Add /ma addreward command.

This command takes an arena player and a Thing as input. The Thing is
parsed in the same way as all other rewards are parsed, so it supports
the new `all()` and `random()` functions and the `nothing` keyword.

The "target audience" of the command is mainly scripts. It opens up the
possibility of hooking into MobArena's rewards from command blocks or
other plugins, but with very low coupling.

Closes #643

src/main/java/com/garbagemule/MobArena/commands/CommandHandler.java

@@ -4,6 +4,7 @@ import com.garbagemule.MobArena.ConfigError;
 import com.garbagemule.MobArena.Messenger;
 import com.garbagemule.MobArena.MobArena;
 import com.garbagemule.MobArena.Msg;
+import com.garbagemule.MobArena.commands.admin.AddRewardCommand;
 import com.garbagemule.MobArena.commands.admin.DisableCommand;
 import com.garbagemule.MobArena.commands.admin.EnableCommand;
 import com.garbagemule.MobArena.commands.admin.ForceCommand;
@@ -319,6 +320,7 @@ public class CommandHandler implements CommandExecutor, TabCompleter
         register(ForceCommand.class);
         register(KickCommand.class);
         register(RestoreCommand.class);
+        register(AddRewardCommand.class);
 
         // mobarena.setup
         register(SetupCommand.class);

src/main/java/com/garbagemule/MobArena/commands/admin/AddRewardCommand.java

@@ -0,0 +1,91 @@
+package com.garbagemule.MobArena.commands.admin;
+
+import com.garbagemule.MobArena.Msg;
+import com.garbagemule.MobArena.commands.Command;
+import com.garbagemule.MobArena.commands.CommandInfo;
+import com.garbagemule.MobArena.framework.Arena;
+import com.garbagemule.MobArena.framework.ArenaMaster;
+import com.garbagemule.MobArena.things.Thing;
+import com.garbagemule.MobArena.things.ThingPicker;
+import org.bukkit.ChatColor;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import java.util.stream.Collectors;
+
+@CommandInfo(
+    name    = "addreward",
+    pattern = "addreward",
+    usage   = "/ma addreward <player> <thing>",
+    desc    = "add a reward to an arena player's rewards list",
+    permission = "mobarena.admin.addreward"
+)
+public class AddRewardCommand implements Command {
+
+    @Override
+    public boolean execute(ArenaMaster am, CommandSender sender, String... args) {
+        if (args.length < 2) {
+            return false;
+        }
+
+        Player player = am.getPlugin().getServer().getPlayer(args[0]);
+        if (player == null) {
+            am.getGlobalMessenger().tell(sender, "Player not found.");
+            return true;
+        }
+
+        Arena arena = am.getArenaWithPlayer(player);
+        if (arena == null) {
+            am.getGlobalMessenger().tell(sender, "That player is not in an arena.");
+            return true;
+        }
+        if (!arena.isRunning()) {
+            am.getGlobalMessenger().tell(sender, "That arena is not running.");
+            return true;
+        }
+        if (!arena.getPlayersInArena().contains(player)) {
+            am.getGlobalMessenger().tell(sender, "That player is not an arena player.");
+            return true;
+        }
+
+        String[] rest = Arrays.copyOfRange(args, 1, args.length);
+        String input = String.join(" ", rest);
+
+        Thing thing;
+        try {
+            ThingPicker picker = am.getPlugin().getThingPickerManager().parse(input);
+            thing = picker.pick();
+        } catch (Exception e) {
+            am.getGlobalMessenger().tell(sender, e.getMessage());
+            return true;
+        }
+
+        arena.getRewardManager().addReward(player, thing);
+        arena.getMessenger().tell(player, Msg.WAVE_REWARD, thing.toString());
+
+        String msg = "Added " + ChatColor.YELLOW + thing + ChatColor.RESET + " to " + ChatColor.YELLOW + player.getName() + "'s" + ChatColor.RESET + " rewards.";
+        am.getGlobalMessenger().tell(sender, msg);
+
+        return true;
+    }
+
+    @Override
+    public List<String> tab(ArenaMaster am, Player player, String... args) {
+        if (args.length > 1) {
+            return Collections.emptyList();
+        }
+
+        String prefix = args[0].toLowerCase();
+
+        List<Player> players = am.getAllPlayers();
+
+        return players.stream()
+            .filter(p -> p.getName().toLowerCase().startsWith(prefix))
+            .map(Player::getName)
+            .collect(Collectors.toList());
+    }
+
+}

src/main/resources/plugin.yml

@@ -46,6 +46,7 @@ permissions:
             mobarena.admin.restore: true
             mobarena.admin.force: true
             mobarena.admin.teleport: true
+            mobarena.admin.addreward: true
     mobarena.admin.enable:
         description: Enable and disable MobArena and/or arenas.
         default: false
@@ -61,6 +62,9 @@ permissions:
     mobarena.admin.teleport:
         description: Immune to teleport blocking rules.
         default: false
+    mobarena.admin.addreward:
+        description: Add rewards to an arena player's reward list.
+        default: false
 
     mobarena.setup:
         description: Gives access to all setup commands