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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 com.impossibl.postgres.datetime.instants.Instant;

import static com.impossibl.postgres.datetime.FormatUtils.checkOffset;
import static com.impossibl.postgres.datetime.FormatUtils.parseInt;

import java.util.Calendar;
import java.util.Map;
import java.util.TimeZone;

import static java.util.concurrent.TimeUnit.MICROSECONDS;
import static java.util.concurrent.TimeUnit.MILLISECONDS;

public class ISOTimeFormat implements DateTimeFormat {

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

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

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


  static final String GMT_ID = "GMT";

  static class Parser implements DateTimeFormat.Parser {

    @Override
    public int parse(String date, int offset, Map pieces) {

      try {

        int[] parseResult = new int[1];

        // extract hours, minutes, seconds and milliseconds
        offset = parseInt(date, offset, parseResult);
        checkOffset(date, offset, ':');
        pieces.put(HOUR_PIECE, parseResult[0]);

        offset = parseInt(date, offset + 1, parseResult);
        checkOffset(date, offset, '\0');
        pieces.put(MINUTE_PIECE, parseResult[0]);

        //Optional seconds
        if (offset < date.length()) {
          checkOffset(date, offset, ':');

          offset = parseInt(date, offset + 1, parseResult);
          checkOffset(date, offset, '\0');
          pieces.put(SECOND_PIECE, parseResult[0]);

          //Optional fraction
          if (offset < date.length()) {

            if (date.charAt(offset) == '.') {

              checkOffset(date, offset, '.');

              int nanosStart = offset + 1;
              offset = parseInt(date, nanosStart, parseResult);
              checkOffset(date, offset, '\0');

              int nanoDigits = offset - nanosStart;
              if (nanoDigits > 9) {
                return ~nanosStart;
              }

              int nanos = parseResult[0] * (int)Math.pow(10, 9 - nanoDigits);
              pieces.put(NANOSECOND_PIECE, nanos);

            }
          }
        }

        // extract timezone
        if (offset < date.length()) {
          String timeZoneId = null;
          char timeZoneIndicator = date.charAt(offset);
          if (timeZoneIndicator == '+' || timeZoneIndicator == '-') {
            timeZoneId = GMT_ID + date.substring(offset);
          }
          else if (timeZoneIndicator == 'Z') {
            timeZoneId = GMT_ID;
          }

          if (timeZoneId != null) {
            pieces.put(ZONE_PIECE, timeZoneId);
          }
        }

      }
      catch (IndexOutOfBoundsException | IllegalArgumentException e) {
        // Ignore
      }

      return offset;
    }

  }

  static class Printer implements DateTimeFormat.Printer {

    @Override
    public String format(Instant instant) {

      TimeZone zone = instant.getZone();
      if (zone == null) {
        zone = TimeZone.getTimeZone("UTC");
      }

      Calendar cal = Calendar.getInstance(zone);
      cal.setTimeInMillis(MICROSECONDS.toMillis(instant.getMicrosUTC()));

      int hour = cal.get(Calendar.HOUR_OF_DAY);
      int minute = cal.get(Calendar.MINUTE);
      int second = cal.get(Calendar.SECOND);
      int micros = (int) (instant.getMicrosLocal() - MILLISECONDS.toMicros(MICROSECONDS.toMillis(instant.getMicrosLocal())));

      String hourString;
      String minuteString;
      String secondString;
      String microsString;
      String zeros = "000000000";
      StringBuffer timestampBuf;

      if (hour < 10) {
        hourString = "0" + hour;
      }
      else {
        hourString = Integer.toString(hour);
      }
      if (minute < 10) {
        minuteString = "0" + minute;
      }
      else {
        minuteString = Integer.toString(minute);
      }
      if (second < 10) {
        secondString = "0" + second;
      }
      else {
        secondString = Integer.toString(second);
      }
      if (micros == 0) {
        microsString = "0";
      }
      else {
        microsString = Integer.toString(micros);

        // Add leading zeros
        microsString = zeros.substring(0, (6 - microsString.length())) + microsString;

        // Truncate trailing zeros
        char[] microsChar = new char[microsString.length()];
        microsString.getChars(0, microsString.length(), microsChar, 0);
        int truncIndex = 5;
        while (microsChar[truncIndex] == '0') {
          truncIndex--;
        }

        microsString = new String(microsChar, 0, truncIndex + 1);
      }

      // do a string buffer here instead.
      timestampBuf = new StringBuffer(20 + microsString.length());
      timestampBuf.append(hourString);
      timestampBuf.append(":");
      timestampBuf.append(minuteString);
      timestampBuf.append(":");
      timestampBuf.append(secondString);
      timestampBuf.append(".");
      timestampBuf.append(microsString);

      if (instant.getZone() != null) {
        long zoneOff = MILLISECONDS.toHours(instant.getZoneOffsetMillis());
        if (zoneOff > 0)
          timestampBuf.append("+");
        timestampBuf.append(zoneOff);
      }

      return (timestampBuf.toString());
    }

  }

}