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/* ====================================================================
   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You 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.
==================================================================== */

package org.apache.poi.xdgf.usermodel;

import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.font.FontRenderContext;
import java.awt.font.TextLayout;
import java.awt.geom.AffineTransform;
import java.awt.geom.Path2D;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;

import org.apache.poi.util.Internal;

import com.microsoft.schemas.office.visio.x2012.main.TextType;
import com.microsoft.schemas.office.visio.x2012.main.impl.TextTypeImpl;

public class XDGFText {

    TextType _text;
    XDGFShape _parent;

    public XDGFText(TextType text, XDGFShape parent) {
        _text = text;
        _parent = parent;
    }

    @Internal
    TextType getXmlObject() {
        return _text;
    }

    public String getTextContent() {
        // casting here is wrong, but there's no other way of getting the value,
        // as it doesn't seem to be exposed by complex types (even though this
        // is a mixed type)
        return ((TextTypeImpl) _text).getStringValue();
    }
    
    /**
     * These are in the shape coordinate system
     *
     * @see Text Block Coordinate System docs
     */
    public Rectangle2D.Double getTextBounds() {

        double txtPinX = _parent.getTxtPinX();
        double txtPinY = _parent.getTxtPinY();

        double txtLocPinX = _parent.getTxtLocPinX();
        double txtLocPinY = _parent.getTxtLocPinY();

        double txtWidth = _parent.getTxtWidth();
        double txtHeight = _parent.getTxtHeight();

        double x = txtPinX - txtLocPinX;
        double y = txtPinY - txtLocPinY;

        return new Rectangle2D.Double(x, y, txtWidth, txtHeight);
    }

    /**
     * @return Text bounds as a path in local coordinates, which is useful
     *         if you need to transform to global coordinates
     */
    public Path2D.Double getBoundsAsPath() {

        Rectangle2D.Double rect = getTextBounds();
        Double w = rect.getWidth();
        Double h = rect.getHeight();

        Path2D.Double bounds = new Path2D.Double();
        bounds.moveTo(0, 0);
        bounds.lineTo(w, 0);
        bounds.lineTo(w, h);
        bounds.lineTo(0, h);
        bounds.lineTo(0, 0);

        return bounds;
    }
    
    /**
     * @return Center of text in local coordinates
     */
    public Point2D.Double getTextCenter() {
        return new Point2D.Double(_parent.getTxtLocPinX(),
                _parent.getTxtLocPinY());
    }

    /**
     * When calling this to draw text, it assumes graphics is set properly
     * to draw in the right style.
     */
    public void draw(Graphics2D graphics) {

        String textContent = getTextContent();
        if (textContent.length() == 0)
            return;

        Rectangle2D.Double bounds = getTextBounds();

        String[] lines = textContent.trim().split("\n");
        FontRenderContext frc = graphics.getFontRenderContext();
        Font font = graphics.getFont();

        AffineTransform oldTr = graphics.getTransform();

        // visio is in flipped coordinates, so translate the text to be in the
        // right place
        Boolean flipX = _parent.getFlipX();
        Boolean flipY = _parent.getFlipY();

        if (flipY == null || !_parent.getFlipY()) {
            graphics.translate(bounds.x, bounds.y);
            graphics.scale(1, -1);
            graphics.translate(0, -bounds.height
                    + graphics.getFontMetrics().getMaxCharBounds(graphics)
                    .getHeight());
        }

        if (flipX != null && _parent.getFlipX()) {
            graphics.scale(-1, 1);
            graphics.translate(-bounds.width, 0);
        }

        Double txtAngle = _parent.getTxtAngle();
        if (txtAngle != null && Math.abs(txtAngle) > 0.01)
            graphics.rotate(txtAngle);

        float nextY = 0;
        for (String line : lines) {

            if (line.length() == 0)
                continue;

            TextLayout layout = new TextLayout(line, font, frc);

            if (layout.isLeftToRight())
                layout.draw(graphics, 0, nextY);
            else
                layout.draw(graphics,
                        (float) (bounds.width - layout.getAdvance()), nextY);

            nextY += layout.getAscent() + layout.getDescent()
                    + layout.getLeading();
        }

        graphics.setTransform(oldTr);
    }
}