#!/usr/bin/env python3
"""System Load RAM meter updates using the actual combined panel JavaScript.

This is a simulated authenticated DOM/status test, not a Rust runtime integration test.
"""
from pathlib import Path
from panel_html import render_admin_index
import json
import re
from playwright.sync_api import sync_playwright

ROOT = Path(__file__).resolve().parents[2]
router = (ROOT / 'src/admin/router.rs').read_text()

def bundle_for(section):
    match = re.search(r'fn ' + section + r'\([^)]*\)[^{]*\{', router)
    assert match, section
    text = router[match.end():]
    text = text[:re.search(r'\]\s*\.join\("\\n"\)', text).start()]
    result = []
    for line in text.splitlines():
        line = line.strip()
        if 'include_str!("' in line:
            path = re.search(r'include_str!\("([^"]+)"\)', line).group(1)
            result.append((ROOT / 'src/admin' / path).read_text())
        elif line == 'admin_vhosts_javascript(),':
            result.append('(() => {\n' + ''.join((ROOT / 'src/admin/web/vhosts' / f'{part}.js').read_text() + '\n'
                for part in ['core', 'protocol', 'health', 'rates', 'editor', 'render']) + '})();')
        elif line.startswith('"') and line.endswith('",'):
            result.append(json.loads(line[:-1]))
    return '\n'.join(result)

html = render_admin_index(ROOT)
css = (ROOT / 'src/admin/web/style.css').read_text()
js = bundle_for('admin_app_javascript')
with sync_playwright() as playwright:
    browser = playwright.chromium.launch(headless=True, executable_path='/usr/bin/chromium', args=['--no-sandbox'])
    for width in (375, 1440):
        page = browser.new_page(viewport={'width': width, 'height': 900})
        errors = []
        page.on('pageerror', lambda error: errors.append(str(error)))
        page.set_content(html.replace('/assets/app___RUSTPROXY_ASSET_ID__.js', '').replace('/assets/style___RUSTPROXY_ASSET_ID__.css', ''))
        page.add_style_tag(content=css)
        page.add_script_tag(content=js)
        page.wait_for_timeout(100)
        report = page.evaluate('''() => {
          currentPanel = "overview";
          document.getElementById('workspace').hidden = false;
          document.getElementById('panel-overview').hidden = false;
          const meter = document.getElementById('memory-meter');
          const fill = document.getElementById('memory-meter-fill');
          const snapshot = (used, total) => ({system: {source:'measured',cpu_percent:2.1,
              memory_used_bytes:used, memory_total_bytes:total},
              live_system:{cpu_percent:2.1}, cache:{}, metrics:{}, listeners:{}});
          const values = [];
          for (const [used, total] of [[250,1000],[800,1000],[0,1000],[null,null]]) {
            renderDiagnostics(snapshot(used,total), false, true);
            values.push({fill:fill.style.width, now:meter.getAttribute('aria-valuenow'),
                hidden:meter.hidden, text:meter.getAttribute('aria-valuetext')});
          }
          return { values, role:meter.getAttribute('role'), cssHeight:getComputedStyle(meter).height,
            scrollbar:document.documentElement.scrollWidth>window.innerWidth+2 };
        }''')
        assert report['role'] == 'progressbar' and report['cssHeight'] == '5px', report
        assert report['values'][0]['fill'] == '25%' and report['values'][0]['now'] == '25', report
        assert report['values'][1]['fill'] == '80%' and report['values'][1]['now'] == '80', report
        assert report['values'][2]['fill'] == '0%' and report['values'][2]['now'] == '0', report
        assert report['values'][3]['fill'] == '0%' and report['values'][3]['now'] is None and report['values'][3]['hidden'], report
        assert not report['scrollbar'] and not errors, (width, errors, report)
        page.close()
    browser.close()
print('PASS: System RAM meter live percentage and unknown/zero handling on 375/1440px in bundled panel.')