using System.Text.Json;

namespace PrivaPub.Api.Mastodon.Infrastructure
{
	public static class MastodonErrors
	{
		public static IApplicationBuilder UseMastodonErrorBodies(this IApplicationBuilder app) =>
			app.UseWhen(context => context.Request.Path.StartsWithSegments("/api"), api => api.UseStatusCodePages(async pages =>
			{
				var response = pages.HttpContext.Response;
				response.ContentType = "application/json; charset=utf-8";
				await response.WriteAsync(JsonSerializer.Serialize(new { error = Message(response.StatusCode) }, MastodonJson.Options));
			}));

		public static string Message(int status) => status switch
		{
			StatusCodes.Status401Unauthorized => "The access token is invalid",
			StatusCodes.Status403Forbidden => "This action is outside the authorized scopes",
			StatusCodes.Status404NotFound => "Record not found",
			StatusCodes.Status405MethodNotAllowed => "Method not allowed",
			StatusCodes.Status413PayloadTooLarge => "Payload too large",
			StatusCodes.Status415UnsupportedMediaType => "Unsupported media type",
			StatusCodes.Status422UnprocessableEntity => "Validation failed",
			StatusCodes.Status429TooManyRequests => "Too many requests",
			>= 500 => "Something went wrong.",
			_ => "Bad request"
		};
	}
}