import assert from 'node:assert/strict';
import process from 'node:process';

const playwright = await import(process.env.PLAYWRIGHT_MODULE ?? 'playwright');
const { chromium } = playwright.default ?? playwright;
const browser = await chromium.launch({ channel: 'chrome', headless: true });
const base = 'http://127.0.0.1:4192';
const context = await browser.newContext();
const page = await context.newPage();
page.setDefaultTimeout(10000);
const errors = [];
page.on('pageerror', (error) => errors.push(error.message));

const focusWithTab = async (link) => {
    await page.locator('body').focus();
    for (let step = 0; step < 12; step++) {
        await page.keyboard.press('Tab');
        if (
            await link.evaluate((element) => element === document.activeElement)
        ) {
            assert.equal(
                await link.evaluate((element) =>
                    element.matches(':focus-visible'),
                ),
                true,
            );
            return;
        }
    }
    assert.fail('Primary welcome action was not reachable by keyboard');
};

try {
    for (const width of [1440, 390, 320]) {
        await page.setViewportSize({ width, height: 1000 });
        for (const theme of ['light', 'dark']) {
            await page.emulateMedia({
                colorScheme: theme,
                reducedMotion: 'reduce',
            });
            for (const [path, action] of [
                ['/', 'Sign in to KanbanGit'],
                ['/?auth=1', 'Open dashboard'],
            ]) {
                await page.goto(base + path);
                await page
                    .getByRole('heading', {
                        name: 'Plan the work. Keep Git context close.',
                        exact: true,
                        level: 1,
                    })
                    .waitFor();
                await page.evaluate(() => document.fonts.ready);
                assert.equal(
                    await page
                        .locator('html')
                        .evaluate((element) =>
                            element.classList.contains('dark'),
                        ),
                    theme === 'dark',
                );
                assert.equal(
                    await page.evaluate(
                        () =>
                            document.documentElement.scrollWidth <=
                            window.innerWidth,
                    ),
                    true,
                    `${path} overflows at ${width}px in ${theme} mode`,
                );
                const clippedElements = await page
                    .locator(
                        'header a, main h1, main p, main section, main article, main li, footer p',
                    )
                    .evaluateAll((elements) =>
                        elements
                            .filter((element) => {
                                const bounds = element.getBoundingClientRect();
                                return (
                                    bounds.width > 0 &&
                                    (bounds.left < -0.5 ||
                                        bounds.right > window.innerWidth + 0.5)
                                );
                            })
                            .map((element) => element.outerHTML.slice(0, 120)),
                    );
                assert.deepEqual(
                    clippedElements,
                    [],
                    `${path} clips content at ${width}px in ${theme} mode`,
                );
                assert.equal(await page.locator('main h1').count(), 1);
                const primaryAction = page
                    .locator('main')
                    .getByRole('link', { name: action, exact: true });
                assert.ok(
                    (await primaryAction.evaluate(
                        (element) => element.getBoundingClientRect().height,
                    )) >= 44,
                );
                await page.screenshot({
                    path: `/private/tmp/kan50-welcome-${path.includes('auth') ? 'authenticated' : 'guest'}-${width}-${theme}.png`,
                    fullPage: true,
                });
            }
        }
    }

    await page.setViewportSize({ width: 390, height: 1000 });
    await page.goto(`${base}/`);
    const signIn = page
        .locator('main')
        .getByRole('link', { name: 'Sign in to KanbanGit', exact: true });
    await focusWithTab(signIn);
    await page.keyboard.press('Enter');
    await page.waitForURL('**/login');
    await page
        .getByRole('heading', { name: 'Destination reached', exact: true })
        .waitFor();

    await page.goto(`${base}/?auth=1`);
    const dashboard = page
        .locator('main')
        .getByRole('link', { name: 'Open dashboard', exact: true });
    await focusWithTab(dashboard);
    await page.keyboard.press('Enter');
    await page.waitForURL('**/dashboard');
    await page
        .getByRole('heading', { name: 'Destination reached', exact: true })
        .waitFor();

    assert.deepEqual(errors, []);
    console.log(
        'Welcome browser checks passed: keyboard, guest and authenticated actions, 320/390/1440px and both themes.',
    );
} finally {
    await browser.close();
}