/**
 * Copyright (c) 2010-2019 by the respective copyright holders.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 */
package org.openhab.binding.mios.internal.config;

import java.io.InputStream;
import java.util.HashMap;
import java.util.Map.Entry;
import java.util.Properties;

import org.openhab.core.items.Item;
import org.openhab.core.transform.TransformationException;
import org.openhab.core.types.Command;
import org.openhab.model.item.binding.BindingConfigParseException;

/**
 * A BindingConfig object targeted at MiOS Scene Attributes.
 *
 * The scene-specific form of a MiOS Binding is:<br>
 * <ul>
 * <li><nobr> <tt>mios="unit:<i>unitName</i>,scene:<i>sceneId</i>/<i>attrName</i>,<i>optionalTransformations</i></tt>
 * </nobr>
 * </ul>
 * <p>
 *
 * Example Item declarations:
 * <p>
 * <p>
 * <ul>
 * <li>
 * <code><nobr>String   SceneAlarmArrivingDisarmed "Alarm Arriving Disarmed Scene" <sofa> (GScene) {mios="unit:house,scene:2/status,command:,in:MAP(miosStatusIn.map)", autoupdate="false"}</nobr></code>
 * <li>
 * <code><nobr>Contact  SceneAlarmArrivingDisarmedActive "Active [%s]" <sofa> {mios="unit:house,scene:2/active,in:MAP(miosSceneActiveIn.map)"}</nobr></code>
 * </ul>
 * <p>
 *
 * <b>Optional Transformations</b>
 * <p>
 * See the Optional Transformations section of the JavaDoc for {@link DeviceBindingConfig} for a description of the main
 * options here.
 *
 * The one addition is that Scene Bindings also support:
 * <ul>
 * <li><code>command:</code> - map <i>any</i> openHAB Command sent to the Item, and use it to trigger Scene execution.
 * <li><code>command:ON</code> - map <i>only</i> the <code>ON</code> Command sent to the Item, and use it to trigger
 * Scene execution ("<code>ON</code>" can be any openHAB Command string)
 * </ul>
 *
 * @author Mark Clark
 * @since 1.6.0
 */
public class SceneBindingConfig extends MiosBindingConfig {

    private static HashMap<String, ParameterDefaults> paramDefaults = new HashMap<String, ParameterDefaults>();
    private static String PARAM_DEFAULTS = "org/openhab/binding/mios/internal/config/SceneDefaults.properties";

    static {
        ClassLoader cl = SceneBindingConfig.class.getClassLoader();
        InputStream input;

        input = cl.getResourceAsStream(PARAM_DEFAULTS);

        try {
            Properties tmp = new Properties();
            tmp.load(input);

            for (Entry<Object, Object> e : tmp.entrySet()) {
                paramDefaults.put((String) e.getKey(), ParameterDefaults.parse((String) e.getValue()));
            }

            logger.debug("Successfully loaded Scene Parameter defaults from '{}', entries '{}'", PARAM_DEFAULTS,
                    paramDefaults.size());
        } catch (Exception e) {
            // Pre-shipped with the Binding, so it should never error out.
            logger.error("Failed to load Scene Parameter defaults file '{}', Exception", PARAM_DEFAULTS, e);
        }
    }

    private SceneBindingConfig(String context, String itemName, String unitName, int id, String stuff,
            Class<? extends Item> itemType, String commandTransform, String inTransform, String outTransform)
                    throws BindingConfigParseException {
        super(context, itemName, unitName, id, stuff, itemType, commandTransform, inTransform, outTransform);
    }

    /**
     * Static constructor-method.
     * 
     * @return an initialized MiOS Scene Binding Configuration object.
     */
    public static final MiosBindingConfig create(String context, String itemName, String unitName, int id, String stuff,
            Class<? extends Item> itemType, String commandTransform, String inTransform, String outTransform)
                    throws BindingConfigParseException {
        ParameterDefaults pd = paramDefaults.get(stuff);
        if (pd != null) {
            logger.trace("Scene ParameterDefaults FOUND '{}' for '{}', '{}'", itemName, stuff, pd);
            if (commandTransform == null) {
                commandTransform = pd.getCommandTransform();
                logger.trace("Scene ParameterDefaults '{}' defaulted command: to '{}'", itemName, commandTransform);
            }
            if (inTransform == null) {
                inTransform = pd.getInTransform();
                logger.trace("Scene ParameterDefaults '{}' defaulted in: to '{}'", itemName, inTransform);
            }
            if (outTransform == null) {
                outTransform = pd.getOutTransform();
                logger.trace("Scene ParameterDefaults '{}' defaulted out: to '{}'", itemName, outTransform);
            }
        } else {
            logger.trace("Scene ParameterDefaults NOT FOUND '{}' for '{}'", itemName, stuff);
        }

        MiosBindingConfig c = new SceneBindingConfig(context, itemName, unitName, id, stuff, itemType, commandTransform,
                inTransform, outTransform);

        c.initialize();
        return c;
    }

    /**
     * Returns the value "<code>scene</code>".
     * 
     * @return the value "<code>scene</code>"
     */
    @Override
    public String getMiosType() {
        return "scene";
    }

    @Override
    public String transformCommand(Command command) throws TransformationException {
        String key = command.toString();

        String cThing = getCommandTransform();
        if (cThing == null) {
            return null;
        } else if ("".equals(cThing)) {
            return key;
        } else {
            String[] commands = cThing.split("\\|");

            for (int i = 0; i < cThing.length(); i++) {
                if (key.equals(commands[i])) {
                    return key;
                }
            }
        }

        return null;
    }
}
