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

public class RMIClient {

	public static void main(String[] args) {

		if (args.length < 5) {
			System.err.println("Usage: at least 5 args\n"
					+ "Please read \"README.doc\" first.");
			return;
		}

		String servername = args[0];
		int port = Integer.parseInt(args[1]);
		String operation = args[2];
		String username = args[3];
		String password = args[4];

		try {
			String registration = "rmi://" + servername + ":" + port
					+ "/RMIInterface";
			Remote remoteService = Naming.lookup(registration);
			RMIInterface Service = (RMIInterface) remoteService;

			BufferedReader input = new BufferedReader(new InputStreamReader(
					System.in));

			// operate the args
			String[] cmd = args;
			String otherusername = "";
			String title = "";
			int meetingid = 0;
			Date start = null;
			Date end = null;

			if (!operation.equals("register")
					&& !Service.login(username, password)) {
				System.out.println("Error!");
				return;
			}

			while (!operation.equals("quit")) {

				if (operation.equals("help")) {
					System.out
							.println("1.If you input any operation else, "
									+ "the program will do nothing and "
									+ "return to the main menu.\n"
									+ "2.The \"start\" and \"end\" time "
									+ "should be in this format: "
									+ "YYYY_MM_DD_H_M_S");
				}

				if (operation.equals("register")) {
					if (Service.register(username, password))
						System.out.println("Successful!");
					else {
						System.out.println("Failed!");
						return;
					}
				}

				if (operation.equals("add")) {
					if (cmd.length < 9) {
						System.err.println("Usage: at least 9 args\n"
								+ "Please read \"README.doc\" first.");
						return;
					}

					otherusername = cmd[5];
					start = toDate(cmd[6]);
					end = toDate(cmd[7]);
					title = cmd[8];

					if (start == null || end == null) {
						System.out.println("Failed!");
					} else {
						if (Service.add(username, password, otherusername,
								title, start, end)) {
							System.out.println("Successful!");
						} else {
							System.out.println("Failed!");
						}
					}
				}

				if (operation.equals("delete")) {
					if (cmd.length < 6) {
						System.err.println("Usage: at least 6 args\n"
								+ "Please read \"README.doc\" first.");
						return;
					}

					meetingid = Integer.parseInt(cmd[5]);

					if (Service.delete(username, password, meetingid)) {
						System.out.println("Successful!");
					} else {
						System.out.println("Failed!");
					}
				}

				if (operation.equals("clear")) {
					if (Service.clear(username, password)) {
						System.out.println("Successful!");
					} else {
						System.out.println("Failed!");
					}
				}

				if (operation.equals("query")) {
					if (cmd.length < 7) {
						System.err.println("Usage: at least 7 args");
						return;
					}

					start = toDate(cmd[5]);
					end = toDate(cmd[6]);

					if (start == null || end == null) {
						System.out.println("Failed!");
					} else {
						Vector<Meeting> v = Service.query(username, password,
								start, end);

						if (v == null)
							System.out.println("Failed!");
						else if (v.isEmpty())
							System.out.println("No meetings found.");
						else
							System.out.println(v);
					}
				}

				displayMenu();

				System.out.println("Input an operation: ");
				operation = input.readLine();
				int sumArgs = 0;

				if (operation.equals("add"))
					sumArgs = 4;
				if (operation.equals("delete"))
					sumArgs = 1;
				if (operation.equals("query"))
					sumArgs = 2;

				cmd = new String[5 + sumArgs];

				for (int i = 0; i < sumArgs; i++) {
					System.out.println("Input argument " + (i + 1) + ":");
					cmd[5 + i] = input.readLine();
				}
			}
		} catch (Exception e) {
			System.err.println(e.toString());
		}

	}

	public static void displayMenu() {

		System.out.println("RMI Menu:");
		System.out.println("\t1. add\n"
				+ "\t\targuments: <username> <start> <end> <title>");
		System.out.println("\t2. delete\n" + "\t\targuments: <meetingid>");
		System.out.println("\t3. clear\n" + "\t\targuments: no args");
		System.out.println("\t4. query\n" + "\t\targuments: <start> <end>");
		System.out.println("\t5. help\n" + "\t\targuments: no args");
		System.out.println("\t6. quit\n" + "\t\targuments: no args\n");
	}

	public static Date toDate(String date) {

		StringTokenizer token = new StringTokenizer(date, "_");
		if (token.countTokens() != 6) {
			System.err.println("Error");
			return null;
		}
		int year = Integer.parseInt(token.nextToken());
		int month = Integer.parseInt(token.nextToken());
		int day = Integer.parseInt(token.nextToken());
		int hour = Integer.parseInt(token.nextToken());
		int minute = Integer.parseInt(token.nextToken());
		int second = Integer.parseInt(token.nextToken());
		Date d = new Date(year, month, day, hour, minute, second);
		return d;
	}

}