package store

import (
	"os"
	"path/filepath"
	"testing"
)

func TestMigrate(t *testing.T) {
	tmpDir := t.TempDir()

	// Create old structure
	// WebDAV: files/<username>/
	if err := os.MkdirAll(filepath.Join(tmpDir, "files", "alice"), 0o755); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(filepath.Join(tmpDir, "files", "alice", "test.txt"), []byte("test"), 0o644); err != nil {
		t.Fatal(err)
	}

	// CalDAV: <username>/cal-<name>/
	if err := os.MkdirAll(filepath.Join(tmpDir, "bob", "cal-work"), 0o755); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(filepath.Join(tmpDir, "bob", "cal-work", "evt.ics"), []byte("calendar"), 0o644); err != nil {
		t.Fatal(err)
	}

	// CardDAV: <username>/card-<name>/
	if err := os.MkdirAll(filepath.Join(tmpDir, "bob", "card-contacts"), 0o755); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(filepath.Join(tmpDir, "bob", "card-contacts", "vcard.vcf"), []byte("card"), 0o644); err != nil {
		t.Fatal(err)
	}

	// Create store and migrate
	st, err := NewStore(tmpDir)
	if err != nil {
		t.Fatal(err)
	}

	if err := st.Migrate(); err != nil {
		t.Fatal(err)
	}

	// Verify WebDAV: <username>/files/
	if _, err := os.Stat(filepath.Join(tmpDir, "alice", "files", "test.txt")); err != nil {
		t.Errorf("alice files not migrated: %v", err)
	}

	// Verify CalDAV: <username>/calendars/<name>
	if _, err := os.Stat(filepath.Join(tmpDir, "bob", "calendars", "work", "evt.ics")); err != nil {
		t.Errorf("bob calendars not migrated: %v", err)
	}

	// Verify CardDAV: <username>/addressbooks/<name>
	if _, err := os.Stat(filepath.Join(tmpDir, "bob", "addressbooks", "contacts", "vcard.vcf")); err != nil {
		t.Errorf("bob addressbooks not migrated: %v", err)
	}

	// Verify old structure is gone
	if _, err := os.Stat(filepath.Join(tmpDir, "files", "alice")); err == nil {
		t.Error("old files directory not removed")
	}
	if _, err := os.Stat(filepath.Join(tmpDir, "bob", "cal-work")); err == nil {
		t.Error("old cal- directory not removed")
	}
	if _, err := os.Stat(filepath.Join(tmpDir, "bob", "card-contacts")); err == nil {
		t.Error("old card- directory not removed")
	}
}

func TestMigrateIdempotent(t *testing.T) {
	tmpDir := t.TempDir()

	// Create new structure
	if err := os.MkdirAll(filepath.Join(tmpDir, "alice", "files"), 0o755); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(filepath.Join(tmpDir, "alice", "files", "test.txt"), []byte("test"), 0o644); err != nil {
		t.Fatal(err)
	}

	st, err := NewStore(tmpDir)
	if err != nil {
		t.Fatal(err)
	}

	// Run migration twice
	if err := st.Migrate(); err != nil {
		t.Fatal(err)
	}
	if err := st.Migrate(); err != nil {
		t.Fatal(err)
	}

	// Verify data still there
	if _, err := os.Stat(filepath.Join(tmpDir, "alice", "files", "test.txt")); err != nil {
		t.Errorf("data not preserved: %v", err)
	}
}

func TestMigrateMissingDirectories(t *testing.T) {
	tmpDir := t.TempDir()

	st, err := NewStore(tmpDir)
	if err != nil {
		t.Fatal(err)
	}

	// Should not error on empty directory
	if err := st.Migrate(); err != nil {
		t.Errorf("unexpected error: %v", err)
	}
}