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/*
 * Copyright (c) 2010-2021 Haifeng Li. All rights reserved.
 *
 * Smile 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, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Smile 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 Smile.  If not, see .
 */

package smile.nlp;

import java.util.Arrays;
import java.util.HashMap;
import smile.util.MutableInt;
import smile.util.Strings;

/**
 * A list-of-words representation of documents.
 *
 * @author Haifeng Li
 */
public class SimpleText extends Text implements TextTerms, AnchorText {
    /**
     * All anchor text in the corpus pointing to this text.
     */
    private String anchor;

    /**
     * The list of words.
     */
    private final String[] words;
    /**
     * The term frequency.
     */
    private final HashMap freq = new HashMap<>();
    /**
     * The maximum term frequency over all terms in the documents;
     */
    private int maxtf;

    /**
     * Constructor.
     * @param id the id of document.
     * @param title the title of document.
     * @param body the text body of document.
     * @param words the word list of document.
     */
    public SimpleText(String id, String title, String body, String[] words) {
        super(id, title, body);

        this.words = words;

        for (String w : words) {
            MutableInt count = freq.get(w);
            if (count == null) {
                count = new MutableInt(1);
                freq.put(w, count);
            } else {
                count.increment();
            }

            if (count.value > maxtf) {
                maxtf = count.value;
            }
        }
    }
    
    @Override
    public int size() {
        return words.length;
    }

    @Override
    public Iterable words() {
        return Arrays.asList(words);
    }

    @Override
    public Iterable unique() {
        return freq.keySet();
    }
    
    @Override
    public int tf(String term) {
        MutableInt count = freq.get(term);
        return count == null ? 0 : count.value;
    }

    @Override
    public int maxtf() {
        return maxtf;
    }

    /**
     * Returns the anchor text if any. The anchor text is the visible,
     * clickable text in a hyperlink. The anchor text is all the
     * anchor text in the corpus pointing to this text.
     */
    public String getAnchor() {
        return anchor;
    }
    
    /**
     * Sets the anchor text. Note that anchor is all link labels in the corpus
     * pointing to this text. So addAnchor is more appropriate in most cases.
     */
    public SimpleText setAnchor(String anchor) {
        this.anchor = anchor;
        return this;
    }
    
    public SimpleText addAnchor(String linkLabel) {
        if (anchor == null) {
            anchor = linkLabel;
        } else {
            anchor = anchor + "\n" + linkLabel;
        }
        return this;
    }
    
    @Override
    public String toString() {
        return String.format("Document[%s]", Strings.isNullOrEmpty(title) ? id : title);
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == null) {
            return false;
        }

        if (getClass() != obj.getClass()) {
            return false;
        }

        final SimpleText other = (SimpleText) obj;
        return id.equals(other.id);
    }

    @Override
    public int hashCode() {
        return id.hashCode();
    }
}