// ***********************************************************************
// <copyright file="HttpErrorMiddleware.cs">
//     AgileWebs
// </copyright>
// ***********************************************************************

using Microsoft.AspNetCore.Http;
using Serilog;
using System.Text.Json;

namespace Core.Blueprint.Logging
{
    /// <summary>
    /// Handles HTTP logging.
    /// </summary>
    public class HttpErrorMiddleware
    {
        private readonly ILogger logger;
        private readonly RequestDelegate requestProcess;
        public readonly ServiceSettings settings;

        /// <summary>
        /// Creates a new instrance of <see cref="HttpErrorMiddleware"/>.
        /// </summary>
        /// <param name="logger">The logger representig an instance of <see cref="ILogger"/>.</param>
        /// <param name="requestProcess">The request delegate process.</param>
        public HttpErrorMiddleware(ILogger logger, RequestDelegate requestProcess, ServiceSettings settings)
        {
            this.logger = logger;
            this.requestProcess = requestProcess;
            this.settings = settings;
        }

        /// <summary>
        /// Invoke method.
        /// </summary>
        /// <param name="context">The HTTP context.</param>
        /// <returns>A <see cref="Task"/> representing the asynchronous operation.</returns>
        public async Task Invoke(HttpContext context)
        {
            try
            {
                await requestProcess(context).ConfigureAwait(false);
            }
            catch (HttpException exception)
            {
                await HandleErrorResponse(
                    context,
                    exception.Message,
                    exception.ErrorCode,
                    exception.StatusCode).ConfigureAwait(false);
            }
            catch (Exception defaultException)
            {
                await HandleErrorResponse(
                    context,
                    defaultException.Message,
                    ErrorCodes.InternalServerError,
                    StatusCodes.Status500InternalServerError).ConfigureAwait(false);
            }
        }

        /// <summary>
        /// Handles error responses.
        /// </summary>
        /// <param name="context">The HTTP context.</param>
        /// <param name="message">The error message.</param>
        /// <param name="errorCode">The error code.</param>
        /// <param name="statusCode">The HTTP status code.</param>
        /// <returns>A <see cref="Task"/> representing the asynchronous operation.</returns>
        private async Task HandleErrorResponse(HttpContext context, string? message, string? errorCode, int statusCode)
        {
            var errorMessage = new HttpError(
                message,
                errorCode,
                string.Format(
                    Responses.Target,
                    context.Request.Method,
                    context.Request.Scheme,
                    context.Request.Host.Host,
                    context.Request.Path));

            logger.LogError<HttpError>(context, errorMessage, $"{settings.ApplicationName}-{settings.LayerName}");

            context.Response.ContentType = MimeTypes.ApplicationJson;
            context.Response.StatusCode = statusCode;

            await context.Response.WriteAsync(JsonSerializer.Serialize(errorMessage)).ConfigureAwait(false);
        }
    }
}