using Amazon.Runtime;
using Amazon.S3;
using Microsoft.AspNetCore.Http.Features;
using Microsoft.EntityFrameworkCore.Metadata.Internal;
using Microsoft.Extensions.Options;
using MudBlazor.Services;
using Pldpro.Web.Components;
using Pldpro.Web.Components.Pages;
using Pldpro.Web.Models;
using Pldpro.Web.Services;
using System.IO;
using System.Net.Http;
using System.Net.Mime;
using System.Net.NetworkInformation;
using System.Runtime.Intrinsics.Arm;
using static MudBlazor.CategoryTypes;
using static MudBlazor.Colors;


var builder = WebApplication.CreateBuilder(args);

// Add MudBlazor services
builder.Services.AddMudServices();

// Add services to the container.
builder.Services.AddRazorComponents()
    .AddInteractiveServerComponents();

builder.Services.AddServerSideBlazor()
    .AddCircuitOptions(options => options.DetailedErrors = true);

// HttpClient-Fabrik für serverseitige Komponenten
builder.Services.AddHttpClient();

// MySQL Repository
builder.Services.AddSingleton<IStorageMetadataRepository, StorageMetadataRepository>();



// --- S3 / RustFS Settings binding ---
builder.Services.Configure<S3Settings>(builder.Configuration.GetSection("S3"));

// Optional: größere Uploads erlauben (z. B. 512MB)
builder.Services.Configure<FormOptions>(o => { o.MultipartBodyLengthLimit = 512L * 1024 * 1024; });

// IAmazonS3 via DI (lokaler S3-kompatibler Endpoint)
builder.Services.AddSingleton<IAmazonS3>(sp =>
{
    var s = sp.GetRequiredService<IOptions<S3Settings>>().Value;
    var cfg = new Amazon.S3.AmazonS3Config
        {
        ServiceURL = s.ServiceURL,
        ForcePathStyle = s.ForcePathStyle,
        UseHttp = s.UseHttp
        // AuthenticationRegion ist bei Custom-S3 i. d. R. egal
    }
    ;
    var creds = new BasicAWSCredentials(s.AccessKey, s.SecretKey);
        return new AmazonS3Client(creds, cfg);
    });

// Domain-Service
builder.Services.AddScoped<IStorageService, S3StorageService>();

var app = builder.Build();


// Schema sicherstellen (einmalig beim Start)
using (var scope = app.Services.CreateScope())
 {
    var repo = scope.ServiceProvider.GetRequiredService<IStorageMetadataRepository>();
    await repo.EnsureSchemaAsync();
 }


// Configure the HTTP request pipeline.
if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/Error", createScopeForErrors: true);
    // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
    app.UseHsts();
}

app.UseHttpsRedirection();


app.UseAntiforgery();

app.MapStaticAssets();
app.MapRazorComponents<App>()
    .AddInteractiveServerRenderMode();


// --- Minimal APIs für Storage ---
var storage = app.MapGroup("/api/storage");

// Buckets auflisten
storage.MapGet("/buckets", async (IStorageService svc) =>
{
    var result = await svc.ListBucketsAsync();
        return Results.Ok(result);
    });

// Bucket erstellen
storage.MapPost("/buckets", async (IStorageService svc, S3CreateBucketDto dto) =>
{
        if (string.IsNullOrWhiteSpace(dto.BucketName)) return Results.BadRequest("BucketName required");
    await svc.CreateBucketAsync(dto.BucketName);
        return Results.Ok();
    }).DisableAntiforgery(); // für XHR-POST ohne Token

// Objekte eines Buckets auflisten
storage.MapGet("/buckets/{bucket}/objects", async (IStorageService svc, string bucket) =>
{
    var objects = await svc.ListObjectsAsync(bucket);
        return Results.Ok(objects);
    });

// Datei in Bucket hochladen (Form-Data: file)
storage.MapPost("/buckets/{bucket}/upload", async (HttpRequest req, IStorageService svc, IStorageMetadataRepository meta, string bucket, CancellationToken ct) =>
{
        if (!req.HasFormContentType) return Results.BadRequest("Multipart/form-data expected");
    var form = await req.ReadFormAsync();
    var file = form.Files["file"];
         if (file is null) return Results.BadRequest("'file' missing");

    var path = form["path"].ToString(); // optional, z.B. "docs/2026"
    path = string.IsNullOrWhiteSpace(path) ? null : path!.Trim().Trim('/');


    //await using var stream = file.OpenReadStream(); // Streamlimit über FormOptions konfiguriert
    // await svc.UploadObjectAsync(bucket, file.FileName, stream, file.ContentType ?? "application/octet-stream");

    // Key bauen: optionaler Pfad + Dateiname
    var key = string.IsNullOrWhiteSpace(path) ? file.FileName : $"{path}/{file.FileName}";
    await using var stream = file.OpenReadStream();
    var contentType = file.ContentType ?? "application/octet-stream";
    await svc.UploadObjectAsync(bucket, key, stream, contentType, ct);
    
        // Metadaten persistieren
    await meta.UpsertAsync(bucket, file.FileName, path, key, file.Length, contentType, ct);
    
        return Results.Ok(new { bucket, file = file.FileName, path, key });

}).DisableAntiforgery(); // für Blazor XHR Upload


// Objekt herunterladen
 storage.MapGet("/buckets/{bucket}/download/{*key}", async (IStorageService svc,string bucket,string key,CancellationToken ct) =>
{
    // key ist als Catch-all {*key} definiert, damit auch Keys mit "/" (Prefix/Ordner) funktionieren.
    var(stream, contentType, length) = await svc.GetObjectAsync(bucket, key, ct);
    
    // Dateiname aus Key ableiten:
    var fileName = key.Split('/', StringSplitOptions.RemoveEmptyEntries).LastOrDefault() ?? key;
    
    return Results.File(
    fileStream: stream,
    contentType: contentType,
    fileDownloadName: fileName,
    enableRangeProcessing: true,     // erlaubt Resume/Teildownloads
    lastModified: null,              // optional: Last-Modified selbst setzen
    entityTag: null);                // optional: ETag setzen
    });

storage.MapGet("/buckets/{bucket}/files/{fileName}/download", async (
    IStorageService svc,
    IStorageMetadataRepository meta,
    string bucket,
    string fileName,
    CancellationToken ct) =>
{
    var entry = await meta.TryGetAsync(bucket, fileName, ct);
    if (entry is null) return Results.NotFound($"No metadata for {bucket}/{fileName}");

    var (stream, contentType, _) = await svc.GetObjectAsync(bucket, entry.Key, ct);
    return Results.File(stream, contentType, fileName, enableRangeProcessing: true);
});


storage.MapDelete("/buckets/{bucket}/objects/{*key}", async(
IStorageService svc,
IStorageMetadataRepository meta,
string bucket,
string key,
CancellationToken ct) =>
 {
    await svc.DeleteObjectAsync(bucket, key);
    await meta.DeleteByKeyAsync(bucket, key, ct);
         return Results.NoContent();
     }).DisableAntiforgery(); 




app.Run();