of **GoDeez** with basic Deezer album and playlist downloading capabilities.

README.md

@@ -2,6 +2,10 @@
   
 # GoDeez
 
+[![GitHub release](https://img.shields.io/github/v/release/mathismqn/godeez)](https://github.com/mathismqn/godeez/releases)
+[![License](https://img.shields.io/github/license/mathismqn/godeez)](https://github.com/mathismqn/godeez/blob/main/LICENSE)
+[![Last commit](https://img.shields.io/github/last-commit/mathismqn/godeez)](https://github.com/mathismqn/godeez/commits/main)
+
 A simple Go tool for downloading music from [Deezer](https://www.deezer.com).
 
 [Features](#features) •
@@ -16,8 +20,10 @@ A simple Go tool for downloading music from [Deezer](https://www.deezer.com).
 ## Features
 
 * Download playlists and albums from Deezer
-* Select audio quality: MP3 128kbps, MP3 320kbps, or FLAC
+* Select audio quality: MP3 128kbps, MP3 320kbps, or FLAC (⚠️ non-premium accounts are limited to 128kbps)
 * Automatically adds metadata tags to downloaded files
+* Fetch and tag songs with BPM and musical key
+* Smart skip system: avoids re-downloading already existing files using hashes and metadata
 * Cross-platform support (works on Windows, macOS, and Linux)
 * Simple and easy-to-use CLI
 
@@ -32,26 +38,28 @@ To install **GoDeez**, simply download the latest binary for your platform from
 Example (Linux/macOS):
 ```bash
 # Move the downloaded binary to /usr/local/bin for easy access from anywhere
-mv godeez-1.0.0-linux-amd64 /usr/local/bin/godeez
+mv godeez-1.1.0-linux-amd64 /usr/local/bin/godeez
 ```
 
 ## Configuration
 
-The first time you run **GoDeez**, a configuration file named .godeez will be automatically generated in your home directory ($HOME on Linux/macOS, %USERPROFILE% on Windows).
+The first time you run **GoDeez**, a configuration directory named `.godeez` will be automatically created in your home directory (`$HOME` on Linux/macOS, `%USERPROFILE%` on Windows).
 
-This configuration file contains several important variables that you need to fill out manually. Below are the steps for retrieving and setting each variable.
+Inside this directory:
+- `config.toml`: main configuration file which contains several important variables that you need to fill out manually
+- `tracks.db`: internal database used to track downloaded files and prevent duplicates
 
 ### Steps to configure
 
-1. Run the application for the first time: This generates the .godeez configuration file in your home directory.
+1. Run the application for the first time: this creates the `.godeez` directory and the `config.toml` file inside it.
-2. Edit the configuration file: Open the .godeez file with a text editor to set the required variables.
+2. Edit the `config.toml` file with a text editor to set the required values.
 
 ### Variables to configure
 
-Here are the key variables you need to set in the .godeez file:
+Here are the key variables you need to set in `config.toml`:
 
 1. `arl_cookie`
-* **What is it?**: The arl_cookie is a session cookie used for authentication with Deezer. Without this cookie, the downloader cannot access your account to retrieve playlists, albums, or songs.
+* **What is it?**: The `arl_cookie` is a session cookie used for authentication with Deezer. Without this cookie, the downloader cannot access your account to retrieve playlists, albums, or songs.
 * **How to retrieve it**:
 	1.	Open your browser and log in to your Deezer account.
 	2.	Open the Developer Tools (right-click on the page and select “Inspect” or press F12).
@@ -59,28 +67,31 @@ Here are the key variables you need to set in the .godeez file:
 	4.	In the left panel, look for Cookies and select `https://www.deezer.com`.
 	5.	Find the arl cookie and copy its value.
 
-2. `license_token`
+2. `secret_key`
-* **What is it?**: The license_token is required to access Deezer’s media URLs for downloading songs. This token is found in the network requests your browser makes when playing a song.
+* **What is it?**: The `secret_key` is a cryptographic value used to decrypt Deezer’s media files.
-* **How to retrieve it**:
-  1.	Open Developer Tools in your browser (right-click on the page and select “Inspect” or press F12).
-	2.	Go to the Network tab.
-	3.	Start playing a song on Deezer and look for a request to `https://media.deezer.com/v1/get_url`.
-	4.	Select the request and in the Request Data section, find the license_token.
-	5.	Copy the license_token value.
-
-3. `secret_key`
-* **What is it?**: The secret_key is a cryptographic value used alongside the iv to decrypt Deezer’s media files.
 * **How to retrieve it?**: While we cannot provide the specific secret_key in this documentation, it can be found online through various sources or developer communities that focus on Deezer.
 
-4. `iv`
+3. `output_dir` (optional)
-* **What is it?**: This is another cryptographic variable needed to decrypt media streams from Deezer.
+* **What is it?**: The `output_dir` is the path where downloaded music files will be saved.
-* **How to retrieve it?**: The iv can be found in the [.example-config](https://github.com/mathismqn/godeez/blob/main/.example-config) file included with this project.
+* **Default**: If left empty, it defaults to `~/Music/GoDeez`.
+* **Note**: Once set, it's recommended not to change it, as this may interfere with the skip system that relies on consistent file paths and hash indexing to detect already downloaded songs.
+
+### Example
+
+Here's an example of a minimal `config.toml` you can customize:
+```toml
+# ~/.godeez/config.toml
+
+arl_cookie = 'your_arl_cookie_here'
+secret_key = 'your_secret_key_here'
+output_dir = ''  # optional
+```
 
 ## Usage
 
 ### CLI Overview
 
-When you run **godeez** without any additional commands, you’ll see a general help menu:
+When you run `godeez` without any additional commands, you’ll see a general help menu:
 ```bash
 GoDeez is a tool to download music from Deezer
 
@@ -93,7 +104,7 @@ Available Commands:
   help        Help about any command
 
 Flags:
-      --config string   config file (default is $HOME/.godeez)
+      --config string   config file (default ~/.godeez/config.toml)
   -h, --help            help for godeez
 
 Use "godeez [command] --help" for more information about a command.
@@ -108,16 +119,17 @@ Usage:
   godeez download [command]
 
 Available Commands:
-  album       Download songs from one or more albums
+  album       Download songs from album
-  playlist    Download songs from one or more playlists
+  playlist    Download songs from playlist
 
 Flags:
-  -h, --help             help for download
+      --bpm                fetch BPM/key and add to file tags
-  -o, --output string    output directory (default is current directory)
+  -h, --help               help for download
-  -q, --quality string   download quality [mp3_128, mp3_320, flac, best] (default is best)
+  -q, --quality string     download quality [mp3_128, mp3_320, flac, best] (default "best")
+  -t, --timeout duration   timeout for each download (e.g. 10s, 1m, 2m30s) (default 2m0s)
 
 Global Flags:
-      --config string   config file (default is $HOME/.godeez)
+      --config string   config file (default ~/.godeez/config.toml)
 
 Use "godeez download [command] --help" for more information about a command.
 ```
@@ -133,3 +145,7 @@ Every bit of support counts, so don’t forget to give the project a star if you
 ## License
 
 This project is licensed under the MIT License. See the [LICENSE](https://github.com/mathismqn/godeez/blob/main/LICENSE) file for details.
+
+---
+
+> ⚠️ This tool is provided for educational and personal use only. Please ensure your usage complies with Deezer’s Terms of Service.

cmd/download.go

@@ -1,19 +1,16 @@
 package cmd
 
 import (
+	"context"
+	"errors"
 	"fmt"
-	"os"
+	"time"
-	"path"
-	"strings"
 
-	"github.com/flytam/filenamify"
+	"github.com/mathismqn/godeez/internal/downloader"
-	"github.com/mathismqn/godeez/internal/deezer"
-	"github.com/mathismqn/godeez/internal/tags"
 	"github.com/spf13/cobra"
 )
 
-var outputDir string
+var opts downloader.Options
-var quality string
 
 var downloadCmd = &cobra.Command{
 	Use:   "download",
@@ -22,137 +19,40 @@ var downloadCmd = &cobra.Command{
 
 func init() {
 	RootCmd.AddCommand(downloadCmd)
-	downloadCmd.PersistentFlags().StringVarP(&outputDir, "output", "o", "", "output directory (default is current directory)")
+
-	downloadCmd.PersistentFlags().StringVarP(&quality, "quality", "q", "", "download quality [mp3_128, mp3_320, flac, best] (default is best)")
+	downloadCmd.PersistentFlags().StringVarP(&opts.Quality, "quality", "q", "best", "download quality [mp3_128, mp3_320, flac, best]")
+	downloadCmd.PersistentFlags().DurationVarP(&opts.Timeout, "timeout", "t", 2*time.Minute, "timeout for each download (e.g. 10s, 1m, 2m30s)")
+	downloadCmd.PersistentFlags().BoolVar(&opts.BPM, "bpm", false, "fetch BPM/key and add to file tags")
+
+	downloadCmd.AddCommand(
+		newDownloadCmd("album"),
+		newDownloadCmd("playlist"),
+	)
 }
 
-func validateInput() {
+func newDownloadCmd(resourceType string) *cobra.Command {
-	if quality == "" {
+	cmd := &cobra.Command{
-		quality = "best"
+		Use:   fmt.Sprintf("%s <%s_id>", resourceType, resourceType),
-	}
+		Short: fmt.Sprintf("Download songs from %s", resourceType),
+		Args:  cobra.ExactArgs(1),
+		PreRunE: func(cmd *cobra.Command, args []string) error {
+			return opts.Validate()
+		},
+		RunE: func(cmd *cobra.Command, args []string) error {
+			ctx := cmd.Context()
+			dl := downloader.New(appConfig, resourceType)
 
-	validQualities := map[string]bool{
+			if err := dl.Run(ctx, opts, args[0]); err != nil {
-		"mp3_128": true,
+				if errors.Is(err, context.Canceled) {
-		"mp3_320": true,
+					return nil
-		"flac":    true,
-		"best":    true,
-	}
-	if !validQualities[quality] {
-		fmt.Fprintf(os.Stderr, "Error: invalid quality option: %s\n", quality)
-		os.Exit(1)
-	}
-}
-
-func downloadContent(contentType string, args []string) {
-	nArgs := len(args)
-	separator := "--------------------------------------------------"
-
-	for i, id := range args {
-		fmt.Println(separator)
-		fmt.Printf("[%d/%d] Getting data for %s %s...", i+1, nArgs, contentType, id)
-
-		var resource deezer.Resource
-		var songs []*deezer.Song
-
-		switch contentType {
-		case "album":
-			album := &deezer.Album{}
-			if err := deezer.GetData(album, id); err != nil {
-				fmt.Printf("\r[%d/%d] Getting data for album %s... FAILED\n", i+1, nArgs, id)
-				fmt.Fprintf(os.Stderr, "Error: could not get album data: %v\n", err)
-				continue
-			}
-			resource = album
-			songs = album.GetSongs()
-		case "playlist":
-			playlist := &deezer.Playlist{}
-			if err := deezer.GetData(playlist, id); err != nil {
-				fmt.Printf("\r[%d/%d] Getting data for playlist %s... FAILED\n", i+1, nArgs, id)
-				fmt.Fprintf(os.Stderr, "Error: could not get playlist data: %v\n", err)
-				continue
-			}
-			if playlist.Data.Status == 1 && playlist.Data.CollabKey == "" {
-				fmt.Printf("\r[%d/%d] Getting data for playlist %s... FAILED\n", i+1, nArgs, id)
-				fmt.Fprintf(os.Stderr, "Error: playlist is private and no valid arl cookie was provided\n")
-				continue
-			}
-
-			resource = playlist
-			songs = playlist.GetSongs()
-		}
-
-		fmt.Printf("\r[%d/%d] Getting data for %s %s... DONE\n", i+1, nArgs, contentType, id)
-
-		output := resource.GetOutputPath(outputDir)
-		if _, err := os.Stat(output); os.IsNotExist(err) {
-			if err := os.MkdirAll(output, 0755); err != nil {
-				fmt.Fprintf(os.Stderr, "Error: could not create output directory: %v\n", err)
-				continue
-			}
-		}
-
-		title := resource.GetTitle()
-		fmt.Printf("Starting download of %s: %s\n", contentType, title)
-
-		for _, song := range songs {
-			songTitle := song.Title
-			if song.Version != "" {
-				songTitle = fmt.Sprintf("%s %s", song.Title, song.Version)
-			}
-
-			fmt.Printf("    Downloading %s...", songTitle)
-
-			media, err := song.GetMediaData(quality)
-			if err != nil {
-				fmt.Printf("\r    Downloading %s... FAILED\n", songTitle)
-				fmt.Fprintf(os.Stderr, "Error: could not get media data: %v\n", err)
-				if err.Error() == "invalid license token" {
-					os.Exit(1)
 				}
-				continue
+
+				return err
 			}
 
-			if len(media.Data) == 0 || len(media.Data[0].Media) == 0 || len(media.Data[0].Media[0].Sources) == 0 {
+			return nil
-				fmt.Printf("\r    Downloading %s... FAILED\n", songTitle)
+		},
-				fmt.Fprintf(os.Stderr, "Error: could not get media sources\n")
-				continue
-			}
-
-			url := media.Data[0].Media[0].Sources[0].URL
-			for _, source := range media.Data[0].Media[0].Sources {
-				if source.Provider == "ak" {
-					url = source.URL
-					break
-				}
-			}
-
-			ext := "mp3"
-			if media.Data[0].Media[0].Format == "FLAC" {
-				ext = "flac"
-			}
-			trackNumber := ""
-			if contentType == "album" {
-				trackNumber = song.TrackNumber + "."
-			}
-
-			fileName := fmt.Sprintf("%s %s - %s.%s", trackNumber, songTitle, strings.Join(song.Contributors.MainArtists, ", "), ext)
-			fileName, _ = filenamify.Filenamify(fileName, filenamify.Options{})
-			filePath := path.Join(output, fileName)
-
-			err = media.Download(url, filePath, song.ID)
-			if err != nil {
-				fmt.Printf("\r    Downloading %s... FAILED\n", songTitle)
-				fmt.Fprintf(os.Stderr, "Error: could not download song: %v\n", err)
-				continue
-			}
-			fmt.Printf("\r    Downloading %s... DONE\n", songTitle)
-
-			if err := tags.AddTags(resource, song, filePath); err != nil {
-				fmt.Fprintf(os.Stderr, "Error: could not add tags to song: %v\n", err)
-			}
-		}
 	}
 
-	fmt.Println(separator)
+	return cmd
-	fmt.Println("All downloads completed")
 }

cmd/download_album.go

@@ -1,17 +0,0 @@
-package cmd
-
-import "github.com/spf13/cobra"
-
-var albumCmd = &cobra.Command{
-	Use:   "album [album_id...]",
-	Short: "Download songs from one or more albums",
-	Args:  cobra.MinimumNArgs(1),
-	Run: func(cmd *cobra.Command, args []string) {
-		validateInput()
-		downloadContent("album", args)
-	},
-}
-
-func init() {
-	downloadCmd.AddCommand(albumCmd)
-}

cmd/download_playlist.go

@@ -1,17 +0,0 @@
-package cmd
-
-import "github.com/spf13/cobra"
-
-var playlistCmd = &cobra.Command{
-	Use:   "playlist [playlist_id...]",
-	Short: "Download songs from one or more playlists",
-	Args:  cobra.MinimumNArgs(1),
-	Run: func(cmd *cobra.Command, args []string) {
-		validateInput()
-		downloadContent("playlist", args)
-	},
-}
-
-func init() {
-	downloadCmd.AddCommand(playlistCmd)
-}

cmd/root.go

@@ -1,78 +1,27 @@
 package cmd
 
 import (
-	"fmt"
-	"os"
-	"path"
-
 	"github.com/mathismqn/godeez/internal/config"
 	"github.com/spf13/cobra"
-	"github.com/spf13/viper"
 )
 
-var cfgFile string
+var (
+	cfgPath   string
+	appConfig *config.Config
+)
 
 var RootCmd = &cobra.Command{
-	Use:   "godeez",
+	Use:          "godeez",
-	Short: "GoDeez is a tool to download music from Deezer",
+	Short:        "GoDeez is a tool to download music from Deezer",
-	Run: func(cmd *cobra.Command, args []string) {
+	SilenceUsage: true,
-		cmd.Help()
+	PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
+		var err error
+		appConfig, err = config.New(cfgPath)
+
+		return err
 	},
 }
 
 func init() {
-	RootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.godeez)")
+	RootCmd.PersistentFlags().StringVar(&cfgPath, "config", "", "config file (default ~/.godeez/config.toml)")
-	cobra.OnInitialize(initConfig)
-}
-
-func initConfig() {
-	if cfgFile != "" {
-		viper.SetConfigFile(cfgFile)
-	} else {
-		homedir, err := os.UserHomeDir()
-		if err != nil {
-			fmt.Fprintf(os.Stderr, "Error: could not get home directory: %v\n", err)
-			os.Exit(1)
-		}
-
-		path := path.Join(homedir, ".godeez")
-		if _, err := os.Stat(path); os.IsNotExist(err) {
-			fmt.Printf("Config file not found, creating one at %s\n", path)
-
-			content := []byte("arl_cookie = ''\nlicense_token = ''\nsecret_key = ''\niv = '0001020304050607'\n")
-			if err := os.WriteFile(path, content, 0644); err != nil {
-				fmt.Fprintf(os.Stderr, "Error: could not create config file: %v\n", err)
-				os.Exit(1)
-			}
-		}
-
-		viper.AddConfigPath(homedir)
-		viper.SetConfigName(".godeez")
-	}
-
-	viper.SetConfigType("toml")
-	viper.AutomaticEnv()
-	if err := viper.ReadInConfig(); err != nil {
-		fmt.Fprintf(os.Stderr, "Error: could not read config file: %v\n", err)
-		os.Exit(1)
-	}
-
-	cfg := &config.Cfg
-	if err := viper.Unmarshal(&cfg); err != nil {
-		fmt.Fprintf(os.Stderr, "Error: could not unmarshal config file: %v\n", err)
-		os.Exit(1)
-	}
-
-	if cfg.LicenseToken == "" {
-		fmt.Fprintln(os.Stderr, "Error: license_token is not set in config file")
-		os.Exit(1)
-	}
-	if cfg.SecretKey == "" {
-		fmt.Fprintln(os.Stderr, "Error: secret_key is not set in config file")
-		os.Exit(1)
-	}
-	if cfg.IV == "" {
-		fmt.Fprintln(os.Stderr, "Error: iv is not set in config file")
-		os.Exit(1)
-	}
 }

go.mod

@@ -8,9 +8,13 @@ require (
 )
 
 require (
+	github.com/andybalholm/cascadia v1.3.2 // indirect
+	github.com/fatih/color v1.14.1 // indirect
 	github.com/fsnotify/fsnotify v1.7.0 // indirect
 	github.com/hashicorp/hcl v1.0.0 // indirect
 	github.com/magiconair/properties v1.8.7 // indirect
+	github.com/mattn/go-colorable v0.1.13 // indirect
+	github.com/mattn/go-isatty v0.0.17 // indirect
 	github.com/mitchellh/mapstructure v1.5.0 // indirect
 	github.com/pelletier/go-toml/v2 v2.2.2 // indirect
 	github.com/sagikazarmark/locafero v0.4.0 // indirect
@@ -22,19 +26,24 @@ require (
 	go.uber.org/atomic v1.9.0 // indirect
 	go.uber.org/multierr v1.9.0 // indirect
 	golang.org/x/exp v0.0.0-20230905200255-921286631fa9 // indirect
-	golang.org/x/sys v0.26.0 // indirect
+	golang.org/x/net v0.29.0 // indirect
+	golang.org/x/sys v0.29.0 // indirect
+	golang.org/x/term v0.25.0 // indirect
 	golang.org/x/text v0.19.0 // indirect
 	gopkg.in/ini.v1 v1.67.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
 
 require (
+	github.com/PuerkitoBio/goquery v1.10.0
 	github.com/bogem/id3v2/v2 v2.1.4
+	github.com/briandowns/spinner v1.23.2
 	github.com/flytam/filenamify v1.2.0
 	github.com/go-flac/flacpicture/v2 v2.0.2
 	github.com/go-flac/flacvorbis/v2 v2.0.2
 	github.com/go-flac/go-flac/v2 v2.0.1
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
-	github.com/spf13/pflag v1.0.5 // indirect
+	github.com/spf13/pflag v1.0.6 // indirect
+	go.etcd.io/bbolt v1.4.0
 	golang.org/x/crypto v0.28.0
 )

go.sum

@@ -1,10 +1,18 @@
+github.com/PuerkitoBio/goquery v1.10.0 h1:6fiXdLuUvYs2OJSvNRqlNPoBm6YABE226xrbavY5Wv4=
+github.com/PuerkitoBio/goquery v1.10.0/go.mod h1:TjZZl68Q3eGHNBA8CWaxAN7rOU1EbDz3CWuolcO5Yu4=
+github.com/andybalholm/cascadia v1.3.2 h1:3Xi6Dw5lHF15JtdcmAHD3i1+T8plmv7BQ/nsViSLyss=
+github.com/andybalholm/cascadia v1.3.2/go.mod h1:7gtRlve5FxPPgIgX36uWBX58OdBsSS6lUvCFb+h7KvU=
 github.com/bogem/id3v2/v2 v2.1.4 h1:CEwe+lS2p6dd9UZRlPc1zbFNIha2mb2qzT1cCEoNWoI=
 github.com/bogem/id3v2/v2 v2.1.4/go.mod h1:l+gR8MZ6rc9ryPTPkX77smS5Me/36gxkMgDayZ9G1vY=
+github.com/briandowns/spinner v1.23.2 h1:Zc6ecUnI+YzLmJniCfDNaMbW0Wid1d5+qcTq4L2FW8w=
+github.com/briandowns/spinner v1.23.2/go.mod h1:LaZeM4wm2Ywy6vO571mvhQNRcWfRUnXOs0RcKV0wYKM=
 github.com/cpuguy83/go-md2man/v2 v2.0.4/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc h1:U9qPSI2PIWSS1VwoXQT9A3Wy9MM3WgvqSxFWenqJduM=
 github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/fatih/color v1.14.1 h1:qfhVLaG5s+nCROl1zJsZRxFeYrHLqWroPOQ8BWiNb4w=
+github.com/fatih/color v1.14.1/go.mod h1:2oHN61fhTpgcxD3TSWCgKDiH1+x4OiDVVGH8WlgGZGg=
 github.com/flytam/filenamify v1.2.0 h1:7RiSqXYR4cJftDQ5NuvljKMfd/ubKnW/j9C6iekChgI=
 github.com/flytam/filenamify v1.2.0/go.mod h1:Dzf9kVycwcsBlr2ATg6uxjqiFgKGH+5SKFuhdeP5zu8=
 github.com/frankban/quicktest v1.14.6 h1:7Xjx+VpznH+oBnejlPUj8oUpdxnVs4f8XU8WnHkI4W8=
@@ -29,6 +37,11 @@ github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
 github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
 github.com/magiconair/properties v1.8.7 h1:IeQXZAiQcpL9mgcAe1Nu6cX9LLw6ExEHKjN0VQdvPDY=
 github.com/magiconair/properties v1.8.7/go.mod h1:Dhd985XPs7jluiymwWYZ0G4Z61jb3vdS329zhj2hYo0=
+github.com/mattn/go-colorable v0.1.13 h1:fFA4WZxdEF4tXPZVKMLwD8oUnCTTo08duU7wxecdEvA=
+github.com/mattn/go-colorable v0.1.13/go.mod h1:7S9/ev0klgBDR4GtXTXX8a3vIGJpMovkB8vQcUbaXHg=
+github.com/mattn/go-isatty v0.0.16/go.mod h1:kYGgaQfpe5nmfYZH+SKPsOc2e4SrIfOl2e/yFXSvRLM=
+github.com/mattn/go-isatty v0.0.17 h1:BTarxUcIeDqL27Mc+vyvdWYSL28zpIhv3RoTdsLMPng=
+github.com/mattn/go-isatty v0.0.17/go.mod h1:kYGgaQfpe5nmfYZH+SKPsOc2e4SrIfOl2e/yFXSvRLM=
 github.com/mitchellh/mapstructure v1.5.0 h1:jeMsZIYE/09sWLaz43PL7Gy6RuMjD2eJVyuac5Z2hdY=
 github.com/mitchellh/mapstructure v1.5.0/go.mod h1:bFUtVrKA4DC2yAKiSyO/QUcy7e+RRV2QTWOzhPopBRo=
 github.com/pelletier/go-toml/v2 v2.2.2 h1:aYUidT7k73Pcl9nb2gScu7NSrKCSHIDE89b3+6Wq+LM=
@@ -51,8 +64,9 @@ github.com/spf13/cast v1.6.0 h1:GEiTHELF+vaR5dhz3VqZfFSzZjYbgeKDpBxQVS4GYJ0=
 github.com/spf13/cast v1.6.0/go.mod h1:ancEpBxwJDODSW/UG4rDrAqiKolqNNh2DX3mk86cAdo=
 github.com/spf13/cobra v1.8.1 h1:e5/vxKd/rZsfSJMUX1agtjeTDf+qv1/JdBF8gg5k9ZM=
 github.com/spf13/cobra v1.8.1/go.mod h1:wHxEcudfqmLYa8iTfL+OuZPbBZkmvliBWKIezN3kD9Y=
-github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
 github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
+github.com/spf13/pflag v1.0.6 h1:jFzHGLGAlb3ruxLB8MhbI6A8+AQX/2eW4qeyNZXNp2o=
+github.com/spf13/pflag v1.0.6/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
 github.com/spf13/viper v1.19.0 h1:RWq5SEjt8o25SROyN3z2OrDB9l7RPd3lwTWU8EcEdcI=
 github.com/spf13/viper v1.19.0/go.mod h1:GQUN9bilAbhU/jgc1bKs99f/suXKeUMct8Adx5+Ntkg=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
@@ -63,11 +77,14 @@ github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UV
 github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
 github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
-github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
 github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
+github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
+github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
 github.com/subosito/gotenv v1.6.0 h1:9NlTDc1FTs4qu0DDq7AEtTPNw6SVm7uBMsUCUjABIf8=
 github.com/subosito/gotenv v1.6.0/go.mod h1:Dk4QP5c2W3ibzajGcXpNraDfq2IrhjMIvMSWPKKo0FU=
 github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
+go.etcd.io/bbolt v1.4.0 h1:TU77id3TnN/zKr7CO/uk+fBCwF2jGcMuw2B/FMAzYIk=
+go.etcd.io/bbolt v1.4.0/go.mod h1:AsD+OCi/qPN1giOX1aiLAha3o1U8rAz65bvN4j0sRuk=
 go.uber.org/atomic v1.9.0 h1:ECmE8Bn/WFTYwEW/bpKD3M8VtR/zQVbavAoalC1PYyE=
 go.uber.org/atomic v1.9.0/go.mod h1:fEN4uk6kAWBTFdckzkM89CLk9XfWZrxpCo0nPH17wJc=
 go.uber.org/multierr v1.9.0 h1:7fIwc/ZtS0q++VgcfqFDxSBZVv/Xo49/SYnDFupUwlI=
@@ -79,29 +96,47 @@ golang.org/x/crypto v0.28.0/go.mod h1:rmgy+3RHxRZMyY0jjAJShp2zgEdOqj2AO7U0pYmeQ7
 golang.org/x/exp v0.0.0-20230905200255-921286631fa9 h1:GoHiUyI/Tp2nVkLI2mCxVkOjsbSXD66ic0XW0js0R9g=
 golang.org/x/exp v0.0.0-20230905200255-921286631fa9/go.mod h1:S2oDrQGGwySpoQPVqRShND87VCbxmc6bL1Yd2oYrm6k=
 golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
+golang.org/x/mod v0.8.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
 golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
+golang.org/x/net v0.6.0/go.mod h1:2Tu9+aMcznHK/AK1HMvgo6xiTLG5rD5rZLDS+rp2Bjs=
+golang.org/x/net v0.9.0/go.mod h1:d48xBJpPfHeWQsugry2m+kC02ZBRGRgulfHnEXEuWns=
+golang.org/x/net v0.29.0 h1:5ORfpBpCs4HzDYoodCDBbwHzdR5UrLBZ3sOnUJmFoHo=
+golang.org/x/net v0.29.0/go.mod h1:gLkgy8jTGERgjzMic6DS9+SP0ajcu6Xu3Orq/SpETg0=
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 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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-golang.org/x/sys v0.26.0 h1:KHjCJyddX0LoSTb3J+vWpupP9p0oznkqVk/IfjymZbo=
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internal/bpm/bpm.go

@@ -0,0 +1,176 @@
+package bpm
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"regexp"
+	"strconv"
+	"strings"
+
+	"github.com/PuerkitoBio/goquery"
+)
+
+type Metrics struct {
+	BPM string
+	Key string
+}
+
+func FetchMetrics(ctx context.Context, httpClient *http.Client, artist, title, duration string) (*Metrics, error) {
+	url, err := findSongURL(ctx, httpClient, artist, title, duration)
+	if err != nil {
+		return nil, err
+	}
+
+	html, err := fetchPage(ctx, httpClient, url)
+	if err != nil {
+		return nil, err
+	}
+
+	return parseMetrics(html)
+}
+
+func findSongURL(ctx context.Context, httpClient *http.Client, artist, title, duration string) (string, error) {
+	rootUrl := "https://songbpm.com"
+	reqUrl := rootUrl + "/searches"
+
+	values := url.Values{}
+	values.Add("query", fmt.Sprintf("%s %s", artist, title))
+
+	req, err := http.NewRequestWithContext(ctx, "POST", reqUrl, bytes.NewBufferString(values.Encode()))
+	if err != nil {
+		return "", err
+	}
+	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+	req.Header.Set("Origin", "https://songbpm.com")
+
+	resp, err := httpClient.Do(req)
+	if err != nil {
+		return "", err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return "", fmt.Errorf("unexpected status code: %d", resp.StatusCode)
+	}
+
+	doc, err := goquery.NewDocumentFromReader(resp.Body)
+	if err != nil {
+		return "", err
+	}
+
+	var (
+		found bool
+		url   string
+	)
+
+	doc.Find("a.flex.flex-col").EachWithBreak(func(_ int, selection *goquery.Selection) bool {
+		lowerSelection := strings.ToLower(selection.Text())
+		lowerTitle := strings.ToLower(title)
+		lowerArtist := strings.ToLower(artist)
+		if !strings.Contains(lowerSelection, lowerTitle) || !strings.Contains(lowerSelection, lowerArtist) {
+			return true
+		}
+
+		durationStr := strings.TrimSpace(selection.Find("div.flex-1.flex-col.items-center").Eq(1).Find("span.text-2xl").Text())
+		parts := strings.Split(durationStr, ":")
+		if len(parts) != 2 {
+			return true
+		}
+		minutes, err := strconv.Atoi(parts[0])
+		if err != nil {
+			return true
+		}
+		seconds, err := strconv.Atoi(parts[1])
+		if err != nil {
+			return true
+		}
+
+		foundDuration := minutes*60 + seconds
+		duration, err := strconv.Atoi(duration)
+		if err != nil {
+			return true
+		}
+
+		if foundDuration <= (duration-2) || foundDuration >= (duration+2) {
+			return true
+		}
+
+		url = selection.AttrOr("href", "")
+		found = true
+
+		return false
+	})
+
+	if !found {
+		return "", fmt.Errorf("no data found")
+	}
+
+	return rootUrl + url, nil
+}
+
+func fetchPage(ctx context.Context, httpClient *http.Client, url string) (string, error) {
+	req, err := http.NewRequestWithContext(ctx, "GET", url, nil)
+	if err != nil {
+		return "", err
+	}
+
+	resp, err := httpClient.Do(req)
+	if err != nil {
+		return "", err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return "", fmt.Errorf("unexpected status code: %d", resp.StatusCode)
+	}
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return "", err
+	}
+
+	return string(body), nil
+}
+
+func parseMetrics(html string) (*Metrics, error) {
+	bpmRegex := regexp.MustCompile(`tempo of <span[^>]*>(\d+) BPM`)
+	bpmMatch := bpmRegex.FindStringSubmatch(html)
+
+	keyRegex := regexp.MustCompile(`with a <span[^>]*>([A-G](?:♯|#|♭|b)?(?:/[A-G](?:♯|#|♭|b)?)?)</span> key`)
+	keyMatch := keyRegex.FindStringSubmatch(html)
+
+	modeRegex := regexp.MustCompile(`a  <span[^>]*>([a-z]+)</span> mode`)
+	modeMatch := modeRegex.FindStringSubmatch(html)
+
+	if len(bpmMatch) != 2 || len(keyMatch) != 2 || len(modeMatch) != 2 {
+		return nil, fmt.Errorf("no data found")
+	}
+
+	isMinor := false
+	bpm := bpmMatch[1]
+	key := keyMatch[1]
+	if modeMatch[1] == "minor" {
+		isMinor = true
+	}
+
+	if strings.Contains(key, "/") {
+		parts := strings.Split(key, "/")
+		key = parts[0]
+	}
+
+	key = strings.ReplaceAll(key, "♯", "#")
+	key = strings.ReplaceAll(key, "♭", "b")
+
+	if isMinor && !strings.HasSuffix(key, "m") {
+		key += "m"
+	}
+
+	return &Metrics{
+		BPM: bpm,
+		Key: key,
+	}, nil
+}

internal/config/config.go

@@ -1,10 +1,82 @@
 package config
 
+import (
+	"fmt"
+	"os"
+	"path"
+	"path/filepath"
+
+	"github.com/mathismqn/godeez/internal/fileutil"
+	"github.com/mathismqn/godeez/internal/store"
+	"github.com/spf13/viper"
+)
+
 type Config struct {
-	LicenseToken string `mapstructure:"license_token"`
+	ArlCookie string `mapstructure:"arl_cookie"`
-	ArlCookie    string `mapstructure:"arl_cookie"`
+	SecretKey string `mapstructure:"secret_key"`
-	SecretKey    string `mapstructure:"secret_key"`
+	OutputDir string `mapstructure:"output_dir"`
-	IV           string `mapstructure:"iv"`
 }
 
-var Cfg Config
+func New(cfgPath string) (*Config, error) {
+	homeDir, err := os.UserHomeDir()
+	if err != nil {
+		return nil, fmt.Errorf("failed to get home directory: %w", err)
+	}
+
+	cfgDir := filepath.Join(homeDir, ".godeez")
+	if err := fileutil.EnsureDir(cfgDir); err != nil {
+		return nil, fmt.Errorf("failed to create config directory: %w", err)
+	}
+
+	if cfgPath == "" {
+		cfgPath = path.Join(cfgDir, "config.toml")
+		if _, err := os.Stat(cfgPath); os.IsNotExist(err) {
+			fmt.Printf("Config file not found, creating one at %s\n", cfgPath)
+
+			content := []byte("arl_cookie = ''\nsecret_key = ''\noutput_dir = ''\n")
+			if err := os.WriteFile(cfgPath, content, 0644); err != nil {
+				return nil, fmt.Errorf("failed to create config file: %w", err)
+			}
+
+			os.Exit(0)
+		}
+	}
+
+	viper.SetConfigFile(cfgPath)
+	viper.SetConfigType("toml")
+	viper.AutomaticEnv()
+	if err := viper.ReadInConfig(); err != nil {
+		return nil, fmt.Errorf("failed to read config file: %w", err)
+	}
+
+	var cfg Config
+	if err := viper.Unmarshal(&cfg); err != nil {
+		return nil, fmt.Errorf("failed to parse config: %w", err)
+	}
+	if err := cfg.Validate(homeDir); err != nil {
+		return nil, fmt.Errorf("invalid config: %w", err)
+	}
+
+	if err := store.OpenDB(cfgDir); err != nil {
+		return nil, err
+	}
+
+	return &cfg, nil
+}
+
+func (c *Config) Validate(homeDir string) error {
+	if c.ArlCookie == "" {
+		return fmt.Errorf("arl_cookie is not set")
+	}
+	if c.SecretKey == "" {
+		return fmt.Errorf("secret_key is not set")
+	}
+	if len(c.SecretKey) != 16 {
+		return fmt.Errorf("secret_key must be 16 bytes long")
+	}
+	if c.OutputDir == "" {
+		c.OutputDir = filepath.Join(homeDir, "Music", "GoDeez")
+	}
+
+	return nil
+}

internal/crypto/blowfish.go

@@ -3,18 +3,18 @@ package crypto
 import (
 	"crypto/cipher"
 	"crypto/md5"
-	"encoding/hex"
 	"fmt"
 
-	"github.com/mathismqn/godeez/internal/config"
 	"golang.org/x/crypto/blowfish"
 )
 
-func GetBlowfishKey(songID string) []byte {
+var iv = []byte{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07}
+
+func GetKey(secretKey, songID string) []byte {
 	hash := md5.Sum([]byte(songID))
 	hashHex := fmt.Sprintf("%x", hash)
 
-	key := []byte(config.Cfg.SecretKey)
+	key := []byte(secretKey)
 	for i := 0; i < len(hash); i++ {
 		key[i] = key[i] ^ hashHex[i] ^ hashHex[i+16]
 	}
@@ -22,17 +22,12 @@ func GetBlowfishKey(songID string) []byte {
 	return key
 }
 
-func DecryptBlowfish(data, key []byte) ([]byte, error) {
+func Decrypt(data, key []byte) ([]byte, error) {
 	block, err := blowfish.NewCipher(key)
 	if err != nil {
 		return nil, err
 	}
 
-	iv, err := hex.DecodeString(config.Cfg.IV)
-	if err != nil {
-		return nil, err
-	}
-
 	mode := cipher.NewCBCDecrypter(block, iv)
 	decrypted := make([]byte, len(data))
 	mode.CryptBlocks(decrypted, data)

internal/deezer/album.go

@@ -4,45 +4,69 @@ import (
 	"encoding/json"
 	"fmt"
 	"path"
+	"strconv"
+	"time"
 
 	"github.com/flytam/filenamify"
 )
 
 type Album struct {
-	Data struct {
+	Results struct {
-		Title               string `json:"ALB_TITLE"`
+		Data struct {
-		Artist              string `json:"ART_NAME"`
+			Title               string `json:"ALB_TITLE"`
-		OriginalReleaseDate string `json:"ORIGINAL_RELEASE_DATE"`
+			Artist              string `json:"ART_NAME"`
-		PhysicalReleaseDate string `json:"PHYSICAL_RELEASE_DATE"`
+			OriginalReleaseDate string `json:"ORIGINAL_RELEASE_DATE"`
-		Label               string `json:"LABEL_NAME"`
+			PhysicalReleaseDate string `json:"PHYSICAL_RELEASE_DATE"`
-		ProducerLine        string `json:"PRODUCER_LINE"`
+			Label               string `json:"LABEL_NAME"`
-	} `json:"DATA"`
+			ProducerLine        string `json:"PRODUCER_LINE"`
-	Songs struct {
+			Duration            string `json:"DURATION"`
-		Data []*Song `json:"data"`
+		} `json:"DATA"`
-	} `json:"SONGS"`
+		Songs struct {
+			Data []*Song `json:"data"`
+		} `json:"SONGS"`
+	} `json:"results"`
 }
 
-func (a *Album) GetURL(id string) string {
+func (a *Album) String() string {
-	return "https://www.deezer.com/en/album/" + id
+	duration, err := strconv.Atoi(a.Results.Data.Duration)
+	if err != nil {
+		duration = 0
+	}
+
+	return fmt.Sprintf(
+		`================= [ Album Info ] =================
+Title:    %s
+Artist:   %s
+Tracks:   %d
+Duration: %s
+==================================================`,
+		a.Results.Data.Title,
+		a.Results.Data.Artist,
+		len(a.Results.Songs.Data),
+		time.Duration(duration)*time.Second,
+	)
 }
 
-func (a *Album) UnmarshalData(data []byte) error {
+func (a *Album) GetType() string {
-	return json.Unmarshal(data, a)
+	return "Album"
-}
-
-func (a *Album) GetSongs() []*Song {
-	return a.Songs.Data
-}
-
-func (a *Album) GetOutputPath(outputDir string) string {
-	base := fmt.Sprintf("%s - %s", a.Data.Artist, a.Data.Title)
-	base, _ = filenamify.Filenamify(base, filenamify.Options{})
-	outputPath := path.Join(outputDir, base)
-	outputPath, _ = filenamify.Filenamify(outputPath, filenamify.Options{})
-
-	return outputPath
 }
 
 func (a *Album) GetTitle() string {
-	return a.Data.Title
+	return a.Results.Data.Title
+}
+
+func (a *Album) GetSongs() []*Song {
+	return a.Results.Songs.Data
+}
+
+func (a *Album) GetOutputDir(outputDir string) string {
+	base := fmt.Sprintf("%s - %s", a.Results.Data.Artist, a.Results.Data.Title)
+	base, _ = filenamify.Filenamify(base, filenamify.Options{})
+	outputDir = path.Join(outputDir, base)
+
+	return outputDir
+}
+
+func (a *Album) Unmarshal(data []byte) error {
+	return json.Unmarshal(data, a)
 }

internal/deezer/client.go

@@ -0,0 +1,185 @@
+package deezer
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"strings"
+
+	"github.com/mathismqn/godeez/internal/config"
+)
+
+type Client struct {
+	AppConfig *config.Config
+	Session   *Session
+}
+
+func NewClient(ctx context.Context, appConfig *config.Config) (*Client, error) {
+	session, err := Authenticate(ctx, appConfig.ArlCookie)
+	if err != nil {
+		return nil, fmt.Errorf("failed to authenticate: %w", err)
+	}
+
+	return &Client{
+		AppConfig: appConfig,
+		Session:   session,
+	}, nil
+}
+
+func (c *Client) FetchResource(ctx context.Context, ressource Resource, id string) error {
+	payload := map[string]interface{}{
+		"nb":          10000,
+		"start":       0,
+		"playlist_id": id,
+		"alb_id":      id,
+		"lang":        "en",
+		"tab":         0,
+		"tags":        true,
+		"header":      true,
+	}
+	jsonData, err := json.Marshal(payload)
+	if err != nil {
+		return err
+	}
+
+	url := fmt.Sprintf("https://www.deezer.com/ajax/gw-light.php?method=deezer.page%s&input=3&api_version=1.0&api_token=%s", ressource.GetType(), c.Session.APIToken)
+	req, err := http.NewRequestWithContext(ctx, "POST", url, bytes.NewBuffer(jsonData))
+	if err != nil {
+		return err
+	}
+
+	resp, err := c.Session.HttpClient.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return fmt.Errorf("unexpected status code: %d", resp.StatusCode)
+	}
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return err
+	}
+
+	if strings.Contains(string(body), `"DATA_ERROR":"playlist::getData"`) {
+		return fmt.Errorf("invalid playlist ID")
+	}
+	if strings.Contains(string(body), `"DATA_ERROR":"album::getData"`) {
+		return fmt.Errorf("invalid album ID")
+	}
+	if strings.Contains(string(body), `"results":{}`) {
+		return fmt.Errorf("unexpected response")
+	}
+
+	return ressource.Unmarshal(body)
+}
+
+func (c *Client) FetchMedia(ctx context.Context, song *Song, quality string) (*Media, error) {
+	var formats string
+
+	switch quality {
+	case "mp3_128":
+		formats = `[{"cipher":"BF_CBC_STRIPE","format":"MP3_128"}]`
+	case "mp3_320":
+		formats = `[{"cipher":"BF_CBC_STRIPE","format":"MP3_320"}]`
+	case "flac":
+		formats = `[{"cipher":"BF_CBC_STRIPE","format":"FLAC"}]`
+	case "best":
+		formats = `[{"cipher":"BF_CBC_STRIPE","format":"FLAC"},{"cipher":"BF_CBC_STRIPE","format":"MP3_320"},{"cipher":"BF_CBC_STRIPE","format":"MP3_128"}]`
+	}
+
+	reqBody := fmt.Sprintf(`{"license_token":"%s","media":[{"type":"FULL","formats":%s}],"track_tokens":["%s"]}`, c.Session.LicenseToken, formats, song.TrackToken)
+	req, err := http.NewRequestWithContext(ctx, "POST", "https://media.deezer.com/v1/get_url", bytes.NewBuffer([]byte(reqBody)))
+	if err != nil {
+		return nil, err
+	}
+
+	resp, err := c.Session.HttpClient.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK && resp.StatusCode != http.StatusBadRequest {
+		return nil, fmt.Errorf("unexpected status code: %d", resp.StatusCode)
+	}
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	var media Media
+	err = json.Unmarshal(body, &media)
+	if err != nil {
+		return nil, err
+	}
+
+	if len(media.Errors) > 0 {
+		if media.Errors[0].Code == 1000 {
+			return nil, fmt.Errorf("invalid license token")
+		}
+
+		return nil, fmt.Errorf("%s", media.Errors[0].Message)
+	}
+	if len(media.Data) > 0 && len(media.Data[0].Errors) > 0 {
+		if media.Data[0].Errors[0].Code == 2002 {
+			return nil, fmt.Errorf("invalid track token")
+		}
+
+		return nil, fmt.Errorf("%s", media.Data[0].Errors[0].Message)
+	}
+
+	return &media, nil
+}
+
+func (c *Client) FetchCoverImage(ctx context.Context, song *Song) ([]byte, error) {
+	url := fmt.Sprintf("https://e-cdn-images.dzcdn.net/images/cover/%s/500x500-000000-80-0-0.jpg", song.Cover)
+	req, err := http.NewRequestWithContext(ctx, "GET", url, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	resp, err := c.Session.HttpClient.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("unexpected status code: %d", resp.StatusCode)
+	}
+
+	return io.ReadAll(resp.Body)
+}
+
+func (c *Client) GetMediaStream(ctx context.Context, media *Media, songID string) (io.ReadCloser, error) {
+	url, err := media.GetURL()
+	if err != nil {
+		return nil, err
+	}
+
+	req, err := http.NewRequestWithContext(ctx, "GET", url, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	streamingClient := *c.Session.HttpClient
+	streamingClient.Timeout = 0
+
+	resp, err := streamingClient.Do(req)
+	if err != nil {
+		return nil, err
+	}
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("unexpected status code: %d", resp.StatusCode)
+	}
+
+	return resp.Body, nil
+}

internal/deezer/media.go

@@ -2,10 +2,6 @@ package deezer
 
 import (
 	"fmt"
-	"net/http"
-	"os"
-
-	"github.com/mathismqn/godeez/internal/crypto"
 )
 
 type Media struct {
@@ -35,64 +31,26 @@ type Source struct {
 	Provider string `json:"provider"`
 }
 
-const ChunkSize = 2048
+func (m *Media) GetURL() (string, error) {
-
+	if len(m.Data) == 0 || len(m.Data[0].Media) == 0 || len(m.Data[0].Media[0].Sources) == 0 {
-func (m *Media) Download(url, path, songID string) error {
+		return "", fmt.Errorf("no media sources found")
-	resp, err := http.Get(url)
-	if err != nil {
-		return err
-	}
-	defer resp.Body.Close()
-
-	if resp.StatusCode != http.StatusOK {
-		return fmt.Errorf("unexpected status code: %d", resp.StatusCode)
 	}
 
-	file, err := os.Create(path)
+	url := m.Data[0].Media[0].Sources[0].URL
-	if err != nil {
+	for _, source := range m.Data[0].Media[0].Sources {
-		return err
+		if source.Provider == "ak" {
-	}
+			url = source.URL
-	defer file.Close()
-
-	key := crypto.GetBlowfishKey(songID)
-	buffer := make([]byte, ChunkSize)
-
-	for chunk := 0; ; chunk++ {
-		totalRead := 0
-		for totalRead < ChunkSize {
-			n, err := resp.Body.Read(buffer[totalRead:])
-			if err != nil {
-				if err.Error() == "EOF" {
-					break
-				}
-				return err
-			}
-
-			if n > 0 {
-				totalRead += n
-			}
-		}
-
-		if totalRead == 0 {
-			break
-		}
-
-		if chunk%3 == 0 && totalRead == ChunkSize {
-			buffer, err = crypto.DecryptBlowfish(buffer, key)
-			if err != nil {
-				return err
-			}
-		}
-
-		_, err = file.Write(buffer[:totalRead])
-		if err != nil {
-			return err
-		}
-
-		if totalRead < ChunkSize {
 			break
 		}
 	}
 
-	return nil
+	return url, nil
+}
+
+func (m *Media) GetFormat() (string, error) {
+	if len(m.Data) == 0 || len(m.Data[0].Media) == 0 {
+		return "", fmt.Errorf("no media format found")
+	}
+
+	return m.Data[0].Media[0].Format, nil
 }

internal/deezer/playlist.go

@@ -2,42 +2,61 @@ package deezer
 
 import (
 	"encoding/json"
+	"fmt"
 	"path"
+	"time"
 
 	"github.com/flytam/filenamify"
 )
 
 type Playlist struct {
-	Data struct {
+	Results struct {
-		Title     string `json:"TITLE"`
+		Data struct {
-		Status    int    `json:"STATUS"`
+			Title    string `json:"TITLE"`
-		CollabKey string `json:"COLLAB_KEY"`
+			Status   int    `json:"STATUS"`
-	} `json:"DATA"`
+			Creator  string `json:"PARENT_USERNAME"`
-	Songs struct {
+			Duration int    `json:"DURATION"`
-		Data []*Song `json:"data"`
+		} `json:"DATA"`
-	} `json:"SONGS"`
+		Songs struct {
+			Data []*Song `json:"data"`
+		} `json:"SONGS"`
+	} `json:"results"`
 }
 
-func (p *Playlist) GetURL(id string) string {
+func (p *Playlist) String() string {
-	return "https://www.deezer.com/en/playlist/" + id
+	return fmt.Sprintf(
+		`=============== [ Playlist Info ] ===============
+Title:    %s
+Creator:  %s
+Tracks:   %d
+Duration: %s
+=================================================`,
+		p.Results.Data.Title,
+		p.Results.Data.Creator,
+		len(p.Results.Songs.Data),
+		time.Duration(p.Results.Data.Duration)*time.Second,
+	)
 }
 
-func (p *Playlist) UnmarshalData(data []byte) error {
+func (p *Playlist) GetType() string {
-	return json.Unmarshal(data, p)
+	return "Playlist"
-}
-
-func (p *Playlist) GetSongs() []*Song {
-	return p.Songs.Data
-}
-
-func (p *Playlist) GetOutputPath(outputDir string) string {
-	p.Data.Title, _ = filenamify.Filenamify(p.Data.Title, filenamify.Options{})
-	outputPath := path.Join(outputDir, p.Data.Title)
-	outputPath, _ = filenamify.Filenamify(outputPath, filenamify.Options{})
-
-	return outputPath
 }
 
 func (p *Playlist) GetTitle() string {
-	return p.Data.Title
+	return p.Results.Data.Title
+}
+
+func (p *Playlist) GetSongs() []*Song {
+	return p.Results.Songs.Data
+}
+
+func (p *Playlist) GetOutputDir(outputDir string) string {
+	p.Results.Data.Title, _ = filenamify.Filenamify(p.Results.Data.Title, filenamify.Options{})
+	outputDir = path.Join(outputDir, p.Results.Data.Title)
+
+	return outputDir
+}
+
+func (p *Playlist) Unmarshal(data []byte) error {
+	return json.Unmarshal(data, p)
 }

internal/deezer/resource.go

@@ -1,57 +1,9 @@
 package deezer
 
-import (
-	"fmt"
-	"io"
-	"net/http"
-	"regexp"
-
-	"github.com/mathismqn/godeez/internal/config"
-)
-
 type Resource interface {
-	GetURL(id string) string
-	UnmarshalData(data []byte) error
-	GetSongs() []*Song
-	GetOutputPath(outputDir string) string
 	GetTitle() string
-}
+	GetType() string
-
+	GetSongs() []*Song
-func GetData(r Resource, id string) error {
+	GetOutputDir(outputDir string) string
-	url := r.GetURL(id)
+	Unmarshal(data []byte) error
-
-	client := &http.Client{}
-	req, err := http.NewRequest("GET", url, nil)
-	if err != nil {
-		return err
-	}
-
-	if config.Cfg.ArlCookie != "" {
-		req.AddCookie(&http.Cookie{
-			Name:  "arl",
-			Value: config.Cfg.ArlCookie,
-		})
-	}
-
-	resp, err := client.Do(req)
-	if err != nil {
-		return err
-	}
-	defer resp.Body.Close()
-
-	if resp.StatusCode != http.StatusOK {
-		if resp.StatusCode == http.StatusNotFound {
-			return fmt.Errorf("resource not found")
-		}
-		return fmt.Errorf("unexpected status code: %d", resp.StatusCode)
-	}
-
-	body, _ := io.ReadAll(resp.Body)
-	re := regexp.MustCompile(`window\.__DZR_APP_STATE__ = (\{.*\})`)
-	matches := re.FindStringSubmatch(string(body))
-	if len(matches) != 2 {
-		return fmt.Errorf("error parsing response")
-	}
-
-	return r.UnmarshalData([]byte(matches[1]))
 }

internal/deezer/session.go

@@ -0,0 +1,89 @@
+package deezer
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/http/cookiejar"
+	"time"
+)
+
+type UserDataResponse struct {
+	Results struct {
+		APIToken string `json:"checkForm"`
+		User     struct {
+			Id      int `json:"USER_ID"`
+			Options struct {
+				LicenseToken  string `json:"license_token"`
+				MobileOffline bool   `json:"mobile_offline"`
+				WebOffline    bool   `json:"web_offline"`
+			} `json:"OPTIONS"`
+		} `json:"USER"`
+	} `json:"results"`
+}
+
+type Session struct {
+	ArlCookie    string
+	APIToken     string
+	LicenseToken string
+	HttpClient   *http.Client
+	Premium      bool
+}
+
+func Authenticate(ctx context.Context, arlCookie string) (*Session, error) {
+	jar, err := cookiejar.New(nil)
+	if err != nil {
+		return nil, err
+	}
+	client := &http.Client{
+		Timeout: 20 * time.Second,
+		Jar:     jar,
+	}
+
+	url := "https://www.deezer.com/ajax/gw-light.php?method=deezer.getUserData&input=3&api_version=1.0&api_token="
+	req, err := http.NewRequestWithContext(ctx, "GET", url, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	req.AddCookie(&http.Cookie{
+		Name:  "arl",
+		Value: arlCookie,
+	})
+
+	resp, err := client.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("unexpected status code: %d", resp.StatusCode)
+	}
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	var res UserDataResponse
+	if err := json.Unmarshal(body, &res); err != nil {
+		return nil, err
+	}
+
+	if res.Results.User.Id == 0 {
+		return nil, fmt.Errorf("invalid arl cookie")
+	}
+
+	isPremium := res.Results.User.Options.MobileOffline || res.Results.User.Options.WebOffline
+
+	return &Session{
+		ArlCookie:    arlCookie,
+		APIToken:     res.Results.APIToken,
+		LicenseToken: res.Results.User.Options.LicenseToken,
+		HttpClient:   client,
+		Premium:      isPremium,
+	}, nil
+}

internal/deezer/song.go

@@ -1,13 +1,9 @@
 package deezer
 
 import (
-	"bytes"
-	"encoding/json"
 	"fmt"
-	"io"
-	"net/http"
 
-	"github.com/mathismqn/godeez/internal/config"
+	"github.com/flytam/filenamify"
 )
 
 type Song struct {
@@ -28,68 +24,27 @@ type Song struct {
 	TrackToken  string `json:"TRACK_TOKEN"`
 }
 
-func (s *Song) GetMediaData(quality string) (*Media, error) {
+func (s *Song) GetTitle() string {
-	var formats string
+	songTitle := s.Title
-
+	if s.Version != "" {
-	switch quality {
+		songTitle = fmt.Sprintf("%s %s", s.Title, s.Version)
-	case "mp3_128":
-		formats = `[{"cipher":"BF_CBC_STRIPE","format":"MP3_128"}]`
-	case "mp3_320":
-		formats = `[{"cipher":"BF_CBC_STRIPE","format":"MP3_320"}]`
-	case "flac":
-		formats = `[{"cipher":"BF_CBC_STRIPE","format":"FLAC"}]`
-	case "best":
-		formats = `[{"cipher":"BF_CBC_STRIPE","format":"FLAC"},{"cipher":"BF_CBC_STRIPE","format":"MP3_320"},{"cipher":"BF_CBC_STRIPE","format":"MP3_128"}]`
 	}
 
-	reqBody := fmt.Sprintf(`{"license_token":"%s","media":[{"type":"FULL","formats":%s}],"track_tokens":["%s"]}`, config.Cfg.LicenseToken, formats, s.TrackToken)
+	return songTitle
-	resp, err := http.Post("https://media.deezer.com/v1/get_url", "application/json", bytes.NewBuffer([]byte(reqBody)))
-	if err != nil {
-		return nil, err
-	}
-	defer resp.Body.Close()
-
-	if resp.StatusCode != http.StatusOK && resp.StatusCode != http.StatusBadRequest {
-		return nil, fmt.Errorf("unexpected status code: %d", resp.StatusCode)
-	}
-
-	body, _ := io.ReadAll(resp.Body)
-
-	var media Media
-	err = json.Unmarshal(body, &media)
-	if err != nil {
-		return nil, err
-	}
-
-	if len(media.Errors) > 0 {
-		if media.Errors[0].Code == 1000 {
-			return nil, fmt.Errorf("invalid license token")
-		}
-
-		return nil, fmt.Errorf("%s", media.Errors[0].Message)
-	}
-	if len(media.Data) > 0 && len(media.Data[0].Errors) > 0 {
-		if media.Data[0].Errors[0].Code == 2002 {
-			return nil, fmt.Errorf("invalid track token")
-		}
-
-		return nil, fmt.Errorf("%s", media.Data[0].Errors[0].Message)
-	}
-
-	return &media, nil
 }
 
-func (s *Song) GetCoverImage() ([]byte, error) {
+func (s *Song) GetFileName(resourceType string, song *Song, media *Media) string {
-	url := fmt.Sprintf("https://e-cdn-images.dzcdn.net/images/cover/%s/500x500-000000-80-0-0.jpg", s.Cover)
+	ext := "mp3"
-	resp, err := http.Get(url)
+	if media.Data[0].Media[0].Format == "FLAC" {
-	if err != nil {
+		ext = "flac"
-		return nil, err
 	}
-	defer resp.Body.Close()
+	trackNumber := ""
-
+	if resourceType == "album" {
-	if resp.StatusCode != http.StatusOK {
+		trackNumber = song.TrackNumber + ". "
-		return nil, fmt.Errorf("unexpected status code: %d", resp.StatusCode)
 	}
 
-	return io.ReadAll(resp.Body)
+	fileName := fmt.Sprintf("%s%s - %s.%s", trackNumber, s.Artist, s.GetTitle(), ext)
+	fileName, _ = filenamify.Filenamify(fileName, filenamify.Options{})
+
+	return fileName
 }

internal/downloader/client.go

@@ -0,0 +1,311 @@
+package downloader
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"path"
+	"sync"
+	"time"
+
+	"github.com/briandowns/spinner"
+	"github.com/mathismqn/godeez/internal/bpm"
+	"github.com/mathismqn/godeez/internal/config"
+	"github.com/mathismqn/godeez/internal/crypto"
+	"github.com/mathismqn/godeez/internal/deezer"
+	"github.com/mathismqn/godeez/internal/fileutil"
+	"github.com/mathismqn/godeez/internal/store"
+	"github.com/mathismqn/godeez/internal/tags"
+)
+
+const chunkSize = 2048
+
+type Client struct {
+	appConfig    *config.Config
+	resourceType string
+	deezerClient *deezer.Client
+
+	hashIndexOnce sync.Once
+	hashIndex     *fileutil.HashIndex
+	hashIndexErr  error
+}
+
+func New(appConfig *config.Config, resourceType string) *Client {
+	return &Client{
+		appConfig:    appConfig,
+		resourceType: resourceType,
+		deezerClient: nil,
+	}
+}
+
+func (c *Client) Run(ctx context.Context, opts Options, id string) error {
+	var err error
+	c.deezerClient, err = deezer.NewClient(ctx, c.appConfig)
+	if err != nil {
+		return err
+	}
+
+	if !c.deezerClient.Session.Premium && (opts.Quality == "mp3_320" || opts.Quality == "flac") {
+		return fmt.Errorf("premium account required for %s quality", opts.Quality)
+	}
+
+	var resource deezer.Resource
+	switch c.resourceType {
+	case "album":
+		resource = &deezer.Album{}
+	case "playlist":
+		resource = &deezer.Playlist{}
+	default:
+		return fmt.Errorf("unsupported resource type: %s", c.resourceType)
+	}
+
+	if err := c.deezerClient.FetchResource(ctx, resource, id); err != nil {
+		return fmt.Errorf("failed to fetch resource: %w", err)
+	}
+
+	songs := resource.GetSongs()
+	if len(songs) == 0 {
+		return fmt.Errorf("%s has no songs", c.resourceType)
+	}
+
+	rootOutputDir := c.appConfig.OutputDir
+	resourceOutputDir := resource.GetOutputDir(rootOutputDir)
+	if err := fileutil.EnsureDir(resourceOutputDir); err != nil {
+		return fmt.Errorf("failed to create output directory: %w", err)
+	}
+
+	startTime := time.Now()
+	fmt.Printf("%s\n\nStarting download...\n\n", resource)
+
+	downloaded := 0
+	skipped := 0
+	failed := 0
+
+	for i, song := range songs {
+		if ctx.Err() != nil {
+			return ctx.Err()
+		}
+
+		trackProgress := fmt.Sprintf("[%d/%d]", i+1, len(songs))
+
+		sp := spinner.New(spinner.CharSets[14], 100*time.Millisecond)
+		sp.Writer = os.Stdout
+		sp.Prefix = trackProgress + " "
+		sp.Suffix = fmt.Sprintf(" Downloading: %s - %s", song.Artist, song.Title)
+		sp.Start()
+
+		warnings, err := c.downloadSong(ctx, resource, song, opts, resourceOutputDir)
+		sp.Stop()
+
+		if err != nil {
+			if errors.Is(err, context.Canceled) {
+				return err
+			}
+
+			if path, ok := IsSkipError(err); ok {
+				skipped++
+				fmt.Printf("%s ↷ Skipped: %s - %s\n    Already exists at: %s\n", trackProgress, song.Artist, song.Title, path)
+				continue
+			}
+
+			failed++
+			fmt.Printf("%s ✖ Failed: %s - %s:\n    Error: %v\n", trackProgress, song.Artist, song.Title, err)
+			continue
+		}
+
+		symbol := "✔"
+		if len(warnings) > 0 {
+			symbol = "⚠"
+		}
+
+		downloaded++
+		fmt.Printf("%s %s Downloaded: %s - %s\n", trackProgress, symbol, song.Artist, song.Title)
+		for _, w := range warnings {
+			fmt.Printf("    Warning: %s\n", w)
+		}
+	}
+
+	fmt.Printf(`
+================== [ Summary ] ==================
+Downloaded:     %d
+Skipped:        %d
+Failed:         %d
+Elapsed time:   %s
+Files saved to: %s
+=================================================
+`,
+		downloaded,
+		skipped,
+		failed,
+		time.Since(startTime).Round(time.Second),
+		resourceOutputDir,
+	)
+
+	return nil
+}
+
+func (c *Client) downloadSong(ctx context.Context, resource deezer.Resource, song *deezer.Song, opts Options, outputDir string) ([]string, error) {
+	var warnings []string
+
+	media, err := c.deezerClient.FetchMedia(ctx, song, opts.Quality)
+	if err != nil {
+		return warnings, fmt.Errorf("failed to fetch media: %w", err)
+	}
+
+	fileName := song.GetFileName(c.resourceType, song, media)
+	outputPath := path.Join(outputDir, fileName)
+
+	mediaFormat, err := media.GetFormat()
+	if err != nil {
+		return warnings, fmt.Errorf("failed to get media format: %w", err)
+	}
+
+	if path, skip := c.shouldSkipDownload(ctx, song.ID, mediaFormat); skip {
+		return warnings, SkipError{Path: path}
+	}
+
+	var metricsChan chan *bpm.Metrics
+	var errChan chan error
+	if opts.BPM {
+		metricsChan = make(chan *bpm.Metrics, 1)
+		errChan = make(chan error, 1)
+		go func() {
+			metrics, err := bpm.FetchMetrics(ctx, c.deezerClient.Session.HttpClient, song.Artist, song.Title, song.Duration)
+			if err != nil {
+				errChan <- err
+				return
+			}
+
+			metricsChan <- metrics
+		}()
+	}
+
+	stream, err := c.deezerClient.GetMediaStream(ctx, media, song.ID)
+	if err != nil {
+		return warnings, fmt.Errorf("failed to get media stream: %w", err)
+	}
+
+	dlCtx, cancel := context.WithTimeout(ctx, opts.Timeout)
+	defer cancel()
+
+	key := crypto.GetKey(c.appConfig.SecretKey, song.ID)
+	if err := c.streamToFile(dlCtx, stream, outputPath, key); err != nil {
+		fileutil.DeleteFile(outputPath)
+
+		return warnings, fmt.Errorf("failed to stream to file: %w", err)
+	}
+
+	metrics := &bpm.Metrics{}
+	if opts.BPM {
+		select {
+		case metrics = <-metricsChan:
+		case err := <-errChan:
+			if !errors.Is(err, context.Canceled) {
+				warnings = append(warnings, fmt.Sprintf("failed to fetch BPM and key: %v", err))
+			}
+		}
+	}
+
+	cover, err := c.deezerClient.FetchCoverImage(ctx, song)
+	if err != nil && !errors.Is(err, context.Canceled) {
+		warnings = append(warnings, fmt.Sprintf("failed to fetch cover image: %v", err))
+	}
+
+	warnings = append(warnings, c.finalizeDownload(resource, song, outputPath, mediaFormat, cover, metrics)...)
+
+	return warnings, nil
+}
+
+func (c *Client) streamToFile(ctx context.Context, stream io.ReadCloser, outputPath string, key []byte) error {
+	defer stream.Close()
+
+	file, err := os.Create(outputPath)
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+
+	buffer := make([]byte, chunkSize)
+	for chunk := 0; ; chunk++ {
+		select {
+		case <-ctx.Done():
+			return ctx.Err()
+		default:
+			// continue
+		}
+
+		totalRead := 0
+		for totalRead < chunkSize {
+			n, err := stream.Read(buffer[totalRead:])
+			if err != nil {
+				if errors.Is(err, io.EOF) {
+					break
+				}
+				return err
+			}
+
+			if n > 0 {
+				totalRead += n
+			}
+		}
+
+		if totalRead == 0 {
+			break
+		}
+
+		if chunk%3 == 0 && totalRead == chunkSize {
+			buffer, err = crypto.Decrypt(buffer, key)
+			if err != nil {
+				return err
+			}
+		}
+
+		_, err = file.Write(buffer[:totalRead])
+		if err != nil {
+			return err
+		}
+
+		if totalRead < chunkSize {
+			break
+		}
+	}
+
+	return nil
+}
+
+func (c *Client) finalizeDownload(resource deezer.Resource, song *deezer.Song, outputPath, mediaFormat string, cover []byte, metrics *bpm.Metrics) []string {
+	var warnings []string
+
+	if err := tags.AddTags(resource, song, cover, outputPath, metrics.BPM, metrics.Key); err != nil {
+		warnings = append(warnings, fmt.Sprintf("failed to add tags: %v", err))
+	}
+
+	hash, err := fileutil.GetFileHash(outputPath)
+	if err != nil {
+		warnings = append(warnings, fmt.Sprintf("failed to get file hash: %v", err))
+	}
+
+	info := &store.DownloadInfo{
+		SongID:     song.ID,
+		Quality:    mediaFormat,
+		Path:       outputPath,
+		Hash:       hash,
+		Downloaded: time.Now(),
+	}
+
+	if err := info.Save(); err != nil {
+		warnings = append(warnings, fmt.Sprintf("failed to save download info: %v", err))
+	}
+
+	return warnings
+}
+
+func (c *Client) initHashIndex(ctx context.Context) error {
+	c.hashIndexOnce.Do(func() {
+		c.hashIndex, c.hashIndexErr = fileutil.NewHashIndex(ctx, c.appConfig.OutputDir)
+	})
+
+	return c.hashIndexErr
+}

internal/downloader/options.go

@@ -0,0 +1,27 @@
+package downloader
+
+import (
+	"fmt"
+	"time"
+)
+
+var validQualities = map[string]bool{
+	"mp3_128": true,
+	"mp3_320": true,
+	"flac":    true,
+	"best":    true,
+}
+
+type Options struct {
+	Quality string
+	Timeout time.Duration
+	BPM     bool
+}
+
+func (o *Options) Validate() error {
+	if !validQualities[o.Quality] {
+		return fmt.Errorf("invalid quality option: %s", o.Quality)
+	}
+
+	return nil
+}

internal/downloader/skip.go

@@ -0,0 +1,43 @@
+package downloader
+
+import (
+	"context"
+
+	"github.com/mathismqn/godeez/internal/fileutil"
+	"github.com/mathismqn/godeez/internal/store"
+)
+
+type SkipError struct {
+	Path string
+}
+
+func (e SkipError) Error() string {
+	return e.Path
+}
+
+func IsSkipError(err error) (string, bool) {
+	if skipErr, ok := err.(SkipError); ok {
+		return skipErr.Path, true
+	}
+	return "", false
+}
+
+func (c *Client) shouldSkipDownload(ctx context.Context, songID, mediaFormat string) (string, bool) {
+	if existing, err := store.GetDownloadInfo(songID); err == nil && existing.Quality == mediaFormat {
+		if fileutil.FileExists(existing.Path) {
+			return existing.Path, true
+		}
+		if existing.Hash != "" {
+			if err := c.initHashIndex(ctx); err == nil {
+				if foundPath, ok := c.hashIndex.Find(existing.Hash); ok {
+					existing.Path = foundPath
+					_ = existing.Save()
+
+					return foundPath, true
+				}
+			}
+		}
+	}
+
+	return "", false
+}

internal/fileutil/file.go

@@ -0,0 +1,52 @@
+package fileutil
+
+import (
+	"crypto/sha256"
+	"fmt"
+	"io"
+	"os"
+)
+
+func EnsureDir(path string) error {
+	info, err := os.Stat(path)
+	if os.IsNotExist(err) {
+		return os.MkdirAll(path, 0755)
+	}
+	if err != nil {
+		return err
+	}
+	if !info.IsDir() {
+		return fmt.Errorf("file already exists at %s", path)
+	}
+
+	return nil
+}
+
+func FileExists(path string) bool {
+	info, err := os.Stat(path)
+
+	return err == nil && !info.IsDir()
+}
+
+func DeleteFile(path string) error {
+	if !FileExists(path) {
+		return nil
+	}
+
+	return os.Remove(path)
+}
+
+func GetFileHash(path string) (string, error) {
+	file, err := os.Open(path)
+	if err != nil {
+		return "", err
+	}
+	defer file.Close()
+
+	hash := sha256.New()
+	if _, err := io.Copy(hash, file); err != nil {
+		return "", err
+	}
+
+	return fmt.Sprintf("%x", hash.Sum(nil)), nil
+}

internal/fileutil/hashindex.go

@@ -0,0 +1,56 @@
+package fileutil
+
+import (
+	"context"
+	"crypto/sha256"
+	"encoding/hex"
+	"io"
+	"os"
+	"path/filepath"
+)
+
+type HashIndex struct {
+	files map[string]string
+}
+
+func NewHashIndex(ctx context.Context, root string) (*HashIndex, error) {
+	index := &HashIndex{files: make(map[string]string)}
+
+	err := filepath.Walk(root, func(path string, info os.FileInfo, err error) error {
+		if ctx.Err() != nil {
+			return ctx.Err()
+		}
+
+		if err != nil || info.IsDir() {
+			return nil
+		}
+
+		file, err := os.Open(path)
+		if err != nil {
+			return nil
+		}
+		defer file.Close()
+
+		h := sha256.New()
+		if _, err := io.Copy(h, file); err != nil {
+			return nil
+		}
+
+		sum := hex.EncodeToString(h.Sum(nil))
+		index.files[sum] = path
+
+		return nil
+	})
+
+	if err != nil {
+		return nil, err
+	}
+
+	return index, nil
+}
+
+func (h *HashIndex) Find(hash string) (string, bool) {
+	path, ok := h.files[hash]
+
+	return path, ok
+}

internal/store/download_info.go

@@ -0,0 +1,59 @@
+package store
+
+import (
+	"encoding/json"
+	"fmt"
+	"time"
+
+	"go.etcd.io/bbolt"
+)
+
+type DownloadInfo struct {
+	SongID     string    `json:"song_id"`
+	Quality    string    `json:"quality"`
+	Path       string    `json:"path"`
+	Hash       string    `json:"hash"`
+	Downloaded time.Time `json:"downloaded_at"`
+}
+
+func GetDownloadInfo(songID string) (*DownloadInfo, error) {
+	var info DownloadInfo
+
+	if err := db.View(func(tx *bbolt.Tx) error {
+		b := tx.Bucket(trackBucket)
+		if b == nil {
+			return fmt.Errorf("bucket not found")
+		}
+
+		data := b.Get([]byte(songID))
+		if data == nil {
+			return fmt.Errorf("not found")
+		}
+		return json.Unmarshal(data, &info)
+	}); err != nil {
+		return nil, err
+	}
+
+	return &info, nil
+}
+
+func (d *DownloadInfo) Save() error {
+	return db.Update(func(tx *bbolt.Tx) error {
+		b := tx.Bucket(trackBucket)
+		if b == nil {
+			return fmt.Errorf("bucket not found")
+		}
+
+		data, err := json.Marshal(d)
+		if err != nil {
+			return err
+		}
+
+		err = b.Put([]byte(d.SongID), data)
+		if err != nil {
+			return err
+		}
+
+		return nil
+	})
+}

internal/store/store.go

@@ -0,0 +1,32 @@
+package store
+
+import (
+	"fmt"
+	"path"
+
+	bolt "go.etcd.io/bbolt"
+)
+
+var (
+	db          *bolt.DB
+	trackBucket = []byte("tracks")
+)
+
+func OpenDB(cfgDir string) error {
+	var err error
+
+	dbPath := path.Join(cfgDir, "tracks.db")
+	db, err = bolt.Open(dbPath, 0600, nil)
+	if err != nil {
+		return fmt.Errorf("failed to open database: %w", err)
+	}
+
+	if err := db.Update(func(tx *bolt.Tx) error {
+		_, err := tx.CreateBucketIfNotExists(trackBucket)
+		return err
+	}); err != nil {
+		return fmt.Errorf("failed to create bucket: %w", err)
+	}
+
+	return nil
+}

internal/tags/flac.go

@@ -10,25 +10,25 @@ import (
 	"github.com/mathismqn/godeez/internal/deezer"
 )
 
-type FLACTagger struct {
+type flacTagger struct {
-	File  *flac.File
+	file  *flac.File
-	Cmts  *flacvorbis.MetaDataBlockVorbisComment
+	cmts  *flacvorbis.MetaDataBlockVorbisComment
-	Index int
+	index int
 }
 
-func (t *FLACTagger) AddTags(resource deezer.Resource, song *deezer.Song, cover []byte, path string) error {
+func (t *flacTagger) addTags(resource deezer.Resource, song *deezer.Song, cover []byte, path, tempo, key string) error {
 	if album, ok := resource.(*deezer.Album); ok {
-		dateParts := strings.Split(album.Data.PhysicalReleaseDate, "-")
+		dateParts := strings.Split(album.Results.Data.PhysicalReleaseDate, "-")
 		if len(dateParts) == 3 {
-			album.Data.PhysicalReleaseDate = dateParts[0]
+			album.Results.Data.PhysicalReleaseDate = dateParts[0]
 		}
 
-		t.addTag("ALBUM", album.Data.Title)
+		t.addTag("ALBUM", album.Results.Data.Title)
-		t.addTag("ALBUMARTIST", album.Data.Artist)
+		t.addTag("ALBUMARTIST", album.Results.Data.Artist)
-		t.addTag("PUBLISHER", album.Data.Label)
+		t.addTag("PUBLISHER", album.Results.Data.Label)
-		t.addTag("ORIGINALDATE", album.Data.OriginalReleaseDate)
+		t.addTag("ORIGINALDATE", album.Results.Data.OriginalReleaseDate)
-		t.addTag("DATE", album.Data.PhysicalReleaseDate)
+		t.addTag("DATE", album.Results.Data.PhysicalReleaseDate)
-		t.addTag("COMMENT", album.Data.ProducerLine)
+		t.addTag("COMMENT", album.Results.Data.ProducerLine)
 		t.addTag("TRACKNUMBER", song.TrackNumber)
 	}
 
@@ -39,11 +39,15 @@ func (t *FLACTagger) AddTags(resource deezer.Resource, song *deezer.Song, cover
 	t.addTag("REPLAYGAIN_TRACK_GAIN", song.Gain)
 	t.addTag("ISRC", song.ISRC)
 
-	cmtsmeta := t.Cmts.Marshal()
+	t.addTag("BPM", tempo)
-	if t.Index > 0 {
+	t.addTag("KEY", key)
-		t.File.Meta[t.Index] = &cmtsmeta
+	t.addTag("INITIALKEY", key)
+
+	cmtsmeta := t.cmts.Marshal()
+	if t.index > 0 {
+		t.file.Meta[t.index] = &cmtsmeta
 	} else {
-		t.File.Meta = append(t.File.Meta, &cmtsmeta)
+		t.file.Meta = append(t.file.Meta, &cmtsmeta)
 	}
 
 	picture, err := flacpicture.NewFromImageData(flacpicture.PictureTypeFrontCover, "Front cover", cover, "image/jpeg")
@@ -51,20 +55,20 @@ func (t *FLACTagger) AddTags(resource deezer.Resource, song *deezer.Song, cover
 		return err
 	}
 	picturemeta := picture.Marshal()
-	t.File.Meta = append(t.File.Meta, &picturemeta)
+	t.file.Meta = append(t.file.Meta, &picturemeta)
 
 	return t.saveTags(path)
 }
 
-func (t *FLACTagger) addTag(name, value string) {
+func (t *flacTagger) addTag(name, value string) {
 	if value != "" {
-		t.Cmts.Add(name, value)
+		t.cmts.Add(name, value)
 	}
 }
 
-func (t *FLACTagger) saveTags(path string) error {
+func (t *flacTagger) saveTags(path string) error {
 	tempPath := path + ".tmp"
-	t.File.Save(tempPath)
+	t.file.Save(tempPath)
 
 	return os.Rename(tempPath, path)
 }

internal/tags/id3v2.go

@@ -9,23 +9,26 @@ import (
 	"github.com/mathismqn/godeez/internal/deezer"
 )
 
-type ID3v2Tagger struct {
+type id3v2Tagger struct {
-	Tag *id3v2.Tag
+	tag *id3v2.Tag
 }
 
-func (t *ID3v2Tagger) AddTags(resource deezer.Resource, song *deezer.Song, cover []byte, path string) error {
+func (t *id3v2Tagger) addTags(resource deezer.Resource, song *deezer.Song, cover []byte, path, tempo, key string) error {
-	defer t.Tag.Close()
+	defer t.tag.Close()
 
-	duration, _ := strconv.Atoi(song.Duration)
+	duration, err := strconv.Atoi(song.Duration)
+	if err != nil {
+		return err
+	}
 	song.Duration = fmt.Sprintf("%d", duration*1000)
 
 	if album, ok := resource.(*deezer.Album); ok {
-		t.addTag("TALB", album.Data.Title)
+		t.addTag("TALB", album.Results.Data.Title)
-		t.addTag("TPE2", album.Data.Artist)
+		t.addTag("TPE2", album.Results.Data.Artist)
-		t.addTag("TPUB", album.Data.Label)
+		t.addTag("TPUB", album.Results.Data.Label)
-		t.addTag("TDOR", album.Data.OriginalReleaseDate)
+		t.addTag("TDOR", album.Results.Data.OriginalReleaseDate)
-		t.addTag("TYER", album.Data.PhysicalReleaseDate)
+		t.addTag("TYER", album.Results.Data.PhysicalReleaseDate)
-		t.addTag("COMM", album.Data.ProducerLine)
+		t.addTag("COMM", album.Results.Data.ProducerLine)
 		t.addTag("TRCK", song.TrackNumber)
 	}
 
@@ -37,31 +40,34 @@ func (t *ID3v2Tagger) AddTags(resource deezer.Resource, song *deezer.Song, cover
 	t.addTXXXTag("GAIN", song.Gain)
 	t.addTXXXTag("ISRC", song.ISRC)
 
+	t.addTag("TBPM", tempo)
+	t.addTag("TKEY", key)
+
 	frame := id3v2.PictureFrame{
-		Encoding:    t.Tag.DefaultEncoding(),
+		Encoding:    t.tag.DefaultEncoding(),
 		MimeType:    "image/jpeg",
 		PictureType: id3v2.PTFrontCover,
 		Description: "Cover",
 		Picture:     cover,
 	}
-	t.Tag.AddAttachedPicture(frame)
+	t.tag.AddAttachedPicture(frame)
 
-	return t.Tag.Save()
+	return t.tag.Save()
 }
 
-func (t *ID3v2Tagger) addTag(name, value string) {
+func (t *id3v2Tagger) addTag(name, value string) {
 	if value != "" {
-		t.Tag.AddTextFrame(name, t.Tag.DefaultEncoding(), value)
+		t.tag.AddTextFrame(name, t.tag.DefaultEncoding(), value)
 	}
 }
 
-func (t *ID3v2Tagger) addTXXXTag(description, value string) {
+func (t *id3v2Tagger) addTXXXTag(description, value string) {
 	if value != "" {
 		udf := id3v2.UserDefinedTextFrame{
-			Encoding:    t.Tag.DefaultEncoding(),
+			Encoding:    t.tag.DefaultEncoding(),
 			Description: description,
 			Value:       value,
 		}
-		t.Tag.AddUserDefinedTextFrame(udf)
+		t.tag.AddUserDefinedTextFrame(udf)
 	}
 }

internal/tags/tags.go

@@ -9,18 +9,19 @@ import (
 	"github.com/mathismqn/godeez/internal/deezer"
 )
 
-type Tagger interface {
+type tagger interface {
-	AddTags(resource deezer.Resource, song *deezer.Song, cover []byte, path string) error
+	addTags(resource deezer.Resource, song *deezer.Song, cover []byte, path, tempo, key string) error
 }
 
-func NewTagger(filePath string) (Tagger, error) {
+func newTagger(filePath string) (tagger, error) {
 	ext := path.Ext(filePath)
 	if ext == ".mp3" {
 		tag, err := id3v2.Open(filePath, id3v2.Options{Parse: true})
 		if err != nil {
 			return nil, err
 		}
-		return &ID3v2Tagger{Tag: tag}, nil
+
+		return &id3v2Tagger{tag: tag}, nil
 	}
 
 	file, err := flac.ParseFile(filePath)
@@ -35,18 +36,14 @@ func NewTagger(filePath string) (Tagger, error) {
 		cmts = flacvorbis.New()
 	}
 
-	return &FLACTagger{File: file, Cmts: cmts, Index: idx}, nil
+	return &flacTagger{file: file, cmts: cmts, index: idx}, nil
 }
 
-func AddTags(resource deezer.Resource, song *deezer.Song, filePath string) error {
+func AddTags(resource deezer.Resource, song *deezer.Song, cover []byte, filePath, tempo, key string) error {
-	tagger, err := NewTagger(filePath)
+	tagger, err := newTagger(filePath)
-	if err != nil {
-		return err
-	}
-	cover, err := song.GetCoverImage()
 	if err != nil {
 		return err
 	}
 
-	return tagger.AddTags(resource, song, cover, filePath)
+	return tagger.addTags(resource, song, cover, filePath, tempo, key)
 }

main.go

@@ -1,7 +1,16 @@
 package main
 
-import "github.com/mathismqn/godeez/cmd"
+import (
+	"context"
+	"os"
+	"os/signal"
+
+	"github.com/mathismqn/godeez/cmd"
+)
 
 func main() {
-	cmd.RootCmd.Execute()
+	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt)
+	defer stop()
+
+	cmd.RootCmd.ExecuteContext(ctx)
 }