/*******************************************************************************
 * Copyright (c) 2003 Berthold Daum.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     Berthold Daum
 *******************************************************************************/

package net.sourceforge.phpeclipse.wiki.preferences;

import java.io.IOException;
import java.io.OutputStream;

import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.QualifiedName;
import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.jface.preference.PreferenceStore;

/**
 * @author Berthold Daum
 *
 */
public class PropertyStore extends PreferenceStore {

	private IResource resource;
	private IPreferenceStore workbenchStore;
	private String pageId;
	private boolean inserting = false;

	public PropertyStore(
		IResource resource,
		IPreferenceStore workbenchStore,
		String pageId) {
		this.resource = resource;
		this.workbenchStore = workbenchStore;
		this.pageId = pageId;
	}

	/*** Write modified values back to properties ***/

	/* (non-Javadoc)
	 * @see org.eclipse.jface.preference.IPersistentPreferenceStore#save()
	 */
	public void save() throws IOException {
		writeProperties();
	}

	/* (non-Javadoc)
	 * @see org.eclipse.jface.preference.PreferenceStore#save(java.io.OutputStream, java.lang.String)
	 */
	public void save(OutputStream out, String header) throws IOException {
		writeProperties();
	}

	/**
	 * Writes modified preferences into resource properties.
	 */
	private void writeProperties() throws IOException {
		String[] preferences = super.preferenceNames();
		for (int i = 0; i < preferences.length; i++) {
			String name = preferences[i];
			try {
				setProperty(name, getString(name));
			} catch (CoreException e) {
				throw new IOException(Messages.getString("PropertyStore.Cannot_write_resource_property") + name); //$NON-NLS-1$
			}
		}
	}

	/**
	 * Convenience method to set a property
	 * @param name - the preference name
	 * @param value - the property value or null to delete the property
	 * @throws CoreException
	 */
	private void setProperty(String name, String value) throws CoreException {
		resource.setPersistentProperty(new QualifiedName(pageId, name), value);
	}

	/*** Get default values (Delegate to workbench store) ***/

	/* (non-Javadoc)
	 * @see org.eclipse.jface.preference.IPreferenceStore#getDefaultBoolean(java.lang.String)
	 */
	public boolean getDefaultBoolean(String name) {
		return workbenchStore.getDefaultBoolean(name);
	}

	/* (non-Javadoc)
	 * @see org.eclipse.jface.preference.IPreferenceStore#getDefaultDouble(java.lang.String)
	 */
	public double getDefaultDouble(String name) {
		return workbenchStore.getDefaultDouble(name);
	}

	/* (non-Javadoc)
	 * @see org.eclipse.jface.preference.IPreferenceStore#getDefaultFloat(java.lang.String)
	 */
	public float getDefaultFloat(String name) {
		return workbenchStore.getDefaultFloat(name);
	}

	/* (non-Javadoc)
	 * @see org.eclipse.jface.preference.IPreferenceStore#getDefaultInt(java.lang.String)
	 */
	public int getDefaultInt(String name) {
		return workbenchStore.getDefaultInt(name);
	}

	/* (non-Javadoc)
	 * @see org.eclipse.jface.preference.IPreferenceStore#getDefaultLong(java.lang.String)
	 */
	public long getDefaultLong(String name) {
		return workbenchStore.getDefaultLong(name);
	}

	/* (non-Javadoc)
	 * @see org.eclipse.jface.preference.IPreferenceStore#getDefaultString(java.lang.String)
	 */
	public String getDefaultString(String name) {
		return workbenchStore.getDefaultString(name);
	}

	/*** Get property values ***/

	/* (non-Javadoc)
	 * @see org.eclipse.jface.preference.IPreferenceStore#getBoolean(java.lang.String)
	 */
	public boolean getBoolean(String name) {
		insertValue(name);
		return super.getBoolean(name);
	}

	/* (non-Javadoc)
	 * @see org.eclipse.jface.preference.IPreferenceStore#getDouble(java.lang.String)
	 */
	public double getDouble(String name) {
		insertValue(name);
		return super.getDouble(name);
	}

	/* (non-Javadoc)
	 * @see org.eclipse.jface.preference.IPreferenceStore#getFloat(java.lang.String)
	 */
	public float getFloat(String name) {
		insertValue(name);
		return super.getFloat(name);
	}

	/* (non-Javadoc)
	 * @see org.eclipse.jface.preference.IPreferenceStore#getInt(java.lang.String)
	 */
	public int getInt(String name) {
		insertValue(name);
		return super.getInt(name);
	}

	/* (non-Javadoc)
	 * @see org.eclipse.jface.preference.IPreferenceStore#getLong(java.lang.String)
	 */
	public long getLong(String name) {
		insertValue(name);
		return super.getLong(name);
	}

	/* (non-Javadoc)
	 * @see org.eclipse.jface.preference.IPreferenceStore#getString(java.lang.String)
	 */
	public String getString(String name) {
		insertValue(name);
		return super.getString(name);
	}

	/**
	 * @param name
	 */
	private synchronized void insertValue(String name) {
		if (inserting)
			return;
		if (super.contains(name))
			return;
		inserting = true;
		String prop = null;
		try {
			prop = getProperty(name);
		} catch (CoreException e) {
		}
		if (prop == null)
			prop = workbenchStore.getString(name);
		if (prop != null)
			setValue(name, prop);
		inserting = false;
	}

	/**
	 * Convenience method to fetch a property
	 * @param name - the preference name
	 * @return - the property value
	 * @throws CoreException
	 */
	private String getProperty(String name) throws CoreException {
		return resource.getPersistentProperty(new QualifiedName(pageId, name));
	}

	/*** Misc ***/

	/* (non-Javadoc)
	 * @see org.eclipse.jface.preference.IPreferenceStore#contains(java.lang.String)
	 */
	public boolean contains(String name) {
		return workbenchStore.contains(name);
	}

	/* (non-Javadoc)
	 * @see org.eclipse.jface.preference.IPreferenceStore#setToDefault(java.lang.String)
	 */
	public void setToDefault(String name) {
			setValue(name, getDefaultString(name));
	}

	/* (non-Javadoc)
	 * @see org.eclipse.jface.preference.IPreferenceStore#isDefault(java.lang.String)
	 */
	public boolean isDefault(String name) {
		String defaultValue = getDefaultString(name);
		if (defaultValue == null) return false;
		return defaultValue.equals(getString(name));
	}

}