package response

import (
	"net/http"

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

// Response 统一响应结构
type Response struct {
	Code    int         `json:"code"`
	Message string      `json:"message"`
	Data    interface{} `json:"data,omitempty"`
}

// ResponseSnakeCase 统一响应结构(snake_case)
type ResponseSnakeCase struct {
	Code    int         `json:"code"`
	Message string      `json:"message"`
	Data    interface{} `json:"data,omitempty"`
}

// Success 成功响应
func Success(c *gin.Context, data interface{}) {
	c.JSON(http.StatusOK, Response{
		Code:    0,
		Message: "success",
		Data:    data,
	})
}

// SuccessWithMessage 成功响应带消息
func SuccessWithMessage(c *gin.Context, message string, data interface{}) {
	c.JSON(http.StatusOK, Response{
		Code:    0,
		Message: message,
		Data:    data,
	})
}

// Error 错误响应
func Error(c *gin.Context, code int, message string) {
	c.JSON(http.StatusBadRequest, Response{
		Code:    code,
		Message: message,
	})
}

// ErrorWithStatusCode 带状态码的错误响应
func ErrorWithStatusCode(c *gin.Context, statusCode int, code int, message string) {
	c.JSON(statusCode, Response{
		Code:    code,
		Message: message,
	})
}

// BadRequest 参数错误
func BadRequest(c *gin.Context, message string) {
	ErrorWithStatusCode(c, http.StatusBadRequest, 400, message)
}

// Unauthorized 未授权
func Unauthorized(c *gin.Context, message string) {
	if message == "" {
		message = "unauthorized"
	}
	ErrorWithStatusCode(c, http.StatusUnauthorized, 401, message)
}

// Forbidden 禁止访问
func Forbidden(c *gin.Context, message string) {
	if message == "" {
		message = "forbidden"
	}
	ErrorWithStatusCode(c, http.StatusForbidden, 403, message)
}

// NotFound 资源不存在
func NotFound(c *gin.Context, message string) {
	if message == "" {
		message = "resource not found"
	}
	ErrorWithStatusCode(c, http.StatusNotFound, 404, message)
}

// InternalServerError 服务器内部错误
func InternalServerError(c *gin.Context, message string) {
	if message == "" {
		message = "internal server error"
	}
	ErrorWithStatusCode(c, http.StatusInternalServerError, 500, message)
}

// PaginatedResponse 分页响应
type PaginatedResponse struct {
	List       interface{} `json:"list"`
	Total      int64       `json:"total"`
	Page       int         `json:"page"`
	PageSize   int         `json:"page_size"`
	TotalPages int         `json:"total_pages"`
}

// Paginated 分页成功响应
func Paginated(c *gin.Context, list interface{}, total int64, page, pageSize int) {
	totalPages := int(total) / pageSize
	if int(total)%pageSize > 0 {
		totalPages++
	}

	Success(c, PaginatedResponse{
		List:       list,
		Total:      total,
		Page:       page,
		PageSize:   pageSize,
		TotalPages: totalPages,
	})
}