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import {
AC,
Flatten,
ExtractPayload,
Reducer,
ActionLike,
ActionType,
} from './types';
import { toArray, getACType } from './utils';
export type OnHandler<S, T extends AC> = (
state: S,
payload: ExtractPayload<ReturnType<T>>,
action: Flatten<ReturnType<T> & { type: string }>
) => void;
export type ReplaceHandler<S, T extends AC> = (
state: S,
payload: ExtractPayload<ReturnType<T>>,
action: Flatten<ReturnType<T> & { type: string }>
) => S;
export type AttachFn<S> = {
<T extends keyof S>(prop: T, fn: Reducer<S[T]>): ChainedReducer<S>;
(fn: Reducer<S>): ChainedReducer<S>;
};
const createNestedReducer = <S, P extends keyof S>(
prop: P,
reducer: Reducer<S[P]>
): Reducer<S> => (state, action) => {
Iif (typeof state === 'undefined') {
throw new Error(
'tried to create createNestedReducer with undefined parent state'
);
}
const subState = reducer(state[prop], action);
if (state[prop] !== subState) {
return {
...state,
[prop]: subState,
};
}
return state;
};
export class ChainedReducer<S> {
private reducerMap: Map<symbol, Map<string, Array<Reducer<S>>>>;
private defaultReducers: Array<Reducer<S>>;
private reducer: ChainedReducer<S> & Reducer<S> | null;
constructor(private initial: S) {
this.reducerMap = new Map();
this.defaultReducers = [];
this.reducer = null;
}
asReducer() {
if (!this.reducer) {
const reducer: any = this.getReducer();
Object.getOwnPropertyNames(ChainedReducer.prototype).forEach(key => {
const prop = (this as any)[key];
Eif (typeof prop === 'function') {
reducer[key] = prop.bind(this);
}
});
this.reducer = reducer;
}
return this.reducer!;
}
attach<T extends keyof S>(fn: Reducer<S>): ChainedReducer<S> & Reducer<S>;
attach<T extends keyof S>(
prop: T,
fn: Reducer<S[T]>
): ChainedReducer<S> & Reducer<S>;
attach<T extends keyof S>(prop: T | Reducer<S>, fn?: Reducer<S[T]>) {
if (typeof prop === 'string') {
Iif (typeof fn !== 'function') {
throw new Error('fn must be a function');
}
this.defaultReducers.push(createNestedReducer(prop, fn));
} else {
Iif (typeof prop !== 'function') {
throw new Error('fn must be a function');
}
this.defaultReducers.push(prop);
}
return this.asReducer();
}
replace<T extends AC>(actionCreator: T, fn: ReplaceHandler<S, T>) {
this.transform(
actionCreator,
(state, action: any) =>
produce(state, draft => fn(draft as S, action.payload, action))!
);
return this.asReducer();
}
mergePayload(actionCreators: AC) {
this.transform(actionCreators, (state, action: any) =>
Object.assign({}, state, action.payload)
);
return this.asReducer();
}
nested<T extends keyof S>(
prop: T,
fn: (reducer: ChainedReducer<S[T]>) => ChainedReducer<S[T]>
) {
const nested = fn(new ChainedReducer(this.initial[prop]));
this.defaultReducers.push(createNestedReducer(prop, nested.getReducer()));
return this.asReducer();
}
on<T extends AC>(actionCreator: T, fn: OnHandler<S, T>) {
this.transform(
actionCreator,
(state, action: any) =>
produce(state, draft => fn(draft as S, action.payload, action))!
);
return this.asReducer();
}
onMany<T extends AC, T2 extends AC>(
actionCreator: [T, T2],
fn: OnHandler<S, T | T2>
): Reducer<S> & this;
onMany<T extends AC, T2 extends AC, T3 extends AC>(
actionCreator: [T, T2, T3],
fn: OnHandler<S, T | T2 | T3>
): Reducer<S> & this;
onMany(actionCreator: any, fn: OnHandler<S, AC>) {
return this.on(actionCreator, fn);
}
private getReducer() {
return (state: S = this.initial, action: ActionLike) => {
Iif (!action.type) {
throw new Error('action.type must be defined');
}
const reducers = this.getReducers(action.type).concat(
this.defaultReducers
);
if (!reducers.length) {
return state;
}
return reducers.reduce((prev, fn) => fn(prev, action), state);
};
}
private getReducers(actionType: ActionType) {
const [symbol, type] = actionType!;
if (!this.reducerMap.has(symbol)) {
this.reducerMap.set(symbol, new Map());
}
const map = this.reducerMap.get(symbol)!;
if (!map.has(type)) {
map.set(type, []);
}
return map.get(type)!;
}
private transform(actionCreators: AC | AC[], reducerFn: Reducer<S>) {
const actionTypes = toArray(actionCreators).map(ac => getACType(ac));
actionTypes.forEach(action => {
this.getReducers(action).push(reducerFn);
});
}
}
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