init material grabber

Construct [BP]/scripts/classes/Builder/Builder.js

@@ -1,6 +1,9 @@
 import { BuilderOptions } from "./BuilderOptions";
 
 export class Builder {
+    playerId;
+    materialInstanceName;
+
     constructor(playerId) {
         this.playerId = playerId;
     }

Construct [BP]/scripts/classes/Instance/StructureInstance.js

@@ -5,12 +5,14 @@ import { Structure } from "../Structure/Structure";
 import { InstanceOptions } from "./InstanceOptions";
 import { TicksPerSecond } from "@minecraft/server";
 import { InstanceNotPlacedError } from "../Errors/InstanceNotPlacedError";
+import { StructureMaterials } from "../Materials/StructureMaterials";
 
 export class StructureInstance {
     options;
     structure = void 0;
     verifier = void 0;
     outliner = void 0;
+    materials = void 0;
 
     constructor(instanceName, structureId) {
         this.structure = new Structure(structureId);
@@ -28,6 +30,9 @@ export class StructureInstance {
     }
 
     refreshBox() {
+        if (!this.materials)
+            this.materials = new StructureMaterials(this);
+        this.materials.refresh();
         if (!this.hasLocation())
             return;
         if (!this.outliner)
@@ -134,6 +139,10 @@ export class StructureInstance {
             return this.structure.getAllLocations();
     }
 
+    getActiveMaterials() {
+        return this.materials;
+    }
+
     isEnabled() {
         return this.options.isEnabled;
     }

Construct [BP]/scripts/classes/Materials/MaterialsForm.js

@@ -0,0 +1,37 @@
+import { MaterialsFormBuilder } from './MaterialsFormBuilder';
+import { forceShow } from '../../utils';
+import { Builders } from '../Builder/Builders';
+
+export class MaterialsForm {
+    constructor(player) {
+        this.player = player;
+        this.show();
+    }
+
+    show() {
+        try {
+            return forceShow(this.player, MaterialsFormBuilder.buildInstanceSelector()).then((response) => {
+                if (response.canceled)
+                    return;
+                let selection = response.selection;
+                const selectedInstanceName = structureCollection.getInstanceNames()[selection];
+                if (selectedInstanceName) {
+                    this.setActiveInstance(selectedInstanceName);
+                    this.player.sendMessage(`§8Selected instance for material grabber: §2${selectedInstanceName}`);
+                    return;
+                }
+            });
+        } catch (e) {
+            if (e.message === 'Menu timed out.') {
+                this.player.sendMessage('§8Menu timed out.');
+                return;
+            }
+            throw e;
+        }
+    }
+
+    setActiveInstance(instanceName) {
+        const builder = Builders.get(this.player.id);
+        builder.materialInstanceName = instanceName;
+    }
+}

Construct [BP]/scripts/classes/Materials/MaterialsFormBuilder.js

@@ -0,0 +1,15 @@
+import { MenuFormBuilder } from "../MenuFormBuilder";
+
+export class InstanceFormBuilder {
+    menuTitle = MenuFormBuilder.menuTitle + ' Material Grabber';
+
+    static buildInstanceSelector() {
+        const allInstanceNameForm = new ActionFormData()
+            .title(this.menuTitle)
+            .body('Select an instance:');
+        structureCollection.getInstanceNames().forEach(instanceName => {
+            allInstanceNameForm.button(`§2${instanceName}`);
+        });
+        return allInstanceNameForm;
+    }
+}

Construct [BP]/scripts/classes/Materials/StructureMaterials.js

@@ -1,5 +1,5 @@
-class MaterialCounter {
+class StructureMaterials {
-    instance
+    instance;
     materials;
 
     constructor(instance) {
@@ -7,6 +7,11 @@ class MaterialCounter {
         this.materials = {};
     }
 
+    refresh() {
+        this.clear();
+        this.populateActive();
+    }
+
     populateAll() {
         for (const layer = 0; layer < this.instance.getMaxLayer(); layer++)
             this.getLayer(layer)
@@ -32,47 +37,33 @@ class MaterialCounter {
     }
 
     clear() {
-        this.materials = {}; // does this leak memory??
+        for (const key in this.materials)
+            delete this.materials[key];
     }
 
     toString() {
-        const materials = {};
-        for (const block of this.instance.getAllBlocks()) {
-            const itemStack = block?.getItemStack();
-            const typeId = itemStack?.typeId.replace('minecraft:', '');
-            if (!typeId) continue;
-            if (!materials[typeId]) {
-                materials[typeId] = { count: 0, maxStack: itemStack.maxAmount };
-            }
-            materials[typeId].count++;
-        }
         let message = [];
-        for (const blockType in materials) {
+        for (const blockType in this.materials) {
-            let count = materials[blockType].count;
+            let count = this.materials[blockType].count;
             let countStr = '';
-            const maxStack = materials[blockType].maxStack;
+            const stackSize = this.materials[blockType].stackSize;
-            const fullShulker = 27 * maxStack;
+            const fullShulker = 27 * stackSize;
-            if (count >= fullShulker) {
+            if (count >= fullShulker)
                 countStr = `${Math.floor(count / fullShulker)} sb`;
-            }
+            if (count > fullShulker)
-            if (count > fullShulker) {
                 countStr += ' + ';
-            }
             count %= fullShulker;
-            if (count >= maxStack) {
+            if (count >= stackSize)
-                countStr += `${Math.floor(count / maxStack)} stack`;
+                countStr += `${Math.floor(count / stackSize)} stack`;
-            }
+            if (count > stackSize)
-            if (count > maxStack) {
                 countStr += ' + ';
-            }
+            count %= stackSize;
-            count %= maxStack;
+            if (count > 0)
-            if (count > 0) {
                 countStr += count;
-            }
             message.push(`  ${blockType}: ${countStr}`);
         }
         return message.sort().join('\n');
     }
 }
 
-export { MaterialCounter };
+export { StructureMaterials };

Construct [BP]/scripts/options/materialGrabber.js

@@ -1,5 +1,8 @@
 import { BuilderOption } from '../classes/Builder/BuilderOption';
-import { world } from '@minecraft/server';
+import { EntityComponentTypes, ItemStack, Player, world, system } from '@minecraft/server';
+import { MaterialsForm } from '../classes/Materials/MaterialsForm';
+import { Builders } from '../classes/Builder/Builders';
+import { structureCollection } from '../classes/Structure/StructureCollection';
 
 const builderOption = new BuilderOption({
     identifier: 'materialGrabber',
@@ -8,12 +11,123 @@ const builderOption = new BuilderOption({
     howToUse: "Interact with inventories using a paper named 'Material Grabber' to pull structure items from them.",
 });
 
+world.beforeEvents.itemUse.subscribe(onItemUse);
 world.beforeEvents.playerInteractWithBlock.subscribe(onPlayerInteract);
 world.beforeEvents.playerInteractWithEntity.subscribe(onPlayerInteract);
 
+function onItemUse(event) {
+    if (!isActionItem(event.itemStack) || !builderOption.isEnabled(event.source.id))
+        return;
+    event.cancel = true;
+    new MaterialsForm(event.source);
+}
+
 function onPlayerInteract(event) {
-    // get inventory
+    if (!isActionItem(event.itemStack) || !builderOption.isEnabled(event.player.id))
-    // analyze active structure items if not analyzed -- there needs to be a way to refresh this that is efficient
+        return;
-    // find items in inventory that match items in structure
+    const player = event.player;
-        // transfer to player
+    const target = event.block || event.target;
+    if (target instanceof Player)
+        return;
+    const materials = getActiveMaterials(player);
+    const targetContainer = target.getComponent(EntityComponentTypes.Inventory)?.container;
+    const playerContainer = player.getComponent(EntityComponentTypes.Inventory)?.container;
+    if (!targetContainer || !playerContainer)
+        return;
+    event.cancel = true;
+    system.run(() => {
+        transferMaterialsToPlayer(targetContainer, playerContainer, materials);
+    });
+}
+
+function isActionItem(itemStack) {
+    return itemStack?.typeId === 'minecraft:paper' && itemStack?.nameTag === 'Material Grabber';
+}
+
+function getActiveMaterials(player) {
+    const focusedInstanceName = Builders.get(player.id).materialInstanceName;
+    const structure = structureCollection.get(focusedInstanceName);
+    if (!structure)
+        return [];
+    return structure.getActiveMaterials();
+}
+
+function transferMaterialsToPlayer(targetContainer, playerContainer, materials) {
+    for (let slotIndex = 0; slotIndex < targetContainer.size; slotIndex++) {
+        const slot = targetContainer.getSlot(slotIndex);
+        tryTransferToPlayer(slot, playerContainer, materials);
+    }
+}
+
+function tryTransferToPlayer(slot, playerContainer, materials) {
+    if (slot.hasItem() && materials[slot.typeId]) {
+        const grabAmount = Math.min(slot.amount, materials[slot.typeId].count);
+        if (grabAmount > 0)
+            tryTransferAmountToPlayer(slot, playerContainer, materials, grabAmount);
+    }
+}
+
+function tryTransferAmountToPlayer(slot, playerContainer, materials, grabAmount) {
+    const itemStack = slot.getItem();
+    if (canAddItem(playerContainer, itemStack)) {
+        addItem(playerContainer, itemStack);
+        materials[slot.typeId].count -= grabAmount;
+        removeAmount(slot, grabAmount);
+    }
+}
+
+function removeAmount(slot, amount) {
+    if (amount === slot.amount) {
+        slot.setItem(void 0);
+    } else {
+        slot.amount -= amount;
+        slot.setItem(slot.getItem());
+    }
+}
+
+function canAddItem(inventory, itemStack) {
+    if (inventory.emptySlotsCount !== 0) return true;
+    for (let i = 0; i < inventory.size; i++) {
+        const slot = inventory.getSlot(i);
+        if (itemFitsInPartiallyFilledSlot(slot, itemStack)) return true;
+    }
+    return false;
+}
+
+function itemFitsInPartiallyFilledSlot(slot, itemStack) {
+    return slot.hasItem() && slot.isStackableWith(itemStack) && slot.amount + itemStack.amount <= slot.maxAmount;
+}
+
+function addItem(inventory, itemStack) {
+    const isItemDeposited = partiallyFilledSlotPass(inventory, itemStack);
+    if (!isItemDeposited) 
+        emptySlotPass(inventory, itemStack);
+    
+}
+
+function partiallyFilledSlotPass(inventory, itemStack) {
+    for (let slotNum = 0; slotNum < inventory.size; slotNum++) {
+        const slot = inventory.getSlot(slotNum);
+        if (isSlotAvailableForStacking(slot, itemStack)) {
+            const remainderAmount = Math.max(0, (slot.amount + itemStack.amount) - slot.maxAmount);
+            slot.amount += itemStack.amount - remainderAmount;
+            if (remainderAmount > 0) {
+                const remainderStack = new ItemStack(itemStack.typeId, remainderAmount);
+                addItem(inventory, remainderStack);
+            }
+            return true;
+        }
+    }
+    return false;
+}
+
+function emptySlotPass(inventory, itemStack) {
+    for (let slotNum = 0; slotNum < inventory.size; slotNum++) {
+        const slot = inventory.getSlot(slotNum);
+        if (!slot.hasItem()) {
+            slot.setItem(itemStack);
+            return true;
+        }
+    }
+    return false;
 }