/*
 * Copyright (c) 2004-2022, University of Oslo
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * Neither the name of the HISP project nor the names of its contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.hisp.dhis.analytics.util;

import java.util.Arrays;
import java.util.Date;
import java.util.List;
import java.util.Optional;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
import org.hisp.dhis.common.RepeatableStageParams;
import org.hisp.dhis.common.exception.InvalidRepeatableStageParamsException;
import org.hisp.dhis.period.Period;
import org.hisp.dhis.period.RelativePeriodEnum;
import org.hisp.dhis.period.RelativePeriods;
import org.hisp.dhis.util.DateUtils;

public class RepeatableStageParamsHelper {
  private static final String SEPARATOR = "~";

  // [-1]
  private static final String PS_INDEX_REGEX = "\\[-?\\d+\\]";

  // [*]
  private static final String PS_ASTERISK_REGEX = "\\[\\*\\]";

  // [1, 2]
  private static final String PS_INDEX_COUNT_REGEX = "\\[-?\\d+" + SEPARATOR + "\\s*\\d+\\]";

  // [1, 2, 2022-01-01, 2022-03-31]
  private static final String PS_INDEX_COUNT_START_DATE_END_DATE_REGEX =
      "\\[-?\\d+"
          + SEPARATOR
          + "\\s*\\d+"
          + SEPARATOR
          + "\\s*\\d{4}\\-(0[1-9]|1[012])\\-(0[1-9]|[12][0-9]|3[01])"
          + SEPARATOR
          + "\\s*\\d{4}\\-(0[1-9]|1[012])\\-(0[1-9]|[12][0-9]|3[01])\\]";

  // [1,30, LAST_YEAR]
  private static final String PS_INDEX_COUNT_RELATIVE_PERIOD_REGEX =
      "\\[-?\\d+" + SEPARATOR + "\\s*\\d+" + SEPARATOR + "\\s*\\w+\\]";

  // [2022-01-01, 2022-03-31]
  private static final String PS_START_DATE_END_DATE_REGEX =
      "\\[\\d{4}\\-(0[1-9]|1[012])\\-(0[1-9]|[12][0-9]|3[01])"
          + SEPARATOR
          + "\\s*\\d{4}\\-(0[1-9]|1[012])\\-(0[1-9]|[12][0-9]|3[01])\\]";

  // [LAST_3_MONTHS]
  private static final String PS_RELATIVE_PERIOD_REGEX = "\\[\\w+\\]";

  private static final Pattern[] PS_PARAMS_PATTERN_LIST = {
    Pattern.compile(PS_INDEX_REGEX),
    Pattern.compile(PS_ASTERISK_REGEX),
    Pattern.compile(PS_INDEX_COUNT_REGEX),
    Pattern.compile(PS_INDEX_COUNT_START_DATE_END_DATE_REGEX),
    Pattern.compile(PS_INDEX_COUNT_RELATIVE_PERIOD_REGEX),
    Pattern.compile(PS_START_DATE_END_DATE_REGEX),
    Pattern.compile(PS_RELATIVE_PERIOD_REGEX)
  };

  /** private constructor */
  private RepeatableStageParamsHelper() {}

  /**
   * @param dimension
   * @return RepeatableStageParams
   * @throws InvalidRepeatableStageParamsException
   */
  public static RepeatableStageParams getRepeatableStageParams(String dimension)
      throws InvalidRepeatableStageParamsException {
    Pattern pattern =
        Arrays.stream(PS_PARAMS_PATTERN_LIST)
            .filter(p -> p.matcher(dimension).find())
            .findFirst()
            .orElse(Pattern.compile(""));

    Matcher matcher = pattern.matcher(dimension);

    List<String> tokens;

    switch (pattern.toString()) {
      case PS_ASTERISK_REGEX:
        return getRepeatableStageParams(0, Integer.MAX_VALUE);
      case PS_INDEX_COUNT_REGEX:
        tokens = getMatchedRepeatableStageParamTokens(matcher, 2);

        return getRepeatableStageParams(
            Integer.parseInt(tokens.get(0)), Integer.parseInt(tokens.get(1)));
      case PS_INDEX_REGEX:
        return getRepeatableStageParams(Integer.parseInt(getDefaultIndex(matcher)), 1);
      case PS_INDEX_COUNT_START_DATE_END_DATE_REGEX:
        tokens = getMatchedRepeatableStageParamTokens(matcher, 4);

        return getRepeatableStageParams(
            Integer.parseInt(tokens.get(0)),
            Integer.parseInt(tokens.get(1)),
            DateUtils.parseDate(tokens.get(2)),
            DateUtils.parseDate(tokens.get(3)));
      case PS_INDEX_COUNT_RELATIVE_PERIOD_REGEX:
        tokens = getMatchedRepeatableStageParamTokens(matcher, 3);

        return getRepeatableStageParams(
            Integer.parseInt(tokens.get(0)),
            Integer.parseInt(tokens.get(1)),
            getRelativePeriods(tokens.get(2)));
      case PS_START_DATE_END_DATE_REGEX:
        tokens = getMatchedRepeatableStageParamTokens(matcher, 2);

        return getRepeatableStageParams(
            DateUtils.parseDate(tokens.get(0)), DateUtils.parseDate(tokens.get(1).trim()));
      case PS_RELATIVE_PERIOD_REGEX:
        tokens = getMatchedRepeatableStageParamTokens(matcher, 1);

        return getRepeatableStageParams(getRelativePeriods(tokens.get(0)));
      default:
        return new RepeatableStageParams();
    }
  }

  /**
   * @param matcher
   * @return the string representation of start index
   * @throws InvalidRepeatableStageParamsException
   */
  private static String getDefaultIndex(Matcher matcher)
      throws InvalidRepeatableStageParamsException {
    if (!matcher.find()) {
      throw new InvalidRepeatableStageParamsException();
    }

    return matcher.group(0).replace("[", "").replace("]", "");
  }

  /**
   * @param period
   * @return relative period
   * @throws InvalidRepeatableStageParamsException
   */
  private static List<Period> getRelativePeriods(String period)
      throws InvalidRepeatableStageParamsException {
    if (!RelativePeriodEnum.contains(period)) {
      throw new InvalidRepeatableStageParamsException();
    }

    List<Period> periods =
        RelativePeriods.getRelativePeriodsFromEnum(RelativePeriodEnum.valueOf(period), new Date());

    if (periods.isEmpty()) {
      throw new InvalidRepeatableStageParamsException();
    }

    return periods;
  }

  /**
   * @param dimension
   * @return dimension without params like edqlbukwRfQ[2021-01-01,2022-05-31].vANAXwtLwcT ->
   *     edqlbukwRfQ.vANAXwtLwcT
   */
  public static String removeRepeatableStageParams(String dimension) {
    Optional<Pattern> pattern =
        Arrays.stream(PS_PARAMS_PATTERN_LIST).filter(p -> p.matcher(dimension).find()).findFirst();

    if (pattern.isEmpty()) {
      return dimension;
    }

    Matcher matcher = pattern.get().matcher(dimension);

    if (matcher.find()) {
      return dimension.replace(matcher.group(0), "");
    }

    return dimension;
  }

  /**
   * @param startIndex
   * @param count
   * @return RepeatableStageParams instance
   */
  private static RepeatableStageParams getRepeatableStageParams(int startIndex, int count) {
    RepeatableStageParams repeatableStageParams = new RepeatableStageParams();
    repeatableStageParams.setStartIndex(startIndex);
    repeatableStageParams.setCount(count);
    repeatableStageParams.setDefaultObject(false);

    return repeatableStageParams;
  }

  /**
   * @param startIndex
   * @param count
   * @param periods
   * @return RepeatableStageParams instance
   * @throws InvalidRepeatableStageParamsException
   */
  private static RepeatableStageParams getRepeatableStageParams(
      int startIndex, int count, List<Period> periods)
      throws InvalidRepeatableStageParamsException {
    if (periods.isEmpty()) {
      throw new InvalidRepeatableStageParamsException();
    }

    return getRepeatableStageParams(
        startIndex,
        count,
        periods.get(0).getStartDate(),
        periods.get(periods.size() - 1).getEndDate());
  }

  /**
   * @param startIndex
   * @param count
   * @param startDate
   * @param endDate
   * @return RepeatableStageParams instance
   */
  private static RepeatableStageParams getRepeatableStageParams(
      int startIndex, int count, Date startDate, Date endDate) {
    RepeatableStageParams repeatableStageParams = new RepeatableStageParams();
    repeatableStageParams.setStartIndex(startIndex);
    repeatableStageParams.setCount(count);
    repeatableStageParams.setStartDate(startDate);
    repeatableStageParams.setEndDate(endDate);
    repeatableStageParams.setDefaultObject(false);

    return repeatableStageParams;
  }

  /**
   * @param periods
   * @return RepeatableStageParams instance
   * @throws InvalidRepeatableStageParamsException
   */
  private static RepeatableStageParams getRepeatableStageParams(List<Period> periods)
      throws InvalidRepeatableStageParamsException {
    if (periods.isEmpty()) {
      throw new InvalidRepeatableStageParamsException();
    }

    return getRepeatableStageParams(
        periods.get(0).getStartDate(), periods.get(periods.size() - 1).getEndDate());
  }

  /**
   * @param startDate
   * @param endDate
   * @return RepeatableStageParams instance
   */
  private static RepeatableStageParams getRepeatableStageParams(Date startDate, Date endDate) {
    RepeatableStageParams repeatableStageParams = new RepeatableStageParams();
    repeatableStageParams.setStartIndex(0);
    repeatableStageParams.setCount(Integer.MAX_VALUE);
    repeatableStageParams.setStartDate(startDate);
    repeatableStageParams.setEndDate(endDate);
    repeatableStageParams.setDefaultObject(false);

    return repeatableStageParams;
  }

  /**
   * @param matcher
   * @param expectedTokenCount
   * @return RepeatableStageParams instance
   * @throws InvalidRepeatableStageParamsException
   */
  private static List<String> getMatchedRepeatableStageParamTokens(
      Matcher matcher, int expectedTokenCount) throws InvalidRepeatableStageParamsException {
    String params = "0";

    if (matcher.find()) {
      params = matcher.group(0).replace("[", "").replace("]", "");
    }

    String[] tokens = params.split(SEPARATOR);

    if (tokens.length != expectedTokenCount) {
      throw new InvalidRepeatableStageParamsException();
    }

    return Arrays.stream(tokens).map(String::trim).collect(Collectors.toList());
  }
}
