const path = require('path');
const admin = require('firebase-admin');
require('dotenv').config();

// On hosted platforms (e.g. Hugging Face Spaces) the whole service-account JSON
// is injected as a secret env var instead of a committed file. Fall back to the
// local file for development.
let serviceAccount;
if (process.env.FIREBASE_SERVICE_ACCOUNT_JSON) {
  serviceAccount = JSON.parse(process.env.FIREBASE_SERVICE_ACCOUNT_JSON);
} else {
  const credPath =
    process.env.FIREBASE_SERVICE_ACCOUNT ||
    path.join(__dirname, '..', '..', 'firebase-service-account.json');
  serviceAccount = require(credPath);
}

if (!admin.apps.length) {
  admin.initializeApp({
    credential: admin.credential.cert(serviceAccount),
    projectId: serviceAccount.project_id,
  });
}

const db = admin.firestore();
db.settings({ ignoreUndefinedProperties: true });

const { FieldValue, Timestamp } = admin.firestore;

const collections = {
  users: db.collection('users'),
  runs: db.collection('runs'),
  programs: db.collection('programs'),
  userPrograms: db.collection('userPrograms'),
  clubs: db.collection('clubs'),
  clubMembers: db.collection('clubMembers'),
  clubActivities: db.collection('clubActivities'),
  territoryCells: db.collection('territoryCells'),
};

function docToObject(doc) {
  if (!doc.exists) return null;
  const data = doc.data();
  for (const k of Object.keys(data)) {
    if (data[k] instanceof Timestamp) data[k] = data[k].toDate().toISOString();
  }
  return { id: doc.id, ...data };
}

module.exports = { admin, db, FieldValue, Timestamp, collections, docToObject };