package eVVM.apk.helper;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.ScaleGestureDetector;
import android.widget.FrameLayout;

public class CommunityView extends FrameLayout {

	public Matrix						matrix;																	// 缩放矩阵
	private int							lastX;
	private int							lastY;
	private int							downX;
	private int							downY;
	private boolean						isScale;																// true:正在缩放
	private boolean						pointer;															// 是否多个手指
	private int count = 0;//点击次数
	private long firstClick = 0;//第一次点击时间
	private long secondClick = 0;//第二次点击时间

	private float scale = 1.0f;
	private final float maxScale = 3.0f;
	private final float minScale = 1.0f;
	/**
	 * 两次点击时间间隔，单位毫秒
	 */
	private final int totalTime = 300;

	public CommunityView(@NonNull Context context) {
		this(context, null);
	}

	public CommunityView(@NonNull Context context, @Nullable AttributeSet attrs) {
		this(context, attrs, 0);
	}

	public CommunityView(@NonNull final Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
		super(context, attrs, defStyleAttr);
		matrix = new Matrix();
	}

	@Override protected void onDraw(Canvas canvas) {
		super.onDraw(canvas);
		canvas.concat(matrix);
	}

	@Override public boolean onTouchEvent(MotionEvent event) {
		int x = (int) event.getX();
		int y = (int) event.getY();

		gestureDetector.onTouchEvent(event);
		scaleGestureDetector.onTouchEvent(event);

		if (event.getPointerCount() > 1) {
			pointer = true;
		}else{
			int action = event.getAction() & MotionEvent.ACTION_MASK;
			switch (action) {
				case MotionEvent.ACTION_DOWN: {
					count++;
					if (1 == count) {
						firstClick = System.currentTimeMillis();//记录第一次点击时间
					} else if (2 == count) {
						secondClick = System.currentTimeMillis();//记录第二次点击时间
						if (secondClick - firstClick < totalTime) {//判断二次点击时间间隔是否在设定的间隔时间之内
							if (!isScale) {
								if (scale < 2) {
									float scaleFactor = 2/scale;
									scale = 2;
									matrix.postScale(scaleFactor, scaleFactor, x, y);
									invalidate();
								} else {
									float scaleFactor = 1/scale;
									scale = 1;
									matrix.postScale(scaleFactor, scaleFactor, x, y);
									invalidate();
								}
							}
							count = 0;
							firstClick = 0;
						} else {
							firstClick = secondClick;
							count = 1;
						}
						secondClick = 0;
					}
					break;
				}
			}

		}


		int action = event.getAction();
		switch (action) {
			case MotionEvent.ACTION_DOWN:
				downX = x;
				downY = y;
				pointer = false;
				break;
			case MotionEvent.ACTION_MOVE:
				if (!isScale) {
					int dx = Math.abs(x - downX);
					int dy = Math.abs(y - downY);
					if (dx > 10 && dy > 10 && !pointer) {
						dx = x - lastX;
						dy = y - lastY;
						matrix.postTranslate(dx, dy);
						invalidate();
					}
				}
				break;
			case MotionEvent.ACTION_UP:
				break;
		}
		lastX = x;
		lastY = y;

		return true;
	}

	ScaleGestureDetector scaleGestureDetector = new ScaleGestureDetector(getContext(), new ScaleGestureDetector.OnScaleGestureListener() {
		@Override public boolean onScale(ScaleGestureDetector detector) {
			float scaleFactor = detector.getScaleFactor();
			if(scale * scaleFactor >= minScale && scale * scaleFactor <= maxScale){
				scale *= scaleFactor;
				matrix.postScale(scaleFactor, scaleFactor, detector.getFocusX(), detector.getFocusY());
				invalidate();
			}
			return true;
		}

		@Override public boolean onScaleBegin(ScaleGestureDetector detector) {
			isScale = true;
			return true;
		}

		@Override public void onScaleEnd(ScaleGestureDetector detector) {
			isScale = false;
		}
	});

	GestureDetector gestureDetector = new GestureDetector(getContext(), new GestureDetector.SimpleOnGestureListener() {

		@Override public boolean onSingleTapConfirmed(MotionEvent e) {
			return super.onSingleTapConfirmed(e);
		}

	});


}