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/*
 * The MIT License
 *
 *   Copyright (c) 2020, Mahmoud Ben Hassine ([email protected])
 *
 *   Permission is hereby granted, free of charge, to any person obtaining a copy
 *   of this software and associated documentation files (the "Software"), to deal
 *   in the Software without restriction, including without limitation the rights
 *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 *   copies of the Software, and to permit persons to whom the Software is
 *   furnished to do so, subject to the following conditions:
 *
 *   The above copyright notice and this permission notice shall be included in
 *   all copies or substantial portions of the Software.
 *
 *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 *   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 *   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 *   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 *   THE SOFTWARE.
 */
package org.jeasy.random.randomizers;

import org.jeasy.random.api.Randomizer;

/**
 * A {@link Randomizer} that generates random strings matching a regular expression.
 */
public class RegularExpressionRandomizer extends FakerBasedRandomizer {

    private final String regularExpression;

    /**
     * Create a new {@link RegularExpressionRandomizer}.
     *
     * @param regularExpression the regular expression which strings generated by this randomizer will match.
     */
    public RegularExpressionRandomizer(final String regularExpression) {
        super();
        this.regularExpression = regularExpression;
    }

    /**
     * Create a new {@link RegularExpressionRandomizer}.
     *
     * @param regularExpression the regular expression which strings generated by this randomizer will match.
     * @param seed              the initial seed
     */
    public RegularExpressionRandomizer(final String regularExpression, final long seed) {
        super(seed);
        this.regularExpression = regularExpression;
    }

    @Override
    public String getRandomValue() {
        return faker.regexify(removeLeadingAndTailingBoundaryMatchers(regularExpression));
    }

    private static String removeLeadingAndTailingBoundaryMatchers(String regularExpression) {
        String regularExpressionWithoutBoundaryMatchers = regularExpression;
        int lastIndex = regularExpressionWithoutBoundaryMatchers.length() - 1;
        if (regularExpressionWithoutBoundaryMatchers.indexOf('^') == 0) {
            regularExpressionWithoutBoundaryMatchers = regularExpressionWithoutBoundaryMatchers.substring(1, lastIndex + 1);
            lastIndex = regularExpressionWithoutBoundaryMatchers.length() - 1;
        }
        if (regularExpressionWithoutBoundaryMatchers.lastIndexOf('$') == lastIndex) {
            regularExpressionWithoutBoundaryMatchers = regularExpressionWithoutBoundaryMatchers.substring(0, lastIndex);
        }
        return regularExpressionWithoutBoundaryMatchers;
    }
}