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

public class InteractiveDBTester {
    public static void main(String[] args) {
    	// initialize database
    	CustomerDatabase db = new CustomerDatabase();
    	// confirm only one command-line argument
    	if (args.length != 1) {
			System.out.println("Please provide input file as command-line argument.");
			System.exit(1);
		}
    	// checks whether file exists and is readable
    	File f1 = args[0];
    	if (!f1.exists()) {
			System.out.println("Error: Cannot access input file.");
			System.exit(1);
		}
    	if (!f1.canRead()) {
			System.out.println("Error: Cannot access input file.");
			System.exit(1);
		}
    	
    	// load data and construct customer database
    	
    	
        Scanner stdin = new Scanner(System.in);  // for reading console input
        printOptions();
        boolean done = false;
        while (!done) {
            System.out.print("Enter option ( dfhisqr ): ");
            String input = stdin.nextLine();
            input = input.toLowerCase();  // convert input to lower case

            // only do something if the user enters at least one character
            if (input.length() > 0) {
                char choice = input.charAt(0);  // strip off option character
                String remainder = "";  // used to hold the remainder of input
                if (input.length() > 1) {
                    // trim off any leading or trailing spaces
                    remainder = input.substring(1).trim(); 
                }

                switch (choice) {
                
                case 'd':
                    // discontinue product case
                	if (!db.containsProduct(remainder)) {
                		System.out.println("product not found");
                	}
                	else {
                		db.removeProduct(remainder);
                		System.out.println("product discontinued");
                	}
                    break;


                case 'f':
                    // find customer and return wish list
                	if (!db.containsCustomer(remainder)) {
                		System.out.println("customer not found");
                	}
                	else {
                		List<String> wishlist = db.getProducts(remainder);
                		System.out.println(remainder);
                		System.out.print(":");
                		Iterator<String> iter = wishlist.iterator();
                		while(!iter.hasNext()) {
                			System.out.print(iter.next());
                			System.out.print(",");
                		}
                	}
                    break;

                case 'h': 
                    printOptions();
                    break;

                case 'i':
                    // *** Add code to implement this option ***
                    break;
                    
                case 's':
                    // *** Add code to implement this option ***
                    break;

                case 'q':
                    done = true;
                    System.out.println("quit");
                    break;

                case 'r':
                    // remove customer
                	if (!db.containsCustomer(remainder)) {
                		System.out.println("customer not found");
                	}
                	else {
                		db.removeCustomer(remainder);
                		System.out.println("customer removed");
                	}
                    break;

                default:  // ignore any unknown commands
                    break;
                }
            }
        }
        
        stdin.close();
    }

    /**
     * Prints the list of command options along with a short description of
     * one.  This method should not be modified.
     */
    private static void printOptions() {
        System.out.println("d <product> - discontinue the given <product>");
        System.out.println("f <customer> - find the given <customer>");
        System.out.println("h - display this help menu");
        System.out.println("i - display information about this customer database");
        System.out.println("s <product> - search for the given <product>");
        System.out.println("q - quit");
        System.out.println("r <customer> - remove the given <customer>");
    }
}