// Command migrate is a tool to restructure the data directory from the
// old format to the new unified format.
package main

import (
	"flag"
	"fmt"
	"log/slog"
	"os"

	"github.com/yourusername/caldav-server/internal/config"
	"github.com/yourusername/caldav-server/internal/store"
)

func main() {
	os.Exit(run(os.Args[1:]))
}

func run(args []string) int {
	fs := flag.NewFlagSet("migrate", flag.ContinueOnError)
	cfgPath := fs.String("config", "config.yaml", "path to configuration file")
	verbose := fs.Bool("verbose", false, "enable verbose output")
	if err := fs.Parse(args); err != nil {
		return 2
	}

	cfg, err := config.Load(*cfgPath)
	if err != nil {
		fmt.Fprintf(os.Stderr, "error loading config: %v\n", err)
		return 1
	}

	logger := buildLogger(*verbose)

	st, err := store.NewStore(cfg.Storage.DataDir)
	if err != nil {
		fmt.Fprintf(os.Stderr, "error opening store %q: %v\n", cfg.Storage.DataDir, err)
		return 1
	}

	logger.Info("starting migration", "data_dir", cfg.Storage.DataDir)

	if err := st.Migrate(); err != nil {
		logger.Error("migration failed", "error", err)
		fmt.Fprintf(os.Stderr, "migration failed: %v\n", err)
		return 1
	}

	logger.Info("migration completed successfully")
	fmt.Println("Migration completed successfully")
	return 0
}

func buildLogger(verbose bool) *slog.Logger {
	level := slog.LevelInfo
	if verbose {
		level = slog.LevelDebug
	}
	handler := slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{
		Level: level,
	})
	return slog.New(handler)
}