feat: resolve objective control and objective victory

src/Domain/CombatEngine.php

@@ -180,12 +180,7 @@ final class CombatEngine
             actionLog: [...$match->actionLog, "{$endingTeamId} ended turn"],
         );
 
-        $winner = $this->resolveObjectiveVictory($next);
-        if ($winner !== null) {
-            $next = $next->withWinner($winner);
-        }
-
-        return $next;
+        return $this->resolveObjectiveVictory($next, $endingTeamId === $teamIds[0]);
     }
 
     /**
@@ -291,29 +286,39 @@ final class CombatEngine
         return $match->withWinner($actingTeamId);
     }
 
-    private function resolveObjectiveVictory(MatchState $match): ?string
+    /**
+     * @param bool $endingTeamIsFirstInOrder true when the team that just ended is the first team in
+     *                                       sorted team order; this identifies the first half of a round.
+     */
+    private function resolveObjectiveVictory(MatchState $match, bool $endingTeamIsFirstInOrder): MatchState
     {
         if ($match->victoryCondition !== VictoryCondition::HoldObjective || $match->objectives === []) {
-            return null;
+            return $match;
         }
 
+        $next = $match;
+
+        if ($endingTeamIsFirstInOrder) {
             /** @var list<ObjectiveMarker> $objectiveList */
             $objectiveList = array_values($match->objectives);
             $objective = $objectiveList[0];
             $controller = $this->objectiveController($match, $objective->position);
 
-        if ($controller === null) {
-            return null;
-        }
-
+            if ($controller !== null) {
                 $control = (new ObjectiveControl($match->objectiveControl))->recordRound($controller);
                 $next = $match->withObjectiveControl($control->roundsByTeam);
-
-        if (($control->roundsByTeam[$controller] ?? 0) >= $next->holdRoundsRequired) {
-            return $controller;
             }
 
-        return null;
+            return $next;
+        }
+
+        foreach ($match->objectiveControl as $teamId => $count) {
+            if ($count >= $match->holdRoundsRequired) {
+                return $next->withWinner($teamId);
+            }
+        }
+
+        return $next;
     }
 
     private function objectiveController(MatchState $match, Position $tile): ?string

tests/Unit/Domain/CombatEngineTest.php

@@ -9,9 +9,11 @@ use BattleForge\Domain\Battlefield;
 use BattleForge\Domain\CombatEngine;
 use BattleForge\Domain\CombatException;
 use BattleForge\Domain\MatchState;
+use BattleForge\Domain\ObjectiveMarker;
 use BattleForge\Domain\Position;
 use BattleForge\Domain\Terrain;
 use BattleForge\Domain\UnitState;
+use BattleForge\Domain\VictoryCondition;
 use InvalidArgumentException;
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
@@ -973,4 +975,65 @@ final class CombatEngineTest extends TestCase
 
         (new CombatEngine())->useAbility($match, 'scout-1', 'heal', new Position(0, 1));
     }
+
+    public function testEndTurnTalliesObjectiveControlAfterAFullRound(): void
+    {
+        $alpha = $this->unit('alpha-1', 'alpha', new Position(4, 4));
+        $bravo = $this->unit('bravo-1', 'bravo', new Position(7, 7));
+        $match = new MatchState(
+            new Battlefield(8, 8),
+            [$alpha, $bravo],
+            'alpha',
+            objectives: ['objective-1' => new ObjectiveMarker('objective-1', new Position(4, 4))],
+            victoryCondition: VictoryCondition::HoldObjective,
+            holdRoundsRequired: 2,
+        );
+
+        $afterAlphaEnd = (new CombatEngine())->endTurn($match);
+        $afterBravoEnd = (new CombatEngine())->endTurn($afterAlphaEnd);
+
+        self::assertSame(['alpha' => 1], $afterAlphaEnd->objectiveControl);
+        self::assertSame(['alpha' => 1], $afterBravoEnd->objectiveControl);
+        self::assertNull($afterBravoEnd->winnerTeamId);
+    }
+
+    public function testEndTurnDeclaresWinnerWhenHoldRoundsReached(): void
+    {
+        $alpha = $this->unit('alpha-1', 'alpha', new Position(4, 4));
+        $bravo = $this->unit('bravo-1', 'bravo', new Position(7, 7));
+        $match = new MatchState(
+            new Battlefield(8, 8),
+            [$alpha, $bravo],
+            'alpha',
+            objectives: ['objective-1' => new ObjectiveMarker('objective-1', new Position(4, 4))],
+            victoryCondition: VictoryCondition::HoldObjective,
+            holdRoundsRequired: 1,
+            objectiveControl: ['alpha' => 0],
+        );
+
+        $afterAlphaEnd = (new CombatEngine())->endTurn($match);
+        $afterBravoEnd = (new CombatEngine())->endTurn($afterAlphaEnd);
+
+        self::assertSame('alpha', $afterBravoEnd->winnerTeamId);
+        self::assertSame(['alpha' => 1], $afterBravoEnd->objectiveControl);
+    }
+
+    public function testEndTurnDoesNotAwardControlWhenNoTeamStandsOnTheObjective(): void
+    {
+        $alpha = $this->unit('alpha-1', 'alpha', new Position(0, 0));
+        $bravo = $this->unit('bravo-1', 'bravo', new Position(7, 7));
+        $match = new MatchState(
+            new Battlefield(8, 8),
+            [$alpha, $bravo],
+            'alpha',
+            objectives: ['objective-1' => new ObjectiveMarker('objective-1', new Position(4, 4))],
+            victoryCondition: VictoryCondition::HoldObjective,
+            holdRoundsRequired: 1,
+        );
+
+        $next = (new CombatEngine())->endTurn($match);
+
+        self::assertSame([], $next->objectiveControl);
+        self::assertNull($next->winnerTeamId);
+    }
 }