using System.Net.Sockets;

using MeWeb.Shared;

namespace MeWeb.Server;

public static class ServerApi
{
  public static WebApplication MapMeWebApi(this WebApplication app)
  {
    app.MapGet(Endpoints.Server.GET_Info, Info);
    app.MapGet(Endpoints.Server.GET_Ip, Ip);
    app.MapGet(Endpoints.Downloads.GET_Page, Page);
    app.MapGet(Endpoints.Downloads.GET_Platform, Download);
    return app;
  }

  static ViewInfo Info() => new() { Version = BuildInfo.Version, Commit = BuildInfo.Commit, BuiltAt = BuildInfo.BuiltAt };

  static IResult Ip(HttpContext context)
  {
    var address = context.Connection.RemoteIpAddress;
    if (address is null) return Results.BadRequest();
    if (address.IsIPv4MappedToIPv6) address = address.MapToIPv4();
    var family = address.AddressFamily == AddressFamily.InterNetworkV6 ? "ipv6" : "ipv4";
    return Results.Ok(new ViewIp { Address = address.ToString(), Family = family });
  }

  static async Task<IResult> Page(HttpContext context, ReleaseFeed feed, CancellationToken ct)
  {
    var asked = context.Request.Query["lang"].ToString();
    var language = asked is "it" or "en" ? asked : context.Request.Headers.AcceptLanguage.ToString().StartsWith("it", StringComparison.OrdinalIgnoreCase) ? "it" : "en";
    var release = await feed.Latest(ct);
    context.Response.Headers.CacheControl = "no-cache";
    context.Response.Headers.ContentLanguage = language;
    context.Response.Headers.Vary = "Accept-Language";
    return Results.Content(DownloadPage.Render(release, language), "text/html; charset=utf-8");
  }

  static async Task<IResult> Download(string platform, ReleaseFeed feed, CancellationToken ct)
  {
    if (!ReleaseFeed.Platforms.Any(p => p.Platform == platform)) return Results.NotFound();
    var asset = ReleaseFeed.Asset(await feed.Latest(ct), platform);
    return asset?.Url is null ? Results.Redirect(Endpoints.Gitea.Releases) : Results.Redirect(asset.Url);
  }
}