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/*
 * Copyright DataStax, Inc.
 *
 * 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
 *
 * 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 com.datastax.stargate.sdk.utils;

import java.time.LocalDate;
import java.time.format.DateTimeFormatter;

/**
 * Mapping from Time objects to String.
 *
 * @author Cedrick LUNVEN (@clunven)
 */
public class TimeUtils {
    
    private static final LocalDate EPOCH = LocalDate.of(1970, 1, 1);
    
    private static final long MAX_CQL_LONG_VALUE = ((1L << 32) - 1);
    
    private static final long EPOCH_AS_CQL_LONG = (1L << 31);
    
    public static String formatLocalDate(LocalDate value) {
      return DateTimeFormatter.ISO_LOCAL_DATE.format(value);
    }
    
    public static LocalDate parseLocaDate(String value) {
        try {
            return LocalDate.parse(value, DateTimeFormatter.ISO_LOCAL_DATE);
        } catch (RuntimeException e) {
            throw new IllegalArgumentException("Couldn't parse literal, expected ISO-8601 extended local date format (YYYY-MM-DD)");
      }
    }

    public static LocalDate parseLocaDate(long value) {
      int days = cqlDateToDaysSinceEpoch(value);
      return EPOCH.plusDays(days);
    }

    private static int cqlDateToDaysSinceEpoch(long raw) {
      if (raw < 0 || raw > MAX_CQL_LONG_VALUE)
        throw new IllegalArgumentException(
            String.format(
                "Numeric Date literals must be between 0 and %d (got %d)", MAX_CQL_LONG_VALUE, raw));
      return (int) (raw - EPOCH_AS_CQL_LONG);
    }

    
    

}