'use client';

/**
 * useIntakeContext Hook
 *
 * Provides patient and intake context for Cortex blocks.
 * Falls back to activePatient from store when prefill is not provided.
 *
 * Epic: E2.S2 - Custom Hooks
 */

import { useMemo } from 'react';
import { useCortexStore } from '@/stores/cortex-store';
import type { BlockPrefillData } from '@/stores/cortex-store';
import { formatPatientName } from '@/lib/fhir/patient-mapper';

// ============================================================================
// Types
// ============================================================================

/**
 * Extended prefill data with intake-specific fields.
 * Blocks can pass this to get intake context.
 */
export interface IntakePrefillData extends BlockPrefillData {
  /** Intake ID for intake-specific operations */
  intakeId?: string;
}

interface UseIntakeContextResult {
  /** Patient ID (van prefill of activePatient) */
  patientId: string | null;
  /** Intake ID (van prefill) */
  intakeId: string | null;
  /** Patient naam (voor display) */
  patientName: string | null;
  /** Of er patient context is */
  hasPatientContext: boolean;
  /** Of er intake context is */
  hasIntakeContext: boolean;
}

// ============================================================================
// Hook
// ============================================================================

/**
 * Hook for getting patient and intake context in Cortex blocks.
 *
 * Priority:
 * 1. Explicit prefill data (from intent classification)
 * 2. activePatient from store (fallback)
 *
 * @example
 * const { patientId, intakeId, hasPatientContext } = useIntakeContext(prefill);
 *
 * if (!hasPatientContext) {
 *   return <BlockEmpty icon={User} message="Selecteer eerst een patiënt" />;
 * }
 */
export function useIntakeContext(
  prefill?: IntakePrefillData
): UseIntakeContextResult {
  const { activePatient } = useCortexStore();

  return useMemo(() => {
    // Patient context: prefill takes priority, then activePatient
    const patientId = prefill?.patientId || activePatient?.id || null;
    const patientName =
      prefill?.patientName ||
      (activePatient ? formatPatientName(activePatient) : null);

    // Intake context: only from prefill for now
    // TODO: Add activeIntake to cortex-store for persistent intake context
    const intakeId = prefill?.intakeId || null;

    return {
      patientId,
      intakeId,
      patientName,
      hasPatientContext: Boolean(patientId),
      hasIntakeContext: Boolean(intakeId),
    };
  }, [prefill, activePatient]);
}