package cpcDownloadCfgSer

import (
	"context"
	"fmt"
	"stat/api/proto"
	"stat/common/genId"
	"stat/common/log"
	"stat/models/cpcDownloadCfg"
	"stat/service/cacheSer"
	"time"

	"go.mongodb.org/mongo-driver/bson"
	"go.mongodb.org/mongo-driver/mongo/options"
)

const (
	cacheTTL = 2 * time.Minute
)

func cacheKey(appId int32, channel string) string {
	return fmt.Sprintf("cpc_download_cfg#%d#%s", appId, channel)
}

// findEnabled 按 (appId, channel) 命中启用的配置;命中缓存(包含未找到的负缓存)
func findEnabled(ctx context.Context, appId int32, channel string) *cpcDownloadCfg.CpcDownloadCfg {
	key := cacheKey(appId, channel)
	if v, ok := cacheSer.Cache.Get(key); ok {
		if doc, ok := v.(*cpcDownloadCfg.CpcDownloadCfg); ok {
			return doc
		}
		// 负缓存
		return nil
	}
	filter := bson.M{
		cpcDownloadCfg.FN.CpcDownloadCfg.AppId:   appId,
		cpcDownloadCfg.FN.CpcDownloadCfg.Channel: channel,
		cpcDownloadCfg.FN.CpcDownloadCfg.Status:  true,
	}
	doc, err := cpcDownloadCfg.FindOneCpcDownloadCfg(ctx, filter)
	if err != nil {
		// 写入负缓存,避免高频未命中击穿
		cacheSer.Cache.Set(key, false, cacheTTL)
		return nil
	}
	cacheSer.Cache.Set(key, doc, cacheTTL)
	return doc
}

// GetLandingPage 按 appId+channel 获取 iOS 落地页 URL,无配置返回空字符串
func GetLandingPage(ctx context.Context, appId int32, channel string) string {
	if doc := findEnabled(ctx, appId, channel); doc != nil {
		return doc.LandingPage
	}
	return ""
}

// GetDownloadUrl 按 appId+channel 获取 Android 下载地址,无配置返回空字符串
func GetDownloadUrl(ctx context.Context, appId int32, channel string) string {
	if doc := findEnabled(ctx, appId, channel); doc != nil {
		return doc.DownloadUrl
	}
	return ""
}

// GetIosDownSuff 按 appId+channel 获取 mobileconfig 文件名
func GetIosDownSuff(ctx context.Context, appId int32, channel string) string {
	if doc := findEnabled(ctx, appId, channel); doc != nil {
		return doc.IosDownSuff
	}
	return ""
}

func invalidateCache(appId int32, channel string) {
	cacheSer.Cache.Delete(cacheKey(appId, channel))
}

// List 后台列表
func List(ctx context.Context, req *proto.CpcDownloadCfgListReq) (*proto.CpcDownloadCfgListResp, error) {
	resp := &proto.CpcDownloadCfgListResp{
		Total: 0,
		List:  make(cpcDownloadCfg.CpcDownloadCfgList, 0),
	}
	filter := bson.M{}
	if req.AppId != nil {
		filter[cpcDownloadCfg.FN.CpcDownloadCfg.AppId] = *req.AppId
	}
	if req.Channel != "" {
		filter[cpcDownloadCfg.FN.CpcDownloadCfg.Channel] = req.Channel
	}
	if req.Status != nil {
		filter[cpcDownloadCfg.FN.CpcDownloadCfg.Status] = *req.Status
	}

	total, err := cpcDownloadCfg.CountCpcDownloadCfgs(ctx, filter)
	if err != nil {
		return nil, err
	}
	opt := &options.FindOptions{}
	opt.SetSort(bson.D{{Key: cpcDownloadCfg.FN.CpcDownloadCfg.CreatedAt, Value: -1}})
	opt.SetSkip((req.PageNum - 1) * req.PageSize)
	opt.SetLimit(req.PageSize)
	list, err := cpcDownloadCfg.FindManyCpcDownloadCfg(ctx, filter, opt)
	if err != nil {
		return nil, err
	}
	resp.Total = total
	resp.List = list
	return resp, nil
}

// Add 新增
func Add(ctx context.Context, req *proto.AddCpcDownloadCfgReq) error {
	now := time.Now()
	doc := &cpcDownloadCfg.CpcDownloadCfg{
		Id:          genId.GetCpcDownloadCfgId(),
		AppId:       req.AppId,
		Channel:     req.Channel,
		LandingPage: req.LandingPage,
		DownloadUrl: req.DownloadUrl,
		IosDownSuff: req.IosDownSuff,
		Remark:      req.Remark,
		Status:      req.Status,
		CreatedAt:   now,
		UpdatedAt:   now,
	}
	if err := cpcDownloadCfg.InsertOneCpcDownloadCfg(ctx, doc); err != nil {
		return err
	}
	invalidateCache(doc.AppId, doc.Channel)
	return nil
}

// Update 更新
func Update(ctx context.Context, req *proto.UpdateCpcDownloadCfgReq) error {
	old, err := cpcDownloadCfg.FindOneCpcDownloadCfg(ctx, bson.M{
		cpcDownloadCfg.FN.CpcDownloadCfg.Id: req.Id,
	})
	if err != nil {
		return err
	}
	set := bson.M{
		cpcDownloadCfg.FN.CpcDownloadCfg.UpdatedAt: time.Now(),
	}
	if req.AppId != nil {
		set[cpcDownloadCfg.FN.CpcDownloadCfg.AppId] = *req.AppId
	}
	if req.Channel != nil {
		set[cpcDownloadCfg.FN.CpcDownloadCfg.Channel] = *req.Channel
	}
	if req.LandingPage != nil {
		set[cpcDownloadCfg.FN.CpcDownloadCfg.LandingPage] = *req.LandingPage
	}
	if req.DownloadUrl != nil {
		set[cpcDownloadCfg.FN.CpcDownloadCfg.DownloadUrl] = *req.DownloadUrl
	}
	if req.IosDownSuff != nil {
		set[cpcDownloadCfg.FN.CpcDownloadCfg.IosDownSuff] = *req.IosDownSuff
	}
	if req.Remark != nil {
		set[cpcDownloadCfg.FN.CpcDownloadCfg.Remark] = *req.Remark
	}
	if req.Status != nil {
		set[cpcDownloadCfg.FN.CpcDownloadCfg.Status] = *req.Status
	}
	if err := cpcDownloadCfg.UpdateOneCpcDownloadCfg(ctx, bson.M{
		cpcDownloadCfg.FN.CpcDownloadCfg.Id: req.Id,
	}, bson.M{"$set": set}); err != nil {
		return err
	}
	// 同时清空旧 key 与新 key
	invalidateCache(old.AppId, old.Channel)
	if req.AppId != nil || req.Channel != nil {
		newAppId := old.AppId
		newChannel := old.Channel
		if req.AppId != nil {
			newAppId = *req.AppId
		}
		if req.Channel != nil {
			newChannel = *req.Channel
		}
		invalidateCache(newAppId, newChannel)
	}
	return nil
}

// Del 删除
func Del(ctx context.Context, id int64) error {
	old, err := cpcDownloadCfg.FindOneCpcDownloadCfg(ctx, bson.M{
		cpcDownloadCfg.FN.CpcDownloadCfg.Id: id,
	})
	if err != nil {
		log.Warn("cpcDownloadCfg Del FindOne failed", log.E(err))
	}
	if _, err := cpcDownloadCfg.DelOneCpcDownloadCfg(ctx, bson.M{
		cpcDownloadCfg.FN.CpcDownloadCfg.Id: id,
	}); err != nil {
		return err
	}
	if old != nil {
		invalidateCache(old.AppId, old.Channel)
	}
	return nil
}