package bolt

import (
	"errors"
	"github.com/gisle/stufflog/config"
	"github.com/gisle/stufflog/database/repositories"
	"go.etcd.io/bbolt"
	"time"
	"unsafe"
)

// A Database is a database.Database implementation using a bolt backend.
type Database struct {
	users        repositories.UserRepository
	userSessions repositories.UserSessionRepository
	activities   repositories.ActivityRepository
	periods      repositories.PeriodRepository
}

func (database *Database) Users() repositories.UserRepository {
	return database.users
}

func (database *Database) UserSessions() repositories.UserSessionRepository {
	return database.userSessions
}

func (database *Database) Activities() repositories.ActivityRepository {
	return database.activities
}

func (database *Database) Periods() repositories.PeriodRepository {
	return database.periods
}

func Init(cfg config.Database) (*Database, error) {
	opts := *bbolt.DefaultOptions
	opts.Timeout = time.Second * 5
	db, err := bbolt.Open(cfg.Path, 0700, &opts)
	if err != nil {
		return nil, err
	}

	users, err := newUserRepository(db)
	if err != nil {
		return nil, err
	}
	userSessions, err := newUserSessionRepository(db)
	if err != nil {
		return nil, err
	}
	periods, err := newPeriodRepository(db)
	if err != nil {
		return nil, err
	}
	activities, err := newActivityRepository(db)
	if err != nil {
		return nil, err
	}

	database := &Database{
		users:        users,
		userSessions: userSessions,
		periods:      periods,
		activities:   activities,
	}

	return database, nil
}

// unsafeStringToBytes makes a byte array, mutation is punishable by segfault.
func unsafeStringToBytes(s string) []byte {
	return *(*[]byte)(unsafe.Pointer(&s))
}

var errUnchanged = errors.New("database/bolt: unchanged")