package myredis

import (
	"context"
	"fmt"
	"github.com/go-redis/redis/v8"
	jsoniter "github.com/json-iterator/go"
	"time"
)

const DefaultKey = "default"

var (
	DefaultConfig = &Config{
		Addr:        "127.0.0.1:6379",
		Password:    "",
		DB:          0,
		PoolSize:    16,
		MinIdleConn: 4,
		MaxConnAge:  "1h",
		IdleTimeout: "10m",
	}

	instanceMap = make(map[string]*MyRedis)
)

type (
	MyRedis struct {
		redis *redis.Client
		ctx   context.Context
	}

	Config struct {
		Addr        string
		Password    string
		DB          int
		PoolSize    int
		MinIdleConn int
		MaxConnAge  string
		IdleTimeout string
	}
)

func Instance(key ...string) *MyRedis {
	var key0 string

	if len(key) > 0 {
		key0 = key[0]
	} else {
		key0 = DefaultKey
	}

	instance, ok := instanceMap[key0]
	if !ok {
		panic(fmt.Errorf("%s not config", key))
	}
	return instance
}

func NewDefault(config *Config) (*MyRedis, error) {
	return New(DefaultKey, config)
}

func New(key string, config *Config) (*MyRedis, error) {
	var (
		maxConnAge, _  = time.ParseDuration(DefaultConfig.MaxConnAge)
		idleTimeout, _ = time.ParseDuration(DefaultConfig.IdleTimeout)
	)

	if config.PoolSize <= 0 {
		config.MinIdleConn = DefaultConfig.PoolSize
	}

	if config.MinIdleConn <= 0 {
		config.MinIdleConn = DefaultConfig.MinIdleConn
	}

	if config.MaxConnAge != "" {
		t, err := time.ParseDuration(config.MaxConnAge)
		if err != nil {
			return nil, fmt.Errorf("parse MaxConnAge err: %s\n", err)

		}
		maxConnAge = t
	}

	if config.IdleTimeout != "" {
		t, err := time.ParseDuration(config.IdleTimeout)
		if err != nil {
			return nil, fmt.Errorf("parse IdleTimeout err: %s\n", err)

		}
		idleTimeout = t
	}

	client := redis.NewClient(&redis.Options{
		Addr:         config.Addr,
		Password:     config.Password,
		DB:           config.DB,
		PoolSize:     config.PoolSize,
		MinIdleConns: config.MinIdleConn,
		MaxConnAge:   maxConnAge,
		IdleTimeout:  idleTimeout,
	})

	ctx := context.Background()
	rd := &MyRedis{}
	rd.ctx = ctx
	rd.redis = client
	ping := rd.redis.Ping(ctx)
	if ping.Err() != nil {
		return nil, fmt.Errorf("connet redis err: %s", ping.Err())
	}

	instanceMap[key] = rd
	return rd, nil
}

// Get 通用get
func (r *MyRedis) Get(key string) (string, error) {
	return r.redis.Get(r.ctx, key).Result()
}

// Set 通用set
func (r *MyRedis) Set(key string, value interface{}, t ...time.Duration) (string, error) {
	var t2 time.Duration
	if len(t) > 0 {
		t2 = t[0]
	}
	return r.redis.Set(r.ctx, key, value, t2).Result()
}

// GetJson json序列化
func (r *MyRedis) GetJson(key string) (interface{}, error) {
	res := r.redis.Get(r.ctx, key)
	if res.Err() != nil {
		return nil, res.Err()
	}

	b, err := res.Bytes()
	if err != nil {
		return nil, fmt.Errorf("get key:%s 反序列化json失败(-1)", key)
	}
	var result interface{}
	err = jsoniter.Unmarshal(b, &result)
	if err != nil {
		return nil, fmt.Errorf("get key:%s 反序列化json失败(-2)", key)
	}
	return result, nil
}

// SetJson json序列化set
func (r *MyRedis) SetJson(key string, value interface{}, t ...time.Duration) (string, error) {
	var t2 time.Duration
	if len(t) > 0 {
		t2 = t[0]
	}
	v, err := jsoniter.Marshal(value)
	if err != nil {
		return "", fmt.Errorf("set key:%s 序列化json失败", key)
	}
	return r.redis.Set(r.ctx, key, v, t2).Result()
}

func (r *MyRedis) Close() {
	if r.redis != nil {
		r.redis.Close()
	}
}

func (r *MyRedis) Redis() *redis.Client {
	return r.redis
}