// eslint-disable-next-line import/named
import {Draft} from 'immer'

export interface ReimOptions<T> {
  name?: string;
  actions?: Actions<T>;
}

export type Mutation<TS> = ((state: Draft<TS> | TS) => void | TS) | Partial<TS> | TS
export type Action<TS> = ((...args: any[]) => Mutation<TS>)
export type Actions<TS> = {[index: string]: Action<TS>}

// export type Effect<TR> = (...args: any[]) => (store: TR) => any
// export type Effects<TR> = {[index: string]: Effect<TR>}

export type Cache<TS, TF> = TF extends ((s: TS) => any)
  ? ReturnType<TF>
  : TF extends {[index: string]: (s: TS) => TS}
    ? {[Tk in keyof TF]: ReturnType<TF[Tk]>}
    : any
export type Filter<TS> =
  | ((s: TS) => any)
  | {[index: string]: ((s: TS) => any)}
  | keyof TS
export type SnapshotFor<TF, T> = TF extends ((s: any) => any) // TF extends (null | undefined) ? T :
  ? ReturnType<TF>
  : TF extends {
    [index: string]: ((s: T) => any);
  }
    ? {[Tk in keyof TF]: ReturnType<TF[Tk]>}
    : TF extends keyof T ? T[TF] : T
export type Meta = {
  mutation?: string;
  payload?: any[];
}
export type Handler<T> =
  | {next: (s: T, meta?: Meta) => any}
  | ((s: T, meta?: Meta) => any)