import { ViewModel } from "../../contracts/view-models/ViewModel";
import type { ResetPasswordFormState, ResetPasswordUIState } from "./ResetPasswordInterfaces";

/**
 * Reset Password ViewModel
 * 
 * Client-side state management for reset password flow.
 * Immutable, class-based, contains only UI state.
 */
export class ResetPasswordViewModel extends ViewModel {
  constructor(
    public readonly token: string,
    public readonly returnTo: string,
    public readonly formState: ResetPasswordFormState,
    public readonly uiState: ResetPasswordUIState,
    public readonly showSuccess: boolean = false,
    public readonly successMessage: string | null = null,
    public readonly mutationPending: boolean = false,
    public readonly mutationError: string | null = null
  ) {
    super();
  }

  withFormState(formState: ResetPasswordFormState): ResetPasswordViewModel {
    return new ResetPasswordViewModel(
      this.token,
      this.returnTo,
      formState,
      this.uiState,
      this.showSuccess,
      this.successMessage,
      this.mutationPending,
      this.mutationError
    );
  }

  withUIState(uiState: ResetPasswordUIState): ResetPasswordViewModel {
    return new ResetPasswordViewModel(
      this.token,
      this.returnTo,
      this.formState,
      uiState,
      this.showSuccess,
      this.successMessage,
      this.mutationPending,
      this.mutationError
    );
  }

  withSuccess(successMessage: string): ResetPasswordViewModel {
    return new ResetPasswordViewModel(
      this.token,
      this.returnTo,
      this.formState,
      this.uiState,
      true,
      successMessage,
      false,
      null
    );
  }

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

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

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