using Microsoft.AspNetCore.Http.Features;
using RobotNet.SystemUpgrade;

var builder = WebApplication.CreateBuilder(args);

builder.Services.ConfigureHttpJsonOptions(options =>
{
    options.SerializerOptions.TypeInfoResolverChain.Insert(0, AppJsonSerializerContext.Default);
});

builder.WebHost.ConfigureKestrel(o =>
{
    o.Limits.MaxRequestBodySize = 2L * 1024 * 1024 * 1024; 
});

builder.Services.Configure<FormOptions>(o =>
{
    o.MultipartBodyLengthLimit = 2L * 1024 * 1024 * 1024; 
});

var app = builder.Build();


var storeDir = Path.Combine(AppContext.BaseDirectory, "store");
Directory.CreateDirectory(storeDir);


var apis = app.MapGroup("/api");


var upload = apis.MapPost("/upload", async (HttpRequest request) =>
{
    if (!request.HasFormContentType)
        return Results.BadRequest("Content-Type phải là multipart/form-data.");

    var form = await request.ReadFormAsync();
    var file = form.Files.FirstOrDefault();
    if (file is null || file.Length == 0)
        return Results.BadRequest("Không có file hoặc file rỗng.");

    var safeName = Path.GetFileName(file.FileName);
    var savePath = Path.Combine(storeDir, safeName);

    await using (var fs = new FileStream(savePath, FileMode.Create, FileAccess.Write, FileShare.None, 64 * 1024, useAsync: true))
        await file.CopyToAsync(fs);
    var nowUtc = DateTime.UtcNow;
    try
    {
        System.IO.File.SetCreationTimeUtc(savePath, nowUtc);
        System.IO.File.SetLastWriteTimeUtc(savePath, nowUtc);
    }
    catch
    {
       
    }
    var fi = new FileInfo(savePath);
    var url = $"/api/files/{Uri.EscapeDataString(fi.Name)}";
    return Results.Created(url, new UploadFileResponse(fi.Name, fi.Length, url));
});


apis.MapGet("/files", () =>
{
    var list = Directory.EnumerateFiles(storeDir)
        .Select(p => new FileInfo(p))
        .OrderByDescending(f => f.CreationTimeUtc)
        .Select(f => new FileItem(
            f.Name, f.Length, f.CreationTimeUtc,
            $"/api/files/{Uri.EscapeDataString(f.Name)}"
        ))
        .ToList();

    return Results.Ok(list);
});


apis.MapGet("/files/{name}", (string name) =>
{
    var safeName = Path.GetFileName(name);
    var path = Path.Combine(storeDir, safeName);
    if (!System.IO.File.Exists(path))
        return Results.NotFound("Không tìm thấy file.");

    return Results.File(path, "application/octet-stream", fileDownloadName: safeName);
});


apis.MapDelete("/files/{name}", (string name) =>
{
    var safeName = Path.GetFileName(name);
    var path = Path.Combine(storeDir, safeName);
    if (!System.IO.File.Exists(path))
        return Results.NotFound("Không tìm thấy file.");

    System.IO.File.Delete(path);
    return Results.NoContent();
});


app.UseStaticFiles();
app.UseDefaultFiles();
app.UseRouting();
app.MapFallbackToFile("index.html");

app.Run();