package database

import (
	"database/sql"
	"fmt"
	"time"

	_ "modernc.org/sqlite"
)

// Open creates a *sql.DB for a SQLite database file with sensible defaults.
func Open(dbPath string) (*sql.DB, error) {
	db, err := sql.Open("sqlite", dbPath)
	if err != nil {
		return nil, fmt.Errorf("sql.Open: %w", err)
	}

	db.SetMaxOpenConns(1)
	db.SetMaxIdleConns(1)
	db.SetConnMaxLifetime(0)

	// Enable WAL mode and busy timeout for better concurrency.
	for _, pragma := range []string{
		"PRAGMA journal_mode=WAL",
		"PRAGMA busy_timeout=5000",
		"PRAGMA foreign_keys=ON",
	} {
		if _, err := db.Exec(pragma); err != nil {
			db.Close()
			return nil, fmt.Errorf("%s: %w", pragma, err)
		}
	}

	if err := db.Ping(); err != nil {
		db.Close()
		return nil, fmt.Errorf("ping: %w", err)
	}

	return db, nil
}

// SetPoolForTest overrides pool settings (useful in tests with in-memory DBs).
func SetPoolForTest(db *sql.DB) {
	db.SetMaxOpenConns(1)
	db.SetMaxIdleConns(1)
	db.SetConnMaxLifetime(10 * time.Minute)
}