/**
 * External dependencies
 */
import type { AnyAction } from '@nab/types';

/**
 * Internal dependencies
 */
import { INIT_STATE } from '../config';
import type { State as FullState } from '../types';
import type { RecommendationEngineAction as Action } from '../actions/recommendation-engine';

type State = FullState[ 'recommendationEngine' ];

export function recommendationEngine(
	state = INIT_STATE.recommendationEngine,
	action: AnyAction
): State {
	return actualReducer( state, action as Action ) ?? state;
}

function actualReducer( state: State, action: Action ): State {
	switch ( action.type ) {
		case 'INIT_RECOMMENDATION_ENGINE_DATA':
			return {
				...state,
				...action.data,
			};

		case 'MARK_OPPORTUNTIY_AS_BEING_INSTANTIATED':
			return {
				...state,
				instantiatingOpportunity: action.opportunity,
			};

		case 'SET_SUGGESTION_GENERATION_STATE':
			return {
				...state,
				suggestionGenerationState: action.state,
			};
	}
}