package utils

import (
	"encoding/json"
	"fmt"
	"io"
	"io/ioutil"
	"net/http"

	"github.com/astaxie/beego"
	"github.com/zjxpcyc/request"
)

type WxResult struct {
	Code    int
	Message string
	Result  interface{}
}

var wechatInited = false

// WechatInit 微信初始化
func WechatInit() error {
	if wechatInited {
		return nil
	}

	wxconf, err := beego.AppConfig.GetSection("wechat")
	if err != nil {
		beego.Error("获取微信配置失败: ", err.Error())
		return err
	}

	config := request.NewConfig(wxconf["service"] + "wx/register")
	config.AddParam("appid", wxconf["appid"])
	config.AddParam("secret", wxconf["secret"])
	config.AddParam("token", wxconf["token"])
	config.AddParam("aeskey", wxconf["aeskey"])
	config.Method = http.MethodPost

	_, err = Request(config)
	if err == nil {
		wechatInited = true
	}

	return err
}

// GetUserInfo 获取个人信息
func GetUserInfo(code string) (interface{}, error) {
	wxconf, err := beego.AppConfig.GetSection("wechat")
	if err != nil {
		beego.Error("获取微信配置失败: ", err.Error())
		return nil, err
	}

	config := request.NewConfig(wxconf["service"] + "wx/userinfo")
	config.AddParam("appid", wxconf["appid"])
	config.AddParam("code", code)
	config.Method = http.MethodGet

	return Request(config)
}

// GetJSTicket 获取分享 ticket
func GetJSTicket(link string) (interface{}, error) {
	wxconf, err := beego.AppConfig.GetSection("wechat")
	if err != nil {
		beego.Error("获取微信配置失败: ", err.Error())
		return nil, err
	}

	config := request.NewConfig(wxconf["service"] + "wx/jssdk")
	config.AddParam("appid", wxconf["appid"])
	config.AddParam("url", link)
	config.Method = http.MethodGet

	return Request(config)
}

func Request(config *request.Config) (interface{}, error) {
	body, _, err := request.Do(config)
	if err != nil {
		beego.Error("请求微信服务失败: ", err.Error())
		return nil, err
	}

	res, err := getResult(body)
	if err != nil {
		return nil, err
	}

	if res.Code != http.StatusOK {
		return nil, fmt.Errorf("请求微信服务失败: %s", res.Message)
	}

	return res.Result.(interface{}), nil
}

func getResult(body io.ReadCloser) (*WxResult, error) {
	defer body.Close()

	bs, err := ioutil.ReadAll(body)
	if err != nil {
		beego.Error("读取微信服务结果失败: ", err.Error())
		return nil, err
	}

	res := WxResult{}
	if err := json.Unmarshal(bs, &res); err != nil {
		beego.Error("转换微信服务结果失败: ", err.Error())
		return nil, err
	}

	return &res, nil
}