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/*
 * Copyright 2018 Virtualan Contributors (https://virtualan.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.virtualan.api;

import io.virtualan.core.model.VirtualServiceKeyValue;
import java.lang.reflect.Method;
import javax.ws.rs.Path;
import org.springframework.web.bind.annotation.RequestMapping;

/**
 * This ApiResource class identify the resource name.
 *
 * @author Elan Thangamani
 **/

public class ApiResource {

	private ApiResource() {

	}

	public static String getResourceParent(Class clazz) {
		String parentPath = null;
		if (clazz.isAnnotationPresent(RequestMapping.class)) {
			RequestMapping requestMapping = (RequestMapping) clazz.getAnnotation(RequestMapping.class);
			if (requestMapping.value().length == 1) {
				parentPath = requestMapping.value()[0];
			}
		} else if (clazz.isAnnotationPresent(Path.class)) {
			Path path = (Path) clazz.getAnnotation(Path.class);
			if (path != null) {
				parentPath = path.value();
			}
		}
		if (parentPath != null && parentPath.contains("/")) {
			String[] resources = parentPath.split("/");
			return resources.length >= 1 && resources[1].length() > 1 ? resources[1] : null;
		}
		return null;
	}

	public static String getResource(Class clazz) {
		String parentPath = null;
		parentPath = getParentPath(clazz, parentPath);
		if (parentPath != null && parentPath.contains("/")) {
			return parentPath;
		}
		return null;
	}

	public static String getParentPath(Class clazz, String parentPath) {
		if (clazz.isAnnotationPresent(RequestMapping.class)) {
			RequestMapping requestMapping = (RequestMapping) clazz.getAnnotation(RequestMapping.class);
			if (requestMapping.value().length == 1) {
				parentPath = requestMapping.value()[0];
			}
		} else if (clazz.isAnnotationPresent(Path.class)) {
			Path path = (Path) clazz.getAnnotation(Path.class);
			if (path != null) {
				parentPath = path.value();
			}
		}
		return parentPath;
	}


	public static String getResource(Method method) {
		VirtualServiceKeyValue virtualServiceKeyValue = ApiMethod.getApiMethodParamAndURL(method);
		if (virtualServiceKeyValue.getValue() != null) {
			return getResourceByURL(virtualServiceKeyValue.getValue());
		}
		return null;
	}

	public static String getResourceByURL(String url) {
		if (url != null && url.length() > 0) {
			int index = url.indexOf('/', 1) == -1 ? url.length() : url.indexOf('/', 1);
			url = '/' == url.charAt(0) ? url.substring(1, index) : url.substring(0, index);
			return url;
		}
		return null;
	}

}