/**
 * Q-Simplified — Shared Utilities
 * Include this in every page: <script src="/js/app.js"></script>
 */

// ─── CONFIG ────────────────────────────────────────────────────────────────
const QS = {
  API_BASE: '',  // Same origin  // ← Update after Railway deploy

  VERSION: '1.0.0',
};

// ─── AUTH MODULE ───────────────────────────────────────────────────────────
const Auth = {
  getToken() {
    const token = localStorage.getItem('qs_token');
    const exp   = +localStorage.getItem('qs_token_exp');
    if (!token || Date.now() > exp) return null;
    return token;
  },

  getUser() {
    try { return JSON.parse(localStorage.getItem('qs_user') || 'null'); }
    catch { return null; }
  },

  isLoggedIn() { return !!this.getToken(); },

  save(data) {
    localStorage.setItem('qs_token', data.access_token);
    localStorage.setItem('qs_user', JSON.stringify(data.user));
    localStorage.setItem('qs_token_exp', Date.now() + data.expires_in * 1000);
  },

  logout() {
    ['qs_token', 'qs_user', 'qs_token_exp'].forEach(k => localStorage.removeItem(k));
    window.location.href = '/login.html';
  },

  requireAuth(redirectAfter = window.location.href) {
    if (!this.isLoggedIn()) {
      window.location.href = `/login.html?redirect=${encodeURIComponent(redirectAfter)}`;
      return false;
    }
    return true;
  },

  authHeaders() {
    const token = this.getToken();
    return token ? { 'Authorization': `Bearer ${token}` } : {};
  },
};

// ─── API MODULE ────────────────────────────────────────────────────────────
const API = {
  async get(path) {
    const res = await fetch(`${QS.API_BASE}${path}`, {
      headers: { ...Auth.authHeaders(), 'Content-Type': 'application/json' }
    });
    if (res.status === 401) { Auth.logout(); return null; }
    if (!res.ok) throw new Error(`API Error ${res.status}`);
    return res.json();
  },

  async post(path, body) {
    const res = await fetch(`${QS.API_BASE}${path}`, {
      method: 'POST',
      headers: { ...Auth.authHeaders(), 'Content-Type': 'application/json' },
      body: JSON.stringify(body),
    });
    const data = await res.json();
    if (!res.ok) throw new Error(data.detail || 'Request failed');
    return data;
  },

  async put(path, body) {
    const res = await fetch(`${QS.API_BASE}${path}`, {
      method: 'PUT',
      headers: { ...Auth.authHeaders(), 'Content-Type': 'application/json' },
      body: JSON.stringify(body),
    });
    const data = await res.json();
    if (!res.ok) throw new Error(data.detail || 'Request failed');
    return data;
  },

  async delete(path) {
    const res = await fetch(`${QS.API_BASE}${path}`, {
      method: 'DELETE',
      headers: { ...Auth.authHeaders() },
    });
    if (res.status === 204) return null;
    const data = await res.json();
    if (!res.ok) throw new Error(data.detail || 'Request failed');
    return data;
  },

  async postForm(path, formData) {
    const res = await fetch(`${QS.API_BASE}${path}`, {
      method: 'POST',
      headers: { ...Auth.authHeaders() },
      body: formData,
    });
    const data = await res.json();
    if (!res.ok) throw new Error(data.detail || 'Upload failed');
    return data;
  },

  // Convenience
  market: {
    getLatest:  () => API.get('/api/market-data/latest'),
    getHistory: (symbol, period='1mo', interval) =>
      API.get(`/api/market-data/history/${encodeURIComponent(symbol)}?period=${period}${interval ? '&interval=' + interval : ''}`),
  },
  news: {
    getInsights: () => API.get('/api/news/live-insights'),
    getLatest:   (limit=20, category=null) => API.get(`/api/news/latest?limit=${limit}${category?'&category='+category:''}`),
  },
  blogs: {
    getAll:     (opts={}) => API.get(`/api/blogs?limit=${opts.limit||20}&offset=${opts.offset||0}${opts.category?'&category='+opts.category:''}`),
    getFeatured: () => API.get('/api/blogs/featured'),
    getRecent:   (n=3) => API.get(`/api/blogs/recent?limit=${n}`),
    getOne:      (slug) => API.get(`/api/blogs/${slug}`),
    create:   (body) => API.post('/api/blogs', body),
    update:   (slug, body) => API.put(`/api/blogs/${slug}`, body),
    remove:   (slug) => API.delete(`/api/blogs/${slug}`),
    getMine:  (published) => API.get(`/api/blogs/mine${published !== undefined ? '?published=' + published : ''}`),
  },
  upload: {
    image: (file) => {
      const fd = new FormData();
      fd.append('file', file);
      return API.postForm('/api/upload/image', fd);
    },
  },
};

// ─── NAV AUTO-UPDATE ───────────────────────────────────────────────────────
function initNav() {
  const user = Auth.getUser();
  const btn  = document.getElementById('nav-auth-btn');
  if (!btn) return;

  if (user && Auth.isLoggedIn()) {
    btn.textContent = user.full_name?.split(' ')[0] || 'Account';
    btn.href = '/profile.html';
    btn.style.background = 'rgba(255,255,255,0.1)';
  }
}

// ─── TOAST NOTIFICATIONS ──────────────────────────────────────────────────
function showToast(msg, type='info', duration=3000) {
  const colors = { info:'#003465', success:'#1a7a4a', error:'#c0392b' };
  const toast = document.createElement('div');
  toast.style.cssText = `
    position:fixed;bottom:1.5rem;right:1.5rem;z-index:9999;
    background:${colors[type]||colors.info};color:#fff;
    padding:0.875rem 1.25rem;border-radius:9999px;
    font-family:'Work Sans',sans-serif;font-size:0.875rem;font-weight:500;
    box-shadow:0 8px 32px rgba(0,0,0,0.2);
    animation:slideIn 0.3s ease;
    max-width:340px;
  `;
  toast.textContent = msg;
  document.body.appendChild(toast);

  if (!document.getElementById('toast-style')) {
    const s = document.createElement('style');
    s.id = 'toast-style';
    s.textContent = '@keyframes slideIn{from{transform:translateY(1rem);opacity:0}to{transform:translateY(0);opacity:1}}';
    document.head.appendChild(s);
  }

  setTimeout(() => { toast.style.opacity='0'; toast.style.transition='opacity 0.3s'; setTimeout(()=>toast.remove(),300); }, duration);
}

// ─── FORMAT HELPERS ───────────────────────────────────────────────────────
const Format = {
  currency:  (n) => '₹' + n.toLocaleString('en-IN'),
  number:    (n) => n.toLocaleString('en-IN'),
  pct:       (n) => (n > 0 ? '+' : '') + n.toFixed(2) + '%',
  timeAgo(dateStr) {
    const diff = Date.now() - new Date(dateStr).getTime();
    const mins = Math.floor(diff / 60000);
    const hrs  = Math.floor(diff / 3600000);
    const days = Math.floor(diff / 86400000);
    if (mins < 60)  return mins <= 1 ? 'Just now' : `${mins} mins ago`;
    if (hrs  < 24)  return `${hrs} hour${hrs>1?'s':''} ago`;
    if (days < 7)   return `${days} day${days>1?'s':''} ago`;
    return new Date(dateStr).toLocaleDateString('en-IN', { day:'numeric', month:'short', year:'numeric' });
  },
};

// ─── INIT ON PAGE LOAD ─────────────────────────────────────────────────────
document.addEventListener('DOMContentLoaded', initNav);

// Export for use in page scripts
window.QS     = QS;
window.Auth   = Auth;
window.API    = API;
window.Format = Format;
window.showToast = showToast;