package database

import (
	"database/sql"
	"fmt"

	"github.com/golang-migrate/migrate/v4"
	"github.com/golang-migrate/migrate/v4/database/postgres"
	_ "github.com/golang-migrate/migrate/v4/source/file"
	_ "github.com/lib/pq"
)

func Connect(databaseURL string) (*sql.DB, error) {
	db, err := sql.Open("postgres", databaseURL)
	if err != nil {
		return nil, fmt.Errorf("open db: %w", err)
	}
	if err := db.Ping(); err != nil {
		return nil, fmt.Errorf("ping db: %w", err)
	}
	db.SetMaxOpenConns(25)
	db.SetMaxIdleConns(5)
	return db, nil
}

func RunMigrations(db *sql.DB) error {
	driver, err := postgres.WithInstance(db, &postgres.Config{})
	if err != nil {
		return fmt.Errorf("migration driver: %w", err)
	}
	m, err := migrate.NewWithDatabaseInstance(
		"file://internal/database/migrations",
		"postgres",
		driver,
	)
	if err != nil {
		return fmt.Errorf("migrate init: %w", err)
	}
	if err := m.Up(); err != nil && err != migrate.ErrNoChange {
		return fmt.Errorf("migrate up: %w", err)
	}
	return nil
}