package testcode;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

import java.io.IOException;
import java.util.Objects;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
import com.fasterxml.jackson.databind.deser.std.StdDeserializer;

/*
 * This must be defined first, because in python the ValueDeserializer
 * must be able to refer to this. 
 * This deserializer also needs to refer to the Value class,
 * which is not yet defined. We therefore use 'Value'.
 */
/*#PY 
 * from pyson.Deserializer import Deserializer
 * from decimal import Decimal
 * 
 * class ValueDeserializer (Deserializer):
 *    def deserialize(self, data:object, clas: object) -> 'Value':
 *        if isinstance(data, float) or isinstance(data, int):
 *            return Value(data)
 *        if isinstance(data,str):
 *            return Value(data)
 *        raise ValueError("Expected number or double quoted string but found " + str(data)
 *                            + " of type " + str(type(data)))
 */
class ValueDeserializer extends StdDeserializer<Value> {
	public ValueDeserializer() {
		this(null);
	}

	public ValueDeserializer(Class<?> vc) {
		super(vc);
	}

	@Override
	public Value deserialize(JsonParser jp, DeserializationContext ctxt)
			throws IOException, JsonProcessingException {
		String text = jp.getText();
		switch (jp.currentToken()) {
		case VALUE_NUMBER_FLOAT:
		case VALUE_NUMBER_INT:
			return new Value(Float.parseFloat(text));
		case VALUE_STRING:
			return new Value(text);
		default:
			throw new IOException(
					"Expected number of double quoted string but found " + text
							+ " of type " + jp.currentToken());
		}

	}

}

@JsonDeserialize(using = ValueDeserializer.class)
public class Value {
	private final Object value;

	public Value(Object value) {
		this.value = value;
	}

	public Object getValue() {
		return value;
	}

	/** The test code for Value */
	public static void main(String[] args) throws JsonProcessingException {
		ObjectMapper jackson = new ObjectMapper();
		Value val = new Value(12f);
		System.out.println(jackson.writeValueAsString(val));
		assertEquals(val, jackson.readValue("12", Value.class));
		assertTrue(val.getValue() instanceof Float);
		val = new Value("hallo");
		System.out.println(jackson.writeValueAsString(val));
		assertEquals(val, jackson.readValue("\"hallo\"", Value.class));
	}

	@Override
	public int hashCode() {
		return Objects.hash(value);
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		Value other = (Value) obj;
		return Objects.equals(value, other.value);
	}

	@Override
	public String toString() {
		return "val:" + value;
	}
}