import EventEmitter from '../events.js';
import HookEvent from '../hook.js';

class EventSourceApi extends EventEmitter {
    constructor(ctx) {
        super();
        this.ctx = ctx;
        this.window = ctx.window;
        this.EventSource = this.window.EventSource || {};
        this.esProto = this.EventSource.prototype || {};
        this.url = ctx.nativeMethods.getOwnPropertyDescriptor(
            this.esProto,
            'url'
        );
        this.CONNECTING = 0;
        this.OPEN = 1;
        this.CLOSED = 2;
    }
    overrideConstruct() {
        this.ctx.override(
            this.window,
            'EventSource',
            (target, that, args) => {
                if (!args.length) return new target(...args);
                let [url, config = {}] = args;

                const event = new HookEvent({ url, config }, target, that);
                this.emit('construct', event);

                if (event.intercepted) return event.returnValue;
                return new event.target(event.data.url, event.data.config);
            },
            true
        );

        if ('EventSource' in this.window) {
            this.window.EventSource.CONNECTING = this.CONNECTING;
            this.window.EventSource.OPEN = this.OPEN;
            this.window.EventSource.CLOSED = this.CLOSED;
        }
    }
    overrideUrl() {
        this.ctx.overrideDescriptor(this.esProto, 'url', {
            get: (target, that) => {
                const event = new HookEvent(
                    { value: target.call(that) },
                    target,
                    that
                );
                this.emit('url', event);
                return event.data.value;
            },
        });
    }
}

export default EventSourceApi;