using System.Net.Mime;
using System.Text.Json;

namespace BlackRock.Reporting.API.Exceptions
{
    public class ApplicationExceptionMiddleware
    {
        private readonly RequestDelegate next;
        private readonly IExceptionHandler exceptionHandler;
        private readonly ILogger<ApplicationExceptionMiddleware> logger;

        public ApplicationExceptionMiddleware(RequestDelegate next,IExceptionHandler exceptionHandler,ILogger<ApplicationExceptionMiddleware> logger)
        {
            this.next = next;
            this.exceptionHandler = exceptionHandler;
            this.logger = logger;
        }

        public async Task InvokeAsync(HttpContext httpContext)
        {
            try
            {
                await next(httpContext);
            }
            catch (Exception ex)
            {
                var error = exceptionHandler.HandleException(ex);
                if(!httpContext.Response.HasStarted)
                {
                    httpContext.Response.Clear();
                    httpContext.Response.ContentType = MediaTypeNames.Application.Json;
                    httpContext.Response.StatusCode = (int)error.StatusCode;
                    await httpContext.Response.WriteAsync(JsonSerializer.Serialize(error));
                }
            }
        }
    }
}