package main

import (
	"bufio"
	"context"
	"fmt"
	"os"
	"path/filepath"
	"strconv"
	"strings"
	"sync"
	"time"

	"github.com/golang/freetype/truetype"

	"douyu_go/internal/activity"
	"douyu_go/internal/client"
	"douyu_go/internal/config"
	"douyu_go/internal/constants"
	imgpkg "douyu_go/internal/image"
	"douyu_go/internal/logger"
	"douyu_go/internal/seckill"
	"douyu_go/internal/trace"
	"douyu_go/internal/types"
	"douyu_go/internal/utils"
)

// App 应用主结构体，所有导出方法可被前端通过 Wails 绑定调用。
type App struct {
	ctx context.Context

	clientMu  sync.RWMutex
	client    *client.DouyuClient
	scheduler *seckill.Scheduler
	logStore  *logger.MemoryLogStore
	trace     *trace.Recorder
	paths     types.AppPaths
	font      *truetype.Font

	cfgMu sync.RWMutex
	cfg   types.Config

	productsMu sync.RWMutex
	products   []types.Product
	productsAt time.Time

	closeLog   func()
	closeTrace func()
}

const exchangeLookupConcurrency = 8

// getClient 返回当前 client 指针快照（读锁保护）。
func (a *App) getClient() *client.DouyuClient {
	a.clientMu.RLock()
	defer a.clientMu.RUnlock()
	return a.client
}

// getCfg 返回当前配置的深拷贝（读锁保护）。
func (a *App) getCfg() types.Config {
	a.cfgMu.RLock()
	defer a.cfgMu.RUnlock()
	return cloneConfig(a.cfg)
}

// setClient 替换 client（写锁保护）。
func (a *App) setClient(c *client.DouyuClient) {
	a.clientMu.Lock()
	a.client = c
	a.clientMu.Unlock()
}

// setCfg 替换配置（写锁保护）。
func (a *App) setCfg(c types.Config) {
	a.cfgMu.Lock()
	a.cfg = c
	a.cfgMu.Unlock()
}

// cloneConfig 深拷贝配置，避免 RetryStages 切片共享引用。
func cloneConfig(c types.Config) types.Config {
	cp := c
	if c.RetryStages != nil {
		cp.RetryStages = make([]types.RetryStage, len(c.RetryStages))
		copy(cp.RetryStages, c.RetryStages)
	}
	return cp
}

type exchangeLookupResult struct {
	Account     types.Account
	Records     []types.ExchangeRecord
	Err         error
	EmptyCookie bool
}

// NewApp 创建 App 实例。
func NewApp() *App {
	return &App{}
}

// startup Wails 应用启动时调用。
func (a *App) startup(ctx context.Context) {
	a.ctx = ctx

	a.paths = config.DefaultAppPaths()
	a.logStore = logger.NewMemoryLogStore(800)
	a.closeLog = logger.InitLogging(a.logStore, a.paths.LogDir)

	// 加载配置并应用运行时设置
	a.cfg = config.LoadConfig(a.paths.ConfigFile)
	logger.SetMinLevel(a.cfg.LogLevel)

	traceCfg := types.TraceConfig{
		Enabled:      a.cfg.TraceEnabled,
		MaxBodyBytes: a.cfg.TraceMaxBody,
	}
	tr, closeTrace := trace.InitTrace(a.paths.LogDir, traceCfg)
	a.trace = tr
	a.closeTrace = closeTrace

	// 解析当前活动：配置中的 activity ID 决定使用哪套接口参数
	act := activity.Get(a.cfg.Activity)
	if act == nil {
		act = activity.Default()
		logger.LogEvent("活动", "warn", "配置中的活动 %q 未识别，已回退到默认活动 %s", a.cfg.Activity, act.DisplayName)
	}
	a.client = client.New(act, a.cfg.TimeAPIURL, a.trace)
	a.font = imgpkg.LoadFont(a.paths.FontFiles)
	a.scheduler = seckill.New(a.client, a.paths, a.font, a.cfg.Concurrency, a.cfg.Attempts, a.cfg.RetryStages, a.cfg.SeckillMode)
	a.scheduler.LoadAccounts()

	if err := os.MkdirAll(a.paths.SuccessDir, 0755); err != nil {
		logger.LogEvent("图片", "warn", "成功图片目录创建失败，图片保存功能可能不可用: %v", err)
	}

	if sample, err := a.client.ServerTimeSample(); err == nil {
		logger.SetDouyuOffset(sample.Offset)
		logger.LogEvent("时间", "success", "服务端时间获取成功: %s", sample.EstimatedServerNow().In(constants.CST).Format("2006-01-02 15:04:05.000"))
	} else {
		logger.LogEvent("时间", "error", "服务端时间获取失败: %v", err)
	}

	logger.LogEvent("系统", "success", "应用启动完成 | 账号: %d", a.scheduler.AccountCount())
}

// shutdown Wails 应用关闭时调用。
func (a *App) shutdown(ctx context.Context) {
	if a.scheduler != nil {
		a.scheduler.Close()
	}
	if a.closeTrace != nil {
		a.closeTrace()
	}
	if a.closeLog != nil {
		a.closeLog()
	}
}

// ==================== 前端可调用方法 ====================

// LoadProducts 刷新商品列表。refresh=true 时从斗鱼实时拉取。
func (a *App) LoadProducts(refresh bool) types.ProductPayload {
	if refresh {
		products, err := a.getClient().Products()
		if err != nil {
			logger.LogEvent("商品", "error", "商品刷新失败: %v", err)
			return types.ProductPayload{Success: false}
		}
		fetchedAt := time.Now()
		a.setProducts(products, fetchedAt)
		logger.LogEvent("商品", "success", "商品刷新完成: %d 个，刷新时间=%s", len(products), fetchedAt.In(constants.CST).Format("15:04:05.000"))
		return a.productPayload("live")
	}
	return a.productPayload("cache")
}

// GetAccounts 返回账号列表。
func (a *App) GetAccounts() []types.AccountView {
	accounts := a.scheduler.AccountSnapshot()
	list := make([]types.AccountView, 0, len(accounts))
	for i, account := range accounts {
		list = append(list, types.AccountView{
			Index:  i,
			Name:   account.Name,
			Cookie: utils.MaskCookie(account.Cookie),
		})
	}
	return list
}

// ReloadAccounts 重新加载账号文件。
func (a *App) ReloadAccounts() types.ReloadAccountsResult {
	a.scheduler.LoadAccounts()
	return types.ReloadAccountsResult{Success: true, Count: a.scheduler.AccountCount()}
}

// StartSeckill 立即启动抢购。
func (a *App) StartSeckill(accountProducts map[string]string) types.MessageResult {
	if len(accountProducts) == 0 {
		return types.MessageResult{Error: "请选择账号和商品"}
	}
	if !a.scheduler.TryStartRun() {
		return types.MessageResult{Error: "抢购任务正在运行，请勿重复提交"}
	}
	go a.scheduler.RunNow(utils.CloneStringMap(accountProducts))
	return types.MessageResult{Success: true, Msg: "抢购已启动"}
}

// SetSchedule 设置定时抢购。
func (a *App) SetSchedule(req types.SeckillRequest) (types.ScheduleResult, error) {
	return a.scheduler.ScheduleRun(req)
}

// CancelSchedule 取消未触发的定时抢购。
func (a *App) CancelSchedule() types.CancelScheduleResult {
	stopped := a.scheduler.CancelSchedule()
	return types.CancelScheduleResult{Success: true, Stopped: stopped}
}

// GetResults 返回当前抢购结果。
func (a *App) GetResults() map[string]string {
	return a.scheduler.Results()
}

// GetLogs 返回后端内存日志，支持增量获取。
func (a *App) GetLogs(since int64) types.LogsResult {
	entries := a.logStore.Since(since)
	nextSince := since
	if len(entries) > 0 {
		nextSince = entries[len(entries)-1].ID
	}
	return types.LogsResult{
		Success: true,
		Logs:    entries,
		Since:   nextSince,
		File:    a.logStore.FilePath(),
	}
}

// GetTime 返回服务端时间和本地时间。
func (a *App) GetTime() types.TimeResult {
	serverTime, err := a.getClient().ServerTime()
	source := "currentTime"
	if err != nil {
		source = "localFallback"
		logger.LogEvent("时间", "warn", "时间接口降级: %v", err)
	}
	return types.TimeResult{
		ServerTime: serverTime.In(constants.CST).Format("2006-01-02 15:04:05.000"),
		LocalTime:  time.Now().In(constants.CST).Format("2006-01-02 15:04:05.000"),
		Source:     source,
	}
}

// ClearResults 清空抢购结果。
func (a *App) ClearResults() types.SimpleResult {
	a.scheduler.ClearResults()
	return types.SimpleResult{Success: true}
}

// QueryScore 查询单个账号的积分。
func (a *App) QueryScore(accountName string) types.ScoreResult {
	if accountName == "" {
		return types.ScoreResult{Score: "缺少账号名"}
	}
	cookie, ok := a.scheduler.AccountCookieByName(accountName)
	if !ok || cookie == "" {
		return types.ScoreResult{Score: fmt.Sprintf("账号不存在或 Cookie 为空: %s", accountName)}
	}
	score, err := a.getClient().Score(cookie)
	if err != nil {
		return types.ScoreResult{Score: "查询失败: " + err.Error()}
	}
	return types.ScoreResult{Score: strconv.Itoa(score)}
}

// VerifyExchange 查询兑换记录，用于复验抢购结果。
func (a *App) VerifyExchange(accountName string) types.ExchangeRecordsResult {
	if accountName == "" {
		return types.ExchangeRecordsResult{Error: "缺少账号名"}
	}
	cookie, ok := a.scheduler.AccountCookieByName(accountName)
	if !ok || cookie == "" {
		return types.ExchangeRecordsResult{Error: fmt.Sprintf("账号不存在或 Cookie 为空: %s", accountName)}
	}

	records, err := a.getClient().ExchangeList(cookie)
	if err != nil {
		return types.ExchangeRecordsResult{Error: "查询失败: " + err.Error()}
	}
	matched := filterExchangeRecords(records)

	return types.ExchangeRecordsResult{
		Success: true,
		Records: matched,
		Count:   len(matched),
	}
}

// VerifyAllExchange 批量查询兑换记录，使用有限并发减少等待时间。
func (a *App) VerifyAllExchange() types.VerifyAllExchangeResult {
	accounts := a.scheduler.AccountSnapshot()
	results := make(map[string]types.AccountExchangeResult)
	lookups := a.lookupExchangeRecords("复验", accounts)

	for _, lookup := range lookups {
		if lookup.EmptyCookie {
			results[lookup.Account.Name] = types.AccountExchangeResult{Error: "Cookie 为空"}
			continue
		}

		if lookup.Err != nil {
			results[lookup.Account.Name] = types.AccountExchangeResult{Error: "查询失败: " + lookup.Err.Error()}
			continue
		}

		matched := filterExchangeRecords(lookup.Records)
		results[lookup.Account.Name] = types.AccountExchangeResult{
			Success: true,
			Records: matched,
			Count:   len(matched),
		}
	}

	return types.VerifyAllExchangeResult{Results: results}
}

// VerifyAndExport 复验并导出结果。
func (a *App) VerifyAndExport(commodityID string) types.VerifyAndExportResult {
	accounts := a.scheduler.AccountSnapshot()
	results := make(map[string]types.AccountHitResult)
	hitAccounts := make([]string, 0)
	missAccounts := make([]string, 0)
	lookups := a.lookupExchangeRecords("复验", accounts)

	for _, lookup := range lookups {
		if lookup.EmptyCookie {
			missAccounts = append(missAccounts, lookup.Account.Name)
			results[lookup.Account.Name] = types.AccountHitResult{Error: "Cookie 为空"}
			continue
		}

		if lookup.Err != nil {
			missAccounts = append(missAccounts, lookup.Account.Name)
			results[lookup.Account.Name] = types.AccountHitResult{Error: "查询失败: " + lookup.Err.Error()}
			continue
		}

		// 检查是否抢到了指定商品
		hit := hasCommodityRecord(lookup.Records, commodityID, 0, 0)
		if hit {
			hitAccounts = append(hitAccounts, lookup.Account.Name)
			results[lookup.Account.Name] = types.AccountHitResult{Success: true, Hit: true}
		} else {
			missAccounts = append(missAccounts, lookup.Account.Name)
			results[lookup.Account.Name] = types.AccountHitResult{Success: true}
		}
	}

	return types.VerifyAndExportResult{
		Success:      true,
		HitCount:     len(hitAccounts),
		MissCount:    len(missAccounts),
		HitAccounts:  hitAccounts,
		MissAccounts: missAccounts,
		Details:      results,
	}
}

func (a *App) lookupExchangeRecords(category string, accounts []types.Account) []exchangeLookupResult {
	results := make([]exchangeLookupResult, len(accounts))
	if len(accounts) == 0 {
		return results
	}

	workerCount := exchangeLookupConcurrency
	if len(accounts) < workerCount {
		workerCount = len(accounts)
	}
	start := time.Now()
	logger.LogEvent(category, "info", "兑换记录批量查询开始: 账号=%d 并发=%d", len(accounts), workerCount)

	jobs := make(chan int)
	var wg sync.WaitGroup
	for worker := 0; worker < workerCount; worker++ {
		wg.Add(1)
		go func() {
			defer wg.Done()
			for idx := range jobs {
				account := accounts[idx]
				lookup := exchangeLookupResult{Account: account}
				if strings.TrimSpace(account.Cookie) == "" {
					lookup.EmptyCookie = true
					results[idx] = lookup
					continue
				}
				records, err := a.getClient().ExchangeList(account.Cookie)
				lookup.Records = records
				lookup.Err = err
				results[idx] = lookup
			}
		}()
	}
	for idx := range accounts {
		jobs <- idx
	}
	close(jobs)
	wg.Wait()

	errors := 0
	empty := 0
	for _, result := range results {
		if result.EmptyCookie {
			empty++
		}
		if result.Err != nil {
			errors++
		}
	}
	level := "success"
	if errors > 0 {
		level = "warn"
	}
	logger.LogEvent(category, level, "兑换记录批量查询完成: 账号=%d 空CK=%d 失败=%d 耗时=%s",
		len(accounts), empty, errors, time.Since(start).Round(time.Millisecond))
	return results
}

func filterExchangeRecords(records []types.ExchangeRecord) []types.ExchangeRecord {
	matched := make([]types.ExchangeRecord, 0, len(records))
	for _, r := range records {
		if r.CommodityID != "" {
			matched = append(matched, r)
		}
	}
	return matched
}

func hasCommodityRecord(records []types.ExchangeRecord, commodityID string, startTime, endTime int64) bool {
	if commodityID == "" {
		return false
	}
	for _, r := range records {
		if r.CommodityID != commodityID {
			continue
		}
		if startTime == 0 && endTime == 0 {
			return true
		}
		recordTime, err := strconv.ParseInt(r.Time, 10, 64)
		if err != nil {
			continue
		}
		if startTime > 0 && recordTime < startTime {
			continue
		}
		if endTime > 0 && recordTime > endTime {
			continue
		}
		return true
	}
	return false
}

// accountLine 账号文件的一行解析结果。
type accountLine struct {
	Raw     string // 原始行文本
	Name    string // 解析出的账号名（注释/空行为空）
	Comment bool   // 是否为注释或空行
}

// parseAccountFile 读取账号文件并按行解析账号名。
func parseAccountFile(path string) ([]accountLine, error) {
	data, err := os.ReadFile(path)
	if err != nil {
		return nil, err
	}
	var lines []accountLine
	scanner := bufio.NewScanner(strings.NewReader(string(data)))
	for scanner.Scan() {
		raw := scanner.Text()
		trimmed := strings.TrimSpace(raw)
		if trimmed == "" || strings.HasPrefix(trimmed, "#") {
			lines = append(lines, accountLine{Raw: raw, Comment: true})
			continue
		}
		name := ""
		if parts := strings.SplitN(trimmed, "----", 3); len(parts) >= 1 {
			name = strings.TrimSpace(parts[0])
		}
		lines = append(lines, accountLine{Raw: raw, Name: name})
	}
	return lines, scanner.Err()
}

// ExportAccounts 导出指定账号到文件。
func (a *App) ExportAccounts(accountNames []string, filename string) types.ExportAccountsResult {
	if len(accountNames) == 0 {
		return types.ExportAccountsResult{Error: "没有要导出的账号"}
	}

	accountFile := a.scheduler.AccountFilePath()
	lines, err := parseAccountFile(accountFile)
	if err != nil {
		return types.ExportAccountsResult{Error: "读取账号文件失败: " + err.Error()}
	}

	nameSet := make(map[string]bool)
	for _, name := range accountNames {
		nameSet[name] = true
	}

	var matchedLines []string
	for _, line := range lines {
		if line.Comment {
			continue
		}
		if nameSet[line.Name] {
			matchedLines = append(matchedLines, line.Raw)
		}
	}

	if len(matchedLines) == 0 {
		return types.ExportAccountsResult{Error: "没有找到匹配的账号行"}
	}

	// 生成导出文件路径
	exportPath := filepath.Join(filepath.Dir(accountFile), filename)
	content := strings.Join(matchedLines, "\n") + "\n"

	if err := os.WriteFile(exportPath, []byte(content), 0644); err != nil {
		return types.ExportAccountsResult{Error: "写入文件失败: " + err.Error()}
	}

	logger.LogEvent("导出", "success", "已导出 %d 个账号到: %s", len(matchedLines), exportPath)

	return types.ExportAccountsResult{
		Success:  true,
		Count:    len(matchedLines),
		FilePath: exportPath,
	}
}

// ExportAccountsWithProduct 导出指定账号到文件，自动使用中文商品名和时间戳命名。
func (a *App) ExportAccountsWithProduct(accountNames []string, commodityID, commodityName string) types.ExportAccountsResult {
	// 生成文件名: user_已抢到_商品中文名_20260626_150405.txt
	now := time.Now()
	timestamp := now.Format("20060102_150405")
	// 清理商品名中的特殊字符（复用 utils.SafeFilename，避免与 utils 包重复实现）
	safeName := utils.SafeFilename(commodityName)
	filename := fmt.Sprintf("user_已抢到_%s_%s.txt", safeName, timestamp)

	return a.ExportAccounts(accountNames, filename)
}

// OrganizeAccounts 整理账号，把已抢到指定商品的账号分离出来。
func (a *App) OrganizeAccounts(commodityID, commodityName string, startTime, endTime int64) types.OrganizeAccountsResult {
	accounts := a.scheduler.AccountSnapshot()
	hitAccounts := make([]string, 0)
	missAccounts := make([]string, 0)
	lookups := a.lookupExchangeRecords("整理", accounts)

	for _, lookup := range lookups {
		if lookup.EmptyCookie || lookup.Err != nil {
			missAccounts = append(missAccounts, lookup.Account.Name)
			continue
		}

		if hasCommodityRecord(lookup.Records, commodityID, startTime, endTime) {
			hitAccounts = append(hitAccounts, lookup.Account.Name)
		} else {
			missAccounts = append(missAccounts, lookup.Account.Name)
		}
	}

	// 导出已抢到的账号
	var exportResult types.ExportAccountsResult
	if len(hitAccounts) > 0 {
		exportResult = a.ExportAccountsWithProduct(hitAccounts, commodityID, commodityName)
	}

	// 更新原文件，只保留未抢到的
	accountFile := a.scheduler.AccountFilePath()
	lines, err := parseAccountFile(accountFile)
	if err != nil {
		return types.OrganizeAccountsResult{Error: "读取账号文件失败: " + err.Error()}
	}

	missSet := make(map[string]bool)
	for _, name := range missAccounts {
		missSet[name] = true
	}

	var keepLines []string
	for _, line := range lines {
		if line.Comment {
			keepLines = append(keepLines, line.Raw)
			continue
		}
		if missSet[line.Name] {
			keepLines = append(keepLines, line.Raw)
		}
	}

	// 写回原文件
	newContent := strings.Join(keepLines, "\n") + "\n"
	if err := os.WriteFile(accountFile, []byte(newContent), 0644); err != nil {
		return types.OrganizeAccountsResult{Error: "更新账号文件失败: " + err.Error()}
	}

	// 重新加载账号
	a.scheduler.LoadAccounts()

	logger.LogEvent("整理", "success", "整理完成: 已抢到=%d, 未抢到=%d", len(hitAccounts), len(missAccounts))

	return types.OrganizeAccountsResult{
		Success:      true,
		HitCount:     len(hitAccounts),
		MissCount:    len(missAccounts),
		HitAccounts:  hitAccounts,
		MissAccounts: missAccounts,
		ExportResult: exportResult,
	}
}

// GetVersion 返回应用版本号。
func (a *App) GetVersion() string {
	if constants.BuildTime != "unknown" {
		return constants.Version + " (" + constants.BuildTime + ")"
	}
	return constants.Version
}

// GetActivities 返回所有已注册的手册活动，供前端下拉选择。
func (a *App) GetActivities() []types.ActivityInfo {
	list := activity.List()
	out := make([]types.ActivityInfo, 0, len(list))
	for _, act := range list {
		out = append(out, types.ActivityInfo{ID: act.ID, DisplayName: act.DisplayName})
	}
	return out
}

// GetCurrentActivity 返回当前生效的活动。
func (a *App) GetCurrentActivity() types.ActivityInfo {
	cli := a.getClient()
	act := cli.Activity
	return types.ActivityInfo{ID: act.ID, DisplayName: act.DisplayName}
}

// SwitchActivity 切换当前活动并持久化到配置；切换后重建客户端与时间基准。
func (a *App) SwitchActivity(id string) types.SwitchActivityResult {
	act := activity.Get(id)
	if act == nil {
		return types.SwitchActivityResult{Error: "未知活动: " + id}
	}
	cfg := a.getCfg()
	cfg.Activity = act.ID
	// 仅当用户未自定义时间校准接口时才回退默认值，避免切换活动静默覆盖用户在设置里填的 timeApiUrl。
	if cfg.TimeAPIURL == "" {
		cfg.TimeAPIURL = constants.DefaultTimeAPI
	}
	if err := config.SaveConfig(a.paths.ConfigFile, cfg); err != nil {
		logger.LogEvent("活动", "error", "切换活动配置保存失败: %v", err)
		return types.SwitchActivityResult{Error: "配置保存失败: " + err.Error()}
	}
	a.setCfg(cfg)
	newClient := client.New(act, cfg.TimeAPIURL, a.trace)
	a.setClient(newClient)
	if !a.scheduler.UpdateClient(newClient) {
		logger.LogEvent("活动", "warn", "抢购任务正在运行，调度器客户端将在下次抢购时生效")
	}
	if sample, err := newClient.ServerTimeSample(); err == nil {
		logger.SetDouyuOffset(sample.Offset)
	}
	logger.LogEvent("活动", "success", "已切换到活动: %s", act.DisplayName)
	return types.SwitchActivityResult{Success: true, Activity: act.ID, DisplayName: act.DisplayName}
}

// GetSettings 返回当前配置。
func (a *App) GetSettings() types.Config {
	return a.getCfg()
}

// SaveSettings 保存配置并运行时生效。
func (a *App) SaveSettings(cfg types.Config) types.SimpleResult {
	// 校验
	if cfg.Concurrency <= 0 {
		cfg.Concurrency = constants.DefaultConcurrency
	}
	if cfg.Attempts <= 0 {
		cfg.Attempts = constants.DefaultAttempts
	}
	if cfg.LogLevel == "" {
		cfg.LogLevel = "info"
	}

	// 写入文件
	if err := config.SaveConfig(a.paths.ConfigFile, cfg); err != nil {
		logger.LogEvent("配置", "error", "配置保存失败: %v", err)
		return types.SimpleResult{}
	}

	// 运行时生效
	a.setCfg(cfg)
	logger.SetMinLevel(cfg.LogLevel)
	a.scheduler.UpdateSettings(cfg.Concurrency, cfg.Attempts, cfg.RetryStages, cfg.SeckillMode)

	logger.LogEvent("配置", "success", "配置已保存并生效: 日志等级=%s 并发=%d 重试=%d 重试阶段=%d 模式=%d trace=%v",
		cfg.LogLevel, cfg.Concurrency, cfg.Attempts, len(cfg.RetryStages), cfg.SeckillMode, cfg.TraceEnabled)
	return types.SimpleResult{Success: true}
}

// ==================== 内部辅助方法 ====================

func (a *App) setProducts(products []types.Product, fetchedAt time.Time) {
	a.productsMu.Lock()
	a.products = products
	a.productsAt = fetchedAt
	a.productsMu.Unlock()
	if a.scheduler != nil {
		a.scheduler.UpdateProducts(products)
	}
}

func (a *App) productPayload(source string) types.ProductPayload {
	a.productsMu.RLock()
	defer a.productsMu.RUnlock()

	payload := types.ProductPayload{
		Success:  true,
		Source:   source,
		Products: a.products,
		Count:    len(a.products),
	}
	if !a.productsAt.IsZero() {
		age := time.Since(a.productsAt)
		if age < 0 {
			age = 0
		}
		payload.FetchedAt = a.productsAt.In(constants.CST).Format("2006-01-02 15:04:05.000")
		payload.AgeSecond = int(age.Seconds())
		payload.Stale = age > constants.ProductCacheTTL
	} else {
		payload.Stale = true
	}
	return payload
}