// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using System.CommandLine;
using System.Diagnostics;
using System.Text;
using Aspire.Cli.Backchannel;
using Aspire.Cli.Certificates;
using Aspire.Cli.Commands;
using Aspire.Cli.Interaction;
using Aspire.Cli.Projects;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using Spectre.Console;
using Microsoft.Extensions.Configuration;
 
#if DEBUG
using OpenTelemetry;
using OpenTelemetry.Resources;
using OpenTelemetry.Trace;
#endif
 
using RootCommand = Aspire.Cli.Commands.RootCommand;
 
namespace Aspire.Cli;
 
public class Program
{
    private static readonly ActivitySource s_activitySource = new ActivitySource(nameof(Program));
 
    /// <summary>
    /// This method walks up the directory tree looking for the .aspire/settings.json files
    /// and then adds them to the host as a configuration source. This means that the settings
    /// architecture for the CLI will just be standard .NET configuraiton.
    /// </summary>
    private static void SetupAppHostOptions(HostApplicationBuilder builder)
    {
        var settingsFiles = new List<FileInfo>();
        var currentDirectory = new DirectoryInfo(Directory.GetCurrentDirectory());
 
        while (true)
        {
            var settingsFilePath = Path.Combine(currentDirectory.FullName, ".aspire", "settings.json");
 
            if (File.Exists(settingsFilePath))
            {
                var settingsFile = new FileInfo(settingsFilePath);
                settingsFiles.Add(settingsFile);
            }
 
            if (currentDirectory.Parent is null)
            {
                break;
            }
 
            currentDirectory = currentDirectory.Parent;
        }
 
        settingsFiles.Reverse();
        foreach (var settingsFile in settingsFiles)
        {
            builder.Configuration.AddJsonFile(settingsFile.FullName);
        }
    }
 
    private static IHost BuildApplication(string[] args)
    {
        var builder = Host.CreateApplicationBuilder();
        SetupAppHostOptions(builder);
 
        builder.Logging.ClearProviders();
 
        // Always configure OpenTelemetry.
        builder.Logging.AddOpenTelemetry(logging => {
            logging.IncludeFormattedMessage = true;
            logging.IncludeScopes = true;
            });
 
#if DEBUG
        var otelBuilder = builder.Services
            .AddOpenTelemetry()
            .WithTracing(tracing => {
                tracing.AddSource(
                    nameof(NuGetPackageCache),
                    nameof(AppHostBackchannel),
                    nameof(DotNetCliRunner),
                    nameof(Program),
                    nameof(NewCommand),
                    nameof(RunCommand),
                    nameof(AddCommand),
                    nameof(PublishCommand)
                    );
 
                tracing.SetResourceBuilder(ResourceBuilder.CreateDefault().AddService("aspire-cli"));
            });
 
        if (builder.Configuration["OTEL_EXPORTER_OTLP_ENDPOINT"] is {})
        {
            // NOTE: If we always enable the OTEL exporter it dramatically
            //       impacts the CLI in terms of exiting quickly because it
            //       has to finish sending telemetry.
            otelBuilder.UseOtlpExporter();
        }
#endif
 
        var debugMode = args?.Any(a => a == "--debug" || a == "-d") ?? false;
 
        if (debugMode)
        {
            builder.Logging.AddFilter("Aspire.Cli", LogLevel.Debug);
            builder.Logging.AddConsole();
        }
 
        // Shared services.
        builder.Services.AddSingleton(BuildAnsiConsole);
        builder.Services.AddSingleton(BuildProjectLocator);
        builder.Services.AddSingleton<INewCommandPrompter, NewCommandPrompter>();
        builder.Services.AddSingleton<IAddCommandPrompter, AddCommandPrompter>();
        builder.Services.AddSingleton<IPublishCommandPrompter, PublishCommandPrompter>();
        builder.Services.AddSingleton<IInteractionService, InteractionService>();
        builder.Services.AddSingleton<ICertificateService, CertificateService>();
        builder.Services.AddTransient<IDotNetCliRunner, DotNetCliRunner>();
        builder.Services.AddTransient<IAppHostBackchannel, AppHostBackchannel>();
        builder.Services.AddSingleton<CliRpcTarget>();
        builder.Services.AddTransient<INuGetPackageCache, NuGetPackageCache>();
 
        // Commands.
        builder.Services.AddTransient<NewCommand>();
        builder.Services.AddTransient<RunCommand>();
        builder.Services.AddTransient<AddCommand>();
        builder.Services.AddTransient<PublishCommand>();
        builder.Services.AddTransient<RootCommand>();
 
        var app = builder.Build();
        return app;
    }
 
    private static IAnsiConsole BuildAnsiConsole(IServiceProvider serviceProvider)
    {
        AnsiConsoleSettings settings = new AnsiConsoleSettings()
        {
            Ansi = AnsiSupport.Detect,
            Interactive = InteractionSupport.Detect,
            ColorSystem = ColorSystemSupport.Detect
        };
        var ansiConsole = AnsiConsole.Create(settings);
        return ansiConsole;
    }
 
    private static IProjectLocator BuildProjectLocator(IServiceProvider serviceProvider)
    {
        var logger = serviceProvider.GetRequiredService<ILogger<ProjectLocator>>();
        var runner = serviceProvider.GetRequiredService<IDotNetCliRunner>();
        return new ProjectLocator(logger, runner, new DirectoryInfo(Directory.GetCurrentDirectory()));
    }
 
    public static async Task<int> Main(string[] args)
    {
        System.Console.OutputEncoding = Encoding.UTF8;
 
        using var app = BuildApplication(args);
 
        await app.StartAsync().ConfigureAwait(false);
 
        var rootCommand = app.Services.GetRequiredService<RootCommand>();
        var config = new CommandLineConfiguration(rootCommand);
        config.EnableDefaultExceptionHandler = true;
        
        using var activity = s_activitySource.StartActivity();
        var exitCode = await config.InvokeAsync(args);
 
        await app.StopAsync().ConfigureAwait(false);
 
        return exitCode;
    }
}