(function installDestinationSelector() {
  'use strict';

  let options = [];
  let requiredBytes = 0;

  const esc = value => String(value == null ? '' : value).replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, '&quot;').replace(/'/g, '&#39;');
  const bytes = value => value == null ? 'unknown' : value >= 1024 ** 3 ? `${(value / 1024 ** 3).toFixed(1)} GB` : value >= 1024 ** 2 ? `${(value / 1024 ** 2).toFixed(1)} MB` : `${Math.max(0, value)} B`;
  const age = value => value == null ? 'unknown age' : value < 60_000 ? 'just now' : value < 3_600_000 ? `${Math.ceil(value / 60_000)} min old` : `${Math.ceil(value / 3_600_000)} h old`;
  const reason = code => ({
    'offline-volume': 'offline',
    'install-capability-disabled': 'install disabled by adapter',
    'missing-mountpoint': 'mountpoint unavailable',
    'capacity-unknown': 'capacity unknown',
    'insufficient-capacity': 'not enough free space',
    'stale-capacity-telemetry': 'capacity telemetry stale',
    'stale-capability-telemetry': 'capability telemetry stale',
    'compatibility-incompatible': 'blocked by applicable compatibility evidence',
  }[code] || code);

  function selected() {
    const select = document.getElementById('install-destination-volume');
    return options.find(item => item.volumeId === select?.value) || null;
  }

  function expertOpen() {
    return document.getElementById('install-expert-destination')?.open === true;
  }

  function renderStatus() {
    const status = document.getElementById('install-destination-status');
    const option = selected();
    if (!status) return;
    if (option) {
      status.className = `install-destination-status ${option.eligible ? 'is-eligible' : 'is-ineligible'}`;
      status.innerHTML = `<strong>${esc(option.eligible ? 'Eligible destination' : 'Destination unavailable')}</strong><span>Required ${esc(bytes(requiredBytes))} · free ${esc(bytes(option.freeBytes))} · projected ${esc(bytes(option.projectedFreeBytes))} · evidence ${esc(age(option.capacityAgeMs))}${option.reasons.length ? ` · ${esc(option.reasons.map(reason).join(', '))}` : ''}</span>`;
      const raw = document.getElementById('install-ftp-path');
      if (option.compatibility) status.insertAdjacentHTML('beforeend', window.chimeraCompatibilityGuidance?.markup?.(option.compatibility) || '');
      if (raw && option.suggestedRemotePath) raw.value = option.suggestedRemotePath;
    } else {
      status.className = 'install-destination-status is-ineligible';
      status.innerHTML = '<strong>No eligible semantic destination</strong><span>Refresh console storage evidence or use the Expert raw-path override.</span>';
    }
    if (typeof updateInstallConfirmState === 'function') updateInstallConfirmState('pfs');
  }

  async function load({ titleId, required = 0, legacyPath = '' } = {}) {
    requiredBytes = Math.max(0, Number(required) || 0);
    const packet = await window.pork.installDestinations({ titleId, requiredBytes });
    options = Array.isArray(packet?.destinations) ? packet.destinations : [];
    const select = document.getElementById('install-destination-volume');
    const raw = document.getElementById('install-ftp-path');
    if (raw) raw.value = legacyPath || '';
    if (!select) return packet;
    select.innerHTML = '<option value="">Select a destination volume</option>' + options.map(option => {
      const suffix = option.eligible ? `${bytes(option.freeBytes)} free` : option.reasons.map(reason).join(', ');
      return `<option value="${esc(option.volumeId)}"${option.eligible ? '' : ' disabled'}>${esc(option.deviceName)} · ${esc(option.volumeKey)} · ${esc(suffix)}</option>`;
    }).join('');
    const preferred = options.find(option => option.eligible);
    select.value = preferred?.volumeId || '';
    renderStatus();
    return packet;
  }

  function selection() {
    const option = selected();
    if (option?.eligible) return { destinationVolumeId: option.volumeId, remotePath: option.suggestedRemotePath, expertRawPath: false };
    const raw = document.getElementById('install-ftp-path')?.value?.trim() || '';
    return expertOpen() && raw ? { destinationVolumeId: null, remotePath: raw, expertRawPath: true } : null;
  }

  document.getElementById('install-destination-volume')?.addEventListener('change', renderStatus);
  document.getElementById('install-expert-destination')?.addEventListener('toggle', renderStatus);
  document.getElementById('install-ftp-path')?.addEventListener('input', renderStatus);

  window.chimeraInstallDestination = Object.freeze({ load, selection, isReady: () => Boolean(selection()) });
})();