Some logic for products

src/modules/product.js

@@ -10,6 +10,10 @@ class Product {
     this.icon = icon;
   }
 
+  equals(other) {
+    return this.name === other.name
+  }
+
   static get REGISTRY() {
     return {
       empty: new Product('', ''),

src/modules/products.js

@@ -1,5 +1,6 @@
 class Products {
-    
+  static instance
+
   constructor(canvas) {
     const { random, floor } = Math
 
@@ -26,6 +27,8 @@ class Products {
     this.ctx = canvas.getContext('2d');
     this.setCanvasSize(canvas);
     this.update();
+
+    Products.instance = this
   }
 
   setCanvasSize (canvas) {
@@ -59,10 +62,6 @@ class Products {
     return number;
   }
 
-  getJobRequest() {
-
-  }
-
   product(x, y, v, productsKey, productsValue) {
     let fontSize = 40;
     this.ctx.font = `900 ${fontSize}px "Font Awesome 5 Free"`;
@@ -95,10 +94,36 @@ class Products {
     }
   }
 
+  /**
+   * 
+   * @param {(product: Product, amount: number, i: number, j: number, end: () => bool) => bool} filter 
+   * @returns 
+   */
+  filter(filter) {
+    const list = []
+    for (let i = 0; i < 20; ++i) {
+      for (let j = 0; j < 9; ++j) {
+        let mustEnd = false
+        let end = (val = false) => (mustEnd = true, val)
+        const product = this.gridProducts[i][j]
+        const amount = this.gridProductsAmount[i][j]
+
+        if (typeof(product) !== 'string' 
+        && filter(product, amount, i, j, end)) {
+          list.push({ product, amount: Number(amount), x: i, y: j })
+        }
+
+        if (mustEnd)
+          return list
+      }
+    }
+    return list
+  }
+
   /**
    * @param {Product} incomingProduct 
    * @param {number} incomingAmount 
-   * @returns {{product: Product; amount: number} | } Old shelf content
+   * @returns {{product: Product; amount: number} | null } Old shelf content
    */
   exchange(x, y, incomingProduct, incomingAmount) {
     const product = this.gridProducts[x][y]
@@ -107,4 +132,28 @@ class Products {
     this.gridProductsAmount[x][y] = incomingAmount
     return { product, amount }
   }
+
+  /**
+   * @param {Product} incomingProduct
+   * @param {number} incomingAmount
+   * @returns {{product: Product; amount: number} | null } Old shelf content or leftover
+   */
+  interact(x, y, incomingProduct, incomingAmount) {
+    const { max, min } = Math
+    const amount = this.gridProductsAmount[x][y]
+    if (this.gridProducts[x][y].equals(incomingProduct) && amount < 50) {
+      this.gridProductsAmount[x][y] = min(incomingAmount, 50)
+      return { product: incomingProduct, amount: max(0, (amount + incomingAmount) - 50) }
+    }
+    return this.exchange(x, y, incomingProduct, incomingAmount)
+  }
+
+  getJobRequest() {
+    const maybeProduct = this.filter((_product, amount, _i, _j, end) => amount < 50 && end(true))
+    return maybeProduct.length === 0 ? null : maybeProduct[0]
+  }
+
+  findAvailableLocationsFor(product) {
+    return this.filter((p, amount) => product.equals(p) && amount < 50)
+  }
 }