/*
 * The MIT License (MIT)
 * <p/>
 * Copyright (c) 2016. Viнt@rь
 * <p/>
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * <p/>
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * <p/>
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package com.tooltip;

import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ColorFilter;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PixelFormat;
import android.graphics.Rect;
import android.graphics.drawable.ColorDrawable;
import android.support.annotation.ColorInt;
import android.view.Gravity;

/**
 * Implementation arrow drawable for tooltip
 */
final class ArrowDrawable extends ColorDrawable {

    private final Paint mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
    private final int mBackgroundColor;
    private final int mGravity;

    private Path mPath;

    ArrowDrawable(@ColorInt int foregroundColor, int gravity) {
        mGravity = Util.gravityToArrowDirection(gravity);
        mBackgroundColor = Color.TRANSPARENT;

        mPaint.setColor(foregroundColor);
    }

    @Override
    protected void onBoundsChange(Rect bounds) {
        super.onBoundsChange(bounds);
        updatePath(bounds);
    }

    private synchronized void updatePath(Rect bounds) {
        mPath = new Path();

        switch (mGravity) {
            case Gravity.START:
                mPath.moveTo(bounds.width(), bounds.height());
                mPath.lineTo(0, bounds.height() / 2);
                mPath.lineTo(bounds.width(), 0);
                mPath.lineTo(bounds.width(), bounds.height());
                break;
            case Gravity.TOP:
                mPath.moveTo(0, bounds.height());
                mPath.lineTo(bounds.width() / 2, 0);
                mPath.lineTo(bounds.width(), bounds.height());
                mPath.lineTo(0, bounds.height());
                break;
            case Gravity.END:
                mPath.moveTo(0, 0);
                mPath.lineTo(bounds.width(), bounds.height() / 2);
                mPath.lineTo(0, bounds.height());
                mPath.lineTo(0, 0);
                break;
            case Gravity.BOTTOM:
                mPath.moveTo(0, 0);
                mPath.lineTo(bounds.width() / 2, bounds.height());
                mPath.lineTo(bounds.width(), 0);
                mPath.lineTo(0, 0);
                break;
        }

        mPath.close();
    }

    @Override
    public void draw(Canvas canvas) {
        canvas.drawColor(mBackgroundColor);
        if (mPath == null) {
            updatePath(getBounds());
        }
        canvas.drawPath(mPath, mPaint);
    }

    @Override
    public void setAlpha(int alpha) {
        mPaint.setAlpha(alpha);
    }

    public void setColor(@ColorInt int color) {
        mPaint.setColor(color);
    }

    @Override
    public void setColorFilter(ColorFilter colorFilter) {
        mPaint.setColorFilter(colorFilter);
    }

    @Override
    public int getOpacity() {
        if (mPaint.getColorFilter() != null) {
            return PixelFormat.TRANSLUCENT;
        }

        switch (mPaint.getColor() >>> 24) {
            case 255:
                return PixelFormat.OPAQUE;
            case 0:
                return PixelFormat.TRANSPARENT;
        }
        return PixelFormat.TRANSLUCENT;
    }
}