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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.plugins.views.functions;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;
import step.core.collections.serialization.DottedKeyMap;

import java.io.IOException;
import java.util.Map;

public class ErrorMapDeserializer extends JsonDeserializer> {

	private ObjectMapper mapper;

	public ErrorMapDeserializer() {
		super();
		mapper = new ObjectMapper();
		mapper.enableDefaultTyping();
	}

	private String decodeKey(String key) {
		return key.replace("\\\\u002e", ".").replace("\\\\u0024", "\\$").replace("\\\\\\\\", "\\\\");
	}

	@Override
	public DottedKeyMap deserialize(JsonParser jp, DeserializationContext ctxt)
			throws IOException, JsonProcessingException {
		JsonNode node = jp.readValueAsTree();

		DottedKeyMap result = new DottedKeyMap<>();
		ObjectNode o = (ObjectNode) node;
		o.fields().forEachRemaining(e -> {
			String key = e.getKey();
			JsonNode eNode = e.getValue();
			try {
				result.put(decodeKey(key), mapper.treeToValue(eNode, Object.class));
			} catch (Throwable ex) {
				// Ignore these exception as it can be a ClassNotFoundException
			}
		});

		return result;
	}
}