/*

* Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies). 

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:

*

*/

package com.nokia.s60tools.crashanalyser.model;

import javax.xml.parsers.SAXParser;

import javax.xml.parsers.SAXParserFactory;

import javax.xml.validation.SchemaFactory;

import javax.xml.XMLConstants;

import org.xml.sax.Attributes;

import org.xml.sax.SAXException;

import org.xml.sax.helpers.DefaultHandler;

import java.util.*;

import java.io.File;

import java.io.FilenameFilter;

import java.util.ArrayList;

import com.nokia.s60tools.crashanalyser.containers.ErrorLibraryError;

import com.nokia.s60tools.crashanalyser.plugin.*;

/**

 * This class reads all error xml files with SAX parser.  

 *

 */

public class ErrorsXmlReader extends DefaultHandler {

	Map<String, ErrorLibraryError> errors = null;

	Map<String, ErrorLibraryError> panics = null;

	Map<String, ErrorLibraryError> categories = null;

	ErrorLibraryError error = null;

	ErrorLibraryError error2 = null;

	ErrorLibraryError panic = null;

	ErrorLibraryError category = null;

	String nodeText = "";

	String categoryDescription = "";

	String categoryKey = "";

	String panicKey = "";

	String errorKey1 = "";

	String errorKey2 = "";

	String errorComponent = "";

	static final String TAG_CATEGORY_NAME = "category_name";

	static final String TAG_CATEGORY_DESCRIPTION = "category_description";

	static final String TAG_PANIC_ID = "panic_id";

	static final String TAG_PANIC_DESCRIPTION = "panic_description";

	static final String TAG_PANIC_CATEGORY = "panic_category";

	static final String TAG_ERROR_NAME = "error_name";

	static final String TAG_ERROR_VALUE = "error_value";

	static final String TAG_ERROR_TEXT = "error_text";

	static final String TAG_ERROR_COMPONENT = "error_component";

	/**

	 * Returns list of errors and gives up the ownership of the list.

	 * @return list of errors

	 */

	public Map<String, ErrorLibraryError> getErrorsOwnership() {

		if (errors == null || errors.isEmpty()) {

			return null;

		} else {

			Map<String, ErrorLibraryError> err = errors; 

			errors = null;

			return err;

		}

	}

	/**

	 * Returns list of panics and gives up the ownership of the list.

	 * @return list of panics

	 */

	public Map<String, ErrorLibraryError> getPanicsOwnership() {

		if (panics == null || panics.isEmpty()) {

			return null;

		} else {

			Map<String, ErrorLibraryError> pan = panics;

			panics = null;

			return pan;

		}

	}

	/**

	 * Returns list of panic categories and gives up the ownership of the list.

	 * @return list of panic categories

	 */

	public Map<String, ErrorLibraryError> getCategoriesOwnership() {

		if (categories == null || categories.isEmpty()) {

			return null;

		} else {

			Map<String, ErrorLibraryError> cat = categories;

			categories = null;

			return cat;

		}

	}

	/**

	 * Reads all error xml files

	 */

	public void readAll() {

		try {

			errors = null;

			panics = null;

			categories = null;

			String dataPath = CrashAnalyserPlugin.getDataPath();

			SchemaFactory sf = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);

			SAXParserFactory spf = SAXParserFactory.newInstance();

			spf.setSchema(sf.newSchema(new File(dataPath + "schema.xsd")));

			spf.setValidating(true);

			SAXParser sp = spf.newSAXParser();

			List<String> xmlFiles = getXmlFiles(dataPath);

			if (xmlFiles == null || xmlFiles.isEmpty())

				return;

			for (int i = 0; i < xmlFiles.size(); i++) {

				try {

					// parse the file and also register this class for call backs

					sp.parse(new File(xmlFiles.get(i)), this);

				} catch (Exception ex) {

					ex.printStackTrace();

				}

			}

		}catch(Exception e) {

			e.printStackTrace();

		}

	}

	@Override

	public void startDocument() throws SAXException {

		if (errors == null)

			errors = new HashMap<String, ErrorLibraryError>();

		if (panics == null)

			panics = new HashMap<String, ErrorLibraryError>();

		if (categories == null)

			categories = new HashMap<String, ErrorLibraryError>();

		super.startDocument();

	}

	@Override

	public void startElement(String arg0, String arg1, String arg2,	Attributes arg3) 

			throws SAXException {

		nodeText = "";

		super.startElement(arg0, arg1, arg2, arg3);

	}

	@Override

	public void characters(char[] arg0, int arg1, int arg2) throws SAXException {

		String s = String.copyValueOf(arg0, arg1, arg2);

		nodeText += s;

		super.characters(arg0, arg1, arg2);

	}	

	@Override

	public void endElement(String arg0, String arg1, String arg2)

			throws SAXException {

		if (TAG_CATEGORY_NAME.equals(arg2)) {

			category = new ErrorLibraryError();

			category.SetName(nodeText);

			categoryKey = nodeText;

		} else if (TAG_CATEGORY_DESCRIPTION.equals(arg2)) {

			categoryDescription = HtmlFormatter.formatCategoryDescription(category.toString(), nodeText);

			category.SetDescription(categoryDescription);

		} else if (TAG_PANIC_ID.equals(arg2)) {

			category.AddToDescription(HtmlFormatter.formatPanicName(category.toString(), nodeText));

			panic = new ErrorLibraryError();

			panic.SetName(category.toString() + " " + nodeText);

			panicKey = categoryKey + nodeText;

		} else if (TAG_PANIC_DESCRIPTION.equals(arg2)) {

			category.AddToDescription(nodeText);

			panic.SetDescription(HtmlFormatter.formatPanicDescription(panic.toString(), nodeText));

			panic.AddToDescription(categoryDescription);

			panics.put(panicKey, panic);

			panic = null;

			panicKey = "";

		} else if (TAG_PANIC_CATEGORY.equals(arg2)) {

			categories.put(categoryKey, category);

			category = null;

			categoryKey = "";

		} else if (TAG_ERROR_NAME.equals(arg2)) {

			error = new ErrorLibraryError();

			error.SetName(nodeText);

			errorKey1 = nodeText;

		} else if (TAG_ERROR_VALUE.equals(arg2)) {

			error.SetDescription(HtmlFormatter.formatErrorDescription(error.toString(), nodeText));

			error2 = new ErrorLibraryError();

			error2.SetName(nodeText);

			error2.SetDescription(HtmlFormatter.formatErrorDescription(nodeText, error.toString()));

			errorKey2 = nodeText;

		} else if (TAG_ERROR_COMPONENT.equals(arg2)) {

			errorComponent = nodeText;

		} else if (TAG_ERROR_TEXT.equals(arg2)) {

			error.AddToDescription(nodeText);

			error.AddToDescription(HtmlFormatter.formatErrorComponent(errorComponent));

			error2.AddToDescription(nodeText);

			error2.AddToDescription(HtmlFormatter.formatErrorComponent(errorComponent));

			errors.put(errorKey1, error);

			error = null;

			errorKey1 = "";

			errors.put(errorKey2, error2);

			error2 = null;

			errorKey2 = "";

		}

		super.endElement(arg0, arg1, arg2);

	}

	/**

	 * Returns a list of all error xml files 

	 * @param path xml files path

	 * @return a list of all error xml files

	 */

	List<String> getXmlFiles(String path) {

		try {

			List<String> xmlFiles = new ArrayList<String>();

			File file = new File(path);

			FilenameFilter filter = new FilenameFilter() {

				public boolean accept(File dir, String name) {

					return (name.endsWith("xml"));

				}

			};

			File[] files = file.listFiles(filter);

			for (int i = 0; i < files.length; i++) {

				xmlFiles.add(files[i].getAbsolutePath());

			}

			if (xmlFiles.isEmpty())

				return null;

			return xmlFiles;

		} catch (Exception e) {

			e.printStackTrace();

			return null;

		}

	}	

}