// Package database owns SQLite setup, migrations, and persistence repositories.
package database

import (
	"context"
	"database/sql"
	"errors"
	"fmt"
	"os"
	"path/filepath"
	"strings"

	_ "modernc.org/sqlite"
)

// Open creates the parent directory, opens SQLite, enables required pragmas,
// runs embedded migrations, and verifies connectivity.
func Open(ctx context.Context, path string) (*sql.DB, error) {
	if strings.TrimSpace(path) == "" {
		return nil, errors.New("database path must not be empty")
	}
	if path != ":memory:" {
		if err := os.MkdirAll(filepath.Dir(path), 0o750); err != nil {
			return nil, fmt.Errorf("create database directory: %w", err)
		}
	}

	dsn := path
	if path != ":memory:" {
		dsn = "file:" + filepath.ToSlash(path)
	}
	separator := "?"
	if strings.Contains(dsn, "?") {
		separator = "&"
	}
	dsn += separator + "_pragma=foreign_keys(1)&_pragma=busy_timeout(5000)&_pragma=journal_mode(WAL)"

	db, err := sql.Open("sqlite", dsn)
	if err != nil {
		return nil, fmt.Errorf("open SQLite: %w", err)
	}
	db.SetMaxOpenConns(1)
	db.SetMaxIdleConns(1)
	if err := db.PingContext(ctx); err != nil {
		db.Close()
		return nil, fmt.Errorf("ping SQLite: %w", err)
	}
	if err := Migrate(ctx, db); err != nil {
		db.Close()
		return nil, err
	}
	return db, nil
}