import { createClient } from '@supabase/supabase-js';

const FB_SOURCE = 'files';

function normalizePath(path) {
  const raw = String(path || '/').trim();
  const parts = raw.split('/').filter(Boolean);
  const clean = [];
  for (const part of parts) {
    if (part === '.') continue;
    if (part === '..') throw new Error('Invalid path');
    clean.push(part);
  }
  return `/${clean.join('/')}`;
}

function joinPath(...parts) {
  return normalizePath(parts.join('/'));
}

function safeName(value) {
  return String(value || '')
    .trim()
    .replace(/[\\/:*?"<>|#%{}^~[\]`]+/g, '-')
    .replace(/\s+/g, ' ')
    .replace(/^-+|-+$/g, '');
}

function getConfig() {
  const url = String(process.env.FILEBROWSER_URL || '').trim().replace(/\/+$/, '');
  return {
    url,
    token: process.env.FILEBROWSER_TOKEN || '',
    clientRoot: normalizePath(process.env.FILEBROWSER_CLIENT_ROOT || '/fourgebranding/Clients'),
    configured: Boolean(url),
  };
}

async function fbFetch(config, method, endpoint, { params = {}, headers = {}, body } = {}) {
  const qs = new URLSearchParams({ source: FB_SOURCE, ...params }).toString();
  const res = await fetch(`${config.url}${endpoint}?${qs}`, {
    method,
    headers: { Authorization: `Bearer ${config.token}`, ...headers },
    body,
  });
  if (!res.ok) {
    const text = await res.text();
    const err = new Error(text || `FileBrowser ${res.status}`);
    err.status = res.status;
    throw err;
  }
}

async function mkdir(config, path) {
  await fbFetch(config, 'POST', '/api/resources', {
    params: { path, isDir: 'true' },
  }).catch(() => {});
}

async function renameFolder(config, fromPath, toPath) {
  await fbFetch(config, 'PATCH', '/api/resources', {
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({
      action: 'rename',
      items: [{ fromSource: FB_SOURCE, fromPath, toSource: FB_SOURCE, toPath }],
      overwrite: false,
    }),
  }).catch(() => {});
}

async function requireTeamUser(authHeader) {
  const supabaseUrl = process.env.VITE_SUPABASE_URL || process.env.SUPABASE_URL;
  const supabaseAnonKey = process.env.VITE_SUPABASE_ANON_KEY || process.env.SUPABASE_ANON_KEY;
  if (!supabaseUrl || !supabaseAnonKey) return false;
  const client = createClient(supabaseUrl, supabaseAnonKey, {
    auth: { persistSession: false, autoRefreshToken: false },
    global: { headers: { Authorization: authHeader } },
  });
  const { data: userData } = await client.auth.getUser();
  if (!userData?.user) return false;
  const { data: profile } = await client.from('profiles').select('role').eq('id', userData.user.id).single();
  return profile?.role === 'team';
}

export default async function handler(req, res) {
  if (req.method !== 'POST') return res.status(405).json({ error: 'Method not allowed' });

  const authHeader = req.headers.authorization || '';
  const secret = process.env.SUPABASE_WEBHOOK_SECRET;

  if (authHeader.startsWith('Bearer ')) {
    const isTeam = await requireTeamUser(authHeader);
    if (!isTeam) return res.status(403).json({ error: 'Team members only' });
  } else if (secret) {
    const incoming = req.headers['x-webhook-secret'] || req.headers['x-supabase-webhook-secret'] || '';
    if (incoming.trim() !== secret.trim()) return res.status(401).json({ error: 'Unauthorized' });
  }

  const { type, record, old_record } = req.body || {};
  if (!record?.name || !record?.company_name) return res.status(200).json({ ok: true, skipped: 'missing name or company_name' });

  const config = getConfig();
  if (!config.configured || !config.token) return res.status(200).json({ ok: true, skipped: 'not configured' });

  const companyDir = joinPath(config.clientRoot, safeName(record.company_name));
  const projectsDir = joinPath(companyDir, 'Projects');

  // Ensure Clients/{company}/Projects/ exists
  await mkdir(config, companyDir);
  await mkdir(config, projectsDir);

  if (type === 'UPDATE' && old_record?.name && old_record.name !== record.name) {
    const oldPath = joinPath(projectsDir, safeName(old_record.name));
    const newPath = joinPath(projectsDir, safeName(record.name));
    await renameFolder(config, oldPath, newPath);
  }

  // Ensure folder for current project name exists
  const projectDir = joinPath(projectsDir, safeName(record.name));
  await mkdir(config, projectDir);
  await mkdir(config, joinPath(projectDir, '00 Project Files'));

  res.status(200).json({ ok: true, type, company: record.company_name, project: record.name });
}