import { expect } from 'chai';
import {
    addEventListenersToPuppeteerPage, EventName, loadCachedTestBed,
    takeScreenshot, TestBed
} from '../../../puppeteer-tests/util';
import { ElementHandle } from 'puppeteer';
import { positiveDigest, negativeDigest, untriagedDigest } from '../cluster-page-sk/test_data';
import path from "path";

describe('cluster-digests-sk', () => {
    let testBed: TestBed;
    before(async () => {
        testBed = await loadCachedTestBed(
            path.join(__dirname, '..', '..', 'webpack.config.ts')
        );
    });
    let promiseFactory: <T>(eventName: EventName) => Promise<T>;
    let clusterDigestsSk: ElementHandle;

    beforeEach(async () => {
        promiseFactory = await addEventListenersToPuppeteerPage(testBed.page,
            ['layout-complete', 'selection-changed']);
        const loaded = promiseFactory('layout-complete'); // Emitted when layout stabilizes.
        await testBed.page.goto(`${testBed.baseUrl}/dist/cluster-digests-sk.html`);
        await loaded;
        clusterDigestsSk = (await testBed.page.$('#cluster svg'))!;
    });

    it('should render the demo page', async () => {
        // Smoke test.
        expect(await testBed.page.$$('cluster-digests-sk')).to.have.length(1);
    });

    it('should take a screenshot', async () => {
        await takeScreenshot(clusterDigestsSk, 'gold', 'cluster-digests-sk');
    });

    it('supports single digest selection via clicking', async () => {
        await clickNodeAndExpectSelectionChangedEvent(positiveDigest, [positiveDigest]);

        await takeScreenshot(clusterDigestsSk, 'gold', 'cluster-digests-sk_one-positive-selected');

        await clickNodeAndExpectSelectionChangedEvent(untriagedDigest, [untriagedDigest]);

        await takeScreenshot(clusterDigestsSk, 'gold',
            'cluster-digests-sk_one-untriaged-selected');
    });

    it('supports multiple digest selection via shift clicking', async () => {
        await clickNodeAndExpectSelectionChangedEvent(negativeDigest, [negativeDigest]);

        await shiftClickNodeAndExpectSelectionChangedEvent(positiveDigest,
            [negativeDigest, positiveDigest]);

        await takeScreenshot(clusterDigestsSk, 'gold', 'cluster-digests-sk_two-digests-selected');

        await shiftClickNodeAndExpectSelectionChangedEvent(untriagedDigest,
            [negativeDigest, positiveDigest, untriagedDigest]);

        await takeScreenshot(clusterDigestsSk, 'gold',
            'cluster-digests-sk_three-digests-selected');
    });

    it('clears selection by clicking anywhere on the svg that is not on a node', async () => {
        await clickNodeAndExpectSelectionChangedEvent(negativeDigest, [negativeDigest]);

        const clickEvent = promiseFactory<Array<string>>('selection-changed');
        await clusterDigestsSk.click();
        const evt = await clickEvent;
        expect(evt).to.deep.equal([]);
    });

    async function clickNodeAndExpectSelectionChangedEvent(digest: string, expectedSelection: string[]) {
        const clickEvent = promiseFactory<Array<string>>('selection-changed');
        await clickNodeWithDigest(testBed, digest);
        const evt = await clickEvent;
        expect(evt).to.deep.equal(expectedSelection);
    }

    async function shiftClickNodeAndExpectSelectionChangedEvent(digest: string, expectedSelection: string[]) {
        const clickEvent = promiseFactory<Array<string>>('selection-changed');
        await shiftClickNodeWithDigest(testBed, digest);
        const evt = await clickEvent;
        expect(evt).to.deep.equal(expectedSelection);
    }
});

export async function clickNodeWithDigest(testBed: TestBed, digest: string) {
    await testBed.page.click(`circle.node[data-digest="${digest}"]`);
}

export async function shiftClickNodeWithDigest(testBed: TestBed, digest: string) {
    await testBed.page.keyboard.down('Shift');
    await clickNodeWithDigest(testBed, digest);
    await testBed.page.keyboard.up('Shift');
}