package database

import (
	"testing"
)

// TestNew_InitializationAndSchema verifies that New() creates all expected tables.
func TestNew_InitializationAndSchema(t *testing.T) {
	db, err := New(":memory:")
	if err != nil {
		t.Fatalf("New() error: %v", err)
	}
	defer db.Close()

	expectedTables := []string{
		"_migrations",
		"artist_settings",
		"external_releases",
		"local_albums",
		"notifications_sent",
	}

	for _, table := range expectedTables {
		var name string
		err := db.Conn().QueryRow(
			"SELECT name FROM sqlite_master WHERE type='table' AND name=?", table,
		).Scan(&name)
		if err != nil {
			t.Errorf("expected table %q to exist, got error: %v", table, err)
		}
	}
}

// TestNew_MigrationIdempency verifies that calling New() twice (via migrate) does not fail.
func TestNew_MigrationIdempotency(t *testing.T) {
	db, err := New(":memory:")
	if err != nil {
		t.Fatalf("first New() error: %v", err)
	}

	// Running migrate again on the same connection should be a no-op.
	err = db.migrate()
	if err != nil {
		t.Fatalf("second migrate() error: %v", err)
	}

	// Verify tables still exist.
	var count int
	err = db.Conn().QueryRow(
		"SELECT COUNT(*) FROM sqlite_master WHERE type='table' AND name IN (?,?,?,?,?)",
		"_migrations", "artist_settings", "external_releases", "local_albums", "notifications_sent",
	).Scan(&count)
	if err != nil {
		t.Fatalf("query error: %v", err)
	}
	if count != 5 {
		t.Errorf("expected 5 tables, got %d", count)
	}

	db.Close()
}

// TestClose verifies that Close() properly closes the connection.
func TestClose(t *testing.T) {
	db, err := New(":memory:")
	if err != nil {
		t.Fatalf("New() error: %v", err)
	}

	if err := db.Close(); err != nil {
		t.Fatalf("Close() error: %v", err)
	}

	// After close, queries should fail.
	var dummy int
	err = db.Conn().QueryRow("SELECT 1").Scan(&dummy)
	if err == nil {
		t.Error("expected error querying after Close(), got nil")
	}
}

// TestArtistSettingsSchema verifies the artist_settings table has the correct columns.
func TestArtistSettingsSchema(t *testing.T) {
	db, err := New(":memory:")
	if err != nil {
		t.Fatalf("New() error: %v", err)
	}
	defer db.Close()

	// Insert a row to verify column names and types.
	_, err = db.Conn().Exec(
		"INSERT INTO artist_settings (id, name, ignore_singles, ignore_compilations, monitored) VALUES (?, ?, ?, ?, ?)",
		"artist-1", "Test Artist", true, false, true,
	)
	if err != nil {
		t.Fatalf("insert into artist_settings: %v", err)
	}

	var id, name string
	var ignoreSingles, ignoreCompilations, monitored bool
	err = db.Conn().QueryRow(
		"SELECT id, name, ignore_singles, ignore_compilations, monitored FROM artist_settings WHERE id = ?",
		"artist-1",
	).Scan(&id, &name, &ignoreSingles, &ignoreCompilations, &monitored)
	if err != nil {
		t.Fatalf("select from artist_settings: %v", err)
	}

	if id != "artist-1" || name != "Test Artist" || !ignoreSingles || ignoreCompilations || !monitored {
		t.Errorf("unexpected row values: id=%q name=%q ignoreSingles=%v ignoreCompilations=%v monitored=%v",
			id, name, ignoreSingles, ignoreCompilations, monitored)
	}
}

// TestExternalReleasesSchema verifies the external_releases table has the correct columns.
func TestExternalReleasesSchema(t *testing.T) {
	db, err := New(":memory:")
	if err != nil {
		t.Fatalf("New() error: %v", err)
	}
	defer db.Close()

	// Insert parent artist first (FK requirement).
	_, err = db.Conn().Exec("INSERT INTO artist_settings (id, name) VALUES (?, ?)", "artist-1", "Test Artist")
	if err != nil {
		t.Fatalf("insert artist: %v", err)
	}
	_, err = db.Conn().Exec(
		"INSERT INTO external_releases (rgid, artist_id, title, type, release_date, is_ignored) VALUES (?, ?, ?, ?, ?, ?)",
		"rgid-1", "artist-1", "Test Album", "album", "2024-01-01", false,
	)
	if err != nil {
		t.Fatalf("insert into external_releases: %v", err)
	}

	var rgid, artistID, title, releaseType, releaseDate string
	var isIgnored bool
	err = db.Conn().QueryRow(
		"SELECT rgid, artist_id, title, type, release_date, is_ignored FROM external_releases WHERE rgid = ?",
		"rgid-1",
	).Scan(&rgid, &artistID, &title, &releaseType, &releaseDate, &isIgnored)
	if err != nil {
		t.Fatalf("select from external_releases: %v", err)
	}

	if rgid != "rgid-1" || artistID != "artist-1" || title != "Test Album" || releaseType != "album" || releaseDate != "2024-01-01" || isIgnored {
		t.Errorf("unexpected row values")
	}
}

// TestNotificationsSentSchema verifies the notifications_sent table has the correct columns.
func TestNotificationsSentSchema(t *testing.T) {
	db, err := New(":memory:")
	if err != nil {
		t.Fatalf("New() error: %v", err)
	}
	defer db.Close()

	// Insert parent artist and release first (FK requirements).
	_, err = db.Conn().Exec("INSERT INTO artist_settings (id, name) VALUES (?, ?)", "artist-1", "Test Artist")
	if err != nil {
		t.Fatalf("insert artist: %v", err)
	}
	_, err = db.Conn().Exec("INSERT INTO external_releases (rgid, artist_id, title) VALUES (?, ?, ?)", "rgid-1", "artist-1", "Test Album")
	if err != nil {
		t.Fatalf("insert release: %v", err)
	}
	_, err = db.Conn().Exec(
		"INSERT INTO notifications_sent (rgid) VALUES (?)",
		"rgid-1",
	)
	if err != nil {
		t.Fatalf("insert into notifications_sent: %v", err)
	}

	var rgid string
	var sentAt string
	err = db.Conn().QueryRow(
		"SELECT rgid, sent_at FROM notifications_sent WHERE rgid = ?",
		"rgid-1",
	).Scan(&rgid, &sentAt)
	if err != nil {
		t.Fatalf("select from notifications_sent: %v", err)
	}

	if rgid != "rgid-1" {
		t.Errorf("expected rgid 'rgid-1', got %q", rgid)
	}
	if sentAt == "" {
		t.Error("expected sent_at to be non-empty")
	}
}

// TestMigrationTracking verifies that migrations are recorded in _migrations table.
func TestMigrationTracking(t *testing.T) {
	db, err := New(":memory:")
	if err != nil {
		t.Fatalf("New() error: %v", err)
	}
	defer db.Close()

	var count int
	err = db.Conn().QueryRow("SELECT COUNT(*) FROM _migrations").Scan(&count)
	if err != nil {
		t.Fatalf("query migrations count: %v", err)
	}

	// We have 5 recorded migrations: artist_settings, external_releases, local_albums, notifications_sent, cached_at column.
	if count != 5 {
		t.Errorf("expected 5 applied migrations, got %d", count)
	}
}