/*
 * $Id$
 * Copyright (C) 2001 The Apache Software Foundation. All rights reserved.
 * For details on use and redistribution please refer to the
 * LICENSE file included with these sources.
 */

// Author : Seshadri G

package org.apache.fop.render.mif;

// FOP
import org.apache.fop.render.Renderer;
import org.apache.fop.messaging.MessageHandler;
import org.apache.fop.image.ImageArea;
import org.apache.fop.image.FopImage;
import org.apache.fop.apps.FOPException;
import org.apache.fop.fo.properties.*;
import org.apache.fop.fo.*;
import org.apache.fop.layout.*;
import org.apache.fop.layout.inline.*;
import org.apache.fop.datatypes.*;
import org.apache.fop.svg.*;
import org.apache.fop.mif.*;
import org.apache.fop.layout.*;
import org.apache.fop.image.*;

import org.w3c.dom.*;
import org.w3c.dom.svg.*;
import org.w3c.dom.css.*;
import org.w3c.dom.svg.SVGLength;

// Java
import java.io.IOException;
import java.io.OutputStream;
import java.util.Enumeration;
import java.awt.Rectangle;
import java.util.Vector;
import java.util.Hashtable;

/**
 * Renderer that renders areas to MIF
 */
public class MIFRenderer implements Renderer {

    private String currentFontName;
    private String currentFontSize;
    private int pageHeight;
    private int pageWidth;

    /**
     * the current vertical position in millipoints from bottom
     */
    protected int currentYPosition = 0;

    /**
     * the current horizontal position in millipoints from left
     */
    protected int currentXPosition = 0;

    /**
     * the horizontal position of the current area container
     */
    private int currentAreaContainerXPosition = 0;


    /**
     * the MIF Document being created
     */
    protected MIFDocument mifDoc;


    /* is a table currently open? */
    private boolean inTable = false;

    /**
     * options
     */
    protected Hashtable options;

    /**
     * create the MIF renderer
     */
    public MIFRenderer() {
        this.mifDoc = new MIFDocument();
    }

    /**
     * set up renderer options
     */
    public void setOptions(Hashtable options) {
        this.options = options;
    }

    /**
     * render the areas into MIF
     *
     * @param areaTree the laid-out area tree
     * @param writer the PrintWriter to write the MIF with
     */

    public void render(AreaTree areaTree,
                       OutputStream stream) throws IOException, FOPException {

        MessageHandler.logln("rendering areas to MIF");
        // idReferences=areaTree.getIDReferences();
        // this.pdfResources = this.pdfDoc.getResources();
        // this.pdfDoc.setIDReferences(idReferences);
        Enumeration e = areaTree.getPages().elements();
        while (e.hasMoreElements()) {
            this.renderPage((Page)e.nextElement());
        }

        // MessageHandler.logln("writing out MIF");

        this.mifDoc.output(stream);
        stream.close();
    }

    /**
     * set up the given FontInfo
     */
    public void setupFontInfo(FontInfo fontInfo) {

        FontSetup.setup(fontInfo);
        // FontSetup.addToFontFormat(this.mifDoc, fontInfo);

    }

    /**
     * set the producer of the rendering
     */
    public void setProducer(String producer) {}

    public void renderAreaContainer(AreaContainer area) {

        if (area.foCreator != null
                && area.foCreator.getName() == "fo:table") {

            this.mifDoc.createTable();
            this.inTable = true;
        } else if (area.foCreator != null
                   && area.foCreator.getName() == "fo:table-body") {

            this.mifDoc.setCurrent("fo:table-body");
        } else if (area.foCreator != null
                   && area.foCreator.getName() == "fo:table-column") {

            int colWidth =
                ((org.apache.fop.fo.flow.TableColumn)area.foCreator).getColumnWidth();
            this.mifDoc.setColumnProp(colWidth);
        } else if (area.foCreator != null
                   && area.foCreator.getName() == "fo:table-row") {

            this.mifDoc.startRow();
        } else if (area.foCreator != null
                   && area.foCreator.getName() == "fo:table-cell") {

            int rowSpan =
                ((org.apache.fop.fo.flow.TableCell)area.foCreator).getNumRowsSpanned();
            int colSpan =
                ((org.apache.fop.fo.flow.TableCell)area.foCreator).getNumColumnsSpanned();
            this.mifDoc.startCell(rowSpan, colSpan);
        } else if (inTable) {

            inTable = false;
            this.mifDoc.endTable();

        }
        int saveY = this.currentYPosition;
        int saveX = this.currentAreaContainerXPosition;

        if (area.getPosition() == Position.ABSOLUTE) {
            // Y position is computed assuming positive Y axis, adjust for negative postscript one
            this.currentYPosition = area.getYPosition()
                                    - 2 * area.getPaddingTop()
                                    - 2 * area.getBorderTopWidth();

            this.currentAreaContainerXPosition = area.getXPosition();
        } else if (area.getPosition() == Position.RELATIVE) {

            this.currentYPosition -= area.getYPosition();
            this.currentAreaContainerXPosition += area.getXPosition();

        } else if (area.getPosition() == Position.STATIC) {

            this.currentYPosition -= area.getPaddingTop()
                                     + area.getBorderTopWidth();
            this.currentAreaContainerXPosition += area.getPaddingLeft()
                                                  + area.getBorderLeftWidth();
        }

        this.currentXPosition = this.currentAreaContainerXPosition;
        doFrame(area);

        Enumeration e = area.getChildren().elements();
        while (e.hasMoreElements()) {
            Box b = (Box)e.nextElement();
            b.render(this);
        }
        if (area.getPosition() != Position.STATIC) {
            this.currentYPosition = saveY;
            this.currentAreaContainerXPosition = saveX;
        } else
            this.currentYPosition -= area.getHeight();
    }

    public void renderBodyAreaContainer(BodyAreaContainer area) {


        int saveY = this.currentYPosition;
        int saveX = this.currentAreaContainerXPosition;

        if (area.getPosition() == Position.ABSOLUTE) {
            // Y position is computed assuming positive Y axis, adjust for negative postscript one
            this.currentYPosition = area.getYPosition();
            this.currentAreaContainerXPosition = area.getXPosition();
        } else if (area.getPosition() == Position.RELATIVE) {
            this.currentYPosition -= area.getYPosition();
            this.currentAreaContainerXPosition += area.getXPosition();
        }

        this.currentXPosition = this.currentAreaContainerXPosition;
        int w, h;
        int rx = this.currentAreaContainerXPosition;
        w = area.getContentWidth();
        h = area.getContentHeight();
        int ry = this.currentYPosition;
        ColorType bg = area.getBackgroundColor();

        /*
         * // I'm not sure I should have to check for bg being null
         * // but I do
         * if ((bg != null) && (bg.alpha() == 0)) {
         * this.addRect(rx, ry, w, -h, new PDFColor(bg), new PDFColor(bg));
         * }
         */
        /*
         * // floats & footnotes stuff
         * renderAreaContainer(area.getBeforeFloatReferenceArea());
         * renderAreaContainer(area.getFootnoteReferenceArea());
         */
        // main reference area
        Enumeration e = area.getMainReferenceArea().getChildren().elements();
        while (e.hasMoreElements()) {
            Box b = (Box)e.nextElement();
            b.render(this);    // span areas
        }

        if (area.getPosition() != Position.STATIC) {
            this.currentYPosition = saveY;
            this.currentAreaContainerXPosition = saveX;
        } else
            this.currentYPosition -= area.getHeight();

    }

    private void doFrame(Area area) {
        int w, h;
        int rx = this.currentAreaContainerXPosition;
        w = area.getContentWidth();

        if (area instanceof BlockArea)
            rx += ((BlockArea)area).getStartIndent();

        h = area.getContentHeight();
        int ry = this.currentYPosition;
        ColorType bg = area.getBackgroundColor();

        rx = rx - area.getPaddingLeft();
        ry = ry + area.getPaddingTop();
        w = w + area.getPaddingLeft() + area.getPaddingRight();
        h = h + area.getPaddingTop() + area.getPaddingBottom();

        /*
         * // I'm not sure I should have to check for bg being null
         * // but I do
         * if ((bg != null) && (bg.alpha() == 0)) {
         * this.addRect(rx, ry, w, -h,
         * new PDFColor(bg),
         * new PDFColor(bg));
         * }
         */

        rx = rx - area.getBorderLeftWidth();
        ry = ry + area.getBorderTopWidth();
        w = w + area.getBorderLeftWidth() + area.getBorderRightWidth();
        h = h + area.getBorderTopWidth() + area.getBorderBottomWidth();

        // Create a textrect with these dimensions.
        // The y co-ordinate is measured +ve downwards so subtract page-height

        this.mifDoc.setTextRectProp(rx, pageHeight - ry, w, h);

        /*
         * BorderAndPadding bp = area.getBorderAndPadding();
         * if (area.getBorderTopWidth() != 0)
         * addLine(rx, ry, rx + w, ry, area.getBorderTopWidth(),
         * new PDFColor(bp.getBorderColor(BorderAndPadding.TOP)));
         * if (area.getBorderLeftWidth() != 0)
         * addLine(rx, ry, rx, ry - h, area.getBorderLeftWidth(),
         * new PDFColor(bp.getBorderColor(BorderAndPadding.LEFT)));
         * if (area.getBorderRightWidth() != 0)
         * addLine(rx + w, ry, rx + w, ry - h, area.getBorderRightWidth(),
         * new PDFColor(bp.getBorderColor(BorderAndPadding.RIGHT)));
         * if (area.getBorderBottomWidth() != 0)
         * addLine(rx, ry - h, rx + w, ry - h, area.getBorderBottomWidth(),
         * new PDFColor(bp.getBorderColor(BorderAndPadding.BOTTOM)));
         */
    }

    public void renderSpanArea(SpanArea area) {

        // A span maps to a textframe


        this.mifDoc.createTextRect(area.getColumnCount());

        Enumeration e = area.getChildren().elements();
        while (e.hasMoreElements()) {
            Box b = (Box)e.nextElement();
            b.render(this);    // column areas
        }
    }

    /**
     * render the given block area
     */
    public void renderBlockArea(BlockArea area) {

        this.mifDoc.setBlockProp(area.getStartIndent(), area.getEndIndent());
        Enumeration e = area.getChildren().elements();
        while (e.hasMoreElements()) {
            Box b = (Box)e.nextElement();
            b.render(this);
        }

    }

    /**
     * render the given display space
     */
    public void renderDisplaySpace(DisplaySpace space) {

        int d = space.getSize();
        this.currentYPosition -= d;

    }

    /**
     * render the given SVG area
     */
    public void renderSVGArea(SVGArea area) {}

    /**
     * render a foreign object area
     */
    public void renderForeignObjectArea(ForeignObjectArea area) {}

    public void renderWordArea(WordArea area) {
        String s;
        s = area.getText();
        this.mifDoc.addToStream(s);

        this.currentXPosition += area.getContentWidth();
    }

    /**
     * render the given image area
     */
    public void renderImageArea(ImageArea area) {

        int x = this.currentAreaContainerXPosition + area.getXOffset();
        int y = this.currentYPosition;
        int w = area.getContentWidth();
        int h = area.getHeight();

        this.currentYPosition -= h;

        FopImage img = area.getImage();
        if (img instanceof SVGImage) {
            /*
             * try {
             * SVGSVGElement svg =
             * ((SVGImage) img).getSVGDocument().getRootElement();
             * currentStream.add("ET\nq\n" + (((float) w) / 1000f) +
             * " 0 0 " + (((float) h) / 1000f) + " " +
             * (((float) x) / 1000f) + " " +
             * (((float)(y - h)) / 1000f) + " cm\n");
             * //        renderSVG(svg, (int) x, (int) y);
             * currentStream.add("Q\nBT\n");
             * } catch (FopImageException e) {
             * }
             */

            MessageHandler.logln("Warning: SVG images not supported in this version");
        } else {
            String url = img.getURL();
            this.mifDoc.addImage(url, x, pageHeight - y, w, h);

        }
    }

    /**
     * render the given inline area
     */
    public void renderInlineArea(InlineArea area) {}

    /**
     * render the given inline space
     */
    public void renderInlineSpace(InlineSpace space) {

        // I dont need the size of space! I just need to
        // leave a blank space each time
        String s = " ";
        this.mifDoc.addToStream(s);    // cool!
        this.currentXPosition += space.getSize();
    }

    /**
     * render the given line area
     */
    public void renderLineArea(LineArea area) {

        int rx = this.currentAreaContainerXPosition + area.getStartIndent();
        int ry = this.currentYPosition;
        int w = area.getContentWidth();
        int h = area.getHeight();

        this.currentYPosition -= area.getPlacementOffset();
        this.currentXPosition = rx;

        int bl = this.currentYPosition;

        // The start of a new linearea corresponds to a new para in FM

        this.mifDoc.startLine();

        Enumeration e = area.getChildren().elements();
        while (e.hasMoreElements()) {

            Box b = (Box)e.nextElement();
            this.currentYPosition = ry - area.getPlacementOffset();
            b.render(this);

        }
        this.currentYPosition = ry - h;
        this.currentXPosition = rx;

    }

    /**
     * render the given page
     */
    public void renderPage(Page page) {

        AreaContainer before, after;
        BodyAreaContainer body;
        body = page.getBody();
        before = page.getBefore();
        after = page.getAfter();

        this.currentFontName = "";
        this.currentFontSize = "0";

        pageHeight = page.getHeight();
        pageWidth = page.getWidth();
        this.mifDoc.setDocumentHeightWidth(pageHeight, pageWidth);

        this.mifDoc.createPage();

        renderBodyAreaContainer(body);


        // If the area is an instance of anything other than body, it goes into the
        // corresponding master page.


        if (before != null) {

            this.mifDoc.createTextRect(1);    // Create a rect with one col
            renderAreaContainer(before);
        }

        if (after != null) {

            this.mifDoc.createTextRect(1);    // Create a rect with one col
            renderAreaContainer(after);
        }

    }

    /**
     * render the given leader area
     */
    public void renderLeaderArea(LeaderArea area) {}

}