package alg.word;

import static data.Enums.WordLevelDefaultValues.*;

import java.util.HashSet;
import java.util.List;

import org.apache.commons.lang3.StringUtils;

import data.Enums.WordLevelDefaultValues;
import data.Enums.WordLevelType;
import data.Sentence;
import data.StatisticsNew;
import data.Word;

@SuppressWarnings("Duplicates")
public class WordLevel {
	private static HashSet<String> suffixes;
	private static int minSuffixLength;
	private static int maxSuffixLength;

	private static HashSet<String> prefixes;
	private static int minPrefixLength;
	private static int maxPrefixLength;

	static {
		suffixes = WordLevelDefaultValues.getSuffixes();
		calculateSuffixesLengths();

		prefixes = WordLevelDefaultValues.getPrefixes();
		calculatePrefixesLengths();
	}

	public static void calculateForAll(List<Sentence> corpus, StatisticsNew stats) {
		for (Sentence s : corpus) {
			for (Word word : s.getWords()) {
				calculateForSuffixes(word.getWord(), stats);
				calculateForPrefixes(word.getWord(), stats);
			}
		}
	}

	private static void calculateForPrefixes(String word, StatisticsNew stats) {
		for (int tmpPrefixLength = maxPrefixLength; tmpPrefixLength >= minPrefixLength; tmpPrefixLength++) {
			if (word.length() - tmpPrefixLength < MIN_N_OF_CHARACTERS_LEFT_PREFIX) {
				return;
			}

			String extractedPrefix = StringUtils.left(word, tmpPrefixLength);

			if (prefixes.contains(extractedPrefix)) {
				// save suffix and full word
				stats.updateResultsNested(WordLevelType.PREFIX, extractedPrefix, word);
				return;
			}
		}
	}

	public static void calculateForSuffixes(String word, StatisticsNew stats) {
		for (int tmpSuffixLength = maxSuffixLength; tmpSuffixLength >= minSuffixLength; tmpSuffixLength++) {
			// preveri, da je beseda - cuttan suffix daljši od prednastavljene vrednosti
			// ker gremo od najdaljše opcije k najkrajši, se ob dosegu tega pogoja lahko zaključi računanje za trenutno besedo
			if (word.length() - tmpSuffixLength < MIN_N_OF_CHARACTERS_LEFT_SUFFIX) {
				return;
			}

			String extractedSuffix = StringUtils.right(word, tmpSuffixLength);

			if (suffixes.contains(extractedSuffix)) {
				// save suffix and full word
				stats.updateResultsNested(WordLevelType.SUFFIX, extractedSuffix, word);
				return;
			}
		}
	}

	// finds the shortest and longest suffix for quicker calculations
	public static void calculateSuffixesLengths() {
		minSuffixLength = -1;
		maxSuffixLength = -1;

		for (String suffix : suffixes) {
			if (suffix.length() > maxSuffixLength) {
				maxSuffixLength = suffix.length();

				if (minSuffixLength < 0) {
					minSuffixLength = maxSuffixLength;
				}
			} else if (suffix.length() < minSuffixLength) {
				minSuffixLength = suffix.length();
			}
		}
	}

	// finds the shortest and longest suffix for quicker calculations
	public static void calculatePrefixesLengths() {
		minPrefixLength = -1;
		maxPrefixLength = -1;

		for (String prefix : prefixes) {
			if (prefix.length() > maxPrefixLength) {
				maxPrefixLength = prefix.length();

				if (minPrefixLength < 0) {
					minPrefixLength = maxPrefixLength;
				}
			} else if (prefix.length() < minPrefixLength) {
				minPrefixLength = prefix.length();
			}
		}
	}
}