using Ips.Library.Basic;
using Ips.Library.WebApi;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.StaticFiles;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Hosting;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Ips.Service.CapServer.Controllers
{
    /// <summary>
    /// 文件操作接口
    /// 可通过浏览器访问http://{baseurl}/data预览文件
    /// </summary>
    public class AdFileController : BaseController
    {
        /// <summary>
        /// 下载采集的文件
        /// </summary>
        /// <param name="fileName">采集返回的名称</param>
        /// <returns></returns>
        [HttpGet]
        public IActionResult Download(string fileName)
        {
            if (string.IsNullOrWhiteSpace(fileName))
            {
                return NotFound("必须指定要下载的文件");
            }
            if (fileName.StartsWith("/"))
                fileName = fileName.Substring(1);
            string localFile = Path.Combine(AppConst.DataDir, fileName);
            try
            {
                if (!System.IO.File.Exists(localFile))
                {
                    IpsLogger.Error($"下载失败,文件[{localFile}]不存在");
                    return NotFound($"文件[{fileName}]不存在");
                }
                var fileStream = new FileStream(localFile, FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite, 4096, true);  //异步读取文件
                return File(fileStream, "application/octet-stream", fileName, true);  //为true时，支持断点续传
            }
            catch (Exception ex)
            {
                IpsLogger.Error($"文件[{localFile}]下载失败", ex);
                return NotFound($"文件[{fileName}]下载失败");
            }
        }

    }
}