package db

import (
	"database/sql"
	"fmt"
	"strings"

	_ "modernc.org/sqlite"
)

// OpenSQLite opens (creating if needed) a SQLite database tuned for a single
// writer with concurrent readers: WAL journalling, a busy timeout so writers
// wait instead of failing, and enforced foreign keys.
func OpenSQLite(path string) (*sql.DB, error) {
	if strings.TrimSpace(path) == "" {
		return nil, fmt.Errorf("sqlite path is required")
	}
	dsn := fmt.Sprintf(
		"file:%s?_pragma=journal_mode(WAL)&_pragma=busy_timeout(5000)&_pragma=foreign_keys(1)&_pragma=synchronous(NORMAL)&_txlock=immediate",
		path,
	)
	db, err := sql.Open("sqlite", dsn)
	if err != nil {
		return nil, fmt.Errorf("open sqlite: %w", err)
	}
	if err := db.Ping(); err != nil {
		_ = db.Close()
		return nil, fmt.Errorf("ping sqlite: %w", err)
	}
	return db, nil
}