package se1021.fileio.hw;
import java.io.*;
import java.util.*;
import javax.swing.*;

/*
 * This application demonstrates file I/O using text, binary, and object approaches
 */
public class RosterIOApp {

	List<Student> roster; // a collection of Students

	// main entry method
	public static void main(String[] args) {
		new RosterIOApp();
	}

	// constructor - inits the app
	public RosterIOApp() {

		roster = new ArrayList<Student>(); // create the actual collection

		// add some students to initialize the collection
		roster.add( new Student("Ann", 123, 3.50) );
		roster.add( new Student("Bob", 456, 2.80) );
		roster.add( new Student("Carl", 789, 3.00) );

		String filename = "roster.txt"; // without path spec, JVM assumes the file is in the project directory

		// ask the user what to do...
		String options[] = {"Open/Read a File", "Save/Write a File"};
		String choice = (String)JOptionPane.showInputDialog(null, "Choices", "Select an operation", 
				JOptionPane.QUESTION_MESSAGE, null, options, "Open Text File");

		//TODO: Use JFileChooser to select a file

		// try reading or writing a file, based on the user's choice
		try {
			if( choice.equals("Open/Read a File") ) { // read a file
				roster.clear(); // erase the initial roster
				openTextRoster( filename ); // read a text file
				System.out.println("The roster list is as follows:");
				for( Student s: roster ) {
					System.out.println(s.getName() + "," + s.getId() + "," + s.getGpa() );
				}

			} else if( choice.equals("Save/Write a File") ) { // write a file
				saveTextRoster( filename ); // write a text file
				System.out.println("Save complete!");
			}

		} catch( IOException e ) { // catch only IOExceptions during read or write
			System.out.println( "IO Error: " + e );
		} catch( Exception e ) { // catch any and all other exceptions during read or write
			System.out.println( "General Error: " + e );
		}
	}


	// read a text file and create a roster from it
	private void openTextRoster( String filename ) throws Exception {
	}

	// save the roster to a text file
	private void saveTextRoster(String filename) throws Exception {
	}

	// read a binary file and create a roster from it
	private void openBinaryRoster( String filename ) throws Exception {
	}
	
	// save the roster to a binary file
	private void saveBinaryRoster( String filename ) throws Exception {
	}
	
	// read an object file and create a roster from it
	private void openObjectRoster( String filename ) throws Exception {
	}
	
	// save the roster (serialize it) to a file
	private void saveObjectRoster( String filename ) throws Exception {
	}
}