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package com.cedarsoftware.util.convert;

import java.math.BigDecimal;
import java.math.BigInteger;
import java.sql.Timestamp;
import java.time.Instant;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.MonthDay;
import java.time.OffsetDateTime;
import java.time.Year;
import java.time.YearMonth;
import java.time.ZoneId;
import java.time.ZoneOffset;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeFormatterBuilder;
import java.time.temporal.ChronoField;
import java.util.Calendar;
import java.util.Date;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.concurrent.atomic.AtomicLong;

import com.cedarsoftware.util.DateUtilities;

/**
 * @author John DeRegnaucourt ([email protected])
 * @author Kenny Partlow ([email protected])
 *         

 *         Copyright (c) Cedar Software LLC
 *         


 *         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
 *         


 *         License
 *         


 *         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.
 */
final class CalendarConversions {

    private CalendarConversions() {}

    static Long toLong(Object from, Converter converter) {
        return ((Calendar) from).getTime().getTime();
    }

    static AtomicLong toAtomicLong(Object from, Converter converter) {
        return new AtomicLong(((Calendar) from).getTime().getTime());
    }

    static double toDouble(Object from, Converter converter) {
        Calendar calendar = (Calendar) from;
        long epochMillis = calendar.getTime().getTime();
        return epochMillis / 1000.0;
    }

    static BigDecimal toBigDecimal(Object from, Converter converter) {
        Calendar cal = (Calendar) from;
        long epochMillis = cal.getTime().getTime();
        return new BigDecimal(epochMillis).divide(BigDecimalConversions.GRAND);
    }

    static BigInteger toBigInteger(Object from, Converter converter) {
        return BigInteger.valueOf(((Calendar) from).getTime().getTime() * 1_000_000L);
    }

    static Date toDate(Object from, Converter converter) {
        return ((Calendar) from).getTime();
    }

    static java.sql.Date toSqlDate(Object from, Converter converter) {
        return java.sql.Date.valueOf(
                ((Calendar) from).toInstant()
                        .atZone(converter.getOptions().getZoneId())
                        .toLocalDate()
        );
    }

    static Timestamp toTimestamp(Object from, Converter converter) {
        return new Timestamp(((Calendar) from).getTimeInMillis());
    }

    static Instant toInstant(Object from, Converter converter) {
        Calendar calendar = (Calendar) from;
        return calendar.toInstant();
    }

    static ZonedDateTime toZonedDateTime(Object from, Converter converter) {
        Calendar calendar = (Calendar)from;
        return calendar.toInstant().atZone(calendar.getTimeZone().toZoneId());
    }

    static LocalDateTime toLocalDateTime(Object from, Converter converter) {
        return toZonedDateTime(from, converter).toLocalDateTime();
    }

    static OffsetDateTime toOffsetDateTime(Object from, Converter converter) {
        Calendar cal = (Calendar) from;
        OffsetDateTime offsetDateTime = cal.toInstant().atOffset(ZoneOffset.ofTotalSeconds(cal.getTimeZone().getOffset(cal.getTimeInMillis()) / 1000));
        return offsetDateTime;
    }

    static LocalDate toLocalDate(Object from, Converter converter) {
        return toZonedDateTime(from, converter).toLocalDate();
    }

    static LocalTime toLocalTime(Object from, Converter converter) {
        return toZonedDateTime(from, converter).toLocalTime();
    }

    static Calendar clone(Object from, Converter converter) {
        Calendar calendar = (Calendar)from;
        // mutable class, so clone it.
        return (Calendar)calendar.clone();
    }

    static Calendar create(long epochMilli, Converter converter) {
        Calendar cal = Calendar.getInstance(converter.getOptions().getTimeZone());
        cal.clear();
        cal.setTimeInMillis(epochMilli);
        return cal;
    }

    static Year toYear(Object from, Converter converter) {
        return Year.from(
                ((Calendar) from).toInstant()
                        .atZone(converter.getOptions().getZoneId())
                        .toLocalDate()
        );
    }

    static YearMonth toYearMonth(Object from, Converter converter) {
        return YearMonth.from(
                ((Calendar) from).toInstant()
                        .atZone(converter.getOptions().getZoneId())
                        .toLocalDate()
        );
    }

    static MonthDay toMonthDay(Object from, Converter converter) {
        return MonthDay.from(
                ((Calendar) from).toInstant()
                        .atZone(converter.getOptions().getZoneId())
                        .toLocalDate()
        );
    }

    static String toString(Object from, Converter converter) {
        ZonedDateTime zdt = toZonedDateTime(from, converter);
        String zoneId = zdt.getZone().getId();

        // If the zoneId does NOT contain "/", assume it's an abbreviation.
        if (!zoneId.contains("/")) {
            String fullZone = DateUtilities.ABBREVIATION_TO_TIMEZONE.get(zoneId);
            if (fullZone != null) {
                // Adjust the ZonedDateTime to use the full zone name.
                zdt = zdt.withZoneSameInstant(ZoneId.of(fullZone));
            }
        }

        // Build a formatter with optional fractional seconds.
        // In JDK8, the last parameter of appendFraction is a boolean.
        // With minWidth=0, no output (not even a decimal) is produced when there are no fractional seconds.
        if (zdt.getZone() instanceof ZoneOffset) {
            DateTimeFormatter offsetFormatter = new DateTimeFormatterBuilder()
                    .appendPattern("yyyy-MM-dd'T'HH:mm:ss")
                    .appendFraction(ChronoField.NANO_OF_SECOND, 0, 9, true)
                    .appendPattern("XXX")
                    .toFormatter();
            return offsetFormatter.format(zdt);
        } else {
            DateTimeFormatter zoneFormatter = new DateTimeFormatterBuilder()
                    .appendPattern("yyyy-MM-dd'T'HH:mm:ss")
                    .appendFraction(ChronoField.NANO_OF_SECOND, 0, 9, true)
                    .appendPattern("XXX'['VV']'")
                    .toFormatter();
            return zoneFormatter.format(zdt);
        }
    }

    static Map toMap(Object from, Converter converter) {
        Map target = new LinkedHashMap<>();
        target.put(MapConversions.CALENDAR, toString(from, converter));
        return target;
    }
}