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/*
 * RED5 Open Source Media Server - https://github.com/Red5/
 * 
 * Copyright 2006-2016 by respective authors (see below). All rights reserved.
 * 
 * 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 org.red5.server.scope;

import java.util.Arrays;

import org.apache.commons.lang3.StringUtils;
import org.red5.server.api.scope.IGlobalScope;
import org.red5.server.api.scope.IScope;
import org.red5.server.api.scope.IScopeResolver;
import org.red5.server.api.scope.ScopeType;
import org.red5.server.exception.ScopeException;
import org.red5.server.exception.ScopeNotFoundException;
import org.red5.server.exception.ScopeShuttingDownException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Resolves scopes from path
 */
public class ScopeResolver implements IScopeResolver {

    protected static Logger log = LoggerFactory.getLogger(ScopeResolver.class);

    /**
     * Global scope
     */
    protected IGlobalScope globalScope;

    /**
     * Getter for global scope
     * 
     * @return Global scope
     */
    public IGlobalScope getGlobalScope() {
        return globalScope;
    }

    /**
     * Setter for global scope
     * 
     * @param root
     *            Global scope
     */
    public void setGlobalScope(IGlobalScope root) {
        this.globalScope = root;
    }

    /**
     * Return scope associated with given path
     *
     * @param path
     *            Scope path
     * @return Scope object
     */
    public IScope resolveScope(String path) {
        // start from global scope
        return resolveScope(globalScope, path);
    }

    /**
     * Return scope associated with given path from given root scope.
     *
     * @param root
     *            Scope to start from
     * @param path
     *            Scope path
     * @return Scope object
     */
    public IScope resolveScope(IScope root, String path) {
        log.debug("resolveScope - root: {} path: {}", root, path);
        if (root == null) {
            throw new ScopeException("Null root scope");
        }
        // start from root scope
        IScope scope = root;
        // if there's no path return root scope (e.i. root path scope)
        if (StringUtils.isNotEmpty(path)) {
            // Split path to parts
            final String[] parts = path.split("/");
            log.debug("Split path: {}", Arrays.toString(parts));
            // Iterate thru them, skip empty parts
            for (String child : parts) {
                if (StringUtils.isEmpty(child)) {
                    // skip empty path elements
                    continue;
                }
                // if scope does not exist and we are not in the root, create a child scope
                if (!scope.hasChildScope(child) && !scope.equals(root)) {
                    scope.createChildScope(child);
                }
                // get child scope
                scope = scope.getScope(child);
                // if the scope is null then the room was not found
                if (scope == null) {
                    throw new ScopeNotFoundException(scope, child);
                }
                // some scopes don't implement IScope, such as SharedObjectScope
                if (scope instanceof IScope && scope.getType().equals(ScopeType.APPLICATION) && ((WebScope) scope).isShuttingDown()) {
                    throw new ScopeShuttingDownException(scope);
                }
            }
        }
        return scope;
    }

}