/*
 * Copyright (C) Gustav Karlsson
 *
 * <p>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
 *
 * <p>http://www.apache.org/licenses/LICENSE-2.0
 *
 * <p>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.kagkarlsson.scheduler.task.schedule;

import java.time.LocalTime;
import java.time.ZoneId;
import java.util.Arrays;
import java.util.List;
import java.util.Optional;
import java.util.regex.MatchResult;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
import java.util.stream.Stream;

final class DailyParser extends RegexBasedParser {
  private static final Pattern DAILY_PATTERN_WITH_TIMEZONE =
      Pattern.compile("^DAILY\\|((\\d{2}:\\d{2})(,\\d{2}:\\d{2})*)(\\|(.+))?$");
  private static final List<String> EXAMPLES =
      Arrays.asList("DAILY|12:00", "DAILY|12:00,13:45", "DAILY|12:00,13:45|Europe/Rome");

  DailyParser() {
    super(DAILY_PATTERN_WITH_TIMEZONE, EXAMPLES);
  }

  @Override
  protected Schedule matchedSchedule(MatchResult matchResult) {
    return maybeTimeZone(matchResult)
        .map(timeZone -> new Daily(ZoneId.of(timeZone), scheduleTimes(matchResult)))
        .orElseGet(() -> new Daily(scheduleTimes(matchResult)));
  }

  private Optional<String> maybeTimeZone(MatchResult matchResult) {
    return Optional.ofNullable(matchResult.group(5));
  }

  private List<LocalTime> scheduleTimes(MatchResult matchResult) {
    String[] times = matchResult.group(1).split(",");
    return Stream.of(times).map(LocalTime::parse).collect(Collectors.toList());
  }
}
