"""Structural checks of production HTML; not a browser layout/visual test."""
from html.parser import HTMLParser


class Document(HTMLParser):
    def __init__(self, html):
        super().__init__(convert_charrefs=True)
        self.root = {'tag': 'root', 'attrs': {}, 'children': [], 'text': ''}
        self.stack = [self.root]
        self.ids = {}
        self.feed(html)
        assert self.stack == [self.root]

    def handle_starttag(self, tag, attrs):
        node = {'tag': tag, 'attrs': dict(attrs), 'children': [], 'text': '', 'parent': self.stack[-1]}
        self.stack[-1]['children'].append(node)
        if 'id' in node['attrs']:
            ident = node['attrs']['id']
            assert ident not in self.ids, ident
            self.ids[ident] = node
        if tag not in {'meta', 'link', 'img', 'input', 'br', 'hr'}:
            self.stack.append(node)

    def handle_endtag(self, tag):
        assert self.stack[-1]['tag'] == tag, (tag, self.stack[-1]['tag'])
        self.stack.pop()

    def handle_data(self, data):
        for node in self.stack:
            node['text'] += data


def check_layout(html):
    doc = Document(html)
    ids = doc.ids
    def classes(node):
        return node['attrs'].get('class', '').split()
    def descendants(node):
        for child in node['children']:
            yield child
            yield from descendants(child)
    def ancestor(node, cls):
        while 'parent' in node:
            node = node['parent']
            if cls in classes(node):
                return node
        raise AssertionError(cls)
    for domain in ('serial', 'network', 'broker', 'writer'):
        trigger = ids['quick-' + domain]
        assert trigger['tag'] == 'button' and trigger['attrs']['type'] == 'button'
        assert trigger['attrs']['aria-controls'] == 'serial-settings'
        assert trigger['attrs']['aria-expanded'] == 'false'
        assert trigger['attrs']['aria-haspopup'] == 'dialog'
        assert trigger['attrs']['aria-label'] and 'disabled' in trigger['attrs']
    assert ids['quick-full']['tag'] == 'a' and ids['quick-full']['attrs']['href'] == '#serial-settings'
    assert 'hidden' in ids['quick-header']['attrs']
    assert ids['network-password']['parent'] is ids['network-password-label']
    assert ids['network-password-mode']['parent'] is ids['network-password-mode-label']
    for ident in ('settings-values', 'accounts-list', 'account-keys-list', 'network-summary', 'display-values', 'broker-values', 'ssh-values'):
        assert ids[ident]['tag'] == 'dl'
        assert 'settings-values' in classes(ids[ident])
    for ident in ('serial-settings-content', 'account-settings', 'network-settings', 'display-settings', 'broker-settings', 'ssh-settings', 'lifecycle-settings'):
        nodes = list(descendants(ids[ident]))
        assert not any(n['tag'] == 'pre' for n in nodes)
        assert all('connection-detail' in classes(n) for n in nodes if n['tag'] == 'p')
        for n in nodes:
            if n['tag'] in ('input', 'select', 'textarea'):
                assert n['parent']['tag'] == 'label'
                try:
                    ancestor(n, 'settings-edit')
                except AssertionError:
                    ancestor(n, 'serial-edit')
    for ident in ('refresh-settings', 'refresh-accounts', 'network-refresh', 'display-refresh', 'broker-refresh', 'ssh-refresh', 'lifecycle-refresh'):
        assert ids[ident]['text'] == 'Refresh'
    for ident in ('serial-result', 'account-result', 'network-result', 'display-result', 'broker-result', 'ssh-result', 'lifecycle-result'):
        assert ids[ident]['text'] == 'Check Operation Result'
    for ident in ('network-boot', 'network-enabled', 'account-password-saved'):
        assert 'settings-check' in classes(ids[ident]['parent'])
    for ident in ('account-public-key', 'account-generated'):
        assert 'settings-wide' in classes(ids[ident]['parent'])
    assert 'readonly' in ids['account-generated']['attrs']
    assert 'hidden' in ids['account-generated-panel']['attrs']
    assert ids['network-apply']['parent'] is ids['network-wifi-save']['parent']
    assert ids['network-wifi-save']['parent'] is ids['network-wifi-load']['parent']
    assert ids['network-start']['parent'] is not ids['network-wifi-save']['parent']
    assert ids['network-start']['parent'] is ids['network-next-profile']['parent']
    assert html.index('id="account-delete"') < html.index('id="account-result"') < html.index('id="account-key-add"') < html.index('id="account-submit-password"')
    css = next(n['text'] for n in descendants(doc.root) if n['tag'] == 'style')
    for rule in (
        '.settings-values dd{margin:0;white-space:pre-wrap;overflow-wrap:anywhere}',
        '.settings-values{display:grid;grid-template-columns:minmax(110px,1fr) minmax(0,2fr);gap:8px 16px;max-width:600px}',
        '.serial-edit,.settings-edit{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:12px;max-width:600px}',
        '.settings-edit .settings-wide{grid-column:1/-1}',
        '.settings-edit input[type=checkbox]{width:auto;flex:none}',
        '.settings-edit textarea{min-height:96px;resize:vertical}',
        '.settings-edit input[readonly]{font-family:monospace}',
        '.settings-page h3{font-size:1.17em;margin:1em 0}',
        '.settings-page .connection-detail{max-width:600px;overflow-wrap:anywhere}',
        '@media(max-width:360px)',
        '.settings-edit{grid-template-columns:minmax(0,1fr)}',
    ):
        assert rule in css, rule
    assert '.settings-edit textarea{font:inherit;width:100%;min-width:0;' in css
    print('PASS HTML layout: parsed structure, shared styles, labels, wrapping, checkbox sizing and action order across all seven settings views')


def check_browser_layout(html, tmp, executable):
    """Optional real CSS layout check; fixture data, no application/network execution."""
    import json
    import re
    import subprocess
    # Keep production HTML/CSS, but do not run its authenticated loader or assets.
    fixture = re.sub(r'<script\b[^>]*>.*?</script>', '', html, flags=re.S)
    fixture = re.sub(r'<link\b[^>]*>|<img\b[^>]*>', '', fixture)
    probe = r'''
    const cases = [];
    for (const width of [320, 600, 1200]) for (const view of ['serial-settings-content', 'account-settings', 'network-settings', 'display-settings']) for (const quick of [false, true]) {
        if (quick && !['serial-settings-content', 'network-settings'].includes(view)) continue;
        const height = quick ? 360 : 900;
        const frame = document.createElement('iframe'); frame.style.width = width + 'px'; frame.style.height = height + 'px';
        cases.push(new Promise(resolve => {
            frame.onload = () => {
                const d = frame.contentDocument, win = frame.contentWindow;
                d.getElementById('serial-settings').hidden = false;
                for (const id of ['serial-settings-content', 'account-settings', 'network-settings', 'display-settings']) d.getElementById(id).hidden = id !== view;
                const section = d.getElementById(view);
                section.querySelectorAll('[hidden]').forEach(n => n.hidden = false);
                section.querySelectorAll('dl').forEach(dl => {
                    dl.textContent = '';
                    for (let i = 0; i < 8; i++) {
                        const dt = d.createElement('dt'), dd = d.createElement('dd');
                        dt.textContent = 'Password configured'; dd.textContent = 'SHA256:' + 'x'.repeat(96);
                        dl.append(dt, dd);
                    }
                });
                section.querySelectorAll('input:not([type=checkbox]),textarea').forEach(n => n.value = 'x'.repeat(96));
                const errors = [];
                if (quick) {
                    const host = d.getElementById('serial-settings'); host.dataset.quick = 'true';
                    d.getElementById('quick-header').hidden = false;
                    const rect = host.getBoundingClientRect();
                    if (rect.left < 0 || rect.top < 0 || rect.right > width || rect.bottom > height) errors.push('popover viewport overflow');
                    if (host.scrollWidth > host.clientWidth + 1) errors.push('popover horizontal overflow');
                    if (win.getComputedStyle(host).overflowY !== 'auto') errors.push('popover not scrollable');
                    for (const id of ['settings-navigation', 'network-password-mode-label', 'network-password-label', 'network-password-status']) {
                        if (d.getElementById(id).getBoundingClientRect().width) errors.push('quick hidden content:' + id);
                    }
                }
                for (const node of section.querySelectorAll('dl,input,select,textarea,.settings-edit,.serial-edit,.serial-actions')) {
                    const rect = node.getBoundingClientRect();
                    if (!rect.width) continue;
                    if (rect.left < 0 || rect.right > width + 1) errors.push('overflow:' + (node.id || node.className));
                    if (node.matches('dl') && node.scrollWidth > node.clientWidth + 1) errors.push('summary overflow');
                    if (node.matches('input[type=checkbox]') && rect.width > 30) errors.push('checkbox width');
                    if (node.matches('dl,.settings-edit,.serial-edit') && rect.width > 601) errors.push('max width');
                }
                // Measure glyph ranges, not the full-width grid cell or textContent.
                // The normal-whitespace control proves the pair detects collapsing.
                for (const dd of quick ? [] : section.querySelectorAll('dl dd:first-of-type')) {
                    const original = dd.textContent;
                    const measureSSID = spaces => {
                        dd.textContent = 'SSID: ' + JSON.stringify('office' + ' '.repeat(spaces) + 'wifi');
                        const range = d.createRange();
                        range.setStart(dd.firstChild, 7); range.setEnd(dd.firstChild, dd.textContent.length - 1);
                        if (range.getClientRects().length !== 1) errors.push('SSID probe unexpectedly wrapped');
                        return range.getBoundingClientRect().width;
                    };
                    const single = measureSSID(1), double = measureSSID(2);
                    if (!(single > 0 && double > single + 1)) errors.push('consecutive SSID spaces collapsed');
                    dd.style.whiteSpace = 'normal';
                    if (Math.abs(measureSSID(2) - measureSSID(1)) > 0.1) errors.push('invalid whitespace control');
                    dd.style.removeProperty('white-space'); dd.textContent = original;
                }
                resolve({width, height, view, quick, errors});
            };
        }));
        frame.srcdoc = FIXTURE; document.body.append(frame);
    }
    Promise.all(cases).then(results => {
        const out = document.createElement('pre'); out.id = 'layout-results'; out.textContent = JSON.stringify(results); document.body.append(out);
    });
    '''.replace('FIXTURE', json.dumps(fixture))
    page = tmp / 'layout-probe.html'
    page.write_text('<!doctype html><html><body><script>' + probe + '</script></body></html>')
    result = subprocess.run([executable, '--headless', '--no-sandbox', '--disable-gpu',
                             '--no-first-run', '--disable-background-networking',
                             '--user-data-dir=' + str(tmp / 'chromium-profile'),
                             '--virtual-time-budget=3000', '--dump-dom', page.as_uri()],
                            capture_output=True, text=True, timeout=30)
    assert result.returncode == 0, result.stderr
    parsed = Document(result.stdout)
    results = json.loads(parsed.ids['layout-results']['text'])
    assert len(results) == 18
    assert all(not case['errors'] for case in results), results
    print('PASS Chromium layout: four full views plus Serial/Wi-Fi popovers at 320/600/1200px (quick height360); viewport/overflow/secret exclusion and full-page whitespace checks (fixtures, not live app)')