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/* The contents of this file are subject to the license and copyright terms
 * detailed in the license directory at the root of the source tree (also 
 * available online at http://fedora-commons.org/license/).
 */
package org.fcrepo.client.objecteditor;

import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.StringReader;

import javax.swing.JComponent;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.text.JTextComponent;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import com.sun.org.apache.xml.internal.serialize.OutputFormat;
import com.sun.org.apache.xml.internal.serialize.XMLSerializer;

import org.w3c.dom.Document;

import org.xml.sax.InputSource;

/**
 * A general-purpose text editor/viewer with XML pretty-printing.
 */
public class TextContentEditor
        extends ContentEditor
        implements DocumentListener {

    /** This class handles all the common text MIME types by default. */
    public static String[] s_types =
            new String[] {"text/xml", "text/plain", "text/html", "text/css",
                    "text/html", "text/sgml", "text/tab-separated-values",
                    "text/xml-external-parsed-entity", "application/xml"};

    protected boolean m_dirty;

    protected ActionListener m_dataChangeListener;

    protected JTextComponent m_editor;

    protected JScrollPane m_component;

    protected boolean m_xml = false;

    protected String m_origContent;

    private static boolean s_registered = false;

    public TextContentEditor() {
        if (!s_registered) {
            ContentHandlerFactory.register(this);
            s_registered = true;
        }
    }

    @Override
    public String[] getTypes() {
        return s_types;
    }

    @Override
    public void init(String type, InputStream data, boolean viewOnly)
            throws IOException {
        if (type.endsWith("xml")) {
            m_xml = true;
        }
        m_editor = new JTextArea();
        m_editor.setFont(new Font("monospaced", Font.PLAIN, 12));
        setContent(data);
        m_editor.setEditable(!viewOnly);
        m_component = new JScrollPane(m_editor);
    }

    public void setXML(boolean isXML) {
        m_xml = isXML;
    }

    @Override
    public void setContent(InputStream data) throws IOException {
        // get a string from the inputstream, assume it's UTF-8
        String content;
        if (m_xml) {
            try {
                // use xerces to pretty print the xml to the editor
                OutputFormat fmt = new OutputFormat("XML", "UTF-8", true);
                fmt.setOmitXMLDeclaration(true);
                fmt.setIndent(2);
                fmt.setLineWidth(120);
                fmt.setPreserveSpace(false);
                ByteArrayOutputStream buf = new ByteArrayOutputStream();
                XMLSerializer ser = new XMLSerializer(buf, fmt);
                DocumentBuilderFactory factory =
                        DocumentBuilderFactory.newInstance();
                factory.setNamespaceAware(true);
                DocumentBuilder builder = factory.newDocumentBuilder();
                Document doc = builder.parse(data);
                ser.serialize(doc);
                content = new String(buf.toByteArray(), "UTF-8");
            } catch (Exception e) {
                throw new IOException("Error parsing as XML: " + e.getMessage());
            }
        } else {
            StringBuffer out = new StringBuffer();
            BufferedReader in = new BufferedReader(new InputStreamReader(data));
            String thisLine;
            while ((thisLine = in.readLine()) != null) {
                out.append(thisLine + "\n");
            }
            in.close();
            content = out.toString();
        }
        m_editor.setText(content);
        m_editor.setCaretPosition(0);
        // if this is being called upon construction, set it to the original
        // content.  else, let it be different.
        if (m_origContent == null) {
            m_origContent = content;
        }
    }

    @Override
    public JComponent getComponent() {
        return m_component;
    }

    @Override
    public void changesSaved() {
        m_origContent = m_editor.getText();
        dataChanged();
    }

    @Override
    public void undoChanges() {
        m_editor.setText(m_origContent);
        m_editor.setCaretPosition(0);
        dataChanged();
    }

    @Override
    public boolean isDirty() {
        return !m_origContent.equals(m_editor.getText());
    }

    @Override
    public void setContentChangeListener(ActionListener listener) {
        m_dataChangeListener = listener;
        m_editor.getDocument().addDocumentListener(this);
    }

    @Override
    public InputStream getContent() throws IOException {
        try {
            if (m_xml) {
                // if it's xml, throw an exception if it's not well-formed
                DocumentBuilderFactory factory =
                        DocumentBuilderFactory.newInstance();
                DocumentBuilder builder = factory.newDocumentBuilder();
                Document doc =
                        builder.parse(new InputSource(new StringReader(m_editor
                                .getText())));
            }
            return new ByteArrayInputStream(m_editor.getText()
                    .getBytes("UTF-8"));
        } catch (Exception e) {
            throw new IOException(e.getMessage());
        }
    }

    // Forward DocumentListener's events to the passed-in ActionListener
    public void changedUpdate(DocumentEvent e) {
        dataChanged();
    }

    public void insertUpdate(DocumentEvent e) {
        dataChanged();
    }

    public void removeUpdate(DocumentEvent e) {
        dataChanged();
    }

    private void dataChanged() {
        if (m_dataChangeListener != null) {
            m_dataChangeListener
                    .actionPerformed(new ActionEvent(this, 0, "dataChanged"));
        }
    }

}