/*
 * Sideways scroll check for phones. Not part of the gate, run by hand on the local stack (see README, "Overflow check").
 * A Playwright function, run with the Playwright MCP tool browser_run_code_unsafe (filename = this file) or
 * `playwright-cli run-code`. Log in as an admin in that browser first. A logged-in browser redirects the logged-out
 * pages, so check those in a second run with LOGGED_OUT = true in a clean browser (no session).
 * A hit is: scrollWidth != clientWidth, an element sticking out on the left (never raises scrollWidth), or a
 * redirect away from the page.
 * Content clipped inside an overflow-hidden ancestor is not checked (same rule as scrollWidth).
 */
async (page) => {
    const BASE = 'http://localhost:5173';
    const WIDTHS = [360, 390, 412, 414];
    const FONT_PERCENT = 100; // set 130 for the large system font run
    const DARK = false; // set true for dark mode
    const SKIN = ''; // e.g. 'pastel' to check a skin
    const LOGGED_OUT = false; // true: only the logged-out pages, run in a browser without a session
    const GAME_ID = 620; // any appid in the library
    const PROFILE_NAME = 'Dev'; // display name of the logged-in user, the profile must be public
    const PAGES = LOGGED_OUT ? ['/', '/login', '/register', '/reset-password', '/impressum', `/u/${encodeURIComponent(PROFILE_NAME)}`] : [
        '/dashboard', '/library', `/library/${GAME_ID}`, '/wishlist', '/play-next', '/stats', '/import', '/points',
        '/settings', '/whats-new', '/welcome', '/audit/games', '/audit/links', '/audit/log', '/admin/users',
        '/admin/hints', '/admin/news', '/admin/broadcasts', `/u/${encodeURIComponent(PROFILE_NAME)}`,
    ];

    const hits = [];
    let checked = 0;
    for (const width of WIDTHS) {
        await page.setViewportSize({width, height: 800});
        for (const path of PAGES) {
            await page.goto(BASE + path); // no networkidle: some pages poll
            await page.waitForTimeout(1500);
            if (FONT_PERCENT !== 100) await page.addStyleTag({content: `html{font-size:${FONT_PERCENT}%}`});
            await page.evaluate(([dark, skin]) => {
                document.documentElement.classList.toggle('dark', dark);
                if (skin) document.documentElement.dataset.skin = skin;
            }, [DARK, SKIN]);
            await page.waitForTimeout(300);
            const result = await page.evaluate(() => {
                const root = document.documentElement;
                const describe = (element) => `${element.tagName.toLowerCase()}.${String(element.className).slice(0, 60)}`;
                const all = [...document.querySelectorAll('body *')].map((element) => [element, element.getBoundingClientRect()]);
                const right = all.filter(([, box]) => box.right > root.clientWidth).sort((a, b) => b[1].right - a[1].right);
                // Clipped by an overflow:hidden/auto ancestor (an effect preview, a scroller): not visible, not a hit.
                const clipped = (element) => {
                    for (let parent = element.parentElement; parent && parent !== document.body; parent = parent.parentElement) {
                        if (getComputedStyle(parent).overflowX !== 'visible') return true;
                    }
                    return false;
                };
                const left = all.filter(([element, box]) => box.width > 0 && box.left < 0 && !clipped(element));
                if (root.scrollWidth === root.clientWidth && left.length === 0) return null;
                return {
                    scrollWidth: root.scrollWidth, clientWidth: root.clientWidth,
                    widest: right.slice(0, 5).map(([element]) => describe(element)),
                    offLeft: left.slice(0, 5).map(([element]) => describe(element)),
                };
            });
            checked++;
            const landed = await page.evaluate(() => location.pathname);
            if (decodeURIComponent(landed) !== decodeURIComponent(path)) hits.push({path, width, redirectedTo: landed});
            if (result) hits.push({path, width, ...result});
        }
    }
    return {checked, hits};
}