package versionApi

import (
	"net/http"
	"stat/common/stdLog"
	"stat/service/cpcDownloadCfgSer"
	"stat/service/versionSer"
	"strconv"
	"strings"

	"github.com/gin-gonic/gin"
)

// CpcDownload 双端下载
// @Tags 双端下载
// @Summary 双端下载
// @Description 记录下载历史。android:302跳转到下载地址(优先按appId+channel取配置,否则取最新);ios:返回mobileconfig配置文件
// @Produce octet-stream
// @Param appId path int true "产品AppId"
// @Param channel path string true "渠道(json字符串)"
// @Param tid query string false "埋点traceID"
// @Success 200 {file} file "ios返回mobileconfig文件"
// @Success 302 {string} string "android跳转下载地址"
// @Failure 400 {string} string "失败"
// @Router /rsdownload/{appId}/{channel} [get]
func CpcDownload(ctx *gin.Context) {
	// 第一个参数 appId
	appId, err := strconv.Atoi(ctx.Param("appId"))
	if err != nil {
		stdLog.ServerJSON(ctx, stdLog.ParamError, err.Error())
		return
	}
	// 第二个参数 channel(渠道，json字符串)
	channel := ctx.Param("channel")

	userAgent := ctx.Request.Header.Get("User-Agent")
	isIos := strings.Contains(userAgent, "iPhone") || strings.Contains(userAgent, "iPad")

	// 记录下载历史(双端都记)
	versionSer.RecordCpcDownload(ctx, isIos, int32(appId), channel, ctx.ClientIP(), userAgent)

	// ios: 优先按appId和渠道查询双端配置的落地页,配置了落地页则301跳转,否则返回mobileconfig配置文件
	if isIos {
		landingPage := cpcDownloadCfgSer.GetLandingPage(ctx, int32(appId), channel)
		if len(landingPage) > 0 {
			// 落地页未带dc参数时,拼上当前渠道
			if !strings.Contains(landingPage, "dc=") {
				if strings.Contains(landingPage, "?") {
					landingPage = landingPage + "&dc=" + channel
				} else {
					landingPage = landingPage + "?dc=" + channel
				}
			}
			ctx.Redirect(http.StatusMovedPermanently, landingPage)
			return
		}
		cfg := versionSer.IosMobileconfigByAppId(int32(appId))
		if cfg == nil {
			stdLog.ServerJSON(ctx, stdLog.Failure, "ios config不存在")
			return
		}
		pc, dc, _ := versionSer.ParseChannel(channel)
		writeMobileconfig(ctx, cfg, dc, pc)
		return
	}

	// android: 优先按appId和channel查询配置的下载链接，没有则使用默认最新下载地址
	downloadUrl := cpcDownloadCfgSer.GetDownloadUrl(ctx, int32(appId), channel)
	if downloadUrl == "" {
		downloadUrl = versionSer.LatestAndroidDownloadUrl(int32(appId))
	}
	if downloadUrl == "" {
		stdLog.ServerJSON(ctx, stdLog.Failure, "android下载地址不存在")
		return
	}
	ctx.Redirect(http.StatusFound, downloadUrl)
}

// writeMobileconfig 将 mobileconfig 文件以附件形式写入响应
func writeMobileconfig(ctx *gin.Context, cfg *versionSer.IosMobileconfigCfg, dc, pc string) {
	data, fileName := versionSer.BuildMobileconfig(cfg, dc, pc)
	if fileName == "" {
		fileName = "madou.mobileconfig"
	}
	ctx.Header("Content-Type", "application/octet-stream")
	ctx.Header("Content-Disposition", "attachment; filename="+fileName)
	ctx.Header("Content-Transfer-Encoding", "binary")
	_, _ = ctx.Writer.Write(data)
}