06. Company

class Company{
    constructor() {
        this.departments = {};
    }

    addEmployee(name, salary, position, department) {
        if ([...arguments].some(a => a === null || a === undefined || a === '') || salary < 0) {
            throw new Error('Invalid input!');
        }

        if (!this.departments.hasOwnProperty(department)) {
            this.departments[department] = [];
        }

        let person = [name, salary, position]
        this.departments[department].push(person);

        return `New employee is hired. Name: ${name}. Position: ${position}`;
    }

    bestDepartment() {
        let highestAvgSalary = 0;
        let bestDep = '';
        for (const department in this.departments) {
            let totalWorkers = this.departments[department].length;
            let totalSalaries = 0;
            this.departments[department].forEach(worker => {
                let salary = worker[1];
                totalSalaries += salary;
            })
            let currentAverage = totalSalaries / totalWorkers;

            if (currentAverage > highestAvgSalary) {
                highestAvgSalary = currentAverage;
                bestDep = department;
            }
        }

        let sortedBest = this.departments[bestDep].sort((a, b) => {
            if (a[1] === b[1]) {
                return a[0].localeCompare(b[0]);
            }
                return b[1] - a[1];
        })

        let result = '';
        result += `Best Department is: ${bestDep}`;
        result += `\nAverage salary: ${highestAvgSalary.toFixed(2)}`;

        sortedBest.forEach(worker => {
            result += `\n${worker[0]} ${worker[1]} ${worker[2]}`;
        })

        return result;
    }
}