using Godot;
using System;
using System.Threading.Tasks;

public class AwaitTest : WAT.Test
{
    [Signal] public delegate void MySignal();

    public event EventHandler MyEventHandlerEvent;
    public event EventHandler MyEventHandlerEventWithArgs;

    public event Action MyActionEvent;
    public event Action<string, int> MyActionEventWithArgs;

    // In Addition to the Tests below, Developers may also await..
    // ..any method that is targeted by the the [Start], [Pre]..
    // ..[Post], [End] attributes provided they change the..
    // ..targeted method's signature to async task.

    [Test]
    public async Task AwaitUntilTimeout()
    {
        // Developers may await in tests for a set of amount of..
        // ..time by changing the Test Method signature to..
        // ..async Task while calling await UntilTimeout.
        await UntilTimeout(0.2f);
        Assert.AutoPass("Await Until Timeout");
    }

    [Test]
    public async Task AwaitUntilSignal()
    {
        // Developers may await in tests for a signal by..
        // ..changing the Test Method signature to async task..
        // ..and awaiting UntilSignal passing in the emitter..
        // ..object, the string signal and the time limit.
        CallDeferred("emit_signal", nameof(MySignal));
        await UntilSignal(this, nameof(MySignal), 0.2f);
        Assert.AutoPass("Await Until Signal");
    }

    [Test]
    public async Task AwaitUntilEvent()
    {
        // Developers may await in tests for an Event with no EventArgs..
        // ..by changing the Test Method signature to async task and..
        // ..awaiting UntilEvent passing in the Event sender, the event..
        // ..handle and a time limit.
        // Note: Currently WAT only handles Event handles that take the..
        // ..the sender and an optional EventArg object.
        CallDeferred(nameof(InvokeEventHandlerEventWithNoArgs));
        await UntilEvent(this, nameof(MyEventHandlerEvent), 0.2f);
        Assert.AutoPass("Await Until Event");
    }

    [Test]
    public async Task AwaitUntilEventHandlerEventWithArgs()
    {
        // Developers may await in tests for an Event with EventArgs..
        // ..by changing the Test Method signature to async task and..
        // ..awaiting UntilEvent passing in the Event sender, the event..
        // ..handle and a time limit.
        // Note: Currently WAT only handles Event handles that take the..
        // ..the sender and an optional EventArg Object.
        CallDeferred(nameof(InvokeEventHandlerEventWithEventArgs), "Hello", "Alex");

        // Developers may investigate TestEventData object returned by UntilEvent..
        // ..which containers the property Sender and the property Arguments which..
        // ..stores the EventArg object that may have been sent.
        TestEventData data =
            await UntilEventHandlerEvent(this, nameof(MyEventHandlerEventWithArgs), 0.2f);
        GreetingArgs args = (GreetingArgs)data.Arguments;
        Assert.IsEqual(args.Greeting, "Hello");
        Assert.IsEqual(args.Name, "Alex");
    }

    [Test]
    public async Task AwaitUntilEventWithArgs()
    {
        // Developers may await in tests for an Event with any parameters.
        CallDeferred(nameof(InvokeActionEventWithArgs), "heyo", 20);

        // Developers may investigate the parameters invoked by the event.
        // These parameters are returned from UntilEvent.
        var args = await UntilEvent(this, nameof(MyActionEventWithArgs), 10, (string text, int number) =>
        {
            // Developers may also use a callback method to
            // directly link themselves up to the event.
            Assert.IsEqual(text, "heyo");
            Assert.IsEqual(number, 20);
        });

        Assert.IsEqual(args[0], "heyo");
        Assert.IsEqual(args[1], 20);
    }

    private void InvokeActionEventWithNoArgs()
    {
        MyActionEvent?.Invoke();
    }

    private void InvokeActionEventWithArgs(string text, int number)
    {
        MyActionEventWithArgs?.Invoke(text, number);
    }

    private void InvokeEventHandlerEventWithNoArgs()
    {
        MyEventHandlerEvent?.Invoke(this, null);
    }

    private void InvokeEventHandlerEventWithEventArgs(string greeting, string name)
    {
        MyEventHandlerEventWithArgs?.Invoke(this, new GreetingArgs(greeting, name));
    }

    public class GreetingArgs : EventArgs
    {
        public string Greeting { get; set; }
        public string Name { get; set; }

        public GreetingArgs(string greeting, string name)
        {
            Greeting = greeting;
            Name = name;
        }

    }
}