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/*
 * Copyright 2015 Netflix, Inc.
 *
 * 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.netflix.fenzo.triggers;

import org.joda.time.Interval;
import org.quartz.CronExpression;

import java.text.ParseException;
import java.util.StringTokenizer;

/**
 * @author sthadeshwar
 */
public class TriggerUtils {

    public static boolean isValidCronExpression(String cronExpression) {
        try {
            validateCronExpression(cronExpression);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    public static void validateCronExpression(String cronExpression) {
        try {
            if (cronExpression == null || cronExpression.equals("")) {
                throw new IllegalArgumentException(String.format("Cron expression cannot be null or empty : %s", cronExpression));
            }
            StringTokenizer tokenizer = new StringTokenizer(cronExpression, " \t", false);
            int tokens = tokenizer.countTokens();
            String beginningToken = tokenizer.nextToken().trim();
            if ("*".equals(beginningToken)) {
                // For all practical purposes and for ALL clients of this library, this is true!
                throw new IllegalArgumentException(
                    String.format("Cron expression cannot have '*' in the SECONDS (first) position : %s", cronExpression)
                );
            }
            if (tokens > 7) {
                throw new IllegalArgumentException(
                    String.format("Cron expression cannot have more than 7 fields : %s", cronExpression)
                );
            }
            CronExpression.validateExpression(cronExpression);
        } catch (ParseException e) {
            throw new IllegalArgumentException(e.getMessage());
        }
    }

    public static boolean isValidISO8601Interval(String iso8601Interval) {
        try {
            Interval.parse(iso8601Interval);
            return true;
        } catch (Exception e) {
            return false;
        }
    }

    public static void validateISO8601Interval(String iso8601Interval) {
        try {
            Interval.parse(iso8601Interval);
        } catch (Exception e) {
            throw new IllegalArgumentException(e.getMessage());
        }
    }
}