package db

import (
	migrate "github.com/go-pg/migrations"
	"github.com/go-pg/pg"
	"github.com/go-pg/pg/orm"
	"github.com/go-redis/redis"
	"github.com/jloup/utils"
)

var log = utils.StandardL().WithField("module", "db")

var (
	DB    *pg.DB
	Redis *redis.Client
)

type DBConfig struct {
	Type     string // tcp or unix
	Address  string
	Database string
	User     string
	Password string
}

type RedisConfig struct {
	Type     string // tcp or unix
	Address  string
	Password string
	Database int
}

func Init(config DBConfig, redisConfig RedisConfig) {
	var err error

	DB = connect(config)

	err = migratedb()
	if err != nil {
		log.Fatalf("cannot migratedb '%v'\n", err)
	}

	Redis = redis.NewClient(&redis.Options{
		Network:  redisConfig.Type,
		Addr:     redisConfig.Address,
		Password: redisConfig.Password,
		DB:       redisConfig.Database,
	})

	_, err = Redis.Ping().Result()

	if err != nil {
		log.Fatalf("redis init error %s", err)
	}

}

func migratedb() error {
	/* Remove after first MEP */
	version, err := migrate.Version(DB)
	if err != nil {
		return err
	}

	if version == 0 {
		return migrate.SetVersion(DB, 1)
	}
	/***/

	mig := make([]migrate.Migration, 0)

	for _, migration := range migrations {
		mig = append(mig, migrate.Migration{
			Version: migration.Version,
			Up: func(db orm.DB) error {
				for _, query := range migration.Up {
					_, err := db.Exec(query)
					if err != nil {
						return err
					}
				}

				return nil
			},
			Down: func(db orm.DB) error {
				for _, query := range migration.Down {
					_, err := db.Exec(query)
					if err != nil {
						return err
					}
				}

				return nil
			},
		})
	}

	oldVersion, newVersion, err := migrate.RunMigrations(DB, mig, "up")

	if oldVersion != newVersion {
		log.Infof("Migrate DB: %v -> %v", oldVersion, newVersion)
	} else {
		log.Infof("DB up-to-date: version '%v'", newVersion)
	}
	return err
}

func connect(config DBConfig) *pg.DB {
	return pg.Connect(&pg.Options{
		User:     config.User,
		Password: config.Password,
		Database: config.Database,
		Network:  config.Type,
		Addr:     config.Address,
	})
}