package versionSer

import (
	"bufio"
	"bytes"
	"context"
	"fmt"
	"io"
	"os"
	"regexp"
	"stat/api/proto"
	"stat/common/log"
	"stat/common/utils"
	downloadinfo "stat/models/downloadinfo"
	"stat/models/versionMod"
	"stat/service/cacheSer"
	"stat/statg"
	"time"

	"github.com/google/uuid"
	"github.com/xxjwxc/public/myglobal/snowflake"
)

func GenerateConfigFile(origin, target, configFile, DC, PC string) ([]byte, string) {
	if len(DC) > 0 && len(PC) > 0 {
		node, err := snowflake.NewNode(1)
		if err == nil {
			id := node.Generate()
			target = fmt.Sprintf("%s?dc=%s&pc=%s&UID=%d", target, DC, PC, id)
		}
	} else if len(DC) > 0 {
		node, err := snowflake.NewNode(1)
		if err == nil {
			id := node.Generate()
			target = fmt.Sprintf("%s?dc=%s&UID=%d", target, DC, id)
		}
	} else if len(PC) > 0 {
		node, err := snowflake.NewNode(1)
		if err == nil {
			id := node.Generate()
			target = fmt.Sprintf("%s?pc=%s&UID=%d", target, PC, id)
		}
	} else {
		node, err := snowflake.NewNode(1)
		if err == nil {
			id := node.Generate()
			target = fmt.Sprintf("%s?UID=%d", target, id)
		}
	}
	target = fmt.Sprintf("%s&isLight=true", target)
	output, _, err := readFile("conf/"+configFile, origin, target)
	if err != nil {
		output, _ = os.ReadFile("conf/" + configFile)
	}
	return uniqueProfileIdentity(output, configFile), configFile
}

// profileIDNamespace 标识符派生的固定命名空间,保证同一模板每次生成的值一致
var profileIDNamespace = uuid.NewSHA1(uuid.NameSpaceURL, []byte("stat_center/mobileconfig"))

var (
	rePayloadIdent = regexp.MustCompile(`(<key>PayloadIdentifier</key>[ \t]*\r?\n[ \t]*<string>)([^<]*)(</string>)`)
	rePayloadUUID  = regexp.MustCompile(`(<key>PayloadUUID</key>[ \t]*\r?\n[ \t]*<string>)([^<]*)(</string>)`)
	reUUIDValue    = regexp.MustCompile(`[0-9A-Fa-f]{8}-[0-9A-Fa-f]{4}-[0-9A-Fa-f]{4}-[0-9A-Fa-f]{4}-[0-9A-Fa-f]{12}`)
)

// uniqueProfileIdentity 把 mobileconfig 里的 PayloadIdentifier/PayloadUUID 改写成按 configFile 派生的值。
// conf 下各 app 的模板是互相复制出来的,标识符完全相同,而 iOS 按顶层 PayloadIdentifier 判重:
// 相同即替换已安装的描述文件,用户装了第二个 app 第一个就没了。
// 按 configFile 派生可保证各 app 互不覆盖;同一 app 多次下载得到相同标识符,
// 重复安装只覆盖自己,不会在桌面堆出一排图标。
func uniqueProfileIdentity(data []byte, configFile string) []byte {
	if len(data) == 0 {
		return data
	}
	derive := func(i int) string {
		return uuid.NewSHA1(profileIDNamespace, []byte(fmt.Sprintf("%s#%d", configFile, i))).String()
	}

	n := 0
	data = rePayloadUUID.ReplaceAllFunc(data, func(m []byte) []byte {
		g := rePayloadUUID.FindSubmatch(m)
		v := derive(n)
		n++
		return []byte(string(g[1]) + v + string(g[3]))
	})

	// 第 i 个 PayloadIdentifier 与第 i 个 PayloadUUID 共用派生值,保留原前缀(luli. / com.apple.webClip.managed.)
	i := 0
	data = rePayloadIdent.ReplaceAllFunc(data, func(m []byte) []byte {
		g := rePayloadIdent.FindSubmatch(m)
		v := derive(i)
		i++
		val := g[2]
		if reUUIDValue.Match(val) {
			val = reUUIDValue.ReplaceAll(val, []byte(v))
		} else {
			val = []byte(string(val) + "." + v)
		}
		return []byte(string(g[1]) + string(val) + string(g[3]))
	})
	return data
}

func GetAppConfig(appId int32) (origin, target, config string) {
	endpoint := statg.GlobalAppIdEndpoints[appId]
	if endpoint != nil {
		origin = endpoint.H5Origin
		target = endpoint.H5Target
		config = endpoint.H5Config
	}
	return
}

// PageButtonClick  落地页点击下载返回最新的下载链接
func GetH5Config(ctx context.Context, req *proto.H5ConfigReq, userAgent string, ip string) ([]byte, string) {
	req.DC = utils.RepairDC(req.DC)
	downloadInfo := &downloadinfo.DownloadInfoModel{
		AppId:       req.AppId,
		IP:          ip,
		PC:          req.PC,
		DC:          req.DC,
		SysType:     "light",
		PackageType: versionMod.Light,
		PeerIP:      ip,
		Domain:      req.Domain,
		UserAgent:   userAgent,
		CreatedAt:   time.Now(),
	}
	cacheSer.Writers.LandPageClickWriter.Add(downloadInfo)
	origin, target, config := GetAppConfig(req.AppId)
	log.Info("GetH5Config", log.Any("origin", origin), log.Any("target", target))
	if origin == "" || target == "" || config == "" {
		return nil, "madou.mobileconfig"
	}
	return GenerateConfigFile(origin, target, config, req.DC, req.PC)
}

func readFile(filePath string, origin, target string) ([]byte, bool, error) {
	var err error
	var data []byte
	cacheKey := fmt.Sprintf("h5config#%s", filePath)
	if cache, exists := cacheSer.Cache.Get(cacheKey); exists {
		if item, ok := cache.([]byte); ok {
			data = item
		}
	}
	if data == nil {
		data, err = os.ReadFile(filePath)
		if err != nil {
			return nil, false, err
		}
		cacheSer.Cache.Set(cacheKey, data, 0)
	}

	reader := bufio.NewReader(bytes.NewReader(data))
	needHandle := false
	output := make([]byte, 0)
	for {
		line, _, err := reader.ReadLine()
		if err != nil {
			if err == io.EOF {
				return output, needHandle, nil
			}
			return nil, needHandle, err
		}
		if ok, _ := regexp.Match(origin, line); ok {
			reg := regexp.MustCompile(origin)
			newByte := reg.ReplaceAll(line, []byte(target))
			output = append(output, newByte...)
			output = append(output, []byte("\n")...)
			if !needHandle {
				needHandle = true
			}
		} else {
			output = append(output, line...)
			output = append(output, []byte("\n")...)
		}
	}
	return output, needHandle, nil
}

func GetH5ConfigV2(ctx context.Context, req *proto.H5ConfigReq, ip string) proto.H5ConfigV2Resp {
	if req.AppId == 694 {
		return proto.H5ConfigV2Resp{
			URL: "http://awll.yangjiaolian.top/91seman.mobileconfig",
		}
	}

	return proto.H5ConfigV2Resp{}
}