package appser

import (
	"bytes"
	"context"
	"encoding/json"
	"net/url"
	"strings"
	"sync"
	"videoweb/app/api/proto"
	"videoweb/app/service/configser"
	"videoweb/pub/common/http"
	"videoweb/pub/common/log"
	"videoweb/pub/common/netutil"
	"videoweb/pub/pubdef"
	"videoweb/pub/storage/proxy"

	"github.com/robfig/cron/v3"
)

const (
	appListAPIPath = "/media/web/appinfo/applist"
)

var jsonHeader = map[string]string{"Content-Type": "application/json"}

var (
	appListCron  *cron.Cron
	appListCache struct {
		lock         sync.RWMutex
		appList      []proto.AppCategoryInfo
		categoryMaps map[int64]proto.AppCategoryInfo
	}
)

type remoteAppListResp struct {
	Code int `json:"code"`
	Data struct {
		List []proto.AppCategoryInfo `json:"list"`
	} `json:"data"`
}

// Start 启动定时刷新应用列表缓存（每10分钟一次）
func Start() {
	appListCron = cron.New(cron.WithSeconds())
	UpdateAppListCache(context.Background())
	_, _ = appListCron.AddFunc("0 */10 * * * ?", func() {
		UpdateAppListCache(context.Background())
	})
	appListCron.Start()
}

// GetAppListCache 返回全部应用分类列表（带各分类下应用）
func GetAppListCache() []proto.AppCategoryInfo {
	appListCache.lock.RLock()
	defer appListCache.lock.RUnlock()
	if len(appListCache.appList) == 0 {
		return make([]proto.AppCategoryInfo, 0)
	}
	result := make([]proto.AppCategoryInfo, len(appListCache.appList))
	copy(result, appListCache.appList)
	return result
}

// GetCategoryCache 按分类ID返回单个分类（含应用列表）；categoryId=0 返回第一个分类
func GetCategoryCache(categoryId int64) proto.AppCategoryInfo {
	appListCache.lock.RLock()
	defer appListCache.lock.RUnlock()
	if categoryId == 0 && len(appListCache.appList) > 0 {
		return appListCache.appList[0]
	}
	if v, ok := appListCache.categoryMaps[categoryId]; ok {
		return v
	}
	return proto.AppCategoryInfo{AppList: make([]proto.AppInfoData, 0)}
}

// UpdateAppListCache 从远端拉取应用列表并刷新内存缓存
func UpdateAppListCache(ctx context.Context) {
	domain := proxy.DomainAddressRepair("", proxy.BucketVideoAddressV2)
	apiURL := strings.TrimSuffix(domain, "/") + appListAPIPath

	reqBody, _ := json.Marshal(map[string]string{"dc": "dc"})
	resp, err := http.Post(apiURL, jsonHeader, bytes.NewReader(reqBody))
	if err != nil {
		log.Warn("UpdateAppListCache http.Post failed", log.Any("url", apiURL), log.E(err))
		return
	}

	var remote remoteAppListResp
	if err = json.Unmarshal(resp.Data, &remote); err != nil {
		log.Warn("UpdateAppListCache unmarshal failed", log.Any("url", apiURL), log.E(err))
		return
	}
	if remote.Code != 200 {
		log.Warn("UpdateAppListCache bad code", log.Any("url", apiURL), log.Any("code", remote.Code))
		return
	}

	config := configser.GetConfigInfo()
	advitise := configser.GetAdvitise()
	channelCode := config.ChannelCode
	selfAppName := strings.TrimSpace(config.WebSiteName)

	categoryMaps := make(map[int64]proto.AppCategoryInfo)
	var appList []proto.AppCategoryInfo

	for _, category := range remote.Data.List {
		var apps []proto.AppInfoData
		for _, app := range category.AppList {
			if selfAppName != "" && strings.HasPrefix(app.Name, selfAppName) {
				continue
			}
			apps = append(apps, proto.AppInfoData{
				Id:          app.Id,
				CategoryId:  app.CategoryId,
				Name:        app.Name,
				Intro:       app.Intro,
				Description: app.Description,
				Logo:        netutil.MergeURL(config.ImgCdn, app.Logo),
				Url:         appendChannelCode(app.Url, channelCode),
				Sort:        app.Sort,
			})
		}
		// 广告位 A（code=12）
		if category.Code == 12 {
			for _, ad := range advitise.AppInfoAList {
				apps = append(apps, proto.AppInfoData{
					AdvitiseId: ad.Id,
					CategoryId: category.Id,
					Name:       ad.Title,
					Logo:       netutil.MergeURL(config.ImgCdn, ad.Images),
					Url:        ad.Link,
					Location:   ad.Location,
				})
			}
		}
		// 广告位 B（code=13）
		if category.Code == 13 {
			for _, ad := range advitise.AppInfoBList {
				apps = append(apps, proto.AppInfoData{
					AdvitiseId: ad.Id,
					CategoryId: category.Id,
					Name:       ad.Title,
					Logo:       netutil.MergeURL(config.ImgCdn, ad.Images),
					Url:        ad.Link,
					Location:   ad.Location,
				})
			}
		}
		if len(apps) == 0 {
			continue
		}
		category.AppList = apps
		categoryMaps[category.Id] = proto.AppCategoryInfo{
			Id:    category.Id,
			Title: category.Title,
			Intro: category.Intro,
			Sort:  category.Sort,
			Code:  category.Code,
		}
		appList = append(appList, category)
	}

	appListCache.lock.Lock()
	appListCache.appList = appList
	appListCache.categoryMaps = categoryMaps
	appListCache.lock.Unlock()
}

// appendChannelCode 为应用 URL 拼接渠道码参数 dc=xxx；已含 dc 参数则不再拼接
func appendChannelCode(rawURL, channelCode string) string {
	if len(channelCode) == 0 {
		channelCode = pubdef.DefaultChannelCode
	}

	rawURL = strings.TrimSpace(rawURL)
	channelCode = strings.TrimSpace(channelCode)
	if rawURL == "" || channelCode == "" {
		return rawURL
	}

	parsed, err := url.Parse(rawURL)
	if err != nil {
		return rawURL
	}

	query := parsed.Query()
	if query.Has("dc") {
		return parsed.String()
	}

	query.Set("dc", channelCode)
	parsed.RawQuery = query.Encode()
	return parsed.String()
}