package tmcsim.cadsimulator.managers;

import java.io.File;
import java.io.FileInputStream;
import java.util.Observable;
import java.util.Observer;
import java.util.Properties;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.swing.JOptionPane;
import javax.swing.JWindow;
import javax.xml.parsers.DocumentBuilderFactory;

import tmcsim.cadsimulator.db.DVDPlayerDB;
import tmcsim.cadsimulator.db.StillImagesDB;
import tmcsim.cadsimulator.stillimagecontrol.ImageController;
import tmcsim.cadsimulator.videocontrol.DVDController;
import tmcsim.cadsimulator.videocontrol.DVDStatusUpdate;
import tmcsim.cadsimulator.videocontrol.DVDTitleUpdate;
import tmcsim.cadsimulator.viewer.CADSimulatorViewer;
import tmcsim.common.CCTVDirections;
import tmcsim.common.CCTVInfo;

/**
 * MediaManager manages the control of media associated with the speed 
 * information received from the ParamicsCommunicator.  The MediaManager
 * instantiates the DVDPlayerDB and StillImageDB objects, which are initialized
 * from XML data files to hold the information regarding which DVD titles and 
 * Still Images are available for display.  Each title or image is associated
 * with a specific speed range or Incident log number.  The triggerIncident()
 * method is called to notify the MediaManager that incident media is to be 
 * displayed.  The updateCameraInfo() method is called when speed information
 * is received for a specific camera.  In both methods, a Controller object
 * is found for the unique camera ID number.  This Controller is updated with
 * the new speed data.  If the update causes a change in media to be displayed,
 * the change is made.<br>
 * <br>
 * The MediaManager implements the Observer interface and observes the 
 * DVDPlayerDB and StillImageDB for updates.  These updates are received, action
 * is taken, and then the update is passed to the CADSimulatorViewer for display.
 * 
 * @see tmcsim.cadsimulator.viewer.CADSimulatorViewer
 * @author Matthew Cechini
 * @version
 */
public class MediaManager implements Observer {

    /**  Error Logger. */
    private static Logger mediaLogger = Logger.getLogger("tmcsim.simulator");
    
    /**
     * Enumeration of property names.
     * @author Matthew Cechini
     */ 
    private static enum MEDIA_PROPERTIES {
        /** Filepath for xml file containing dvd control data. */
        DVD_XML_FILE   ("DVDPlayerXML"),    
        /** Filepath for xml file containing still image control data. */
        IMAGE_XML_FILE ("StillImagesXML");
        
        public String name;
        
        private MEDIA_PROPERTIES(String n) {
            name = n;
        }
    };  
    
    /** Instance of the DVD Player Database. */
    private DVDPlayerDB theDVD_DB     = null;

    /** Instance of the Still Image Database. */
    private StillImagesDB theImage_DB = null;
    
    /** Reference to the CADSimulatorViewer. */
    private CADSimulatorViewer theViewer;

    /** Properties object for the Media portion of the CAD. */
    private Properties mediaProperties;
    
    
    /**
     * Constructor. The target properties file is loaded and the DVD and Still
     * Image DB objects are initialized with the XML data files containing 
     * the respective data.
     * 
     * @param propertiesFile File path for target properties file. 
     * @param theATMSManager ATMSManager object.
     * @param viewer CADSimulatorViewer object.
     */
    public MediaManager(String propertiesFile, ATMSManager theATMSManager, 
            CADSimulatorViewer viewer) {
        theDVD_DB   = new DVDPlayerDB();        
        theImage_DB = new StillImagesDB();
        
        theViewer = viewer;

        try {
            mediaProperties = new Properties();
            mediaProperties.load(new FileInputStream(new File(propertiesFile)));
        }
        catch (Exception e) {
            mediaLogger.logp(Level.SEVERE, "MediaManager", "Constructor",
                    "Exception in loading properties file.", e);
        }
        
        // Load DVD Player Information from the XML file
        try {
            if (mediaProperties.getProperty(MEDIA_PROPERTIES.DVD_XML_FILE.name) != null) {
                theDVD_DB.addObserver(this);
                theDVD_DB.loadFromXML(DocumentBuilderFactory
                                .newInstance().newDocumentBuilder()
                                .parse(new File(mediaProperties.getProperty(
                                        MEDIA_PROPERTIES.DVD_XML_FILE.name))));

            }
        } catch (Exception e) {
            mediaLogger.logp(Level.SEVERE, "MediaManager", "Constructor",
                    "Exception in parsing DVDPlayer xml file.", e);
            
             JOptionPane.showMessageDialog(new JWindow(), "An error occured " +
                    "opening and parsing the DVD xml data file: " +
                    mediaProperties.getProperty(MEDIA_PROPERTIES.DVD_XML_FILE.name),
                    "Initialization Error", JOptionPane.WARNING_MESSAGE);
        }

        // Load Still Image Information from the XML file
        try {
            if (mediaProperties
                    .getProperty(MEDIA_PROPERTIES.IMAGE_XML_FILE.name) != null) {
                theImage_DB.addObserver(this);
                theImage_DB.loadFromXML(DocumentBuilderFactory
                                .newInstance().newDocumentBuilder()
                                .parse(new File(mediaProperties.getProperty(
                                        MEDIA_PROPERTIES.IMAGE_XML_FILE.name))),
                                        theATMSManager);
            }
        } catch (Exception e) {
            mediaLogger.logp(Level.SEVERE, "MediaManager", "Constructor",
                    "Exception in parsing StillImages xml file.", e);
            
             JOptionPane.showMessageDialog(new JWindow(), "An error occured " +
                    "opening and parsing the Image xml data file: " +
                    mediaProperties.getProperty(MEDIA_PROPERTIES.IMAGE_XML_FILE.name),
                    "Initialization Error", JOptionPane.WARNING_MESSAGE);
        }           
    }
    
    /**
     * Observer method.  The update objects accepted and their associated 
     * actions are shown below.<br>
     * <br>
     * <ul>
     * <li>DVDStatusUpdate - If the update contains an exception, log the 
     *     exception to the local logger.  The update object is then sent
     *     to the CADSimulatorViewer for display.</li>
     * <li>DVDTitleUpdate - The update object is sent
     *     to the CADSimulatorViewer for display.</li>
     * </ul>
     */
    public void update(Observable o, Object arg) {
        if(arg instanceof DVDStatusUpdate) {
            if(((DVDStatusUpdate)arg).exception != null) {
                mediaLogger.logp(Level.SEVERE, "MediaManager", "update",
                        "Exception from DVD Controller.", 
                        ((DVDStatusUpdate)arg).exception);
            }
            theViewer.updateDVDStatus((DVDStatusUpdate)arg);
        }
        else if(arg instanceof DVDTitleUpdate) {
            theViewer.updateDVDTitle((DVDTitleUpdate)arg);
        }
    }

    /**
     * This method triggers the DVD and Image Controllers for a specific camera
     * to display an Incident title or image for the parameter Incident log
     * number.
     * 
     * @param info Information of the CCTV Camera to display incident images.
     * @param logNumber Log number of the Incident being triggered.
     */
    public void triggerIncident(CCTVInfo info, Integer logNumber) {
        try {
            DVDController dvdCntrl = theDVD_DB.getController(info.cctv_id, 
                    info.direction);
            
            if(dvdCntrl != null) {  
                dvdCntrl.toggleIncident(logNumber, info.toggle);
            }
        } catch (Exception e) {
            mediaLogger.logp(Level.SEVERE, "MediaManager", "triggerIncident",
                    "Exception in toggling an incident on the DVD controller.", e);
        }
        
        try {
            ImageController imageCntrl = theImage_DB.getController(info.cctv_id, info.direction);
            
            if(imageCntrl != null) { 
                imageCntrl.toggleIncident(logNumber, info.toggle);
            }
        } catch (Exception e) {
            mediaLogger.logp(Level.SEVERE, "MediaManager", "triggerIncident",
                    "Exception in toggling an incident on the Image controller.", e);
        }
        
    }
    
    /**
     * This method receives updated speed information for a specific controller
     * and updates the DVD Title and Still Image being currently displayed for 
     * that camera.
     * 
     * @param cameraID CCTV camera ID
     * @param avgSpeed_NE Average speed of traffic flowing N or E
     * @param avgSpeed_SW Average speed of traffic flowing S or W
     */
    public void updateCameraInfo(Integer cameraID, float avgSpeed_NE, float avgSpeed_SW) {
        updateDVD(cameraID, avgSpeed_NE, avgSpeed_SW);
        updateStillImage(cameraID, avgSpeed_NE, avgSpeed_SW);
    }
    
    /**
     * This method accepts updated speed information for a specific DVD 
     * player. The DVDController object corresponding to the parameter camera 
     * ID is found and updated with the new speed.  If this update causes the 
     * dvd controller to change titles, the new title is played.
     *
     * @param cameraID CCTV camera ID
     * @param avgSpeed_NE Average speed of traffic flowing N or E
     * @param avgSpeed_SW Average speed of traffic flowing S or W
     */
    protected void updateDVD(Integer cameraID, float avgSpeed_NE, float avgSpeed_SW) {
            
        for(CCTVDirections dir : CCTVDirections.values()) {
            DVDController dvdCntrl = theDVD_DB.getController(cameraID, dir);
            
            //if Controller exists, update.
            if(dvdCntrl != null) {                          
                
                if( ((dir == CCTVDirections.NORTH || dir == CCTVDirections.EAST) && 
                     (dvdCntrl.updatePlayer(avgSpeed_NE)))  ||
                    ((dir == CCTVDirections.SOUTH || dir == CCTVDirections.WEST) && 
                     (dvdCntrl.updatePlayer(avgSpeed_SW)))) {
                    
                    try {
                        dvdCntrl.playCurrentTitle();
                    }
                    catch (Exception e) {
                        mediaLogger.logp(Level.SEVERE, "ParamicsCameraStatusReader", "updateDVD",
                                "Exception in updating DVD player with new speed.", e);
                    }
                }           
            }
        }   
    }

    /** 
     * This method accepts updated speed information for a specific CCTV camera.
     * The ImageController object corresponding to the parameter camera ID
     * is found and updated with the new speed.  If this update causes the image
     * controller to change images, the new image is shown.
     * 
     * @param cameraID Unique CCTV camera ID
     * @param avgSpeed_NE Average speed of traffic flowing N or E
     * @param avgSpeed_SW Average speed of traffic flowing S or W
     */
    protected void updateStillImage(Integer cameraID, float avgSpeed_NE, float avgSpeed_SW) {
        
        for(CCTVDirections dir : CCTVDirections.values()) {
            ImageController imageCntrl = theImage_DB.getController(cameraID, dir);
            
            //if Controller exists, update.
            if(imageCntrl != null) {
            
                if( ((dir == CCTVDirections.NORTH || dir == CCTVDirections.EAST) && 
                     (imageCntrl.updateImage(avgSpeed_NE)))  ||
                    ((dir == CCTVDirections.SOUTH || dir == CCTVDirections.WEST) && 
                     (imageCntrl.updateImage(avgSpeed_SW)))) {
                    
                    try {
                        imageCntrl.showCurrentImage();
                    }
                    catch (Exception e) {
                        mediaLogger.logp(Level.SEVERE, "ParamicsCameraStatusReader", "updateStillImage",
                                "Exception in updating image controller with new speed.", e);
                    }
                }
            }           
        }       
    }
    
}
