/**
 * Login View Data Builder
 * 
 * Transforms LoginPageDTO into ViewData for the login template.
 * Deterministic, side-effect free, no business logic.
 */

import { LoginPageDTO } from '@/lib/services/auth/types/LoginPageDTO';

export interface FormFieldState {
  value: string | boolean;
  error?: string;
  touched: boolean;
  validating: boolean;
}

export interface FormState {
  fields: {
    email: FormFieldState;
    password: FormFieldState;
    rememberMe: FormFieldState;
  };
  isValid: boolean;
  isSubmitting: boolean;
  submitError?: string;
  submitCount: number;
}

export interface LoginViewData {
  returnTo: string;
  hasInsufficientPermissions: boolean;
  showPassword: boolean;
  showErrorDetails: boolean;
  formState: FormState;
  isSubmitting: boolean;
  submitError?: string;
}

export class LoginViewDataBuilder {
  static build(data: LoginPageDTO): LoginViewData {
    return {
      returnTo: data.returnTo,
      hasInsufficientPermissions: data.hasInsufficientPermissions,
      showPassword: false,
      showErrorDetails: false,
      formState: {
        fields: {
          email: { value: '', error: undefined, touched: false, validating: false },
          password: { value: '', error: undefined, touched: false, validating: false },
          rememberMe: { value: false, error: undefined, touched: false, validating: false },
        },
        isValid: true,
        isSubmitting: false,
        submitError: undefined,
        submitCount: 0,
      },
      isSubmitting: false,
      submitError: undefined,
    };
  }
}