/*
 * JFugue - API for Music Programming
 * Copyright (C) 2003-2008  David Koelle
 *
 * http://www.jfugue.org
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

package org.jfugue;

/**
 * A IntervalNotation is a MusicString that only contains interval information
 * and durations, not actual notes. A riff is converted into an actual
 * MusicString by applying a root note.
 *
 * @author David Koelle
 * @version 4.0
 */
public class IntervalNotation {
	private String musicStringWithIntervals;

	public IntervalNotation(String musicStringWithIntervals) {
		setMusicStringWithIntervals(musicStringWithIntervals);
	}

	public void setMusicStringWithIntervals(String musicStringWithIntervals) {
		this.musicStringWithIntervals = musicStringWithIntervals;
	}

	public String getMusicStringWithIntervals() {
		return this.musicStringWithIntervals;
	}

	public Pattern getPatternForRootNote(String musicString) {
		return getPatternForRootNote(new Pattern(musicString));
	}

	public Pattern getPatternForRootNote(Pattern pattern) {
		Note rootNote = MusicStringParser.getNote(pattern);
		return getPatternForRootNote(rootNote);
	}

	public Pattern getPatternForRootNote(Note rootNote) {
		StringBuilder buddy = new StringBuilder();
		String[] tokens = getMusicStringWithIntervals().split(" ");
		byte rootNoteValue = rootNote.getValue();

		// Go through the Pattern, and replace intervals specified within < and
		// > with the root note plus the interval value, minus 1
		for (int i = 0; i < tokens.length; i++) {
			int lastAngleBracketPosition = -1;
			boolean leftAngleBracketExists = (tokens[i].indexOf('<') != -1);

			if (leftAngleBracketExists) {
				while (leftAngleBracketExists) {
					int start = tokens[i].indexOf('<',
							lastAngleBracketPosition);
					int end = tokens[i].indexOf('>', start);
					String intervalString = tokens[i].substring(start + 1, end);
					byte intervalValue = 0;
					try {
						intervalValue = Byte.valueOf(intervalString);
					} catch (NumberFormatException e) {
						throw new JFugueException(JFugueException.EXPECTED_BYTE,
								intervalString, tokens[i]);
					}

					buddy.append("[");
					buddy.append(rootNoteValue + intervalValue - 1);
					buddy.append("]");

					lastAngleBracketPosition = end;
					int nextLeftAngleBracketPosition = tokens[i].indexOf('<',
							lastAngleBracketPosition - 1);
					if (nextLeftAngleBracketPosition == -1) {
						buddy.append(tokens[i].substring(end + 1,
								tokens[i].length())); // Add the rest of the
														// token
						leftAngleBracketExists = false;
					} else {
						buddy.append(tokens[i].substring(end + 1,
								nextLeftAngleBracketPosition)); // Add the rest
																// of the token
																// up to the
																// next angle
						leftAngleBracketExists = true;
					}
				}
			} else {
				buddy.append(tokens[i]);
			}
			buddy.append(" ");
		}

		return new Pattern(buddy.toString());

	}
}