/*-
 * ============LICENSE_START=======================================================
 * ONAP CLAMP
 * ================================================================================
 * Copyright (C) 2019 Nokia. All rights
 *                             reserved.
 * ================================================================================
 * Modifications Copyright (c) 2019 Samsung
 * ================================================================================
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * ============LICENSE_END============================================
 * Modifications copyright (c) 2019 AT&T.
 * ===================================================================
 *
 */

package org.onap.clamp.clds.util.drawing;

import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.Rectangle;

public class AwtUtils {
    private static final int ARROW_W = 4;
    private static final int ARROW_H = 2;
    private static final int FONT_SIZE = 12;
    private static final int FONT_STYLE = Font.PLAIN;
    private static final String FONT_FACE = "SansSerif";
    private static final Color TRANSPARENT = new Color(0.0f, 0.0f, 0.0f, 0.0f);
    private  static final int TEXT_PADDING = 5;

    private AwtUtils() {
    }

    static void rectWithText(Graphics2D g2d, String text, Point point, int width, int height) {
        Rectangle rect = new Rectangle(point.x, point.y, width, height);
        g2d.draw(rect);
        Color oldColor = g2d.getColor();
        g2d.setColor(TRANSPARENT);
        g2d.fill(rect);
        g2d.setColor(oldColor);
        addText(g2d, text, rect);
    }

    static void drawArrow(Graphics2D g2d, Point from, Point to, int lineThickness) {
        int x2 = to.x - lineThickness;
        g2d.drawLine(from.x, from.y, x2 - lineThickness, to.y);
        g2d.drawPolygon(new int[]{x2 - ARROW_W, x2 - ARROW_W, x2}, new int[]{to.y - ARROW_H, to.y + ARROW_H, to.y}, 3);
        g2d.fillPolygon(new int[]{x2 - ARROW_W, x2 - ARROW_W, x2}, new int[]{to.y - ARROW_H, to.y + ARROW_H, to.y}, 3);
    }

    private static void addText(Graphics2D g2d, String text, Rectangle rect) {
        int textBoundingBoxLimit = rect.width - 2* TEXT_PADDING;
        Font font = new Font(FONT_FACE, FONT_STYLE, FONT_SIZE);
        font = scaleFontToFit(text, textBoundingBoxLimit, g2d, font);
        Font oldFont = g2d.getFont();

        g2d.setFont(font);
        g2d.setColor(Color.BLACK);
        FontMetrics fm1 = g2d.getFontMetrics();
        float x1 = rect.x + (float)(rect.width - fm1.stringWidth(text)) / 2;
        float y1 = rect.y + (float)(rect.height - fm1.getHeight()) / 2 + fm1.getAscent();
        g2d.drawString(text, x1, y1);

        g2d.setFont(oldFont);
    }

    private static Font scaleFontToFit(String text, int width, Graphics2D g2d, Font pFont) {
        float fontSize = pFont.getSize();
        float fWidth = g2d.getFontMetrics(pFont).stringWidth(text);
        if(fWidth <= width) {
            return pFont;
        }
        fontSize = ((float)width / fWidth) * fontSize;
        return pFont.deriveFont(fontSize);
    }

}