02. Employees

function solveClasses() {
  class Developer {
    constructor(firstName, lastName) {
      this.firstName = firstName;
      this.lastName = lastName;
      this.baseSalary = 1000;
      this.tasks = [];
      this.experience = 0;
    }
    addTask(id, taskName, priority) {
      let task = { id, taskName, priority };
      if (priority == "high") {
        this.tasks.unshift(task);
      } else {
        this.tasks.push(task);
      }

      return `Task id ${id}, with ${priority} priority, has been added.`;
    }
    doTask() {
      if (this.tasks.length == 0) {
        return `${this.firstName}, you have finished all your tasks. You can rest now.`;
      } else {
        let removed = this.tasks.shift();
        return removed.taskName;
      }
    }
    getSalary() {
      return `${this.firstName} ${this.lastName} has a salary of: ${this.baseSalary}`;
    }
    reviewTasks() {
      let taskMessage = "Tasks, that need to be completed:";
      this.tasks.forEach((task) => {
        taskMessage += "\n" + `${task.id}: ${task.taskName} - ${task.priority}`;
      });
      return taskMessage;
    }
  }
  class Junior extends Developer {
    constructor(firstName, lastName, bonus, experience) {
      super(firstName, lastName);
      this.baseSalary = 1000 + bonus;
      this.experience = experience;
    }
    learn(years) {
      this.experience += years;
    }
  }
  class Senior extends Developer {
    constructor(firstName, lastName, bonus, experience) {
      super(firstName, lastName);
      this.baseSalary = 1000 + bonus;
      this.experience = experience + 5;
    }
    changeTaskPriority(taskId) {

        let currentTask = this.tasks.find(i=>i.id==taskId);
        let currentTaskIndex = this.tasks.findIndex(i=>i.id==taskId);
        this.tasks.splice(currentTaskIndex,1);
        if(currentTask.priority=='high'){
            currentTask.priority='low';
            this.tasks.push(currentTask);
        }else{
            currentTask.priority='high';
            this.tasks.unshift(currentTask);
        }
    }
  }
  return {
    Developer,
    Junior,
    Senior,
  };
}