import {EventHandler, EventsManager} from "../src/events-manager";
import {EventsMatcher} from "../test-kit/drivers/events-matcher";
import {DirectoryCreatedEvent, FileDeletedEvent, fileSystemEventNames} from "../src/universal";
import {delayedPromise} from "../src/promise-utils";
import * as sinon from 'sinon';
import {expect} from "chai";

describe('EventsManager', () => {
    let matcher: EventsMatcher;
    let em: EventsManager;

    const event1 = {type: 'fileDeleted', fullPath: 'foo'} as FileDeletedEvent;
    const event2 = {type: 'fileDeleted', fullPath: 'bar'} as FileDeletedEvent;
    const event3 = {type: 'directoryCreated', fullPath: 'baz'} as DirectoryCreatedEvent;
    const handler = {
        types: ['fileDeleted'],
        filter: (e) => e === event1,
        apply: () => (event3 as any),
    } as EventHandler<'fileDeleted'>;

    beforeEach('setup', () => {
        em = new EventsManager();
        matcher = new EventsMatcher({retries: 15, interval: 2, timeout: 40, noExtraEventsGrace: 10});
        matcher.track(em.events, ...fileSystemEventNames);
    });

    describe('delays', async () => {
        const delay = 50;
        let delayedManager: EventsManager;
        let delayedManagerMatcher: EventsMatcher;
        beforeEach('setup', () => {
            em = new EventsManager();
            delayedManager = new EventsManager({delay});
            delayedManagerMatcher = new EventsMatcher({
                retries: 15,
                interval: 2,
                timeout: 40,
                noExtraEventsGrace: 10
            });
            delayedManagerMatcher.track(delayedManager.events, ...fileSystemEventNames);
        });

        it('events', async () => {
            delayedManager.emit(event1); // this will change
            await delayedManagerMatcher.expect([]);
            await delayedPromise(delay * 2);
            await delayedManagerMatcher.expect([event1]);
        });

        it('handlers', async () => {
            const spy = sinon.spy();
            delayedManager.addEventHandler({
                types: ['fileDeleted'],
                filter: spy,
                apply: () => {
                },
            });
            delayedManager.emit(event1); // this will change
            await expect(spy).to.have.callCount(0);
            await delayedPromise(delay * 2);
            await expect(spy).to.have.callCount(1);
        });
    });

    it('emits events', async () => {
        em.emit(event1);
        await matcher.expect([event1]);
    });


    it('modifies matching events', async () => {
        em.addEventHandler(handler);
        em.emit(event1); // this will change
        em.emit(event2); // this does not match handler
        await matcher.expect([event3, event2]);
    });

    it('filters matching events', async () => {
        em.addEventHandler({
            types: ['fileDeleted'],
            filter: (e) => e === event1,
            apply: () => {
            }, // don't return an event
        });
        em.emit(event1); // this will be filtered
        em.emit(event2); // this does not match handler
        await matcher.expect([event2]);
    });

    it('respects time out (assume clean-up)', async () => {
        em.addEventHandler(handler, 1);
        await delayedPromise(10);
        em.emit(event1);
        await matcher.expect([event1]);
    });


    it('removes handlers', async () => {
        em.addEventHandler(handler);
        em.removeEventHandler(handler);
        em.emit(event1);
        await matcher.expect([event1]);
    });
});