/* $Id$
 * 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.apps;

// FOP
import org.apache.fop.fo.FOTreeBuilder;
import org.apache.fop.fo.ElementMapping;
import org.apache.fop.fo.PropertyListMapping;
import org.apache.fop.layout.AreaTree;
import org.apache.fop.layout.FontInfo;
import org.apache.fop.render.Renderer;
import org.apache.fop.messaging.MessageHandler;
import org.apache.fop.configuration.ConfigurationReader;
import org.apache.fop.configuration.Configuration;
import org.apache.fop.tools.DocumentInputSource;
import org.apache.fop.tools.DocumentReader;

import org.apache.fop.system.BufferManager;

// DOM
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Attr;

// SAX
import org.xml.sax.ContentHandler;
import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.AttributesImpl;

// Java
import java.io.*;


/**
 * Primary class that drives overall FOP process.
 * <P>
 * The simplest way to use this is to instantiate it with the
 * InputSource and OutputStream, then set the renderer desired, and
 * calling run();
 * <P>
 * Here is an example use of Driver which outputs PDF:
 *
 * <PRE>
 *   Driver driver = new Driver(new InputSource (args[0]),
 *                              new FileOutputStream(args[1]));
 *   driver.setRenderer(RENDER_PDF);
 *   driver.run();
 * </PRE>

 * If neccessary, calling classes can call into the lower level
 * methods to setup and
 * render. Methods can be called to set the
 * Renderer to use, the (possibly multiple) ElementMapping(s) to
 * use and the OutputStream to use to output the results of the
 * rendering (where applicable). In the case of the Renderer and
 * ElementMapping(s), the Driver may be supplied either with the
 * object itself, or the name of the class, in which case Driver will
 * instantiate the class itself. The advantage of the latter is it
 * enables runtime determination of Renderer and ElementMapping(s).
 * <P>
 * Once the Driver is set up, the buildFOTree method
 * is called. Depending on whether DOM or SAX is being used, the
 * invocation of the method is either buildFOTree(Document) or
 * buildFOTree(Parser, InputSource) respectively.
 * <P>
 * A third possibility may be used to build the FO Tree, namely
 * calling getContentHandler() and firing the SAX events yourself.
 * <P>
 * Once the FO Tree is built, the format() and render() methods may be
 * called in that order.
 * <P>
 * Here is an example use of Driver which outputs to AWT:
 *
 * <PRE>
 *   Driver driver = new Driver();
 *   driver.setRenderer(new org.apache.fop.render.awt.AWTRenderer(translator));
 *   driver.buildFOTree(parser, fileInputSource(args[0]));
 *   driver.format();
 *   driver.render();
 * </PRE>
 */
public class Driver {

    /** Render to PDF. OutputStream must be set */
    public static final int RENDER_PDF = 1;

    /** Render to a GUI window. No OutputStream neccessary */
    public static final int RENDER_AWT = 2;

    /** Render to MIF. OutputStream must be set */
    public static final int RENDER_MIF = 3;

    /** Render to XML. OutputStream must be set */
    public static final int RENDER_XML = 4;

    /** Render to PRINT. No OutputStream neccessary */
    public static final int RENDER_PRINT = 5;

    /** Render to PCL. OutputStream must be set */
    public static final int RENDER_PCL = 6;

    /** Render to Postscript. OutputStream must be set */
    public static final int RENDER_PS = 7;

    /** Render to Text. OutputStream must be set */
    public static final int RENDER_TXT = 8;

    /** the FO tree builder */
    private FOTreeBuilder _treeBuilder;

    /** the area tree that is the result of formatting the FO tree */
    private AreaTree _areaTree;

    /** the renderer to use to output the area tree */
    private Renderer _renderer;

    /** the source of the FO file */
    private InputSource _source;

    /** the stream to use to output the results of the renderer */
    private OutputStream _stream;

    /** The XML parser to use when building the FO tree */
    private XMLReader _reader;

    /** If true, full error stacks are reported */
    private boolean _errorDump = false;

    /** the system resources that FOP will use    */
    private BufferManager _bufferManager;

    /** create a new Driver */
    public Driver() {
        _stream = null;
        _bufferManager = new BufferManager();
        _treeBuilder = new FOTreeBuilder();
        _treeBuilder.setBufferManager(_bufferManager);
        setupDefaultMappings();
    }

    public Driver(InputSource source, OutputStream stream) {
        this();
        _source = source;
        _stream = stream;
    }

    /**
     * Resets the Driver so it can be reused. Property and element
     * mappings are reset to defaults.
     * The output stream is cleared. The renderer is cleared.
     */
    public synchronized void reset() {
        _areaTree = null;
        _treeBuilder.reset();
    }

    public boolean hasData() {
        return(_treeBuilder.hasData());
    }

    /**
     * Set the error dump option
     * @param dump if true, full stacks will be reported to the error log
     */
    public void setErrorDump(boolean dump) {
        _errorDump = dump;
    }

    /**
     * Set the OutputStream to use to output the result of the Renderer
     * (if applicable)
     * @param stream the stream to output the result of rendering to
     *
     */
    public void setOutputStream(OutputStream stream) {
        _stream = stream;
    }

    /**
     * Set the source for the FO document. This can be a normal SAX
     * InputSource, or an DocumentInputSource containing a DOM document.
     * @see DocumentInputSource
     */
    public void setInputSource(InputSource source) {
        _source = source;
    }

    /**
     * Sets the reader used when reading in the source. If not set,
     * this defaults to a basic SAX parser.
     */
    public void setXMLReader(XMLReader reader) {
        _reader = reader;
    }


    /**
     * Sets all the element and property list mappings to their default values.
     *
     */
    public void setupDefaultMappings() {
        addElementMapping("org.apache.fop.fo.StandardElementMapping");
        addPropertyList ("org.apache.fop.fo.StandardPropertyListMapping");

        addElementMapping("org.apache.fop.svg.SVGElementMapping");
        addPropertyList ("org.apache.fop.svg.SVGPropertyListMapping");

        addElementMapping("org.apache.fop.extensions.ExtensionElementMapping");
        addPropertyList ("org.apache.fop.extensions.ExtensionPropertyListMapping");
    }

    /**
     * Set the rendering type to use. Must be one of
     * <ul>
     *   <li>RENDER_PDF
     *   <li>RENDER_AWT
     *   <li>RENDER_MIF
     *   <li>RENDER_XML
     *   <li>RENDER_PCL
     *   <li>RENDER_PS
     *   <li>RENDER_TXT
     * </ul>
     * @param renderer the type of renderer to use
     */
    public void setRenderer(int renderer) throws IllegalArgumentException {
        switch (renderer) {
            case RENDER_PDF:
                setRenderer(new org.apache.fop.render.pdf.PDFRenderer());
                break;
            case RENDER_AWT:
                throw new IllegalArgumentException("Use renderer form of setRenderer() for AWT");
            case RENDER_PRINT:
                throw new IllegalArgumentException("Use renderer form of setRenderer() for PRINT");
            case RENDER_PCL:
                setRenderer(new org.apache.fop.render.pcl.PCLRenderer());
                break;
            case RENDER_PS:
                setRenderer(new org.apache.fop.render.ps.PSRenderer());
                break;
            case RENDER_TXT:
                setRenderer(new org.apache.fop.render.txt.TXTRenderer());
                break;
            case RENDER_MIF:
                setRenderer(new org.apache.fop.render.mif.MIFRenderer());
                break;
            case RENDER_XML:
                setRenderer(new org.apache.fop.render.xml.XMLRenderer());
                break;
            default:
                throw new IllegalArgumentException("Unknown renderer type");
        }

    }


    /**
     * Set the Renderer to use
     * @param renderer the renderer instance to use
     */
    public void setRenderer(Renderer renderer) {
        _renderer = renderer;
    }

    public Renderer getRenderer() {
        return _renderer;
    }

    /**
     * @deprecated use renderer.setProducer(version) + setRenderer(renderer) or just setRenderer(renderer_type) which will use the default producer string.
     * @see #setRenderer(int)
     * @see #setRenderer(Renderer)
     */
    public void setRenderer(String rendererClassName, String version) {
        setRenderer(rendererClassName);
    }

    /**
     * Set the class name of the Renderer to use as well as the
     * producer string for those renderers that can make use of it.
     * @param rendererClassName classname of the renderer to use such as
     * "org.apache.fop.render.pdf.PDFRenderer"
     * @exception IllegalArgumentException if the classname was invalid.
     * @see #setRenderer(int)
     */
    public void setRenderer(String rendererClassName)
    throws IllegalArgumentException {
        try {
            _renderer = (Renderer) Class.forName(
                          rendererClassName).newInstance();
            _renderer.setProducer(Version.getVersion());
        } catch (ClassNotFoundException e) {
            throw new IllegalArgumentException("Could not find " +
                                               rendererClassName);
        }
        catch (InstantiationException e) {
            throw new IllegalArgumentException(
              "Could not instantiate " + rendererClassName);
        }
        catch (IllegalAccessException e) {
            throw new IllegalArgumentException("Could not access " +
                                               rendererClassName);
        }
        catch (ClassCastException e) {
            throw new IllegalArgumentException(rendererClassName + " is not a renderer");
        }
    }

    /**
     * Add the given element mapping.
     * An element mapping maps element names to Java classes.
     *
     * @param mapping the element mappingto add
     */
    public void addElementMapping(ElementMapping mapping) {
        mapping.addToBuilder(_treeBuilder);
    }

    /**
     * add the element mapping with the given class name
     */
    public void addElementMapping(String mappingClassName)
    throws IllegalArgumentException {
        try {
            ElementMapping mapping = (ElementMapping) Class.forName(
                                       mappingClassName).newInstance();
            addElementMapping(mapping);
        } catch (ClassNotFoundException e) {
            throw new IllegalArgumentException("Could not find " +
                                               mappingClassName);
        }
        catch (InstantiationException e) {
            throw new IllegalArgumentException(
              "Could not instantiate " + mappingClassName);
        }
        catch (IllegalAccessException e) {
            throw new IllegalArgumentException("Could not access " +
                                               mappingClassName);
        }
        catch (ClassCastException e) {
            throw new IllegalArgumentException(mappingClassName + " is not an ElementMapping");
        }
    }

    /**
     * Add the PropertyListMapping.
     */
    public void addPropertyList(PropertyListMapping mapping) {
        mapping.addToBuilder(_treeBuilder);
    }

    /**
     * Add the PropertyListMapping with the given class name.
     */
    public void addPropertyList(String listClassName)
    throws IllegalArgumentException {
        try {
            PropertyListMapping mapping =
              (PropertyListMapping) Class.forName(
                listClassName).newInstance();
            addPropertyList(mapping);

        } catch (ClassNotFoundException e) {
            throw new IllegalArgumentException("Could not find " +
                                               listClassName);
        }
        catch (InstantiationException e) {
            throw new IllegalArgumentException(
              "Could not instantiate " + listClassName);
        }
        catch (IllegalAccessException e) {
            throw new IllegalArgumentException("Could not access " +
                                               listClassName);
        }
        catch (ClassCastException e) {
            throw new IllegalArgumentException(listClassName + " is not an ElementMapping");
        }
    }

    /**
     * Returns the tree builder (a SAX ContentHandler).
     *
     * Used in situations where SAX is used but not via a FOP-invoked
     * SAX parser. A good example is an XSLT engine that fires SAX
     * events but isn't a SAX Parser itself.
     */
    public ContentHandler getContentHandler() {
        return _treeBuilder;
    }

    /**
     * Build the formatting object tree using the given SAX Parser and
     * SAX InputSource
     */
    public synchronized void buildFOTree(XMLReader parser,
                                         InputSource source)
        throws FOPException {

        parser.setContentHandler(_treeBuilder);
        try {
            parser.parse(source);
        } catch (SAXException e) {
            if (e.getException() instanceof FOPException) {
                throw (FOPException) e.getException();
            } else {
                throw new FOPException(e);
            }
        }
        catch (IOException e) {
            throw new FOPException(e);
        }
    }

    /**
     * Build the formatting object tree using the given DOM Document
     */
    public synchronized void buildFOTree(Document document)
        throws FOPException {
        try {
            DocumentInputSource source = new DocumentInputSource(document);
            DocumentReader reader = new DocumentReader();
            reader.setContentHandler(_treeBuilder);
            reader.parse(source);
        } catch (SAXException e) {
            throw new FOPException(e);
        }
        catch (IOException e) {
            throw new FOPException(e);
        }

    }

    /**
     * Dumps an error
     */
    public void dumpError(Exception e) {
        if (_errorDump) {
            if (e instanceof SAXException) {
                e.printStackTrace();
                if (((SAXException) e).getException() != null) {
                    ((SAXException) e).getException().printStackTrace();
                }
            } else if (e instanceof FOPException) {
                e.printStackTrace();
                if (((FOPException) e).getException() != null) {
                    ((FOPException) e).getException().printStackTrace();
                }
            } else {
                e.printStackTrace();
            }
        }
    }

    /* Set up the system buffers */

    public void setBufferFile(File bufferFile) {
        this._bufferManager.addBufferFile(bufferFile);
    }

    /**
     * format the formatting object tree into an area tree
     */
    public synchronized void format()
        throws FOPException {
        FontInfo fontInfo = new FontInfo();
        _renderer.setupFontInfo(fontInfo);

        _areaTree = new AreaTree();
        _areaTree.setFontInfo(fontInfo);

        _treeBuilder.format(_areaTree);
    }

    /**
     * render the area tree to the output form
     */
    public synchronized void render()
        throws IOException, FOPException {
        _renderer.render(_areaTree, _stream);
    }

    /**
     * Runs the formatting and renderering process using the previously set
     * inputsource and outputstream
     */
    public synchronized void run()
        throws IOException, FOPException {
        if (_renderer == null) {
            setRenderer(RENDER_PDF);
        }
        if (_source == null) {
            throw new FOPException("InputSource is not set.");
        }
        if (_reader == null) {
            if (!(_source instanceof DocumentInputSource)) {
                _reader = ConfigurationReader.createParser();
            }
        }
        if (_source instanceof DocumentInputSource) {
            buildFOTree(((DocumentInputSource)_source).getDocument());
        } else {
            buildFOTree(_reader, _source);
        }
        format();
        render();
    }

}