package br.com.pipi.util;

import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;


public class FeriadosUtil {

    private final static long DAY_IN_MILLIS = 86400000;

    public static Calendar getCarnaval(final int year) {
        return getSubtractedDays(getSundayOfEaster(year), 47);
    }

    public static Calendar getSemanaSanta(final int year) {
        return getSubtractedDays(getSundayOfEaster(year), 2);
    }

    public static Calendar getCorpusChristi(final int year) {
        return getAddedDays(getSundayOfEaster(year), 60);
    }

    public static Calendar getPascoa(final int year) {
        return DateToCalendar(getSundayOfEaster(year));
    }

    public static Date getSundayOfEaster(final int year) {

        // step 2
        final int a = year % 19;

        // step 3
        final int b = year / 100;
        final int c = year % 100;

        // step 4
        final int d = b / 4;
        final int e = b % 4;

        // step 5
        final int g = (8 * b + 13) / 25;

        // step 6
        final int h = (19 * a + b - d - g + 15) % 30;

        // step 7
        final int j = c / 4;
        final int k = c % 4;

        // step 8
        final int m = (a + 11 * h) / 319;

        // step 9
        final int r = (2 * e + 2 * j - k - h + m + 32) % 7;

        // step 10
        final int n = (h - m + r + 90) / 25;

        // step 11 (finally)
        final int p = (h - m + r + n + 19) % 32;

        // building the actual date
        final Calendar calendar = new GregorianCalendar();
        calendar.set(Calendar.YEAR, year);
        calendar.set(Calendar.MONTH, n - 1);
        calendar.set(Calendar.DAY_OF_MONTH, p);
        calendar.set(Calendar.HOUR_OF_DAY, 0);
        calendar.set(Calendar.MINUTE, 0);
        calendar.set(Calendar.SECOND, 0);
        calendar.set(Calendar.MILLISECOND, 0);

        return calendar.getTime();

    }

    private static Calendar getAddedDays(final Date date, final long numOfDays) {
        final Date dateCalculate = new Date(date.getTime() + (numOfDays * DAY_IN_MILLIS));
        return DateToCalendar(dateCalculate);
    }

    private static Calendar getSubtractedDays(final Date date, final long numOfDays) {
        final Date dateCalculate = new Date(date.getTime() - (numOfDays * DAY_IN_MILLIS));
        return DateToCalendar(dateCalculate);
    }

    public static Calendar DateToCalendar(final Date date) {
        final Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        return calendar;
    }

    public static boolean isFeriado(final Calendar calendar) {

        final ArrayList<Calendar> feriados = new ArrayList<Calendar>();
        boolean found = false;

        // Ano novo
        final Calendar date = Calendar.getInstance();
        date.set(calendar.get(Calendar.YEAR), Calendar.JANUARY, 1);
        feriados.add(date);

        // Navegantes
        final Calendar date1 = Calendar.getInstance();
        date1.set(calendar.get(Calendar.YEAR), Calendar.FEBRUARY, 2);
        feriados.add(date1);

        // Carnaval
        Calendar date2 = Calendar.getInstance();
        date2 = getCarnaval(calendar.get(Calendar.YEAR));
        feriados.add(date2);

        // Pascoa
        Calendar date6 = Calendar.getInstance();
        date6 = getPascoa(calendar.get(Calendar.YEAR));
        feriados.add(date6);

        // Semana Santa
        Calendar date3 = Calendar.getInstance();
        date3 = getSemanaSanta(calendar.get(Calendar.YEAR));
        feriados.add(date3);

        // Tiradentes
        final Calendar date4 = Calendar.getInstance();
        date4.set(calendar.get(Calendar.YEAR), Calendar.APRIL, 21);
        feriados.add(date4);

        // Dia do Trabalho
        final Calendar date5 = Calendar.getInstance();
        date5.set(calendar.get(Calendar.YEAR), Calendar.MAY, 1);
        feriados.add(date5);

        // Corpus Christi
        Calendar date7 = Calendar.getInstance();
        date7 = getCorpusChristi(calendar.get(Calendar.YEAR));
        feriados.add(date7);

        // Independência do Brasil
        final Calendar date13 = Calendar.getInstance();
        date13.set(calendar.get(Calendar.YEAR), Calendar.SEPTEMBER, 7);
        feriados.add(date13);

        // Revolução Farroupilha
        final Calendar date8 = Calendar.getInstance();
        date8.set(calendar.get(Calendar.YEAR), Calendar.SEPTEMBER, 20);
        feriados.add(date8);

        // Dia das Crianças / Nossa Senhora Aparecida
        final Calendar date9 = Calendar.getInstance();
        date9.set(calendar.get(Calendar.YEAR), Calendar.OCTOBER, 12);
        feriados.add(date9);

        // Dia dos finados
        final Calendar date10 = Calendar.getInstance();
        date10.set(calendar.get(Calendar.YEAR), Calendar.NOVEMBER, 2);
        feriados.add(date10);

        // Proclamação da República
        final Calendar date11 = Calendar.getInstance();
        date11.set(calendar.get(Calendar.YEAR), Calendar.NOVEMBER, 15);
        feriados.add(date11);

        // Natal
        final Calendar date12 = Calendar.getInstance();
        date12.set(calendar.get(Calendar.YEAR), Calendar.DECEMBER, 25);
        feriados.add(date12);

        for (final Calendar feriado : feriados) {
            found = (calendar.get(Calendar.DAY_OF_YEAR) == feriado.get(Calendar.DAY_OF_YEAR));
            if (found) {
                break;
            }
        }
        return found;
    }


}