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/*
 *  Licensed to GraphHopper GmbH under one or more contributor
 *  license agreements. See the NOTICE file distributed with this work for
 *  additional information regarding copyright ownership.
 *
 *  GraphHopper GmbH licenses this file to you 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.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package com.graphhopper.jackson;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.node.ArrayNode;
import com.fasterxml.jackson.databind.node.JsonNodeFactory;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.graphhopper.util.exceptions.GHException;

import java.io.IOException;
import java.util.List;

public class MultiExceptionSerializer extends JsonSerializer {

    @Override
    public void serialize(MultiException e, JsonGenerator jsonGenerator, SerializerProvider serializerProvider) throws IOException {
        List errors = e.getErrors();
        ObjectNode json = JsonNodeFactory.instance.objectNode();
        json.put("message", getMessage(errors.get(0)));
        ArrayNode errorHintList = json.putArray("hints");
        for (Throwable t : errors) {
            ObjectNode error = errorHintList.addObject();
            error.put("message", getMessage(t));
            error.put("details", t.getClass().getName());
            if (t instanceof GHException) {
                ((GHException) t).getDetails().forEach(error::putPOJO);
            }
        }
        jsonGenerator.writeObject(json);
    }

    private static String getMessage(Throwable t) {
        if (t.getMessage() == null)
            return t.getClass().getSimpleName();
        else
            return t.getMessage();
    }

}