using Godot;
using System;

public partial class TAS_System : Node
{
    private double _frameLength = 0.1;
    private bool _isCountingFrames = false;
    private Timer _frameTimer;
    private int _currentFrame = 0;
    private int _lastAdvancedFrame = 0;

    public double FrameLength
    {
        get { return this._frameLength; }
        private set { this._frameLength = value; }
    }

    public bool IsCountingFrames
    {
        get { return this._isCountingFrames; }
        private set { this._isCountingFrames = value; }
    }

    private Timer FrameTimer
    {
        get { return this._frameTimer; }
        set { this._frameTimer = value; }
    }

    public int CurrentFrame
    {
        get { return this._currentFrame; }
        private set { this._currentFrame = value; }
    }

    /// <summary>
    /// The last frame that can be advanced to. This will
    /// only be greater than CurrentFrame after the player
    /// regresses frames, and will be equal to CurrentFrame
    /// when the player has just done an action.
    /// </summary>
    /// <value></value>
    public int LastAdvancedFrame
    {
        get { return this._lastAdvancedFrame; }
        private set { this._lastAdvancedFrame = value; }
    }


    [Signal]
    public delegate void FrameAdvancedEventHandler(int currentFrame);

    [Signal]
    public delegate void FramesAdvancedEventHandler(int numFrames);

    [Signal]
    public delegate void FramesRegressedEventHandler(int numFrames);


    public void StartCountingFrames()
    {

    }

    public void StopCountingFrames()
    {

    }

    public void ResetFrameCount()
    {
        this.CurrentFrame = 0;
        this.LastAdvancedFrame = 0;
    }

    // Returns how many frames it could successfully advance
    public int Advance(int numFrames)
    {
        int newFrame = Math.Min(this.CurrentFrame + numFrames, this.LastAdvancedFrame);
        int framesAdvanced = newFrame - this.CurrentFrame;
        EmitSignal(SignalName.FramesAdvanced, framesAdvanced);
        return framesAdvanced;
    }

    // Returns how many frames it could successfully regress
    public int Regress(int numFrames)
    {
        int newFrame = Math.Max(this.CurrentFrame - numFrames, 0);
        int framesRegressed = newFrame - this.CurrentFrame;
        EmitSignal(SignalName.FramesRegressed, framesRegressed);
        return framesRegressed;
    }

    /// <summary>
    /// Gets rid of advanced frames.
    /// </summary>
    public void DiscardAdvancedFrames()
    {
        this.LastAdvancedFrame = this.CurrentFrame;
    }



    // public void Test()
    // {
    //     GD.Print("test123");

    //     // EmitSignal(SignalName.TestSignal, "test456");
    // }
}