expert-m / redux-class-decorators

import { DecoratorHelper, pathReducerMethods, toUnderscoreCase } from './utils'

export default function ReducerClass(prefix) {

  prefix = toUnderscoreCase(prefix)

  return function (target) {

    if (DecoratorHelper.isDecorated(target)) {

      return target

    }

    const reducerMap = pathReducerMethods(target, prefix)

    const initialState = DecoratorHelper.getStaticField(target, 'initialState')

    const reducer = (state = initialState, action) => (

      (action && reducerMap[action.type]) ? reducerMap[action.type](state, action) : state

    )

    DecoratorHelper.setStaticMethod(target, '$reducer', reducer)

    DecoratorHelper.markAsDecorated(target)

    return target

  }

}