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/**
 * Copyright (c) 2013, impossibl.com
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  * Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *  * Neither the name of impossibl.com nor the names of its contributors may
 *    be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
package com.impossibl.postgres.datetime;

import java.time.chrono.IsoChronology;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeFormatterBuilder;
import java.time.temporal.Temporal;
import java.time.temporal.TemporalAccessor;

import static java.time.temporal.ChronoField.HOUR_OF_DAY;
import static java.time.temporal.ChronoField.MINUTE_OF_HOUR;
import static java.time.temporal.ChronoField.NANO_OF_SECOND;
import static java.time.temporal.ChronoField.OFFSET_SECONDS;
import static java.time.temporal.ChronoField.SECOND_OF_MINUTE;

public class ISOTimeFormat implements DateTimeFormat {

  private Parser parser = new Parser();
  private Printer printer = new Printer();

  @Override
  public Parser getParser() {
    return parser;
  }

  @Override
  public Printer getPrinter() {
    return printer;
  }

  private static final DateTimeFormatter PARSE_FMT =
      new DateTimeFormatterBuilder()
          .parseCaseInsensitive()
          .parseLenient()
          .appendValue(HOUR_OF_DAY, 2)
          .appendLiteral(':')
          .appendValue(MINUTE_OF_HOUR, 2)
          .optionalStart()
          .appendLiteral(':')
          .appendValue(SECOND_OF_MINUTE, 2)
          .optionalStart()
          .appendFraction(NANO_OF_SECOND, 0, 9, true)
          .optionalEnd()
          .optionalEnd()
          .optionalStart()
          .appendOffset("+HH:MM:ss", "+00")
          .optionalEnd()
          .optionalStart()
          .appendOffset("+HH:mm", "+00")
          .optionalEnd()
          .toFormatter()
          .withChronology(IsoChronology.INSTANCE);

  private static final DateTimeFormatter PRINT_FMT =
      new DateTimeFormatterBuilder()
          .parseCaseInsensitive()
          .parseLenient()
          .appendValue(HOUR_OF_DAY, 2)
          .appendLiteral(':')
          .appendValue(MINUTE_OF_HOUR, 2)
          .optionalStart()
          .appendLiteral(':')
          .appendValue(SECOND_OF_MINUTE, 2)
          .optionalStart()
          .appendFraction(NANO_OF_SECOND, 0, 9, true)
          .optionalEnd()
          .optionalEnd()
          .optionalStart()
          .appendOffset("+HH:MM:ss", "+00")
          .optionalEnd()
          .toFormatter()
          .withChronology(IsoChronology.INSTANCE);

  private static final DateTimeFormatter PRINT_FMT2 =
      new DateTimeFormatterBuilder()
          .parseCaseInsensitive()
          .parseLenient()
          .appendValue(HOUR_OF_DAY, 2)
          .appendLiteral(':')
          .appendValue(MINUTE_OF_HOUR, 2)
          .optionalStart()
          .appendLiteral(':')
          .appendValue(SECOND_OF_MINUTE, 2)
          .optionalStart()
          .appendFraction(NANO_OF_SECOND, 0, 9, true)
          .optionalEnd()
          .optionalEnd()
          .optionalStart()
          .appendOffset("+HH:mm", "+00")
          .optionalEnd()
          .toFormatter()
          .withChronology(IsoChronology.INSTANCE);

  static class Parser implements DateTimeFormat.Parser {

    @Override
    public TemporalAccessor parse(CharSequence time) {
      return PARSE_FMT.parse(time);
    }

  }

  static class Printer implements DateTimeFormat.Printer {

    @Override
    public String format(Temporal value) {
      if (value.isSupported(OFFSET_SECONDS) && value.get(OFFSET_SECONDS) % 3600 != 0)
        return PRINT_FMT.format(value);
      else
        return PRINT_FMT2.format(value);
    }

  }

}