package router

import (
	"encoding/json"
	"errors"
	"fmt"
	credential "github.com/bytedance/douyin-openapi-credential-go/client"
	openApiSdkClient "github.com/bytedance/douyin-openapi-sdk-go/client"
	"github.com/gin-gonic/gin"
	"go.uber.org/zap"
	"io"
	"net/http"
	"net/url"
	"strconv"
	"time"
	viperConfig "youtu_ecpm/config"
	"youtu_ecpm/log"
)

func InitGin(r *gin.Engine) *gin.Engine {
	r.GET("/get-ecpm", getEcpm)
	r.GET("/code2openId", code2openId)
	return r
}

// 定义抖音 API 响应的结构体
type APIResponse struct {
	BaseResp struct {
		StatusCode    int    `json:"StatusCode"`
		StatusMessage string `json:"StatusMessage"`
	} `json:"BaseResp"`
	Data struct {
		Records []Record `json:"records"`
		Total   int      `json:"total"`
	} `json:"data"`
	ErrMsg string `json:"err_msg"`
	ErrNo  int    `json:"err_no"`
	LogID  string `json:"log_id"`
}

type Record struct {
	Aid       string `json:"aid"`
	Cost      int    `json:"cost"`
	Did       string `json:"did"`
	EventName string `json:"event_name"`
	EventTime string `json:"event_time"`
	OpenID    string `json:"open_id"`
	ID        int    `json:"id"`
}

type EcpmReq struct {
	OpenId string `json:"open_id" form:"open_id"`
	MpId   string `json:"mp_id" form:"mp_id" binding:"required"`
}

func code2openId(c *gin.Context) {
	code := c.Query("code")
	anonymousOpenid := c.Query("anonymous_openid")
	openId, err := AppsJsCode2session(code, anonymousOpenid)
	if err != nil {
		c.JSON(200, gin.H{
			"code": 500,
			"msg":  http.StatusOK,
		})
		return
	}
	c.String(http.StatusOK, openId)
}

func getEcpm(c *gin.Context) {
	var req EcpmReq
	if err := c.ShouldBind(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	if req.OpenId == "" {
		c.JSON(http.StatusBadRequest, false)
		return
	}

	// 获取动态的 access_token
	accessToken, err := GetAccessToken()
	if err != nil {
		errorMessage := fmt.Sprintf("获取 access_token 失败: %v", err)
		fmt.Println(errorMessage)
		c.String(http.StatusInternalServerError, errorMessage)
		return
	}

	res, err := getEcpmFromApi(req, accessToken)

	// 计算 ECPM
	totalCost := 0
	totalRecords := len(res)

	for _, record := range res {
		totalCost += record.Cost
	}

	// 如果没有记录，则返回错误
	if totalRecords == 0 {
		errorMessage := "未找到记录，无法计算 ECPM"
		fmt.Println(errorMessage)
		c.JSON(http.StatusOK, false)
		return
	}
	// 总 cost / 100000 * 1000 / 总记录数
	ecpm := float64(totalCost) / 100000 * 1000 / float64(totalRecords)
	// 打印日志
	log.ZapLog.Info("ECPM:", zap.Float64("ecpm", ecpm))
	// 根据 ECPM 值判断并返回 "true" 或 "false"
	var result bool
	if ecpm > float64(viperConfig.GetEcpmValue()) && viperConfig.GetEcpmView() > 2 {
		result = true
	} else {
		result = false
	}

	// 返回结果
	c.JSON(http.StatusOK, result)
}

func getEcpmFromApi(req EcpmReq, accessToken string) (list []Record, err error) {
	// 构造抖音 API 请求的 URL
	apiURL := "https://minigame.zijieapi.com/mgplatform/api/apps/data/get_ecpm"
	params := url.Values{}
	params.Add("open_id", req.OpenId)
	params.Add("mp_id", req.MpId)

	fullURL := fmt.Sprintf("%s?open_id=%s&mp_id=%s&access_token=%s&date_hour=%s&page_size=500&page_no=", apiURL, req.OpenId, req.MpId, accessToken, time.Now().Format(time.DateOnly))
	pageNo := 1
	for {
		fullURL += strconv.Itoa(pageNo)
		var responseBody []byte
		func() {
			// 调用抖音 API
			var resp *http.Response
			resp, err = http.Get(fullURL)
			if err != nil {
				err = errors.New("调用抖音 API 失败")
				return
			}
			defer resp.Body.Close()
			// 读取抖音 API 响应数据
			responseBody, err = io.ReadAll(resp.Body)
			if err != nil {
				err = errors.New("读取抖音 API 响应失败")
				return
			}
		}()

		// 解析抖音 API 响应数据
		var apiResponse APIResponse
		err = json.Unmarshal(responseBody, &apiResponse)
		if err != nil {
			err = errors.New("解析 API 响应数据失败")
			return
		}

		// 检查 API 是否返回错误
		if apiResponse.ErrNo != 0 {
			errorMessage := fmt.Sprintf("抖音 API 返回错误: %s (错误码: %d)", apiResponse.ErrMsg, apiResponse.ErrNo)
			err = errors.New(errorMessage)
			return
		}

		list = append(list, apiResponse.Data.Records...)
		if len(apiResponse.Data.Records) <= 500 {
			return
		}

		pageNo++
	}

}

func AppsJsCode2session(code, anonymousOpenid string) (openId string, err error) {

	/* 构建请求参数，该代码示例中只给出部分参数，请用户根据需要自行构建参数值
	   	token:
	   	   1.若用户自行维护token,将用户维护的token赋值给该参数即可
	          2.SDK包中有获取token的函数，请根据接口path在《OpenAPI SDK 总览》文档中查找获取token函数的名字
	            在使用过程中，请注意token互刷问题
	       header:
	          sdk中默认填充content-type请求头，若不需要填充除content-type之外的请求头，删除该参数即可
	*/
	sdkRequest := &openApiSdkClient.AppsJscode2sessionRequest{}
	sdkRequest.SetAppid(viperConfig.GetAppId())
	if code == "" && anonymousOpenid == "" {
		err = errors.New("code can not be empty")
		return
	}
	if code == "" {
		sdkRequest.SetAnonymousCode(anonymousOpenid)
	} else {
		sdkRequest.SetCode(code)
	}
	sdkRequest.SetSecret(viperConfig.GetSecret())

	// sdk调用
	sdkResponse, err := sdkClient.AppsJscode2session(sdkRequest)
	if err != nil {
		return
	}

	if sdkResponse.Error != nil && *sdkResponse.Error != 0 {
		if sdkResponse.Errmsg != nil {
			err = errors.New(*sdkResponse.Errmsg)
		} else {
			err = errors.New("api 未知错误")
		}
		return
	}

	if sdkResponse.Openid == nil {
		err = errors.New("open id is nil")
		return
	}
	return *sdkResponse.Openid, nil
}

var sdkClient *openApiSdkClient.Client

func init() {
	// 初始化 SDK 客户端，设置 app_id 和 secret
	opt := new(credential.Config).
		SetClientKey(viperConfig.GetAppId()).    // 替换为你的 app_id
		SetClientSecret(viperConfig.GetSecret()) // 替换为你的 secret
	var err error
	// 创建 SDK 客户端
	sdkClient, err = openApiSdkClient.NewClient(opt)
	if err != nil {
		panic(err)
	}
}

// 获取 access_token 的函数
func GetAccessToken() (accecksToken string, err error) {

	// 构造获取 token 的请求参数
	sdkRequest := &openApiSdkClient.AppsV2TokenRequest{}
	sdkRequest.SetAppid(viperConfig.GetAppId())   // 设置应用 ID
	sdkRequest.SetGrantType("client_credential")  // 设置授权类型（client_credentials 模式）
	sdkRequest.SetSecret(viperConfig.GetSecret()) // 设置密钥

	// 调用 SDK 获取 access_token
	sdkResponse, err := sdkClient.AppsV2Token(sdkRequest)
	if err != nil {
		return "", fmt.Errorf("SDK 调用失败: %v", err)
	}

	// 返回 access_token
	return *sdkResponse.Data.AccessToken, nil
}