using System.Text.Json;
using FinalFactory.Rendezvous.Contracts;
using Microsoft.AspNetCore.Diagnostics;

namespace FinalFactory.Rendezvous.Server.Http;

internal sealed class RendezvousExceptionHandler : IExceptionHandler
{
    public async ValueTask<bool> TryHandleAsync(
        HttpContext httpContext,
        Exception exception,
        CancellationToken cancellationToken)
    {
        if (httpContext.Response.HasStarted)
        {
            return false;
        }

        bool invalidRequest = exception is BadHttpRequestException or JsonException;
        httpContext.Response.StatusCode = invalidRequest
            ? StatusCodes.Status400BadRequest
            : StatusCodes.Status500InternalServerError;
        await httpContext.Response.WriteAsJsonAsync(
            new ApiError
            {
                Code = invalidRequest
                    ? RendezvousErrorCode.InvalidRequest
                    : RendezvousErrorCode.InternalError,
                Message = invalidRequest
                    ? "The request body, route, or query value is invalid."
                    : "The service could not complete the request.",
            },
            ContractJson.Options,
            cancellationToken).ConfigureAwait(false);
        return true;
    }
}