//                              -*- Mode: Java -*- 
// Cashiers.java --- a collection cashiers
// Author          : Marcel Turcotte
// Created On      : Sat Mar  3 08:00:40 2007
// Last Modified By: Marcel Turcotte
// Last Modified On: Sat Mar  3 08:21:13 2007
// ITI 1121/1521. Introduction to Computer Science II

public class Cashiers {

    // Constant(s)

    private static final String nl = System.getProperty( "line.separator" );
        
    // Instance variable(s)

    private Cashier[] cashiers;

    // Constructor

    public Cashiers( int nb ) {

        if ( nb < 1 ) {
            throw new IllegalArgumentException( Integer.toString( nb ) );
	}

        cashiers = new Cashier[ nb ];

        for ( int i=0; i<nb; i++ ) {
            cashiers[i] = new Cashier();
	}
    }

    public void addCustomer( Customer c ) {
        int vMin, iMin;

        iMin = 0;
        for ( int i=1; i < cashiers.length; i++ ) {
            if ( cashiers[ i ].getQueueSize() < cashiers[ iMin ].getQueueSize() ) {
                iMin = i;
	    }
	}

        cashiers[ iMin ].addCustomer( c );
    }

    public void serveCustomers( int currentTime ) {
        for ( int i=0; i < cashiers.length; i++ ) {
            cashiers[i].serveCustomers( currentTime );
	}
    }

    public String toString() {

	StringBuffer out = new StringBuffer();

        for ( int i=0; i<cashiers.length; i++ ) {
	    out.append( "LINE " + i + " ::" + nl );
	    out.append( cashiers[ i ] );
	    out.append( nl );
        }

        return out.toString();
    }
}