/*
 * Copyright 2007 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
 *
 *      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.wamblee.system.core;

import org.wamblee.system.core.AbstractComponent;
import org.wamblee.system.core.DefaultProvidedInterface;
import org.wamblee.system.core.ProvidedInterface;
import org.wamblee.system.core.RequiredInterface;

import org.wamblee.test.EventTracker;

import javax.sql.DataSource;


/**
 * DOCUMENT ME!
 *
 * @author $author$
 * @version $Revision$
  */
public class Environment extends AbstractComponent<Object> {
    /**
     * DOCUMENT ME!
     */
    private static int COUNT = 0;

    /**
     * DOCUMENT ME!
     */
    private EventTracker<String> tracker;

    /**
     * DOCUMENT ME!
     */
    private double random;

    /**
     * DOCUMENT ME!
     */
    private int integer;

    /**
     * Creates a new Environment object.
     */
    public Environment() {
        this("environment");
    }

    /**
     * Creates a new Environment object.
     *
     * @param aName DOCUMENT ME!
     */
    public Environment(String aName) {
        this(aName, "");
    }

    /**
     * Creates a new Environment object.
     *
     * @param aName DOCUMENT ME!
     * @param aPrefix DOCUMENT ME!
     */
    public Environment(String aName, String aPrefix) {
        super(aName, provided(aPrefix), new RequiredInterface[0]);
        random      = Math.random();
        integer     = COUNT++;
    }

    /**
     * Creates a new Environment object.
     *
     * @param aTracker DOCUMENT ME!
     */
    public Environment(EventTracker aTracker) {
        this();
        tracker = aTracker;
    }

    /**
     * DOCUMENT ME!
     *
     * @param aPrefix DOCUMENT ME!
     *
     * @return DOCUMENT ME!
     */
    private static final ProvidedInterface[] provided(String aPrefix) {
        return new ProvidedInterface[] {
            new DefaultProvidedInterface(aPrefix + "datasource", String.class),
            new DefaultProvidedInterface(aPrefix + "integer", Integer.class)
        };
    }

    /**
     * DOCUMENT ME!
     *
     * @return DOCUMENT ME!
     */
    public Integer getInteger() {
        return integer;
    }

    /**
     * DOCUMENT ME!
     *
     * @return DOCUMENT ME!
     */
    public String getString() {
        return getName() + ".hello";
    }

    /**
     * DOCUMENT ME!
     *
     * @param aScope DOCUMENT ME!
     *
     * @return DOCUMENT ME!
     */
    @Override
    protected Object doStart(Scope aScope) {
        addInterface(getProvidedInterfaces().get(0), getString(), aScope);
        addInterface(getProvidedInterfaces().get(1), getInteger(), aScope);
        track("start." + getName());

        return random;
    }

    /**
     * DOCUMENT ME!
     *
     * @param aRuntime DOCUMENT ME!
     */
    @Override
    protected void doStop(Object aRuntime) {
        track("stop." + getName());

        if (random != (Double) aRuntime) {
            throw new IllegalArgumentException("Wrong runtime: expected "
                + random + " but got " + aRuntime);
        }
    }

    /**
     * DOCUMENT ME!
     *
     * @param aString DOCUMENT ME!
     */
    private void track(String aString) {
        if (tracker == null) {
            return;
        }

        tracker.eventOccurred(aString);
    }
}