// CSE 331, Homework 4 (Election)
// Instructor-provided code.
// You SHOULD modify this file to make it interface with your own classes.

/**
 * This class represents the text user interface (UI) for the restaurant
 * program, allowing the user to view and manage the restaurant and its objects.
 * 
 * @author Marty Stepp
 * @version Spring 2011 v1.0
 */
public final class ElectionTextUI {
	
	/**
	 * Constructs a new text user interface for managing a restaurant.
	 */
	public ElectionTextUI() {
		System.out.println("CSE 331 Election Vote Counter");

		// TODO: initialization code can go here
		crash("TODO: implement initialization code");
	}
	
	/**
	 * Displays the main menu of choices and prompts the user to enter a choice.
	 * Once a valid choice is made, initiates other code to handle that choice.
	 */
	public void mainMenu() {
		// main menu
		displayOptions();
		while (true) {
			String choice = ValidInputReader.getValidString(
					"Main menu, enter your choice:",
					"^[aAcCrRpPeEqQ?]$").toUpperCase();
			if (choice.equals("A")) {
				addPollingPlace();
			} else if (choice.equals("C")) {
				closeElection();
			} else if (choice.equals("R")) {
				results();
			} else if (choice.equals("P")) {
				perPollingPlaceResults();
			} else if (choice.equals("E")) {
				eliminate();
			} else if (choice.equals("?")) {
				displayOptions();
			} else if (choice.equals("Q")) {
				System.out.println("Goodbye.");
				break;
			}
			System.out.println();
		}
	}
	
	// Displays the list of key commands the user can use.
	private void displayOptions() {
		System.out.println();
		System.out.println("Main System Menu");
		System.out.println("----------------");
		System.out.println("A)dd polling place");
		System.out.println("C)lose the polls");
		System.out.println("R)esults");
		System.out.println("P)er-polling-place results");
		System.out.println("E)liminate lowest candidate");
		System.out.println("?) display this menu of choices again");
		System.out.println("Q)uit");
		System.out.println();
	}
	
	// Called when P key is pressed from main menu.
	// Reads data from a new polling place.
	private void addPollingPlace() {
		// when the election is not open,
		System.out.println("The election is closed.");
		System.out.println("No more polling places may be added.");
		
		String pollingPlaceName = ValidInputReader.getValidString("Name of polling place:", "^[a-zA-Z0-9 ]+$");
		
		System.out.println("Added " + pollingPlaceName + ".");
		// TODO: add polling place's data to election totals

		// when the polling place is not found,
		System.out.println("No such polling place was found.");

		crash("TODO: implement adding a polling place");
	}
	
	// Called when C key is pressed from main menu.
	// Closes the election so that no more voting can take place.
	private void closeElection() {
		System.out.println("Closing the election.");

		// TODO: close the election
		crash("TODO: implement closing an election");
	}
	
	// Called when R key is pressed from main menu.
	// Shows the current results of the election.
	private void results() {
		// when the election is not closed,
		System.out.println("The election is still open for votes.");
		System.out.println("You must close the election before viewing results.");
		
		// when the election is closed,
		System.out.println("Current election results for all polling places.");

		// TODO: show the current results
		System.out.println("NAME                          PARTY   VOTES     %");
		
//		System.out.printf("%-30s%-8s%5d%9.1f\n", 
//					candidate's name,
//					candidate's political party (3-letter name),
//					candidate's votes,
//					candidate's vote percentage);

	
		crash("TODO: implement results");
	}
	
	// Called when R key is pressed from main menu.
	// Shows the current results of the election.
	private void perPollingPlaceResults() {
		// when the election is not closed,
		System.out.println("The election is still open for votes.");
		System.out.println("You must close the election before viewing results.");
		
		String pollingPlaceName = ValidInputReader.getValidString("Name of polling place:", "^[a-zA-Z0-9 ]+$");
		
		// when the polling place exists,
		System.out.println("Current election results for " + pollingPlaceName + ".");
		// TODO: show the current results for this polling place

		// when the polling place doesn't exist, 
		System.out.println("No such polling place was found.");
		crash("TODO: implement per-polling place results");
	}

	// Called when E key is pressed from main menu.
	// Removes the candidate who has the fewest votes, and reallocates his/her
	// votes to the next available choice for those ballots.
	private void eliminate() {
		// when the election is not closed,
		System.out.println("The election is still open for votes.");
		System.out.println("You must close the election before eliminating candidates.");
		
		// when the election already has a winner,
		System.out.println("A candidate already has a majority of the votes.");
		System.out.println("You cannot remove any more candidates.");
		
		// when we can eliminate a candidate,
		System.out.println("Eliminating the lowest-ranked candidate.");

		// TODO: eliminate the candidate
		System.out.println("Eliminated (candidate).");
		crash("TODO: implement eliminate");
	}
	
	// This helper is just put into the text UI code to mark places where you
	// will need to add or modify this file.  Crashes with a runtime exception.
	private void crash(String message) {
		// Math.random() < 10 will always be true;  so why is it there?
		// I can't just throw because Eclipse will then warn about dead code
		// for any code that occurs after a call to crash().
		// So I wrap the exception throw in an "opaque predicate" to fool it.
		if (Math.random() < 10) {
			throw new RuntimeException("Not yet implemented: " + message);
		}
	}
}