import { Injectable } from '@nestjs/common';
import { PassportStrategy } from '@nestjs/passport';
import { Strategy, VerifyCallback, Profile, StrategyOptions } from 'passport-google-oauth20';
import { ConfigService } from '@nestjs/config';
import { AuthService } from './auth.service';

@Injectable()
export class GoogleStrategy extends PassportStrategy(Strategy, 'google') {
  constructor(
    private readonly configService: ConfigService,
    private readonly authService: AuthService,
  ) {
    const options: StrategyOptions = {
      clientID: configService.get<string>('GOOGLE_CLIENT_ID') || '',
      clientSecret: configService.get<string>('GOOGLE_CLIENT_SECRET') || '',
      callbackURL: configService.get<string>('GOOGLE_CALLBACK_URL') || '',
      scope: ['email', 'profile'],
    };
    super(options);
  }

  async validate(
    _accessToken: string,
    _refreshToken: string,
    profile: Profile,
    done: VerifyCallback,
  ): Promise<void> {
    try {
      const user = await this.authService.validateOAuthUser({
        id: profile.id,
        emails: profile.emails as Array<{ value: string; verified: boolean }>,
        displayName: profile.displayName,
        photos: profile.photos as Array<{ value: string }>,
      });
      done(null, user);
    } catch (error) {
      done(error as Error, undefined);
    }
  }
}