const fs = require('fs');
const path = require('path');
const crypto = require('crypto');
const { DatabaseSync } = require('node:sqlite');

const DB_PATH = process.env.DB_PATH || path.join(__dirname, 'data', 'app.db');
fs.mkdirSync(path.dirname(DB_PATH), { recursive: true });

const db = new DatabaseSync(DB_PATH);

db.exec(`
  CREATE TABLE IF NOT EXISTS streamers (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    google_id TEXT UNIQUE NOT NULL,
    email TEXT NOT NULL,
    name TEXT NOT NULL,
    picture TEXT,
    overlay_token TEXT UNIQUE NOT NULL,
    sender_token TEXT UNIQUE NOT NULL,
    tts_voice TEXT NOT NULL DEFAULT 'ru-RU-DmitryNeural',
    created_at INTEGER NOT NULL
  );
`);

function generateToken() {
  return crypto.randomBytes(16).toString('hex');
}

function findStreamerByGoogleId(googleId) {
  return db.prepare('SELECT * FROM streamers WHERE google_id = ?').get(googleId);
}

function findStreamerByOverlayToken(token) {
  return db.prepare('SELECT * FROM streamers WHERE overlay_token = ?').get(token);
}

function findStreamerBySenderToken(token) {
  return db.prepare('SELECT * FROM streamers WHERE sender_token = ?').get(token);
}

function createStreamer({ googleId, email, name, picture }) {
  const overlayToken = generateToken();
  const senderToken = generateToken();
  db.prepare(
    `INSERT INTO streamers (google_id, email, name, picture, overlay_token, sender_token, created_at)
     VALUES (?, ?, ?, ?, ?, ?, ?)`
  ).run(googleId, email, name, picture || null, overlayToken, senderToken, Date.now());
  return findStreamerByGoogleId(googleId);
}

function getOrCreateStreamerByGoogle({ googleId, email, name, picture }) {
  return findStreamerByGoogleId(googleId) || createStreamer({ googleId, email, name, picture });
}

module.exports = {
  findStreamerByOverlayToken,
  findStreamerBySenderToken,
  getOrCreateStreamerByGoogle,
};