03. People

function solve() {
    class Employee {
        constructor(name, age) {
            if (new.target === Employee) {
                throw new Error("Canot instantiate directly.")
            }
            this.name = name;
            this.age = age;
            this.salary = 0;
            this.tasks = [];
        }

        work() {
            let currentTask = this.tasks.shift();
            console.log(this.name + currentTask);
            this.tasks.push(currentTask);
        }

        collectSalary() {
            console.log(`${this.name} received ${this.salary} this month.`)
        }
    }

    class Junior extends Employee{
        constructor(name, age) {
            super(name, age);
            this.tasks.push(` is working on a simple task.`);
        }
    }

    class Senior extends Employee{
        constructor(name, age) {
            super(name, age);
            this.tasks.push(` is working on a complicated task.`);
            this.tasks.push(` is taking time off work.`);
            this.tasks.push(` is supervising junior workers.`);
        }
    }

    class Manager extends Employee{
        constructor(name, age) {
            super(name, age);
            this.dividend = 0;
            this.tasks.push(` scheduled a meeting.`);
            this.tasks.push(` is preparing a quarterly report.`);
        }

        collectSalary() {
            console.log(`${this.name} received ${this.salary + this.dividend} this month.`)
        }
    }

    return {
        Employee,
        Junior,
        Senior,
        Manager
    }
}