GroupMail v1.0

package me.CGA1123;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Set;
import java.util.UUID;
import java.util.logging.Logger;

import net.milkbowl.vault.permission.Permission;

import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.OfflinePlayer;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.player.PlayerJoinEvent;
import org.bukkit.plugin.RegisteredServiceProvider;
import org.bukkit.plugin.java.JavaPlugin;

public class GroupMail extends JavaPlugin implements Listener{

    private static final Logger log = Bukkit.getLogger();
    public static Permission permission;
    private boolean setupPermissions(){
        RegisteredServiceProvider<Permission> permissionProvider = getServer().getServicesManager().getRegistration(net.milkbowl.vault.permission.Permission.class);
        if (permissionProvider != null) {
            permission = permissionProvider.getProvider();
        }
        return (permission != null);
    }

    public boolean isInt(String s){
        try {
              Integer.parseInt(s);
              return true;
        } catch (NumberFormatException e) {
             return false;
        }
    }
    public void checkMail(Player p){
        //Check config if UUID is there.
        UUID id = p.getUniqueId();
        if(getConfig().getConfigurationSection("mails").getKeys(false).contains(id.toString())){
            int number = (this.getConfig().getConfigurationSection("mails."+id).getKeys(false)).size();
            p.sendMessage(prefix + "You have "+ ChatColor.GOLD + number+ChatColor.RESET + " unread message(s)");
        }

    }

    public String arrayToString(String[] message){
        StringBuilder builder = new StringBuilder();

        for (String string : message) {
            if (builder.length() > 0) {
                builder.append(" ");
            }
            builder.append(string);
        }

        return builder.toString();
    }
    public void displayMail(Player p){
        UUID id = p.getUniqueId();
        Set<String> allMails = this.getConfig().getConfigurationSection("mails."+id).getKeys(false);
        int number = (allMails).size();
        ArrayList<String> mails = new ArrayList<String>();
        p.sendMessage("===============" + prefix + "===============");
        p.sendMessage("You have "+  ChatColor.GOLD + number + ChatColor.RESET + " mail(s):");
        int i = 1;
        for(String s : allMails){
            mails.add("["+ i +"] "+ this.getConfig().getString("mails."+id+"."+s));
            i++;
        }

        for (String s : mails){
            p.sendMessage(ChatColor.translateAlternateColorCodes('§', s));
        }
        p.sendMessage("===============" + prefix + "===============");


    }
    public void sendGroupMessage(Player sender, String[] message, String group){
        String m = arrayToString(message);
        String senderName = sender.getDisplayName();
        String finalm = senderName + " => " + m;

        String world = sender.getWorld().getName();
        for(OfflinePlayer p1 : Bukkit.getServer().getOfflinePlayers()){
            if(permission.getPrimaryGroup(world, p1).equalsIgnoreCase(group)){
                //Player is in group
                //TODO If online send message saying received message, And add to config.
                UUID u = p1.getUniqueId();
                this.getConfig().set("mails."+u+"."+UUID.randomUUID(), finalm);
                if(p1.isOnline()){
                    sender.sendMessage(prefix + "You have received a message.");
                }
            }
        }
        saveConfig();
        sender.sendMessage(prefix + "Message sent!");
    }

    @Override
    public void onEnable(){
        if (!setupPermissions()) {
            log.severe(String.format("[%s] - Disabled due to no Vault dependency found!", getDescription().getName()));
            getServer().getPluginManager().disablePlugin(this);
            return;
        }
        setupPermissions();
        Bukkit.getServer().getPluginManager().registerEvents(this, this);
        this.getConfig().options().copyDefaults(true);
        saveDefaultConfig();

    }

    @Override
    public void onDisable() {
        saveDefaultConfig();
    }
    String prefix = ChatColor.translateAlternateColorCodes('&', this.getConfig().getString("prefix")) + ChatColor.RESET;
    String prefixraw = ChatColor.stripColor(prefix);

    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {

        if (cmd.getName().equalsIgnoreCase("gmail")) {
            if (!(sender instanceof Player)){
                log.info(prefixraw + "This is a player only command.");
                return true;
            }
            Player p = (Player) sender;
            String[] groups = permission.getGroups();
            if(args.length > 0){
                if (args[0].equalsIgnoreCase("read") || args[0].equalsIgnoreCase("send") || args[0].equalsIgnoreCase("del")){
                    if(args[0].equalsIgnoreCase("send")){
                        //Send
                        if(args.length >= 3){
                            String group = args[1];
                            String[] message = args;
                            message[0] = "";
                            message[1] = "";
                            if(Arrays.asList(groups).contains(group)){
                                if (p.hasPermission("gmail.send."+ group.toLowerCase())){
                                    sendGroupMessage(p, message, group);
                                    return true;
                                } else {
                                    p.sendMessage(prefix + "You do not have permission to send to that group.");
                                }
                            } else {
                                p.sendMessage(prefix+"The group : " + group + ", does not exist.");
                                return true;
                            }

                        } else {
                            p.sendMessage(prefix + "Usage: /gmail send <Group> <Message>");
                            return true;
                        }
                    } else if(args[0].equalsIgnoreCase("read")) {
                        //Read
                        UUID id = p.getUniqueId();
                        if(getConfig().getConfigurationSection("mails").getKeys(false).contains(id.toString())){
                            displayMail(p);
                            return true;
                        } else {
                            //No Mail
                            p.sendMessage(prefix + "You have no mail.");
                            return true;
                        }
                    } else {
                        //Delete
                        UUID id = p.getUniqueId();
                        if(getConfig().getConfigurationSection("mails").getKeys(false).contains(id.toString())){
                            ArrayList<String> allMails = new ArrayList<String>();
                            allMails.addAll(this.getConfig().getConfigurationSection("mails."+id).getKeys(false));
                            if(args.length == 2){
                                if(args[1].equalsIgnoreCase("all")){
                                    this.getConfig().set("mails."+id, null);
                                    saveConfig();
                                    p.sendMessage(prefix+ "All mails deleted");
                                    return true;
                                } else if( isInt(args[1])){
                                    //Delete a single message
                                    int msg = Integer.parseInt(args[1]);
                                    if(allMails.size() >= msg){
                                        this.getConfig().set("mails."+id+"."+allMails.get(msg-1), null);
                                        p.sendMessage(prefix+ "Message deleted.");
                                        saveConfig();
                                        return true;
                                    } else {
                                        p.sendMessage(prefix + "That mail does not exist.");
                                        p.sendMessage(prefix + "Usage: /gmail del <all || #>");
                                        return true;
                                    }
                                } else {
                                    p.sendMessage(prefix + "Usage: /gmail del <all || #>");
                                    return true;
                                }
                            } else {
                                p.sendMessage(prefix + "Usage: /gmail del <all || #>");
                                return true;
                            }
                        } else {
                            p.sendMessage(prefix + "You have no messages.");
                            return true;
                        }
                    }
                } else {
                    p.sendMessage(prefix + "Usage:");
                    p.sendMessage(prefix + "/gmail read");
                    p.sendMessage(prefix +"/gmail send <Group> <Message>");
                    return true;
                }
            } else {
                checkMail(p);
                p.sendMessage(prefix + "Usage:");
                p.sendMessage(prefix + "/gmail read");
                p.sendMessage(prefix + "/gmail send <Group> <Message>");
                return true;

            }

        }

        return false;
    }

    @EventHandler
    public void onJoin(PlayerJoinEvent e){
        checkMail(e.getPlayer());
    }
}