CoconaApp.Run((string? name, bool hey) =>
    Console.WriteLine($"{(hey ? "Hey" :"Hello")} {(name ?? "Guest")}!"));

using Cocona;
CoconaApp.Run((string name) =>
{
    Console.WriteLine($"Hello {name}");
})

CoconaApp.Run((string name, int age) => { ... });

var builder = CoconaApp.CreateBuilder();
var app = builder.Build();

app.AddCommand((string name, int age) => { ... });

app.Run();

var app = CoconaApp.Create(); // is a shorthand for `CoconaApp.CreateBuilder().Build()`

app.AddCommand("list", () => { ... });
app.AddCommand("add", () => { ... });
app.AddCommand("delete", () => { ... });

app.Run();

app.AddCommands<MyCommand>();

// Treats a method name as a command name. (Below method is named `command`)
public void Command() { ... }

// Specify a command name using CommandAttribute.
[Command("commandname")]
public void Command() { ... }

// Cocona will ignore this method.
[Ignore]
public void Ignored() { ... }

CoconaApp.Run<Program>(args, options =>
{
    // If the option value is `false`, All command methods require `CommandAttribute`.
    options.TreatPublicMethodsAsCommands = false;
});

// This command accepts `--name <string>` and `--hey` options.
app.AddCommand((string name, bool hey) => { ... });

// `--name` is non-mandatory option.
// If the user runs the application without this option, the parameter will be `null`.
app.AddCommand((string? name) => { ... });

// The command accepts `-f` or `--force` option.
// Cocona's command-line parser accepts getopt-like styles. See below.
// $ remove --force --recursive
// $ remove -r -f
// $ remove -rf
app.AddCommand(([Option('f')]bool force, [Option('r')]bool recursive) => { ... });

// $ compile -I../path/to/foo.h -I/usr/include/bar.h -I/usr/include/baz.h nantoka.c
// include = new [] { "../path/to/foo.h", "/usr/include/bar.h", "/usr/include/baz.h" };
app.AddCommand(([Option('I')]string[] include, [Argument]string file) => { ... });

app.AddCommand((
    [Option(Description = "Description of the option")] int value,
    [Argument(Description = "Description of the argument")]string arg
) => { ... });

// ./app alice karen
app.AddCommand(([Argument]string from, [Argument]string to) => { ... });

// ./copy file1 file2 file3 dest
app.AddCommand(([Argument]string[] src, [Argument]string dest) => { ... });

var app = CoconaApp.Create();
app.AddCommand("hello", ([Argument]string name) => Console.WriteLine($"Hello {name}!"))
    .WithDescription("Say hello");
app.AddCommand("bye", ([Argument]string name) => Console.WriteLine($"Goodbye {name}!"))
    .WithDescription("Say goodbye");
app.Run();

var app = CoconaApp.Create();
// ./myapp info
app.AddCommand("info", () => Console.WriteLine("Show information"));

// ./myapp server [command]
app.AddSubCommand("server", x =>
{
    x.AddCommand("start", () => Console.WriteLine("Start"));
    x.AddCommand("stop", () => Console.WriteLine("Stop"));
})
.WithDescription("Server commands");

// ./myapp client [command]
app.AddSubCommand("client", x =>
{
    x.AddCommand("connect", () => Console.WriteLine("Connect"));
    x.AddCommand("disconnect", () => Console.WriteLine("Disconnect"));
})
.WithDescription("Client commands");

app.Run();

var app = CoconaApp.Create();
app.AddCommand((bool foo, string bar) => { ... }); // Primary command

app.AddCommand("hello", () => { ... });
app.AddCommand("goodbye", () => { ... });
app.Run();

var app = CoconaApp.Create();
app.AddCommand(() => Console.WriteLine("Execute"))
    .OptionLikeCommand(x =>
    {
        x.AddCommand("hello", ([Argument]string name) => Console.WriteLine($"Hello {name}!"))
            .WithAliases('f');
    });
app.Run();

public record CommonParameters(
    [Option('t', Description = "Specifies the remote host to connect.")]
    string Host,
    [Option('p', Description = "Port to connect to on the remote host.")]
    int Port,
    [Option('u', Description = "Specifies the user to log in as on the remote host.")]
    string User = "root",
    [Option('f', Description = "Perform without user confirmation.")]
    bool Force = false
) : ICommandParameterSet;

public void Add(CommonParameters commonParams, [Argument] string from, [Argument] string to)
    => Console.WriteLine($"Add: {commonParams.User}@{commonParams.Host}:{commonParams.Port} {(commonParams.Force ? " (Force)" : "")}");

public void Update(CommonParameters commonParams, [Option('r', Description = "Traverse recursively to perform.")] bool recursive, [Argument] string path)
    => Console.WriteLine($"Update: {commonParams.User}@{commonParams.Host}:{commonParams.Port} {(commonParams.Force ? " (Force)" : "")}");

public class CommonParameters : ICommandParameterSet
{
    [Option('t', Description = "Specifies the remote host to connect.")]
    public string Host { get; set; }

    [Option('p', Description = "Port to connect to on the remote host.")]
    public int Port { get; set; }

    [Option('u', Description = "Specifies the user to log in as on the remote host.")]
    [HasDefaultValue]
    public string User  { get; set; } = "root";

    [Option('f', Description = "Perform without user confirmation.")]
    public bool Force  { get; set; } = false;
}

public void Add(CommonParameters commonParams, [Argument] string from, [Argument] string to)
    => Console.WriteLine($"Add: {commonParams.User}@{commonParams.Host}:{commonParams.Port} {(commonParams.Force ? " (Force)" : "")}");

public void Update(CommonParameters commonParams, [Option('r', Description = "Traverse recursively to perform.")] bool recursive, [Argument] string path)
    => Console.WriteLine($"Update: {commonParams.User}@{commonParams.Host}:{commonParams.Port} {(commonParams.Force ? " (Force)" : "")}");

// Exit Code: 0
public void NoReturn() { }

// Exit Code: 123
public int Return() { return 123; }

// Exit Code: 255
public async Task<int> ReturnAsync() { return 255; }

// Exit Code: -1
public async ValueTask<int> ReturnValueTaskAsync() { return -1; }

// Exit Code: 128
public void Throw() { throw new CommandExitedException(128); }

class Program
{
    static void Main(string[] args)
    {
        CoconaApp.Run<Program>(args);
    }

    public void Run([Range(1, 128)]int width, [Range(1, 128)]int height, [Argument][PathExists]string filePath)
    {
        Console.WriteLine($"Size: {width}x{height}");
        Console.WriteLine($"Path: {filePath}");
    }
}

class PathExistsAttribute : ValidationAttribute
{
    protected override ValidationResult IsValid(object value, ValidationContext validationContext)
    {
        if (value is string path && (Directory.Exists(path) || Directory.Exists(path)))
        {
            return ValidationResult.Success;
        }
        return new ValidationResult($"The path '{value}' is not found.");
    }
}

app.AddCommand(async (CoconaAppContext ctx) =>
{
    while (!ctx.CancellationToken.IsCancellationRequested)
    {
        await Task.Delay(100);
    }
});

var app = CoconaApp.Create();

// Add a command with command filters.
app.AddCommand(() =>
    {
        Console.WriteLine($"Hello Konnichiwa");
    })
    .WithFilter(new SampleCommandFilter())
    .WithFilter(async (ctx, next) =>
    {
        // You can declare and apply a filter using a delegate.
        return await next(ctx);
    });

// Add a command filter and apply it to commands after this call.
app.UseFilter(new MyFilter());

class SampleCommandFilterAttribute : CommandFilterAttribute
{
    public override async ValueTask<int> OnCommandExecutionAsync(CoconaCommandExecutingContext ctx, CommandExecutionDelegate next)
    {
        Console.WriteLine($"Before Command: {ctx.Command.Name}");
        try
        {
            return await next(ctx);
        }
        finally
        {
            Console.WriteLine($"End Command: {ctx.Command.Name}");
        }
    }
}

var builder = CoconaApp.CreateBuilder();
builder.Services.AddTransient<MyService>();

var app = builder.Build();
app.AddCommand((MyService myService) =>
{
    myService.Hello("Hello Konnichiwa!");
});
app.Run();

class MyService
{
    private readonly ILogger _logger;

    public MyService(ILogger<MyService> logger)
    {
        _logger = logger;
    }

    public void Hello(string message)
    {
        _logger.LogInformation(message);
    }
}

var builder = CoconaApp.CreateBuilder();
builder.Logging.AddDebug();

app.AddCommand((ILogger<Program> logger) => logger.LogInformation("Hello Konnichiwa!")));

var app = builder.Build();
app.Run();

CoconaLiteApp.Run(() => { ... });

var app = CoconaLiteApp.Create();
app.AddCommand(() => { ... });
app.Run();

static void Main(string[] args)
{
    CoconaLiteApp.Run<Program>(args);
}

// Register Microsoft.Extensions.Localization and ICoconaLocalizer services
// Cocona uses `ICoconaLocalizer` to localize command descriptions.
var builder = CoconaApp.CreateBuilder();
builder.Services.AddLocalization(options =>
{
    options.ResourcesPath = "Resources";
});

// `MicrosoftExtensionLocalizationCoconaLocalizer` is not included in Cocona core library.
builder.Services.TryAddTransient<ICoconaLocalizer, MicrosoftExtensionLocalizationCoconaLocalizer>();

var app = builder.Build();
app.AddCommand("hello", ([Argument(Description = "Name")]string name, IStringLocalizer<Program> localizer) =>
    {
        // Get a localized text from Microsoft.Extensions.Localization.IStringLocalizer (same as ASP.NET Core)
        Console.WriteLine(localizer.GetString("Hello {0}!", name));
    })
    .WithDescription("Say Hello");
app.Run();

var app = CoconaApp.Create();
app.AddCommand("hello", (string name) =>
    {
        Console.WriteLine("Hello {0}!", name);
    });
app.AddCommand("secret-command", (string name) =>
    {
        Console.WriteLine("🙊");
    })
    .WithMetadata(new HiddenAttribute());
app.Run();

[CommandMethodForwardedTo(typeof(BuiltInOptionLikeCommands), nameof(BuiltInOptionLikeCommands.ShowHelp))]
public void MyHelp()
    => throw new NotSupportedException(); // NOTE: The method body and parameters used is BuiltInOptionLikeCommands.ShowHelp.

class Program
{
    static async Task Main(string[] args)
    {
        await Host.CreateDefaultBuilder()
            .ConfigureCocona(args, new[] { typeof(Program) })
            .Build()
            .RunAsync();
    }

    public void Hello()
    {
        Console.WriteLine($"Hello Konnichiwa!");
    }
}