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/*
 * Copyright (C) 2011 Thomas Akehurst
 *
 * 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 com.github.tomakehurst.wiremock.extension.responsetemplating.helpers;

import com.github.jknack.handlebars.Options;
import com.github.tomakehurst.wiremock.common.DateTimeParser;

import java.io.IOException;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.format.DateTimeParseException;
import java.util.Date;
import java.util.List;

import static com.github.tomakehurst.wiremock.common.DateTimeParser.ZONED_PARSERS;
import static java.util.Collections.singletonList;

public class ParseDateHelper extends HandlebarsHelper {

    @Override
    public Object apply(String dateTimeString, Options options) throws IOException {
        String format = options.hash("format", null);

        return format == null ?
            parseOrNull(dateTimeString) :
            parseOrNull(dateTimeString, DateTimeParser.forFormat(format));
    }

    private static Date parseOrNull(String dateTimeString) {
        return parseOrNull(dateTimeString, (DateTimeParser) null);
    }

    private static Date parseOrNull(String dateTimeString, DateTimeParser parser) {
        final List parsers = parser != null ? singletonList(parser) : ZONED_PARSERS;
        return parseOrNull(dateTimeString, parsers);
    }

    private static Date parseOrNull(String dateTimeString, List parsers) {
        if (parsers.isEmpty()) {
            return null;
        }

        try {
            final DateTimeParser headParser = parsers.get(0);
            return headParser.parseDate(dateTimeString);
        } catch (DateTimeParseException e) {
            return parseOrNull(dateTimeString, parsers.subList(1, parsers.size()));
        }
    }


}