/**
 * External dependencies
 */
import { isEqual, keyBy, omit } from 'lodash';
import type { AnyAction } from '@nab/types';

/**
 * Internal dependencies
 */
import { INIT_STATE } from './config';
import type { Action } from './actions';
import type { State } from './types';

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

function actualReducer( state: State, action: Action ): State {
	switch ( action.type ) {
		case 'ADD_CONVERSION_ACTION_TYPES': {
			const newConversionActionTypes = {
				...state.conversionActionTypes,
				...keyBy( action.conversionActionTypes, 'name' ),
			};
			if (
				isEqual( state.conversionActionTypes, newConversionActionTypes )
			) {
				return state;
			}

			return {
				...state,
				conversionActionTypes: newConversionActionTypes,
			};
		}

		case 'REMOVE_CONVERSION_ACTION_TYPES': {
			const newConversionActionTypes = omit(
				state.conversionActionTypes,
				action.names
			);
			if (
				isEqual( state.conversionActionTypes, newConversionActionTypes )
			) {
				return state;
			}

			return {
				...state,
				conversionActionTypes: newConversionActionTypes,
			};
		}
	}
}