/*
 * Name: Mike Cifelli
 * Course: CIS 443 - Programming Languages
 * Assignment: Lisp Interpreter Phase 1 - Lexical Analysis
 */

package error;

import java.text.MessageFormat;

/**
 * <code>ErrorManager</code> is an error handling class for a Lisp interpreter.
 */
public class ErrorManager {

    /**
     * The lowest "criticality" level of an error that will cause the currently
     * running program to terminate.
     */
    public static final int CRITICAL_LEVEL = 3;

    public static final String ANSI_RESET = "\u001B[0m";
    public static final String ANSI_RED = "\u001B[31m";
    public static final String ANSI_YELLOW = "\u001B[33m";
    public static final String ANSI_PURPLE = "\u001B[35m";

    /**
     * Prints out the specified error message to the console and decides
     * whether or not to terminate the currently running program.
     *
     * @param message
     *  the error message
     * @param level
     *  the "criticality" level of the error
     * @postcondition
     *  If <code>level &gt;= CRITICAL_LEVEL</code> the currently running
     *  program has been terminated.
     */
    public static void generateError(String message, int level) {
        String color = (level >= CRITICAL_LEVEL) ? ANSI_PURPLE : ANSI_RED;
        String formattedMessage = MessageFormat.format("{0}error: {1}{2}", color, message, ANSI_RESET);

        System.out.println(formattedMessage);

        if (level >= CRITICAL_LEVEL) {
            System.exit(1);
        }
    }

}