package wechat

import (
	"context"
	"io"
	"os"
	"server/utility/ecode"
	"sync"
	"time"

	"github.com/go-resty/resty/v2"
	"github.com/gogf/gf/v2/frame/g"
	"github.com/gogf/gf/v2/os/glog"
	"github.com/google/uuid"
)

type weChatClient struct {
	AppId        string
	AppSecret    string
	TicketExpire int
	Token        string
	accessToken  string
	expiresIn    int
	lastUpdated  time.Time
	mu           sync.RWMutex
}

var (
	instance *weChatClient
	once     sync.Once
)

func GetWeChatClient() *weChatClient {
	return instance
}
func init() {
	once.Do(func() {
		ctx := context.Background()
		instance = &weChatClient{
			AppId:        g.Config().MustGet(ctx, "wechat.appId").String(),
			AppSecret:    g.Config().MustGet(ctx, "wechat.appSecret").String(),
			TicketExpire: g.Config().MustGet(ctx, "wechat.ticketExpire").Int(),
			Token:        g.Config().MustGet(ctx, "wechat.token").String(),
		}

		go instance.autoRefreshToken(ctx)
	})
}

func (c *weChatClient) getAccessToken() error {
	result := struct {
		AccessToken string `json:"access_token"`
		ExpiresIn   int    `json:"expires_in"`
	}{}
	ctx := context.Background()
	resp, err := resty.New().R().
		SetQueryParams(g.MapStrStr{
			"grant_type": "client_credential",
			"appid":      c.AppId,
			"secret":     c.AppSecret,
		}).
		SetResult(&result).
		Get("https://api.weixin.qq.com/cgi-bin/token")

	if err != nil {
		glog.Errorf(ctx, "发起 get access_token 请求出现异常: %+v", err)
		return ecode.Fail.Sub("发起 get access_token 请求出现异常")
	}
	if resp.StatusCode() != 200 {
		glog.Errorf(ctx, "获取微信 access_token 响应异常: %+v", resp.Status())
		return ecode.Fail.Sub("获取微信 access_token 失败")
	}

	c.mu.Lock()
	defer c.mu.Unlock()

	c.accessToken = result.AccessToken
	c.expiresIn = result.ExpiresIn
	c.lastUpdated = time.Now()
	glog.Infof(ctx, "获取微信 access_token 成功: %+v", c.accessToken)
	return nil
}
func (c *weChatClient) autoRefreshToken(ctx context.Context) {
	for {
		// 初次获取
		if err := c.getAccessToken(); err != nil {
			time.Sleep(1 * time.Minute)
			continue
		}

		// 等待 expiresIn - 300 秒（即提前 5 分钟刷新）
		c.mu.RLock()
		expiresIn := c.expiresIn
		c.mu.RUnlock()

		refreshAfter := time.Duration(expiresIn-300) * time.Second
		time.Sleep(refreshAfter)
	}
}
func (c *weChatClient) GetTicket(sceneId string) (string, error) {
	body := map[string]interface{}{
		"expire_seconds": c.TicketExpire,
		"action_name":    "QR_STR_SCENE",
		"action_info": map[string]interface{}{
			"scene": map[string]string{
				"scene_str": sceneId,
			},
		},
	}
	result := struct {
		Ticket        string `json:"ticket"`
		ExpireSeconds int    `json:"expire_seconds"`
		Url           string `json:"url"`
	}{}

	resp, err := resty.New().R().
		SetQueryParams(g.MapStrStr{"access_token": c.accessToken}).
		SetBody(body).
		SetResult(&result).
		Post("https://api.weixin.qq.com/cgi-bin/qrcode/create")

	if err != nil {
		glog.Errorf(context.Background(), "发起 get ticket 请求出现异常: %+v", err)
		return "", ecode.Fail.Sub("发起 get ticket 请求出现异常")
	}
	if resp.StatusCode() != 200 {
		glog.Errorf(context.Background(), "获取微信 ticket 响应异常: %+v", resp.Status())
		return "", ecode.Fail.Sub("获取微信 ticket 失败")
	}

	glog.Infof(context.Background(), "获取微信 ticket 成功: %+v", result.Ticket)
	return result.Ticket, nil
}

func (c *weChatClient) GetQrCode(ticket string) (imagePath string, err error) {
	qrCodeUrl := "https://mp.weixin.qq.com/cgi-bin/showqrcode"
	resp, err := resty.New().R().
		SetDoNotParseResponse(true).
		SetQueryParams(g.MapStrStr{"ticket": ticket}).
		Get(qrCodeUrl)

	if err != nil {
		glog.Errorf(context.Background(), "获取二维码图片请求异常: %+v", err)
		return "", ecode.Fail.Sub("获取二维码图片请求失败")
	}
	if resp.StatusCode() != 200 {
		glog.Errorf(context.Background(), "获取二维码图片响应异常: %+v", resp.Status())
		return "", ecode.Fail.Sub("获取二维码图片失败")
	}
	imagePath = uuid.New().String() + ".jpg"

	data, readErr := io.ReadAll(resp.RawBody())
	if readErr != nil {
		glog.Errorf(context.Background(), "读取二维码图片失败: %+v", readErr)
		return "", ecode.Fail.Sub("读取二维码图片失败")
	}
	defer resp.RawBody().Close()

	writeErr := os.WriteFile(imagePath, data, 0644)
	if writeErr != nil {
		glog.Errorf(context.Background(), "保存二维码图片失败: %+v", writeErr)
		return "", ecode.Fail.Sub("保存二维码图片失败")
	}

	glog.Infof(context.Background(), "二维码图片保存成功: %s", imagePath)
	return imagePath, nil
}

func (c *weChatClient) GetToken() string {
	return c.Token
}

func (c *weChatClient) GetUserUnionId(ctx context.Context, openid string) (unionId string, err error) {

	// TODO 获取唯一UnionId
	//result := struct {
	//	UnionId string `json:"unionid"`
	//}{}
	//
	//resp, err := resty.New().R().
	//	SetQueryParams(g.MapStrStr{"access_token": c.accessToken}).SetQueryParam("openid", openid).
	//	SetResult(&result).
	//	Get("https://api.weixin.qq.com/cgi-bin/user/info")
	//
	//if err != nil {
	//	glog.Errorf(ctx, "发起 get ticket 请求出现异常: %+v", err)
	//	return "", ecode.Fail.Sub("发起 get ticket 请求出现异常")
	//}
	//if resp.StatusCode() != 200 {
	//	glog.Errorf(ctx, "获取微信 ticket 响应异常: %+v", resp.Status())
	//	return "", ecode.Fail.Sub("获取微信 ticket 失败")
	//}
	return openid, nil
}