From 1ccdbeeadcbe3ef3e37a7b54ce203201e78b21cf Mon Sep 17 00:00:00 2001
From: ducdat0507 <62660527+ducdat0507@users.noreply.github.com>
Date: Wed, 14 Dec 2022 19:55:32 +0700
Subject: [PATCH] (DISABLE AUTOSAVE BEFORE UPDATING) Rough max buy
 implementation

---
 src/data/layers/boxes.tsx | 77 +++++++++++++++++++++++++++++++++++-
 src/data/layers/cloth.tsx | 25 ++++++++++--
 src/data/layers/coal.tsx  | 83 +++++++++++++++++++++++++++++++++++----
 src/data/layers/dyes.tsx  | 18 ++++++++-
 src/data/layers/elves.tsx | 77 +++++++++++++++++++-----------------
 src/data/layers/metal.tsx | 40 +++++++++++++++++--
 src/data/layers/oil.tsx   | 58 ++++++++++++++++++++++++---
 src/data/layers/paper.tsx | 26 +++++++++++-
 src/data/layers/trees.tsx | 37 +++++++++++++++--
 9 files changed, 377 insertions(+), 64 deletions(-)

diff --git a/src/data/layers/boxes.tsx b/src/data/layers/boxes.tsx
index 8a1f27c..34a5884 100644
--- a/src/data/layers/boxes.tsx
+++ b/src/data/layers/boxes.tsx
@@ -27,6 +27,7 @@ import { WithRequired } from "util/common";
 import { render, renderGrid, renderRow } from "util/vue";
 import { computed, ComputedRef, ref, unref } from "vue";
 import dyes from "./dyes";
+import { ElfBuyable } from "./elves";
 import management from "./management";
 import paper from "./paper";
 import plastic from "./plastic";
@@ -34,7 +35,7 @@ import trees from "./trees";
 import workshop from "./workshop";
 import wrappingPaper from "./wrapping-paper";
 
-export type BoxesBuyable = GenericBuyable & {
+export type BoxesBuyable = ElfBuyable & {
     resource: Resource;
     freeLevels: ComputedRef<DecimalSource>;
     totalAmount: ComputedRef<Decimal>;
@@ -231,6 +232,19 @@ const layer = createLayer(id, function (this: BaseLayer) {
                 .div(dyes.boosts.orange2.value)
                 .div(wrappingPaper.boosts.ocean1.value);
         },
+        inverseCost(x: DecimalSource) {
+            let scaling = 3;
+            if (management.elfTraining.boxElfTraining.milestones[2].earned.value) {
+                scaling--;
+            }
+
+            let v = Decimal.mul(x, wrappingPaper.boosts.ocean1.value)
+                .mul(dyes.boosts.orange2.value)
+                .div(100).log(scaling);
+
+            v = v.div(Decimal.pow(0.95, paper.books.boxBook.totalAmount.value));
+            return Decimal.isNaN(v) ? Decimal.dZero : v.floor().max(0);
+        },
         visibility: () => showIf(logsUpgrade.bought.value),
         freeLevels: computed(() =>
             management.elfTraining.boxElfTraining.milestones[0].earned.value
@@ -275,6 +289,18 @@ const layer = createLayer(id, function (this: BaseLayer) {
             }
             return Decimal.pow(scaling, v).times(1000).div(dyes.boosts.orange2.value);
         },
+        inverseCost(x: DecimalSource) {
+            let scaling = 5;
+            if (management.elfTraining.boxElfTraining.milestones[2].earned.value) {
+                scaling--;
+            }
+
+            let v = Decimal.mul(x, dyes.boosts.orange2.value)
+                .div(1000).log(scaling);
+
+            v = v.div(Decimal.pow(0.95, paper.books.boxBook.totalAmount.value));
+            return Decimal.isNaN(v) ? Decimal.dZero : v.floor().max(0);
+        },
         visibility: () => showIf(ashUpgrade.bought.value),
         freeLevels: computed(() =>
             management.elfTraining.boxElfTraining.milestones[0].earned.value
@@ -319,6 +345,18 @@ const layer = createLayer(id, function (this: BaseLayer) {
             }
             return Decimal.pow(scaling, v).times(1000).div(dyes.boosts.orange2.value);
         },
+        inverseCost(x: DecimalSource) {
+            let scaling = 7;
+            if (management.elfTraining.boxElfTraining.milestones[2].earned.value) {
+                scaling--;
+            }
+
+            let v = Decimal.mul(x, dyes.boosts.orange2.value)
+                .div(1000).log(scaling);
+
+            v = v.div(Decimal.pow(0.95, paper.books.boxBook.totalAmount.value));
+            return Decimal.isNaN(v) ? Decimal.dZero : v.floor().max(0);
+        },
         visibility: () => showIf(coalUpgrade.bought.value),
         freeLevels: computed(() =>
             management.elfTraining.boxElfTraining.milestones[0].earned.value
@@ -367,6 +405,19 @@ const layer = createLayer(id, function (this: BaseLayer) {
                 .div(dyes.boosts.orange2.value)
                 .div(wrappingPaper.boosts.ocean1.value);
         },
+        inverseCost(x: DecimalSource) {
+            let scaling = 10;
+            if (management.elfTraining.boxElfTraining.milestones[2].earned.value) {
+                scaling--;
+            }
+
+            let v = Decimal.mul(x, wrappingPaper.boosts.ocean1.value)
+                .mul(dyes.boosts.orange2.value)
+                .div(1e25).log(scaling);
+
+            v = v.div(Decimal.pow(0.95, paper.books.boxBook.totalAmount.value));
+            return Decimal.isNaN(v) ? Decimal.dZero : v.floor().max(0);
+        },
         visibility: () => showIf(management.elfTraining.boxElfTraining.milestones[3].earned.value),
         freeLevels: computed(() =>
             management.elfTraining.boxElfTraining.milestones[0].earned.value
@@ -411,6 +462,18 @@ const layer = createLayer(id, function (this: BaseLayer) {
             }
             return Decimal.pow(scaling, v).times(1e28).div(dyes.boosts.orange2.value);
         },
+        inverseCost(x: DecimalSource) {
+            let scaling = 15;
+            if (management.elfTraining.boxElfTraining.milestones[2].earned.value) {
+                scaling--;
+            }
+
+            let v = Decimal.mul(x, dyes.boosts.orange2.value)
+                .div(1e28).log(scaling);
+
+            v = v.div(Decimal.pow(0.95, paper.books.boxBook.totalAmount.value));
+            return Decimal.isNaN(v) ? Decimal.dZero : v.floor().max(0);
+        },
         visibility: () => showIf(management.elfTraining.boxElfTraining.milestones[3].earned.value),
         freeLevels: computed(() =>
             management.elfTraining.boxElfTraining.milestones[0].earned.value
@@ -455,6 +518,18 @@ const layer = createLayer(id, function (this: BaseLayer) {
             }
             return Decimal.pow(scaling, v).times(1000).div(dyes.boosts.orange2.value);
         },
+        inverseCost(x: DecimalSource) {
+            let scaling = 20;
+            if (management.elfTraining.boxElfTraining.milestones[2].earned.value) {
+                scaling--;
+            }
+
+            let v = Decimal.mul(x, dyes.boosts.orange2.value)
+                .div(1000).log(scaling);
+
+            v = v.div(Decimal.pow(0.95, paper.books.boxBook.totalAmount.value));
+            return Decimal.isNaN(v) ? Decimal.dZero : v.floor().max(0);
+        },
         visibility: () => showIf(management.elfTraining.boxElfTraining.milestones[3].earned.value),
         freeLevels: computed(() =>
             management.elfTraining.boxElfTraining.milestones[0].earned.value
diff --git a/src/data/layers/cloth.tsx b/src/data/layers/cloth.tsx
index 6fdbf41..3d910b0 100644
--- a/src/data/layers/cloth.tsx
+++ b/src/data/layers/cloth.tsx
@@ -30,6 +30,7 @@ import { render, renderCol, renderRow } from "util/vue";
 import { computed, ref } from "vue";
 import boxes from "./boxes";
 import dyes from "./dyes";
+import { ElfBuyable } from "./elves";
 import management from "./management";
 import metal from "./metal";
 import paper from "./paper";
@@ -188,11 +189,17 @@ const layer = createLayer(id, function (this: BaseLayer) {
             v = Decimal.pow(0.95, paper.books.clothBook.totalAmount.value).times(v);
             return Decimal.pow(1.5, v).times(1e14);
         },
+        inverseCost(x: DecimalSource) {
+            let v = Decimal.div(x, 1e14).log(1.5);
+            v = v.div(Decimal.pow(0.95, paper.books.clothBook.totalAmount.value));
+            if (Decimal.gte(v, 100)) v = Decimal.mul(v, 100).root(2);
+            return Decimal.isNaN(v) ? Decimal.dZero : v.floor().max(0);
+        },
         display: {
             title: "Build more pens",
             description: "Breed +1 sheep at once"
         }
-    })) as GenericBuyable & { resource: Resource };
+    })) as ElfBuyable & { resource: Resource };
 
     const betterShears = createBuyable(() => ({
         resource: metal.metal,
@@ -202,11 +209,17 @@ const layer = createLayer(id, function (this: BaseLayer) {
             v = Decimal.pow(0.95, paper.books.clothBook.totalAmount.value).times(v);
             return Decimal.pow(1.4, v).times(10000);
         },
+        inverseCost(x: DecimalSource) {
+            let v = Decimal.div(x, 10000).log(1.4);
+            v = v.div(Decimal.pow(0.95, paper.books.clothBook.totalAmount.value));
+            if (Decimal.gte(v, 100)) v = Decimal.mul(v, 100).root(2);
+            return Decimal.isNaN(v) ? Decimal.dZero : v.floor().max(0);
+        },
         display: {
             title: "Make stronger shears",
             description: "Shear +1 sheep at once"
         }
-    })) as GenericBuyable & { resource: Resource };
+    })) as ElfBuyable & { resource: Resource };
 
     const fasterSpinning = createBuyable(() => ({
         resource: paper.paper,
@@ -216,11 +229,17 @@ const layer = createLayer(id, function (this: BaseLayer) {
             v = Decimal.pow(0.95, paper.books.clothBook.totalAmount.value).times(v);
             return Decimal.pow(1.3, v).times(1000000);
         },
+        inverseCost(x: DecimalSource) {
+            let v = Decimal.div(x, 1000000).log(1.3);
+            v = v.div(Decimal.pow(0.95, paper.books.clothBook.totalAmount.value));
+            if (Decimal.gte(v, 100)) v = Decimal.mul(v, 100).root(2);
+            return Decimal.isNaN(v) ? Decimal.dZero : v.floor().max(0);
+        },
         display: {
             title: "Learn how to spin",
             description: "Spin +1 wool at once"
         }
-    })) as GenericBuyable & { resource: Resource };
+    })) as ElfBuyable & { resource: Resource };
 
     const treesUpgrade1 = createUpgrade(() => ({
         resource: noPersist(cloth),
diff --git a/src/data/layers/coal.tsx b/src/data/layers/coal.tsx
index d2a84da..b8ac8ed 100644
--- a/src/data/layers/coal.tsx
+++ b/src/data/layers/coal.tsx
@@ -33,7 +33,7 @@ import { render, renderGrid, renderRow } from "util/vue";
 import { computed, ref, unref } from "vue";
 import boxes from "./boxes";
 import cloth from "./cloth";
-import elves from "./elves";
+import elves, { ElfBuyable } from "./elves";
 import metal from "./metal";
 import oil from "./oil";
 import paper from "./paper";
@@ -103,6 +103,14 @@ const layer = createLayer(id, function (this: BaseLayer) {
             v = Decimal.pow(0.95, paper.books.smallFireBook.totalAmount.value).times(v);
             return v.pow(1.5).times(1e4);
         },
+        inverseCost(x: DecimalSource) {
+            let v = Decimal.div(x, 1e4).root(1.5);
+            v = v.div(Decimal.pow(0.95, paper.books.smallFireBook.totalAmount.value));
+            if (Decimal.gte(v, 10000)) v = Decimal.mul(v, 10000).root(2);
+            if (Decimal.gte(v, 100)) v = Decimal.mul(v, 100).root(2);
+            v = v.sub(Decimal.times(buildBonfire.amount.value, unref(buildBonfire.cost!)));
+            return Decimal.isNaN(v) ? Decimal.dZero : v.floor().max(0);
+        },
         display: jsx(() => (
             <>
                 <h3>Small Fire</h3>
@@ -126,7 +134,7 @@ const layer = createLayer(id, function (this: BaseLayer) {
             color: colorText,
             width: "160px"
         }
-    })) as GenericBuyable & { resource: Resource };
+    })) as ElfBuyable & { resource: Resource };
 
     const {
         min: minFire,
@@ -160,6 +168,9 @@ const layer = createLayer(id, function (this: BaseLayer) {
         cost() {
             return Decimal.pow(0.95, paper.books.bonfireBook.totalAmount.value).times(10);
         },
+        inverseCost(x: DecimalSource) {
+            return Decimal.div(x, Decimal.pow(0.95, paper.books.bonfireBook.totalAmount.value).times(10)).floor();
+        },
         display: jsx(() => (
             <>
                 <h3>Bonfire</h3>
@@ -185,7 +196,7 @@ const layer = createLayer(id, function (this: BaseLayer) {
             width: "160px"
         },
         visibility: () => showIf(unlockBonfire.bought.value)
-    })) as GenericBuyable & { resource: Resource };
+    })) as ElfBuyable & { resource: Resource };
     const {
         min: minBonfire,
         max: maxBonfire,
@@ -220,6 +231,13 @@ const layer = createLayer(id, function (this: BaseLayer) {
             v = Decimal.pow(0.95, paper.books.kilnBook.totalAmount.value).times(v);
             return Decimal.pow(1.1, v).times(1e7);
         },
+        inverseCost(x: DecimalSource) {
+            let v = Decimal.div(x, 1e7).log(1.1);
+            v = v.div(Decimal.pow(0.95, paper.books.kilnBook.totalAmount.value));
+            if (Decimal.gte(v, 10000)) v = Decimal.mul(v, 10000).root(2);
+            if (Decimal.gte(v, 100)) v = Decimal.mul(v, 100).root(2);
+            return Decimal.isNaN(v) ? Decimal.dZero : v.floor().max(0);
+        },
         display: jsx(() => (
             <>
                 <h3>Charcoal Kiln</h3>
@@ -244,7 +262,7 @@ const layer = createLayer(id, function (this: BaseLayer) {
             width: "160px"
         },
         visibility: () => showIf(unlockKiln.bought.value)
-    })) as GenericBuyable & { resource: Resource };
+    })) as ElfBuyable & { resource: Resource };
     const {
         min: minKiln,
         max: maxKiln,
@@ -281,6 +299,19 @@ const layer = createLayer(id, function (this: BaseLayer) {
             }
             return cost;
         },
+        inverseCost(x: DecimalSource) {
+            if (management.elfTraining.coalDrillElfTraining.milestones[2].earned.value) {
+                x = Decimal.div(x, 10);
+            }
+            if (management.elfTraining.fertilizerElfTraining.milestones[2].earned.value) {
+                x = Decimal.div(x, Decimal.add(trees.totalLogs.value, Math.E).ln());
+            }
+            let v = Decimal.div(x, 10).log(1.15);
+            v = v.div(Decimal.pow(0.95, paper.books.coalDrillBook.totalAmount.value));
+            if (Decimal.gte(v, 10000)) v = Decimal.mul(v, 10000).root(2);
+            if (Decimal.gte(v, 100)) v = Decimal.mul(v, 100).root(2);
+            return Decimal.isNaN(v) ? Decimal.dZero : v.floor().max(0);
+        },
         display: jsx(() => (
             <>
                 <h3>Coal Drill</h3>
@@ -303,7 +334,7 @@ const layer = createLayer(id, function (this: BaseLayer) {
             width: "160px"
         },
         visibility: () => showIf(metal.coalDrill.bought.value)
-    })) as GenericBuyable & { resource: Resource };
+    })) as ElfBuyable & { resource: Resource };
     const {
         max: maxDrill,
         min: minDrill,
@@ -470,6 +501,18 @@ const layer = createLayer(id, function (this: BaseLayer) {
             v = v.div(wrappingPaper.boosts.rainbow1.value);
             return Decimal.add(v, 1).pow(2.5).times(10);
         },
+        inverseCost(x: DecimalSource) {
+            let v = Decimal.div(x, 10).root(2.5).sub(1);
+            v = v.mul(wrappingPaper.boosts.rainbow1.value);
+            if (management.elfTraining.heatedCutterElfTraining.milestones[0].earned.value) {
+                v = v.div(Decimal.pow(0.95, paper.books.heatedCuttersBook.totalAmount.value));
+            }
+            v = v.div(Decimal.pow(0.95, paper.books.heatedCuttersBook.totalAmount.value));
+            if (Decimal.gte(v, 2e6)) v = Decimal.mul(v, 2e6).root(2);
+            if (Decimal.gte(v, 200)) v = Decimal.mul(v, 200).root(2);
+            if (Decimal.gte(v, 50)) v = Decimal.mul(v, 50).root(2);
+            return Decimal.isNaN(v) ? Decimal.dZero : v.floor().max(0);
+        },
         display: {
             title: "Heated Cutters",
             description: "Even warmer cutters cut down trees faster",
@@ -479,7 +522,7 @@ const layer = createLayer(id, function (this: BaseLayer) {
         },
         style: { color: colorText },
         visibility: () => showIf(warmerCutters.bought.value)
-    })) as GenericBuyable & { display: { title: string }; resource: Resource };
+    })) as ElfBuyable & { display: { title: string }; resource: Resource };
     const heatedPlanters = createBuyable(() => ({
         resource: noPersist(coal),
         cost() {
@@ -494,6 +537,18 @@ const layer = createLayer(id, function (this: BaseLayer) {
             v = v.div(wrappingPaper.boosts.rainbow1.value);
             return Decimal.add(v, 1).pow(2.5).times(10);
         },
+        inverseCost(x: DecimalSource) {
+            let v = Decimal.div(x, 10).root(2.5).sub(1);
+            v = v.mul(wrappingPaper.boosts.rainbow1.value);
+            if (management.elfTraining.heatedPlanterElfTraining.milestones[0].earned.value) {
+                v = v.div(Decimal.pow(0.95, paper.books.heatedPlantersBook.totalAmount.value));
+            }
+            v = v.div(Decimal.pow(0.95, paper.books.heatedPlantersBook.totalAmount.value));
+            if (Decimal.gte(v, 2e6)) v = Decimal.mul(v, 2e6).root(2);
+            if (Decimal.gte(v, 200)) v = Decimal.mul(v, 200).root(2);
+            if (Decimal.gte(v, 50)) v = Decimal.mul(v, 50).root(2);
+            return Decimal.isNaN(v) ? Decimal.dZero : v.floor().max(0);
+        },
         display: {
             title: "Heated Planters",
             description: "Even warmer planters plant trees faster",
@@ -503,7 +558,7 @@ const layer = createLayer(id, function (this: BaseLayer) {
         },
         style: { color: colorText },
         visibility: () => showIf(warmerPlanters.bought.value)
-    })) as GenericBuyable & { display: { title: string }; resource: Resource };
+    })) as ElfBuyable & { display: { title: string }; resource: Resource };
     const moreFertilizer = createBuyable(() => ({
         resource: noPersist(ash),
         cost() {
@@ -518,6 +573,18 @@ const layer = createLayer(id, function (this: BaseLayer) {
             v = v.div(wrappingPaper.boosts.rainbow1.value);
             return Decimal.add(v, 1).pow(1.5).times(50000);
         },
+        inverseCost(x: DecimalSource) {
+            let v = Decimal.div(x, 50000).root(1.5).sub(1);
+            v = v.mul(wrappingPaper.boosts.rainbow1.value);
+            if (management.elfTraining.fertilizerElfTraining.milestones[0].earned.value) {
+                v = v.div(Decimal.pow(0.95, paper.books.fertilizerBook.totalAmount.value));
+            }
+            v = v.div(Decimal.pow(0.95, paper.books.fertilizerBook.totalAmount.value));
+            if (Decimal.gte(v, 2e6)) v = Decimal.mul(v, 2e6).root(2);
+            if (Decimal.gte(v, 200)) v = Decimal.mul(v, 200).root(2);
+            if (Decimal.gte(v, 50)) v = Decimal.mul(v, 50).root(2);
+            return Decimal.isNaN(v) ? Decimal.dZero : v.floor().max(0);
+        },
         display: {
             title: "Fertilized Soil",
             description: "More fertilizer helps trees grow bigger",
@@ -527,7 +594,7 @@ const layer = createLayer(id, function (this: BaseLayer) {
         },
         style: { color: colorText },
         visibility: () => showIf(basicFertilizer.bought.value)
-    })) as GenericBuyable & { display: { title: string }; resource: Resource };
+    })) as ElfBuyable & { display: { title: string }; resource: Resource };
     const row3buyables = [heatedCutters, heatedPlanters, moreFertilizer];
 
     const heatedCutterEffect = createSequentialModifier(() => [
diff --git a/src/data/layers/dyes.tsx b/src/data/layers/dyes.tsx
index 93f461c..4d7a5b6 100644
--- a/src/data/layers/dyes.tsx
+++ b/src/data/layers/dyes.tsx
@@ -32,12 +32,13 @@ import trees from "./trees";
 import wrappingPaper from "./wrapping-paper";
 import paper from "./paper";
 import boxes from "./boxes";
+import { ElfBuyable } from "./elves";
 
 interface Dye {
     name: string;
     amount: Resource<DecimalSource> &
         Persistent<DecimalSource> & { [NonPersistent]: Resource<DecimalSource> };
-    buyable: GenericBuyable;
+    buyable: ElfBuyable;
     toGenerate: WithRequired<Modifier, "description" | "revert">;
     computedToGenerate: ComputedRef<DecimalSource>;
     display: JSXFunction;
@@ -184,7 +185,7 @@ const layer = createLayer(id, function (this: BaseLayer) {
         }) as WithRequired<Modifier, "description" | "revert">;
         const computedToGenerate = computed(() => toGenerate.apply(0));
 
-        const buyable: GenericBuyable = createBuyable(() => {
+        const buyable: ElfBuyable = createBuyable(() => {
             const costs = convertComputable(options.costs);
             return {
                 ...options,
@@ -243,6 +244,19 @@ const layer = createLayer(id, function (this: BaseLayer) {
                     v = Decimal.mul(v, Decimal.pow(0.95, paper.books.dyeBook.totalAmount.value));
                     return Decimal.div(v, 10).plus(1);
                 },
+                inverseCostPre(x: DecimalSource) {
+                    let v = Decimal.sub(x, 1).mul(10);
+                    v = v.div(Decimal.pow(0.95, paper.books.dyeBook.totalAmount.value));
+                    if (Decimal.gte(v, 10)) v = Decimal.mul(v, 5).root(2);
+                    if (Decimal.gte(v, 25)) v = Decimal.mul(v, 20).root(2);
+                    return Decimal.isNaN(v) ? Decimal.dZero : v.floor().max(0);
+                },
+                inverseCost() {
+                    if (unref(buyable.visibility) != Visibility.Visible) return Decimal.dZero;
+                    return unref(costs).reduce((pre, c) =>
+                        Decimal.min(this.inverseCostPre(Decimal.div(c.res.value, unref(c.base)).root(unref(c.root ?? 1))), pre)
+                    , Decimal.dInf);
+                },
                 canPurchase: computed((cost?: DecimalSource) => {
                     if (unref(buyable.visibility) != Visibility.Visible) return false;
                     const trueCost = cost ?? unref(buyable.cost) ?? Decimal.dInf;
diff --git a/src/data/layers/elves.tsx b/src/data/layers/elves.tsx
index 24c0c5b..d01ddd2 100644
--- a/src/data/layers/elves.tsx
+++ b/src/data/layers/elves.tsx
@@ -38,8 +38,14 @@ import workshop from "./workshop";
 import wrappingPaper from "./wrapping-paper";
 import dyes from "./dyes";
 
+export interface ElfBuyable extends GenericBuyable {
+    /** The inverse function of the cost formula, used to calculate the maximum amount that can be bought by elves. */
+    inverseCost: (x?: DecimalSource) => DecimalSource
+}
+
 const id = "elves";
 const day = 4;
+
 const layer = createLayer(id, function (this: BaseLayer) {
     const name = "Elves";
     const colorBright = "red";
@@ -542,13 +548,12 @@ const layer = createLayer(id, function (this: BaseLayer) {
             name: string;
             description: string;
             buyable:
-                | (GenericBuyable & { resource?: Resource })
-                | (GenericBuyable & { resource?: Resource })[];
+                | (ElfBuyable & { resource?: Resource })
+                | (ElfBuyable & { resource?: Resource })[];
             cooldownModifier: Modifier;
-            customCost?: (amount: DecimalSource) => DecimalSource;
             hasToggle?: boolean;
             toggleDesc?: string;
-            onAutoPurchase?: (buyable: GenericBuyable & { resource?: Resource }) => void;
+            onAutoPurchase?: (buyable: ElfBuyable & { resource?: Resource }, amount: DecimalSource) => void;
             onPurchase?: VoidFunction; // Will get overriden by the custom onpurchase, but that's fine
             canBuy?: Computable<boolean>;
             buyMax?: Computable<boolean>;
@@ -566,27 +571,29 @@ const layer = createLayer(id, function (this: BaseLayer) {
         function update(diff: number) {
             if (upgrade.bought.value && unref(isActive)) {
                 buyProgress.value = Decimal.add(buyProgress.value, diff);
+
                 const cooldown = Decimal.recip(computedAutoBuyCooldown.value);
                 amountOfTimesDone.value += diff / cooldown.toNumber();
+
+                let maxBuyAmount = Decimal.div(buyProgress.value, cooldown).floor();
+                buyProgress.value = Decimal.sub(buyProgress.value, maxBuyAmount.mul(cooldown));
+
+                if (unref(buyMax)) maxBuyAmount = Decimal.dInf;
+
                 (isArray(options.buyable) ? options.buyable : [options.buyable]).forEach(
                     buyable => {
-                        while (buyMax ? true : Decimal.gte(buyProgress.value, cooldown)) {
-                            if (
-                                options.customCost && buyable.resource
-                                    ? Decimal.gte(
-                                          buyable.resource.value,
-                                          options.customCost(buyable.amount.value)
-                                      )
-                                    : unref(buyable.canPurchase)
-                            ) {
-                                buyable.amount.value = Decimal.add(buyable.amount.value, 1);
-                                buyProgress.value = Decimal.sub(buyProgress.value, cooldown);
-                                options.onAutoPurchase?.(buyable);
-                            } else {
-                                buyProgress.value = cooldown;
-                                break;
-                            }
-                        }
+                        const buyAmount = Decimal.min(
+                            Decimal.sub(buyable.inverseCost(buyable.resource?.value), buyable.amount.value), 
+                            maxBuyAmount
+                        );
+
+                        if (buyAmount.lte(0)) return;
+
+                        buyable.amount.value = Decimal.add(buyable.amount.value, buyAmount);
+                        maxBuyAmount = Decimal.sub(maxBuyAmount, buyAmount);
+                        options.onAutoPurchase?.(buyable, buyAmount);
+
+                        if (maxBuyAmount.lte(0)) return;
                     }
                 );
             }
@@ -723,8 +730,8 @@ const layer = createLayer(id, function (this: BaseLayer) {
         visibility: () => showIf(boxes.upgrades.ashUpgrade.bought.value),
         hasToggle: true,
         toggleDesc: "Activate auto-purchased bonfires",
-        onAutoPurchase() {
-            const spent = unref((this.buyable as GenericBuyable).cost!);
+        onAutoPurchase(buyable, amount) {
+            const spent = Decimal.mul(unref(buyable.cost ?? 0), amount);
             coal.activeFires.value = Decimal.sub(coal.activeFires.value, spent).max(0);
             coal.buildFire.amount.value = Decimal.sub(coal.buildFire.amount.value, spent).max(0);
             if (bonfireElf.toggle.value) {
@@ -745,9 +752,9 @@ const layer = createLayer(id, function (this: BaseLayer) {
         visibility: () => showIf(boxes.upgrades.coalUpgrade.bought.value),
         hasToggle: true,
         toggleDesc: "Activate auto-purchased kilns",
-        onAutoPurchase() {
+        onAutoPurchase(_, amount) {
             if (kilnElf.toggle.value) {
-                coal.activeKilns.value = Decimal.add(coal.activeKilns.value, 1);
+                coal.activeKilns.value = Decimal.add(coal.activeKilns.value, amount);
             }
         },
         onPurchase() {
@@ -791,9 +798,9 @@ const layer = createLayer(id, function (this: BaseLayer) {
             showIf(management.elfTraining.expandersElfTraining.milestones[3].earned.value),
         hasToggle: true,
         toggleDesc: "Activate auto-purchased coal drills",
-        onAutoPurchase() {
+        onAutoPurchase(_, amount) {
             if (coalDrillElf.toggle.value) {
-                coal.activeDrills.value = Decimal.add(coal.activeDrills.value, 1);
+                coal.activeDrills.value = Decimal.add(coal.activeDrills.value, amount);
             }
         }
     });
@@ -807,14 +814,14 @@ const layer = createLayer(id, function (this: BaseLayer) {
             showIf(management.elfTraining.fertilizerElfTraining.milestones[4].earned.value),
         hasToggle: true,
         toggleDesc: "Activate auto-purchased oil drills",
-        onAutoPurchase(buyable) {
+        onAutoPurchase(buyable, amount) {
             if (heavyDrillElf.toggle.value) {
                 if (buyable === oil.buildHeavy) {
-                    oil.activeHeavy.value = Decimal.add(oil.activeHeavy.value, 1);
+                    oil.activeHeavy.value = Decimal.add(oil.activeHeavy.value, amount);
                 } else if (buyable === oil.buildHeavy2) {
-                    oil.activeHeavy2.value = Decimal.add(oil.activeHeavy2.value, 1);
+                    oil.activeHeavy2.value = Decimal.add(oil.activeHeavy2.value, amount);
                 } else if (buyable === oil.buildExtractor) {
-                    oil.activeExtractor.value = Decimal.add(oil.activeExtractor.value, 1);
+                    oil.activeExtractor.value = Decimal.add(oil.activeExtractor.value, amount);
                 }
             }
         }
@@ -829,14 +836,14 @@ const layer = createLayer(id, function (this: BaseLayer) {
             showIf(management.elfTraining.heatedCutterElfTraining.milestones[4].earned.value),
         hasToggle: true,
         toggleDesc: "Activate auto-purchased oil-using machines",
-        onAutoPurchase(buyable) {
+        onAutoPurchase(buyable, amount) {
             if (heavyDrillElf.toggle.value) {
                 if (buyable === oil.buildPump) {
-                    oil.activePump.value = Decimal.add(oil.activePump.value, 1);
+                    oil.activePump.value = Decimal.add(oil.activePump.value, amount);
                 } else if (buyable === oil.buildBurner) {
-                    oil.activeBurner.value = Decimal.add(oil.activeBurner.value, 1);
+                    oil.activeBurner.value = Decimal.add(oil.activeBurner.value, amount);
                 } else if (buyable === oil.buildSmelter) {
-                    oil.activeSmelter.value = Decimal.add(oil.activeSmelter.value, 1);
+                    oil.activeSmelter.value = Decimal.add(oil.activeSmelter.value, amount);
                 }
             }
         }
diff --git a/src/data/layers/metal.tsx b/src/data/layers/metal.tsx
index 2fa0d73..a08bf55 100644
--- a/src/data/layers/metal.tsx
+++ b/src/data/layers/metal.tsx
@@ -34,6 +34,7 @@ import dyes from "./dyes";
 import management from "./management";
 import workshop from "./workshop";
 import paper from "./paper";
+import { ElfBuyable } from "./elves";
 
 const id = "metal";
 const day = 7;
@@ -415,6 +416,17 @@ const layer = createLayer(id, function (this: BaseLayer) {
             }
             return cost;
         },
+        inverseCost(x: DecimalSource) {
+            if (management.elfTraining.metalElfTraining.milestones[3].earned.value) {
+                x = Decimal.mul(x, 10);
+            }
+            if (management.elfTraining.clothElfTraining.milestones[4].earned.value) {
+                x = Decimal.mul(x, Decimal.add(oil.depth.value, 1).sqrt());
+            }
+            let v = Decimal.div(x, 10).log(1.15);
+            v = v.div(Decimal.pow(0.95, paper.books.metalBook.totalAmount.value));
+            return Decimal.isNaN(v) ? Decimal.dZero : v.floor().max(0);
+        },
         display: {
             title: "Metal Drill",
             description: "An automated machine to help you mine more ore, faster",
@@ -433,7 +445,7 @@ const layer = createLayer(id, function (this: BaseLayer) {
                         .gte(10)
             ),
         style: { width: "200px" }
-    })) as GenericBuyable & { resource: Resource };
+    })) as ElfBuyable & { resource: Resource };
     const industrialCrucible = createBuyable(() => ({
         resource: noPersist(metal),
         cost() {
@@ -448,6 +460,17 @@ const layer = createLayer(id, function (this: BaseLayer) {
             }
             return cost;
         },
+        inverseCost(x: DecimalSource) {
+            if (management.elfTraining.metalElfTraining.milestones[3].earned.value) {
+                x = Decimal.mul(x, 10);
+            }
+            if (management.elfTraining.clothElfTraining.milestones[4].earned.value) {
+                x = Decimal.mul(x, Decimal.add(oil.depth.value, 1).sqrt());
+            }
+            let v = Decimal.div(x, 10).log(1.15).div(10);
+            v = v.div(Decimal.pow(0.95, paper.books.metalBook.totalAmount.value));
+            return Decimal.isNaN(v) ? Decimal.dZero : v.floor().max(0);
+        },
         display: {
             title: "Industrial Crucible",
             description: "A giant automated crucible furnace, letting you smelt ore faster",
@@ -465,7 +488,7 @@ const layer = createLayer(id, function (this: BaseLayer) {
                     Decimal.gte(bestOre.value, 50)
             ),
         style: { width: "200px" }
-    })) as GenericBuyable & { resource: Resource };
+    })) as ElfBuyable & { resource: Resource };
     const autoSmeltEnabled = persistent<boolean>(true);
     const hotterForge = createBuyable(() => ({
         resource: coal.coal,
@@ -481,6 +504,17 @@ const layer = createLayer(id, function (this: BaseLayer) {
             }
             return cost;
         },
+        inverseCost(x: DecimalSource) {
+            if (management.elfTraining.metalElfTraining.milestones[3].earned.value) {
+                x = Decimal.mul(x, 10);
+            }
+            if (management.elfTraining.clothElfTraining.milestones[4].earned.value) {
+                x = Decimal.mul(x, Decimal.add(oil.depth.value, 1).sqrt());
+            }
+            let v = Decimal.div(x, 1e12).log(10);
+            v = v.div(Decimal.pow(0.95, paper.books.metalBook.totalAmount.value));
+            return Decimal.isNaN(v) ? Decimal.dZero : v.floor().max(0);
+        },
         display: {
             title: "Hotter Forges",
             description:
@@ -495,7 +529,7 @@ const layer = createLayer(id, function (this: BaseLayer) {
         visibility: () =>
             showIf(Decimal.gte(hotterForge.amount.value, 1) || industrialFurnace.bought.value),
         style: { width: "200px" }
-    })) as GenericBuyable & { resource: Resource };
+    })) as ElfBuyable & { resource: Resource };
     const hotterForgeEffect = computed(() => Decimal.times(hotterForge.amount.value, 0.25));
 
     globalBus.on("update", diff => {
diff --git a/src/data/layers/oil.tsx b/src/data/layers/oil.tsx
index e8d4ffc..5b74056 100644
--- a/src/data/layers/oil.tsx
+++ b/src/data/layers/oil.tsx
@@ -39,6 +39,7 @@ import dyes from "./dyes";
 import management from "./management";
 import workshop from "./workshop";
 import { WithRequired } from "util/common";
+import { ElfBuyable } from "./elves";
 
 const id = "oil";
 const day = 9;
@@ -104,6 +105,12 @@ const layer = createLayer(id, function (this: BaseLayer) {
             v = Decimal.pow(0.95, paper.books.heavyDrillBook.totalAmount.value).times(v);
             return Decimal.pow(1.3, v).times(2.5e4);
         },
+        inverseCost(x: DecimalSource) {
+            let v = Decimal.div(x, 2.5e4).log(1.3);
+            v = v.div(Decimal.pow(0.95, paper.books.heavyDrillBook.totalAmount.value));
+            if (Decimal.gte(v, 100)) v = Decimal.mul(v, 100).root(4);
+            return Decimal.isNaN(v) ? Decimal.dZero : v.floor().max(0);
+        },
         display: jsx(() => (
             <>
                 <h3>Heavy Drill</h3>
@@ -134,7 +141,7 @@ const layer = createLayer(id, function (this: BaseLayer) {
             color: colorText,
             width: "160px"
         }
-    })) as GenericBuyable & { resource: Resource };
+    })) as ElfBuyable & { resource: Resource };
     const {
         min: minHeavy,
         max: maxHeavy,
@@ -162,6 +169,12 @@ const layer = createLayer(id, function (this: BaseLayer) {
             v = Decimal.pow(0.95, paper.books.heavyDrillBook.totalAmount.value).times(v);
             return Decimal.pow(2, v).times(1e5);
         },
+        inverseCost(x: DecimalSource) {
+            let v = Decimal.div(x, 1e5).log(2);
+            v = v.div(Decimal.pow(0.95, paper.books.heavyDrillBook.totalAmount.value));
+            if (Decimal.gte(v, 50)) v = Decimal.mul(v, 50).root(4);
+            return Decimal.isNaN(v) ? Decimal.dZero : v.floor().max(0);
+        },
         display: jsx(() => (
             <>
                 <h3>Heavy Drill Drill</h3>
@@ -195,7 +208,7 @@ const layer = createLayer(id, function (this: BaseLayer) {
             color: colorText,
             width: "160px"
         }
-    })) as GenericBuyable & { resource: Resource };
+    })) as ElfBuyable & { resource: Resource };
     const {
         min: minHeavy2,
         max: maxHeavy2,
@@ -218,6 +231,12 @@ const layer = createLayer(id, function (this: BaseLayer) {
             v = Decimal.pow(0.95, paper.books.heavyDrillBook.totalAmount.value).times(v);
             return Decimal.pow(8, v).times(2e5);
         },
+        inverseCost(x: DecimalSource) {
+            let v = Decimal.div(x, 2e5).log(8);
+            v = v.div(Decimal.pow(0.95, paper.books.heavyDrillBook.totalAmount.value));
+            if (Decimal.gte(v, 100)) v = Decimal.mul(v, 100).root(4);
+            return Decimal.isNaN(v) ? Decimal.dZero : v.floor().max(0);
+        },
         display: jsx(() => (
             <>
                 <h3>Heavy Extractor</h3>
@@ -244,7 +263,7 @@ const layer = createLayer(id, function (this: BaseLayer) {
             color: colorText,
             width: "160px"
         }
-    })) as GenericBuyable & { resource: Resource };
+    })) as ElfBuyable & { resource: Resource };
     const {
         min: minExtractor,
         max: maxExtractor,
@@ -288,6 +307,18 @@ const layer = createLayer(id, function (this: BaseLayer) {
             }
             return price;
         },
+        inverseCost(x: DecimalSource) {
+            if (management.elfTraining.heavyDrillElfTraining.milestones[1].earned.value) {
+                x = Decimal.mul(x, 10);
+            }
+            if (row2Upgrades[4].bought.value) {
+                x = Decimal.mul(x, Decimal.add(totalOil.value, 1).root(6));
+            }
+            let v = Decimal.div(x, 2e6).log(16);
+            v = v.div(Decimal.pow(0.95, paper.books.heavyDrillBook.totalAmount.value));
+            if (Decimal.gte(v, 100)) v = Decimal.mul(v, 100).root(4);
+            return Decimal.isNaN(v) ? Decimal.dZero : v.floor().max(0);
+        },
         display: jsx(() => (
             <>
                 <h3>Oil Pump</h3>
@@ -313,7 +344,7 @@ const layer = createLayer(id, function (this: BaseLayer) {
             color: colorText,
             width: "160px"
         }
-    })) as GenericBuyable & { resource: Resource };
+    })) as ElfBuyable & { resource: Resource };
     const {
         max: maxPump,
         min: minPump,
@@ -343,6 +374,12 @@ const layer = createLayer(id, function (this: BaseLayer) {
             v = Decimal.pow(0.95, paper.books.oilBook.totalAmount.value).times(v);
             return Decimal.pow(2, v).times(50);
         },
+        inverseCost(x: DecimalSource) {
+            let v = Decimal.div(x, 50).log(2);
+            v = v.div(Decimal.pow(0.95, paper.books.oilBook.totalAmount.value));
+            if (Decimal.gte(v, 100)) v = Decimal.mul(v, 100).root(4);
+            return Decimal.isNaN(v) ? Decimal.dZero : v.floor().max(0);
+        },
         display: jsx(() => (
             <>
                 <h3>Oil Burner</h3>
@@ -375,7 +412,7 @@ const layer = createLayer(id, function (this: BaseLayer) {
             color: colorText,
             width: "160px"
         }
-    })) as GenericBuyable & { resource: Resource };
+    })) as ElfBuyable & { resource: Resource };
     const {
         max: maxBurner,
         min: minBurner,
@@ -402,6 +439,15 @@ const layer = createLayer(id, function (this: BaseLayer) {
                 price = price.div(Decimal.add(totalOil.value, 1).root(6));
             return price;
         },
+        inverseCost(x: DecimalSource) {
+            if (row2Upgrades[4].bought.value) {
+                x = Decimal.mul(x, Decimal.add(totalOil.value, 1).root(6));
+            }
+            let v = Decimal.div(x, 1e7).log(10);
+            v = v.div(Decimal.pow(0.95, paper.books.oilBook.totalAmount.value));
+            if (Decimal.gte(v, 100)) v = Decimal.mul(v, 100).root(4);
+            return Decimal.isNaN(v) ? Decimal.dZero : v.floor().max(0);
+        },
         display: jsx(() => (
             <>
                 <h3>Oil Smelter</h3>
@@ -426,7 +472,7 @@ const layer = createLayer(id, function (this: BaseLayer) {
             color: colorText,
             width: "160px"
         }
-    })) as GenericBuyable & { resource: Resource };
+    })) as ElfBuyable & { resource: Resource };
 
     const {
         max: maxSmelter,
diff --git a/src/data/layers/paper.tsx b/src/data/layers/paper.tsx
index b6e8ac7..22e1f40 100644
--- a/src/data/layers/paper.tsx
+++ b/src/data/layers/paper.tsx
@@ -23,7 +23,7 @@ import { render, renderCol, renderRow } from "util/vue";
 import { computed, ComputedRef, ref, unref } from "vue";
 import cloth from "./cloth";
 import coal from "./coal";
-import elves from "./elves";
+import elves, { ElfBuyable } from "./elves";
 import plastic from "./plastic";
 import trees from "./trees";
 import dyes from "./dyes";
@@ -131,6 +131,28 @@ const layer = createLayer(id, function (this: BaseLayer) {
                 }
                 return cost;
             },
+            inverseCost(x: DecimalSource) {
+                if (bookUpgrade.bought.value) {
+                    x = Decimal.div(x, 10);
+                }
+                if (management.elfTraining.paperElfTraining.milestones[0].earned.value) {
+                    x = Decimal.div(x, sumBooks.value.max(1));
+                }
+                
+                let scaling = 5;
+                if (management.elfTraining.paperElfTraining.milestones[0].earned.value) {
+                    scaling--;
+                }
+
+                let v = Decimal.div(x, 10).log(scaling);
+
+                v = v.div(Decimal.pow(0.95, paperBook.totalAmount.value));
+                if (Decimal.gte(v, 10000)) v = Decimal.mul(v, 10000).root(2);
+                if (Decimal.gte(v, 100)) v = Decimal.mul(v, 100).root(2);
+                if (options.elfName === "Star" || options.elfName === "Bell") v = Decimal.root(v, 2);
+
+                return Decimal.isNaN(v) ? Decimal.dZero : v.floor().max(0);
+            },
             style: "width: 600px",
             freeLevels: computed(() =>
                 management.elfTraining.paperElfTraining.milestones[4].earned.value
@@ -138,7 +160,7 @@ const layer = createLayer(id, function (this: BaseLayer) {
                     : 0
             ),
             totalAmount: computed(() => Decimal.add(buyable.amount.value, buyable.freeLevels.value))
-        })) as GenericBuyable & {
+        })) as ElfBuyable & {
             resource: Resource;
             freeLevels: ComputedRef<DecimalSource>;
             totalAmount: ComputedRef<DecimalSource>;
diff --git a/src/data/layers/trees.tsx b/src/data/layers/trees.tsx
index 4c932fd..1dab5fb 100644
--- a/src/data/layers/trees.tsx
+++ b/src/data/layers/trees.tsx
@@ -32,7 +32,7 @@ import boxes from "./boxes";
 import cloth from "./cloth";
 import coal from "./coal";
 import dyes from "./dyes";
-import elves from "./elves";
+import elves, { ElfBuyable } from "./elves";
 import management from "./management";
 import paper from "./paper";
 import workshop from "./workshop";
@@ -214,12 +214,21 @@ const layer = createLayer(id, function (this: BaseLayer) {
             v = Decimal.pow(0.95, paper.books.cuttersBook.totalAmount.value).times(v);
             return Decimal.times(100, v).add(200);
         },
+        inverseCost(x: DecimalSource) {
+            let v = Decimal.sub(x, 200).div(100);
+            v = v.div(Decimal.pow(0.95, paper.books.cuttersBook.totalAmount.value));
+            if (Decimal.gte(v, 2e30)) v = Decimal.mul(v, Decimal.pow(2e30, 9999)).root(10000);
+            if (Decimal.gte(v, 2e6)) v = Decimal.mul(v, 2e6).root(2);
+            if (Decimal.gte(v, 200)) v = Decimal.mul(v, 200).root(2);
+            if (Decimal.gte(v, 50)) v = Decimal.mul(v, 50).root(2);
+            return Decimal.isNaN(v) ? Decimal.dZero : v.floor().max(0);
+        },
         display: {
             title: "Generic Cutters",
             description: "Each cutter cuts down 1 tree/s"
         },
         visibility: () => showIf(researchUpgrade2.bought.value)
-    })) as GenericBuyable & { display: { title: string }; resource: Resource };
+    })) as ElfBuyable & { display: { title: string }; resource: Resource };
     const autoPlantingBuyable1 = createBuyable(() => ({
         resource: noPersist(logs),
         cost() {
@@ -235,12 +244,24 @@ const layer = createLayer(id, function (this: BaseLayer) {
             }
             return cost;
         },
+        inverseCost(x: DecimalSource) {
+            if (management.elfTraining.planterElfTraining.milestones[3].earned.value) {
+                x = Decimal.mul(x, 10);
+            }
+            let v = Decimal.sub(x, 200).div(100);
+            v = v.div(Decimal.pow(0.95, paper.books.plantersBook.totalAmount.value));
+            if (Decimal.gte(v, 2e30)) v = Decimal.mul(v, Decimal.pow(2e30, 9999)).root(10000);
+            if (Decimal.gte(v, 2e6)) v = Decimal.mul(v, 2e6).root(2);
+            if (Decimal.gte(v, 200)) v = Decimal.mul(v, 200).root(2);
+            if (Decimal.gte(v, 50)) v = Decimal.mul(v, 50).root(2);
+            return Decimal.isNaN(v) ? Decimal.dZero : v.floor().max(0);
+        },
         display: {
             title: "Generic Planters",
             description: "Each planter plants 0.5 trees/s"
         },
         visibility: () => showIf(researchUpgrade2.bought.value)
-    })) as GenericBuyable & { display: { title: string }; resource: Resource };
+    })) as ElfBuyable & { display: { title: string }; resource: Resource };
     const expandingForestBuyable = createBuyable(() => ({
         resource: noPersist(logs),
         cost() {
@@ -251,12 +272,20 @@ const layer = createLayer(id, function (this: BaseLayer) {
             v = Decimal.pow(0.95, paper.books.expandersBook.totalAmount.value).times(v);
             return Decimal.pow(Decimal.add(v, 1), 1.5).times(500);
         },
+        inverseCost(x: DecimalSource) {
+            let v = Decimal.div(x, 500).root(1.5).sub(1);
+            v = v.div(Decimal.pow(0.95, paper.books.expandersBook.totalAmount.value));
+            if (Decimal.gte(v, 1e15)) v = Decimal.mul(v, 1e135).root(10);
+            if (Decimal.gte(v, 1e5)) v = Decimal.mul(v, 1e5).root(2);
+            if (Decimal.gte(v, 100)) v = Decimal.mul(v, 100).root(2);
+            return Decimal.isNaN(v) ? Decimal.dZero : v.floor().max(0);
+        },
         display: {
             title: "Expand Forest",
             description: "Add 10 trees to the forest"
         },
         visibility: () => showIf(researchUpgrade2.bought.value)
-    })) as GenericBuyable & { display: { title: string }; resource: Resource };
+    })) as ElfBuyable & { display: { title: string }; resource: Resource };
     const row1Buyables = [autoCuttingBuyable1, autoPlantingBuyable1, expandingForestBuyable];
 
     const manualCuttingAmount = createSequentialModifier(() => [