package handler

import (
	"github.com/gin-gonic/gin"

	"github.com/sundynix/pets-be/internal/middleware"
	"github.com/sundynix/pets-be/internal/model"
	appjwt "github.com/sundynix/pets-be/pkg/jwt"
	"github.com/sundynix/pets-be/pkg/response"
)

type loginReq struct {
	Nickname string `json:"nickname"`
}

// userTokens 签发小程序用户的「access + refresh」令牌对。
// access token 只有 2 小时，前端过期后拿 refresh_token 静默续期。
func (h *Handler) userTokens(user *model.User) (gin.H, error) {
	token, err := h.jwt.Generate(user.ID, appjwt.KindUser, user.Nickname, "")
	if err != nil {
		return nil, err
	}
	refresh, refreshExp, err := h.svc.IssueRefreshToken(string(appjwt.KindUser), user.ID)
	if err != nil {
		return nil, err
	}
	return gin.H{
		"token":              token,
		"refresh_token":      refresh,
		"expires_in":         h.jwt.ExpireSeconds(),
		"refresh_expires_at": refreshExp,
		"user":               user,
	}, nil
}

// Login 开发态 Mock 登录
func (h *Handler) Login(c *gin.Context) {
	if !h.cfg.Auth.DevLogin {
		response.Fail(c, 40300, "开发登录未开启，请使用微信登录")
		return
	}
	var req loginReq
	_ = c.ShouldBindJSON(&req)

	user, err := h.svc.MockLogin(req.Nickname)
	if err != nil {
		response.FailErr(c, err)
		return
	}
	data, err := h.userTokens(user)
	if err != nil {
		response.FailErr(c, err)
		return
	}
	response.OK(c, data)
}

type wechatLoginReq struct {
	Code     string `json:"code"`
	Nickname string `json:"nickname"`
	Avatar   string `json:"avatar"`
}

// WechatLogin 微信小程序登录：前端 wx.login 拿 code 传入
func (h *Handler) WechatLogin(c *gin.Context) {
	var req wechatLoginReq
	if err := c.ShouldBindJSON(&req); err != nil {
		response.FailParams(c, err.Error())
		return
	}
	if req.Code == "" {
		response.FailParams(c, "缺少 code")
		return
	}
	user, err := h.svc.WechatLogin(req.Code)
	if err != nil {
		response.Fail(c, 40100, err.Error())
		return
	}
	// 可选：首次登录写入用户授权的昵称/头像
	if fields := map[string]any{}; true {
		if req.Nickname != "" && user.Nickname == "微信用户" {
			fields["nickname"] = req.Nickname
		}
		if req.Avatar != "" && user.Avatar == "" {
			fields["avatar"] = req.Avatar
		}
		if len(fields) > 0 {
			if u, e := h.svc.UpdateUser(user.ID, fields); e == nil {
				user = u
			}
		}
	}
	data, err := h.userTokens(user)
	if err != nil {
		response.FailErr(c, err)
		return
	}
	response.OK(c, data)
}

type refreshReq struct {
	RefreshToken string `json:"refresh_token"`
}

// RefreshToken POST /api/auth/refresh
// 用刷新令牌换新的 access token；刷新令牌本身也会轮换，旧的立即失效。
func (h *Handler) RefreshToken(c *gin.Context) {
	var req refreshReq
	_ = c.ShouldBindJSON(&req)

	userID, err := h.svc.ConsumeRefreshToken(req.RefreshToken, string(appjwt.KindUser))
	if err != nil {
		response.Fail(c, 40100, err.Error())
		return
	}
	user, err := h.svc.GetUser(userID)
	if err != nil {
		response.Fail(c, 40100, "登录已失效，请重新登录")
		return
	}
	if user.Disabled {
		response.Fail(c, 40300, "账号已被禁用")
		return
	}
	data, err := h.userTokens(user)
	if err != nil {
		response.FailErr(c, err)
		return
	}
	response.OK(c, data)
}

// Logout POST /api/auth/logout 作废当前刷新令牌
func (h *Handler) Logout(c *gin.Context) {
	var req refreshReq
	_ = c.ShouldBindJSON(&req)
	h.svc.RevokeRefreshToken(req.RefreshToken, string(appjwt.KindUser))
	response.OK(c, gin.H{"ok": true})
}

// Profile 当前用户资料
func (h *Handler) Profile(c *gin.Context) {
	user, err := h.svc.GetUser(middleware.UserID(c))
	if err != nil {
		response.FailErr(c, err)
		return
	}
	response.OK(c, user)
}

type updateProfileReq struct {
	Nickname     *string `json:"nickname"`
	Avatar       *string `json:"avatar"`
	AvatarFileID *string `json:"avatar_file_id"`
	Phone        *string `json:"phone"`
}

// UpdateProfile 更新资料
func (h *Handler) UpdateProfile(c *gin.Context) {
	var req updateProfileReq
	if err := c.ShouldBindJSON(&req); err != nil {
		response.FailParams(c, err.Error())
		return
	}
	fields := map[string]any{}
	if req.Nickname != nil {
		fields["nickname"] = *req.Nickname
	}
	if req.Avatar != nil {
		fields["avatar"] = *req.Avatar
	}
	if req.AvatarFileID != nil {
		fields["avatar_file_id"] = *req.AvatarFileID
	}
	if req.Phone != nil {
		fields["phone"] = *req.Phone
	}
	user, err := h.svc.UpdateUser(middleware.UserID(c), fields)
	if err != nil {
		response.FailErr(c, err)
		return
	}
	response.OK(c, user)
}