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const ObservableStore = require('obs-store')
/**
* An ObservableStore that can composes a flat
* structure of child stores based on configuration
*/
class ComposableObservableStore extends ObservableStore {
/**
* Create a new store
*
* @param {Object} [initState] - The initial store state
* @param {Object} [config] - Map of internal state keys to child stores
*/
constructor (initState, config) {
super(initState)
this.updateStructure(config)
}
/**
* Composes a new internal store subscription structure
*
* @param {Object} [config] - Map of internal state keys to child stores
*/
updateStructure (config) {
this.config = config
this.removeAllListeners()
for (const key in config) {
config[key].subscribe((state) => {
this.updateState({ [key]: state })
})
}
}
/**
* Merges all child store state into a single object rather than
* returning an object keyed by child store class name
*
* @returns {Object} - Object containing merged child store state
*/
getFlatState () {
let flatState = {}
for (const key in this.config) {
const controller = this.config[key]
const state = controller.getState ? controller.getState() : controller.state
flatState = { ...flatState, ...state }
}
return flatState
}
}
module.exports = ComposableObservableStore
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