package util

import (
	MC "app.yhyue.com/moapp/jybase/common"
	"fmt"
	"math/rand"
	"net/http"
	"regexp"
	"sort"
	"strings"
	"time"
)

var (
	mobileReg = regexp.MustCompile("(?i)(Android|Mobile|Phone)")
)

func CheckPlatform(r *http.Request) (p string) {
	p = "PC"
	if CheckIsMobile(r) {
		if CheckWxBrowser(r) {
			p = "WX"
		} else {
			p = "APP"
		}
	}
	return
}

// 判断是否是微信访问
func CheckWxBrowser(Request *http.Request) bool {
	if strings.Index(Request.UserAgent(), "MicroMessenger") > -1 || strings.Index(Request.UserAgent(), "Wechat") > -1 {
		return true
	} else {
		return false
	}
}

// 是否是移动端
func CheckIsMobile(r *http.Request) bool {
	client := r.UserAgent()
	if mobileReg.MatchString(client) {
		return true
	}
	return false
}

func GetFlag(r *http.Request, w http.ResponseWriter, limitFlag string) (string, bool) {
	if limitFlag == "" {
		c, _ := r.Cookie("limitSearchTextFlag")
		if c != nil {
			limitFlag = c.Value
			if limitFlag == "" {
				sid, _ := r.Cookie("SESSIONID")
				limitFlag = sid.Value
				//limitFlag, _ = s.Get("limitSearchTextFlag").(string)
			}
		}
	}
	if limitFlag != "" {
		return limitFlag, true
	}
	limitFlag = MC.GetLetterRandom(5) + fmt.Sprint(time.Now().UnixNano())
	//s.Set("limitSearchTextFlag", limitFlag)
	c := &http.Cookie{
		Name:     "limitSearchTextFlag",
		Value:    limitFlag,
		Path:     "/",
		HttpOnly: false,
		MaxAge:   2592000, //一个月
	}
	http.SetCookie(w, c)
	return limitFlag, false
}

// aData 词库 rData过滤词 count数量
func FilterWord(aData, fData []string, count int) []string {
	var (
		rsData, rData []string
	)
	for _, datum := range aData {
		var isExist bool
		for _, datum1 := range fData {
			if datum == datum1 {
				isExist = true
				break
			}
		}
		if !isExist {
			rsData = append(rsData, datum)
		}
	}
	switch len(rsData) >= count {
	case true:
		for _, i2 := range GenerateRandomNumber(0, len(rsData), count) {
			rData = append(rData, rsData[i2])
		}
	case false:
		for _, i2 := range GenerateRandomNumber(0, len(aData), count) {
			rData = append(rData, aData[i2])
		}
	}
	return rData
}

// 生成count个[start,end)结束的不重复的随机数
func GenerateRandomNumber(start int, end int, count int) []int {
	//范围检查
	if end < start || (end-start) < count {
		return nil
	}
	//存放结果的slice
	nums := make([]int, 0)
	//随机数生成器，加入时间戳保证每次生成的随机数不一样
	r := rand.New(rand.NewSource(time.Now().UnixNano()))
	for len(nums) < count {
		//生成随机数
		num := r.Intn(end-start) + start
		//查重
		exist := false
		for _, v := range nums {
			if v == num {
				exist = true
				break
			}
		}
		if !exist {
			nums = append(nums, num)
		}
	}
	sort.Ints(nums)
	return nums
}