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import {
AnyAction,
genRandomString,
createConstants,
Reducer,
Constants,
Dispatcher,
DispatchersList,
wrapDispatchSubject,
Dispatch
} from './utils';
import { distinctUntilChanged, map, mergeMap } from 'rxjs/operators';
const DEFAULT_CONSTANTS = ['SET', 'RESET'];
export interface CreateStateRxOpts<E, Api, State> {
name?: string;
autoRun?: boolean;
effects?: (srx: Api) => E;
reducer?: (state: State, action: AnyAction) => State;
}
export interface CreateStateRxApi<S> {
name: string;
state$: BehaviorSubject<S>;
action$: Observable<AnyAction<any>>;
get: () => S;
set: (data: S | ((val: S) => S)) => { type: string; data: S };
reset: () => { type: string };
dispatch: <A extends AnyAction>(action: A) => A;
_dispatchers$: Subject<Subject<AnyAction<any>>>;
}
export interface CloneApi<State, Api, Effects> {
clone: (initialState?: State) => Api & Effects;
}
type CreateReducer<T, S> = (params: { constant: Constants }) => Reducer<S>;
type CreateActions<T, S, A> = (params: {
constant: Constants;
get: () => S;
dispatch: Dispatch;
}) => A;
type CreateSelectors<T, S, R> = (state$: BehaviorSubject<S>) => R;
const createBaseActions = <T>({
constant,
get
}: {
constant: Constants;
get: () => T;
}) => {
const dispatch$ = new Subject<AnyAction<any>>();
const _dispatchers$ = new Subject<Subject<AnyAction<any>>>();
const action$ = merge<AnyAction<any>>(
dispatch$,
_dispatchers$.pipe(mergeMap((obs$) => obs$))
);
const dispatch = wrapDispatchSubject(dispatch$);
return {
action$,
set: (data: T | ((val: T) => T)) => {
// @ts-ignore
data = typeof data === 'function' ? data(get()) : data;
return dispatch({ type: constant.SET, data });
},
reset: () => dispatch({ type: constant.RESET }),
dispatch,
_dispatchers$
};
};
const createBaseReducer = <S>({
initialState,
constant,
reducer,
userReducer
}: {
initialState: S;
constant: Constants;
reducer: Reducer;
userReducer: Reducer;
}) => (state: any, action: AnyAction): S => {
const type = action.type.split('/', 2).join('/');
switch (type) {
case constant.SET:
return action.data;
case constant.RESET:
return initialState;
default:
const res = reducer(state, action);
// if the result is the same as our initial state
// pass it on to the user reducer
return res === state ? userReducer(state, action) : res;
}
};
export const createStateRx = <
T,
State,
Effects,
ConstantsArray extends string[],
Actions extends {},
Selectors extends {},
Api extends CreateStateRxApi<State>
>(
initialState: State,
options: CreateStateRxOpts<Effects, Api, State>,
overrides: {
state$: BehaviorSubject<State>;
constants: ConstantsArray;
createReducer: CreateReducer<T, State>;
createActions: CreateActions<T, State, Actions>;
createSelectors?: CreateSelectors<T, State, Selectors>;
}
) => {
const {
name = genRandomString(),
autoRun = true,
reducer: userReducer = (state) => state
} = options;
const {
state$,
constants,
createReducer,
createActions,
createSelectors
} = overrides;
const constant = createConstants(name, [...DEFAULT_CONSTANTS, ...constants]);
const get = () => state$.getValue();
const { action$, dispatch, ...baseActions } = createBaseActions({
constant,
get
});
const { ...actions } = createActions({
constant,
get,
dispatch
});
const selectors = createSelectors?.(state$);
const reducer = createBaseReducer({
constant,
initialState,
reducer: createReducer({
constant
}),
userReducer
});
const clone = (newInitialState: State = get()) =>
createStateRx(newInitialState, options, {
...overrides,
state$: new BehaviorSubject<State>(newInitialState)
});
const _reducer$ = action$.pipe(
map((action) => reducer(state$.getValue(), action)),
distinctUntilChanged()
);
const run = () => _reducer$.subscribe(state$);
const api = ({
...actions,
...selectors,
...baseActions,
name,
state$,
action$,
constant,
run,
get,
clone,
dispatch,
_reducer$
} as unknown) as Api & CloneApi<State, Api, Effects>;
const effects = options.effects?.(api) as Effects;
autoRun && run();
return { ...api, ...effects };
};
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