// Discord guild data cache
let guildData = null;
let guildDataPromise = null;

async function fetchGuildData() {
  if (guildData) return guildData;
  if (guildDataPromise) return guildDataPromise;
  guildDataPromise = fetch('/api/discord/guild')
    .then(r => r.json())
    .then(data => { guildData = data; return data; })
    .catch(() => ({ channels: [], roles: [], members: [], categories: [] }));
  return guildDataPromise;
}

async function renderChannelSelect(el, currentValue, filter) {
  const data = await fetchGuildData();
  const channels = filter ? data.channels.filter(filter) : data.channels;
  renderSmartSelect(el, channels.map(c => ({
    id: c.id,
    label: `#${c.name}`,
    sub: c.parentId ? (data.categories.find(cat => cat.id === c.parentId)?.name || null) : null
  })), currentValue);
}

async function renderCategorySelect(el, currentValue) {
  const data = await fetchGuildData();
  renderSmartSelect(el, data.categories.map(c => ({ id: c.id, label: c.name })), currentValue);
}

async function renderRoleSelect(el, currentValue) {
  const data = await fetchGuildData();
  renderSmartSelect(el, data.roles.map(r => ({ id: r.id, label: `@${r.name}`, color: r.color })), currentValue);
}

async function renderMemberSelect(el, currentValue) {
  const data = await fetchGuildData();
  renderSmartSelect(el, data.members.map(m => ({
    id: m.id, label: m.displayName, sub: `@${m.username}`, avatar: m.avatar
  })), currentValue);
}

async function renderMultiMemberSelect(el, currentValue) {
  const data = await fetchGuildData();
  const currentIds = (currentValue || '').split(',').map(s => s.trim()).filter(Boolean);
  renderMultiSelect(el, data.members.map(m => ({
    id: m.id, label: m.displayName, sub: `@${m.username}`, avatar: m.avatar
  })), currentIds);
}

function renderSmartSelect(inputEl, options, currentValue) {
  const wrapper = document.createElement('div');
  wrapper.className = 'smart-select';

  const current = options.find(o => o.id === currentValue);
  const display = document.createElement('div');
  display.className = 'smart-select-display';
  display.innerHTML = current
    ? `<span class="ss-label">${current.label}</span><span class="ss-id">${current.id}</span>`
    : `<span class="ss-placeholder">Not set</span>`;

  const dropdown = document.createElement('div');
  dropdown.className = 'smart-select-dropdown hidden';

  const search = document.createElement('input');
  search.type = 'text';
  search.placeholder = 'Search...';
  search.className = 'ss-search';

  const list = document.createElement('div');
  list.className = 'ss-list';

  const clearOpt = document.createElement('div');
  clearOpt.className = 'ss-option ss-clear';
  clearOpt.textContent = 'Clear (not set)';
  clearOpt.addEventListener('click', () => {
    inputEl.value = '';
    display.innerHTML = `<span class="ss-placeholder">Not set</span>`;
    dropdown.classList.add('hidden');
    inputEl.dispatchEvent(new Event('change'));
  });
  list.appendChild(clearOpt);

  function renderOptions(filter = '') {
    while (list.children.length > 1) list.removeChild(list.lastChild);
    const filtered = filter
      ? options.filter(o => o.label.toLowerCase().includes(filter.toLowerCase()) || (o.sub || '').toLowerCase().includes(filter.toLowerCase()) || o.id.includes(filter))
      : options;
    for (const opt of filtered.slice(0, 50)) {
      const item = document.createElement('div');
      item.className = 'ss-option' + (opt.id === inputEl.value ? ' selected' : '');
      let inner = '';
      if (opt.avatar) inner += `<img class="ss-avatar" src="${opt.avatar}" alt="">`;
      if (opt.color && opt.color !== '#000000') inner += `<span class="ss-dot" style="background:${opt.color}"></span>`;
      inner += `<span class="ss-label">${opt.label}</span>`;
      if (opt.sub) inner += `<span class="ss-sub">${opt.sub}</span>`;
      item.innerHTML = inner;
      item.addEventListener('click', () => {
        inputEl.value = opt.id;
        display.innerHTML = `<span class="ss-label">${opt.label}</span><span class="ss-id">${opt.id}</span>`;
        dropdown.classList.add('hidden');
        inputEl.dispatchEvent(new Event('change'));
      });
      list.appendChild(item);
    }
  }

  renderOptions();
  search.addEventListener('input', () => renderOptions(search.value));
  display.addEventListener('click', () => {
    dropdown.classList.toggle('hidden');
    if (!dropdown.classList.contains('hidden')) search.focus();
  });
  document.addEventListener('click', (e) => {
    if (!wrapper.contains(e.target)) dropdown.classList.add('hidden');
  });

  dropdown.appendChild(search);
  dropdown.appendChild(list);
  wrapper.appendChild(display);
  wrapper.appendChild(dropdown);
  inputEl.style.display = 'none';
  inputEl.parentNode.insertBefore(wrapper, inputEl.nextSibling);
}

function renderMultiSelect(inputEl, options, currentIds) {
  const wrapper = document.createElement('div');
  wrapper.className = 'smart-select';
  const selected = new Set(currentIds);

  function updateInput() {
    inputEl.value = [...selected].join(',');
    inputEl.dispatchEvent(new Event('change'));
  }

  function renderChips() {
    chipsEl.innerHTML = '';
    for (const id of selected) {
      const opt = options.find(o => o.id === id);
      const chip = document.createElement('span');
      chip.className = 'ss-option selected';
      chip.style.cssText = 'display:inline-flex;padding:4px 8px;margin:2px;border-radius:12px;font-size:12px;cursor:pointer;';
      chip.textContent = opt ? opt.label : id;
      chip.title = 'Click to remove';
      chip.addEventListener('click', () => { selected.delete(id); renderChips(); updateInput(); });
      chipsEl.appendChild(chip);
    }
  }

  const chipsEl = document.createElement('div');
  chipsEl.style.cssText = 'display:flex;flex-wrap:wrap;gap:4px;margin-bottom:8px;';
  renderChips();

  const addBtn = document.createElement('div');
  addBtn.className = 'smart-select-display';
  addBtn.innerHTML = '<span class="ss-placeholder">+ Add</span>';

  const dropdown = document.createElement('div');
  dropdown.className = 'smart-select-dropdown hidden';
  const search = document.createElement('input');
  search.type = 'text'; search.placeholder = 'Search...'; search.className = 'ss-search';
  const list = document.createElement('div');
  list.className = 'ss-list';

  function renderOptions(filter = '') {
    list.innerHTML = '';
    const filtered = filter
      ? options.filter(o => !selected.has(o.id) && (o.label.toLowerCase().includes(filter.toLowerCase()) || o.id.includes(filter)))
      : options.filter(o => !selected.has(o.id));
    for (const opt of filtered.slice(0, 50)) {
      const item = document.createElement('div');
      item.className = 'ss-option';
      let inner = '';
      if (opt.avatar) inner += `<img class="ss-avatar" src="${opt.avatar}" alt="">`;
      inner += `<span class="ss-label">${opt.label}</span>`;
      if (opt.sub) inner += `<span class="ss-sub">${opt.sub}</span>`;
      item.innerHTML = inner;
      item.addEventListener('click', () => { selected.add(opt.id); renderChips(); renderOptions(search.value); updateInput(); });
      list.appendChild(item);
    }
  }
  renderOptions();
  search.addEventListener('input', () => renderOptions(search.value));
  addBtn.addEventListener('click', () => { dropdown.classList.toggle('hidden'); if (!dropdown.classList.contains('hidden')) search.focus(); });
  document.addEventListener('click', (e) => { if (!wrapper.contains(e.target)) dropdown.classList.add('hidden'); });

  dropdown.appendChild(search);
  dropdown.appendChild(list);
  wrapper.appendChild(chipsEl);
  wrapper.appendChild(addBtn);
  wrapper.appendChild(dropdown);
  inputEl.style.display = 'none';
  inputEl.parentNode.insertBefore(wrapper, inputEl.nextSibling);
}

window.DiscordFields = { fetchGuildData, renderChannelSelect, renderCategorySelect, renderRoleSelect, renderMemberSelect, renderMultiMemberSelect };