const express = require('express');
const multer = require('multer');
const path = require('path');
const fs = require('fs');
const sharp = require('sharp');
const router = express.Router();
const { getDb } = require('../models/db');
const { authMiddleware, adminMiddleware } = require('../middleware/auth');

// Generic icon storage factory
function makeIconStorage(prefix) {
  return multer.diskStorage({
    destination: '/app/uploads/logos',
    filename: (req, file, cb) => {
      const ext = path.extname(file.originalname);
      cb(null, `${prefix}_${Date.now()}${ext}`);
    }
  });
}

const iconUploadOpts = {
  limits: { fileSize: 1 * 1024 * 1024 },
  fileFilter: (req, file, cb) => {
    if (file.mimetype.startsWith('image/')) cb(null, true);
    else cb(new Error('Images only'));
  }
};

const uploadLogo     = multer({ storage: makeIconStorage('logo'),     ...iconUploadOpts });
const uploadNewChat  = multer({ storage: makeIconStorage('newchat'),  ...iconUploadOpts });
const uploadGroupInfo = multer({ storage: makeIconStorage('groupinfo'), ...iconUploadOpts });

// Get public settings (accessible by all)
router.get('/', (req, res) => {
  const db = getDb();
  const settings = db.prepare('SELECT key, value FROM settings').all();
  const obj = {};
  for (const s of settings) obj[s.key] = s.value;
  const admin = db.prepare('SELECT email FROM users WHERE is_default_admin = 1').get();
  if (admin) obj.admin_email = admin.email;
  // Expose app version from Docker build arg env var
  obj.app_version = process.env.JAMA_VERSION || process.env.TEAMCHAT_VERSION || 'dev';
  obj.user_pass = process.env.USER_PASS || 'user@1234';
  res.json({ settings: obj });
});

// Update app name (admin)
router.patch('/app-name', authMiddleware, adminMiddleware, (req, res) => {
  const { name } = req.body;
  if (!name?.trim()) return res.status(400).json({ error: 'Name required' });
  const db = getDb();
  db.prepare("UPDATE settings SET value = ?, updated_at = datetime('now') WHERE key = 'app_name'").run(name.trim());
  res.json({ success: true, name: name.trim() });
});

// Upload app logo (admin) — also generates 192x192 and 512x512 PWA icons
router.post('/logo', authMiddleware, adminMiddleware, uploadLogo.single('logo'), async (req, res) => {
  if (!req.file) return res.status(400).json({ error: 'No file' });

  const logoUrl = `/uploads/logos/${req.file.filename}`;
  const srcPath = req.file.path;

  try {
    // Generate PWA icons from the uploaded logo
    const icon192Path = '/app/uploads/logos/pwa-icon-192.png';
    const icon512Path = '/app/uploads/logos/pwa-icon-512.png';

    await sharp(srcPath)
      .resize(192, 192, { fit: 'contain', background: { r: 255, g: 255, b: 255, alpha: 0 } })
      .png()
      .toFile(icon192Path);

    await sharp(srcPath)
      .resize(512, 512, { fit: 'contain', background: { r: 255, g: 255, b: 255, alpha: 0 } })
      .png()
      .toFile(icon512Path);

    const db = getDb();
    db.prepare("UPDATE settings SET value = ?, updated_at = datetime('now') WHERE key = 'logo_url'").run(logoUrl);
    // Store the PWA icon paths so the manifest can reference them
    db.prepare("INSERT INTO settings (key, value) VALUES ('pwa_icon_192', ?) ON CONFLICT(key) DO UPDATE SET value = ?, updated_at = datetime('now')")
      .run('/uploads/logos/pwa-icon-192.png', '/uploads/logos/pwa-icon-192.png');
    db.prepare("INSERT INTO settings (key, value) VALUES ('pwa_icon_512', ?) ON CONFLICT(key) DO UPDATE SET value = ?, updated_at = datetime('now')")
      .run('/uploads/logos/pwa-icon-512.png', '/uploads/logos/pwa-icon-512.png');

    res.json({ logoUrl });
  } catch (err) {
    console.error('[Logo] Failed to generate PWA icons:', err.message);
    // Still save the logo even if icon generation fails
    const db = getDb();
    db.prepare("UPDATE settings SET value = ?, updated_at = datetime('now') WHERE key = 'logo_url'").run(logoUrl);
    res.json({ logoUrl });
  }
});

// Upload New Chat icon (admin)
router.post('/icon-newchat', authMiddleware, adminMiddleware, uploadNewChat.single('icon'), (req, res) => {
  if (!req.file) return res.status(400).json({ error: 'No file' });
  const iconUrl = `/uploads/logos/${req.file.filename}`;
  const db = getDb();
  db.prepare("INSERT INTO settings (key, value) VALUES ('icon_newchat', ?) ON CONFLICT(key) DO UPDATE SET value = ?, updated_at = datetime('now')")
    .run(iconUrl, iconUrl);
  res.json({ iconUrl });
});

// Upload Group Info icon (admin)
router.post('/icon-groupinfo', authMiddleware, adminMiddleware, uploadGroupInfo.single('icon'), (req, res) => {
  if (!req.file) return res.status(400).json({ error: 'No file' });
  const iconUrl = `/uploads/logos/${req.file.filename}`;
  const db = getDb();
  db.prepare("INSERT INTO settings (key, value) VALUES ('icon_groupinfo', ?) ON CONFLICT(key) DO UPDATE SET value = ?, updated_at = datetime('now')")
    .run(iconUrl, iconUrl);
  res.json({ iconUrl });
});

// Reset all settings to defaults (admin)
router.patch('/colors', authMiddleware, adminMiddleware, (req, res) => {
  const { colorTitle, colorTitleDark, colorAvatarPublic, colorAvatarDm } = req.body;
  const db = getDb();
  const upd = db.prepare("INSERT INTO settings (key, value) VALUES (?, ?) ON CONFLICT(key) DO UPDATE SET value = ?, updated_at = datetime('now')");
  if (colorTitle        !== undefined) upd.run('color_title',         colorTitle        || '', colorTitle        || '');
  if (colorTitleDark    !== undefined) upd.run('color_title_dark',    colorTitleDark    || '', colorTitleDark    || '');
  if (colorAvatarPublic !== undefined) upd.run('color_avatar_public', colorAvatarPublic || '', colorAvatarPublic || '');
  if (colorAvatarDm     !== undefined) upd.run('color_avatar_dm',    colorAvatarDm     || '', colorAvatarDm     || '');
  res.json({ success: true });
});

router.post('/reset', authMiddleware, adminMiddleware, (req, res) => {
  const db = getDb();
  const originalName = process.env.APP_NAME || 'jama';
  db.prepare("UPDATE settings SET value = ?, updated_at = datetime('now') WHERE key = 'app_name'").run(originalName);
  db.prepare("UPDATE settings SET value = '', updated_at = datetime('now') WHERE key = 'logo_url'").run();
  db.prepare("UPDATE settings SET value = '', updated_at = datetime('now') WHERE key IN ('icon_newchat', 'icon_groupinfo', 'pwa_icon_192', 'pwa_icon_512', 'color_title', 'color_title_dark', 'color_avatar_public', 'color_avatar_dm')").run();
  res.json({ success: true });
});

module.exports = router;