package sessions

import (
	"github.com/boj/redistore"
	"github.com/garyburd/redigo/redis"
	"github.com/gorilla/sessions"
)

type RedisStore interface {
	Store
}

// size: maximum number of idle connections.
// network: tcp or udp
// address: host:port
// password: redis-password
// Keys are defined in pairs to allow key rotation, but the common case is to set a single
// authentication key and optionally an encryption key.
//
// The first key in a pair is used for authentication and the second for encryption. The
// encryption key can be set to nil or omitted in the last pair, but the authentication key
// is required in all pairs.
//
// It is recommended to use an authentication key with 32 or 64 bytes. The encryption key,
// if set, must be either 16, 24, or 32 bytes to select AES-128, AES-192, or AES-256 modes.
func NewRedisStore(size int, network, address, password string, keyPairs ...[]byte) (RedisStore, error) {
	store, err := redistore.NewRediStore(size, network, address, password, keyPairs...)
	if err != nil {
		return nil, err
	}
	return &redisStore{store}, nil
}

// NewRedisStoreWithDB - like NewRedisStore but accepts `DB` parameter to select
// redis DB instead of using the default one ("0")
//
// Ref: https://godoc.org/github.com/boj/redistore#NewRediStoreWithDB
func NewRedisStoreWithDB(size int, network, address, password, DB string, keyPairs ...[]byte) (RedisStore, error) {
	store, err := redistore.NewRediStoreWithDB(size, network, address, password, DB, keyPairs...)
	if err != nil {
		return nil, err
	}
	return &redisStore{store}, nil
}

// NewRedisStoreWithPool instantiates a RediStore with a *redis.Pool passed in.
//
// Ref: https://godoc.org/github.com/boj/redistore#NewRediStoreWithPool
func NewRedisStoreWithPool(pool *redis.Pool, keyPairs ...[]byte) (RedisStore, error) {
	store, err := redistore.NewRediStoreWithPool(pool, keyPairs...)
	if err != nil {
		return nil, err
	}
	return &redisStore{store}, nil
}

type redisStore struct {
	*redistore.RediStore
}

func (c *redisStore) Options(options Options) {
	c.RediStore.Options = &sessions.Options{
		Path:     options.Path,
		Domain:   options.Domain,
		MaxAge:   options.MaxAge,
		Secure:   options.Secure,
		HttpOnly: options.HttpOnly,
	}
}
