02. Hall - JS Exam- 12 Aug 2020

function solveClasses() {
    class Hall {
        constructor(capacity, name) {
            this.capacity = capacity;
            this.name = name;
            this.events = [];
        }

        hallEvent(title) {
            if (this.events.includes(title)) {
                throw new Error("This event is already added!");
            }

            this.events.push(title);
            return "Event is added.";
        }

        close() {
            this.events = [];
            return `${this.name} hall is closed.`
        }

        toString() {
            const result = [`${this.name} hall - ${this.capacity}`];

            if (this.events.length > 0) {
                result.push(`Events: ${this.events.join(', ')}`);
            }

            return result.join('\n');
        }
    }

    class MovieTheater extends Hall {
        constructor(capacity, name, screenSize) {
            super(capacity, name);
            this.events = [];

            this.screenSize = screenSize;
        }

        close() {
            return super.close() + "Аll screenings are over.";
        }

        toString() {
            const result = [super.toString()];

            result.push(`${this.name} is a movie theater with ${this.screenSize} screensize and ${this.capacity} seats capacity.`);

            return result.join('\n');
        }
    }

    class ConcertHall extends Hall {
        constructor(capacity, name) {
            super(capacity, name);
            this.events = [];
            this.performers = []
        }

        hallEvent(title, performers) {
            if (this.events.includes(title)) {
                throw new Error("This event is already added!");
            }

            this.events.push(title);
            this.performers.push(...performers);

            return "Event is added.";
        }

        close() {
            this.performers = [];
            return super.close() + "Аll performances are over.";
        }

        toString() {
            const result = [super.toString()];

            if (this.performers.length > 0) {
                result.push(`Performers: ${this.performers.join(', ')}.`);
            }

            return result.join('\n');
        }
    }

    return {
        Hall,
        MovieTheater,
        ConcertHall
    }
}