let savedConfig = {};
let pendingChanges = {};

async function init() {
  document.getElementById('loading').classList.remove('hidden');
  try {
    const [config] = await Promise.all([
      fetch('/api/config').then(r => r.json()),
      DiscordFields.fetchGuildData()
    ]);
    savedConfig = config;
    document.getElementById('bot-status-dot').className = 'dot online';
    document.getElementById('bot-status-text').textContent = 'Connected';
    populateFields(config);
    initSmartSelects(config);
  } catch (e) {
    document.getElementById('bot-status-dot').className = 'dot offline';
    document.getElementById('bot-status-text').textContent = 'Unreachable';
  }
  document.getElementById('loading').classList.add('hidden');
  setupSectionToggles();
  setupSaveBar();
}

function populateFields(config) {
  document.querySelectorAll('[data-key]').forEach(el => {
    const key = el.dataset.key;
    const value = config[key] || '';
    if (el.type === 'checkbox') {
      el.checked = value === 'true' || value === true;
    } else if (el.type === 'color') {
      // Convert 0xRRGGBB to #RRGGBB
      const num = parseInt(value) || 0;
      el.value = '#' + num.toString(16).padStart(6, '0');
    } else {
      el.value = value;
    }
    el.addEventListener('change', () => handleFieldChange(el, key));
    el.addEventListener('input', () => {
      if (el.type === 'text' || el.type === 'number' || el.type === 'password' || el.tagName === 'TEXTAREA') {
        handleFieldChange(el, key);
      }
    });
  });
}

function handleFieldChange(el, key) {
  let value;
  if (el.type === 'checkbox') {
    value = el.checked ? 'true' : 'false';
  } else if (el.type === 'color') {
    value = '0x' + el.value.slice(1).toUpperCase();
  } else {
    value = el.value;
  }
  markChanged(key, value);
  el.classList.toggle('changed', key in pendingChanges);
}

function initSmartSelects(config) {
  document.querySelectorAll('[data-smart]').forEach(el => {
    const key = el.dataset.key;
    const type = el.dataset.smart;
    const value = config[key] || '';
    if (type === 'channel') DiscordFields.renderChannelSelect(el, value);
    else if (type === 'category') DiscordFields.renderCategorySelect(el, value);
    else if (type === 'role') DiscordFields.renderRoleSelect(el, value);
    else if (type === 'member') DiscordFields.renderMemberSelect(el, value);
    else if (type === 'multi-member') DiscordFields.renderMultiMemberSelect(el, value);
  });
}

function setupSectionToggles() {
  document.querySelectorAll('.section-header').forEach(header => {
    header.addEventListener('click', () => {
      header.closest('.section').classList.toggle('collapsed');
    });
  });
  // Sidebar navigation
  document.querySelectorAll('.sidebar a').forEach(link => {
    link.addEventListener('click', (e) => {
      e.preventDefault();
      const target = document.getElementById(link.getAttribute('href').slice(1));
      if (target) {
        target.scrollIntoView({ behavior: 'smooth', block: 'start' });
        target.classList.remove('collapsed');
      }
      document.querySelectorAll('.sidebar a').forEach(l => l.classList.remove('active'));
      link.classList.add('active');
    });
  });
}

function markChanged(key, value) {
  if (String(value) === String(savedConfig[key] || '')) {
    delete pendingChanges[key];
  } else {
    pendingChanges[key] = value;
  }
  updateSaveBar();
}

function setupSaveBar() {
  updateSaveBar();
}

function updateSaveBar() {
  const bar = document.getElementById('save-bar');
  const count = Object.keys(pendingChanges).length;
  bar.classList.toggle('visible', count > 0);
  document.getElementById('change-count').textContent =
    `${count} unsaved change${count !== 1 ? 's' : ''}`;
}

async function saveConfig(mode) {
  try {
    const res = await fetch('/api/config', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(pendingChanges)
    });
    const data = await res.json();
    if (data.applied) {
      for (const key of data.applied) savedConfig[key] = pendingChanges[key];
      pendingChanges = {};
      updateSaveBar();
      document.querySelectorAll('.changed').forEach(el => el.classList.remove('changed'));
      showToast(`${data.applied.length} settings saved.`, 'success');
    }
    if (data.errors && data.errors.length > 0) {
      showToast(`Errors: ${data.errors.join(', ')}`, 'error');
    }
    if (mode === 'restart') {
      await fetch('/api/restart', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ mode: 'immediate' })
      });
      showToast('Restart initiated.', 'warning');
    }
  } catch (e) {
    showToast('Failed to save. Bot may be unreachable.', 'error');
  }
}

function openScheduleModal() {
  const modal = document.getElementById('schedule-modal');
  modal.classList.remove('hidden');
  const dt = document.getElementById('schedule-datetime');
  const min = new Date(Date.now() + 60000).toISOString().slice(0, 16);
  dt.min = min;
  dt.value = min;
}

async function confirmScheduledRestart() {
  const dt = document.getElementById('schedule-datetime').value;
  if (!dt) return;
  await fetch('/api/restart', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ mode: 'scheduled', scheduledFor: new Date(dt).toISOString() })
  });
  document.getElementById('schedule-modal').classList.add('hidden');
  showToast(`Restart scheduled for ${new Date(dt).toLocaleString()}`, 'warning');
}

function showToast(message, type = 'success') {
  const toast = document.createElement('div');
  toast.className = `toast toast-${type}`;
  toast.textContent = message;
  document.getElementById('toast-container').appendChild(toast);
  setTimeout(() => toast.remove(), 3500);
}

document.addEventListener('DOMContentLoaded', init);