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Simple persistent scheduler for scheduled tasks, recurring or ad-hoc.

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/*
 * Copyright 2014 jmrozanec
 * 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.kagkarlsson.shaded.cronutils.utils;

import java.time.Duration;
import java.time.ZonedDateTime;
import java.util.Collections;
import java.util.List;

public class DateUtils {
    private DateUtils(){}

    public static int workdaysCount(ZonedDateTime startDate, int days, List holidays, WeekendPolicy weekendPolicy){
        return workdaysCount(startDate, startDate.plusDays(days), holidays, weekendPolicy);
    }

    public static int workdaysCount(ZonedDateTime startDate, ZonedDateTime endDate, List holidays, WeekendPolicy weekendPolicy){
        Collections.sort(holidays);
        holidays = holidaysInRange(startDate, endDate, holidays);
        int daysToWeekend = WeekendPolicy.daysToWeekend(weekendPolicy, startDate);
        int daysFromWeekend = WeekendPolicy.daysFromWeekend(weekendPolicy, endDate);
        int daysBetween = (int)Duration.between(startDate, endDate).toDays()+1;

        //2+ [xxx+2]/7*5
        int tmpWeekdays = (daysBetween-daysToWeekend-daysFromWeekend-2)/7*5;
        tmpWeekdays = tmpWeekdays-holidays.size();

        return tmpWeekdays+daysToWeekend+daysFromWeekend;
    }

    private static List holidaysInRange(ZonedDateTime startDate, ZonedDateTime endDate, List holidays){
        if(holidays.isEmpty()){
            return holidays;
        }
        int idxstart = findIdx(0, holidays.size()-1, startDate, holidays);
        int idxend = findIdx(0, holidays.size()-1, endDate, holidays);
        return holidays.subList(idxstart, idxend+1);
    }

    private static int findIdx(int startidx, int endidx, ZonedDateTime endDate, List holidays){
        if(startidx==endidx){
            return startidx;
        }
        int pivot = (endidx-startidx)/2;

        if(holidays.get(pivot).equals(endDate)){
            return pivot;
        }
        if(holidays.get(pivot).isBefore(endDate)){
            return findIdx(++pivot, endidx, endDate, holidays);
        }else{
            return findIdx(startidx, pivot, endDate, holidays);
        }
    }
}