/*
 * 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 java.util.List;
import java.util.stream.Collectors;

import org.springframework.cloud.contract.spec.internal.ExecutionProperty;
import org.springframework.cloud.contract.spec.internal.MatchingStrategy;
import org.springframework.cloud.contract.spec.internal.QueryParameter;
import org.springframework.cloud.contract.spec.internal.Request;
import org.springframework.cloud.contract.spec.internal.Url;
import org.springframework.cloud.contract.verifier.file.SingleContractMetadata;
import org.springframework.cloud.contract.verifier.util.MapConverter;

class MockMvcQueryParamsWhen implements When, MockMvcAcceptor, QueryParamsResolver {

	private static final String QUERY_PARAM_METHOD = "queryParam";

	private final BlockBuilder blockBuilder;

	private final BodyParser bodyParser;

	MockMvcQueryParamsWhen(BlockBuilder blockBuilder, BodyParser bodyParser) {
		this.blockBuilder = blockBuilder;
		this.bodyParser = bodyParser;
	}

	@Override
	public MethodVisitor<When> apply(SingleContractMetadata metadata) {
		Request request = metadata.getContract().getRequest();
		Url url = getUrl(request);
		addQueryParameters(url);
		return this;
	}

	private Url getUrl(Request request) {
		if (request.getUrl() != null) {
			return request.getUrl();
		}
		if (request.getUrlPath() != null) {
			return request.getUrlPath();
		}
		throw new IllegalStateException("URL is not set!");
	}

	private void addQueryParameters(Url buildUrl) {
		List<QueryParameter> queryParameters = buildUrl.getQueryParameters().getParameters().stream()
				.filter(this::allowedQueryParameter).collect(Collectors.toList());
		Iterator<QueryParameter> iterator = queryParameters.iterator();
		while (iterator.hasNext()) {
			QueryParameter parameter = iterator.next();
			String text = addQueryParameter(parameter);
			if (iterator.hasNext()) {
				this.blockBuilder.addLine(text);
			}
			else {
				this.blockBuilder.addIndented(text);
			}
		}
	}

	private boolean allowedQueryParameter(Object o) {
		if (o instanceof QueryParameter) {
			return allowedQueryParameter(((QueryParameter) o).getServerValue());
		}
		else if (o instanceof MatchingStrategy) {
			return !MatchingStrategy.Type.ABSENT.equals(((MatchingStrategy) o).getType());
		}
		return true;
	}

	private String addQueryParameter(QueryParameter queryParam) {
		String queryParamValue = getQueryParamValue(queryParam);
		return "." + QUERY_PARAM_METHOD + "(" + this.bodyParser.quotedLongText(queryParam.getName()) + ","
				+ queryParamValue + ")";
	}

	private String getQueryParamValue(QueryParameter queryParam) {
		Object serverValue = queryParam.getServerValue();
		if (serverValue instanceof ExecutionProperty) {
			return ((ExecutionProperty) serverValue).getExecutionCommand();
		}
		return this.bodyParser.quotedLongText(resolveParamValue(MapConverter.getTestSideValuesForNonBody(queryParam)));
	}

	@Override
	public boolean accept(SingleContractMetadata metadata) {
		Request request = metadata.getContract().getRequest();
		Url url = getUrl(request);
		return url.getQueryParameters() != null;
	}

}
