/*****************************************************/
/*          This java file is a part of the          */
/*                                                   */
/*           -  Plouf's Java IRC Client  -           */
/*                                                   */
/*   Copyright (C)  2002 - 2004 Philippe Detournay   */
/*                                                   */
/*         All contacts : theplouf@yahoo.com         */
/*                                                   */
/*  PJIRC is free software; you can redistribute     */
/*  it and/or modify it under the terms of the GNU   */
/*  General Public License as published by the       */
/*  Free Software Foundation; version 2 or later of  */
/*  the License.                                     */
/*                                                   */
/*  PJIRC is distributed in the hope that it will    */
/*  be useful, but WITHOUT ANY WARRANTY; without     */
/*  even the implied warranty of MERCHANTABILITY or  */
/*  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU   */
/*  General Public License for more details.         */
/*                                                   */
/*  You should have received a copy of the GNU       */
/*  General Public License along with PJIRC; if      */
/*  not, write to the Free Software Foundation,      */
/*  Inc., 59 Temple Place, Suite 330, Boston,        */
/*  MA  02111-1307  USA                              */
/*                                                   */
/*****************************************************/

package irc;

/**
 * Combined IRC mode handler.
 */
public class MultiModeHandler {
	private String[] _parameters;
	private char[][] _modes;
	private char[] _prefix;
	private int _paramIndex;
	private int _codeIndex;
	private boolean _positive;

	private String _currentMode;
	private char _currentModeChar;
	private boolean _currentHasParameter;
	private String _currentParameter;
	private boolean _currentPrefix;

	/**
	 * Create a new ModeHandler with empty mode.
	 * 
	 * @param code
	 *          initial code.
	 * @param modes
	 *          A,B,C,D know modes. This is an array of four arrays of chars.
	 * @param prefix
	 *          prefix modes.
	 */
	public MultiModeHandler(String code, char[][] modes, char prefix[]) {
		_modes = modes;
		_prefix = prefix;
		_parameters = (new StringParser()).parseString(code);
		_paramIndex = 1;
		_codeIndex = 0;
		_positive = true;
	}

	/**
	 * Check whether there is more modes to handle.
	 * 
	 * @return true if there is more modes to handle, false otherwise.
	 */
	public boolean terminated() {
		return (_codeIndex == _parameters[0].length());
	}

	/**
	 * Handle the next mode. This method must be called before first call to any
	 * other getter's method.
	 */
	public void next() {
		if (terminated())
			return;
		char c = _parameters[0].charAt(_codeIndex++);
		if (c == '-') {
			_positive = false;
			next();
			return;
		}
		if (c == '+') {
			_positive = true;
			next();
			return;
		}
		_currentMode = "-";
		if (_positive)
			_currentMode = "+";
		_currentMode += c;
		_currentModeChar = c;
		if (hasParameter(_positive, c) && _paramIndex < _parameters.length) {
			_currentHasParameter = true;
			_currentParameter = _parameters[_paramIndex++];
		} else {
			_currentHasParameter = false;
			_currentParameter = "";
		}
		_currentPrefix = inside(_prefix, c);
	}

	private boolean inside(char[] list, char c) {
		for (int i = 0; i < list.length; i++)
			if (list[i] == c)
				return true;
		return false;
	}

	/**
	 * Get current mode to handle.
	 * 
	 * @return mode.
	 */
	public String getMode() {
		return _currentMode;
	}

	/**
	 * Check whether the current mode has a parameter.
	 * 
	 * @return true if the mode has a parameter, false otherwise.
	 */
	public boolean hasParameter() {
		return _currentHasParameter;
	}

	/**
	 * Get the current parameter, if defined.
	 * 
	 * @return the current parameter, if defined.
	 */
	public String getParameter() {
		return _currentParameter;
	}

	/**
	 * Check wether the current mode comes from the prefix list instead of the
	 * A,B,C,D list.
	 * 
	 * @return true if the mode is a prefix mode.
	 */
	public boolean isPrefix() {
		return _currentPrefix;
	}

	/**
	 * Check wether the current mode comes from the A list.
	 * 
	 * @return true if the mode is a A code.
	 */
	public boolean isModeA() {
		return inside(_modes[0], _currentModeChar);
	}

	private boolean hasParameter(boolean positive, char c) {
		if (inside(_prefix, c))
			return true;
		else if (inside(_modes[0], c))
			return true;
		else if (inside(_modes[1], c))
			return true;
		else if (inside(_modes[2], c))
			return positive;
		else
			return false;
	}
}