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/*
 * Copyright 2016 The original authors.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

package io.sundr.codegen.functions;

import java.util.Map;
import java.util.HashMap;
import java.util.Arrays;
import io.sundr.Function;
import java.util.List;

public enum Pluralize implements Function {

    FUNCTION;

    private static final List UNCOUNTABLE = Arrays.asList("equipment", "fish", "information", "money", "rice", "series", "sheep", "species");

    private static final List> PLURALS = Arrays.>asList(
            //Irregulars
            new StringReplace("(p)eople$", "$1erson"),
            new StringReplace("(m)en$", "$1an"),
            new StringReplace("(c)hildren$", "$1hild"),
            new StringReplace("(s)exes$", "$1ex"),
            new StringReplace("(m)oves$", "$1ove"),
            new StringReplace("(s)tadiums$", "$1tadium"),

            //Rules
            new StringReplace("(quiz)$", "$1zes"),
            new StringReplace("(matr)ix$", "$1ices"),
            new StringReplace("(vert|ind)ex$", "$1ices"),
            new StringReplace("^(ox)$", "$1en"),
            new StringReplace("(alias|status)$", "$1"),
            new StringReplace("(alias|status)$", "$1es"),
            new StringReplace("(octop|vir)us$", "$1us"),
            new StringReplace("(cris|ax|test)is$", "$1es"),
            new StringReplace("(shoe)$", "$1s"),
            new StringReplace("(o)$", "$1es"),
            new StringReplace("(bus)$", "$1es"),
            new StringReplace("([m|l])ouse$", "$1ice"),
            new StringReplace("(x|ch|ss|sh)$", "$1es"),
            new StringReplace("(m)ovie$", "$1ovies"),
            new StringReplace("(s)eries$", "$1eries"),
            new StringReplace("([^aeiouy]|qu)y$", "$1ies"),
            new StringReplace("([lr])f$", "$1ves"),
            new StringReplace("(tive)$", "$1s"),
            new StringReplace("(hive)$", "$1s"),
            new StringReplace("([^f])fe$", "$1ves"),
            new StringReplace("(^analy)sis$", "$1sis"),
            new StringReplace("((a)naly|(b)a|(d)iagno|(p)arenthe|(p)rogno|(s)ynop|(t)he)ses$", "$1$2sis"),
            new StringReplace("([ti])um$", "$1a"),
            new StringReplace("(n)ews$", "$1ews"),
            new StringReplace("(s|si|u)s$", "$1s")
    );

    public String apply(String word) {
        if (word == null) {
            return null;
        } else if (word.isEmpty()) {
            return word;
        } else if (UNCOUNTABLE.contains(word)) {
            return word;
        } else if (isAlreadyPlural(word)) {
            return word;
        }

        for (Function function : PLURALS) {
            String result = function.apply(word);
            if (result != null) {
                return result;
            }
        }
        return word + "s";
    }

    /**
     * Rudimentary implementation of checking whether word is plural or not.
     * It can be further improved to handle complex cases.
     *
     * @param word
     * @return Boolean value indicating whether it's already plural or not
     */
    private boolean isAlreadyPlural(String word) {
        if(!word.endsWith("ss")) {
            if(word.endsWith("s")) {
                return true;
            }
        }
        return false;
    }

}