/*
 * Copyright 2010, 2011, 2012, 2013 mapsforge.org
 * Copyright 2014-2016 Ludwig M Brinckmann
 * Copyright 2016-2019 devemux86
 *
 * This program is free software: you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
 * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along with
 * this program. If not, see <http://www.gnu.org/licenses/>.
 */
package org.mapsforge.map.rendertheme.renderinstruction;

import org.mapsforge.core.graphics.Align;
import org.mapsforge.core.graphics.Color;
import org.mapsforge.core.graphics.Display;
import org.mapsforge.core.graphics.FontFamily;
import org.mapsforge.core.graphics.FontStyle;
import org.mapsforge.core.graphics.GraphicFactory;
import org.mapsforge.core.graphics.Paint;
import org.mapsforge.core.graphics.Style;
import org.mapsforge.map.datastore.PointOfInterest;
import org.mapsforge.map.layer.renderer.PolylineContainer;
import org.mapsforge.map.model.DisplayModel;
import org.mapsforge.map.rendertheme.RenderCallback;
import org.mapsforge.map.rendertheme.RenderContext;
import org.mapsforge.map.rendertheme.XmlUtils;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;

import java.util.HashMap;
import java.util.Map;

/**
 * Represents a text along a polyline on the map.
 */
public class PathText extends RenderInstruction {
    private static final float REPEAT_GAP_DEFAULT = 50f;
    private static final float REPEAT_START_DEFAULT = 10f;

    private Display display;
    private float dy;
    private final Map<Byte, Float> dyScaled;
    private final Paint fill;
    private final Map<Byte, Paint> fills;
    private float fontSize;
    private int priority;
    private Scale scale = Scale.STROKE;
    private final Paint stroke;
    private final Map<Byte, Paint> strokes;
    private boolean repeat;
    private float repeatGap;
    private float repeatStart;
    private boolean rotate;
    private TextKey textKey;

    public PathText(GraphicFactory graphicFactory, DisplayModel displayModel, String elementName,
                    XmlPullParser pullParser) throws XmlPullParserException {
        super(graphicFactory, displayModel);
        this.fill = graphicFactory.createPaint();
        this.fill.setColor(Color.BLACK);
        this.fill.setStyle(Style.FILL);
        this.fill.setTextAlign(Align.CENTER);
        this.fills = new HashMap<>();
        this.rotate = true;
        this.repeat = true;

        this.stroke = graphicFactory.createPaint();
        this.stroke.setColor(Color.BLACK);
        this.stroke.setStyle(Style.STROKE);
        this.stroke.setTextAlign(Align.CENTER);
        this.strokes = new HashMap<>();
        this.dyScaled = new HashMap<>();
        this.display = Display.IFSPACE;

        extractValues(graphicFactory, displayModel, elementName, pullParser);
    }

    @Override
    public void destroy() {
        // no-op
    }

    private void extractValues(GraphicFactory graphicFactory, DisplayModel displayModel, String elementName,
                               XmlPullParser pullParser) throws XmlPullParserException {
        this.repeatGap = REPEAT_GAP_DEFAULT * displayModel.getScaleFactor();
        this.repeatStart = REPEAT_START_DEFAULT * displayModel.getScaleFactor();

        FontFamily fontFamily = FontFamily.DEFAULT;
        FontStyle fontStyle = FontStyle.NORMAL;

        for (int i = 0; i < pullParser.getAttributeCount(); ++i) {
            String name = pullParser.getAttributeName(i);
            String value = pullParser.getAttributeValue(i);

            if (K.equals(name)) {
                this.textKey = TextKey.getInstance(value);
            } else if (CAT.equals(name)) {
                this.category = value;
            } else if (DISPLAY.equals(name)) {
                this.display = Display.fromString(value);
            } else if (DY.equals(name)) {
                this.dy = Float.parseFloat(value) * displayModel.getScaleFactor();
            } else if (FILL.equals(name)) {
                this.fill.setColor(XmlUtils.getColor(graphicFactory, value, displayModel.getThemeCallback(), this));
            } else if (FONT_FAMILY.equals(name)) {
                fontFamily = FontFamily.fromString(value);
            } else if (FONT_SIZE.equals(name)) {
                this.fontSize = XmlUtils.parseNonNegativeFloat(name, value) * displayModel.getScaleFactor();
            } else if (FONT_STYLE.equals(name)) {
                fontStyle = FontStyle.fromString(value);
            } else if (REPEAT.equals(name)) {
                this.repeat = Boolean.parseBoolean(value);
            } else if (REPEAT_GAP.equals(name)) {
                this.repeatGap = Float.parseFloat(value) * displayModel.getScaleFactor();
            } else if (REPEAT_START.equals(name)) {
                this.repeatStart = Float.parseFloat(value) * displayModel.getScaleFactor();
            } else if (ROTATE.equals(name)) {
                this.rotate = Boolean.parseBoolean(value);
            } else if (PRIORITY.equals(name)) {
                this.priority = Integer.parseInt(value);
            } else if (SCALE.equals(name)) {
                this.scale = scaleFromValue(value);
            } else if (STROKE.equals(name)) {
                this.stroke.setColor(XmlUtils.getColor(graphicFactory, value, displayModel.getThemeCallback(), this));
            } else if (STROKE_WIDTH.equals(name)) {
                this.stroke.setStrokeWidth(XmlUtils.parseNonNegativeFloat(name, value) * displayModel.getScaleFactor());
            } else {
                throw XmlUtils.createXmlPullParserException(elementName, name, value, i);
            }
        }

        this.fill.setTypeface(fontFamily, fontStyle);
        this.stroke.setTypeface(fontFamily, fontStyle);

        XmlUtils.checkMandatoryAttribute(elementName, K, this.textKey);
    }

    private Paint getFillPaint(byte zoomLevel) {
        Paint paint = fills.get(zoomLevel);
        if (paint == null) {
            paint = this.fill;
        }
        return paint;
    }

    private Paint getStrokePaint(byte zoomLevel) {
        Paint paint = strokes.get(zoomLevel);
        if (paint == null) {
            paint = this.stroke;
        }
        return paint;
    }

    @Override
    public void renderNode(RenderCallback renderCallback, final RenderContext renderContext, PointOfInterest poi) {
        // do nothing
    }

    @Override
    public void renderWay(RenderCallback renderCallback, final RenderContext renderContext, PolylineContainer way) {
        if (Display.NEVER == this.display) {
            return;
        }

        String caption = this.textKey.getValue(way.getTags());
        if (caption == null) {
            return;
        }

        Float dyScale = this.dyScaled.get(renderContext.rendererJob.tile.zoomLevel);
        if (dyScale == null) {
            dyScale = this.dy;
        }

        renderCallback.renderWayText(renderContext, this.display, this.priority, caption, dyScale,
                getFillPaint(renderContext.rendererJob.tile.zoomLevel),
                getStrokePaint(renderContext.rendererJob.tile.zoomLevel),
                this.repeat, this.repeatGap, this.repeatStart, this.rotate,
                way);
    }

    @Override
    public void scaleStrokeWidth(float scaleFactor, byte zoomLevel) {
        if (this.scale == Scale.NONE) {
            scaleFactor = 1;
        }
        this.dyScaled.put(zoomLevel, this.dy * scaleFactor);
    }

    @Override
    public void scaleTextSize(float scaleFactor, byte zoomLevel) {
        Paint zlPaint = graphicFactory.createPaint(this.fill);
        zlPaint.setTextSize(this.fontSize * scaleFactor);
        this.fills.put(zoomLevel, zlPaint);

        Paint zlStroke = graphicFactory.createPaint(this.stroke);
        zlStroke.setTextSize(this.fontSize * scaleFactor);
        this.strokes.put(zoomLevel, zlStroke);
    }
}
