package fr.cyu.td7;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;

public class MySurfaceView extends SurfaceView implements Runnable, View.OnTouchListener {
    private Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
    private Thread thread = null;
    private SurfaceHolder sh;
    private boolean paused = true;

    private boolean dragging;
    private int x;
    private int y;

    public MySurfaceView(Context context, AttributeSet attrSet) {
        super(context, attrSet);
        sh = getHolder();
        setOnTouchListener(this);
        x = getWidth() / 2;
        y = getHeight() / 2;
    }

    @Override
    public boolean onTouch(View v, MotionEvent event) {
        int x = (int) event.getX(); // pixel coordinates
        int y = (int) event.getY();
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                int size = getWidth() / 4;
                boolean inX = x >= this.x - size && x <= this.x + size;
                boolean inY = y >= this.y - size && y <= this.y + size;
                Log.i("fr.cyu.td7", "Down: x=" + x + ", y=" + y + ", maxX=" + (this.x + getWidth() / 4) + ", maxY=" + (this.y + getWidth() / 4) + ", this.x=" + this.x + ", this.y=" + this.y + ", inX=" + inX + ", inY=" + inY);
                if (inX && inY) dragging = true;
                break;
            case MotionEvent.ACTION_UP:
                dragging = false;
                break;
            case MotionEvent.ACTION_MOVE:
                if(dragging) {
                    this.x = x;
                    this.y = y;
                }
                break;
        }
        return true; // the event has been consumed
    }


    public void resume() { // to call in Activity.onResume
        paused = false;
        thread = new Thread(this);
        thread.start();
    }

    public void pause() {// to call in Activity.onPause
        paused = true;
        while (true) {
            try {
                thread.join();
                break;
            } catch (InterruptedException e) {
                Log.e("fr.cyu.td7", "Error when pausing", e);
            }
        }
        thread = null;
    }

    public void run() {
        while (!paused) {
            if (!sh.getSurface().isValid()) continue;
            Canvas canvas = sh.lockCanvas();
            paint.setStyle(Paint.Style.FILL);
            paint.setAntiAlias(true);
            paint.setColor(Color.GREEN);
            canvas.drawPaint(paint);

            paint.setColor(Color.WHITE);
            int size = dragging ? getWidth() / 5 : getWidth() / 4;
            canvas.drawCircle(x, y, size, paint);
            sh.unlockCanvasAndPost(canvas);
        }
    }
}