using System.IO;
using GxPress.Service.Interface.Video;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.StaticFiles;
using Microsoft.Extensions.Caching.Distributed;
namespace GxPress.Api.AppControllers
{
    /// <summary>
    /// 访问
    /// </summary>
    [Route("/api/app/video")]
    [ApiController]
    [Authorize]
    public class VideoController : ControllerBase
    {
        private readonly IWebHostEnvironment _environment;
        private readonly IDistributedCache _cache;
        private readonly IVideoService videoService;
        public VideoController(IWebHostEnvironment environment, IDistributedCache cache, IVideoService videoService)
        {
            _environment = environment;
            _cache = cache;
            this.videoService = videoService;
        }
        /// <summary>
        /// 
        /// </summary>
        /// <returns></returns>
        [HttpGet]
        [AllowAnonymous]
        public IActionResult GetVideo(int page)
        {
            try
            {
                var path = Common.Tools.StringUtils.GetWebRootPath(_environment.WebRootPath);
                var filepath = path + "/cache/20200428/music.mp4";
                FileInfo fileInfo = new FileInfo(filepath);
                var key = $"music.mp4{page}";
                var result = _cache.Get(key);
                if (result != null)
                {
                    return File(result, "application/octet-stream", fileInfo.Name);
                }
                var blength = 1024 * 1024 * 5;
                byte[] bytsize = new byte[blength];
                //获取文件名后缀
                string extension = Path.GetExtension(filepath);
                //
                videoService.RedisVideo(filepath, bytsize, blength, "music.mp4");
                //获取文件流
                using (FileStream stream = new FileStream(filepath, FileMode.OpenOrCreate, FileAccess.ReadWrite))
                {
                    while (true)
                    {
                        int r = stream.Read(bytsize, 0, blength);
                        //如果读取到的字节数为0，说明已到达文件结尾，则退出while循
                        break;
                    }
                    stream.Close();
                }
                //获取后缀名
                var ext = fileInfo.Extension;
                new FileExtensionContentTypeProvider().Mappings.TryGetValue(ext, out var contenttype);
                return File(bytsize, contenttype ?? "application/octet-stream", fileInfo.Name);
            }
            catch (FileNotFoundException e)
            {
                throw new Common.Exceptions.BusinessException(e.Message);
            }
            catch (IOException e)
            {
                throw new Common.Exceptions.BusinessException(e.Message);
            }
        }
    }
}