package handler

import (
	"net/http"
	"strconv"

	"github.com/gin-gonic/gin"
	"github.com/rs/zerolog/log"
	"tss-rocks-be/internal/types"
	"fmt"
)

type UpdateCurrentUserRequest struct {
	Email           string `json:"email,omitempty" binding:"omitempty,email"`
	CurrentPassword string `json:"current_password,omitempty"`
	NewPassword     string `json:"new_password,omitempty" binding:"omitempty,min=8"`
	DisplayName     string `json:"display_name,omitempty" binding:"omitempty,max=64"`
}

type CreateUserRequest struct {
	Email       string `json:"email" binding:"required,email"`
	Password    string `json:"password" binding:"required,min=8"`
	Role        string `json:"role" binding:"required,oneof=admin editor"`
	DisplayName string `json:"display_name,omitempty" binding:"omitempty,max=64"`
}

type UpdateUserRequest struct {
	Email       string `json:"email,omitempty" binding:"omitempty,email"`
	Password    string `json:"password,omitempty" binding:"omitempty,min=8"`
	Role        string `json:"role,omitempty" binding:"omitempty,oneof=admin editor"`
	Status      string `json:"status,omitempty" binding:"omitempty,oneof=active inactive"`
	DisplayName string `json:"display_name,omitempty" binding:"omitempty,max=64"`
}

// ListUsers returns a list of users
func (h *Handler) ListUsers(c *gin.Context) {
	// Parse query parameters
	params := &types.ListUsersParams{
		Page:    1,
		PerPage: 10,
	}

	if page := c.Query("page"); page != "" {
		if p, err := strconv.Atoi(page); err == nil && p > 0 {
			params.Page = p
		}
	}

	if perPage := c.Query("per_page"); perPage != "" {
		if pp, err := strconv.Atoi(perPage); err == nil && pp > 0 {
			params.PerPage = pp
		}
	}

	params.Sort = c.Query("sort")
	params.Role = c.Query("role")
	params.Status = c.Query("status")
	params.Email = c.Query("email")

	// Get users
	users, err := h.service.ListUsers(c.Request.Context(), params)
	if err != nil {
		log.Error().Err(err).Msg("Failed to list users")
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to list users"})
		return
	}

	c.JSON(http.StatusOK, gin.H{
		"data": users,
	})
}

// CreateUser creates a new user
func (h *Handler) CreateUser(c *gin.Context) {
	var req CreateUserRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	user, err := h.service.CreateUser(c.Request.Context(), req.Email, req.Email, req.Password, req.Role)
	if err != nil {
		log.Error().Err(err).Msg("Failed to create user")
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to create user"})
		return
	}

	c.JSON(http.StatusCreated, gin.H{
		"data": user,
	})
}

// GetUser returns user details
func (h *Handler) GetUser(c *gin.Context) {
	id, err := strconv.Atoi(c.Param("id"))
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid user ID"})
		return
	}

	user, err := h.service.GetUser(c.Request.Context(), id)
	if err != nil {
		log.Error().Err(err).Msg("Failed to get user")
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to get user"})
		return
	}

	c.JSON(http.StatusOK, gin.H{
		"data": user,
	})
}

// UpdateUser updates user information
func (h *Handler) UpdateUser(c *gin.Context) {
	id, err := strconv.Atoi(c.Param("id"))
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid user ID"})
		return
	}

	var req UpdateUserRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	user, err := h.service.UpdateUser(c.Request.Context(), id, &types.UpdateUserInput{
		Email:       req.Email,
		Password:    req.Password,
		Role:        req.Role,
		Status:      req.Status,
		DisplayName: req.DisplayName,
	})
	if err != nil {
		log.Error().Err(err).Msg("Failed to update user")
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to update user"})
		return
	}

	c.JSON(http.StatusOK, gin.H{
		"data": user,
	})
}

// DeleteUser deletes a user
func (h *Handler) DeleteUser(c *gin.Context) {
	id, err := strconv.Atoi(c.Param("id"))
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid user ID"})
		return
	}

	if err := h.service.DeleteUser(c.Request.Context(), id); err != nil {
		log.Error().Err(err).Msg("Failed to delete user")
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to delete user"})
		return
	}

	c.Status(http.StatusNoContent)
}

// GetCurrentUser returns the current user's information
func (h *Handler) GetCurrentUser(c *gin.Context) {
	userID, exists := c.Get("user_id")
	if !exists {
		c.JSON(http.StatusUnauthorized, gin.H{"error": "Unauthorized"})
		return
	}

	// 将用户ID转换为int64
	var id int64
	switch v := userID.(type) {
	case int64:
		id = v
	case int:
		id = int64(v)
	case float64:
		id = int64(v)
	case string:
		// 尝试将字符串转换为int64
		parsedID, err := strconv.ParseInt(v, 10, 64)
		if err != nil {
			log.Error().
				Err(err).
				Str("user_id", v).
				Msg("Failed to parse user_id string")
			c.JSON(http.StatusInternalServerError, gin.H{"error": "Invalid user_id format"})
			return
		}
		id = parsedID
	default:
		log.Error().
			Str("type", fmt.Sprintf("%T", userID)).
			Interface("value", userID).
			Msg("Invalid user_id type")
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Invalid user_id type"})
		return
	}

	// 获取用户信息
	user, err := h.service.GetUser(c.Request.Context(), int(id))
	if err != nil {
		log.Error().Err(err).Msg("Failed to get user")
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to get user information"})
		return
	}

	c.JSON(http.StatusOK, user)
}

// UpdateCurrentUser updates the current user's information
func (h *Handler) UpdateCurrentUser(c *gin.Context) {
	// 从上下文中获取用户ID（由认证中间件设置）
	userID, exists := c.Get("user_id")
	if !exists {
		c.JSON(http.StatusUnauthorized, gin.H{"error": "Unauthorized"})
		return
	}

	var req UpdateCurrentUserRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	// 如果要更新密码，需要验证当前密码
	if req.NewPassword != "" {
		if req.CurrentPassword == "" {
			c.JSON(http.StatusBadRequest, gin.H{"error": "Current password is required to update password"})
			return
		}

		// 验证当前密码
		if err := h.service.VerifyPassword(c.Request.Context(), userID.(int), req.CurrentPassword); err != nil {
			c.JSON(http.StatusUnauthorized, gin.H{"error": "Invalid current password"})
			return
		}
	}

	// 更新用户信息
	user, err := h.service.UpdateUser(c.Request.Context(), userID.(int), &types.UpdateUserInput{
		Email:       req.Email,
		Password:    req.NewPassword,
		DisplayName: req.DisplayName,
	})
	if err != nil {
		log.Error().Err(err).Msg("Failed to update user")
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to update user information"})
		return
	}

	c.JSON(http.StatusOK, gin.H{
		"data": user,
	})
}