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/**
 * Copyright (C) 2015 The Gravitee team (http://gravitee.io)
 *
 * 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.gravitee.gateway.platform;

import io.gravitee.definition.model.flow.Flow;
import io.gravitee.gateway.api.ExecutionContext;
import io.gravitee.gateway.api.buffer.Buffer;
import io.gravitee.gateway.core.processor.EmptyStreamableProcessor;
import io.gravitee.gateway.core.processor.StreamableProcessor;
import io.gravitee.gateway.core.processor.chain.DefaultStreamableProcessorChain;
import io.gravitee.gateway.flow.FlowPolicyResolver;
import io.gravitee.gateway.flow.FlowProvider;
import io.gravitee.gateway.flow.FlowResolver;
import io.gravitee.gateway.flow.policy.FlowResponsePolicyChain;
import io.gravitee.gateway.flow.policy.PolicyChainFactory;
import io.gravitee.gateway.policy.StreamType;
import io.gravitee.gateway.policy.impl.RequestPolicyChain;
import java.util.ArrayList;
import java.util.List;

/**
 * @author Guillaume CUSNIEUX (guillaume.cusnieux at graviteesource.com)
 * @author GraviteeSource Team
 */
public class OrganizationFlowProvider implements FlowProvider {

    private final StreamType streamType;

    private final FlowResolver flowResolver;

    private PolicyChainFactory policyChainFactory;

    public OrganizationFlowProvider(
        final StreamType streamType,
        final FlowResolver flowResolver,
        final PolicyChainFactory policyChainFactory
    ) {
        this.streamType = streamType;
        this.flowResolver = flowResolver;
        this.policyChainFactory = policyChainFactory;
    }

    @Override
    public StreamableProcessor provide(ExecutionContext context) {
        List flows = flowResolver.resolve(context);

        if (flows != null && !flows.isEmpty()) {
            final List> chain = new ArrayList<>(flows.size());

            for (Flow flow : flows) {
                chain.add(
                    policyChainFactory.create(
                        new FlowPolicyResolver(flow).resolve(streamType, context),
                        streamType,
                        context,
                        policies ->
                            streamType == StreamType.ON_REQUEST
                                ? RequestPolicyChain.create(policies, context)
                                : FlowResponsePolicyChain.create(policies, context)
                    )
                );
            }

            return new DefaultStreamableProcessorChain<>(chain);
        }

        return new EmptyStreamableProcessor<>();
    }
}