using Cocona;
class Program
{
    static void Main(string[] args)
    {
        // Cocona parses command-line and executes a command.
        CoconaApp.Run<Program>(args);
    }

    // public method as a command ™
    public void Hello(string name)
    {
        Console.WriteLine($"Hello {name}");
    }
}

// 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.
public void Hello(string name, bool hey) { ... }

// `--name "default user"` is specified implicity.
public void Hello(string name = "default user") { ... }

// 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
public void Remove([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" };
public void Compile([Option('I')]string[] include, [Argument]string file) { ... }

public void HasDescription([Option(Description = "Description of the option")] int value, [Argument(Description = "Description of the argument")]string arg) { ... }

// ./app alice karen
public void Hello([Argument]string from, [Argument]string to) { ... }

// ./copy file1 file2 file3 dest
public void Copy([Argument]string[] src, [Argument]string dest) { ... }

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

[Command(Description = "Say hello")]
public void Hello([Argument]string name)
{
    Console.WriteLine($"Hello {name}!");
}

[Command(Description = "Say goodbye")]
public void Bye([Argument]string name)
{
    Console.WriteLine($"Goodbye {name}!");
}

[HasSubCommands(typeof(Server), Description = "Server commands")]
[HasSubCommands(typeof(Client), Description = "Client commands")]
class Program
{
    static void Main(string[] args) => CoconaApp.Run<Program>(args);

    // ./myapp info
    public void Info() => Console.WriteLine("Show information");
}

// ./myapp server [command]
class Server
{
    public void Start() => Console.WriteLine("Start");
    public void Stop() => Console.WriteLine("Stop");
}

// ./myapp client [command]
class Client
{
    public void Connect() => Console.WriteLine("Connect");
    public void Disconnect() => Console.WriteLine("Disconnect");
}

[PrimaryCommand]
public void Primary(bool foo, string bar) { ... }

[Command]
public void Hello() { ... }

[Command]
public void Goodbye() { ... }

[OptionLikeCommand("hello", new[] {'f'}, typeof(Program), nameof(Hello))]
public void Execute()
    => Console.WriteLine("Execute");

private void Hello([Argument]string name)
    => Console.WriteLine($"Hello {name}!");

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.");
    }
}

class Program : CoconaConsoleAppBase
{
    ...
    public async Task RunAsync()
    {
        while (!Context.CancellationToken.IsCancellationRequested)
        {
            await Task.Delay(100);
        }
    }
}

public async Task RunAsync([FromService]ICoconaAppContextAccessor contextAccessor)
{
    var ctx = contextAccessor.Current ?? throw new InvalidOperationException();
    while (!ctx.CancellationToken.IsCancellationRequested)
    {
        await Task.Delay(100);
    }
}

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

    [SampleCommandFilter]
    public void Hello()
    {
        Console.WriteLine($"Hello Konnichiwa");
    }
}

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}");
        }
    }
}

class Program
{
    public Program(ILogger<Program> logger)
    {
        logger.LogInformation("Create Instance");
    }

    static void Main(string[] args)
    {
        CoconaApp.Create()
            .ConfigureServices(services =>
            {
                services.AddTransient<MyService>();
            })
            .Run<Program>(args);
    }

    public void Hello([FromService]MyService myService)
    {
        myService.Hello("Hello Konnichiwa!");
    }
}

class MyService
{
    private readonly ILogger _logger;

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

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

class Program : CoconaConsoleAppBase
{
    static void Main(string[] args)
    {
        CoconaApp.Create()
            .ConfigureLogging(logging =>
            {
                logging.AddDebug();
            })
            .Run<Program>(args);
    }

    public async Task RunAsync()
    {
        Context.Logger.LogInformation("Hello Konnichiwa!");
    }
}

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

[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()
            .UseCocona(args, new[] { typeof(Program) })
            .Build()
            .RunAsync();
    }

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