using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.StaticFiles;
using System.IO.Compression;

namespace WebApplication2.Controllers
{
    [Route("api/[controller]/[action]")]
    [ApiController]
    public class ValuesController : ControllerBase
    {
        public IWebHostEnvironment _environment;
        private readonly IContentTypeProvider _contentTypeProvider;
        public ValuesController(IWebHostEnvironment e)
        {
            this._environment = e;
            _contentTypeProvider = new FileExtensionContentTypeProvider();
        }
        [HttpGet()]
        public async Task<IActionResult> DownloadImage(string imageName)
        {
            try
            {
                // 安全检查：防止路径遍历攻击
                if (imageName.Contains("..") || imageName.Contains("/") || imageName.Contains("\\"))
                {
                    return BadRequest("无效的文件名");
                }

                // 构建完整文件路径
                var imagePath = Path.Combine(_environment.ContentRootPath, "images", imageName);

                // 检查文件是否存在
                if (!System.IO.File.Exists(imagePath))
                {
                    return NotFound("图片不存在");
                }

                // 获取文件内容类型
                if (!_contentTypeProvider.TryGetContentType(imageName, out var contentType))
                {
                    contentType = "application/octet-stream";
                }

                // 读取文件并返回
                //var fileBytes = await System.IO.File.ReadAllBytesAsync(imagePath);



                var validFiles = new List<(string FileName, string FilePath)>();
                validFiles.Add((imageName, imagePath));
                var memoryStream = new MemoryStream();

                // 创建zip归档
                using (var archive = new ZipArchive(memoryStream, ZipArchiveMode.Create, true))
                {
                    foreach (var (fileName, filePath) in validFiles)
                    {
                        try
                        {
                            // 在zip中创建条目
                            var entry = archive.CreateEntry(fileName, CompressionLevel.Optimal);

                            // 写入文件内容
                            using var entryStream = entry.Open();
                            using var fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read);
                            await fileStream.CopyToAsync(entryStream);
                        }
                        catch (Exception ex)
                        {

                        }
                    }
                }
                memoryStream.Seek(0, SeekOrigin.Begin);
                // 返回zip文件
                return File(memoryStream, "application/zip", "1.zip");

                //// 重置流位置
                //return File(fileBytes, contentType, imageName);
            }
            catch (Exception ex)
            {
                return StatusCode(500, $"下载失败: {ex.Message}");
            }
        }
    }
}