import passport from 'passport';
import { Strategy as GitHubStrategy } from 'passport-github2';
import { db } from './database';

passport.serializeUser((user: any, done) => {
  done(null, user.id);
});

passport.deserializeUser((id: number, done) => {
  try {
    const stmt = db.prepare('SELECT * FROM users WHERE id = ?');
    const user = stmt.get(id);
    done(null, user);
  } catch (error) {
    done(error, null);
  }
});

passport.use(new GitHubStrategy({
  clientID: process.env.GITHUB_CLIENT_ID!,
  clientSecret: process.env.GITHUB_CLIENT_SECRET!,
  callbackURL: '/auth/github/callback'
}, async (accessToken, refreshToken, profile, done) => {
  try {
    let user;
    const existingUser = db.prepare('SELECT * FROM users WHERE github_id = ?').get(profile.id);

    if (existingUser) {
      user = existingUser;
    } else {
      const stmt = db.prepare(`
        INSERT INTO users (github_id, username, display_name, avatar_url, email)
        VALUES (?, ?, ?, ?, ?)
      `);
      
      const result = stmt.run(
        profile.id,
        profile.username,
        profile.displayName || profile.username,
        profile._json.avatar_url,
        profile._json.email
      );
      
      user = db.prepare('SELECT * FROM users WHERE id = ?').get(result.lastInsertRowid);
    }

    return done(null, user);
  } catch (error) {
    return done(error, undefined);
  }
}));

export { passport };