package fr.xephi.authme.util;

import fr.xephi.authme.ConsoleLogger;
import org.bukkit.ChatColor;
import org.bukkit.command.CommandSender;
import org.bukkit.command.ConsoleCommandSender;

import java.util.Collection;
import java.util.regex.Pattern;

/**
 * Utility class for various operations used in the codebase.
 */
public final class Utils {

    /** Number of milliseconds in a minute. */
    public static final long MILLIS_PER_MINUTE = 60_000L;
    /** Number of milliseconds in an hour. */
    public static final long MILLIS_PER_HOUR = 60 * MILLIS_PER_MINUTE;

    // Utility class
    private Utils() {
    }

    /**
     * Compile Pattern sneaky without throwing Exception.
     *
     * @param pattern pattern string to compile
     *
     * @return the given regex compiled into Pattern object.
     */
    public static Pattern safePatternCompile(String pattern) {
        try {
            return Pattern.compile(pattern);
        } catch (Exception e) {
            ConsoleLogger.warning("Failed to compile pattern '" + pattern + "' - defaulting to allowing everything");
            return Pattern.compile(".*?");
        }
    }

    /**
     * Returns whether the class exists in the current class loader.
     *
     * @param className the class name to check
     *
     * @return true if the class is loaded, false otherwise
     */
    public static boolean isClassLoaded(String className) {
        try {
            Class.forName(className);
            return true;
        } catch (ClassNotFoundException e) {
            return false;
        }
    }

    /**
     * Sends a message to the given sender (null safe), and logs the message to the console.
     * This method is aware that the command sender might be the console sender and avoids
     * displaying the message twice in this case.
     *
     * @param sender the sender to inform
     * @param message the message to log and send
     */
    public static void logAndSendMessage(CommandSender sender, String message) {
        ConsoleLogger.info(message);
        // Make sure sender is not console user, which will see the message from ConsoleLogger already
        if (sender != null && !(sender instanceof ConsoleCommandSender)) {
            sender.sendMessage(message);
        }
    }

    /**
     * Sends a warning to the given sender (null safe), and logs the warning to the console.
     * This method is aware that the command sender might be the console sender and avoids
     * displaying the message twice in this case.
     *
     * @param sender the sender to inform
     * @param message the warning to log and send
     */
    public static void logAndSendWarning(CommandSender sender, String message) {
        ConsoleLogger.warning(message);
        // Make sure sender is not console user, which will see the message from ConsoleLogger already
        if (sender != null && !(sender instanceof ConsoleCommandSender)) {
            sender.sendMessage(ChatColor.RED + message);
        }
    }

    /**
     * Null-safe way to check whether a collection is empty or not.
     *
     * @param coll The collection to verify
     * @return True if the collection is null or empty, false otherwise
     */
    public static boolean isCollectionEmpty(Collection<?> coll) {
        return coll == null || coll.isEmpty();
    }

    /**
     * Return the available core count of the JVM.
     *
     * @return the core count
     */
    public static int getCoreCount() {
        return Runtime.getRuntime().availableProcessors();
    }

    /**
     * Returns whether the given email is empty or equal to the standard "undefined" email address.
     *
     * @param email the email to check
     *
     * @return true if the email is empty
     */
    public static boolean isEmailEmpty(String email) {
        return StringUtils.isEmpty(email) || "your@email.com".equalsIgnoreCase(email);
    }
}