init webseite ts and claude

webseite-ts-claude/backend/model/ProductModel.js

@@ -0,0 +1,113 @@
+import fs from 'node:fs';
+import { v4 as id } from 'uuid';
+
+// Factoryfunction
+const ProductModel = () => {
+  let products = [];
+
+  const load = () => {
+    try {
+      products = JSON.parse(fs.readFileSync('./data/products.json', 'utf-8'));
+    } catch (error) {
+      console.log('Something went wrong: ', error);
+      products = [];
+    }
+  };
+
+  const reset = () => {
+    try {
+      products = JSON.parse(fs.readFileSync('./data/products.bakup.json', 'utf-8'));
+    } catch (error) {
+      console.log('Something went wrong: ', error);
+      products = [];
+    }
+  };
+
+  const save = () => {
+    try {
+      fs.writeFileSync('./data/products.json', JSON.stringify(products, null, 2), 'utf-8');
+    } catch (error) {
+      console.log('Something went wrong:', error);
+    }
+  };
+
+  const getAll = () => {
+    return products;
+  };
+
+  const get = (id) => {
+    const product = products.find((product) => {
+      return product._id === id;
+    });
+
+    // Guard
+    if (!product) return null;
+
+    return product;
+  };
+
+  const add = (product) => {
+    const { name, price } = product;
+
+    if (!hasAllProps(product)) return false;
+
+    products.push({
+      _id: id(),
+      name,
+      price: Number(price.toFixed(2)),
+      position: products.length + 1,
+    });
+
+    return true;
+  };
+
+  const update = (product) => {
+    const foundIdx = products.findIndex((obj) => {
+      return obj._id === product._id;
+    });
+
+    // Guard
+    if (foundIdx === -1 || !hasAllProps(product)) return false;
+
+    products[foundIdx] = product;
+    return true;
+  };
+
+  const remove = (id) => {
+    const foundIdx = products.findIndex((obj) => {
+      return obj._id === id;
+    });
+
+    // Guard
+    if (foundIdx === -1) return false;
+
+    products.splice(foundIdx, 1);
+
+    return true;
+  };
+
+  /**
+   * hasAllProps - Überprüfung ob Product "name" und "price"
+   * @return boolean
+   **/
+  const hasAllProps = (product) => {
+    // return Object.hasOwn(product, 'name') && Object.hasOwn(product, 'price');
+
+    const keys = Object.keys(product); // => ['name', 'price']
+    return keys.includes('name') && keys.includes('price');
+  };
+
+  return {
+    // load: load
+    load,
+    save,
+    add,
+    getAll,
+    get,
+    update,
+    delete: remove,
+    reset,
+  };
+};
+
+export default ProductModel;