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/*******************************************************************************
 * Copyright (c) 2000, 2006 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *     Sebastian Davids: [email protected] - see bug 25376
 *******************************************************************************/
package org.eclipse.jface.text.templates;

import com.ibm.icu.text.DateFormat;
import com.ibm.icu.util.Calendar;

/**
 * Global variables which are available in any context.
 * 
 * Clients may instantiate the classes contained within this class.
 * 
 *
 * @since 3.0
 */
public class GlobalTemplateVariables {

	/** The type of the selection variables. */
	public static final String SELECTION= "selection"; //$NON-NLS-1$

	/**
	 * The cursor variable determines the cursor placement after template edition.
	 */
	public static class Cursor extends SimpleTemplateVariableResolver {

		/** Name of the cursor variable, value= {@value} */
		public static final String NAME= "cursor"; //$NON-NLS-1$

		/**
		 * Creates a new cursor variable
		 */
		public Cursor() {
			super(NAME, TextTemplateMessages.getString("GlobalVariables.variable.description.cursor")); //$NON-NLS-1$
			setEvaluationString(""); //$NON-NLS-1$
		}
	}

	/**
	 * The word selection variable determines templates that work on a full
	 * lines selection.
	 */
	public static class WordSelection extends SimpleTemplateVariableResolver {

		/** Name of the word selection variable, value= {@value} */
		public static final String NAME= "word_selection"; //$NON-NLS-1$

		/**
		 * Creates a new word selection variable
		 */
		public WordSelection() {
			super(NAME, TextTemplateMessages.getString("GlobalVariables.variable.description.selectedWord")); //$NON-NLS-1$
		}
		protected String resolve(TemplateContext context) {
			String selection= context.getVariable(SELECTION);
			if (selection == null)
				return ""; //$NON-NLS-1$
			return selection;
		}
	}

	/**
	 * The line selection variable determines templates that work on selected
	 * lines.
	 */
	public static class LineSelection extends SimpleTemplateVariableResolver {

		/** Name of the line selection variable, value= {@value} */
		public static final String NAME= "line_selection"; //$NON-NLS-1$

		/**
		 * Creates a new line selection variable
		 */
		public LineSelection() {
			super(NAME, TextTemplateMessages.getString("GlobalVariables.variable.description.selectedLines")); //$NON-NLS-1$
		}
		protected String resolve(TemplateContext context) {
			String selection= context.getVariable(SELECTION);
			if (selection == null)
				return ""; //$NON-NLS-1$
			return selection;
		}
	}

	/**
	 * The dollar variable inserts an escaped dollar symbol.
	 */
	public static class Dollar extends SimpleTemplateVariableResolver {
		/**
		 * Creates a new dollar variable
		 */
		public Dollar() {
			super("dollar", TextTemplateMessages.getString("GlobalVariables.variable.description.dollar")); //$NON-NLS-1$ //$NON-NLS-2$
			setEvaluationString("$"); //$NON-NLS-1$
		}
	}

	/**
	 * The date variable evaluates to the current date.
	 */
	public static class Date extends SimpleTemplateVariableResolver {
		/**
		 * Creates a new date variable
		 */
		public Date() {
			super("date", TextTemplateMessages.getString("GlobalVariables.variable.description.date")); //$NON-NLS-1$ //$NON-NLS-2$
		}
		protected String resolve(TemplateContext context) {
			return DateFormat.getDateInstance().format(new java.util.Date());
		}
	}

	/**
	 * The year variable evaluates to the current year.
	 */
	public static class Year extends SimpleTemplateVariableResolver {
		/**
		 * Creates a new year variable
		 */
		public Year() {
			super("year", TextTemplateMessages.getString("GlobalVariables.variable.description.year")); //$NON-NLS-1$ //$NON-NLS-2$
		}
		protected String resolve(TemplateContext context) {
			return Integer.toString(Calendar.getInstance().get(Calendar.YEAR));
		}
	}

	/**
	 * The time variable evaluates to the current time.
	 */
	public static class Time extends SimpleTemplateVariableResolver {
		/**
		 * Creates a new time variable
		 */
		public Time() {
			super("time", TextTemplateMessages.getString("GlobalVariables.variable.description.time")); //$NON-NLS-1$ //$NON-NLS-2$
		}

		/**
		 * {@inheritDoc}
		 */
		protected String resolve(TemplateContext context) {
			return DateFormat.getTimeInstance().format(new java.util.Date());
		}
	}

	/**
	 * The user variable evaluates to the current user.
	 */
	public static class User extends SimpleTemplateVariableResolver {
		/**
		 * Creates a new user name variable
		 */
		public User() {
			super("user", TextTemplateMessages.getString("GlobalVariables.variable.description.user")); //$NON-NLS-1$ //$NON-NLS-2$
		}

		/**
		 * {@inheritDoc}
		 */
		protected String resolve(TemplateContext context) {
			return System.getProperty("user.name"); //$NON-NLS-1$
		}
	}
}