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/*
   Copyright 2021 the original author or authors.

   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 one.cafebabe.businesscalendar4j;

import java.time.DayOfWeek;
import java.time.LocalDate;
import java.time.temporal.ChronoUnit;
import java.time.temporal.TemporalAdjusters;
import java.util.Arrays;
import java.util.List;
import java.util.function.Function;
import java.util.function.Predicate;

import static one.cafebabe.businesscalendar4j.BusinessCalendarPredicate.holiday;
import static one.cafebabe.businesscalendar4j.BusinessCalendarPredicate.predicate;

/**
 * Holidays in the United States
 */
public class UnitedStates {


    /**
     * New Year's Day
     */
    public final Function NEW_YEARS_DAY =
            substitution(predicate(1, 1), "unitedStates.NewYearsDay");
    /**
     * Martin Luther King Jr. Day
     */
    public final Function MARTIN_LUTHER_KING_JR_DAY =
            holiday(predicate(3, DayOfWeek.MONDAY, 1), "unitedStates.MartinLutherKingJrDay");
    /**
     * Memorial Day
     */
    public final Function MEMORIAL_DAY =
            holiday(date -> date.getMonthValue() == 5 && date.getDayOfMonth() ==
                    date.with(TemporalAdjusters.lastInMonth(DayOfWeek.MONDAY)).getDayOfMonth(), "unitedStates.MemorialDay");
    /**
     * Independence Day/
     */
    public final Function INDEPENDENCE_DAY =
            substitution(predicate(7, 4), "unitedStates.IndependenceDay");
    /**
     * Labor Day
     * https://en.wikipedia.org/wiki/Labor_Day
     */
    public final Function LABOR_DAY =
            holiday(predicate(1, DayOfWeek.MONDAY, 9), "unitedStates.LaborDay");
    /**
     * Veterans' Day
     */
    public final Function VETERANS_DAY =
            substitution(predicate(11, 11), "unitedStates.VeteransDay");
    /**
     * Thanksgiving
     */
    public final Function THANKSGIVING_DAY =
            holiday(predicate(4, DayOfWeek.THURSDAY, 11), "unitedStates.ThanksgivingDay");
    /**
     * Christmas Day
     */
    public final Function CHRISTMAS_DAY =
            substitution(predicate(12, 25), "unitedStates.ChristmasDay");


    private static Function substitution(Predicate predicate, String name) {
        return date -> {
            if (predicate.test(date)) {
                return name;
            }
            LocalDate movedFrom = null;
            if (date.getDayOfWeek() == DayOfWeek.MONDAY) {
                movedFrom = date.minus(1, ChronoUnit.DAYS);
            } else if (date.getDayOfWeek() == DayOfWeek.FRIDAY) {
                movedFrom = date.plus(1, ChronoUnit.DAYS);
            }
            if (movedFrom != null) {
                if (predicate.test(movedFrom)) {
                    return "${" + name + "} (${unitedStates.observed})";
                }
            }
            return null;
        };
    }

    private UnitedStates() {
    }

    private static final UnitedStates singleton = new UnitedStates();

    static UnitedStates getInstance() {
        return singleton;
    }

    private final List> all = Arrays.asList(NEW_YEARS_DAY, MARTIN_LUTHER_KING_JR_DAY,
            MEMORIAL_DAY, INDEPENDENCE_DAY, LABOR_DAY, VETERANS_DAY, THANKSGIVING_DAY, CHRISTMAS_DAY);

    /**
     * Public holidays in the United States
     */
    public Function PUBLIC_HOLIDAYS = localDate -> {
        for (Function localDateStringFunction : all) {
            final String apply = localDateStringFunction.apply(localDate);
            if (apply != null) {
                return apply;
            }
        }
        return null;
    };
}