// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using System;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Http.Extensions;
using Microsoft.AspNetCore.HttpOverrides;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;

namespace SampleApp
{
    public class Startup
    {
        public void ConfigureServices(IServiceCollection services)
        {

        }

        public void Configure(IApplicationBuilder app, IConfiguration config)
        {
            app.Run(async (context) =>
            {
                await context.Response.WriteAsync($"Hello from {context.Request.GetDisplayUrl()}\r\n");
                await context.Response.WriteAsync("\r\n");

                await context.Response.WriteAsync("Headers:\r\n");
                foreach (var header in context.Request.Headers)
                {
                    await context.Response.WriteAsync($"{header.Key}: {header.Value}\r\n");
                }
                await context.Response.WriteAsync("\r\n");

                await context.Response.WriteAsync("Connection:\r\n");
                await context.Response.WriteAsync("RemoteIp: " + context.Connection.RemoteIpAddress + "\r\n");
                await context.Response.WriteAsync("RemotePort: " + context.Connection.RemotePort + "\r\n");
                await context.Response.WriteAsync("LocalIp: " + context.Connection.LocalIpAddress + "\r\n");
                await context.Response.WriteAsync("LocalPort: " + context.Connection.LocalPort + "\r\n");
                await context.Response.WriteAsync("ClientCert: " + context.Connection.ClientCertificate + "\r\n");
                await context.Response.WriteAsync("\r\n");

                await context.Response.WriteAsync("Environment Variables:\r\n");
                var vars = Environment.GetEnvironmentVariables();
                foreach (var key in vars.Keys.Cast<string>().OrderBy(key => key, StringComparer.OrdinalIgnoreCase))
                {
                    var value = vars[key];
                    await context.Response.WriteAsync($"{key}: {value}\r\n");
                }
                await context.Response.WriteAsync("\r\n");

                await context.Response.WriteAsync("Config:\r\n");
                await ShowConfig(context.Response, config);
                await context.Response.WriteAsync("\r\n");
            });
        }

        private static async Task ShowConfig(HttpResponse response, IConfiguration config)
        {
            foreach (var pair in config.GetChildren())
            {
                await response.WriteAsync($"{pair.Path}: {pair.Value}\r\n");
                await ShowConfig(response, pair);
            }
        }
    }
}
