/**
 * Copyright (c) 2017 Contributors to the Eclipse Foundation
 * Copyright 2017 SmartBear Software
 * <p>
 * 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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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.eclipse.microprofile.openapi.models;

import java.util.Map;

/**
 * Paths
 * <p>
 * Holds the relative paths to the individual endpoints and their operations. The path is appended to the URL from the
 * Server Object in order to construct the full URL. The Paths MAY be empty, due to
 * <a href= "https://github.com/OAI/OpenAPI-Specification/blob/master/versions/3.0.0.md#security-filtering">security
 * constraints</a>.
 * <p>
 *
 * @see <a href= "https://github.com/OAI/OpenAPI-Specification/blob/master/versions/3.0.0.md#pathsObject"> OpenAPI
 *      Specification Paths Object</a>
 */
public interface Paths extends Constructible, Extensible<Paths> {

    /**
     * Adds the given path item to this Paths and return this instance of Paths
     *
     * @param name
     *            a path name in the format valid for a Paths object. The field name MUST begin with a slash.
     * @param item
     *            the path item added to the list of paths. null values will be rejected (implementation will throw an
     *            exception) or ignored.
     * @return the current Paths instance
     */
    Paths addPathItem(String name, PathItem item);

    /**
     * Removes the given path item to this Paths.
     *
     * @param name
     *            a path name that will be removed.
     */
    void removePathItem(String name);

    /**
     * Returns a copy map (potentially immutable) of the path items.
     *
     * @return all items
     */
    Map<String, PathItem> getPathItems();

    /**
     * Set the path items map to this Paths
     *
     * @param items
     *            a map containing the list of paths. Keys MUST begin with a slash.
     */
    void setPathItems(Map<String, PathItem> items);

    /**
     * Check whether a path item is present in the map. This is a convenience method for
     * <code>getPathItems().containsKey(name)</code>
     *
     * @param name
     *            a path name in the format valid for a Paths object.
     * @return a boolean to indicate if the path item is present or not.
     */
    default boolean hasPathItem(String name) {
        Map<String, PathItem> map = getPathItems();
        if (map == null) {
            return false;
        }
        return map.containsKey(name);
    }

    /**
     * Returns a path item for a given name. This is a convenience method for <code>getPathItems().get(name)</code>
     *
     * @param name
     *            a path name in the format valid for a Paths object.
     * @return the corresponding path item or null.
     */
    default PathItem getPathItem(String name) {
        Map<String, PathItem> map = getPathItems();
        if (map == null) {
            return null;
        }
        return map.get(name);
    }

}