/*
 * Copyright 2013-2020 the original author or authors.
 *
 * 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
 *
 *      https://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 org.springframework.cloud.contract.verifier.builder;

import java.util.Iterator;

import org.springframework.cloud.contract.spec.internal.Header;
import org.springframework.cloud.contract.spec.internal.Headers;
import org.springframework.cloud.contract.spec.internal.MatchingStrategy;
import org.springframework.cloud.contract.spec.internal.Request;
import org.springframework.cloud.contract.verifier.file.SingleContractMetadata;
import org.springframework.cloud.contract.verifier.util.MapConverter;

class MockMvcHeadersGiven implements Given {

	private final BlockBuilder blockBuilder;

	MockMvcHeadersGiven(BlockBuilder blockBuilder) {
		this.blockBuilder = blockBuilder;
	}

	@Override
	public MethodVisitor<Given> apply(SingleContractMetadata metadata) {
		processInput(this.blockBuilder, metadata.getContract().getRequest().getHeaders());
		return this;
	}

	private void processInput(BlockBuilder bb, Headers headers) {
		Iterator<Header> iterator = headers.getEntries().iterator();
		while (iterator.hasNext()) {
			Header header = iterator.next();
			if (ofAbsentType(header)) {
				continue;
			}
			if (iterator.hasNext()) {
				bb.addLine(string(header));
			}
			else {
				bb.addIndented(string(header));
			}
		}
	}

	private String string(Header header) {
		return ".header("
				+ ContentHelper.getTestSideForNonBodyValue(header.getName()) + ", " + ContentHelper
						.getTestSideForNonBodyValue(MapConverter.getTestSideValuesForNonBody(header.getServerValue()))
				+ ")";
	}

	private boolean ofAbsentType(Header header) {
		return header.getServerValue() instanceof MatchingStrategy
				&& MatchingStrategy.Type.ABSENT.equals(((MatchingStrategy) header.getServerValue()).getType());
	}

	@Override
	public boolean accept(SingleContractMetadata metadata) {
		Request request = metadata.getContract().getRequest();
		return request != null && request.getHeaders() != null;
	}

}
