updux/src/reducer.ts

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import { Action, ActionCreator, createAction } from '@reduxjs/toolkit';
import { BaseActionCreator } from '@reduxjs/toolkit/dist/createAction.js';
import * as R from 'remeda';
import { Dux } from './types.js';
import { Mutation } from './Updux.js';
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import u from '@yanick/updeep-remeda';
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import prepare from 'immer';
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export type MutationCase = {
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matcher: (action: Action) => boolean;
mutation: Mutation;
terminal: boolean;
};
export function buildReducer(
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initialStateState: any,
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mutations: MutationCase[] = [],
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defaultMutation?: Omit<MutationCase, 'matcher'>,
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subduxes: Record<string, Dux> = {},
) {
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const subReducers = R.mapValues(subduxes, R.prop('reducer'));
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// TODO matcherMutation
// TODO defaultMutation
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//
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const reducer = (state = initialStateState, action: Action) => {
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const orig = state;
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if (!action?.type)
throw new Error('upreducer called with a bad action');
let terminal = false;
let didSomething = false;
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mutations
.filter(({ matcher }) => matcher(action))
.forEach(({ mutation, terminal: t }) => {
if (t) terminal = true;
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didSomething = true;
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state = prepare(
state,
mutation((action as any).payload, action),
);
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});
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if (!didSomething && defaultMutation) {
if (defaultMutation.terminal) terminal = true;
state = defaultMutation.mutation(
(action as any).payload,
action,
)(state);
}
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if (!terminal && Object.keys(subduxes).length > 0) {
// subduxes
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state = u.update(
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state,
R.mapValues(subReducers, (reducer, slice) =>
(reducer as any)(state[slice], action),
),
);
}
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return state;
};
return reducer;
/*
if (subReducers) {
if (subduxes['*']) {
newState = u.updateIn(
'*',
subduxes['*'].upreducer(action),
newState,
);
} else {
const update = mapValues(subReducers, (upReducer) =>
upReducer(action),
);
newState = u(update, newState);
}
}
const a = mutations[action.type] || mutations['+'];
if (!a) return newState;
return a(action.payload, action)(newState);
};
return wrapper ? wrapper(upreducer) : upreducer;
*/
}