Select only powers that are in end game

We were selecting powers to play as randomly, but sometimes they'd lose
mid game, making the rest of the game very boring.

Author: Tylermarques

ai_animation/src/gameState.ts

@@ -20,13 +20,36 @@ enum AvailableMaps {
 
 /**
  * Return a random power from the PowerENUM for the player to control
+ * Only returns powers that have more than 2 supply centers in the last phase
  */
-function getRandomPower(): PowerENUM {
-  const values = Object.values(PowerENUM).filter(power =>
+function getRandomPower(gameData?: GameSchemaType): PowerENUM {
+  const allPowers = Object.values(PowerENUM).filter(power =>
     power !== PowerENUM.GLOBAL && power !== PowerENUM.EUROPE
   );
-  const idx = Math.floor(Math.random() * values.length);
-  return values[idx];
+  
+  // If no game data provided, return any random power
+  if (!gameData || !gameData.phases || gameData.phases.length === 0) {
+    const idx = Math.floor(Math.random() * allPowers.length);
+    return allPowers[idx];
+  }
+  
+  // Get the last phase to check supply centers
+  const lastPhase = gameData.phases[gameData.phases.length - 1];
+  
+  // Filter powers that have more than 2 supply centers
+  const eligiblePowers = allPowers.filter(power => {
+    const centers = lastPhase.state?.centers?.[power];
+    return centers && centers.length > 2;
+  });
+  
+  // If no powers have more than 2 centers, fall back to any power
+  if (eligiblePowers.length === 0) {
+    const idx = Math.floor(Math.random() * allPowers.length);
+    return allPowers[idx];
+  }
+  
+  const idx = Math.floor(Math.random() * eligiblePowers.length);
+  return eligiblePowers[idx];
 }
 
 function loadFileFromServer(filePath: string): Promise<string> {
@@ -155,8 +178,8 @@ class GameState {
           playBtn.disabled = false;
           speedSelector.disabled = false;
 
-          // Set the poewr if the game specifies it, else random.
-          this.currentPower = this.gameData.power !== undefined ? this.gameData.power : getRandomPower();
+          // Set the power if the game specifies it, else random.
+          this.currentPower = this.gameData.power !== undefined ? this.gameData.power : getRandomPower(this.gameData);
 
 
           const momentsFilePath = `./games/${this.gameId}/moments.json`;