package controllers

import (
	"hr_receiver/config"
	"hr_receiver/models"
	"hr_receiver/util"
	"net/http"

	"github.com/gin-gonic/gin"
)

type LoginRequest struct {
	Username string `json:"username" binding:"required"`
	Password string `json:"password" binding:"required"`
}

type RegisterRequest struct {
	Username   string                `json:"username" form:"username"`
	Password   string                `json:"password" form:"password"`
	Email      *string               `json:"email" form:"email"`
	Phone      *string               `json:"phone" form:"phone"`
	Role       models.UserRole       `json:"role" form:"role"`
	FlavorType models.UserFlavorType `json:"flavorType" form:"flavorType"`
	RegionIDs  []uint32              `json:"regionIds" form:"regionIds"`
}

type AuthResponse struct {
	Token string      `json:"token"`
	User  models.User `json:"user"`
}

// @Summary 用户注册
// @Description 注册新用户，返回JWT Token
// @Tags 认证
// @Accept json
// @Produce json
// @Param request body SwagRegisterRequest true "注册信息"
// @Success 201 {object} SwagAPIResponse "注册成功"
// @Failure 400 {object} SwagAPIResponse "请求参数错误"
// @Failure 409 {object} SwagAPIResponse "用户名已存在"
// @Router /register [post]
func Register(c *gin.Context) {
	var req RegisterRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	// 检查用户名是否已存在
	var existingUser models.User
	if result := config.DB.Where("username = ?", req.Username).First(&existingUser); result.Error == nil {
		c.JSON(http.StatusConflict, gin.H{"error": "Username already exists"})
		return
	}

	// 创建新用户
	user := models.User{
		Username:   req.Username,
		Email:      req.Email,
		Phone:      req.Phone,
		Password:   req.Password, // BeforeCreate钩子会自动加密
		Role:       req.Role,
		FlavorType: req.FlavorType,
		Regions:    buildUserRegionBindings(req.RegionIDs),
	}

	if result := config.DB.Create(&user); result.Error != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to create user"})
		return
	}

	// 生成Token
	token, err := util.GenerateToken(&user)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to generate token"})
		return
	}

	c.JSON(http.StatusCreated, AuthResponse{
		Token: token,
		User:  user,
	})
}

// @Summary 用户登录
// @Description 用户名密码登录，返回JWT Token和用户信息
// @Tags 认证
// @Accept json
// @Produce json
// @Param request body SwagLoginRequest true "登录信息"
// @Success 200 {object} SwagAPIResponse "登录成功"
// @Failure 400 {object} SwagAPIResponse "请求参数错误"
// @Failure 401 {object} SwagAPIResponse "用户名或密码错误"
// @Failure 403 {object} SwagAPIResponse "用户已禁用"
// @Router /login [post]
func Login(c *gin.Context) {
	var req LoginRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	// 查找用户
	var user models.User
	result := config.DB.Preload("Regions").Where("username = ?", req.Username).First(&user)

	if result.Error != nil {
		c.JSON(http.StatusUnauthorized, gin.H{"error": "Invalid username or password"})
		return
	}

	// 验证密码
	if !user.CheckPassword(req.Password) {
		c.JSON(http.StatusUnauthorized, gin.H{"error": "Invalid username or password"})
		return
	}
	if !user.IsActive {
		c.JSON(http.StatusForbidden, gin.H{"error": "User is disabled"})
		return
	}

	// 生成JWT Token
	token, err := util.GenerateToken(&user)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to generate token"})
		return
	}

	c.JSON(http.StatusOK, AuthResponse{
		Token: token,
		User:  user,
	})
}

// GetProfile 获取用户信息（需要认证）
func GetProfile(c *gin.Context) {
	userID, exists := c.Get("userID")
	if !exists {
		c.JSON(http.StatusUnauthorized, gin.H{"error": "Unauthorized"})
		return
	}

	var user models.User
	if result := config.DB.Preload("Regions").First(&user, userID); result.Error != nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "User not found"})
		return
	}

	c.JSON(http.StatusOK, user)
}

func buildUserRegionBindings(regionIDs []uint32) []models.UserRegionBinding {
	if len(regionIDs) == 0 {
		return nil
	}
	seen := make(map[uint32]struct{}, len(regionIDs))
	regions := make([]models.UserRegionBinding, 0, len(regionIDs))
	for _, regionID := range regionIDs {
		if regionID == 0 {
			continue
		}
		if _, exists := seen[regionID]; exists {
			continue
		}
		seen[regionID] = struct{}{}
		regions = append(regions, models.UserRegionBinding{RegionID: regionID})
	}
	return regions
}