package smash.appointment.parse;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.log4j.Logger;

public class CellParser {
	Logger						 logger			 = Logger.getLogger(CellParser.class);

	private SubjectDao subjectDao;

	Pattern						 timePattern = Pattern.compile("^[0-9][0-9]\\:[0-9][0-9]");

	public String extractTime(String content) {
		String result = null;
		Matcher matcher = timePattern.matcher(content);
		if (matcher.find()) {
			result = matcher.group();
		}
		return result;
	}

	public String removeTime(String content) {
		Matcher matcher = timePattern.matcher(content);
		if (matcher.find()) {
			content = matcher.replaceFirst("").trim();
		}
		return content;
	}

	public AppointmentEntry parseAppointment(String query, String defaultTime) {
		AppointmentEntry result = new AppointmentEntry();

		String time = extractTime(query);
		if (time != null) {
			query = removeTime(query);
		} else {
			time = defaultTime;
		}
		result.setTime(time);

		Subject subject = extractSubject(query);
		result.setSubject(subject);

		AppointmentType type = extractType(query);
		if (type == null) {
			type = AppointmentType.OTHER;
		}
		result.setType(type);

		result.setSource(query);
		return result;
	}

	private AppointmentType extractType(String query) {
		String simplifiedQuery = Utils.simplifyString(query);

		AppointmentType result = null;

		String usedString = null;
		for (AppointmentType type : AppointmentType.values()) {
			boolean matchFound = false;
			for (String string : type.getQueryStrings()) {
				if (!matchFound) {
					String simplifiedString = Utils.simplifyString(string);

					if (simplifiedQuery.contains(simplifiedString)) {
						matchFound = true;
						if (result == null) {
							result = type;
							usedString = string;
						} else {
							if (string.contains(usedString)) {
								result = type;
								usedString = string;
							} else if (usedString.contains(string)) {
								// new one is a substring of old
							} else { // if there is no substring then we might have a problem
								AppointmentType newType = result;
								if (usedString.length() < string.length()) {
									usedString = string;
									newType = type;
								}
								logger.warn("More than one type possible for query: " + query + ". Type 1: " + result + ". Type 2: " + type + ". Choosing: " + newType);
								result = newType;
							}
						}

					}
				}
			}
		}
		return result;
	}

	private Subject extractSubject(String query) {
		Subject result = null;
		String simplifiedQuery = Utils.simplifyString(query);

		SubjectIndexer[] mainIndices = new SubjectIndexer[] { //
				new NameSurnameIndexer(), //
				new SurnameNameIndexer(), //
				new NdNumberIndexer(),//
		};

		result = getByIndices(query, simplifiedQuery, mainIndices);
		if (result == null) {
			SubjectIndexer[] secondaryIndices = new SubjectIndexer[] { //
					new SurnameIndexer(), //
			};
			result = getByIndices(query, simplifiedQuery, secondaryIndices);
		}
		return result;
	}

	private Subject getByIndices(String query, String simplifiedQuery, SubjectIndexer[] mainIndices) {
		Subject result = null;
		for (Subject subject : subjectDao.getSubjects()) {
			boolean matchFound = false;
			for (SubjectIndexer indexer : mainIndices) {
				if (!matchFound) {
					if (indexer.match(subject, simplifiedQuery)) {
						matchFound = true;
						if (result == null) {
							result = subject;
						} else {
							Subject newResult = result;
							if (indexer.isBetter(subject, result)) {
								newResult = subject;
							}
							logger.warn(
									"[" + indexer.getClass().getSimpleName() + "]" + "More than one subject possible for query: " + query + ". Subject 1: " + result
											+ ". Subject 2: " + subject + ". Choosing: " + newResult);
							result = newResult;
						}
					}
				}
			}
		}
		return result;
	}

	/**
	 * @return the subjectDao
	 * @see #subjectDao
	 */
	public SubjectDao getSubjectDao() {
		return subjectDao;
	}

	/**
	 * @param subjectDao
	 *          the subjectDao to set
	 * @see #subjectDao
	 */
	public void setSubjectDao(SubjectDao subjectDao) {
		this.subjectDao = subjectDao;
	}
}