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/*
 * Copyright (c) 2022 codbex or an codbex affiliate company and contributors
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v2.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v20.html
 *
 * SPDX-FileCopyrightText: 2022 codbex or an codbex affiliate company and contributors
 * SPDX-License-Identifier: EPL-2.0
 */
package com.codbex.kronos.xsjob.ds.transformer;

import com.codbex.kronos.utils.CommonsConstants;
import com.codbex.kronos.utils.CommonsUtils;
import com.codbex.kronos.xsjob.ds.api.CronExpressionException;

import java.text.ParseException;
import java.util.List;

/**
 * The Class CronToQuartzCronTransformer.
 */
public class CronToQuartzCronTransformer {

  /** The Constant KRONOS_CRON_YEAR. */
  private static final int KRONOS_CRON_YEAR = 0;
  
  /** The Constant KRONOS_CRON_MONTH. */
  private static final int KRONOS_CRON_MONTH = 1;
  
  /** The Constant KRONOS_CRON_DAY. */
  private static final int KRONOS_CRON_DAY = 2;
  
  /** The Constant KRONOS_CRON_DAY_OF_WEEK. */
  private static final int KRONOS_CRON_DAY_OF_WEEK = 3;
  
  /** The Constant KRONOS_CRON_HOUR. */
  private static final int KRONOS_CRON_HOUR = 4;
  
  /** The Constant KRONOS_CRON_MINUTE. */
  private static final int KRONOS_CRON_MINUTE = 5;
  
  /** The Constant KRONOS_CRON_SECOND. */
  private static final int KRONOS_CRON_SECOND = 6;

  /** The cron expression arr. */
  private String[] cronExpressionArr;

  /**
   * Instantiates a new cron to quartz cron transformer.
   */
  public CronToQuartzCronTransformer() {
  }

  /**
   * Transform.
   *
   * @param cronExpression the cron expression
   * @return the string
   * @throws ParseException the parse exception
   */
  public String transform(String cronExpression) throws ParseException {

    cronExpressionArr = cronExpression.split(" ");

    QuartzCronExpression quartzCronExpression = new QuartzCronExpression();
    try {
      quartzCronExpression.setYear(parseRange(cronExpressionArr[KRONOS_CRON_YEAR]));
      quartzCronExpression.setMonth(parseRange(cronExpressionArr[KRONOS_CRON_MONTH]));
      quartzCronExpression.setDayOfMonth(checkDayOfWeekAndDayOfMonth());

      String quartzDayOfWeek = parseRange(cronExpressionArr[KRONOS_CRON_DAY_OF_WEEK]);
      quartzDayOfWeek = parseDayOfWeekElement(quartzDayOfWeek);
      quartzCronExpression.setDayOfWeek(quartzDayOfWeek);

      quartzCronExpression.setHours(parseRange(cronExpressionArr[KRONOS_CRON_HOUR]));
      quartzCronExpression.setMinutes(parseRange(cronExpressionArr[KRONOS_CRON_MINUTE]));
      quartzCronExpression.setSeconds(parseRange(cronExpressionArr[KRONOS_CRON_SECOND]));
    } catch (Exception e) {
      CommonsUtils.logProcessorErrors(e.getMessage(), CommonsConstants.PROCESSOR_ERROR, cronExpression, CommonsConstants.JOB_PARSER);
      throw e;
    }
    return quartzCronExpression.toString();
  }

  /**
   * Parses the range.
   *
   * @param cronElement the cron element
   * @return the string
   */
  private String parseRange(String cronElement) {
    if (!cronElement.contains(":")) {
      return cronElement;
    }

    String[] splitXscCronElement = cronElement.split(":");

    return String.join("-", splitXscCronElement);
  }

  /**
   * Parses the day of week element.
   *
   * @param dayOfWeekElement the day of week element
   * @return the string
   * @throws ParseException the parse exception
   */
  private String parseDayOfWeekElement(String dayOfWeekElement) throws ParseException {
    if (dayOfWeekElement.equals("*") &&
        cronExpressionArr[KRONOS_CRON_DAY].equals("*")) {
      return "?";
    } else if (!dayOfWeekElement.contains(".")) {
      return dayOfWeekElement.toUpperCase();
    }

    String[] splitDayOfWeekElement = dayOfWeekElement.split(".");
    String dayOfWeek = splitDayOfWeekElement[1].toUpperCase();

    int occurrence = Integer.parseInt(splitDayOfWeekElement[0]);

    if (occurrence >= 0) {
      return dayOfWeek + "#" + occurrence;
    } else if (occurrence == -1) {
      return dayOfWeek + "L";
    } else if (occurrence < -1 && occurrence >= -5) {
      return dayOfWeek + "L" + "-" + occurrence;
    }

    throw new CronExpressionException(String.join(" ", cronExpressionArr), KRONOS_CRON_DAY_OF_WEEK);
  }

  /**
   * Check day of week and day of month.
   *
   * @return the string
   */
  private String checkDayOfWeekAndDayOfMonth(){
    final List cronExpressionDayOfWeekArr = List.of("mon", "tue", "wed", "thu", "fri", "sat", "sun", "1", "2", "3", "4", "5", "6", "7");
    final List dayOfWeekList = List.of(cronExpressionArr[KRONOS_CRON_DAY_OF_WEEK].split(","));

    boolean isEveryDay = cronExpressionArr[KRONOS_CRON_DAY].equalsIgnoreCase("*");
    boolean hasDayOfWeek = dayOfWeekList.stream().map(String::toLowerCase).anyMatch(cronExpressionDayOfWeekArr::contains);

    return isEveryDay && hasDayOfWeek ? "?" : parseRange(cronExpressionArr[KRONOS_CRON_DAY]);
  }
}