northwind-rest-api/backend/business-logic/employees-logic.js

Local REST API Exposing 'Northwind Traders' Database.

const dal = require("../data-access-layer/dal");
const imageHelper = require("../helpers/image-helper");

async function getAllEmployees() {
    const employees = await dal.getAllEmployees();
    return employees;
};

async function getOneEmployee(id) {
    const employees = await dal.getAllEmployees();
    const employee = employees.find(e => e.id === id);
    return employee;
};

async function addEmployee(employee, image) {
    const employees = await dal.getAllEmployees();
    const maxId = employees.reduce((maxId, e) => e.id > maxId ? e.id : maxId, 0);
    employee.id = maxId + 1;
    const fileName = await imageHelper.saveEmployeeImage(image);
    employee.imageUrl = fileName ? "http://localhost:3030/api/employees/images/" + fileName : null;
    employees.push(employee);
    await dal.saveAllEmployees(employees);
    return employee;
};

async function updateEmployee(newEmployee, image) {
    const employees = await dal.getAllEmployees();
    const existingEmployee = employees.find(e => e.id === newEmployee.id);
    if (!existingEmployee) return null;
    for (const prop in newEmployee) {
        if (newEmployee[prop] !== undefined) {
            existingEmployee[prop] = newEmployee[prop];
        }
    }
    const currentFileName = existingEmployee.imageUrl ? existingEmployee.imageUrl.substring(existingEmployee.imageUrl.lastIndexOf("/") + 1) : null;
    const newFileName = await imageHelper.updateEmployeeImage(currentFileName, image);
    if(newFileName) {
        existingEmployee.imageUrl = "http://localhost:3030/api/employees/images/" + newFileName;
    }
    await dal.saveAllEmployees(employees);
    return existingEmployee;
};

async function deleteEmployee(id) {
    const employees = await dal.getAllEmployees();
    const index = employees.findIndex(e => e.id === id);
    if (index === -1) return;
    const existingEmployee = employees[index];
    const currentFileName = existingEmployee.imageUrl ? existingEmployee.imageUrl.substring(existingEmployee.imageUrl.lastIndexOf("/") + 1) : null;
    await imageHelper.deleteEmployeeImage(currentFileName)
    employees.splice(index, 1);
    await dal.saveAllEmployees(employees);
};

module.exports = {
    getAllEmployees,
    getOneEmployee,
    addEmployee,
    updateEmployee,
    deleteEmployee
};