cleaned up project structure and optimized lastfm and spotify migration

migrate/migrate.go

@@ -0,0 +1,55 @@
+package migrate
+
+import (
+	"context"
+	"fmt"
+	"os"
+
+	"github.com/jackc/pgx/v5"
+)
+
+func TableExists(name string, conn *pgx.Conn) bool {
+	var exists bool
+	err := conn.QueryRow(
+		context.Background(),
+		`SELECT EXISTS (SELECT 1 FROM pg_tables WHERE schemaname = 'public' AND 
+		tablename = $1);`,
+		name,
+	).
+		Scan(&exists)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "SELECT EXISTS failed: %v\n", err)
+		return false
+	}
+	return exists
+}
+
+func DbExists() bool {
+	conn, err := pgx.Connect(
+		context.Background(),
+		"postgres://postgres:postgres@localhost:5432/muzi",
+	)
+	if err != nil {
+		return false
+	}
+	defer conn.Close(context.Background())
+	return true
+}
+
+func CreateDB() error {
+	conn, err := pgx.Connect(
+		context.Background(),
+		"postgres://postgres:postgres@localhost:5432",
+	)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Cannot connect to PostgreSQL: %v\n", err)
+		return err
+	}
+	defer conn.Close(context.Background())
+	_, err = conn.Exec(context.Background(), "CREATE DATABASE muzi")
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Cannot create muzi database: %v\n", err)
+		return err
+	}
+	return nil
+}