Fix non-integrable requirements crashing in cost requirements with spendResources true

(Which should be valid in the event the dev doesn't want to maximize)

src/game/requirements.tsx

@@ -101,6 +101,7 @@ export type CostRequirement = Replace<
         visibility: ProcessedComputable<Visibility.Visible | Visibility.None | boolean>;
         requiresPay: ProcessedComputable<boolean>;
         spendResources: ProcessedComputable<boolean>;
+        canMaximize: ProcessedComputable<boolean>;
     }
 >;
 
@@ -159,14 +160,33 @@ export function createCostRequirement<T extends CostRequirementOptions>(
             req.resource.value = Decimal.sub(req.resource.value, cost).max(0);
         });
 
-        req.canMaximize = req.cost instanceof Formula && req.cost.isInvertible();
+        req.canMaximize = computed(
+            () =>
+                req.cost instanceof Formula &&
+                req.cost.isInvertible() &&
+                (unref(req.spendResources) === false || req.cost.isIntegrable())
+        );
 
-        if (req.canMaximize) {
+        if (req.cost instanceof Formula && req.cost.isInvertible()) {
-            req.requirementMet = calculateMaxAffordable(
+            const maxAffordable = calculateMaxAffordable(
-                req.cost as InvertibleFormula,
+                req.cost,
                 req.resource,
                 unref(req.spendResources) as boolean
             );
+            req.requirementMet = computed(() => {
+                if (unref(req.canMaximize)) {
+                    return maxAffordable.value;
+                } else {
+                    if (req.cost instanceof Formula) {
+                        return Decimal.gte(req.resource.value, req.cost.evaluate());
+                    } else {
+                        return Decimal.gte(
+                            req.resource.value,
+                            unref(req.cost as ProcessedComputable<DecimalSource>)
+                        );
+                    }
+                }
+            });
         } else {
             req.requirementMet = computed(() => {
                 if (req.cost instanceof Formula) {

tests/game/requirements.test.ts

@@ -16,11 +16,14 @@ import { isRef, ref, unref } from "vue";
 import "../utils";
 
 describe("Creating cost requirement", () => {
+    let resource: Resource;
+    beforeAll(() => {
+        resource = createResource(ref(10));
+    });
+
     describe("Minimal requirement", () => {
-        let resource: Resource;
         let requirement: CostRequirement;
         beforeAll(() => {
-            resource = createResource(ref(10));
             requirement = createCostRequirement(() => ({
                 resource,
                 cost: 10,
@@ -46,10 +49,8 @@ describe("Creating cost requirement", () => {
     });
 
     describe("Fully customized", () => {
-        let resource: Resource;
         let requirement: CostRequirement;
         beforeAll(() => {
-            resource = createResource(ref(10));
             requirement = createCostRequirement(() => ({
                 resource,
                 cost: Formula.variable(resource).times(10),
@@ -73,7 +74,6 @@ describe("Creating cost requirement", () => {
     });
 
     test("Requirement met when meeting the cost", () => {
-        const resource = createResource(ref(10));
         const requirement = createCostRequirement(() => ({
             resource,
             cost: 10,
@@ -83,7 +83,6 @@ describe("Creating cost requirement", () => {
     });
 
     test("Requirement not met when not meeting the cost", () => {
-        const resource = createResource(ref(10));
         const requirement = createCostRequirement(() => ({
             resource,
             cost: 100,
@@ -91,6 +90,67 @@ describe("Creating cost requirement", () => {
         }));
         expect(unref(requirement.requirementMet)).toBe(false);
     });
+
+    describe("canMaximize works correctly", () => {
+        test("Cost function cannot maximize", () =>
+            expect(
+                unref(
+                    createCostRequirement(() => ({
+                        resource,
+                        cost: () => 10
+                    })).canMaximize
+                )
+            ).toBe(false));
+        test("Non-invertible formula cannot maximize", () =>
+            expect(
+                unref(
+                    createCostRequirement(() => ({
+                        resource,
+                        cost: Formula.variable(resource).abs()
+                    })).canMaximize
+                )
+            ).toBe(false));
+        test("Invertible formula can maximize if spendResources is false", () =>
+            expect(
+                unref(
+                    createCostRequirement(() => ({
+                        resource,
+                        cost: Formula.variable(resource).lambertw(),
+                        spendResources: false
+                    })).canMaximize
+                )
+            ).toBe(true));
+        test("Invertible formula cannot maximize if spendResources is true", () =>
+            expect(
+                unref(
+                    createCostRequirement(() => ({
+                        resource,
+                        cost: Formula.variable(resource).lambertw(),
+                        spendResources: true
+                    })).canMaximize
+                )
+            ).toBe(false));
+        test("Integrable formula can maximize if spendResources is false", () =>
+            expect(
+                unref(
+                    createCostRequirement(() => ({
+                        resource,
+                        cost: Formula.variable(resource).pow(2),
+                        spendResources: false
+                    })).canMaximize
+                )
+            ).toBe(true));
+        test("Integrable formula can maximize if spendResources is true", () =>
+            expect(
+                unref(
+                    createCostRequirement(() => ({
+                        resource,
+                        cost: Formula.variable(resource).pow(2),
+                        spendResources: true
+                    })).canMaximize
+                )
+            ).toBe(true));
+    });
 });
 
 describe("Creating visibility requirement", () => {