/*
 * $Id$
 * 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.
 */

package org.apache.fop.fo.flow;

// FOP
import org.apache.fop.fo.*;
import org.apache.fop.fo.properties.*;
import org.apache.fop.datatypes.Length;
import org.apache.fop.area.Area;
import org.apache.fop.area.inline.InlineArea;
import org.apache.fop.area.inline.Viewport;
import org.apache.fop.area.inline.ForeignObject;
import org.apache.fop.layout.FontState;
import org.apache.fop.layout.AccessibilityProps;
import org.apache.fop.layout.AuralProps;
import org.apache.fop.layout.BorderAndPadding;
import org.apache.fop.layout.BackgroundProps;
import org.apache.fop.layout.MarginInlineProps;
import org.apache.fop.layout.RelativePositionProps;
import org.apache.fop.apps.FOPException;
import org.apache.fop.layoutmgr.LayoutManager;
import org.apache.fop.layoutmgr.LeafNodeLayoutManager;
import org.apache.fop.layoutmgr.LayoutInfo;

import org.w3c.dom.Document;

import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.util.List;

public class InstreamForeignObject extends FObj {

    int breakBefore;
    int breakAfter;
    int spaceBefore;
    int spaceAfter;
    int startIndent;
    int endIndent;

    Viewport areaCurrent;

    /**
     * constructs an instream-foreign-object object (called by Maker).
     *
     * @param parent the parent formatting object
     * @param propertyList the explicit properties of this object
     */
    public InstreamForeignObject(FONode parent) {
        super(parent);
    }

    public void addLayoutManager(List list) {
        LeafNodeLayoutManager lm = new LeafNodeLayoutManager(this);
        lm.setCurrentArea(getInlineArea());
        list.add(lm);
    }

    /**
     * Get the inline area created by this element.
     */
    protected InlineArea getInlineArea() {
        if (children == null) {
            return areaCurrent;
        }

        if (this.children.size() != 1) {
            // error
            return null;
        }
        FONode fo = (FONode)children.get(0);
        if(!(fo instanceof XMLObj)) {
            // error
            return null;
        }
        XMLObj child = (XMLObj)fo;

        // Common Accessibility Properties
        AccessibilityProps mAccProps = propMgr.getAccessibilityProps();

        // Common Aural Properties
        AuralProps mAurProps = propMgr.getAuralProps();

        // Common Border, Padding, and Background Properties
        BorderAndPadding bap = propMgr.getBorderAndPadding();
        BackgroundProps bProps = propMgr.getBackgroundProps();

        // Common Margin Properties-Inline
        MarginInlineProps mProps = propMgr.getMarginInlineProps();

        // Common Relative Position Properties
        RelativePositionProps mRelProps = propMgr.getRelativePositionProps();

        // viewport size is determined by block-progression-dimension
        // and inline-progression-dimension

        // if replaced then use height then ignore block-progression-dimension
        //int h = this.properties.get("height").getLength().mvalue();

        // use specified line-height then ignore dimension in height direction
        boolean hasLH = false;//properties.get("line-height").getSpecifiedValue() != null;

        Length len;

        int bpd = -1;
        int ipd = -1;
        boolean bpdauto = false;
        if(hasLH) {
            bpd = properties.get("line-height").getLength().mvalue();
        } else {
            // this property does not apply when the line-height applies
            // isn't the block-progression-dimension always in the same
            // direction as the line height?
            len = properties.get("block-progression-dimension.optimum").getLength();
            if(!len.isAuto()) {
                bpd = len.mvalue();
            } else {
                len = properties.get("height").getLength();
                if(!len.isAuto()) {
                    bpd = len.mvalue();
                }
            }
        }

        len = properties.get("inline-progression-dimension.optimum").getLength();
        if(!len.isAuto()) {
            ipd = len.mvalue();
        } else {
            len = properties.get("width").getLength();
            if(!len.isAuto()) {
                ipd = len.mvalue();
            }
        }

        // if auto then use the intrinsic size of the content scaled
        // to the content-height and content-width
        int cwidth = -1;
        int cheight = -1;
        len = properties.get("content-width").getLength();
        if(!len.isAuto()) {
            /*if(len.scaleToFit()) {
                if(ipd != -1) {
                    cwidth = ipd;
                }
            } else {*/
            cwidth = len.mvalue();
        }
        len = properties.get("content-height").getLength();
        if(!len.isAuto()) {
            /*if(len.scaleToFit()) {
                if(bpd != -1) {
                    cwidth = bpd;
                }
            } else {*/
            cheight = len.mvalue();
        }

        Point2D csize = new Point2D.Float(cwidth == -1 ? -1 : cwidth / 1000f, cheight == -1 ? -1 : cheight / 1000f);
        Point2D size = child.getDimension(csize);
        if(size == null) {
            // error
            return null;
        }
        if(cwidth == -1) {
            cwidth = (int)size.getX() * 1000;
        }
        if(cheight == -1) {
            cheight = (int)size.getY() * 1000;
        }
        int scaling = properties.get("scaling").getEnum();
        if(scaling == Scaling.UNIFORM) {
            // adjust the larger
            double rat1 = cwidth / (size.getX() * 1000f);
            double rat2 = cheight / (size.getY() * 1000f);
            if(rat1 < rat2) {
                // reduce cheight
                cheight = (int)(rat1 * size.getY() * 1000);
            } else {
                cwidth = (int)(rat2 * size.getX() * 1000);
            }
        }

        if(ipd == -1) {
            ipd = cwidth;
        }
        if(bpd == -1) {
            bpd = cheight;
        }

        boolean clip = false;
        if(cwidth > ipd || cheight > bpd) {
            int overflow = properties.get("overflow").getEnum();
            if(overflow == Overflow.HIDDEN) {
                clip = true;
            } else if(overflow == Overflow.ERROR_IF_OVERFLOW) {
                getLogger().error("Instream foreign object overflows the viewport");
                clip = true;
            }
        }

        int xoffset = 0;
        int yoffset = 0;
        int da = properties.get("display-align").getEnum();
        switch(da) {
            case DisplayAlign.BEFORE:
            break;
            case DisplayAlign.AFTER:
                yoffset = bpd - cheight;
            break;
            case DisplayAlign.CENTER:
                yoffset = (bpd - cheight) / 2;
            break;
            case DisplayAlign.AUTO:
            default:
            break;
        }

        int ta = properties.get("text-align").getEnum();
        switch(ta) {
            case TextAlign.CENTER:
                xoffset = (ipd - cwidth) / 2;
            break;
            case TextAlign.END:
                xoffset = ipd - cwidth;
            break;
            case TextAlign.START:
            break;
            case TextAlign.JUSTIFY:
            default:
            break;
        }
        Rectangle2D placement = new Rectangle2D.Float(xoffset, yoffset, cwidth, cheight);

        Document doc = child.getDocument();
        String ns = child.getDocumentNamespace();

        children = null;
        ForeignObject foreign = new ForeignObject(doc, ns);

        areaCurrent = new Viewport(foreign);
        areaCurrent.setWidth(ipd);
        areaCurrent.setHeight(bpd);
        areaCurrent.setContentPosition(placement);
        areaCurrent.setClip(clip);
        areaCurrent.setOffset(0);
        areaCurrent.info = new LayoutInfo();
        areaCurrent.info.alignment = properties.get("vertical-align").getEnum();
        areaCurrent.info.lead = areaCurrent.getHeight();

        return areaCurrent;
    }

    public boolean generatesInlineAreas() {
        return true;
    }

    /*

            // Common Accessibility Properties
            AccessibilityProps mAccProps = propMgr.getAccessibilityProps();

            // Common Aural Properties
            AuralProps mAurProps = propMgr.getAuralProps();

            // Common Border, Padding, and Background Properties
            BorderAndPadding bap = propMgr.getBorderAndPadding();
            BackgroundProps bProps = propMgr.getBackgroundProps();

            // Common Margin Properties-Inline
            MarginInlineProps mProps = propMgr.getMarginInlineProps();

            // Common Relative Position Properties
            RelativePositionProps mRelProps = propMgr.getRelativePositionProps();

            // this.properties.get("alignment-adjust");
            // this.properties.get("alignment-baseline");
            // this.properties.get("baseline-shift");
            // this.properties.get("block-progression-dimension");
            // this.properties.get("content-height");
            // this.properties.get("content-type");
            // this.properties.get("content-width");
            // this.properties.get("display-align");
            // this.properties.get("dominant-baseline");
            // this.properties.get("height");
            setupID();
            // this.properties.get("inline-progression-dimension");
            // this.properties.get("keep-with-next");
            // this.properties.get("keep-with-previous");
            // this.properties.get("line-height");
            // this.properties.get("line-height-shift-adjustment");
            // this.properties.get("overflow");
            // this.properties.get("scaling");
            // this.properties.get("scaling-method");
            // this.properties.get("text-align");
            // this.properties.get("width");

            /* retrieve properties *
            int align = this.properties.get("text-align").getEnum();
            int valign = this.properties.get("vertical-align").getEnum();
            int overflow = this.properties.get("overflow").getEnum();

            this.breakBefore = this.properties.get("break-before").getEnum();
            this.breakAfter = this.properties.get("break-after").getEnum();
            this.width = this.properties.get("width").getLength().mvalue();
            this.height = this.properties.get("height").getLength().mvalue();
            this.contwidth =
                this.properties.get("content-width").getLength().mvalue();
            this.contheight =
                this.properties.get("content-height").getLength().mvalue();
            this.wauto = this.properties.get("width").getLength().isAuto();
            this.hauto = this.properties.get("height").getLength().isAuto();
            this.cwauto =
                this.properties.get("content-width").getLength().isAuto();
            this.chauto =
                this.properties.get("content-height").getLength().isAuto();

            this.startIndent =
                this.properties.get("start-indent").getLength().mvalue();
            this.endIndent =
                this.properties.get("end-indent").getLength().mvalue();
            this.spaceBefore =
                this.properties.get("space-before.optimum").getLength().mvalue();
            this.spaceAfter =
                this.properties.get("space-after.optimum").getLength().mvalue();

            this.scaling = this.properties.get("scaling").getEnum();

*/
}