package douyin_openapi

import (
	"encoding/json"
	"errors"
	"fmt"
	accessToken "gitea.youtukeji.com.cn/xiabin/douyin-openapi/access-token"
	"gitea.youtukeji.com.cn/xiabin/douyin-openapi/cache"
	"gitea.youtukeji.com.cn/xiabin/douyin-openapi/util"
	"io"
	"net/http"
	"strconv"
)

const (
	code2Session = "/api/apps/v2/jscode2session"                                     // 小程序登录地址
	getEcpm      = "https://minigame.zijieapi.com/mgplatform/api/apps/data/get_ecpm" // 获取ECPM
)

// DouYinOpenApiConfig 实例化配置
type DouYinOpenApiConfig struct {
	AppId       string
	AppSecret   string
	AccessToken accessToken.AccessToken
	Cache       cache.Cache
	IsSandbox   bool
	Token       string
	Salt        string
}

// DouYinOpenApi 基类
type DouYinOpenApi struct {
	Config  DouYinOpenApiConfig
	BaseApi string
}

// NewDouYinOpenApi 实例化一个抖音openapi实例
func NewDouYinOpenApi(config DouYinOpenApiConfig) *DouYinOpenApi {
	if config.Cache == nil {
		config.Cache = cache.NewMemory()
	}
	if config.AccessToken == nil {
		config.AccessToken = accessToken.NewDefaultAccessToken(config.AppId, config.AppSecret, config.Cache, config.IsSandbox)
	}
	BaseApi := "https://developer.toutiao.com"
	if config.IsSandbox {
		BaseApi = "https://open-sandbox.douyin.com"
	}
	return &DouYinOpenApi{
		Config:  config,
		BaseApi: BaseApi,
	}
}

// GetApiUrl 获取api地址
func (d *DouYinOpenApi) GetApiUrl(url string) string {
	return fmt.Sprintf("%s%s", d.BaseApi, url)
}

// PostJson 封装公共的请求方法
func (d *DouYinOpenApi) PostJson(api string, params any, response any) (err error) {
	body, err := util.PostJSON(api, params)
	if err != nil {
		return
	}
	err = json.Unmarshal(body, &response)
	if err != nil {
		return
	}
	return
}

// Code2SessionParams 小程序登录 所需参数
type Code2SessionParams struct {
	Appid         string `json:"appid,omitempty"`
	Secret        string `json:"secret,omitempty"`
	AnonymousCode string `json:"anonymous_code,omitempty"`
	Code          string `json:"code,omitempty"`
}

// Code2SessionResponse 小程序登录返回值
type Code2SessionResponse struct {
	ErrNo   int                      `json:"err_no,omitempty"`
	ErrTips string                   `json:"err_tips,omitempty"`
	Data    Code2SessionResponseData `json:"data,omitempty"`
}

type Code2SessionResponseData struct {
	SessionKey      string `json:"session_key,omitempty"`
	Openid          string `json:"openid,omitempty"`
	AnonymousOpenid string `json:"anonymous_openid,omitempty"`
	UnionId         string `json:"unionid,omitempty"`
}

// Code2Session 小程序登录
func (d *DouYinOpenApi) Code2Session(code, anonymousCode string) (code2SessionResponse Code2SessionResponse, err error) {
	params := Code2SessionParams{
		Appid:         d.Config.AppId,
		Secret:        d.Config.AppSecret,
		AnonymousCode: anonymousCode,
		Code:          code,
	}
	err = d.PostJson(d.GetApiUrl(code2Session), params, &code2SessionResponse)
	if err != nil {
		return
	}
	if code2SessionResponse.ErrNo != 0 {
		return code2SessionResponse, fmt.Errorf("小程序登录错误: %s %d", code2SessionResponse.ErrTips, code2SessionResponse.ErrNo)
	}
	return
}

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"`
}

// GetEcpmParams 获取ECPM参数
type GetEcpmParams struct {
	AppId       string `json:"app_id" form:"app_id"`
	OpenId      string `json:"open_id" form:"open_id"`
	AccessToken string `json:"access_token" form:"access_token"`
	DateHour    string `json:"date_hour" form:"date_hour"`
	PageSize    int    `json:"page_size" form:"page_size"`
	PageNo      int    `json:"page_no" form:"page_no"`
}

// GetEcpmResponseData 获取ECPM响应数据
type GetEcpmResponseData 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"`
}

// GetEcpm 获取ECPM
// https://bytedance.larkoffice.com/docx/Vg4yd0RDSovZINxJDyIc6THhnod
// 根据分页大小循环获取，聚合总数返回
func (d *DouYinOpenApi) GetEcpm(params GetEcpmParams) (list []Record, err error) {
	fullURL := fmt.Sprintf("%s?open_id=%s&mp_id=%s&access_token=%s&date_hour=%s&page_size=500&page_no=", getEcpm, params.OpenId, params.AppId, params.AccessToken, params.DateHour)
	for {
		fullURL += strconv.Itoa(params.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 GetEcpmResponseData
		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 {
			err = fmt.Errorf("抖音 API 返回错误: %s (错误码: %d)", apiResponse.ErrMsg, apiResponse.ErrNo)
			return
		}

		list = append(list, apiResponse.Data.Records...)

		// 当页数据小于总页数时，无更多数据，返回
		if len(apiResponse.Data.Records) <= params.PageSize {
			return
		}

		params.PageNo++
	}
}