import Database from 'better-sqlite3';
import { mkdirSync, existsSync } from 'fs';
import { dirname } from 'path';

const DB_PATH = process.env.DB_PATH || './data/db/ofapp.db';

const dir = dirname(DB_PATH);
if (!existsSync(dir)) {
  mkdirSync(dir, { recursive: true });
}

const db = new Database(DB_PATH);

db.pragma('journal_mode = WAL');

db.exec(`
  CREATE TABLE IF NOT EXISTS auth_config (
    user_id TEXT,
    cookie TEXT,
    x_bc TEXT,
    app_token TEXT,
    x_of_rev TEXT,
    user_agent TEXT
  );

  CREATE TABLE IF NOT EXISTS download_history (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    user_id TEXT,
    post_id TEXT,
    media_id TEXT,
    media_type TEXT,
    filename TEXT,
    downloaded_at TEXT
  );

  CREATE TABLE IF NOT EXISTS download_cursors (
    user_id TEXT UNIQUE,
    cursor TEXT,
    posts_downloaded INTEGER
  );

  CREATE TABLE IF NOT EXISTS settings (
    key TEXT PRIMARY KEY,
    value TEXT
  );

  CREATE TABLE IF NOT EXISTS media_files (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    folder TEXT NOT NULL,
    filename TEXT NOT NULL,
    type TEXT NOT NULL,
    size INTEGER NOT NULL,
    modified REAL NOT NULL,
    posted_at TEXT,
    created_at TEXT DEFAULT (datetime('now')),
    UNIQUE(folder, filename)
  );

  CREATE INDEX IF NOT EXISTS idx_media_folder ON media_files(folder);
  CREATE INDEX IF NOT EXISTS idx_media_type ON media_files(type);
  CREATE INDEX IF NOT EXISTS idx_media_modified ON media_files(modified);
  CREATE INDEX IF NOT EXISTS idx_media_posted_at ON media_files(posted_at);

  CREATE TABLE IF NOT EXISTS auto_download_users (
    user_id TEXT PRIMARY KEY,
    username TEXT NOT NULL,
    enabled INTEGER DEFAULT 1,
    last_run TEXT,
    created_at TEXT DEFAULT (datetime('now'))
  );

  CREATE TABLE IF NOT EXISTS auto_scrape_jobs (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    type TEXT NOT NULL,
    url TEXT NOT NULL,
    folder_name TEXT NOT NULL,
    config TEXT NOT NULL,
    enabled INTEGER DEFAULT 1,
    last_run TEXT,
    created_at TEXT DEFAULT (datetime('now'))
  );

  CREATE TABLE IF NOT EXISTS app_users (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    username TEXT NOT NULL UNIQUE COLLATE NOCASE,
    password_hash TEXT NOT NULL,
    display_name TEXT DEFAULT '',
    role TEXT NOT NULL DEFAULT 'user',
    enabled INTEGER DEFAULT 1,
    created_at TEXT DEFAULT (datetime('now')),
    updated_at TEXT DEFAULT (datetime('now'))
  );

  CREATE TABLE IF NOT EXISTS user_folder_access (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    user_id INTEGER NOT NULL,
    folder TEXT NOT NULL,
    UNIQUE(user_id, folder),
    FOREIGN KEY (user_id) REFERENCES app_users(id) ON DELETE CASCADE
  );

  CREATE TABLE IF NOT EXISTS user_route_access (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    user_id INTEGER NOT NULL,
    route_key TEXT NOT NULL,
    UNIQUE(user_id, route_key),
    FOREIGN KEY (user_id) REFERENCES app_users(id) ON DELETE CASCADE
  );

  CREATE INDEX IF NOT EXISTS idx_user_folder_user ON user_folder_access(user_id);
  CREATE INDEX IF NOT EXISTS idx_user_route_user ON user_route_access(user_id);

  CREATE TABLE IF NOT EXISTS forum_sites (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    name TEXT NOT NULL,
    base_url TEXT DEFAULT '',
    cookies TEXT DEFAULT '',
    created_at TEXT DEFAULT (datetime('now')),
    updated_at TEXT DEFAULT (datetime('now'))
  );
`);

// Migration: add posted_at column if missing
const cols = db.prepare("PRAGMA table_info(download_history)").all().map((c) => c.name);
if (!cols.includes('posted_at')) {
  db.exec('ALTER TABLE download_history ADD COLUMN posted_at TEXT');
}

// Migration: add username, password, cookie_expires_at columns to forum_sites
const forumCols = db.prepare("PRAGMA table_info(forum_sites)").all().map((c) => c.name);
if (!forumCols.includes('username')) {
  db.exec("ALTER TABLE forum_sites ADD COLUMN username TEXT DEFAULT ''");
}
if (!forumCols.includes('password')) {
  db.exec("ALTER TABLE forum_sites ADD COLUMN password TEXT DEFAULT ''");
}
if (!forumCols.includes('cookie_expires_at')) {
  db.exec('ALTER TABLE forum_sites ADD COLUMN cookie_expires_at TEXT');
}
if (!forumCols.includes('user_agent')) {
  db.exec("ALTER TABLE forum_sites ADD COLUMN user_agent TEXT DEFAULT ''");
}

export function getAuthConfig() {
  const row = db.prepare('SELECT * FROM auth_config LIMIT 1').get();
  return row || null;
}

export function saveAuthConfig(config) {
  const del = db.prepare('DELETE FROM auth_config');
  const ins = db.prepare(
    'INSERT INTO auth_config (user_id, cookie, x_bc, app_token, x_of_rev, user_agent) VALUES (?, ?, ?, ?, ?, ?)'
  );

  const upsert = db.transaction((c) => {
    del.run();
    ins.run(c.user_id, c.cookie, c.x_bc, c.app_token, c.x_of_rev, c.user_agent);
  });

  upsert(config);
}

export function isMediaDownloaded(mediaId) {
  const row = db.prepare('SELECT 1 FROM download_history WHERE media_id = ? LIMIT 1').get(String(mediaId));
  return !!row;
}

export function recordDownload(userId, postId, mediaId, mediaType, filename, postedAt) {
  db.prepare(
    'INSERT INTO download_history (user_id, post_id, media_id, media_type, filename, downloaded_at, posted_at) VALUES (?, ?, ?, ?, ?, ?, ?)'
  ).run(String(userId), String(postId), String(mediaId), mediaType, filename, new Date().toISOString(), postedAt || null);
}

export function getDownloadHistory(userId) {
  return db.prepare('SELECT * FROM download_history WHERE user_id = ? ORDER BY downloaded_at DESC').all(String(userId));
}

export function saveCursor(userId, cursor, postsDownloaded) {
  db.prepare(
    'INSERT INTO download_cursors (user_id, cursor, posts_downloaded) VALUES (?, ?, ?) ON CONFLICT(user_id) DO UPDATE SET cursor = excluded.cursor, posts_downloaded = excluded.posts_downloaded'
  ).run(String(userId), cursor, postsDownloaded);
}

export function getCursor(userId) {
  return db.prepare('SELECT cursor, posts_downloaded FROM download_cursors WHERE user_id = ?').get(String(userId)) || null;
}

export function clearCursor(userId) {
  db.prepare('DELETE FROM download_cursors WHERE user_id = ?').run(String(userId));
}

export function getPostDateByFilename(filename) {
  const row = db.prepare('SELECT posted_at FROM download_history WHERE filename = ? LIMIT 1').get(filename);
  return row?.posted_at || null;
}

export function getSetting(key) {
  const row = db.prepare('SELECT value FROM settings WHERE key = ?').get(key);
  return row ? row.value : null;
}

export function setSetting(key, value) {
  db.prepare(
    'INSERT INTO settings (key, value) VALUES (?, ?) ON CONFLICT(key) DO UPDATE SET value = excluded.value'
  ).run(key, value);
}

export function getAllSettings() {
  const rows = db.prepare('SELECT key, value FROM settings').all();
  const obj = {};
  for (const row of rows) obj[row.key] = row.value;
  return obj;
}

export function getDownloadStats() {
  return db.prepare(
    'SELECT user_id, COUNT(*) as file_count, MAX(downloaded_at) as last_download FROM download_history GROUP BY user_id'
  ).all();
}

// --- media_files helpers ---

const upsertMediaStmt = db.prepare(`
  INSERT INTO media_files (folder, filename, type, size, modified, posted_at)
  VALUES (?, ?, ?, ?, ?, ?)
  ON CONFLICT(folder, filename) DO UPDATE SET
    size = excluded.size,
    modified = excluded.modified,
    posted_at = COALESCE(excluded.posted_at, media_files.posted_at)
`);

export function upsertMediaFile(folder, filename, type, size, modified, postedAt) {
  upsertMediaStmt.run(folder, filename, type, size, modified, postedAt || null);
}

export const upsertMediaFileBatch = db.transaction((files) => {
  for (const f of files) {
    upsertMediaStmt.run(f.folder, f.filename, f.type, f.size, f.modified, f.postedAt || null);
  }
});

export function removeMediaFile(folder, filename) {
  db.prepare('DELETE FROM media_files WHERE folder = ? AND filename = ?').run(folder, filename);
}

export function getMediaFolders() {
  return db.prepare(`
    SELECT folder AS name,
           COUNT(*) AS total,
           SUM(CASE WHEN type = 'image' THEN 1 ELSE 0 END) AS images,
           SUM(CASE WHEN type = 'video' THEN 1 ELSE 0 END) AS videos
    FROM media_files
    WHERE folder NOT LIKE '\\_%' ESCAPE '\\'
    GROUP BY folder
    ORDER BY folder
  `).all();
}

export function getMediaFiles({ folder, folders, type, sort, offset, limit, dateFrom, dateTo, minSize, maxSize, search }) {
  const conditions = [];
  const params = [];

  // Always exclude folders starting with _
  conditions.push("folder NOT LIKE '\\_%' ESCAPE '\\'");

  if (folder) {
    conditions.push('folder = ?');
    params.push(folder);
  } else if (folders && folders.length > 0) {
    conditions.push(`folder IN (${folders.map(() => '?').join(',')})`);
    params.push(...folders);
  }

  if (type && type !== 'all') {
    conditions.push('type = ?');
    params.push(type);
  }

  if (dateFrom) {
    conditions.push("COALESCE(posted_at, datetime(modified / 1000, 'unixepoch')) >= ?");
    params.push(dateFrom);
  }
  if (dateTo) {
    conditions.push("COALESCE(posted_at, datetime(modified / 1000, 'unixepoch')) <= ?");
    params.push(dateTo + 'T23:59:59');
  }
  if (minSize) {
    conditions.push('size >= ?');
    params.push(parseInt(minSize, 10));
  }
  if (maxSize) {
    conditions.push('size <= ?');
    params.push(parseInt(maxSize, 10));
  }
  if (search) {
    conditions.push('(filename LIKE ? OR folder LIKE ?)');
    params.push(`%${search}%`, `%${search}%`);
  }

  const where = conditions.length > 0 ? `WHERE ${conditions.join(' AND ')}` : '';

  const countRow = db.prepare(`SELECT COUNT(*) AS total FROM media_files ${where}`).get(...params);
  const total = countRow.total;

  const effectiveLimit = limit || 50;
  const effectiveOffset = offset || 0;

  // Equal-mix shuffle: when shuffling with multiple folders, sample equally from each
  if (sort === 'shuffle') {
    // Count distinct folders in the result set
    const folderCountRow = db.prepare(
      `SELECT COUNT(DISTINCT folder) AS cnt FROM media_files ${where}`
    ).get(...params);
    const numFolders = folderCountRow?.cnt || 1;

    if (numFolders > 1) {
      // Use ROW_NUMBER to pick equal random samples per folder
      const perFolder = Math.ceil(effectiveLimit / numFolders);
      const rows = db.prepare(`
        WITH ranked AS (
          SELECT folder, filename, type, size, modified, posted_at,
                 ROW_NUMBER() OVER (PARTITION BY folder ORDER BY RANDOM()) AS rn
          FROM media_files
          ${where}
        )
        SELECT folder, filename, type, size, modified, posted_at
        FROM ranked
        WHERE rn <= ?
        ORDER BY RANDOM()
        LIMIT ? OFFSET ?
      `).all(...params, perFolder, effectiveLimit, effectiveOffset);
      return { total, rows };
    }

    // Single folder or no folder filter — plain random
    const rows = db.prepare(`
      SELECT folder, filename, type, size, modified, posted_at
      FROM media_files
      ${where}
      ORDER BY RANDOM()
      LIMIT ? OFFSET ?
    `).all(...params, effectiveLimit, effectiveOffset);
    return { total, rows };
  }

  let orderBy;
  switch (sort) {
    case 'oldest':
      orderBy = "ORDER BY COALESCE(posted_at, datetime(modified / 1000, 'unixepoch')) ASC";
      break;
    case 'largest':
      orderBy = 'ORDER BY size DESC';
      break;
    case 'smallest':
      orderBy = 'ORDER BY size ASC';
      break;
    case 'name':
      orderBy = 'ORDER BY filename ASC';
      break;
    default:
      orderBy = "ORDER BY COALESCE(posted_at, datetime(modified / 1000, 'unixepoch')) DESC";
  }

  const rows = db.prepare(`
    SELECT folder, filename, type, size, modified, posted_at
    FROM media_files
    ${where}
    ${orderBy}
    LIMIT ? OFFSET ?
  `).all(...params, effectiveLimit, effectiveOffset);

  return { total, rows };
}

export function getAllIndexedFolders() {
  return db.prepare('SELECT DISTINCT folder FROM media_files').all().map(r => r.folder);
}

export function removeStaleFiles(folder, existingFilenames) {
  const rows = db.prepare('SELECT filename FROM media_files WHERE folder = ?').all(folder);
  const existing = new Set(existingFilenames);
  const toDelete = rows.filter(r => !existing.has(r.filename));
  if (toDelete.length > 0) {
    const del = db.prepare('DELETE FROM media_files WHERE folder = ? AND filename = ?');
    const batch = db.transaction((files) => {
      for (const f of files) del.run(folder, f.filename);
    });
    batch(toDelete);
  }
  return toDelete.length;
}

export function getMediaFileCount() {
  return db.prepare('SELECT COUNT(*) AS count FROM media_files').get().count;
}

export function getNewMediaCount(since) {
  return db.prepare('SELECT COUNT(*) AS count FROM media_files WHERE created_at > ?').get(since).count;
}

// --- auto_download_users helpers ---

export function getAutoDownloadUsers() {
  return db.prepare('SELECT * FROM auto_download_users WHERE enabled = 1').all();
}

export function addAutoDownloadUser(userId, username) {
  db.prepare(
    'INSERT INTO auto_download_users (user_id, username) VALUES (?, ?) ON CONFLICT(user_id) DO UPDATE SET username = excluded.username, enabled = 1'
  ).run(String(userId), username);
}

export function removeAutoDownloadUser(userId) {
  db.prepare('DELETE FROM auto_download_users WHERE user_id = ?').run(String(userId));
}

export function isAutoDownloadUser(userId) {
  return !!db.prepare('SELECT 1 FROM auto_download_users WHERE user_id = ? AND enabled = 1').get(String(userId));
}

export function updateAutoDownloadLastRun(userId) {
  db.prepare('UPDATE auto_download_users SET last_run = datetime(\'now\') WHERE user_id = ?').run(String(userId));
}

// --- auto_scrape_jobs helpers ---

export function getAutoScrapeJobs() {
  return db.prepare('SELECT * FROM auto_scrape_jobs WHERE enabled = 1').all();
}

export function addAutoScrapeJob(type, url, folderName, config) {
  db.prepare(
    'INSERT INTO auto_scrape_jobs (type, url, folder_name, config) VALUES (?, ?, ?, ?)'
  ).run(type, url, folderName, JSON.stringify(config));
}

export function removeAutoScrapeJob(id) {
  db.prepare('DELETE FROM auto_scrape_jobs WHERE id = ?').run(id);
}

export function updateAutoScrapeLastRun(id) {
  db.prepare('UPDATE auto_scrape_jobs SET last_run = datetime(\'now\') WHERE id = ?').run(id);
}

// --- Dashboard / stats helpers ---

export function getStorageStats() {
  return db.prepare(`
    SELECT folder,
           COUNT(*) AS file_count,
           SUM(size) AS total_size,
           SUM(CASE WHEN type = 'image' THEN 1 ELSE 0 END) AS images,
           SUM(CASE WHEN type = 'video' THEN 1 ELSE 0 END) AS videos
    FROM media_files
    GROUP BY folder
    ORDER BY SUM(size) DESC
  `).all();
}

export function getTotalStorageSize() {
  const row = db.prepare('SELECT SUM(size) AS total FROM media_files').get();
  return row?.total || 0;
}

// --- videos tables ---

db.exec(`
  CREATE TABLE IF NOT EXISTS videos (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    title TEXT NOT NULL,
    description TEXT DEFAULT '',
    filename TEXT NOT NULL,
    file_path TEXT NOT NULL,
    file_size INTEGER NOT NULL DEFAULT 0,
    duration REAL,
    width INTEGER,
    height INTEGER,
    fps REAL,
    codec TEXT,
    bitrate INTEGER,
    has_audio INTEGER DEFAULT 1,
    thumbnail_path TEXT,
    status TEXT DEFAULT 'pending',
    error_message TEXT,
    created_at TEXT DEFAULT (datetime('now')),
    updated_at TEXT DEFAULT (datetime('now')),
    UNIQUE(file_path)
  );

  CREATE TABLE IF NOT EXISTS tags (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    name TEXT NOT NULL UNIQUE COLLATE NOCASE,
    created_at TEXT DEFAULT (datetime('now'))
  );

  CREATE TABLE IF NOT EXISTS video_tags (
    video_id INTEGER NOT NULL,
    tag_id INTEGER NOT NULL,
    PRIMARY KEY (video_id, tag_id),
    FOREIGN KEY (video_id) REFERENCES videos(id) ON DELETE CASCADE,
    FOREIGN KEY (tag_id) REFERENCES tags(id) ON DELETE CASCADE
  );
`);

// --- video helpers ---

export function insertVideo(data) {
  const stmt = db.prepare(`
    INSERT INTO videos (title, description, filename, file_path, file_size, duration, width, height, fps, codec, bitrate, has_audio, thumbnail_path, status, error_message)
    VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
  `);
  const result = stmt.run(
    data.title, data.description || '', data.filename, data.file_path, data.file_size || 0,
    data.duration || null, data.width || null, data.height || null, data.fps || null,
    data.codec || null, data.bitrate || null, data.has_audio ?? 1,
    data.thumbnail_path || null, data.status || 'pending', data.error_message || null
  );
  return result.lastInsertRowid;
}

export function getVideoById(id) {
  return db.prepare('SELECT * FROM videos WHERE id = ?').get(id) || null;
}

export function getVideoByPath(filePath) {
  return db.prepare('SELECT * FROM videos WHERE file_path = ?').get(filePath) || null;
}

export function updateVideo(id, data) {
  const fields = [];
  const values = [];
  for (const [key, val] of Object.entries(data)) {
    if (key === 'id') continue;
    fields.push(`${key} = ?`);
    values.push(val);
  }
  if (fields.length === 0) return;
  fields.push("updated_at = datetime('now')");
  values.push(id);
  db.prepare(`UPDATE videos SET ${fields.join(', ')} WHERE id = ?`).run(...values);
}

export function deleteVideoById(id) {
  db.prepare('DELETE FROM video_tags WHERE video_id = ?').run(id);
  db.prepare('DELETE FROM videos WHERE id = ?').run(id);
}

export function searchVideos({ search, tags, minDuration, maxDuration, minWidth, sort, offset, limit }) {
  const conditions = [];
  const params = [];

  if (search) {
    conditions.push('(v.title LIKE ? OR v.description LIKE ? OR v.filename LIKE ?)');
    params.push(`%${search}%`, `%${search}%`, `%${search}%`);
  }
  if (minDuration) {
    conditions.push('v.duration >= ?');
    params.push(parseFloat(minDuration));
  }
  if (maxDuration) {
    conditions.push('v.duration <= ?');
    params.push(parseFloat(maxDuration));
  }
  if (minWidth) {
    conditions.push('v.width >= ?');
    params.push(parseInt(minWidth, 10));
  }
  if (tags && tags.length > 0) {
    conditions.push(`v.id IN (
      SELECT vt.video_id FROM video_tags vt
      JOIN tags t ON t.id = vt.tag_id
      WHERE t.name IN (${tags.map(() => '?').join(',')})
    )`);
    params.push(...tags);
  }

  conditions.push("v.status = 'ready'");
  const where = conditions.length > 0 ? `WHERE ${conditions.join(' AND ')}` : '';

  const countRow = db.prepare(`SELECT COUNT(*) AS total FROM videos v ${where}`).get(...params);
  const total = countRow.total;

  let orderBy;
  switch (sort) {
    case 'oldest': orderBy = 'ORDER BY v.created_at ASC'; break;
    case 'longest': orderBy = 'ORDER BY v.duration DESC'; break;
    case 'shortest': orderBy = 'ORDER BY v.duration ASC'; break;
    case 'largest': orderBy = 'ORDER BY v.file_size DESC'; break;
    case 'title': orderBy = 'ORDER BY v.title ASC'; break;
    case 'shuffle': orderBy = 'ORDER BY RANDOM()'; break;
    default: orderBy = 'ORDER BY v.created_at DESC';
  }

  const effectiveLimit = limit || 48;
  const effectiveOffset = offset || 0;

  const rows = db.prepare(`
    SELECT v.* FROM videos v ${where} ${orderBy} LIMIT ? OFFSET ?
  `).all(...params, effectiveLimit, effectiveOffset);

  return { total, rows };
}

export function getOrCreateTag(name) {
  const trimmed = name.trim();
  if (!trimmed) return null;
  let row = db.prepare('SELECT id FROM tags WHERE name = ? COLLATE NOCASE').get(trimmed);
  if (!row) {
    const result = db.prepare('INSERT INTO tags (name) VALUES (?)').run(trimmed);
    return result.lastInsertRowid;
  }
  return row.id;
}

export function getAllTags(search) {
  if (search) {
    return db.prepare(`
      SELECT t.id, t.name, COUNT(vt.video_id) AS count
      FROM tags t
      LEFT JOIN video_tags vt ON vt.tag_id = t.id
      WHERE t.name LIKE ?
      GROUP BY t.id
      ORDER BY count DESC, t.name ASC
    `).all(`%${search}%`);
  }
  return db.prepare(`
    SELECT t.id, t.name, COUNT(vt.video_id) AS count
    FROM tags t
    LEFT JOIN video_tags vt ON vt.tag_id = t.id
    GROUP BY t.id
    ORDER BY count DESC, t.name ASC
  `).all();
}

export function setVideoTags(videoId, tagNames) {
  const setTags = db.transaction((names) => {
    db.prepare('DELETE FROM video_tags WHERE video_id = ?').run(videoId);
    for (const name of names) {
      const tagId = getOrCreateTag(name);
      if (tagId) {
        db.prepare('INSERT OR IGNORE INTO video_tags (video_id, tag_id) VALUES (?, ?)').run(videoId, tagId);
      }
    }
  });
  setTags(tagNames);
}

export function getVideoTags(videoId) {
  return db.prepare(`
    SELECT t.id, t.name FROM tags t
    JOIN video_tags vt ON vt.tag_id = t.id
    WHERE vt.video_id = ?
    ORDER BY t.name ASC
  `).all(videoId);
}

export function getDownloadsToday() {
  // created_at is stored in UTC via SQLite datetime('now').
  // Compute local midnight in UTC-relative format so "today" matches the server's local day.
  const now = new Date();
  const localMidnight = new Date(now.getFullYear(), now.getMonth(), now.getDate());
  // Format as SQLite-compatible "YYYY-MM-DD HH:MM:SS"
  const y = localMidnight.getUTCFullYear();
  const mo = String(localMidnight.getUTCMonth() + 1).padStart(2, '0');
  const d = String(localMidnight.getUTCDate()).padStart(2, '0');
  const h = String(localMidnight.getUTCHours()).padStart(2, '0');
  const mi = String(localMidnight.getUTCMinutes()).padStart(2, '0');
  const s = String(localMidnight.getUTCSeconds()).padStart(2, '0');
  const todayUtc = `${y}-${mo}-${d} ${h}:${mi}:${s}`;
  const row = db.prepare('SELECT COUNT(*) AS count FROM media_files WHERE created_at >= ?').get(todayUtc);
  return row?.count || 0;
}

export function getRecentDownloads(limit = 10) {
  // Merge recent items from both download_history and media_files (for scrapes)
  return db.prepare(`
    SELECT filename, type AS media_type, folder AS user_id, created_at AS downloaded_at
    FROM media_files
    ORDER BY created_at DESC
    LIMIT ?
  `).all(limit);
}

// --- app_users helpers ---

export function createAppUser(username, passwordHash, role = 'user', displayName = '') {
  const result = db.prepare(
    'INSERT INTO app_users (username, password_hash, role, display_name) VALUES (?, ?, ?, ?)'
  ).run(username, passwordHash, role, displayName);
  return result.lastInsertRowid;
}

export function getAppUserByUsername(username) {
  return db.prepare('SELECT * FROM app_users WHERE username = ?').get(username) || null;
}

export function getAppUserById(id) {
  return db.prepare('SELECT * FROM app_users WHERE id = ?').get(id) || null;
}

export function getAllAppUsers() {
  return db.prepare('SELECT id, username, display_name, role, enabled, created_at, updated_at FROM app_users ORDER BY id').all();
}

export function updateAppUser(id, fields) {
  const allowed = ['username', 'password_hash', 'display_name', 'role', 'enabled'];
  const sets = [];
  const values = [];
  for (const [key, val] of Object.entries(fields)) {
    if (!allowed.includes(key)) continue;
    sets.push(`${key} = ?`);
    values.push(val);
  }
  if (sets.length === 0) return;
  sets.push("updated_at = datetime('now')");
  values.push(id);
  db.prepare(`UPDATE app_users SET ${sets.join(', ')} WHERE id = ?`).run(...values);
}

export function deleteAppUser(id) {
  db.prepare('DELETE FROM app_users WHERE id = ?').run(id);
}

export function getAppUserCount() {
  return db.prepare('SELECT COUNT(*) AS count FROM app_users').get().count;
}

export function getUserFolderAccess(userId) {
  return db.prepare('SELECT folder FROM user_folder_access WHERE user_id = ?').all(userId).map(r => r.folder);
}

export function setUserFolderAccess(userId, folders) {
  const update = db.transaction((flds) => {
    db.prepare('DELETE FROM user_folder_access WHERE user_id = ?').run(userId);
    const ins = db.prepare('INSERT INTO user_folder_access (user_id, folder) VALUES (?, ?)');
    for (const f of flds) {
      ins.run(userId, f);
    }
  });
  update(folders);
}

export function getUserRouteAccess(userId) {
  return db.prepare('SELECT route_key FROM user_route_access WHERE user_id = ?').all(userId).map(r => r.route_key);
}

export function setUserRouteAccess(userId, routes) {
  const update = db.transaction((rts) => {
    db.prepare('DELETE FROM user_route_access WHERE user_id = ?').run(userId);
    const ins = db.prepare('INSERT INTO user_route_access (user_id, route_key) VALUES (?, ?)');
    for (const r of rts) {
      ins.run(userId, r);
    }
  });
  update(routes);
}

// --- Forum Sites ---

export function getForumSites() {
  return db.prepare('SELECT * FROM forum_sites ORDER BY name').all();
}

export function getForumSiteById(id) {
  return db.prepare('SELECT * FROM forum_sites WHERE id = ?').get(id);
}

export function createForumSite(name, baseUrl, cookies, username, password) {
  const result = db.prepare('INSERT INTO forum_sites (name, base_url, cookies, username, password) VALUES (?, ?, ?, ?, ?)').run(name, baseUrl || '', cookies || '', username || '', password || '');
  return result.lastInsertRowid;
}

export function updateForumSite(id, fields) {
  const allowed = ['name', 'base_url', 'cookies', 'username', 'password', 'cookie_expires_at', 'user_agent'];
  const sets = [];
  const vals = [];
  for (const [k, v] of Object.entries(fields)) {
    if (allowed.includes(k)) {
      sets.push(`${k} = ?`);
      vals.push(v);
    }
  }
  if (sets.length === 0) return;
  sets.push("updated_at = datetime('now')");
  vals.push(id);
  db.prepare(`UPDATE forum_sites SET ${sets.join(', ')} WHERE id = ?`).run(...vals);
}

export function deleteForumSite(id) {
  db.prepare('DELETE FROM forum_sites WHERE id = ?').run(id);
}