import Vue from 'vue'
import Vuex from 'vuex'

Vue.use(Vuex)

let store = {};

(function updateModules () {
  store = normalizeRoot(require('../store/index.js'), 'store/index.js')

  // If store is an exported method = classic mode (deprecated)

  // Enforce store modules
  store.modules = store.modules || {}

  // If the environment supports hot reloading...
})()

// createStore
export const createStore = store instanceof Function ? store : () => {
  return new Vuex.Store(Object.assign({
    strict: (process.env.NODE_ENV !== 'production')
  }, store))
}

function normalizeRoot (moduleData, filePath) {
  moduleData = moduleData.default || moduleData

  if (moduleData.commit) {
    throw new Error(`[nuxt] ${filePath} should export a method that returns a Vuex instance.`)
  }

  if (typeof moduleData !== 'function') {
    // Avoid TypeError: setting a property that has only a getter when overwriting top level keys
    moduleData = Object.assign({}, moduleData)
  }
  return normalizeModule(moduleData, filePath)
}

function normalizeModule (moduleData, filePath) {
  if (moduleData.state && typeof moduleData.state !== 'function') {
    console.warn(`'state' should be a method that returns an object in ${filePath}`)

    const state = Object.assign({}, moduleData.state)
    // Avoid TypeError: setting a property that has only a getter when overwriting top level keys
    moduleData = Object.assign({}, moduleData, { state: () => state })
  }
  return moduleData
}