/**
 * useWizard Hook
 *
 * Primary hook for accessing wizard context.
 * Provides all wizard functionality to step components.
 */

import { useContext } from 'react';
import { WizardContext } from './WizardProvider';
import type { WizardContextValue } from './types';

/**
 * Hook to access wizard context
 *
 * @throws Error if used outside of WizardProvider
 *
 * @example
 * ```tsx
 * function MyStepComponent() {
 *   const {
 *     data,
 *     updateField,
 *     next,
 *     prev,
 *     errors,
 *     isValidating,
 *   } = useWizard<MyFormData>();
 *
 *   return (
 *     <form>
 *       <input
 *         value={data.name || ''}
 *         onChange={(e) => updateField('name', e.target.value)}
 *       />
 *       {errors.name && <span>{errors.name}</span>}
 *       <button onClick={prev}>Back</button>
 *       <button onClick={next} disabled={isValidating}>
 *         {isValidating ? 'Validating...' : 'Next'}
 *       </button>
 *     </form>
 *   );
 * }
 * ```
 */
export function useWizard<
  TData extends Record<string, unknown> = Record<string, unknown>
>(): WizardContextValue<TData> {
  const context = useContext(WizardContext);

  if (!context) {
    throw new Error(
      'useWizard must be used within a WizardProvider. ' +
        'Wrap your component tree with <WizardProvider>.'
    );
  }

  return context as WizardContextValue<TData>;
}