using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Hosting;
using Serilog;
using Serilog.Exceptions;
using Serilog.Exceptions.Core;
using Serilog.Exceptions.EntityFrameworkCore.Destructurers;
using Serilog.Sinks.Elasticsearch;
using System;
using System.Reflection;

namespace My.ProjectName
{
    public class Program
    {
        public static void Main(string[] args)
        {
            // Configure logging first
            ConfigureLogging();

            // Then create the host, so that if the host fails we can log errors
            CreateHost(args);
        }

        public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
                .ConfigureWebHostDefaults(webBuilder =>
                {
                    webBuilder.UseStartup<Startup>();
                })
                .ConfigureAppConfiguration(configuration =>
                {
                    configuration.AddJsonFile("appsettings.json", optional: false, reloadOnChange: true);
                    configuration.AddJsonFile(
                        $"appsettings.{Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT")}.json",
                        optional: true);
                })
                .UseSerilog();

        private static void CreateHost(string[] args)
        {
            try
            {
                CreateHostBuilder(args).Build().Run();
            }
            catch (System.Exception ex)
            {
                Log.Fatal($"Failed to start {Assembly.GetExecutingAssembly().GetName().Name}", ex);
                throw;
            }
        }

        private static void ConfigureLogging()
        {
            var environment = Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT");
            var configuration = new ConfigurationBuilder()
                .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
                .AddJsonFile(
                    $"appsettings.{Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT")}.json",
                    optional: true)
                .Build();

            Log.Logger = new LoggerConfiguration()
                .Enrich.FromLogContext()
                .Enrich.WithExceptionDetails(new DestructuringOptionsBuilder()
                    .WithDefaultDestructurers()
                    .WithDestructurers(new[] { new DbUpdateExceptionDestructurer() }))
                .Enrich.WithMachineName()
                .WriteTo.Debug()
                .WriteTo.Console()
                .WriteTo.File("logs/log-.log", rollingInterval: RollingInterval.Day, shared: true, retainedFileCountLimit: 7)
                .WriteTo.Elasticsearch(ConfigureElasticSink(configuration, environment))
                .Enrich.WithProperty("Environment", environment)
                .ReadFrom.Configuration(configuration)
                .CreateLogger();
        }

        private static ElasticsearchSinkOptions ConfigureElasticSink(IConfigurationRoot configuration, string environment)
        {
            return new ElasticsearchSinkOptions(new Uri(configuration["ElasticConfiguration:Uri"]))
            {
                AutoRegisterTemplate = true,
                IndexFormat = $"{Assembly.GetExecutingAssembly().GetName().Name.ToLower().Replace(".", "-")}-{environment?.ToLower().Replace(".", "-")}-{DateTime.UtcNow:yyyy-MM}"
            };
        }
    }
}