package user

import (
	"context"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"time"
	"tyc-server/app/main/model"
	jwtx "tyc-server/common/jwt"

	"github.com/pkg/errors"
	"github.com/zeromicro/go-zero/core/stores/sqlx"

	"tyc-server/app/main/api/internal/svc"
	"tyc-server/app/main/api/internal/types"

	"github.com/zeromicro/go-zero/core/logx"
)

type WxH5AuthLogic struct {
	logx.Logger
	ctx    context.Context
	svcCtx *svc.ServiceContext
}

func NewWxH5AuthLogic(ctx context.Context, svcCtx *svc.ServiceContext) *WxH5AuthLogic {
	return &WxH5AuthLogic{
		Logger: logx.WithContext(ctx),
		ctx:    ctx,
		svcCtx: svcCtx,
	}
}

func (l *WxH5AuthLogic) WxH5Auth(req *types.WXH5AuthReq) (resp *types.WXH5AuthResp, err error) {
	// Step 1: 使用code获取access_token
	accessTokenResp, err := GetAccessToken(req.Code)
	if err != nil {
		return nil, errors.Wrap(err, "获取access_token失败")
	}

	// Step 2: 查找用户授权信息
	userAuth, findErr := l.svcCtx.UserAuthModel.FindOneByAuthTypeAuthKey(l.ctx, accessTokenResp.Openid, "h5-weixin")
	if findErr != nil && !errors.Is(findErr, model.ErrNotFound) {
		return nil, errors.Wrapf(findErr, "查询用户授权失败，openid: %s", accessTokenResp.Openid)
	}

	// Step 3: 查找或创建用户
	var user *model.User
	if userAuth != nil {
		// 授权信息存在，查找用户
		userModel, findUserErr := l.svcCtx.UserModel.FindOne(l.ctx, userAuth.UserId)
		if findUserErr != nil {
			return nil, errors.Wrapf(findUserErr, "查询用户失败，userId: %d", userAuth.UserId)
		}
		user = userModel
	} else {
		// 授权信息不存在，创建新用户
		user = &model.User{}
		if transErr := l.svcCtx.UserModel.Trans(l.ctx, func(context context.Context, session sqlx.Session) error {
			// 插入数据库
			insertResult, insertErr := l.svcCtx.UserModel.Insert(l.ctx, session, user)
			if insertErr != nil {
				return errors.Wrapf(insertErr, "创建新用户失败，openid: %s", accessTokenResp.Openid)
			}
			// 获取插入后生成的 user.Id
			lastInsertId, lastInsertIdErr := insertResult.LastInsertId()
			if lastInsertIdErr != nil {
				return errors.Wrapf(lastInsertIdErr, "获取新用户ID失败，openid: %s", accessTokenResp.Openid)
			}
			user.Id = lastInsertId
			// 创建用户授权信息
			userAuth = &model.UserAuth{
				UserId:   user.Id,
				AuthKey:  accessTokenResp.Openid,
				AuthType: "mp-weixin", // 微信小程序
			}
			if _, insertUserAuthErr := l.svcCtx.UserAuthModel.Insert(l.ctx, session, userAuth); insertUserAuthErr != nil {
				return errors.Wrapf(insertUserAuthErr, "创建用户授权失败，openid: %s", accessTokenResp.Openid)
			}
			return nil
		}); transErr != nil {
			return nil, transErr
		}

	}

	// Step 4: 生成JWT Token
	token, genErr := jwtx.GenerateJwtToken(user.Id, l.svcCtx.Config.JwtAuth.AccessSecret, l.svcCtx.Config.JwtAuth.AccessExpire)
	if genErr != nil {
		return nil, errors.Wrap(genErr, "生成JWT token失败")
	}

	now := time.Now().Unix()
	return &types.WXH5AuthResp{
		AccessToken:  token,
		AccessExpire: now + l.svcCtx.Config.JwtAuth.AccessExpire,
		RefreshAfter: now + l.svcCtx.Config.JwtAuth.RefreshAfter,
	}, nil
}

type AccessTokenResp struct {
	AccessToken string `json:"access_token"`
	Openid      string `json:"openid"`
}

// GetAccessToken 通过code获取access_token
func GetAccessToken(code string) (*AccessTokenResp, error) {
	appID := "wxd1554b7a57cecc9e"
	appSecret := "fb8026c0bc66625b580453300d4b43db"

	url := fmt.Sprintf("https://api.weixin.qq.com/sns/oauth2/access_token?appid=%s&secret=%s&code=%s&grant_type=authorization_code", appID, appSecret, code)

	resp, err := http.Get(url)
	if err != nil {
		return nil, errors.Wrap(err, "获取access_token失败")
	}
	defer resp.Body.Close()

	body, err := io.ReadAll(resp.Body)
	if err != nil {
		return nil, errors.Wrap(err, "读取access_token响应失败")
	}

	var accessTokenResp AccessTokenResp
	if err := json.Unmarshal(body, &accessTokenResp); err != nil {
		return nil, errors.Wrap(err, "解析access_token响应失败")
	}

	if accessTokenResp.AccessToken == "" {
		return nil, errors.New("获取access_token失败")
	}

	return &accessTokenResp, nil
}