/**
 * Auth Page Service
 *
 * Processes URL parameters for auth pages and provides structured data.
 * This is a composition service, not an API service.
 */

import { Result } from '@/lib/contracts/Result';
import { LoginPageDTO } from './types/LoginPageDTO';
import { ForgotPasswordPageDTO } from './types/ForgotPasswordPageDTO';
import { ResetPasswordPageDTO } from './types/ResetPasswordPageDTO';
import { SignupPageDTO } from './types/SignupPageDTO';
import { AuthPageParams } from './AuthPageParams';

export class AuthPageService {
  async processLoginParams(params: AuthPageParams): Promise<Result<LoginPageDTO, string>> {
    try {
      const returnTo = params.returnTo ?? '/dashboard';
      const hasInsufficientPermissions = params.returnTo !== null;

      return Result.ok({
        returnTo,
        hasInsufficientPermissions,
      });
    } catch (error) {
      return Result.err('Failed to process login parameters');
    }
  }

  async processForgotPasswordParams(params: AuthPageParams): Promise<Result<ForgotPasswordPageDTO, string>> {
    try {
      const returnTo = params.returnTo ?? '/auth/login';
      return Result.ok({ returnTo });
    } catch (error) {
      return Result.err('Failed to process forgot password parameters');
    }
  }

  async processResetPasswordParams(params: AuthPageParams): Promise<Result<ResetPasswordPageDTO, string>> {
    try {
      const token = params.token;
      if (!token) {
        return Result.err('Missing reset token');
      }
      const returnTo = params.returnTo ?? '/auth/login';
      return Result.ok({ token, returnTo });
    } catch (error) {
      return Result.err('Failed to process reset password parameters');
    }
  }

  async processSignupParams(params: AuthPageParams): Promise<Result<SignupPageDTO, string>> {
    try {
      const returnTo = params.returnTo ?? '/onboarding';
      return Result.ok({ returnTo });
    } catch (error) {
      return Result.err('Failed to process signup parameters');
    }
  }
}