feat(progression): add tyrant unlock choices

src/main/java/games/dmg/spigottyrant/PurchaseResult.java

@@ -0,0 +1,10 @@
+package games.dmg.spigottyrant;
+
+import java.util.Objects;
+
+public record PurchaseResult(GameState state, PurchaseStatus status) {
+    public PurchaseResult {
+        Objects.requireNonNull(state, "state");
+        Objects.requireNonNull(status, "status");
+    }
+}

src/main/java/games/dmg/spigottyrant/PurchaseStatus.java

@@ -0,0 +1,9 @@
+package games.dmg.spigottyrant;
+
+public enum PurchaseStatus {
+    PURCHASED,
+    GAME_NOT_RUNNING,
+    NOT_TYRANT,
+    NO_CHOICES,
+    ALREADY_PURCHASED
+}

src/main/java/games/dmg/spigottyrant/SpigotTyrantPlugin.java

@@ -2,6 +2,7 @@ package games.dmg.spigottyrant;
 
 import java.io.IOException;
 import java.util.Map;
+import java.util.Objects;
 import java.util.logging.Level;
 import org.bukkit.plugin.java.JavaPlugin;
 
@@ -25,6 +26,8 @@ public final class SpigotTyrantPlugin extends JavaPlugin {
             return;
         }
 
+        Objects.requireNonNull(getCommand("tyrant"), "Missing tyrant command metadata")
+            .setExecutor(new TyrantCommand(stateManager, new TyrantProgressionService()));
         getServer().getScheduler().runTaskTimer(this, stateManager::saveIfDirty, 600L, 600L);
         getLogger().info("Spigot Tyrant enabled.");
     }

src/main/java/games/dmg/spigottyrant/TyrantCommand.java

@@ -0,0 +1,86 @@
+package games.dmg.spigottyrant;
+
+import java.util.Locale;
+import org.bukkit.ChatColor;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandExecutor;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+
+public final class TyrantCommand implements CommandExecutor {
+    private final TyrantStateManager stateManager;
+    private final TyrantProgressionService progression;
+
+    public TyrantCommand(
+        TyrantStateManager stateManager,
+        TyrantProgressionService progression
+    ) {
+        this.stateManager = stateManager;
+        this.progression = progression;
+    }
+
+    @Override
+    public boolean onCommand(
+        CommandSender sender,
+        Command command,
+        String label,
+        String[] arguments
+    ) {
+        if (!(sender instanceof Player player)) {
+            sender.sendMessage("This command must be used by a player.");
+            return true;
+        }
+        if (arguments.length == 0 || arguments[0].equalsIgnoreCase("choices")) {
+            showChoices(player);
+            return true;
+        }
+        if (arguments.length == 2 && arguments[0].equalsIgnoreCase("buy")) {
+            buy(player, arguments[1]);
+            return true;
+        }
+        player.sendMessage(ChatColor.YELLOW + "Usage: /tyrant choices | /tyrant buy <unlock>");
+        return true;
+    }
+
+    private void showChoices(Player player) {
+        GameState state = stateManager.game();
+        player.sendMessage(ChatColor.GOLD + "Tyrant unlock choices: " + state.unspentChoices());
+        for (TyrantUnlock unlock : TyrantUnlock.values()) {
+            String status;
+            if (state.purchases().contains(unlock)) {
+                status = "PURCHASED";
+            } else if (state.lifecycle() == GameLifecycle.RUNNING
+                    && state.tyrantId().filter(player.getUniqueId()::equals).isPresent()
+                    && state.unspentChoices() > 0) {
+                status = "AVAILABLE";
+            } else {
+                status = "LOCKED";
+            }
+            player.sendMessage(ChatColor.YELLOW + "[" + status + "] " + unlock.name());
+        }
+    }
+
+    private void buy(Player player, String requestedUnlock) {
+        TyrantUnlock unlock;
+        try {
+            unlock = TyrantUnlock.valueOf(requestedUnlock.toUpperCase(Locale.ROOT));
+        } catch (IllegalArgumentException exception) {
+            player.sendMessage(ChatColor.RED + "Unknown unlock. Use /tyrant choices.");
+            return;
+        }
+        PurchaseResult[] result = new PurchaseResult[1];
+        stateManager.updateGame(current -> {
+            result[0] = progression.purchase(current, player.getUniqueId(), unlock);
+            return result[0].state();
+        });
+        if (result[0].status() == PurchaseStatus.PURCHASED) {
+            stateManager.saveIfDirty();
+            player.sendMessage(ChatColor.GREEN + "Purchased " + unlock.name() + ".");
+        } else {
+            player.sendMessage(
+                ChatColor.RED + "Could not purchase " + unlock.name() + ": "
+                    + result[0].status().name().toLowerCase(Locale.ROOT).replace('_', ' ')
+            );
+        }
+    }
+}

src/main/java/games/dmg/spigottyrant/TyrantProgressionService.java

@@ -0,0 +1,75 @@
+package games.dmg.spigottyrant;
+
+import java.util.Optional;
+import java.util.UUID;
+
+public final class TyrantProgressionService {
+    public GameState recordVigilanteDeath(GameState state, Optional<UUID> killerId) {
+        if (state.lifecycle() != GameLifecycle.RUNNING
+                || state.tyrantId().isEmpty()
+                || state.vigilanteId().isEmpty()
+                || killerId.isEmpty()
+                || !state.tyrantId().orElseThrow().equals(killerId.orElseThrow())) {
+            return state;
+        }
+        return copyProgress(
+            state,
+            state.tyrantLevel() + 1,
+            state.unspentChoices() + 1,
+            state.purchases()
+        );
+    }
+
+    public PurchaseResult purchase(
+        GameState state,
+        UUID buyerId,
+        TyrantUnlock unlock
+    ) {
+        if (state.lifecycle() != GameLifecycle.RUNNING) {
+            return new PurchaseResult(state, PurchaseStatus.GAME_NOT_RUNNING);
+        }
+        if (state.tyrantId().isEmpty() || !state.tyrantId().orElseThrow().equals(buyerId)) {
+            return new PurchaseResult(state, PurchaseStatus.NOT_TYRANT);
+        }
+        if (state.purchases().contains(unlock)) {
+            return new PurchaseResult(state, PurchaseStatus.ALREADY_PURCHASED);
+        }
+        if (state.unspentChoices() == 0) {
+            return new PurchaseResult(state, PurchaseStatus.NO_CHOICES);
+        }
+        java.util.Set<TyrantUnlock> purchases = java.util.EnumSet.noneOf(TyrantUnlock.class);
+        purchases.addAll(state.purchases());
+        purchases.add(unlock);
+        GameState updated = copyProgress(
+            state,
+            state.tyrantLevel(),
+            state.unspentChoices() - 1,
+            purchases
+        );
+        return new PurchaseResult(updated, PurchaseStatus.PURCHASED);
+    }
+
+    public GameState resetReignProgression(GameState state) {
+        return copyProgress(state, 0, 0, java.util.Set.of());
+    }
+
+    private static GameState copyProgress(
+        GameState state,
+        int level,
+        int choices,
+        java.util.Set<TyrantUnlock> purchases
+    ) {
+        return new GameState(
+            state.lifecycle(),
+            state.tyrantId(),
+            state.vigilanteId(),
+            state.pendingTyrant(),
+            state.pendingVigilante(),
+            state.pausedAt(),
+            state.accumulatedPausedTime(),
+            level,
+            choices,
+            purchases
+        );
+    }
+}

src/main/resources/plugin.yml

@@ -4,3 +4,7 @@ main: games.dmg.spigottyrant.SpigotTyrantPlugin
 api-version: "1.20"
 description: Asymmetric Tyrant, Vigilante, Follower, and specialist class gameplay.
 author: dmg.games
+commands:
+  tyrant:
+    description: View and use Spigot Tyrant game features.
+    usage: /tyrant [choices|buy <unlock>]