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/*
 * Copyright (C) 2016 Red Hat, Inc.
 *
 * Licensed 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 io.syndesis.connector.rest.swagger;

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

import io.syndesis.common.model.DataShape;
import io.syndesis.common.model.DataShapeKinds;
import io.syndesis.common.model.OutputDataShapeAware;
import io.syndesis.integration.component.proxy.ComponentProxyComponent;
import io.syndesis.integration.component.proxy.ComponentProxyCustomizer;
import io.syndesis.integration.component.proxy.Processors;

import org.apache.camel.util.ObjectHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.fasterxml.jackson.databind.JsonNode;

public final class ResponseCustomizer implements ComponentProxyCustomizer, OutputDataShapeAware {

    private static final Logger LOG = LoggerFactory.getLogger(ResponseCustomizer.class);

    private DataShape dataShape;

    private boolean isUnifiedDataShape;

    @Override
    public void customize(final ComponentProxyComponent component, final Map options) {
        if (isUnifiedDataShape) {
            Processors.addAfterProducer(component, new ResponsePayloadConverter(dataShape));
        }
    }

    @Override
    public DataShape getOutputDataShape() {
        return dataShape;
    }

    @Override
    public void setOutputDataShape(final DataShape dataShape) {
        this.dataShape = dataShape;

        isUnifiedDataShape = isUnifiedDataShape(dataShape);
    }

    static boolean isNullNode(final JsonNode node) {
        return node == null || node.isNull();
    }

    static boolean isUnifiedDataShape(final DataShape dataShape) {
        if (dataShape == null || dataShape.getKind() != DataShapeKinds.JSON_SCHEMA) {
            return false;
        }

        final String specification = dataShape.getSpecification();
        if (ObjectHelper.isEmpty(specification)) {
            return false;
        }

        final JsonNode jsonSchema;
        try {
            jsonSchema = PayloadConverterBase.MAPPER.readTree(specification);
        } catch (final IOException e) {
            LOG.warn("Unable to parse data shape as a JSON: {}", e.getMessage());
            LOG.debug("Failed parsing JSON datashape: `{}`", specification, e);
            return false;
        }

        final JsonNode id = jsonSchema.get("$id");

        return !isNullNode(id) && "io:syndesis:wrapped".equals(id.asText());
    }
}