package daytask

import (
	"app/apis/middleware"
	"app/commons/core/redisclient"
	"app/commons/model/entity"
	"crypto/md5"
	"crypto/rand"
	"encoding/hex"
	"encoding/json"
	"fmt"
	"io"
	"math/big"
	"net/http"
	"net/smtp"
	"net/url"
	"regexp"
	"strconv"
	"strings"
	"time"

	"github.com/gin-gonic/gin"
	"golang.org/x/crypto/bcrypt"
)

// generateInviteCode 生成邀请码
func generateInviteCode() string {
	const charset = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
	code := make([]byte, 8)
	for i := range code {
		n, _ := rand.Int(rand.Reader, big.NewInt(int64(len(charset))))
		code[i] = charset[n.Int64()]
	}
	return string(code)
}

// generateUid 生成用户UID（时间戳+随机数，防止并发碰撞）
func generateUid() string {
	n, _ := rand.Int(rand.Reader, big.NewInt(9999))
	return fmt.Sprintf("DT%d%04d", time.Now().UnixNano()/1000000, n.Int64())
}

// sendSmsBao 调用短信宝发送短信
func sendSmsBao(user, pass, sign, phone, code string) error {
	// 短信宝API接口
	// 国内: http://api.smsbao.com/sms
	// 国际: http://api.smsbao.com/wsms
	apiUrl := "http://api.smsbao.com/wsms" // 默认使用国际接口

	// 国内手机号使用国内接口
	if strings.HasPrefix(phone, "86") || (!strings.HasPrefix(phone, "+") && len(phone) == 11) {
		apiUrl = "http://api.smsbao.com/sms"
		// 国内手机号去掉区号前缀
		if strings.HasPrefix(phone, "86") {
			phone = phone[2:]
		}
	}

	// MD5加密密码
	h := md5.New()
	h.Write([]byte(pass))
	passHash := hex.EncodeToString(h.Sum(nil))

	// 短信内容
	content := fmt.Sprintf("【%s】您的验证码是%s，在5分钟内有效。", sign, code)

	// 构建请求参数
	params := url.Values{}
	params.Set("u", user)
	params.Set("p", passHash)
	params.Set("m", phone)
	params.Set("c", content)

	// 发送请求
	resp, err := http.Get(apiUrl + "?" + params.Encode())
	if err != nil {
		return fmt.Errorf("sms request failed: %v", err)
	}
	defer resp.Body.Close()

	body, _ := io.ReadAll(resp.Body)
	result := strings.TrimSpace(string(body))

	// 短信宝返回码: 0=成功, 其他=失败
	if result != "0" {
		return fmt.Errorf("smsbao error: %s", result)
	}

	return nil
}

// sendEmail 发送邮件验证码
func sendEmail(host string, port int, user, pass, fromName, toEmail, code string) error {
	from := user
	subject := "Verification Code"
	body := fmt.Sprintf(`
		<div style="padding:20px;font-family:Arial,sans-serif;">
			<h2 style="color:#ffc300;">Vitiens</h2>
			<p>Your verification code is:</p>
			<h1 style="color:#ffc300;font-size:36px;letter-spacing:8px;">%s</h1>
			<p>This code will expire in 5 minutes.</p>
			<p style="color:#999;font-size:12px;">If you did not request this code, please ignore this email.</p>
		</div>
	`, code)

	// 构建邮件内容（固定header顺序）
	msg := fmt.Sprintf("From: %s <%s>\r\n", fromName, from)
	msg += fmt.Sprintf("To: %s\r\n", toEmail)
	msg += fmt.Sprintf("Subject: %s\r\n", subject)
	msg += "MIME-Version: 1.0\r\n"
	msg += "Content-Type: text/html; charset=UTF-8\r\n"
	msg += "\r\n" + body

	addr := fmt.Sprintf("%s:%d", host, port)
	auth := smtp.PlainAuth("", user, pass, host)

	return smtp.SendMail(addr, auth, from, []string{toEmail}, []byte(msg))
}

// SendSmsCode 发送短信/邮件验证码
func (s *Server) SendSmsCode(c *gin.Context) {
	ctx := s.FromContext(c)
	db := s.DB()

	type Req struct {
		Type     string `json:"type" binding:"required"`    // phone/email
		Account  string `json:"account" binding:"required"` // 手机号或邮箱
		AreaCode string `json:"areaCode"`                   // 国际区号 如 84, 86
		Scene    string `json:"scene" binding:"required"`   // register/login/reset/bind
	}
	var req Req
	if err := c.ShouldBindJSON(&req); err != nil {
		ctx.Fail("invalid_params")
		return
	}

	// 验证类型
	if req.Type != "phone" && req.Type != "email" {
		ctx.Fail("unsupported_type")
		return
	}

	var accountKey string // 用于缓存的key

	if req.Type == "phone" {
		// 验证手机号格式
		phoneRegex := regexp.MustCompile(`^\d{9,15}$`)
		if !phoneRegex.MatchString(req.Account) {
			ctx.Fail("invalid_phone")
			return
		}
		accountKey = req.Account
		if req.AreaCode != "" {
			accountKey = req.AreaCode + req.Account
		}
	} else {
		// 验证邮箱格式
		emailRegex := regexp.MustCompile(`^[a-zA-Z0-9._%+\-]+@[a-zA-Z0-9.\-]+\.[a-zA-Z]{2,}$`)
		if !emailRegex.MatchString(req.Account) {
			ctx.Fail("invalid_email")
			return
		}
		accountKey = req.Account
	}

	// 防止重复发送
	cacheKey := fmt.Sprintf("code:%s:%s", req.Scene, accountKey)
	if !ctx.RepeatFilter(cacheKey, 60*time.Second) {
		ctx.Fail("code_send_too_fast")
		return
	}

	// 生成验证码
	n, _ := rand.Int(rand.Reader, big.NewInt(900000))
	code := fmt.Sprintf("%06d", n.Int64()+100000)

	if req.Type == "phone" {
		// 发送短信验证码
		var smsUser, smsPass, smsSign string
		var config entity.DtConfig
		if err := db.Where("`key` = ?", entity.ConfigKeySmsUser).First(&config).Error; err == nil {
			smsUser = config.Value
		}
		if err := db.Where("`key` = ?", entity.ConfigKeySmsPass).First(&config).Error; err == nil {
			smsPass = config.Value
		}
		if err := db.Where("`key` = ?", entity.ConfigKeySmsSign).First(&config).Error; err == nil {
			smsSign = config.Value
		}
		if smsUser != "" && smsPass != "" {
			if err := sendSmsBao(smsUser, smsPass, smsSign, accountKey, code); err != nil {
				ctx.Fail("sms_send_failed")
				return
			}
		} else {
			fmt.Printf("[DEV] SMS Code for %s: %s\n", accountKey, code)
		}
	} else {
		// 发送邮件验证码
		var smtpHost, smtpPortStr, smtpUser, smtpPass, smtpFrom string
		// 批量查询所有smtp配置，避免复用同一struct导致GORM主键污染
		var smtpConfigs []entity.DtConfig
		db.Where("`group` = ?", "smtp").Find(&smtpConfigs)
		for _, cfg := range smtpConfigs {
			switch cfg.Key {
			case entity.ConfigKeySmtpHost:
				smtpHost = cfg.Value
			case entity.ConfigKeySmtpPort:
				smtpPortStr = cfg.Value
			case entity.ConfigKeySmtpUser:
				smtpUser = cfg.Value
			case entity.ConfigKeySmtpPass:
				smtpPass = cfg.Value
			case entity.ConfigKeySmtpFrom:
				smtpFrom = cfg.Value
			}
		}
		if smtpFrom == "" {
			smtpFrom = "Vitiens"
		}

		if smtpHost != "" && smtpUser != "" && smtpPass != "" {
			smtpPort, _ := strconv.Atoi(smtpPortStr)
			if smtpPort == 0 {
				smtpPort = 587
			}
			if err := sendEmail(smtpHost, smtpPort, smtpUser, smtpPass, smtpFrom, req.Account, code); err != nil {
				fmt.Printf("[ERROR] Send email failed: %v\n", err)
				ctx.Fail("email_send_failed")
				return
			}
		} else {
			fmt.Printf("[DEV] Email Code for %s: %s\n", req.Account, code)
		}
	}

	// 存储验证码到Redis
	codeKey2 := fmt.Sprintf("verifycode:%s:%s", req.Scene, accountKey)
	redisclient.DefaultClient().Set(c, codeKey2, code, 5*time.Minute)

	ctx.OK(gin.H{
		"message": "code_sent",
	})
}

// Register 用户注册
func (s *Server) Register(c *gin.Context) {
	ctx := s.FromContext(c)
	db := s.DB()

	type Req struct {
		Type       string `json:"type" binding:"required"`    // phone/email
		Account    string `json:"account" binding:"required"` // 手机号或邮箱
		Code       string `json:"code" binding:"required"`
		Password   string `json:"password" binding:"required,min=6"`
		InviteCode string `json:"inviteCode"`
		AreaCode   string `json:"areaCode"` // 国际区号
	}
	var req Req
	if err := c.ShouldBindJSON(&req); err != nil {
		ctx.Fail("invalid_params")
		return
	}

	// 验证类型
	if req.Type != "phone" && req.Type != "email" {
		ctx.Fail("unsupported_type")
		return
	}

	// 账号Key
	accountKey := req.Account
	if req.Type == "phone" && req.AreaCode != "" {
		accountKey = req.AreaCode + req.Account
	}

	// 检查验证码尝试次数（防暴力破解，5次锁定15分钟）
	failKey := fmt.Sprintf("code_fail:register:%s", accountKey)
	failCount, _ := redisclient.DefaultClient().Get(c, failKey).Int()
	if failCount >= 5 {
		ctx.Fail("too_many_attempts")
		return
	}

	// 验证验证码
	codeKey := fmt.Sprintf("verifycode:register:%s", accountKey)
	storedCode, err := redisclient.DefaultClient().Get(c, codeKey).Result()
	if err != nil || storedCode != req.Code {
		redisclient.DefaultClient().Incr(c, failKey)
		redisclient.DefaultClient().Expire(c, failKey, 15*time.Minute)
		ctx.Fail("invalid_code")
		return
	}
	redisclient.DefaultClient().Del(c, failKey)

	// 检查是否已注册
	var existUser entity.DtUser
	if req.Type == "phone" {
		if err := db.Where("phone = ?", accountKey).First(&existUser).Error; err == nil {
			ctx.Fail("phone_registered")
			return
		}
	} else {
		if err := db.Where("email = ?", accountKey).First(&existUser).Error; err == nil {
			ctx.Fail("email_registered")
			return
		}
	}

	// 查找邀请人
	var parentId int64 = 0
	if req.InviteCode != "" {
		var inviter entity.DtUser
		if err := db.Where("invite_code = ?", req.InviteCode).First(&inviter).Error; err == nil {
			parentId = inviter.Id
		}
	}

	// 加密密码
	hashedPassword, err := bcrypt.GenerateFromPassword([]byte(req.Password), bcrypt.DefaultCost)
	if err != nil {
		ctx.Fail("register_failed")
		return
	}

	// 获取默认等级
	var defaultLevel entity.DtUserLevel
	db.Where("is_default = ?", 1).First(&defaultLevel)

	// 昵称
	userPrefix := ctx.I18n("user_prefix")
	if userPrefix == "" || userPrefix == "user_prefix" {
		userPrefix = "User"
	}
	// 邮箱取@前部分，手机号取后4位
	accountSuffix := req.Account
	if req.Type == "email" {
		if atIdx := strings.Index(req.Account, "@"); atIdx > 0 {
			accountSuffix = req.Account[:atIdx]
		}
	} else if len(req.Account) >= 4 {
		accountSuffix = req.Account[len(req.Account)-4:]
	}
	nickname := userPrefix + accountSuffix

	// 创建用户
	user := &entity.DtUser{
		Uid:        generateUid(),
		Password:   string(hashedPassword),
		Nickname:   nickname,
		ParentId:   parentId,
		LevelId:    defaultLevel.Id,
		InviteCode: generateInviteCode(),
		Status:     1,
	}
	if req.Type == "phone" {
		user.Phone = accountKey
	} else {
		user.Email = accountKey
		// 邮箱注册时生成唯一占位手机号，避免uk_phone唯一索引冲突
		h := md5.New()
		h.Write([]byte(req.Account))
		emailHash := hex.EncodeToString(h.Sum(nil))[:16]
		user.Phone = fmt.Sprintf("email_%s", emailHash)
	}

	tx := db.Begin()

	if err := tx.Create(user).Error; err != nil {
		tx.Rollback()
		ctx.Fail("register_failed")
		return
	}

	// 更新邀请人的直推人数和团队人数
	if parentId > 0 {
		tx.Model(&entity.DtUser{}).Where("id = ?", parentId).
			Updates(map[string]interface{}{
				"direct_invite_count": tx.Raw("direct_invite_count + 1"),
				"team_count":          tx.Raw("team_count + 1"),
			})

		// 更新上级的团队人数（多级）
		var parent entity.DtUser
		if err := tx.Where("id = ?", parentId).First(&parent).Error; err == nil && parent.ParentId > 0 {
			tx.Model(&entity.DtUser{}).Where("id = ?", parent.ParentId).
				Update("team_count", tx.Raw("team_count + 1"))
		}
	}

	tx.Commit()

	// 删除验证码
	redisclient.DefaultClient().Del(c, codeKey)

	// 生成Token
	token, err := middleware.GenerateJWT(middleware.Member{ID: user.Id, Uid: user.Uid})
	if err != nil {
		ctx.Fail("register_failed")
		return
	}

	ctx.OK(gin.H{
		"token": token,
		"user": gin.H{
			"id":       user.Id,
			"uid":      user.Uid,
			"nickname": user.Nickname,
			"avatar":   user.Avatar,
			"phone":    user.Phone,
			"email":    user.Email,
		},
	})
}

// LoginByPassword 密码登录
func (s *Server) LoginByPassword(c *gin.Context) {
	ctx := s.FromContext(c)
	db := s.DB()

	type Req struct {
		Type     string `json:"type" binding:"required"`    // phone/email
		Account  string `json:"account" binding:"required"` // 手机号或邮箱
		Password string `json:"password" binding:"required"`
		AreaCode string `json:"areaCode"` // 国际区号
	}
	var req Req
	if err := c.ShouldBindJSON(&req); err != nil {
		ctx.Fail("invalid_params")
		return
	}

	// 检查登录尝试次数（防暴力破解，5次锁定15分钟）
	loginFailKey := fmt.Sprintf("login_fail:%s", req.Account)
	loginFailCount, _ := redisclient.DefaultClient().Get(c, loginFailKey).Int()
	if loginFailCount >= 5 {
		ctx.Fail("too_many_attempts")
		return
	}

	// 查找用户
	var user entity.DtUser
	if req.Type == "email" {
		if err := db.Where("email = ?", req.Account).First(&user).Error; err != nil {
			ctx.Fail("user_not_found")
			return
		}
	} else {
		fullPhone := req.Account
		if req.AreaCode != "" {
			fullPhone = req.AreaCode + req.Account
		}
		if err := db.Where("phone = ?", fullPhone).First(&user).Error; err != nil {
			ctx.Fail("user_not_found")
			return
		}
	}

	// 检查用户状态
	if user.Status != 1 {
		ctx.Fail("user_disabled")
		return
	}

	// 验证密码
	if err := bcrypt.CompareHashAndPassword([]byte(user.Password), []byte(req.Password)); err != nil {
		redisclient.DefaultClient().Incr(c, loginFailKey)
		redisclient.DefaultClient().Expire(c, loginFailKey, 15*time.Minute)
		ctx.Fail("invalid_password")
		return
	}
	redisclient.DefaultClient().Del(c, loginFailKey)

	// 更新登录时间
	db.Model(&entity.DtUser{}).Where("id = ?", user.Id).
		Update("last_login_time", time.Now().Unix())

	// 生成Token
	token, err := middleware.GenerateJWT(middleware.Member{ID: user.Id, Uid: user.Uid})
	if err != nil {
		ctx.Fail("login_failed")
		return
	}

	ctx.OK(gin.H{
		"token": token,
		"user": gin.H{
			"id":       user.Id,
			"uid":      user.Uid,
			"nickname": user.Nickname,
			"avatar":   user.Avatar,
			"phone":    user.Phone,
			"email":    user.Email,
		},
	})
}

// LoginBySms 短信验证码登录
func (s *Server) LoginBySms(c *gin.Context) {
	ctx := s.FromContext(c)
	db := s.DB()

	type Req struct {
		Phone    string `json:"phone" binding:"required"`
		Code     string `json:"code" binding:"required"`
		AreaCode string `json:"areaCode"` // 国际区号
	}
	var req Req
	if err := c.ShouldBindJSON(&req); err != nil {
		ctx.Fail("invalid_params")
		return
	}

	// 完整手机号（带区号）
	fullPhone := req.Phone
	if req.AreaCode != "" {
		fullPhone = req.AreaCode + req.Phone
	}

	// 检查验证码尝试次数（防暴力破解，5次锁定15分钟）
	failKey := fmt.Sprintf("code_fail:login:%s", fullPhone)
	failCount, _ := redisclient.DefaultClient().Get(c, failKey).Int()
	if failCount >= 5 {
		ctx.Fail("too_many_attempts")
		return
	}

	// 验证短信验证码
	codeKey := fmt.Sprintf("verifycode:login:%s", fullPhone)
	storedCode, err := redisclient.DefaultClient().Get(c, codeKey).Result()
	if err != nil || storedCode != req.Code {
		redisclient.DefaultClient().Incr(c, failKey)
		redisclient.DefaultClient().Expire(c, failKey, 15*time.Minute)
		ctx.Fail("invalid_code")
		return
	}
	redisclient.DefaultClient().Del(c, failKey)

	// 查找用户
	var user entity.DtUser
	if err := db.Where("phone = ?", fullPhone).First(&user).Error; err != nil {
		ctx.Fail("user_not_found")
		return
	}

	// 检查用户状态
	if user.Status != 1 {
		ctx.Fail("user_disabled")
		return
	}

	// 更新登录时间
	db.Model(&entity.DtUser{}).Where("id = ?", user.Id).
		Update("last_login_time", time.Now().Unix())

	// 删除验证码
	redisclient.DefaultClient().Del(c, codeKey)

	// 生成Token
	token, err2 := middleware.GenerateJWT(middleware.Member{ID: user.Id, Uid: user.Uid})
	if err2 != nil {
		ctx.Fail("login_failed")
		return
	}

	ctx.OK(gin.H{
		"token": token,
		"user": gin.H{
			"id":       user.Id,
			"uid":      user.Uid,
			"nickname": user.Nickname,
			"avatar":   user.Avatar,
			"phone":    user.Phone,
			"email":    user.Email,
		},
	})
}

// ResetPassword 重置密码
func (s *Server) ResetPassword(c *gin.Context) {
	ctx := s.FromContext(c)
	db := s.DB()

	type Req struct {
		Type        string `json:"type" binding:"required"`    // phone/email
		Account     string `json:"account" binding:"required"` // 手机号或邮箱
		Code        string `json:"code" binding:"required"`
		NewPassword string `json:"newPassword" binding:"required,min=6"`
		AreaCode    string `json:"areaCode"` // 国际区号
	}
	var req Req
	if err := c.ShouldBindJSON(&req); err != nil {
		ctx.Fail("invalid_params")
		return
	}

	// 账号Key
	accountKey := req.Account
	if req.Type == "phone" && req.AreaCode != "" {
		accountKey = req.AreaCode + req.Account
	}

	// 检查验证码尝试次数（防暴力破解，5次锁定15分钟）
	failKey := fmt.Sprintf("code_fail:reset:%s", accountKey)
	failCount, _ := redisclient.DefaultClient().Get(c, failKey).Int()
	if failCount >= 5 {
		ctx.Fail("too_many_attempts")
		return
	}

	// 验证验证码
	codeKey := fmt.Sprintf("verifycode:reset:%s", accountKey)
	storedCode, err := redisclient.DefaultClient().Get(c, codeKey).Result()
	if err != nil || storedCode != req.Code {
		redisclient.DefaultClient().Incr(c, failKey)
		redisclient.DefaultClient().Expire(c, failKey, 15*time.Minute)
		ctx.Fail("invalid_code")
		return
	}
	redisclient.DefaultClient().Del(c, failKey)

	// 查找用户
	var user entity.DtUser
	if req.Type == "email" {
		if err := db.Where("email = ?", accountKey).First(&user).Error; err != nil {
			ctx.Fail("user_not_found")
			return
		}
	} else {
		if err := db.Where("phone = ?", accountKey).First(&user).Error; err != nil {
			ctx.Fail("user_not_found")
			return
		}
	}

	// 加密新密码
	hashedPassword, err := bcrypt.GenerateFromPassword([]byte(req.NewPassword), bcrypt.DefaultCost)
	if err != nil {
		ctx.Fail("reset_failed")
		return
	}

	// 更新密码
	db.Model(&entity.DtUser{}).Where("id = ?", user.Id).
		Update("password", string(hashedPassword))

	// 删除验证码
	redisclient.DefaultClient().Del(c, codeKey)

	ctx.OK(gin.H{
		"message": "password_reset_success",
	})
}

// OAuthLogin OAuth登录（Google/Zalo等）
func (s *Server) OAuthLogin(c *gin.Context) {
	ctx := s.FromContext(c)
	db := s.DB()

	type Req struct {
		Provider   string `json:"provider" binding:"required"` // google/zalo/telegram
		OpenId     string `json:"openId" binding:"required"`
		Nickname   string `json:"nickname"`
		Avatar     string `json:"avatar"`
		InviteCode string `json:"inviteCode"`
		Extra      string `json:"extra"` // Zalo: code_verifier
	}
	var req Req
	if err := c.ShouldBindJSON(&req); err != nil {
		ctx.Fail("invalid_params")
		return
	}

	// TikTok 特殊处理：需要用 code 换取 access_token 和用户信息
	if req.Provider == "tiktok" && req.Extra != "" {
		tiktokUser, err := s.getTiktokUserInfo(req.OpenId, req.Extra)
		if err != nil {
			fmt.Printf("TikTok get user info error: %v\n", err)
			ctx.Fail("tiktok_auth_failed")
			return
		}
		req.OpenId = tiktokUser.ID
		req.Nickname = tiktokUser.Name
		req.Avatar = tiktokUser.Picture
	}

	// Zalo 特殊处理：需要用 code 换取 access_token
	if req.Provider == "zalo" && req.Extra != "" {
		zaloUser, err := s.getZaloUserInfo(req.OpenId, req.Extra)
		if err != nil {
			fmt.Printf("Zalo get user info error: %v\n", err)
			ctx.Fail("zalo_auth_failed")
			return
		}
		req.OpenId = zaloUser.ID
		req.Nickname = zaloUser.Name
		req.Avatar = zaloUser.Picture
	}

	// 查找是否已绑定
	var social entity.DtUserSocial
	if err := db.Where("platform = ? AND account = ?", req.Provider, req.OpenId).First(&social).Error; err == nil {
		// 已绑定，直接登录
		var user entity.DtUser
		if err := db.Where("id = ?", social.UserId).First(&user).Error; err != nil {
			ctx.Fail("user_not_found")
			return
		}

		if user.Status != 1 {
			ctx.Fail("user_disabled")
			return
		}

		// 更新登录时间
		db.Model(&entity.DtUser{}).Where("id = ?", user.Id).
			Update("last_login_time", time.Now().Unix())

		token, err := middleware.GenerateJWT(middleware.Member{ID: user.Id, Uid: user.Uid})
		if err != nil {
			ctx.Fail("login_failed")
			return
		}

		ctx.OK(gin.H{
			"token": token,
			"user": gin.H{
				"id":       user.Id,
				"uid":      user.Uid,
				"nickname": user.Nickname,
				"avatar":   user.Avatar,
				"phone":    user.Phone,
			},
		})
		return
	}

	// 未绑定，创建新用户
	var parentId int64 = 0
	if req.InviteCode != "" {
		var inviter entity.DtUser
		if err := db.Where("invite_code = ?", req.InviteCode).First(&inviter).Error; err == nil {
			parentId = inviter.Id
		}
	}

	// 获取默认等级
	var defaultLevel entity.DtUserLevel
	db.Where("is_default = ?", 1).First(&defaultLevel)

	nickname := req.Nickname
	if nickname == "" {
		oauthPrefix := ctx.I18n("user_prefix")
		if oauthPrefix == "" || oauthPrefix == "user_prefix" {
			oauthPrefix = "User"
		}
		nickname = req.Provider + oauthPrefix
	}

	// 为OAuth用户生成唯一占位手机号（用MD5避免截断碰撞）
	h := md5.New()
	h.Write([]byte(req.OpenId))
	openIdHash := hex.EncodeToString(h.Sum(nil))[:16]
	oauthPhone := fmt.Sprintf("oauth_%s_%s", req.Provider, openIdHash)

	user := &entity.DtUser{
		Uid:        generateUid(),
		Phone:      oauthPhone,
		Nickname:   nickname,
		Avatar:     req.Avatar,
		ParentId:   parentId,
		LevelId:    defaultLevel.Id,
		InviteCode: generateInviteCode(),
		Status:     1,
	}

	tx := db.Begin()

	if err := tx.Create(user).Error; err != nil {
		tx.Rollback()
		fmt.Printf("OAuth create user error: %v\n", err)

		// 如果是 phone 重复，说明用户已存在但缺少社交绑定，自动补绑定并登录
		var existingUser entity.DtUser
		if dbErr := db.Where("phone = ?", oauthPhone).First(&existingUser).Error; dbErr == nil {
			// 补创建社交绑定
			newSocial := entity.DtUserSocial{
				UserId:   existingUser.Id,
				Platform: req.Provider,
				Account:  req.OpenId,
				Nickname: req.Nickname,
				Avatar:   req.Avatar,
				Extra:    "{}",
			}
			db.Create(&newSocial)

			// 更新登录时间
			db.Model(&entity.DtUser{}).Where("id = ?", existingUser.Id).
				Update("last_login_time", time.Now().Unix())

			existToken, tokenErr := middleware.GenerateJWT(middleware.Member{ID: existingUser.Id, Uid: existingUser.Uid})
			if tokenErr != nil {
				ctx.Fail("login_failed")
				return
			}
			ctx.OK(gin.H{
				"token": existToken,
				"user": gin.H{
					"id":       existingUser.Id,
					"uid":      existingUser.Uid,
					"nickname": existingUser.Nickname,
					"avatar":   existingUser.Avatar,
					"phone":    existingUser.Phone,
					"email":    existingUser.Email,
				},
			})
			return
		}

		ctx.Fail("login_failed")
		return
	}

	// 创建社交账号绑定
	social = entity.DtUserSocial{
		UserId:   user.Id,
		Platform: req.Provider,
		Account:  req.OpenId,
		Nickname: req.Nickname,
		Avatar:   req.Avatar,
		Extra:    "{}",
	}
	if err := tx.Create(&social).Error; err != nil {
		tx.Rollback()
		fmt.Printf("OAuth create social error: %v\n", err)
		ctx.Fail("login_failed")
		return
	}

	// 更新邀请人统计
	if parentId > 0 {
		tx.Model(&entity.DtUser{}).Where("id = ?", parentId).
			Updates(map[string]interface{}{
				"direct_invite_count": tx.Raw("direct_invite_count + 1"),
				"team_count":          tx.Raw("team_count + 1"),
			})
	}

	tx.Commit()

	token, err := middleware.GenerateJWT(middleware.Member{ID: user.Id, Uid: user.Uid})
	if err != nil {
		fmt.Printf("OAuth generate JWT error: %v\n", err)
		ctx.Fail("login_failed")
		return
	}

	ctx.OK(gin.H{
		"token": token,
		"user": gin.H{
			"id":       user.Id,
			"uid":      user.Uid,
			"nickname": user.Nickname,
			"avatar":   user.Avatar,
			"phone":    user.Phone,
			"email":    user.Email,
		},
		"isNew": true,
	})
}

// ZaloUser Zalo用户信息
type ZaloUser struct {
	ID      string `json:"id"`
	Name    string `json:"name"`
	Picture string `json:"picture"`
}

// getZaloUserInfo 使用code获取Zalo用户信息
func (s *Server) getZaloUserInfo(code, codeVerifier string) (*ZaloUser, error) {
	db := s.DB()

	// 获取 Zalo App ID 和 Secret
	var appIdConfig, secretConfig entity.DtConfig
	if err := db.Where("`key` = ?", entity.ConfigKeyZaloAppId).First(&appIdConfig).Error; err != nil {
		return nil, fmt.Errorf("zalo app_id not configured")
	}
	if err := db.Where("`key` = ?", entity.ConfigKeyZaloSecret).First(&secretConfig).Error; err != nil {
		return nil, fmt.Errorf("zalo secret not configured")
	}

	// 1. 用 code 换取 access_token
	tokenUrl := "https://oauth.zaloapp.com/v4/access_token"
	data := url.Values{}
	data.Set("app_id", appIdConfig.Value)
	data.Set("code", code)
	data.Set("code_verifier", codeVerifier)
	data.Set("grant_type", "authorization_code")

	req, _ := http.NewRequest("POST", tokenUrl, strings.NewReader(data.Encode()))
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
	req.Header.Set("secret_key", secretConfig.Value)

	client := &http.Client{Timeout: 10 * time.Second}
	resp, err := client.Do(req)
	if err != nil {
		return nil, fmt.Errorf("request token failed: %v", err)
	}
	defer resp.Body.Close()

	body, _ := io.ReadAll(resp.Body)
	fmt.Printf("Zalo token response: %s\n", string(body))

	var tokenResp struct {
		AccessToken string `json:"access_token"`
		ExpiresIn   string `json:"expires_in"` // Zalo 返回的是字符串类型
		Error       int    `json:"error"`
		Message     string `json:"message"`
	}
	if err := json.Unmarshal(body, &tokenResp); err != nil {
		return nil, fmt.Errorf("parse token response failed: %v", err)
	}
	if tokenResp.Error != 0 || tokenResp.AccessToken == "" {
		return nil, fmt.Errorf("get token failed: %s", tokenResp.Message)
	}

	// 2. 用 access_token 获取用户信息
	userUrl := "https://graph.zalo.me/v2.0/me?fields=id,name,picture"
	userReq, _ := http.NewRequest("GET", userUrl, nil)
	userReq.Header.Set("access_token", tokenResp.AccessToken)

	userResp, err := client.Do(userReq)
	if err != nil {
		return nil, fmt.Errorf("request user info failed: %v", err)
	}
	defer userResp.Body.Close()

	userBody, _ := io.ReadAll(userResp.Body)
	fmt.Printf("Zalo user response: %s\n", string(userBody))

	// Zalo API 错误响应格式: {"error": -501, "message": "..."}
	// Zalo API 成功响应格式: {"id": "...", "name": "...", "picture": {...}}
	var errorResp struct {
		Error   int    `json:"error"`
		Message string `json:"message"`
	}
	if err := json.Unmarshal(userBody, &errorResp); err == nil && errorResp.Error != 0 {
		return nil, fmt.Errorf("get user info failed: [%d] %s", errorResp.Error, errorResp.Message)
	}

	var userInfo struct {
		ID      string `json:"id"`
		Name    string `json:"name"`
		Picture struct {
			Data struct {
				URL string `json:"url"`
			} `json:"data"`
		} `json:"picture"`
	}
	if err := json.Unmarshal(userBody, &userInfo); err != nil {
		return nil, fmt.Errorf("parse user info failed: %v", err)
	}
	if userInfo.ID == "" {
		return nil, fmt.Errorf("get user info failed: empty user id")
	}

	return &ZaloUser{
		ID:      userInfo.ID,
		Name:    userInfo.Name,
		Picture: userInfo.Picture.Data.URL,
	}, nil
}

// TiktokUser TikTok用户信息
type TiktokUser struct {
	ID      string `json:"id"`
	Name    string `json:"name"`
	Picture string `json:"picture"`
}

// getTiktokUserInfo 使用code获取TikTok用户信息
func (s *Server) getTiktokUserInfo(code, redirectUri string) (*TiktokUser, error) {
	db := s.DB()

	// 获取 TikTok Client Key 和 Secret
	var clientKeyConfig, clientSecretConfig entity.DtConfig
	if err := db.Where("`key` = ?", entity.ConfigKeyTiktokClientKey).First(&clientKeyConfig).Error; err != nil {
		return nil, fmt.Errorf("tiktok client_key not configured")
	}
	if err := db.Where("`key` = ?", entity.ConfigKeyTiktokClientSecret).First(&clientSecretConfig).Error; err != nil {
		return nil, fmt.Errorf("tiktok client_secret not configured")
	}

	// 1. 用 code 换取 access_token
	tokenUrl := "https://open.tiktokapis.com/v2/oauth/token/"
	data := url.Values{}
	data.Set("client_key", clientKeyConfig.Value)
	data.Set("client_secret", clientSecretConfig.Value)
	data.Set("code", code)
	data.Set("grant_type", "authorization_code")
	data.Set("redirect_uri", redirectUri)

	req, _ := http.NewRequest("POST", tokenUrl, strings.NewReader(data.Encode()))
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")

	client := &http.Client{Timeout: 10 * time.Second}
	resp, err := client.Do(req)
	if err != nil {
		return nil, fmt.Errorf("request token failed: %v", err)
	}
	defer resp.Body.Close()

	body, _ := io.ReadAll(resp.Body)
	fmt.Printf("TikTok token response: %s\n", string(body))

	var tokenResp struct {
		AccessToken string `json:"access_token"`
		OpenId      string `json:"open_id"`
		ExpiresIn   int    `json:"expires_in"`
		TokenType   string `json:"token_type"`
		Error       string `json:"error"`
		ErrorDesc   string `json:"error_description"`
	}
	if err := json.Unmarshal(body, &tokenResp); err != nil {
		return nil, fmt.Errorf("parse token response failed: %v", err)
	}
	if tokenResp.Error != "" || tokenResp.AccessToken == "" {
		return nil, fmt.Errorf("get token failed: %s - %s", tokenResp.Error, tokenResp.ErrorDesc)
	}

	// 2. 用 access_token 获取用户信息
	userUrl := "https://open.tiktokapis.com/v2/user/info/?fields=open_id,display_name,avatar_url"
	userReq, _ := http.NewRequest("GET", userUrl, nil)
	userReq.Header.Set("Authorization", "Bearer "+tokenResp.AccessToken)

	userResp, err := client.Do(userReq)
	if err != nil {
		return nil, fmt.Errorf("request user info failed: %v", err)
	}
	defer userResp.Body.Close()

	userBody, _ := io.ReadAll(userResp.Body)
	fmt.Printf("TikTok user response: %s\n", string(userBody))

	var userInfoResp struct {
		Data struct {
			User struct {
				OpenId      string `json:"open_id"`
				DisplayName string `json:"display_name"`
				AvatarUrl   string `json:"avatar_url"`
			} `json:"user"`
		} `json:"data"`
		Error struct {
			Code    string `json:"code"`
			Message string `json:"message"`
		} `json:"error"`
	}
	if err := json.Unmarshal(userBody, &userInfoResp); err != nil {
		return nil, fmt.Errorf("parse user info failed: %v", err)
	}
	if userInfoResp.Error.Code != "" && userInfoResp.Error.Code != "ok" {
		return nil, fmt.Errorf("get user info failed: [%s] %s", userInfoResp.Error.Code, userInfoResp.Error.Message)
	}

	openId := userInfoResp.Data.User.OpenId
	if openId == "" {
		openId = tokenResp.OpenId
	}
	if openId == "" {
		return nil, fmt.Errorf("get user info failed: empty open_id")
	}

	return &TiktokUser{
		ID:      openId,
		Name:    userInfoResp.Data.User.DisplayName,
		Picture: userInfoResp.Data.User.AvatarUrl,
	}, nil
}