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import { onSnapshot } from 'mobx-state-tree'
import { RootStoreModel, RootStore } from './root-store'
import { Environment } from '../environment'
import * as storage from '../../utils/storage'
/**
* The key we'll be saving our state as within async storage.
*/
const ROOT_STATE_STORAGE_KEY = 'root'
/**
* Setup the environment that all the models will be sharing.
*
* The environment includes other functions that will be picked from some
* of the models that get created later. This is how we loosly couple things
* like events between models.
*/
export async function createEnvironment() {
const env = new Environment()
await env.setup()
return env
}
/**
* Setup the root state.
*/
export async function setupRootStore() {
let rootStore: RootStore
let data: any
// prepare the environment that will be associated with the RootStore.
const env = await createEnvironment()
try {
// load data from storage
data = (await storage.load(ROOT_STATE_STORAGE_KEY)) || {}
rootStore = RootStoreModel.create(data, env)
} catch (e) {
// if there's any problems loading, then let's at least fallback to an empty state
// instead of crashing.
rootStore = RootStoreModel.create({}, env)
// but please inform us what happened
__DEV__ && console.tron.error(e.message, null)
}
// reactotron logging
if (__DEV__) {
env.reactotron.setRootStore(rootStore, data)
}
// track changes & save to storage
onSnapshot(rootStore, (snapshot) =>
storage.save(ROOT_STATE_STORAGE_KEY, snapshot),
)
return rootStore
}
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