Add prerequisites to powerups. Create a template for "free X" powerups. Add free bus

The "free X" powerups now only appear if you have at least one of the item, and also stop appearing once you have 100

constants.js

@@ -302,7 +302,9 @@ function createTemplateUpgrades() {
   createHelperUpgrades();
   createClickVictimUpgrades();
   createPowerupFreqUpgrades();
+  createFreeBuildingPowerups();
   deepFreeze(upgrades);
+  deepFreeze(powerups);
 }
 
 const prodUpgradeCounts = [1, 5, 10, 25, 50, 75, 100];
@@ -1198,27 +1200,19 @@ const powerups = {
     name: "Free Food",
     description: "Tasty!",
     icon: "fa-drumstick-bite",
+    prereqs: state => true,
     effect: state => state.resources.food += state.currentProductivity.food * 60,
     popup: (self, e) => {
       clickPopup("GULP!", "gulp", [e.clientX, e.clientY]);
       clickPopup("+60 seconds of food", "food", [e.clientX, e.clientY]);
     }
   },
-  "free-car": {
-    name: "Free Car",
-    description: "It's FREE!",
-    icon: "fa-car",
-    effect: state => state.belongings.car.count += 1,
-    popup: (self, e) => {
-      clickPopup("CAR!", "gulp", [e.clientX, e.clientY]);
-      clickPopup("+1 car", "food", [e.clientX, e.clientY]);
-    }
-  },
   "double": {
     name: "Double Dip",
     description: "Doubled productivity!",
     icon: "fa-cogs",
     duration: 10000,
+    prereqs: state => true,
     effect: state => state.currentProductivity.food *= 2,
     popup: (self, e) => {
       clickPopup("VROOM!", "gulp", [e.clientX, e.clientY]);
@@ -1226,6 +1220,32 @@ const powerups = {
   }
 }
 
+function createFreeBuildingPowerups() {
+  const prefix = "free-";
+  Object.entries(freeBuildingPowerupText).forEach(([building, text]) => {
+    const key = prefix + building;
+
+    powerups[key] = {
+      name: text.name,
+      description: text.desc,
+      icon: buildings[building].icon,
+      prereqs: state => state.belongings[building].count > 0 && state.belongings[building].count < 100,
+      effect: state => state.belongings[building].count += 1,
+      popup: (self, e) => clickPopup("+1 " + buildings[building].name, "food", [e.clientX, e.clientY])
+    }
+  });
+}
+
+const freeBuildingPowerupText = {
+  car: {
+    name: "Free Car",
+    desc: "It's FREE!"
+  },
+  bus: {
+    name: "Deserted Bus",
+    desc: "Just kidding. It's full of people."
+  }
+}
 deepFreeze(prodUpgradeText);
 deepFreeze(prodAllUpgradeText);
 deepFreeze(clickUpgradeText);

gorge.js

@@ -984,8 +984,16 @@ function doPowerup() {
 
   const choices = [];
 
+  const state = {
+    ownedUpgrades: ownedUpgrades,
+    resources: resources,
+    currentProductivity: currentProductivity,
+    belongings: belongings
+  };
+
   Object.entries(powerups).forEach(([key, val]) => {
-    choices.push(key);
+    if (val.prereqs(state))
+      choices.push(key);
   });
 
   const choice = Math.floor(Math.random() * choices.length);
@@ -1015,13 +1023,6 @@ function doPowerup() {
     doPowerup();
   }, delay);
 
-  const state = {
-    ownedUpgrades: ownedUpgrades,
-    resources: resources,
-    currentProductivity: currentProductivity,
-    belongings: belongings
-  };
-
   button.addEventListener("mousedown", e => {
     if (powerup.duration !== undefined) {
       addPowerup(powerup);