package simulator;

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;

/*
 * FileLogger.java
 * Created on Jan 6, 2005
 *
 */

/**
 *  FileLogger - This is a particular implementatioon of the Logger interface
 *  In particular, it logs all the events to a pre-specified file.
 *  
 *  @see Logger
 *  @author Ping
 *
 */
public class FileLogger implements Logger
{
    protected final static String FILE_NAME = "park_log.txt";
    
    //private AmusementPark park;
    protected BufferedWriter writer;
    protected Time clock;
  
    
    public FileLogger()
    {
    }
    
    /**
     * This function is called when the park first opens, and initializes
     * the file writers.
     * 
     * @param openingTime - The time when the park opens
     */
    public void parkOpened(Time openingTime)
    {
        // Remember we are just holding on to a reference of it.  
        // We should not modify it
        clock = openingTime;
        
        // creates a new file writer that appends to the log file
        try
        {
            writer = new BufferedWriter(new FileWriter(FILE_NAME, true));
            
            writer.write("--------------------------------------------------------");
            writer.newLine();
            writer.write("Park opened at " + clock.toString());
            writer.newLine();
            writer.write("--------------------------------------------------------");
            writer.newLine();
            writer.flush();
        }
        catch(IOException e)
        {
            System.out.println("Unable to open file writer.");
            e.printStackTrace();
        }
        
    }

    /**
     * This function should be called when the park closes and it will close
     * the file writer.
     */
    public void parkClosed()
    {
        try
        {
            writer.write("--------------------------------------------------------");
            writer.newLine();
            writer.write("Park closed at " + clock.toString());
            writer.newLine();
            writer.write("--------------------------------------------------------");
            writer.newLine();
            writer.flush();
            // close the writer
            writer.close();
        }
        catch(IOException e)
        {
            e.printStackTrace();
        }
        
        
    }
    
    /**
     * This function logs the event of a customer arriving at a particular attraction
     * @param customer - The arriving customer
     * @param attraction - The attraction that the customer arrived at
     */
    public void arriveAtAttraction(Customer customer, Attraction attraction)
    {
        String output = "Rider " + customer.getName() + " arrived at " +
            attraction.getName() + " at " + clock.toString();
        try
        {
            writer.write(output);
            writer.newLine();
            writer.flush();
        }
        catch(IOException e)
        {
            // error writing
            System.out.println("Unable to write \"" + output + "\" to log file.");
            e.printStackTrace();
        }
    }
    
    /**
     * This function logs the event of a customer actually getting on a 
     * particular attraction
     * @param customer - The customer
     * @param attraction - The attraction that the customer boarded
     */
    public void boardAttraction(Customer customer, Attraction attraction)
    {
        String output = "Rider " + customer.getName() + " boarded attraction " +
            attraction.getName() + " at " + clock.toString();
        try
        {
            writer.write(output);
            writer.newLine();
            writer.flush();
        }
        catch(IOException e)
        {
            // error writing
            System.out.println("Unable to write \"" + output + "\" to log file.");
            e.printStackTrace();
        }
    }
    
    /**
     * This function logs the event of a customer exiting an attraction 
     * 
     * @param customer - The exiting customer
     * @param attraction - The attraction that the customer exited from
     */
    public void exitAttraction(Customer customer, Attraction attraction)
    {
        String output = "Rider " + customer.getName() + " exited attraction " +
            attraction.getName() + " at " + clock.toString();
        try
        {
            writer.write(output);
            writer.newLine();
            writer.flush();
        }
        catch(IOException e)
        {
            // error writing
            System.out.println("Unable to write \"" + output + "\" to log file.");
            e.printStackTrace();
        }
    }
    
    /**
     * This function logs the customer's decision on where to go next.
     * 
     * @param customer - The customer who has just decided where to go
     * @param nextStop - The next attraction that the customer decides to go to.  Note
     *  this should be null if the customer is heading to the exit.
     */
    public void nextAttraction(Customer customer, Attraction nextStop)
    {
        StringBuffer output = new StringBuffer("Rider " + customer.getName() + 
                " is heading towards ");
        // if the attraction is null, the customer is going home
        if(nextStop == null)
        {
            output.append("the exit");
        }
        else
        {
            output.append(nextStop.getName());
        }
        output.append(" at " + clock.toString());
        
        try
        {
            writer.write(output.toString());
            writer.newLine();
            writer.flush();
        }
        catch(IOException e)
        {
            // error writing
            System.out.println("Unable to write \"" + output.toString() 
                    + "\" to log file.");
            e.printStackTrace();
        }
    }
}