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 * Copyright 2013 FasterXML.com
 *
 * 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.
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package com.fasterxml.jackson.datatype.jsr310.deser;

import java.io.IOException;
import java.time.DateTimeException;
import java.time.Instant;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonToken;
import com.fasterxml.jackson.core.JsonTokenId;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JsonDeserializer;

Deserializer for Java 8 temporal LocalDateTimes. 
Author:
Nick Williams
Since:
2.2.0/**
 * Deserializer for Java 8 temporal {@link LocalDateTime}s.
 *
 * @author Nick Williams
 * @since 2.2.0
 */
public class LocalDateTimeDeserializer
    extends JSR310DateTimeDeserializerBase<LocalDateTime>
{
    private static final long serialVersionUID = 1L;

    private static final DateTimeFormatter DEFAULT_FORMATTER = DateTimeFormatter.ISO_LOCAL_DATE_TIME;

    public static final LocalDateTimeDeserializer INSTANCE = new LocalDateTimeDeserializer();

    private LocalDateTimeDeserializer() {
        this(DEFAULT_FORMATTER);
    }

    public LocalDateTimeDeserializer(DateTimeFormatter formatter) {
        super(LocalDateTime.class, formatter);
    }

    @Override
    protected JsonDeserializer<LocalDateTime> withDateFormat(DateTimeFormatter formatter) {
        return new LocalDateTimeDeserializer(formatter);
    }

    @Override
    public LocalDateTime deserialize(JsonParser parser, DeserializationContext context) throws IOException
    {
        if (parser.hasTokenId(JsonTokenId.ID_STRING)) {
            String string = parser.getText().trim();
            if (string.length() == 0) {
                return null;
            }

            try {
	            if (_formatter == DEFAULT_FORMATTER) {
	                // JavaScript by default includes time and zone in JSON serialized Dates (UTC/ISO instant format).
	                if (string.length() > 10 && string.charAt(10) == 'T') {
	                   if (string.endsWith("Z")) {
	                       return LocalDateTime.ofInstant(Instant.parse(string), ZoneOffset.UTC);
	                   } else {
	                       return LocalDateTime.parse(string, DEFAULT_FORMATTER);
	                   }
	                }
	            }

                return LocalDateTime.parse(string, _formatter);
            } catch (DateTimeException e) {
                _rethrowDateTimeException(parser, context, e, string);
            }
        }
        if (parser.isExpectedStartArrayToken()) {
            JsonToken t = parser.nextToken();
            if (t == JsonToken.END_ARRAY) {
                return null;
            }
            if ((t == JsonToken.VALUE_STRING || t == JsonToken.VALUE_EMBEDDED_OBJECT)
                    && context.isEnabled(DeserializationFeature.UNWRAP_SINGLE_VALUE_ARRAYS)) {
                final LocalDateTime parsed = deserialize(parser, context);
                if (parser.nextToken() != JsonToken.END_ARRAY) {
                    handleMissingEndArrayForSingle(parser, context);
                }
                return parsed;            
            }
            if (t == JsonToken.VALUE_NUMBER_INT) {
                LocalDateTime result;

                int year = parser.getIntValue();
                int month = parser.nextIntValue(-1);
                int day = parser.nextIntValue(-1);
                int hour = parser.nextIntValue(-1);
                int minute = parser.nextIntValue(-1);

                t = parser.nextToken();
                if (t == JsonToken.END_ARRAY) {
                    result = LocalDateTime.of(year, month, day, hour, minute);
                } else {
                    int second = parser.getIntValue();
                    t = parser.nextToken();
                    if (t == JsonToken.END_ARRAY) {
                        result = LocalDateTime.of(year, month, day, hour, minute, second);
                    } else {
                        int partialSecond = parser.getIntValue();
                        if (partialSecond < 1_000 &&
                                !context.isEnabled(DeserializationFeature.READ_DATE_TIMESTAMPS_AS_NANOSECONDS))
                            partialSecond *= 1_000_000; // value is milliseconds, convert it to nanoseconds
                        if (parser.nextToken() != JsonToken.END_ARRAY) {
                            throw context.wrongTokenException(parser, handledType(), JsonToken.END_ARRAY,
                                    "Expected array to end");
                        }
                        result = LocalDateTime.of(year, month, day, hour, minute, second, partialSecond);
                    }
                }
                return result;
            }
            context.reportInputMismatch(handledType(),
                    "Unexpected token (%s) within Array, expected VALUE_NUMBER_INT",
                    t);
        }
        if (parser.hasToken(JsonToken.VALUE_EMBEDDED_OBJECT)) {
            return (LocalDateTime) parser.getEmbeddedObject();
        }
        if (parser.hasToken(JsonToken.VALUE_NUMBER_INT)) {
            _throwNoNumericTimestampNeedTimeZone(parser, context);
        }
        throw context.wrongTokenException(parser, handledType(), JsonToken.VALUE_STRING,
                "Expected array or string.");
    }
}