package db

import (
	"log"
	"net/url"
	"os"

	"github.com/jinzhu/gorm"
	"github.com/pkg/errors"
	"gopkg.in/gormigrate.v1"
)

var (
	dbMaxOpenConns = 1
	dbOptions      = url.Values{
		// with this, multiple connections share a single data and schema cache.
		// see https://www.sqlite.org/sharedcache.html
		"cache": {"shared"},
		// with this, the db sleeps for a little while when locked. can prevent
		// a SQLITE_BUSY. see https://www.sqlite.org/c3ref/busy_timeout.html
		"_busy_timeout": {"30000"},
		"_journal_mode": {"WAL"},
		"_foreign_keys": {"true"},
	}
)

type DB struct {
	*gorm.DB
}

func New(path string) (*DB, error) {
	url := url.URL{Path: path}
	url.RawQuery = dbOptions.Encode()
	db, err := gorm.Open("sqlite3", url.String())
	if err != nil {
		return nil, errors.Wrap(err, "with gorm")
	}
	db.SetLogger(log.New(os.Stdout, "gorm ", 0))
	db.DB().SetMaxOpenConns(dbMaxOpenConns)
	migr := gormigrate.New(db, gormigrate.DefaultOptions, []*gormigrate.Migration{
		&migrationInitSchema,
		&migrationCreateInitUser,
		&migrationMergePlaylist,
		&migrationCreateTranscode,
		&migrationAddGenre,
		&migrationUpdateTranscodePrefIDX,
	})
	if err = migr.Migrate(); err != nil {
		return nil, errors.Wrap(err, "migrating to latest version")
	}
	return &DB{DB: db}, nil
}

func NewMock() (*DB, error) {
	return New(":memory:")
}

func (db *DB) GetSetting(key string) string {
	setting := &Setting{}
	db.
		Where("key=?", key).
		First(setting)
	return setting.Value
}

func (db *DB) SetSetting(key, value string) {
	db.
		Where(Setting{Key: key}).
		Assign(Setting{Value: value}).
		FirstOrCreate(&Setting{})
}

func (db *DB) GetUserFromName(name string) *User {
	user := &User{}
	err := db.
		Where("name=?", name).
		First(user).
		Error
	if gorm.IsRecordNotFoundError(err) {
		return nil
	}
	return user
}

func (db *DB) WithTx(cb func(tx *gorm.DB)) {
	tx := db.Begin()
	defer tx.Commit()
	cb(tx)
}