/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2014 Red Hat, Inc., and individual contributors
 * as indicated by the @author tags.
 *
 * 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.undertow.servlet.core;

import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;

import io.undertow.servlet.UndertowServletMessages;
import io.undertow.servlet.api.DeploymentInfo;
import io.undertow.servlet.api.DeploymentManager;
import io.undertow.servlet.api.ServletContainer;

/**
 * The manager for all servlet deployments.
 *
 * @author Stuart Douglas
 */
public class ServletContainerImpl implements ServletContainer {


    private final Map<String, DeploymentManager> deployments = Collections.synchronizedMap(new HashMap<String, DeploymentManager>());
    private final Map<String, DeploymentManager> deploymentsByPath = Collections.synchronizedMap(new HashMap<String, DeploymentManager>());

    @Override
    public Collection<String> listDeployments() {
        return new HashSet<>(deployments.keySet());
    }

    @Override
    public DeploymentManager addDeployment(final DeploymentInfo deployment) {
        final DeploymentInfo dep = deployment.clone();
        DeploymentManager deploymentManager = new DeploymentManagerImpl(dep, this);
        deployments.put(dep.getDeploymentName(), deploymentManager);
        deploymentsByPath.put(dep.getContextPath(), deploymentManager);
        return deploymentManager;
    }

    @Override
    public DeploymentManager getDeployment(final String deploymentName) {
        return deployments.get(deploymentName);
    }

    @Override
    public void removeDeployment(final DeploymentInfo deploymentInfo) {
        final DeploymentManager deploymentManager = deployments.get(deploymentInfo.getDeploymentName());
        if (deploymentManager.getState() != DeploymentManager.State.UNDEPLOYED) {
            throw UndertowServletMessages.MESSAGES.canOnlyRemoveDeploymentsWhenUndeployed(deploymentManager.getState());
        }
        deployments.remove(deploymentInfo.getDeploymentName());
        deploymentsByPath.remove(deploymentInfo.getContextPath());
    }

    @Override
    public DeploymentManager getDeploymentByPath(final String path) {

        DeploymentManager exact = deploymentsByPath.get(path.isEmpty() ? "/" : path);
        if (exact != null) {
            return exact;
        }
        int length = path.length();
        int pos = length;

        while (pos > 1) {
            --pos;
            if (path.charAt(pos) == '/') {
                String part = path.substring(0, pos);
                DeploymentManager deployment = deploymentsByPath.get(part);
                if (deployment != null) {
                    return deployment;
                }
            }
        }
        return deploymentsByPath.get("/");
    }
}