using System.Diagnostics.CodeAnalysis;
using Foxchat.Core.Federation;
using Microsoft.AspNetCore.Http;

namespace Foxchat.Core.Extensions;

public static class HttpContextExtensions
{
    public static bool ExtractRequestData(this HttpContext ctx, [NotNullWhen(true)] out string? signature,
        [NotNullWhen(true)] out string? domain, [NotNullWhen(true)] out SignatureData? data)
    {
        signature = null;
        domain = null;
        data = null;

        if (!ctx.Request.Headers.TryGetValue(RequestSigningService.SIGNATURE_HEADER, out var encodedSignature))
            return false;
        if (!ctx.Request.Headers.TryGetValue(RequestSigningService.DATE_HEADER, out var date))
            return false;
        if (!ctx.Request.Headers.TryGetValue(RequestSigningService.SERVER_HEADER, out var server))
            return false;
        var time = RequestSigningService.ParseTime(date.ToString());
        string? userId = null;
        if (ctx.Request.Headers.TryGetValue(RequestSigningService.USER_HEADER, out var userIdHeader))
            userId = userIdHeader;
        var host = ctx.Request.Headers.Host.ToString();

        signature = encodedSignature.ToString();
        domain = server.ToString();
        data = new SignatureData(
            time,
            host,
            ctx.Request.Path,
            (int?)ctx.Request.Headers.ContentLength,
            userId
        );

        return true;
    }
}