import { ViewModel } from "../../contracts/view-models/ViewModel";
import type { ForgotPasswordFormState } from "./ForgotPasswordInterfaces";

/**
 * Forgot Password ViewModel
 * 
 * Client-side state management for forgot password flow.
 * Immutable, class-based, contains only UI state.
 */
export class ForgotPasswordViewModel extends ViewModel {
  constructor(
    public readonly returnTo: string,
    public readonly formState: ForgotPasswordFormState,
    public readonly showSuccess: boolean = false,
    public readonly successMessage: string | null = null,
    public readonly magicLink: string | null = null,
    public readonly mutationPending: boolean = false,
    public readonly mutationError: string | null = null
  ) {
    super();
  }

  withFormState(formState: ForgotPasswordFormState): ForgotPasswordViewModel {
    return new ForgotPasswordViewModel(
      this.returnTo,
      formState,
      this.showSuccess,
      this.successMessage,
      this.magicLink,
      this.mutationPending,
      this.mutationError
    );
  }

  withSuccess(successMessage: string, magicLink: string | null = null): ForgotPasswordViewModel {
    return new ForgotPasswordViewModel(
      this.returnTo,
      this.formState,
      true,
      successMessage,
      magicLink,
      false,
      null
    );
  }

  withMutationState(pending: boolean, error: string | null): ForgotPasswordViewModel {
    return new ForgotPasswordViewModel(
      this.returnTo,
      this.formState,
      this.showSuccess,
      this.successMessage,
      this.magicLink,
      pending,
      error
    );
  }

  get isSubmitting(): boolean {
    return this.formState.isSubmitting || this.mutationPending;
  }

  get submitError(): string | undefined {
    return this.formState.submitError || this.mutationError || undefined;
  }
}