@bigfishtv/cockpit/src/reducers/fileTypes.js

/**
 * @module Reducers/fileTypes
 */

import {
	FILE_EXTENSIONS_INITED,
	FILE_EXTENSION_ADDED,
	FILE_EXTENSIONS_ADDED,
	FILE_EXTENSION_REMOVED,
	FILE_EXTENSIONS_REMOVED,
	FILE_CATEGORY_EMPTIED,
} from '../constants/ActionTypes'

const initialState = {}

/**
 * Reducer for managing file type extensions
 * @param  {Object} state
 * @param  {Object} action
 * @param  {String} action.type - const action type from constants/ActionTypes
 * @return {Object} returns state
 */
export default function(state = initialState, action) {
	switch (action.type) {
		case FILE_EXTENSIONS_INITED:
			return { ...action.state } || state

		case FILE_EXTENSION_ADDED:
			if (!state[action.category]) {
				state[action.category] = [action.extension]
			} else if (state[action.category].indexOf(action.extension) < 0) {
				state[action.category].push(action.extension)
			}
			return state

		case FILE_EXTENSIONS_ADDED:
			if (!state[action.category]) {
				state[action.category] = action.extensions
			} else {
				action.extensions.map(extension => {
					if (state[action.category].indexOf(extension) < 0) state[action.category].push(extension)
				})
			}
			return state

		case FILE_EXTENSION_REMOVED:
			if (state[action.category]) {
				const index = state[action.category].indexOf(action.extension)
				if (index >= 0) state[action.category].splice(index, 1)
			}
			return state

		case FILE_EXTENSIONS_REMOVED:
			if (state[action.category]) {
				action.extensions.map(extension => {
					const index = state[action.category].indexOf(extension)
					if (index >= 0) state[action.category].splice(index, 1)
				})
			}
			return state

		case FILE_CATEGORY_EMPTIED:
			if (state[action.category]) state[action.category] = []
			return state
	}
	return state
}