import { observable } from "mobx"
import { tweakArray } from "../tweaker/tweakArray"
import { isArray } from "../utils"
import {
  FromSnapshotContext,
  internalFromSnapshot,
  observableOptions,
  registerSnapshotter,
} from "./fromSnapshot"
import { SnapshotInOfObject } from "./SnapshotOf"
import { SnapshotterAndReconcilerPriority } from "./SnapshotterAndReconcilerPriority"

function fromArraySnapshot(sn: SnapshotInOfObject<any>, ctx: FromSnapshotContext): any[] {
  const arr = observable.array([] as any[], observableOptions)
  const ln = sn.length
  for (let i = 0; i < ln; i++) {
    arr.push(internalFromSnapshot(sn[i], ctx))
  }
  return tweakArray(arr, undefined, true)
}

registerSnapshotter(SnapshotterAndReconcilerPriority.Array, (sn, ctx) => {
  if (isArray(sn)) {
    return fromArraySnapshot(sn, ctx)
  }
  return undefined
})