package com.fasterxml.jackson.datatype.jdk8;

import java.io.IOException;
import java.util.OptionalInt;

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;

public class OptionalIntDeserializer extends BaseScalarOptionalDeserializer<OptionalInt>
{
    private static final long serialVersionUID = 1L;

    static final OptionalIntDeserializer INSTANCE = new OptionalIntDeserializer();

    public OptionalIntDeserializer() {
        super(OptionalInt.class, OptionalInt.empty());
    }

    @Override
    public OptionalInt deserialize(JsonParser p, DeserializationContext ctxt) throws IOException {
        // minor optimization, first, for common case
        if (p.hasToken(JsonToken.VALUE_NUMBER_INT)) {
            return OptionalInt.of(p.getIntValue());
        }
        switch (p.getCurrentTokenId()) {
        case JsonTokenId.ID_STRING:
            String text = p.getText().trim();
            if ((text.length() == 0)) {
                _coerceEmptyString(ctxt, false);
                return _empty;
            }
            if (_hasTextualNull(text)) {
                _coerceTextualNull(ctxt, false);
                return _empty;
            }
            return OptionalInt.of(_parseIntPrimitive(ctxt, text));
        case JsonTokenId.ID_NUMBER_FLOAT:
            if (!ctxt.isEnabled(DeserializationFeature.ACCEPT_FLOAT_AS_INT)) {
                _failDoubleToIntCoercion(p, ctxt, "int");
            }
            return OptionalInt.of(p.getValueAsInt());
        case JsonTokenId.ID_NULL:
            return _empty;
        case JsonTokenId.ID_START_ARRAY:
            if (ctxt.isEnabled(DeserializationFeature.UNWRAP_SINGLE_VALUE_ARRAYS)) {
                p.nextToken();
                final OptionalInt parsed = deserialize(p, ctxt);
                _verifyEndArrayForSingle(p, ctxt);
                return parsed;            
            }
            break;
        default:
        }
        return (OptionalInt) ctxt.handleUnexpectedToken(_valueClass, p);
    }
}