/**
 * static/js/app.js
 * Application bootstrap – initialises all modules, kicks off data fetching,
 * and exports shared utilities like `toast`.
 */

import { api, setUnauthorizedHandler, getStoredToken, setStoredToken } from './api.js';
import { state } from './state.js';
import { connectSSE } from './events.js';
import { initInstructions, initComposer, refreshTimestamps } from './instructions.js';
import { initStatus, initConfig, refreshStatusTimestamps } from './status.js';
import { initTheme } from './theme.js';

// ── Toast notification ────────────────────────────────────────────────────

const _toastContainer = document.getElementById('toast-container');

export function toast(message, type = 'info') {
  const el = document.createElement('div');
  el.className = `toast toast--${type}`;
  el.textContent = message;
  _toastContainer.appendChild(el);
  setTimeout(() => {
    el.style.animation = 'toast-out 240ms cubic-bezier(0.4,0,1,1) forwards';
    el.addEventListener('animationend', () => el.remove());
  }, 3000);
}

// ── Token auth modal ──────────────────────────────────────────────────────

function showTokenModal(onSuccess) {
  // Remove any existing modal
  document.getElementById('auth-modal')?.remove();

  const overlay = document.createElement('div');
  overlay.id = 'auth-modal';
  overlay.className = 'auth-overlay';
  overlay.innerHTML = `
    <div class="auth-card fade-in">
      <div class="auth-card__icon">
        <svg width="32" height="32" viewBox="0 0 24 24" fill="none" stroke="var(--cyan)" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round">
          <rect x="3" y="11" width="18" height="11" rx="2" ry="2"/>
          <path d="M7 11V7a5 5 0 0 1 10 0v4"/>
        </svg>
      </div>
      <h2 class="auth-card__title">Authentication Required</h2>
      <p class="auth-card__desc">This server requires a Bearer token.<br>Enter the value of <code>API_TOKEN</code> to continue.</p>
      <form id="auth-form" class="auth-card__form">
        <input
          id="auth-token-input"
          type="password"
          class="input"
          placeholder="Enter your API token…"
          autocomplete="current-password"
          spellcheck="false"
          autofocus
        />
        <button type="submit" class="btn btn--primary" style="width:100%">
          <svg class="icon" viewBox="0 0 24 24"><polyline points="20 6 9 17 4 12"/></svg>
          Unlock
        </button>
      </form>
      <p id="auth-error" class="auth-card__error" style="display:none">Incorrect token — try again.</p>
    </div>
  `;

  document.body.appendChild(overlay);

  const form       = overlay.querySelector('#auth-form');
  const input      = overlay.querySelector('#auth-token-input');
  const errorMsg   = overlay.querySelector('#auth-error');

  input.focus();

  form.addEventListener('submit', async (e) => {
    e.preventDefault();
    const token = input.value.trim();
    if (!token) return;

    // Optimistically store and try a quick auth ping
    setStoredToken(token);
    try {
      await api.status();
      overlay.remove();
      onSuccess();
    } catch (err) {
      // 401 means wrong token
      setStoredToken('');
      input.value = '';
      input.focus();
      errorMsg.style.display = '';
    }
  });
}

// ── Document title badge ──────────────────────────────────────────────────

function updateTitle(instructions) {
  const pending = (instructions || []).filter(i => i.status === 'pending').length;
  document.title = pending > 0 ? `(${pending}) local-mcp` : 'local-mcp';
}

// ── Reconnecting indicator ────────────────────────────────────────────────

function initReconnectingIndicator() {
  const serverLed = document.getElementById('led-server');
  state.subscribe('sseReconnecting', (reconnecting) => {
    if (!serverLed) return;
    if (reconnecting) {
      serverLed.className = 'led led--amber led--pulse';
      serverLed.querySelector('.led__label').textContent = 'Reconnecting…';
    }
  });
}

// ── Startup data load ─────────────────────────────────────────────────────

async function loadInitialData() {
  try {
    const [instructions, status, config] = await Promise.all([
      api.listInstructions('all'),
      api.status(),
      api.getConfig(),
    ]);
    state.set('instructions', instructions.items);
    state.set('status', status);
    state.set('config', config);
    state.set('serverOnline', true);
    state.set('sseReconnecting', false);
  } catch (err) {
    console.error('Failed to load initial data:', err);
    state.set('serverOnline', false);
  }
}

// ── Periodic refresh (fallback for SSE gaps) ──────────────────────────────

function startPolling() {
  setInterval(async () => {
    try {
      const s = await api.status();
      state.set('status', s);
      state.set('serverOnline', true);
    } catch {
      state.set('serverOnline', false);
    }
  }, 15_000);

  // Refresh relative timestamps every 20 seconds
  setInterval(() => { refreshTimestamps(); refreshStatusTimestamps(); }, 20_000);
}

// ── Subscribe to state changes ────────────────────────────────────────────

function initGlobalSubscriptions() {
  state.subscribe('instructions', updateTitle);
}

// ── Init ──────────────────────────────────────────────────────────────────

async function bootstrap() {
  initTheme();
  initReconnectingIndicator();
  initStatus();
  initConfig();
  initInstructions();
  initComposer();
  initGlobalSubscriptions();

  // Hook 401 handler so mid-session token expiry shows the modal again
  setUnauthorizedHandler(() => {
    showTokenModal(async () => {
      await loadInitialData();
      connectSSE();
    });
  });

  // Check whether auth is required before doing any authenticated calls
  const authInfo = await api.authCheck().catch(() => ({ auth_required: false }));

  if (authInfo.auth_required && !getStoredToken()) {
    // Show modal before loading data
    showTokenModal(async () => {
      await loadInitialData();
      connectSSE();
      startPolling();
    });
  } else {
    // No auth, or token already stored — proceed normally
    await loadInitialData();
    connectSSE();
    startPolling();
  }
}

document.addEventListener('DOMContentLoaded', bootstrap);