async function request(url, options = {}) {
  try {
    const response = await fetch(url, options);

    // Handle 401 — redirect to login (skip for auth endpoints)
    if (response.status === 401 && !url.startsWith('/api/app-auth/')) {
      window.location.href = '/login';
      return { error: 'Authentication required' };
    }

    const data = await response.json();

    if (!response.ok) {
      let errMsg = data.error || data.message || `Request failed with status ${response.status}`;
      if (typeof errMsg === 'object') errMsg = errMsg.message || errMsg.error || JSON.stringify(errMsg);
      return { error: String(errMsg) };
    }

    // OF API sometimes returns 200 with error body like {code, message} instead of proper HTTP error
    if (data && typeof data.code !== 'undefined' && !data.id) {
      return { error: data.message || 'Request failed' };
    }

    return data;
  } catch (err) {
    return { error: err.message || 'Network error' };
  }
}

function buildQuery(params) {
  const query = new URLSearchParams();
  for (const [key, value] of Object.entries(params)) {
    if (value !== undefined && value !== null && value !== '') {
      query.set(key, value);
    }
  }
  const str = query.toString();
  return str ? `?${str}` : '';
}

export function getMe() {
  return request('/api/me');
}

export function getFeed(beforePublishTime) {
  const query = buildQuery({ beforePublishTime });
  return request(`/api/feed${query}`);
}

export function getSubscriptions(offset) {
  const query = buildQuery({ offset });
  return request(`/api/subscriptions${query}`);
}

export function getUserPosts(userId, beforePublishTime) {
  const query = buildQuery({ beforePublishTime });
  return request(`/api/users/${userId}/posts${query}`);
}

export function getUser(username) {
  return request(`/api/users/${username}`);
}

export function saveAuth(config) {
  return request('/api/auth', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(config),
  });
}

export function getAuth() {
  return request('/api/auth');
}

export function startDownload(userId, limit, resume, username) {
  const body = {};
  if (limit) body.limit = limit;
  if (resume) body.resume = true;
  if (username) body.username = username;
  return request(`/api/download/${userId}`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(body),
  });
}

export function downloadPost(userId, username, postId, media, postedAt) {
  return request('/api/download/post', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ userId, username, postId, media, postedAt }),
  });
}

export function getDownloadStatus(userId) {
  return request(`/api/download/${userId}/status`);
}

export function getActiveDownloads() {
  return request('/api/download/active');
}

export function getDownloadCursor(userId) {
  return request(`/api/download/${userId}/cursor`);
}

export function getDownloadHistory() {
  return request('/api/download/history');
}

export function getGalleryFolders() {
  return request('/api/gallery/folders');
}

export function getSettings() {
  return request('/api/settings');
}

export function updateSettings(settings) {
  return request('/api/settings', {
    method: 'PUT',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(settings),
  });
}

export function getGalleryFiles({ folder, folders, type, sort, offset, limit, dateFrom, dateTo, minSize, maxSize, search } = {}) {
  const query = buildQuery({ folder, folders: folders ? folders.join(',') : undefined, type, sort, offset, limit, dateFrom, dateTo, minSize, maxSize, search });
  return request(`/api/gallery/files${query}`);
}

export function rescanMedia() {
  return request('/api/gallery/rescan', { method: 'POST' });
}

export function getRescanStatus() {
  return request('/api/gallery/rescan/status');
}

export function generateThumbs() {
  return request('/api/gallery/generate-thumbs', { method: 'POST' });
}

export function getThumbsStatus() {
  return request('/api/gallery/generate-thumbs/status');
}

export function scanDuplicates(mode = 'everywhere') {
  return request(`/api/gallery/scan-duplicates?mode=${mode}`, { method: 'POST' });
}

export function getDuplicateScanStatus() {
  return request('/api/gallery/scan-duplicates/status');
}

export function getDuplicateGroups(offset = 0, limit = 20) {
  const query = buildQuery({ offset, limit });
  return request(`/api/gallery/duplicates${query}`);
}

export function cleanDuplicates() {
  return request('/api/gallery/duplicates/clean', { method: 'POST' });
}

export function deleteMediaFile(folder, filename) {
  return request(`/api/gallery/media/${encodeURIComponent(folder)}/${encodeURIComponent(filename)}`, { method: 'DELETE' });
}

export function getNewMediaCount() {
  return request('/api/gallery/new-count');
}

export function markGallerySeen() {
  return request('/api/settings', {
    method: 'PUT',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ gallery_last_seen: new Date().toISOString() }),
  });
}

export function startForumScrape(config) {
  return request('/api/scrape/forum', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(config),
  });
}

export function startCoomerScrape(config) {
  return request('/api/scrape/coomer', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(config),
  });
}

export function startMediaLinkScrape(config) {
  return request('/api/scrape/medialink', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(config),
  });
}

export function startMegaScrape(config) {
  return request('/api/scrape/mega', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(config),
  });
}

export function startLeakGalleryScrape(config) {
  return request('/api/scrape/leakgallery', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(config),
  });
}

export function startYtdlpScrape(config) {
  return request('/api/scrape/ytdlp', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(config),
  });
}

export function getScrapeJobs() {
  return request('/api/scrape/jobs');
}

export function getScrapeJob(jobId) {
  return request(`/api/scrape/jobs/${jobId}`);
}

export function cancelScrapeJob(jobId) {
  return request(`/api/scrape/jobs/${jobId}/cancel`, { method: 'POST' });
}

export function detectForumPages(url, cookies) {
  return request('/api/scrape/forum/detect-pages', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ url, cookies }),
  });
}

// --- FlareSolverr ---

export function getFlareSolverrStatus() {
  return request('/api/flaresolverr/status');
}

export function refreshForumCookies(siteId) {
  return request(`/api/flaresolverr/refresh/${siteId}`, { method: 'POST' });
}

// --- Forum Sites ---

export function getForumSites() {
  return request('/api/scrape/forum-sites');
}

export function createForumSite(data) {
  return request('/api/scrape/forum-sites', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(data),
  });
}

export function updateForumSite(id, data) {
  return request(`/api/scrape/forum-sites/${id}`, {
    method: 'PUT',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(data),
  });
}

export function deleteForumSite(id) {
  return request(`/api/scrape/forum-sites/${id}`, { method: 'DELETE' });
}

// --- Auto-download ---

export function getAutoDownloadUsers() {
  return request('/api/download/auto');
}

export function addAutoDownloadUser(userId, username) {
  return request(`/api/download/auto/${userId}`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ username }),
  });
}

export function removeAutoDownloadUser(userId) {
  return request(`/api/download/auto/${userId}`, { method: 'DELETE' });
}

// --- Auto-scrape ---

export function getAutoScrapeJobs() {
  return request('/api/scrape/auto');
}

export function addAutoScrapeJob(config) {
  return request('/api/scrape/auto', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(config),
  });
}

export function removeAutoScrapeJob(id) {
  return request(`/api/scrape/auto/${id}`, { method: 'DELETE' });
}

// --- Dashboard / Health ---

export function checkAuth() {
  return request('/api/auth/check');
}

export function getDashboard() {
  return request('/api/dashboard');
}

export function getHealth() {
  return request('/api/health');
}

export function getActiveDownloadDetails() {
  return request('/api/download/active/details');
}

// --- Videos ---

export function getVideos({ search, tags, minDuration, maxDuration, minWidth, sort, offset, limit } = {}) {
  const query = buildQuery({
    search, tags: tags ? tags.join(',') : undefined,
    minDuration, maxDuration, minWidth, sort, offset, limit,
  });
  return request(`/api/videos${query}`);
}

export function getVideo(id) {
  return request(`/api/videos/${id}`);
}

export function updateVideoMeta(id, data) {
  return request(`/api/videos/${id}`, {
    method: 'PUT',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(data),
  });
}

export function deleteVideo(id) {
  return request(`/api/videos/${id}`, { method: 'DELETE' });
}

export function uploadVideo(file, onProgress) {
  return new Promise((resolve, reject) => {
    const xhr = new XMLHttpRequest();
    xhr.open('POST', '/api/videos/upload');

    if (onProgress) {
      xhr.upload.onprogress = (e) => {
        if (e.lengthComputable) onProgress(e.loaded / e.total);
      };
    }

    xhr.onload = () => {
      try {
        const data = JSON.parse(xhr.responseText);
        resolve(data);
      } catch {
        reject(new Error('Invalid response'));
      }
    };

    xhr.onerror = () => reject(new Error('Upload failed'));

    const formData = new FormData();
    formData.append('video', file);
    xhr.send(formData);
  });
}

export function scanVideos() {
  return request('/api/videos/scan', { method: 'POST' });
}

export function getVideoScanStatus() {
  return request('/api/videos/scan/status');
}

export function getVideoTags(search) {
  const query = buildQuery({ search });
  return request(`/api/videos/tags${query}`);
}

// --- App Auth ---

export function appAuthStatus() {
  return request('/api/app-auth/status');
}

export function appAuthLogin(username, password) {
  return request('/api/app-auth/login', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ username, password }),
  });
}

export function appAuthLogout() {
  return request('/api/app-auth/logout', { method: 'POST' });
}

export function appAuthMe() {
  return request('/api/app-auth/me');
}

export function appAuthSetup(username, password) {
  return request('/api/app-auth/setup', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ username, password }),
  });
}

// --- Admin User Management ---

export function getAppUsers() {
  return request('/api/admin/users');
}

export function createAppUser(data) {
  return request('/api/admin/users', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(data),
  });
}

export function updateAppUser(id, data) {
  return request(`/api/admin/users/${id}`, {
    method: 'PUT',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(data),
  });
}

export function deleteAppUser(id) {
  return request(`/api/admin/users/${id}`, { method: 'DELETE' });
}

export function getAvailableFolders() {
  return request('/api/admin/available-folders');
}