using Microsoft.AspNetCore.Mvc;

namespace DRS9.Dashboard.Server.Controllers;

[ApiController]
[Route("api/admin/[controller]")]
// [Authorize] - 暂时禁用认证以便测试
public class UploadController : ControllerBase
{
    private readonly IWebHostEnvironment _environment;
    private readonly ILogger<UploadController> _logger;

    // 允许的图片扩展名
    private static readonly string[] ImageExtensions = { ".png", ".jpg", ".jpeg", ".gif", ".bmp", ".svg", ".webp" };
    // 允许的视频扩展名
    private static readonly string[] VideoExtensions = { ".mp4", ".webm", ".ogg", ".mov", ".avi", ".mkv" };
    // 最大文件大小 (50MB)
    private const long MaxFileSize = 50 * 1024 * 1024;

    public UploadController(IWebHostEnvironment environment, ILogger<UploadController> logger)
    {
        _environment = environment;
        _logger = logger;
    }

    /// <summary>
    /// 上传文件（图片或视频）
    /// </summary>
    [HttpPost]
    public async Task<ActionResult<object>> UploadFile(IFormFile file)
    {
        if (file == null || file.Length == 0)
        {
            return BadRequest(new { success = false, message = "请选择文件" });
        }

        // 检查文件大小
        if (file.Length > MaxFileSize)
        {
            return BadRequest(new { success = false, message = $"文件大小不能超过 {MaxFileSize / 1024 / 1024}MB" });
        }

        var extension = Path.GetExtension(file.FileName).ToLowerInvariant();

        // 确定文件类型
        string itemType;
        string subFolder;

        if (ImageExtensions.Contains(extension))
        {
            itemType = "Image";
            subFolder = "images";
        }
        else if (VideoExtensions.Contains(extension))
        {
            itemType = "Video";
            subFolder = "videos";
        }
        else
        {
            return BadRequest(new { success = false, message = "不支持的文件类型，请上传图片或视频" });
        }

        try
        {
            // 创建上传目录
            var uploadsFolder = Path.Combine(_environment.WebRootPath, "uploads", subFolder);
            if (!Directory.Exists(uploadsFolder))
            {
                Directory.CreateDirectory(uploadsFolder);
            }

            // 生成唯一文件名
            var uniqueFileName = $"{Guid.NewGuid()}{extension}";
            var filePath = Path.Combine(uploadsFolder, uniqueFileName);

            // 保存文件
            using (var stream = new FileStream(filePath, FileMode.Create))
            {
                await file.CopyToAsync(stream);
            }

            // 返回文件 URL
            var fileUrl = $"/uploads/{subFolder}/{uniqueFileName}";

            _logger.LogInformation("文件上传成功: {FileName} -> {Url}", file.FileName, fileUrl);

            return Ok(new
            {
                success = true,
                message = "上传成功",
                url = fileUrl,
                itemType = itemType,
                fileName = file.FileName
            });
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "文件上传失败");
            return StatusCode(500, new { success = false, message = $"上传失败: {ex.Message}" });
        }
    }

    /// <summary>
    /// 批量上传文件
    /// </summary>
    [HttpPost("batch")]
    public async Task<ActionResult<object>> UploadFiles(List<IFormFile> files)
    {
        if (files == null || files.Count == 0)
        {
            return BadRequest(new { success = false, message = "请选择文件" });
        }

        var results = new List<object>();
        var successCount = 0;
        var failCount = 0;

        foreach (var file in files)
        {
            var result = await UploadSingleFile(file);
            if (result.success)
            {
                successCount++;
            }
            else
            {
                failCount++;
            }
            results.Add(new
            {
                fileName = file.FileName,
                success = result.success,
                message = result.message,
                url = result.url,
                itemType = result.itemType
            });
        }

        return Ok(new
        {
            success = true,
            message = $"上传完成: {successCount} 个成功, {failCount} 个失败",
            results = results
        });
    }

    private async Task<(bool success, string message, string? url, string? itemType)> UploadSingleFile(IFormFile file)
    {
        if (file == null || file.Length == 0)
        {
            return (false, "请选择文件", null, null);
        }

        if (file.Length > MaxFileSize)
        {
            return (false, $"文件大小不能超过 {MaxFileSize / 1024 / 1024}MB", null, null);
        }

        var extension = Path.GetExtension(file.FileName).ToLowerInvariant();

        string itemType;
        string subFolder;

        if (ImageExtensions.Contains(extension))
        {
            itemType = "Image";
            subFolder = "images";
        }
        else if (VideoExtensions.Contains(extension))
        {
            itemType = "Video";
            subFolder = "videos";
        }
        else
        {
            return (false, "不支持的文件类型", null, null);
        }

        try
        {
            var uploadsFolder = Path.Combine(_environment.WebRootPath, "uploads", subFolder);
            if (!Directory.Exists(uploadsFolder))
            {
                Directory.CreateDirectory(uploadsFolder);
            }

            var uniqueFileName = $"{Guid.NewGuid()}{extension}";
            var filePath = Path.Combine(uploadsFolder, uniqueFileName);

            using (var stream = new FileStream(filePath, FileMode.Create))
            {
                await file.CopyToAsync(stream);
            }

            var fileUrl = $"/uploads/{subFolder}/{uniqueFileName}";
            return (true, "上传成功", fileUrl, itemType);
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "文件上传失败: {FileName}", file.FileName);
            return (false, $"上传失败: {ex.Message}", null, null);
        }
    }

    /// <summary>
    /// 删除文件
    /// </summary>
    [HttpDelete]
    public ActionResult DeleteFile([FromBody] FileDeleteRequest request)
    {
        if (string.IsNullOrWhiteSpace(request.Url))
        {
            return BadRequest(new { success = false, message = "请提供文件 URL" });
        }

        try
        {
            // 从 URL 中提取文件路径
            var filePath = Path.Combine(_environment.WebRootPath, request.Url.TrimStart('/'));

            if (System.IO.File.Exists(filePath))
            {
                System.IO.File.Delete(filePath);
                _logger.LogInformation("文件删除成功: {Url}", request.Url);
                return Ok(new { success = true, message = "删除成功" });
            }
            else
            {
                return NotFound(new { success = false, message = "文件不存在" });
            }
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "文件删除失败: {Url}", request.Url);
            return StatusCode(500, new { success = false, message = $"删除失败: {ex.Message}" });
        }
    }
}

public class FileDeleteRequest
{
    public string Url { get; set; } = string.Empty;
}