using System;
using System.Net;
using System.Net.Http;
using System.Web.Http;
using RevitHttpControl.Models;

namespace RevitHttpControl.Common
{
    /// <summary>
    /// 扩展方法类
    /// </summary>
    public static class Extensions
    {
        /// <summary>
        /// 创建成功响应
        /// </summary>
        /// <typeparam name="T">数据类型</typeparam>
        /// <param name="controller">控制器实例</param>
        /// <param name="data">响应数据</param>
        /// <param name="message">响应消息</param>
        /// <param name="statusCode">HTTP状态码</param>
        /// <returns>HTTP响应消息</returns>
        public static HttpResponseMessage CreateSuccessResponse<T>(this ApiController controller, T data, 
            string message = "操作成功", HttpStatusCode statusCode = HttpStatusCode.OK)
        {
            var response = new ApiResponse<T>
            {
                Success = true,
                Code = (int)statusCode,
                Message = message,
                Data = data
            };

            return controller.Request.CreateResponse(statusCode, response);
        }

        /// <summary>
        /// 创建错误响应
        /// </summary>
        /// <param name="controller">控制器实例</param>
        /// <param name="errorCode">错误码</param>
        /// <param name="message">错误消息</param>
        /// <param name="statusCode">HTTP状态码</param>
        /// <param name="errorDescription">详细错误描述</param>
        /// <returns>HTTP响应消息</returns>
        public static HttpResponseMessage CreateErrorResponse(this ApiController controller, string errorCode,
            string message, HttpStatusCode statusCode = HttpStatusCode.InternalServerError, 
            string errorDescription = null)
        {
            var errorData = new
            {
                error = errorCode,
                errorDescription = errorDescription
            };

            var response = new ApiResponse<object>
            {
                Success = false,
                Code = (int)statusCode,
                Message = message,
                Data = errorData
            };

            return controller.Request.CreateResponse(statusCode, response);
        }

        /// <summary>
        /// 创建验证错误响应
        /// </summary>
        /// <param name="controller">控制器实例</param>
        /// <param name="message">验证错误消息</param>
        /// <returns>HTTP响应消息</returns>
        public static HttpResponseMessage CreateValidationErrorResponse(this ApiController controller, string message)
        {
            return controller.CreateErrorResponse(ErrorCodes.INVALID_REQUEST, message, HttpStatusCode.BadRequest);
        }

        /// <summary>
        /// 创建未找到错误响应
        /// </summary>
        /// <param name="controller">控制器实例</param>
        /// <param name="resourceName">资源名称</param>
        /// <returns>HTTP响应消息</returns>
        public static HttpResponseMessage CreateNotFoundResponse(this ApiController controller, string resourceName = "资源")
        {
            return controller.CreateErrorResponse(ErrorCodes.TASK_NOT_FOUND, $"{resourceName}不存在", HttpStatusCode.NotFound);
        }

        /// <summary>
        /// 创建异步任务响应
        /// </summary>
        /// <param name="controller">控制器实例</param>
        /// <param name="taskId">任务ID</param>
        /// <param name="message">响应消息</param>
        /// <returns>HTTP响应消息</returns>
        public static HttpResponseMessage CreateAsyncTaskResponse(this ApiController controller, Guid taskId, 
            string message = "异步任务已创建")
        {
            var asyncResponse = new AsyncOperationResponse
            {
                TaskId = taskId,
                StatusUrl = $"/api/task/{taskId}"
            };

            return controller.CreateSuccessResponse(asyncResponse, message, HttpStatusCode.Accepted);
        }

        /// <summary>
        /// 验证是否为空或空字符串
        /// </summary>
        /// <param name="value">字符串值</param>
        /// <returns>是否为空</returns>
        public static bool IsNullOrWhiteSpace(this string value)
        {
            return string.IsNullOrWhiteSpace(value);
        }

        /// <summary>
        /// 安全获取文件名
        /// </summary>
        /// <param name="filePath">文件路径</param>
        /// <returns>文件名</returns>
        public static string SafeGetFileName(this string filePath)
        {
            try
            {
                return System.IO.Path.GetFileName(filePath);
            }
            catch
            {
                return filePath;
            }
        }

        /// <summary>
        /// 任务状态转换为中文描述
        /// </summary>
        /// <param name="status">任务状态</param>
        /// <returns>中文描述</returns>
        public static string ToChineseDescription(this TaskStatus status)
        {
            switch (status)
            {
                case TaskStatus.Pending:
                    return "等待中";
                case TaskStatus.Running:
                    return "运行中";
                case TaskStatus.Completed:
                    return "已完成";
                case TaskStatus.Failed:
                    return "失败";
                case TaskStatus.Cancelled:
                    return "已取消";
                default:
                    return "未知状态";
            }
        }

        /// <summary>
        /// 统计类型转换为中文描述
        /// </summary>
        /// <param name="type">统计类型</param>
        /// <returns>中文描述</returns>
        public static string ToChineseDescription(this StatsType type)
        {
            switch (type)
            {
                case StatsType.Wall:
                    return "墙";
                case StatsType.Door:
                    return "门";
                case StatsType.Window:
                    return "窗";
                case StatsType.Floor:
                    return "楼板";
                case StatsType.Ceiling:
                    return "天花板";
                case StatsType.Roof:
                    return "屋顶";
                case StatsType.Column:
                    return "柱";
                case StatsType.Beam:
                    return "梁";
                case StatsType.Furniture:
                    return "家具";
                case StatsType.Room:
                    return "房间";
                default:
                    return "未知类型";
            }
        }

        /// <summary>
        /// 验证 GUID 是否有效
        /// </summary>
        /// <param name="guid">GUID值</param>
        /// <returns>是否有效</returns>
        public static bool IsValidGuid(this Guid guid)
        {
            return guid != Guid.Empty;
        }

        /// <summary>
        /// 安全转换为 DateTime（UTC）
        /// </summary>
        /// <param name="dateTime">本地时间</param>
        /// <returns>UTC时间</returns>
        public static DateTime ToUtcSafe(this DateTime dateTime)
        {
            return dateTime.Kind == DateTimeKind.Utc ? dateTime : dateTime.ToUniversalTime();
        }

        /// <summary>
        /// 格式化文件大小
        /// </summary>
        /// <param name="bytes">字节数</param>
        /// <returns>格式化后的文件大小</returns>
        public static string FormatFileSize(this long bytes)
        {
            if (bytes < 1024)
                return $"{bytes} B";
            if (bytes < 1024 * 1024)
                return $"{bytes / 1024:F1} KB";
            if (bytes < 1024 * 1024 * 1024)
                return $"{bytes / (1024 * 1024):F1} MB";
            return $"{bytes / (1024 * 1024 * 1024):F1} GB";
        }
    }
}