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import {Loc,Event} from 'main.core';
import Stream from './stream';
import Package from './package';
import {EventEmitter} from 'main.core.events';
export default class Streams extends EventEmitter
{
static maxInstances = 3;
static #instance = new Map();
static #packages = new Map();
static #hiddenTag = Symbol('streams descriptor');
static addPackage(pack: Package)
{
console.log('3. Add to a stream queue.');
if (this.maxInstances > 0 && this.#instance.size > this.maxInstances)
{
this.#packages.set(pack);
}
else
{
this.#packages.delete(pack);
this.#runPackage(pack);
}
if (!window[this.#hiddenTag])
{
window[this.#hiddenTag] = this.#catchWindow.bind(this);
Event.bind(window, 'beforeunload', window[this.#hiddenTag]);
}
}
static #catchWindow(event)
{
if (this.#packages.size > 0 || this.#instance.size > 0)
{
const confirmationMessage = Loc.getMessage('UPLOADER_UPLOADING_ONBEFOREUNLOAD');
(event || window.event).returnValue = confirmationMessage;
return confirmationMessage;
}
}
static #runPackage(pack: Package)
{
const stream = new Stream();
this.#instance.set(stream);
console.log('3.1. Run package in a stream.');
pack.subscribeOnce('done', () => {
console.log('6. Package is done so release the stream.');
this.#instance.delete(stream);
stream.destroy();
if (this.#packages.size > 0)
{
const [newPack] = this.#packages.entries().next().value;
this.addPackage(newPack);
}
else if (this.#instance.size <= 0)
{
Event.unbind(window, 'beforeunload', window[this.#hiddenTag]);
delete window[this.#hiddenTag];
}
});
pack.run(stream);
}
}