package cache

import (
	"strconv"
	"time"

	"github.com/go-redis/redis"
)

var pools *redis.ClusterClient

func NewRedisCluster(addrs []string) error {
	opt := &redis.ClusterOptions{
		Addrs:        addrs,
		PoolSize:     redisPoolSize,
		PoolTimeout:  redisPoolTTL,
		IdleTimeout:  redisIdleTTL,
		DialTimeout:  redisDialTTL,
		ReadTimeout:  redisReadTTL,
		WriteTimeout: redisWriteTTL,
	}
	pools = redis.NewClusterClient(opt)
	if err := pools.Ping().Err(); err != nil {
		return err
	}
	return nil
}

func RCGet(key string) (interface{}, error) {
	res, err := pools.Get(key).Result()
	if err != nil {
		return nil, convertError(err)
	}
	return []byte(res), nil
}
func RCSet(key string, value interface{}) error {
	err := pools.Set(key, value, 0).Err()
	return convertError(err)
}
func RCGetSet(key string, value interface{}) (interface{}, error) {
	res, err := pools.GetSet(key, value).Result()
	if err != nil {
		return nil, convertError(err)
	}
	return []byte(res), nil
}
func RCSetNx(key string, value interface{}) (int64, error) {
	res, err := pools.SetNX(key, value, 0).Result()
	if err != nil {
		return 0, convertError(err)
	}
	if res {
		return 1, nil
	}
	return 0, nil
}
func RCSetEx(key string, value interface{}, timeout int64) error {
	_, err := pools.Set(key, value, time.Duration(timeout)*time.Second).Result()
	if err != nil {
		return convertError(err)
	}
	return nil
}

// nil表示成功，ErrNil表示数据库内已经存在这个key，其他表示数据库发生错误
func RCSetNxEx(key string, value interface{}, timeout int64) error {
	res, err := pools.SetNX(key, value, time.Duration(timeout)*time.Second).Result()
	if err != nil {
		return convertError(err)
	}
	if res {
		return nil
	}
	return ErrNil
}
func RCMGet(keys ...string) ([]interface{}, error) {
	res, err := pools.MGet(keys...).Result()
	return res, convertError(err)
}

// 为确保多个key映射到同一个slot，每个key最好加上hash tag，如:{test}
func RCMSet(kvs map[string]interface{}) error {
	pairs := make([]string, 0, len(kvs)*2)
	for k, v := range kvs {
		val, err := String(v, nil)
		if err != nil {
			return err
		}
		pairs = append(pairs, k, val)
	}
	return convertError(pools.MSet(pairs).Err())
}

// 为确保多个key映射到同一个slot，每个key最好加上hash tag，如:{test}
func RCMSetNX(kvs map[string]interface{}) (bool, error) {
	pairs := make([]string, 0, len(kvs)*2)
	for k, v := range kvs {
		val, err := String(v, nil)
		if err != nil {
			return false, err
		}
		pairs = append(pairs, k, val)
	}
	res, err := pools.MSetNX(pairs).Result()
	return res, convertError(err)
}
func RCExpireAt(key string, timestamp int64) (int64, error) {
	res, err := pools.ExpireAt(key, time.Unix(timestamp, 0)).Result()
	if err != nil {
		return 0, convertError(err)
	}
	if res {
		return 1, nil
	}
	return 0, nil
}
func RCDel(keys ...string) (int64, error) {
	args := make([]interface{}, 0, len(keys))
	for _, key := range keys {
		args = append(args, key)
	}
	res, err := pools.Del(keys...).Result()
	if err != nil {
		return res, convertError(err)
	}
	return res, nil
}
func RCIncr(key string) (int64, error) {
	res, err := pools.Incr(key).Result()
	if err != nil {
		return res, convertError(err)
	}
	return res, nil
}
func RCIncrBy(key string, delta int64) (int64, error) {
	res, err := pools.IncrBy(key, delta).Result()
	if err != nil {
		return res, convertError(err)
	}
	return res, nil
}
func RCExpire(key string, duration int64) (int64, error) {
	res, err := pools.Expire(key, time.Duration(duration)*time.Second).Result()
	if err != nil {
		return 0, convertError(err)
	}
	if res {
		return 1, nil
	}
	return 0, nil
}
func RCExists(key string) (bool, error) {
	res, err := pools.Exists(key).Result()
	if err != nil {
		return false, convertError(err)
	}
	if res > 0 {
		return true, nil
	}
	return false, nil
}
func RCHGet(key string, field string) (interface{}, error) {
	res, err := pools.HGet(key, field).Result()
	if err != nil {
		return nil, convertError(err)
	}
	return []byte(res), nil
}
func RCHLen(key string) (int64, error) {
	res, err := pools.HLen(key).Result()
	if err != nil {
		return res, convertError(err)
	}
	return res, nil
}
func RCHSet(key string, field string, val interface{}) error {
	value, err := String(val, nil)
	if err != nil && err != ErrNil {
		return err
	}
	_, err = pools.HSet(key, field, value).Result()
	if err != nil {
		return convertError(err)
	}
	return nil
}
func RCHDel(key string, fields ...string) (int64, error) {
	args := make([]interface{}, 0, len(fields)+1)
	args = append(args, key)
	for _, field := range fields {
		args = append(args, field)
	}
	res, err := pools.HDel(key, fields...).Result()
	if err != nil {
		return 0, convertError(err)
	}
	return res, nil
}

func RCHMGet(key string, fields ...string) (interface{}, error) {
	args := make([]interface{}, 0, len(fields)+1)
	args = append(args, key)
	for _, field := range fields {
		args = append(args, field)
	}
	if len(fields) == 0 {
		return nil, ErrNil
	}
	res, err := pools.HMGet(key, fields...).Result()
	if err != nil {
		return nil, convertError(err)
	}
	return res, nil
}
func RCHMSet(key string, kvs ...interface{}) error {
	if len(kvs) == 0 {
		return nil
	}
	if len(kvs)%2 != 0 {
		return ErrWrongArgsNum
	}
	var err error
	v := map[string]interface{}{} // todo change
	v["field"], err = String(kvs[0], nil)
	if err != nil && err != ErrNil {
		return err
	}
	v["value"], err = String(kvs[1], nil)
	if err != nil && err != ErrNil {
		return err
	}
	pairs := make([]string, 0, len(kvs)-2)
	if len(kvs) > 2 {
		for _, kv := range kvs[2:] {
			kvString, err := String(kv, nil)
			if err != nil && err != ErrNil {
				return err
			}
			pairs = append(pairs, kvString)
		}
	}
	v["paris"] = pairs
	_, err = pools.HMSet(key, v).Result()
	if err != nil {
		return convertError(err)
	}
	return nil
}

func RCHKeys(key string) ([]string, error) {
	res, err := pools.HKeys(key).Result()
	if err != nil {
		return res, convertError(err)
	}
	return res, nil
}
func RCHVals(key string) ([]interface{}, error) {
	res, err := pools.HVals(key).Result()
	if err != nil {
		return nil, convertError(err)
	}
	rs := make([]interface{}, 0, len(res))
	for _, res := range res {
		rs = append(rs, res)
	}
	return rs, nil
}
func RCHGetAll(key string) (map[string]string, error) {
	vals, err := pools.HGetAll(key).Result()
	if err != nil {
		return nil, convertError(err)
	}
	return vals, nil
}
func RCHIncrBy(key, field string, delta int64) (int64, error) {
	res, err := pools.HIncrBy(key, field, delta).Result()
	if err != nil {
		return res, convertError(err)
	}
	return res, nil
}
func RCZAdd(key string, kvs ...interface{}) (int64, error) {
	args := make([]interface{}, 0, len(kvs)+1)
	args = append(args, key)
	args = append(args, kvs...)
	if len(kvs) == 0 {
		return 0, nil
	}
	if len(kvs)%2 != 0 {
		return 0, ErrWrongArgsNum
	}
	zs := make([]redis.Z, len(kvs)/2)
	for i := 0; i < len(kvs); i += 2 {
		idx := i / 2
		score, err := Float64(kvs[i], nil)
		if err != nil && err != ErrNil {
			return 0, err
		}
		zs[idx].Score = score
		zs[idx].Member = kvs[i+1]
	}
	res, err := pools.ZAdd(key, zs...).Result()
	if err != nil {
		return res, convertError(err)
	}
	return res, nil
}
func RCZRem(key string, members ...string) (int64, error) {
	args := make([]interface{}, 0, len(members))
	args = append(args, key)
	for _, member := range members {
		args = append(args, member)
	}
	res, err := pools.ZRem(key, members).Result()
	if err != nil {
		return res, convertError(err)
	}
	return res, err
}

func RCZRange(key string, min, max int64, withScores bool) (interface{}, error) {
	res := make([]interface{}, 0)
	if withScores {
		zs, err := pools.ZRangeWithScores(key, min, max).Result()
		if err != nil {
			return nil, convertError(err)
		}
		for _, z := range zs {
			res = append(res, z.Member, strconv.FormatFloat(z.Score, 'f', -1, 64))
		}
	} else {
		ms, err := pools.ZRange(key, min, max).Result()
		if err != nil {
			return nil, convertError(err)
		}
		for _, m := range ms {
			res = append(res, m)
		}
	}
	return res, nil
}
func RCZRangeByScoreWithScore(key string, min, max int64) (map[string]int64, error) {
	opt := new(redis.ZRangeBy)
	opt.Min = strconv.FormatInt(int64(min), 10)
	opt.Max = strconv.FormatInt(int64(max), 10)
	opt.Count = -1
	opt.Offset = 0
	vals, err := pools.ZRangeByScoreWithScores(key, *opt).Result()
	if err != nil {
		return nil, convertError(err)
	}
	res := make(map[string]int64, len(vals))
	for _, val := range vals {
		key, err := String(val.Member, nil)
		if err != nil && err != ErrNil {
			return nil, err
		}
		res[key] = int64(val.Score)
	}
	return res, nil
}
func RCLRange(key string, start, stop int64) (interface{}, error) {
	res, err := pools.LRange(key, start, stop).Result()
	if err != nil {
		return nil, convertError(err)
	}
	return res, nil
}
func RCLSet(key string, index int, value interface{}) error {
	err := pools.LSet(key, int64(index), value).Err()
	return convertError(err)
}
func RCLLen(key string) (int64, error) {
	res, err := pools.LLen(key).Result()
	if err != nil {
		return res, convertError(err)
	}
	return res, nil
}
func RCLRem(key string, count int, value interface{}) (int, error) {
	val, _ := value.(string)
	res, err := pools.LRem(key, int64(count), val).Result()
	if err != nil {
		return int(res), convertError(err)
	}
	return int(res), nil
}
func RCTTl(key string) (int64, error) {
	duration, err := pools.TTL(key).Result()
	if err != nil {
		return int64(duration.Seconds()), convertError(err)
	}
	return int64(duration.Seconds()), nil
}
func RCLPop(key string) (interface{}, error) {
	res, err := pools.LPop(key).Result()
	if err != nil {
		return nil, convertError(err)
	}
	return res, nil
}
func RCRPop(key string) (interface{}, error) {
	res, err := pools.RPop(key).Result()
	if err != nil {
		return nil, convertError(err)
	}
	return res, nil
}
func RCBLPop(key string, timeout int) (interface{}, error) {
	res, err := pools.BLPop(time.Duration(timeout)*time.Second, key).Result()
	if err != nil {
		// 兼容redis 2.x
		if err == redis.Nil {
			return nil, ErrNil
		}
		return nil, err
	}
	return res[1], nil
}
func RCBRPop(key string, timeout int) (interface{}, error) {
	res, err := pools.BRPop(time.Duration(timeout)*time.Second, key).Result()
	if err != nil {
		// 兼容redis 2.x
		if err == redis.Nil {
			return nil, ErrNil
		}
		return nil, convertError(err)
	}
	return res[1], nil
}
func RCLPush(key string, value ...interface{}) error {
	args := make([]interface{}, 0, len(value)+1)
	args = append(args, key)
	args = append(args, value...)
	vals := make([]string, 0, len(value))
	for _, v := range value {
		val, err := String(v, nil)
		if err != nil && err != ErrNil {
			return err
		}
		vals = append(vals, val)
	}
	_, err := pools.LPush(key, vals).Result() // todo ...
	if err != nil {
		return convertError(err)
	}
	return nil
}
func RCRPush(key string, value ...interface{}) error {
	args := make([]interface{}, 0, len(value)+1)
	args = append(args, key)
	args = append(args, value...)
	vals := make([]string, 0, len(value))
	for _, v := range value {
		val, err := String(v, nil)
		if err != nil && err != ErrNil {
			if err == ErrNil {
				continue
			}
			return err
		}
		if val == "" {
			continue
		}
		vals = append(vals, val)
	}
	_, err := pools.RPush(key, vals).Result() // todo ...
	if err != nil {
		return convertError(err)
	}
	return nil
}

// 为确保srcKey跟destKey映射到同一个slot，srcKey和destKey需要加上hash tag，如:{test}
func RCBRPopLPush(srcKey string, destKey string, timeout int) (interface{}, error) {
	res, err := pools.BRPopLPush(srcKey, destKey, time.Duration(timeout)*time.Second).Result()
	if err != nil {
		return nil, convertError(err)
	}
	return res, nil
}

// 为确保srcKey跟destKey映射到同一个slot，srcKey和destKey需要加上hash tag，如:{test}
func RCRPopLPush(srcKey string, destKey string) (interface{}, error) {
	res, err := pools.RPopLPush(srcKey, destKey).Result()
	if err != nil {
		return nil, convertError(err)
	}
	return res, nil
}
func RCSAdd(key string, members ...interface{}) (int64, error) {
	args := make([]interface{}, 0, len(members)+1)
	args = append(args, key)
	args = append(args, members...)
	ms := make([]string, 0, len(members))
	for _, member := range members {
		m, err := String(member, nil)
		if err != nil && err != ErrNil {
			return 0, err
		}
		ms = append(ms, m)
	}
	res, err := pools.SAdd(key, ms).Result() // todo ...
	if err != nil {
		return res, convertError(err)
	}
	return res, nil
}
func RCSPop(key string) ([]byte, error) {
	res, err := pools.SPop(key).Result()
	if err != nil {
		return nil, convertError(err)
	}
	return []byte(res), nil
}
func RCSIsMember(key string, member interface{}) (bool, error) {
	m, _ := member.(string)
	res, err := pools.SIsMember(key, m).Result()
	if err != nil {
		return res, convertError(err)
	}
	return res, nil
}
func RCSRem(key string, members ...interface{}) (int64, error) {
	args := make([]interface{}, 0, len(members)+1)
	args = append(args, key)
	args = append(args, members...)
	ms := make([]string, 0, len(members))
	for _, member := range members {
		m, err := String(member, nil)
		if err != nil && err != ErrNil {
			return 0, err
		}
		ms = append(ms, m)
	}
	res, err := pools.SRem(key, ms).Result() // todo ...
	if err != nil {
		return res, convertError(err)
	}
	return res, nil
}
func RCSMembers(key string) ([]string, error) {
	res, err := pools.SMembers(key).Result()
	if err != nil {
		return nil, convertError(err)
	}
	return res, nil
}
func RCScriptLoad(luaScript string) (interface{}, error) {
	res, err := pools.ScriptLoad(luaScript).Result()
	if err != nil {
		return nil, convertError(err)
	}
	return res, nil
}
func RCEvalSha(sha1 string, numberKeys int, keysArgs ...interface{}) (interface{}, error) {
	vals := make([]interface{}, 0, len(keysArgs)+2)
	vals = append(vals, sha1, numberKeys)
	vals = append(vals, keysArgs...)
	keys := make([]string, 0, numberKeys)
	args := make([]string, 0, len(keysArgs)-numberKeys)
	for i, value := range keysArgs {
		val, err := String(value, nil)
		if err != nil && err != ErrNil {
			return nil, err
		}
		if i < numberKeys {
			keys = append(keys, val)
		} else {
			args = append(args, val)
		}
	}
	res, err := pools.EvalSha(sha1, keys, args).Result()
	if err != nil {
		return nil, convertError(err)
	}
	return res, nil
}
func RCEval(luaScript string, numberKeys int, keysArgs ...interface{}) (interface{}, error) {
	vals := make([]interface{}, 0, len(keysArgs)+2)
	vals = append(vals, luaScript, numberKeys)
	vals = append(vals, keysArgs...)
	keys := make([]string, 0, numberKeys)
	args := make([]string, 0, len(keysArgs)-numberKeys)
	for i, value := range keysArgs {
		val, err := String(value, nil)
		if err != nil && err != ErrNil {
			return nil, err
		}
		if i < numberKeys {
			keys = append(keys, val)
		} else {
			args = append(args, val)
		}
	}
	res, err := pools.Eval(luaScript, keys, args).Result()
	if err != nil {
		return nil, convertError(err)
	}
	return res, nil
}
func RCGetBit(key string, offset int64) (int64, error) {
	res, err := pools.GetBit(key, offset).Result()
	if err != nil {
		return res, convertError(err)
	}
	return res, nil
}
func RCSetBit(key string, offset uint32, value int) (int, error) {
	res, err := pools.SetBit(key, int64(offset), value).Result()
	return int(res), convertError(err)
}
func RCGetClient() *redis.ClusterClient {
	return pools
}
func convertError(err error) error {
	if err == redis.Nil {
		// 为了兼容redis 2.x,这里不返回 ErrNil，ErrNil在调用redis_cluster_reply函数时才返回
		return nil
	}
	return err
}