import java.util.Scanner;
import java.io.*;

public class ConfigProcessor {

	private String filename;
	
	public ConfigProcessor(String filename) {
		this.filename = filename;
	}
	
	public ConfigInfo processFile() throws InvalidGameException, InvalidNumDecksException, InvalidJokerSelectionException, InvalidWildCardException, MalformedConfigException {
		
		ConfigInfo ci = null;
		
		//open file
		Scanner s;
		try {
			s = new Scanner(new File(filename));
		} catch(FileNotFoundException fnfe) {
			throw new MalformedConfigException(filename + " cannot be found.  " + fnfe.getMessage());
		}
		
		String line;
		//String type;
		String game;
		String tmpvalue;
		int numdecks;
		char usejokers;
		String[] wildcards;
		
		line = s.nextLine();
		//System.out.println("LINE " + line);
		//verify that data type is game
		if(line.startsWith("game=")) {
			game = line.substring(5);
			//System.out.println("GAME " + game);
			//verify that game is a valid game
			if(!game.equals("blackjack") && !game.equals("poker")) {
				throw new InvalidGameException("You can't play game " + game + " here!");
			}
		} else {
			throw new MalformedConfigException("Config file busted.  Expected \"game=\"");
		}
		
		line = s.nextLine();
		if(line.startsWith("num_decks=")) {
			tmpvalue = line.substring(10);
			try {
				numdecks = Integer.parseInt(tmpvalue);
			} catch(NumberFormatException nfe) {
				throw new InvalidNumDecksException(tmpvalue + " is a String, int expected.");
			}
			if(numdecks < 1 || numdecks > 6) {
				throw new InvalidNumDecksException("Number of decks must be 1-6.  Found value " + numdecks);
			}
			
		} else {
			throw new MalformedConfigException("Config file busted.  Expected \"num_decks=\"");			
		}
		
		line = s.nextLine();
		if(line.startsWith("use_jokers=")) {
			tmpvalue = line.substring(11);
			if(tmpvalue.length() > 1 || tmpvalue.length() == 0) {
				throw new InvalidJokerSelectionException("Expected y/n and found " + tmpvalue);
			}
			usejokers = tmpvalue.charAt(0);
			if(usejokers != 'y' && usejokers != 'n') {
				throw new InvalidJokerSelectionException("Expected y/n and found " + tmpvalue);
			}
		} else {
			throw new MalformedConfigException("Config file busted.  Expected \"use_jokers=\"");						
		}
		
		//ci = new ConfigInfo(game, numdecks, usejokers...);
		return ci;
	}
	
}