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/*******************************************************************************
 * Copyright (C) 2020, exense GmbH
 *
 * This file is part of STEP
 *
 * STEP is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * STEP is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with STEP.  If not, see .
 ******************************************************************************/
package step.core.yaml.deserializers;

import com.fasterxml.jackson.core.JacksonException;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.deser.ContextualDeserializer;
import step.core.dynamicbeans.DynamicValue;
import step.core.yaml.YamlFields;

import java.io.IOException;

@StepYamlDeserializerAddOn(targetClasses = {DynamicValue.class})
public class YamlDynamicValueDeserializer extends StepYamlDeserializer> implements ContextualDeserializer {

	private JavaType type;

	public YamlDynamicValueDeserializer() {
	}

	public YamlDynamicValueDeserializer(ObjectMapper yamlObjectMapper) {
		super(yamlObjectMapper);
	}

	@Override
	public JsonDeserializer createContextual(DeserializationContext ctxt, BeanProperty property) throws JsonMappingException {
		this.type = property.getType().containedType(0);
		YamlDynamicValueDeserializer deserializer = new YamlDynamicValueDeserializer();
		deserializer.type = type;
		return deserializer;
	}

	@Override
	public DynamicValue deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException, JacksonException {
		JsonNode node = jp.getCodec().readTree(jp);

		if (node.isContainerNode()) {
			JsonNode expressionNode = node.get(YamlFields.DYN_VALUE_EXPRESSION_FIELD);
			String expression = expressionNode == null ? null : expressionNode.asText();

			if (expression != null) {
				// dynamic value
				return new DynamicValue<>(expression, "");
			} else {
				throw new IllegalStateException("Expression should be defined for dynamic value " + node.toPrettyString());
			}
		} else {
			// 'smart' mode - we can use the value explicitly without nested 'value' node
			return new DynamicValue<>(jp.getCodec().treeToValue(node, type.getRawClass()));
		}

	}

}