// AI Chat Panel — DashCaddy AI Intent Router frontend (DC-163)
//
// Fixes over the previous version:
//  - Response parsing: the API returns a FLAT ok() envelope
//    ({success:true, intent, response, appId, engine…}); the old code read
//    data.data (nonexistent) so EVERY reply showed "Sorry, something went
//    wrong". Now reads the real shape.
//  - Suggestion chips: old inline onclick used nested double quotes —
//    invalid JS, chips did nothing. Now data-attributes + listeners.
//  - Deploy button: window.openAppSelector never existed; now calls
//    window.openDeployConfigFor(id) added to app-selector.js (opens the
//    real deploy modal, same flow as clicking the app in the catalog).
//  - Conversation history (last turns) rides along so the LLM engine can
//    resolve "yes" / "name it vault" / follow-ups.
//  - Engine indicator: header shows live status from /ai/capabilities.
//  - ⚙ Settings: configure the LLM (OpenAI-compatible baseUrl/model/key)
//    stored server-side in the encrypted credential store; Test button
//    proves it end-to-end. Keys never come back from the server.
// All server/model text renders via textContent (no HTML injection).
(function () {
  let chatTurns = [];      // [{role, content}] — transcript for LLM context
  let engineInfo = { engine: 'pattern', llmConfigured: false };

  const SUGGESTIONS = [
    ['Deploy Plex', 'plex'],
    ['Stream movies', 'I want to stream movies'],
    ['Block ads', 'Block ads on my network'],
    ['System health', 'Is everything OK?'],
  ];

  function css() {
    if (document.getElementById('ai-chat-css')) return;
    const s = document.createElement('style');
    s.id = 'ai-chat-css';
    s.textContent = `
      #ai-chat-panel .ai-chip { background:rgba(99,102,241,0.15); border:1px solid rgba(99,102,241,0.3); border-radius:16px; padding:4px 12px; font-size:0.78rem; cursor:pointer; color:#a5b4fc; }
      #ai-chat-panel .ai-chip:hover { background:rgba(99,102,241,0.28); }
      #ai-chat-panel .ai-act { display:block; margin:4px 0; border-radius:8px; padding:8px 12px; cursor:pointer; font-size:0.8rem; }
      #ai-chat-panel .ai-act.deploy { background:rgba(34,197,94,0.12); border:1px solid rgba(34,197,94,0.3); color:#4ade80; }
      #ai-chat-panel .ai-act.warn { background:rgba(251,191,36,0.12); border:1px solid rgba(251,191,36,0.3); color:#fbbf24; }
      #ai-chat-panel .ai-act.blue { background:rgba(99,102,241,0.12); border:1px solid rgba(99,102,241,0.3); color:#a5b4fc; }
      #ai-chat-panel .ai-msg-user { align-self:flex-end; background:rgba(99,102,241,0.15); border-radius:10px 10px 2px 10px; padding:10px 14px; max-width:85%; font-size:0.85rem; }
      #ai-chat-panel .ai-msg-ai { align-self:flex-start; background:rgba(255,255,255,0.05); border-radius:10px 10px 10px 2px; padding:10px 14px; max-width:85%; font-size:0.85rem; }
      #ai-chat-panel .ai-note { font-size:0.7rem; color:var(--text-muted,#666); padding:4px 8px; line-height:1.4; }
      #ai-chat-panel input.ai-in { flex:1; background:var(--bg-input,#0f0f1a); border:1px solid var(--border,#333); border-radius:8px; padding:10px 14px; color:var(--text,#fff); font-size:0.88rem; outline:none; }
    `;
    document.head.appendChild(s);
  }

  function esc(s) { return String(s == null ? '' : s); }

  function createChatPanel() {
    const existing = document.getElementById('ai-chat-panel');
    if (existing) existing.remove();

    const panel = document.createElement('div');
    panel.id = 'ai-chat-panel';
    panel.style.cssText = 'position: fixed; bottom: 80px; right: 20px; width: 400px; max-width: 95vw; height: 520px; max-height: 70vh; background: var(--bg-card, #1a1a2e); border: 1px solid var(--border, #333); border-radius: 12px; display: none; flex-direction: column; z-index: 9999; box-shadow: 0 8px 32px rgba(0,0,0,0.4);';

    const header = document.createElement('div');
    header.style.cssText = 'padding: 14px 18px; border-bottom: 1px solid var(--border,#333); display: flex; align-items: center; gap: 10px;';
    const icon = document.createElement('span');
    icon.style.cssText = 'font-size:1.3rem;';
    icon.textContent = '🤖';
    const titles = document.createElement('div');
    titles.style.cssText = 'flex:1;';
    const t1 = document.createElement('div');
    t1.style.cssText = 'font-weight: 700; font-size: 0.95rem;';
    t1.textContent = 'AI Assistant';
    const t2 = document.createElement('div');
    t2.id = 'ai-status';
    t2.style.cssText = 'font-size: 0.72rem; color: var(--text-muted,#666);';
    t2.textContent = 'Loading…';
    titles.appendChild(t1); titles.appendChild(t2);
    const gear = document.createElement('button');
    gear.id = 'ai-settings-btn';
    gear.style.cssText = 'background:none;border:none;font-size:1.1rem;cursor:pointer;color:var(--text-muted,#888);';
    gear.title = 'Assistant settings';
    gear.textContent = '⚙';
    const close = document.createElement('button');
    close.style.cssText = 'background:none;border:none;font-size:1.4rem;cursor:pointer;color:var(--text-muted,#888);';
    close.title = 'Close';
    close.textContent = '×';
    close.addEventListener('click', () => { panel.style.display = 'none'; });
    header.appendChild(icon); header.appendChild(titles); header.appendChild(gear); header.appendChild(close);

    const messages = document.createElement('div');
    messages.id = 'ai-chat-messages';
    messages.style.cssText = 'flex:1; overflow-y:auto; padding:14px; display:flex; flex-direction:column; gap:10px;';

    const intro = document.createElement('div');
    intro.style.cssText = 'background:rgba(99,102,241,0.08); border-radius:10px; padding:12px; font-size:0.85rem; color:var(--text-muted,#aaa);';
    intro.textContent = '👋 Hi! I can help you deploy apps, diagnose issues, and manage your server. Try:';
    const chips = document.createElement('div');
    chips.style.cssText = 'margin-top:8px; display:flex; flex-wrap:wrap; gap:6px;';
    SUGGESTIONS.forEach(([label, text]) => {
      const b = document.createElement('button');
      b.className = 'ai-chip';
      b.textContent = label;
      b.addEventListener('click', () => send(text));
      chips.appendChild(b);
    });
    intro.appendChild(chips);
    messages.appendChild(intro);

    const foot = document.createElement('div');
    foot.style.cssText = 'padding:12px; border-top:1px solid var(--border,#333);';
    const row = document.createElement('div');
    row.style.cssText = 'display:flex; gap:8px;';
    const input = document.createElement('input');
    input.id = 'ai-chat-input';
    input.type = 'text';
    input.placeholder = 'Ask me anything...';
    input.className = 'ai-in';
    input.addEventListener('keydown', (e) => { if (e.key === 'Enter') send(); });
    const go = document.createElement('button');
    go.style.cssText = 'background:#6366f1; border:none; border-radius:8px; padding:0 16px; color:#fff; cursor:pointer; font-weight:600;';
    go.textContent = '→';
    go.addEventListener('click', () => send());
    row.appendChild(input); row.appendChild(go);
    foot.appendChild(row);

    panel.appendChild(header); panel.appendChild(messages); panel.appendChild(foot);
    document.body.appendChild(panel);
  }

  function toggle() {
    let panel = document.getElementById('ai-chat-panel');
    if (!panel) { css(); createChatPanel(); panel = document.getElementById('ai-chat-panel'); refreshEngineBadge(); }
    panel.style.display = panel.style.display === 'flex' ? 'none' : 'flex';
    if (panel.style.display === 'flex') document.getElementById('ai-chat-input').focus();
  }

  async function refreshEngineBadge() {
    try {
      const res = await fetch('/api/v1/ai/capabilities');
      const data = await res.json();
      if (data && data.success) {
        engineInfo = { engine: data.engine, llmConfigured: Boolean(data.llm && data.llm.configured) };
        const el = document.getElementById('ai-status');
        if (el) el.textContent = engineInfo.llmConfigured
          ? 'LLM engine: ' + (data.llm.model || 'configured')
          : 'Pattern engine (offline) — ⚙ to add an LLM';
      }
    } catch (_) { /* badge stays */ }
  }

  function addMessage(role, text, extra) {
    const container = document.getElementById('ai-chat-messages');
    if (!container) return;
    const div = document.createElement('div');
    div.className = role === 'user' ? 'ai-msg-user' : 'ai-msg-ai';
    div.textContent = text;
    container.appendChild(div);
    chatTurns.push({ role: role === 'user' ? 'user' : 'assistant', content: text });
    if (chatTurns.length > 12) chatTurns = chatTurns.slice(-12);

    if (extra) {
      const extraDiv = document.createElement('div');
      extraDiv.style.cssText = 'align-self:flex-start; max-width:85%; margin-top:4px;';
      if (extra.engine === 'llm-error' || extra.llmError) {
        const n = document.createElement('div');
        n.className = 'ai-note';
        n.textContent = '⚠ LLM unavailable — answered with the offline pattern engine.';
        extraDiv.appendChild(n);
      }
      if (extra.disclaimer) {
        const disc = document.createElement('div');
        disc.className = 'ai-note';
        disc.textContent = '⚠ ' + esc(extra.disclaimer);
        extraDiv.appendChild(disc);
      }
      if (Array.isArray(extra.recommendations)) {
        extra.recommendations.forEach((rec) => {
          const btn = document.createElement('button');
          btn.className = 'ai-act deploy';
          btn.textContent = `📦 Deploy ${esc(rec.app)} — ${esc(rec.reason || '')}`;
          btn.addEventListener('click', () => send('Deploy ' + rec.app));
          extraDiv.appendChild(btn);
        });
      }
      if (extra.appId) {
        const btn = document.createElement('button');
        btn.className = 'ai-act deploy';
        btn.textContent = `🚀 Deploy ${esc(extra.appName || extra.appId)}`;
        btn.addEventListener('click', () => deploy(extra.appId));
        extraDiv.appendChild(btn);
      }
      if (extra.action === 'diagnose') {
        const btn = document.createElement('button');
        btn.className = 'ai-act warn';
        btn.textContent = '🔍 Run Diagnostics';
        btn.addEventListener('click', () => { window.location.href = '#health'; });
        extraDiv.appendChild(btn);
      }
      if (extra.action === 'backup') {
        const btn = document.createElement('button');
        btn.className = 'ai-act blue';
        btn.textContent = '💾 Create Backup';
        btn.addEventListener('click', () => { if (window.createBackup) window.createBackup(); });
        extraDiv.appendChild(btn);
      }
      if (Array.isArray(extra.suggestions)) {
        const list = document.createElement('div');
        list.className = 'ai-note';
        list.textContent = 'Try: ' + extra.suggestions.join(' · ');
        extraDiv.appendChild(list);
      }
      container.appendChild(extraDiv);
    }
    container.scrollTop = container.scrollHeight;
  }

  async function send(prefilled) {
    const input = document.getElementById('ai-chat-input');
    const raw = prefilled || (input && input.value.trim()) || '';
    if (!raw) return;
    if (input) input.value = '';

    addMessage('user', raw);

    const container = document.getElementById('ai-chat-messages');
    const typing = document.createElement('div');
    typing.style.cssText = 'align-self:flex-start; color:var(--text-muted,#666); font-size:0.8rem; padding:8px 14px;';
    typing.textContent = '🤖 Thinking...';
    container.appendChild(typing);
    container.scrollTop = container.scrollHeight;

    try {
      const res = await secureFetch('/api/v1/ai/intent', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        // history: prior turns EXCLUDING the just-added user line
        body: JSON.stringify({ message: raw.slice(0, 1000), history: chatTurns.slice(0, -1) }),
      });
      const data = await res.json();
      typing.remove();

      if (data && data.success !== false && data.intent) {
        const resp = data.response || {};
        const text = resp.message || data.llmReply || ('Action: ' + (data.action || data.intent));
        addMessage('ai', text, {
          ...resp,
          engine: data.engine,
          llmError: data.llmError,
          appId: data.appId || resp.appId,
          appName: data.appName || resp.appName,
          action: data.intent,
          suggestions: resp.suggestions,
        });
        const badge = document.getElementById('ai-status');
        if (badge && data.engine === 'llm') {
          // remember live engine flip (config could have just been set)
          engineInfo.engine = 'llm';
        }
      } else {
        addMessage('ai', (data && data.error) || 'Sorry, something went wrong.');
      }
    } catch (e) {
      typing.remove();
      addMessage('ai', 'Connection error: ' + e.message);
    }
  }

  async function deploy(appId) {
    if (typeof window.openDeployConfigFor === 'function') {
      const r = await window.openDeployConfigFor(appId);
      if (r === true) { addMessage('ai', `Opened the deploy setup for ${appId} — pick a subdomain and confirm.`); return; }
      if (r === 'selector') { addMessage('ai', `${appId} is a dashboard widget — open it from the app grid to toggle it.`); return; }
    }
    addMessage('ai', `Template "${appId}" not found in the catalog. Open the + menu to browse apps.`);
  }

  // ── ⚙ settings modal ──────────────────────────────────────────────────────
  function openSettings() {
    const old = document.getElementById('ai-llm-settings-modal');
    if (old) old.remove();
    const m = document.createElement('div');
    m.id = 'ai-llm-settings-modal';
    m.style.cssText = 'position:fixed; inset:0; background:rgba(0,0,0,0.6); z-index:10000; display:flex; align-items:center; justify-content:center;';
    m.innerHTML = `
      <div style="background:var(--bg-card,#16162a); border:1px solid var(--border,#333); border-radius:12px; padding:20px; width:420px; max-width:92vw; display:flex; flex-direction:column; gap:10px;">
        <div style="font-weight:700;">AI assistant — LLM engine</div>
        <div class="ai-note" style="color:var(--text-muted,#888); font-size:0.75rem;">Any OpenAI-compatible endpoint. Stored in the encrypted credential store (never in browser-exposed config). Leave the key blank to keep the stored one. Without an LLM the assistant still works on the offline pattern engine.</div>
        <label style="font-size:0.78rem;">Base URL <input id="ai-cfg-base" class="ai-in" placeholder="https://api.example.com/v1" style="width:100%;box-sizing:border-box;"></label>
        <label style="font-size:0.78rem;">Model <input id="ai-cfg-model" class="ai-in" placeholder="gpt-4o-mini"></label>
        <label style="font-size:0.78rem;">API key <input id="ai-cfg-key" class="ai-in" type="password" autocomplete="off" placeholder="stored key unchanged"></label>
        <div id="ai-cfg-state" class="ai-note"></div>
        <div style="display:flex; gap:8px; justify-content:flex-end;">
          <button id="ai-cfg-test" class="ai-act blue">Test</button>
          <button id="ai-cfg-save" class="ai-act deploy">Save</button>
          <button id="ai-cfg-clear" class="ai-act warn">Remove LLM</button>
          <button id="ai-cfg-close" class="ai-act">Close</button>
        </div>
      </div>`;
    document.body.appendChild(m);
    const $ = (id) => document.getElementById(id);
    const state = (t) => { $('ai-cfg-state').textContent = t; };

    fetch('/api/v1/ai/settings').then((r) => r.json()).then((d) => {
      if (d && d.success) {
        $('ai-cfg-base').value = d.baseUrl || '';
        $('ai-cfg-model').value = d.model || '';
        state(d.configured ? `Active via ${d.source}. ${d.hasApiKey ? 'Key stored.' : 'No key.'}` : 'Not configured — pattern engine in use.');
        if (d.source === 'env') $('ai-cfg-key').placeholder = 'env key in use — set to override';
      }
    }).catch(() => state('Could not load current settings.'));

    $('ai-cfg-close').onclick = () => m.remove();
    m.addEventListener('click', (e) => { if (e.target === m) m.remove(); });
    $('ai-cfg-save').onclick = async () => {
      state('Saving…');
      try {
        const r = await secureFetch('/api/v1/ai/settings', {
          method: 'PUT',
          headers: { 'Content-Type': 'application/json' },
          body: JSON.stringify({ baseUrl: $('ai-cfg-base').value, model: $('ai-cfg-model').value, apiKey: $('ai-cfg-key').value }),
        });
        const d = await r.json();
        state(d.success ? 'Saved. The assistant now classifies with ' + (d.model || 'your model') + '.' : (d.error || 'Save failed.'));
        if (d.success) { $('ai-cfg-key').value = ''; refreshEngineBadge(); }
      } catch (e) { state('Save error: ' + e.message); }
    };
    $('ai-cfg-test').onclick = async () => {
      state('Testing… (one classification round-trip)');
      try {
        const r = await secureFetch('/api/v1/ai/settings/test', { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: '{}' });
        const d = await r.json();
        if (d.success && d.ok) state(`✅ Works — sample: "${d.sample.intent}"${d.sample.reply ? ' — ' + d.sample.reply : ''}`);
        else state('❌ ' + (d.reason || d.error || 'test failed'));
      } catch (e) { state('Test error: ' + e.message); }
    };
    $('ai-cfg-clear').onclick = async () => {
      state('Removing…');
      try {
        const r = await secureFetch('/api/v1/ai/settings', { method: 'DELETE' });
        const d = await r.json();
        state(d.success ? 'Removed — pattern engine active.' : (d.error || 'failed'));
        refreshEngineBadge();
      } catch (e) { state('Error: ' + e.message); }
    };
  }

  document.addEventListener('click', (e) => {
    if (e.target && e.target.id === 'ai-settings-btn') openSettings();
  }, true);

  window.aiChat = { send, deploy, toggle };
  window.toggleAIChat = toggle;
})();