/**
 * HTML templates for the admin area.
 *
 * Deliberately plain. Every action is a form submission that redirects back,
 * so a JavaScript-off session works — the only script we ship is a tiny
 * convenience to copy the sign-this string on the login page.
 *
 * Pages follow the same {title, description, body, here?} shape as the public
 * pages, so the shared layout wraps them unchanged. The admin topnav sits
 * inside each body (so the public topnav still appears above it for continuity).
 */

import { escapeHtml } from './layout.js';
import { CATEGORIES } from './pages-browse.js';
import { MODES } from './modes.js';
import { adminPublisher } from './admin-session.js';

/* ------------------------------- login ------------------------------- */

export function loginPage({ challenge, error = null, name }) {
  const message = `PROMETHEUS-ADMIN-LOGIN\nname=${name}\nchallenge=${challenge}`;
  return {
    title: 'Admin — sign in',
    description: 'Sign in to the Prometheus admin.',
    here: '',
    body: `
<header class="hero compact">
  <h1>Admin</h1>
  <p class="tag">Sign in with the key that owns <code class="inline">${escapeHtml(name)}</code>.</p>
</header>

<div class="wrap narrow">

${error ? `<div class="note danger"><b>Sign-in failed.</b> ${escapeHtml(error)}</div>` : ''}

<section class="plain">
  <ol class="steps">
    <li><b>1. Copy the challenge below into your wallet's "sign message" box.</b>
        <span>The entire block, exactly as shown.</span></li>
    <li><b>2. Sign with the key for the address that owns the admin name.</b>
        <span>Theseus's Aegis panel, Electron Cash, Deviant — any BIP-137
        wallet works.</span></li>
    <li><b>3. Paste the signature below and submit.</b>
        <span>The signature authenticates you as the admin for the next 24 hours.</span></li>
  </ol>

  <h3 style="margin-top:1.6rem">Message to sign</h3>
  <pre id="msg">${escapeHtml(message)}</pre>
  <button class="btn ghost" type="button" onclick="copy()">Copy message</button>

  <form method="post" action="/admin/login" style="margin-top:1.6rem;display:grid;gap:12px">
    <input type="hidden" name="challenge" value="${escapeHtml(challenge)}">
    <label style="color:var(--mut);font-size:14px">
      Signature (base64)
      <textarea name="signature" required rows="3"
        style="width:100%;margin-top:.3rem;padding:10px;background:var(--panel);border:1px solid var(--line);border-radius:10px;color:var(--ink);font-family:ui-monospace,monospace;font-size:13px"></textarea>
    </label>
    <button class="btn acid" type="submit">Sign in</button>
  </form>
</section>

<script>
function copy() {
  const t = document.getElementById('msg').textContent;
  navigator.clipboard.writeText(t).then(
    () => { const b = event.target; const old = b.textContent; b.textContent = 'copied'; setTimeout(() => b.textContent = old, 1200); },
    () => alert('copy failed — select the message and ctrl+c')
  );
}
</script>

</div>`,
  };
}

/* ------------------------------- shared topnav ------------------------------- */

function adminNav(session, here = '') {
  const link = (href, label) =>
    `<a href="${href}" style="${here === href ? 'color:var(--acid);background:rgba(214,255,61,.08);' : ''}padding:6px 12px;border-radius:8px;text-decoration:none;color:var(--mut);font-size:13.5px">${label}</a>`;
  return `<nav style="padding:12px 1.2rem;background:var(--panel);border-bottom:1px solid var(--line);display:flex;gap:4px;align-items:center;flex-wrap:wrap">
    <b style="color:var(--ink);margin-right:14px;font-size:14px">Admin</b>
    ${link('/admin', 'Dashboard')}
    ${link('/admin/listings', 'Listings')}
    ${link('/admin/modes', 'Modes')}
    ${link('/admin/audit', 'Audit')}
    <span style="flex:1"></span>
    <span style="color:var(--dim);font-size:12.5px">${escapeHtml(session.name)}</span>
    <form method="post" action="/admin/logout" style="margin:0">
      <button class="btn ghost" type="submit" style="padding:5px 10px;font-size:12.5px">Sign out</button>
    </form>
  </nav>`;
}

/* ------------------------------- dashboard ------------------------------- */

export function dashboardPage({ session, counts, total, modes, recentListings, recentAudit }) {
  const modeChip = (m) => `<span class="pill p-${m === 'append' ? 'live' : m === 'scan-first' ? 'alpha' : 'designed'}">${escapeHtml(m)}</span>`;

  return {
    title: 'Admin — dashboard',
    description: 'Prometheus admin dashboard.',
    here: '/admin',
    body: `
${adminNav(session, '/admin')}

<div class="wrap">

<section class="plain">
  <h2>Dashboard</h2>

  <div class="grid" style="margin-top:1rem">
    <div class="card">
      <h3>${total}</h3>
      <p>active listings across ${Object.values(counts).filter((n) => n > 0).length} categories</p>
    </div>
    <div class="card">
      <h3>${modeChip(modes.global)}</h3>
      <p>global publish mode</p>
    </div>
    <div class="card">
      <h3>${Object.values(modes.categories).filter(Boolean).length}</h3>
      <p>per-category overrides in effect</p>
    </div>
  </div>
</section>

<section>
  <h2>Recent listings</h2>
  ${recentListings.length === 0
    ? `<p class="lede">No listings yet.</p>`
    : `<table>
         <thead><tr><th>id</th><th>category</th><th>size</th><th>at</th><th></th></tr></thead>
         <tbody>
         ${recentListings.map((r) => `<tr>
           <td><code class="inline">${escapeHtml(r.id)}</code></td>
           <td>${escapeHtml(r.category)}</td>
           <td>${formatBytes(r.download_size)}</td>
           <td style="color:var(--dim);font-size:12.5px">${escapeHtml(r.created_at)}</td>
           <td><a href="/admin/listings#${escapeHtml(r.id)}" style="font-size:12.5px">manage →</a></td>
         </tr>`).join('')}
         </tbody>
       </table>`}
</section>

<section>
  <h2>Recent audit</h2>
  ${recentAudit.length === 0
    ? `<p class="lede">No admin actions yet.</p>`
    : `<table>
         <thead><tr><th>at</th><th>actor</th><th>action</th><th>target</th></tr></thead>
         <tbody>
         ${recentAudit.slice(0, 10).map((r) => `<tr>
           <td style="color:var(--dim);font-size:12.5px">${escapeHtml(r.at)}</td>
           <td>${escapeHtml(r.actor)}</td>
           <td>${escapeHtml(r.action)}</td>
           <td style="color:var(--mut)">${escapeHtml(r.target || '')}</td>
         </tr>`).join('')}
         </tbody>
       </table>
       <p style="margin-top:.8rem"><a href="/admin/audit">Full audit log →</a></p>`}
</section>

</div>`,
  };
}

/* ------------------------------- listings ------------------------------- */

export function listingsPage({ session, rows, notice = null }) {
  return {
    title: 'Admin — listings',
    description: 'All listings on Prometheus.',
    here: '/admin/listings',
    body: `
${adminNav(session, '/admin/listings')}

<div class="wrap">

${notice ? `<div class="note" style="margin-top:1rem"><b>${escapeHtml(notice)}</b></div>` : ''}

<section class="plain">
  <h2>Listings (${rows.length})</h2>

  ${rows.length === 0
    ? `<p class="lede">No listings yet.</p>`
    : `<table>
         <thead><tr>
           <th>id</th><th>name</th><th>category</th><th>size</th>
           <th>status</th><th>created</th><th></th>
         </tr></thead>
         <tbody>
         ${rows.map((r) => renderListingRow(r)).join('\n')}
         </tbody>
       </table>`}
</section>

</div>`,
  };
}

function renderListingRow(r) {
  const withdrawn = !!r.withdrawn_at;
  const statusCell = withdrawn
    ? `<span class="pill" style="background:rgba(246,118,138,.14);color:var(--taken)">withdrawn</span>`
    : `<span class="pill p-live">active</span>`;
  const actions = withdrawn
    ? `<span style="color:var(--dim);font-size:12.5px">${escapeHtml(r.withdrawn_at)}</span>`
    : `<form method="post" action="/admin/listings/${encodeURIComponent(r.id)}/withdraw" style="margin:0"
         onsubmit="return confirm('Withdraw ' + ${JSON.stringify(r.id)} + '? Clients will stop showing it in browse.');">
         <button class="btn ghost" type="submit" style="padding:5px 10px;font-size:12.5px">Withdraw</button>
       </form>`;
  return `<tr id="${escapeHtml(r.id)}">
    <td><a href="/app/${escapeHtml(r.publisher)}/${escapeHtml(r.slug)}" target="_blank" rel="noopener"><code class="inline">${escapeHtml(r.id)}</code></a></td>
    <td>${escapeHtml(r.name)}</td>
    <td>${escapeHtml(r.category)}</td>
    <td>${formatBytes(r.download_size)}</td>
    <td>${statusCell}</td>
    <td style="color:var(--dim);font-size:12.5px">${escapeHtml(r.created_at)}</td>
    <td>${actions}</td>
  </tr>`;
}

/* ------------------------------- modes ------------------------------- */

export function modesPage({ session, modes, notice = null }) {
  const modeOptions = (selected) =>
    MODES.map((m) => `<option value="${m}"${m === selected ? ' selected' : ''}>${m}</option>`).join('');

  return {
    title: 'Admin — modes',
    description: 'Publish-mode policy per category.',
    here: '/admin/modes',
    body: `
${adminNav(session, '/admin/modes')}

<div class="wrap">

${notice ? `<div class="note" style="margin-top:1rem"><b>${escapeHtml(notice)}</b></div>` : ''}

<section class="plain">
  <h2>Publish modes</h2>
  <p class="lede">The three modes describe how new listings get accepted. The
    global default applies everywhere unless a category has its own override.
    Clear an override by picking "inherits global" from the per-category dropdown.</p>

  <div class="note">
    <b>append</b> — any valid listing goes in; readers see the signed scan report and decide.<br>
    <b>scan-first</b> — infected uploads are rejected before they land. Clean ones publish.<br>
    <b>review</b> — clean listings sit in a human-review queue before browse shows them. <em>Toggle persists; enforcement lands in a later milestone.</em>
  </div>

  <form method="post" action="/admin/modes" style="margin-top:1.6rem">
    <table>
      <thead><tr><th>Scope</th><th>Current mode</th></tr></thead>
      <tbody>
        <tr>
          <td><b>Global</b></td>
          <td>
            <select name="global" style="padding:6px 10px;background:var(--panel);border:1px solid var(--line);border-radius:8px;color:var(--ink)">
              ${modeOptions(modes.global)}
            </select>
          </td>
        </tr>
        ${CATEGORIES.map((c) => {
          const override = modes.categories[c.slug];
          return `<tr>
            <td>${c.icon} ${escapeHtml(c.title)} <code class="inline" style="font-size:11px;color:var(--dim)">${c.slug}</code></td>
            <td>
              <select name="cat_${c.slug}" style="padding:6px 10px;background:var(--panel);border:1px solid var(--line);border-radius:8px;color:var(--ink)">
                <option value=""${override ? '' : ' selected'}>— inherits global —</option>
                ${MODES.map((m) => `<option value="${m}"${override === m ? ' selected' : ''}>${m}</option>`).join('')}
              </select>
            </td>
          </tr>`;
        }).join('')}
      </tbody>
    </table>
    <button class="btn acid" type="submit" style="margin-top:1.2rem">Save modes</button>
  </form>
</section>

</div>`,
  };
}

/* ------------------------------- audit ------------------------------- */

export function auditPage({ session, entries }) {
  return {
    title: 'Admin — audit log',
    description: 'Hash-chained log of admin actions.',
    here: '/admin/audit',
    body: `
${adminNav(session, '/admin/audit')}

<div class="wrap">

<section class="plain">
  <h2>Audit log</h2>
  <p class="lede">Append-only. Each row's <code class="inline">this_hash</code>
    is computed over its own fields plus the previous row's hash — a retroactive
    edit anywhere in the chain shows up as a mismatch in the next row.</p>

  ${entries.length === 0
    ? `<p class="lede" style="margin-top:1rem">No admin actions yet.</p>`
    : `<table>
         <thead><tr>
           <th>seq</th><th>at</th><th>actor</th><th>action</th>
           <th>target</th><th>details</th><th>this_hash</th>
         </tr></thead>
         <tbody>
         ${entries.map((e) => `<tr>
           <td>${e.seq}</td>
           <td style="color:var(--dim);font-size:12px">${escapeHtml(e.at)}</td>
           <td>${escapeHtml(e.actor)}</td>
           <td>${escapeHtml(e.action)}</td>
           <td><code class="inline">${escapeHtml(e.target || '')}</code></td>
           <td style="font-size:12px;color:var(--mut);max-width:260px;word-break:break-all">${escapeHtml(e.details || '')}</td>
           <td style="font-size:11px;color:var(--dim);font-family:ui-monospace,monospace">${escapeHtml(e.this_hash.slice(0, 10))}…</td>
         </tr>`).join('')}
         </tbody>
       </table>`}
</section>

</div>`,
  };
}

/* ------------------------------- helpers ------------------------------- */

function formatBytes(n) {
  const num = Number(n) || 0;
  if (num < 1024) return `${num} B`;
  if (num < 1024 * 1024) return `${(num / 1024).toFixed(1)} KiB`;
  if (num < 1024 * 1024 * 1024) return `${(num / 1024 / 1024).toFixed(1)} MiB`;
  return `${(num / 1024 / 1024 / 1024).toFixed(2)} GiB`;
}