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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.kyuubi.jdbc.hive.common;

import java.time.*;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeFormatterBuilder;
import java.time.format.DateTimeParseException;
import java.time.format.TextStyle;
import java.time.temporal.ChronoField;
import java.time.temporal.TemporalAccessor;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class TimestampTZUtil {
  private static final LocalTime DEFAULT_LOCAL_TIME = LocalTime.of(0, 0);
  private static final Pattern SINGLE_DIGIT_PATTERN = Pattern.compile("[\\+-]\\d:\\d\\d");

  static final DateTimeFormatter FORMATTER;

  static {
    DateTimeFormatterBuilder builder = new DateTimeFormatterBuilder();
    // Date part
    builder.append(DateTimeFormatter.ofPattern("yyyy-MM-dd"));
    // Time part
    builder
        .optionalStart()
        .appendLiteral(" ")
        .append(DateTimeFormatter.ofPattern("HH:mm:ss"))
        .optionalStart()
        .appendFraction(ChronoField.NANO_OF_SECOND, 1, 9, true)
        .optionalEnd()
        .optionalEnd();

    // Zone part
    builder.optionalStart().appendLiteral(" ").optionalEnd();
    builder.optionalStart().appendZoneText(TextStyle.NARROW).optionalEnd();

    FORMATTER = builder.toFormatter();
  }

  public static TimestampTZ parse(String s) {
    return parse(s, null);
  }

  public static TimestampTZ parse(String s, ZoneId defaultTimeZone) {
    // need to handle offset with single digital hour, see JDK-8066806
    s = handleSingleDigitHourOffset(s);
    ZonedDateTime zonedDateTime;
    try {
      zonedDateTime = ZonedDateTime.parse(s, FORMATTER);
    } catch (DateTimeParseException e) {
      // try to be more tolerant
      // if the input is invalid instead of incomplete, we'll hit exception here again
      TemporalAccessor accessor = FORMATTER.parse(s);
      // LocalDate must be present
      LocalDate localDate = LocalDate.from(accessor);
      LocalTime localTime;
      ZoneId zoneId;
      try {
        localTime = LocalTime.from(accessor);
      } catch (DateTimeException e1) {
        localTime = DEFAULT_LOCAL_TIME;
      }
      try {
        zoneId = ZoneId.from(accessor);
      } catch (DateTimeException e2) {
        if (defaultTimeZone == null) {
          throw new DateTimeException("Time Zone not available");
        }
        zoneId = defaultTimeZone;
      }
      zonedDateTime = ZonedDateTime.of(localDate, localTime, zoneId);
    }

    if (defaultTimeZone == null) {
      return new TimestampTZ(zonedDateTime);
    }
    return new TimestampTZ(zonedDateTime.withZoneSameInstant(defaultTimeZone));
  }

  private static String handleSingleDigitHourOffset(String s) {
    Matcher matcher = SINGLE_DIGIT_PATTERN.matcher(s);
    if (matcher.find()) {
      int index = matcher.start() + 1;
      s = s.substring(0, index) + "0" + s.substring(index);
    }
    return s;
  }

  // Converts Date to TimestampTZ.
  public static TimestampTZ convert(Date date, ZoneId defaultTimeZone) {
    return parse(date.toString(), defaultTimeZone);
  }

  // Converts Timestamp to TimestampTZ.
  public static TimestampTZ convert(Timestamp ts, ZoneId defaultTimeZone) {
    return parse(ts.toString(), defaultTimeZone);
  }
}