import { getToken, isLoggedIn } from './auth.js';

const API_URL = '/api';

let galleryStacks = [];

export function initGallery(getSelectedApps, getConfig) {
  loadGallery();

  document.getElementById('gallery-search').addEventListener('input', debounce(loadGallery, 300));
  document.getElementById('gallery-sort').addEventListener('change', loadGallery);

  // Share button
  document.getElementById('share-stack-btn').addEventListener('click', () => {
    if (!isLoggedIn()) {
      document.getElementById('auth-modal').classList.remove('hidden');
      return;
    }
    if (getSelectedApps().length === 0) {
      alert('Select some apps in the Stack Builder first!');
      return;
    }
    document.getElementById('share-modal').classList.remove('hidden');
  });

  document.getElementById('share-modal-close').addEventListener('click', () => {
    document.getElementById('share-modal').classList.add('hidden');
  });

  document.getElementById('share-form').addEventListener('submit', async (e) => {
    e.preventDefault();
    const name = document.getElementById('share-name').value.trim();
    const desc = document.getElementById('share-desc').value.trim();
    const tags = document.getElementById('share-tags').value.split(',').map(t => t.trim()).filter(Boolean);

    const res = await fetch(`${API_URL}/stacks`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json', Authorization: `Bearer ${getToken()}` },
      body: JSON.stringify({
        name,
        description: desc,
        apps: getSelectedApps(),
        config: getConfig(),
        tags,
      }),
    });

    if (res.ok) {
      document.getElementById('share-modal').classList.add('hidden');
      document.getElementById('share-form').reset();
      loadGallery();
    }
  });
}

async function loadGallery() {
  const search = document.getElementById('gallery-search').value.trim();
  const sort = document.getElementById('gallery-sort').value;

  let url = `${API_URL}/stacks?sort=${sort}&limit=30`;
  if (search) url += `&search=${encodeURIComponent(search)}`;

  try {
    const res = await fetch(url, {
      headers: getToken() ? { Authorization: `Bearer ${getToken()}` } : {},
    });
    if (res.ok) {
      galleryStacks = await res.json();
      renderGallery();
    }
  } catch (e) {
    document.getElementById('gallery-grid').innerHTML = '<p style="color:var(--text-muted)">Unable to load community stacks. Is the API running?</p>';
  }
}

function renderGallery() {
  const grid = document.getElementById('gallery-grid');
  if (galleryStacks.length === 0) {
    grid.innerHTML = '<p style="color:var(--text-muted)">No stacks shared yet. Be the first!</p>';
    return;
  }

  grid.innerHTML = galleryStacks.map(stack => `
    <div class="stack-card" data-id="${stack.id}">
      <div class="stack-name">${esc(stack.name)}</div>
      <div class="stack-desc">${esc(stack.description || '')}</div>
      <div class="stack-apps">${stack.apps.slice(0, 8).map(a => `<span class="stack-app-tag">${a}</span>`).join('')}${stack.apps.length > 8 ? `<span class="stack-app-tag">+${stack.apps.length - 8}</span>` : ''}</div>
      <div class="stack-meta">
        <span>⭐ ${stack.stars}</span>
        <span>📦 ${stack.downloads}</span>
        <span>by ${esc(stack.display_name || stack.username)}</span>
      </div>
      <div class="stack-actions">
        <button class="stack-action-btn${stack.starred_by_me ? ' starred' : ''}" data-action="star" data-id="${stack.id}">${stack.starred_by_me ? '⭐ Starred' : '☆ Star'}</button>
        <button class="stack-action-btn" data-action="use" data-id="${stack.id}">🚀 Use This Stack</button>
      </div>
    </div>
  `).join('');

  // Event listeners
  grid.querySelectorAll('[data-action="star"]').forEach(btn => {
    btn.addEventListener('click', () => starStack(btn.dataset.id));
  });
  grid.querySelectorAll('[data-action="use"]').forEach(btn => {
    btn.addEventListener('click', () => useStack(btn.dataset.id));
  });
}

async function starStack(id) {
  if (!isLoggedIn()) {
    document.getElementById('auth-modal').classList.remove('hidden');
    return;
  }
  await fetch(`${API_URL}/stacks/${id}/star`, {
    method: 'POST',
    headers: { Authorization: `Bearer ${getToken()}` },
  });
  loadGallery();
}

async function useStack(id) {
  const stack = galleryStacks.find(s => s.id === parseInt(id));
  if (!stack) return;

  // Track download
  fetch(`${API_URL}/stacks/${id}/download`, { method: 'POST' });

  // Dispatch event for main.js to load these apps
  window.dispatchEvent(new CustomEvent('use-stack', { detail: { apps: stack.apps, config: stack.config } }));

  // Switch to builder mode
  document.querySelectorAll('.mode-btn').forEach(b => b.classList.remove('active'));
  document.querySelector('.mode-btn[data-mode="builder"]').classList.add('active');
  document.querySelector('.container').style.display = 'block';
  document.getElementById('step-gallery').style.display = 'none';
  document.getElementById('step-analyser').style.display = 'none';
}

function esc(str) {
  return str.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
}

function debounce(fn, ms) {
  let timer;
  return (...args) => { clearTimeout(timer); timer = setTimeout(() => fn(...args), ms); };
}