feat: model objectives, deployment zones, and victory conditions

src/Domain/DeploymentZone.php

@@ -0,0 +1,39 @@
+<?php
+
+declare(strict_types=1);
+
+namespace BattleForge\Domain;
+
+use InvalidArgumentException;
+
+final readonly class DeploymentZone
+{
+    /** @param list<Position> $positions */
+    public function __construct(
+        public string $teamId,
+        public array $positions,
+    ) {
+        if ($teamId === '') {
+            throw new InvalidArgumentException('Deployment zone team id cannot be empty.');
+        }
+
+        if ($positions === []) {
+            throw new InvalidArgumentException('Deployment zone must contain at least one position.');
+        }
+
+        if (!array_is_list($positions)) { // @phpstan-ignore function.alreadyNarrowedType (Runtime guard: PHPDoc is not a runtime contract for JSON-sourced arrays in Plan 4.)
+            throw new InvalidArgumentException('Deployment zone positions must be a list.');
+        }
+    }
+
+    public function contains(Position $position): bool
+    {
+        foreach ($this->positions as $candidate) {
+            if ($candidate->key() === $position->key()) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+}