package redis

import (
	"context"
	"hash/crc32"
	"log"
	"math"
	"regexp"
	"strconv"
	"strings"
	"time"

	"github.com/go-redis/redis/v8"
)

type GoRedis struct {
	Addr         string
	Password     string
	Code         string
	DB           int
	DBS          []int //数据库列表
	HashDb       bool  //是否是多个数据库
	PoolSize     int
	MinIdleConns int
	IdleTimeout  int
	Ctx          context.Context
	C            *redis.Client
	BakDb        bool     //是否有备用节点
	Bak          *GoRedis //备用节点连接
}

//初始化单个"[other=]127.0.0.1:2203|127.0.0.1:2204=0-1=1-10=300" [代码]、地址[|备用地址，&集群地址]、库、最大池、空闲时间默认300秒

func (r *GoRedis) Init(opt interface{}) {
	check := false
	code, addr, dbs, pool, idle := "", "", []int{0}, []int{2, 30}, 300
	if so, ok := opt.(string); ok {
		arr := strings.Split(so, "=")
		regAddr := regexp.MustCompile("[0-9.a-zA-Z/]+:[0-9]+.*")
		if len(arr) == 1 {
			if regAddr.MatchString(arr[0]) {
				check = true
				addr = arr[0]
			}
		} else if len(arr) > 1 {
			index := 0
			if regAddr.MatchString(arr[0]) {
				index = 1
				addr = arr[0]
				check = true
			} else if regAddr.MatchString(arr[1]) {
				check = true
				addr = arr[1]
				code = arr[0]
			}
			//解析库配置
			if len(arr) > 2-index { //dbs配置
				dbs1 := strings.Split(arr[2-index], "-")
				if len(dbs1) == 1 || len(dbs1) == 2 {
					check = true
					dbs[0], _ = strconv.Atoi(dbs1[0])
					if len(dbs1) == 2 {
						tmp, _ := strconv.Atoi(dbs1[1])
						dbs = append(dbs, tmp)
					}
				} else {
					check = false
				}
				//解析连接池配置
				if len(arr) > 3-index {
					pool1 := strings.Split(arr[3-index], "-")
					if len(pool1) == 1 || len(pool1) == 2 {
						check = true
						if len(pool1) == 1 {
							pool[1], _ = strconv.Atoi(pool1[0])
							pool[0] = int(math.Ceil(float64(pool[1]) * 0.2))
						} else {
							pool[0], _ = strconv.Atoi(pool1[0])
							pool[1], _ = strconv.Atoi(pool1[1])
						}
					} else {
						check = false
					}
					//解析最大空闲时间配置
					if len(arr) > 4-index {
						idle, _ = strconv.Atoi(arr[4-index])
						if idle == 0 {
							idle = 300
						}
					}
				}
			}
		}
	} else if _, ok := opt.(map[string]interface{}); ok {

	}
	if check {
		addrs := strings.Split(addr, "|")
		r.Addr = addrs[0]
		r.Code = code
		r.DB = dbs[0]
		//DBS          []int
		r.PoolSize = pool[1]
		r.MinIdleConns = pool[0]
		r.IdleTimeout = idle
		r.Ctx = context.Background()
		r.C = redis.NewClient(&redis.Options{
			Addr:         r.Addr,
			DB:           r.DB,
			PoolSize:     r.PoolSize,
			MinIdleConns: r.MinIdleConns,
			IdleTimeout:  time.Duration(r.IdleTimeout) * time.Second,
		})
		if len(dbs) > 1 {
			r.HashDb = true
			r.DBS = []int{}
			for i := dbs[0]; i <= dbs[1]; i++ {
				r.DBS = append(r.DBS, i)
			}
		}
		if len(addrs) == 2 {
			r.BakDb = true
			//有备用节点，集群先不考虑
			r.Bak = &GoRedis{}
			r.Bak.Addr = addrs[1]
			r.Bak.Code = code
			r.Bak.DB = dbs[0]
			r.Bak.DBS = r.DBS
			r.Bak.HashDb = r.HashDb
			r.Bak.PoolSize = pool[1]
			r.Bak.MinIdleConns = pool[0]
			r.Bak.IdleTimeout = idle
			r.Bak.Ctx = context.Background()
			r.Bak.C = redis.NewClient(&redis.Options{
				Addr:         r.Bak.Addr,
				DB:           r.Bak.DB,
				PoolSize:     r.Bak.PoolSize,
				MinIdleConns: r.Bak.MinIdleConns,
				IdleTimeout:  time.Duration(r.Bak.IdleTimeout) * time.Second,
			})
		}
	}

	log.Println(check, code, addr, dbs, pool, idle, r.DBS)
}

func NewGoRedis(Addr, Password, Code string, DB, PoolSize, MinIdleConns, IdleTimeout int) *GoRedis {
	r := &GoRedis{}
	r.C = redis.NewClient(&redis.Options{
		Addr:         Addr,
		Password:     Password,
		DB:           DB,
		PoolSize:     PoolSize,
		MinIdleConns: MinIdleConns,
		IdleTimeout:  time.Duration(IdleTimeout) * time.Second,
	})
	return r
}

func (r *GoRedis) Put(key string, val interface{}) {
	var stutsCmd *redis.StatusCmd
	if r.HashDb { //有多个库
		r.selectDB(key)
		stutsCmd = r.C.Set(r.Ctx, key, val, 0)
	} else {
		stutsCmd = r.C.Set(r.Ctx, key, val, 0)
	}
	str, err := stutsCmd.Result()
	log.Println(str, err)
}

//此处切换失败！！！，只能切换取到的连接，不会切换Client，待验证
func (r *GoRedis) selectDB(key string) {
	db := r.DBS[hashCode(key)%len(r.DBS)] //取存哪个db,可以提取出来一个方法
	r.C.Conn(r.Ctx).Select(r.Ctx, db)     //切换数据库
}

func hashCode(key string) int {
	v := int(crc32.ChecksumIEEE([]byte(key)))
	if v < 0 {
		v = -v
	}
	return v
}