import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.PrintWriter;
import java.io.IOException;
import java.io.BufferedReader;
import java.util.ArrayList;
import java.util.List;


/*******************************************************************************
 * Třída CarIO pro čtení a záznam seznamu aut do text. souboru.
 *
 * @author    Tomáš Pitner
 * @version   1.00, 10.8.2005
 */
public class CarIO {

    private File carFile;

    /***************************************************************************
     * 
     */
    public CarIO(File cf) {
        carFile = cf;
    }
    
    public List<Car> readCars() throws IOException {
        List<Car> lc = new ArrayList<Car>();
        
        Car c = null;
        
        FileReader fr = new FileReader(carFile);
        BufferedReader br = new BufferedReader(fr);
        
        String line = br.readLine();
        
        while (line != null) {
            
            if(line.startsWith("Truck")) {
                // read/create a Truck
                String label = line.substring("Truck ".length(), "Truck ".length() + 7);
                double maxLoad = readDouble(line.substring("Truck ".length() + 8));
                c = new Truck(label, maxLoad);
                
            } else if(line.startsWith("Private car")) {
                // read/create a Private car
                String label = line.substring("Private car ".length(), "Private car ".length() + 7);
                int seats = readInt(line.substring("Private car ".length() + 8));
                c = new PrivateCar(label, seats);
                
            } else {
                throw new IOException("Cannot read a Car of an unknown type.");   
            }
            
            lc.add(c);
            line = br.readLine();
        }
        br.close();
        return lc;
    }
    
    public void writeCars(List<Car> lc) throws IOException {
        FileWriter fw = new FileWriter(carFile);
        PrintWriter pw = new PrintWriter(fw);
        for(Car c: lc) {
            pw.println(c.asRecord());
            pw.flush();
        }
        pw.close();
    }
    
    protected static int readInt(String s) {
        return Integer.parseInt(s);
    }    
   
    protected static double readDouble(String s) {
        return Double.parseDouble(s);
    }    
   
}