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import { map } from 'rxjs/operators';
import {
AnyAction,
AnyItem,
ensureArray,
defaultGenId,
Constants,
Dispatch,
getType
} from './utils';
import {
CreateStateRxApi,
CreateStateRxOpts,
createStateRx
} from './create-staterx';
type ItemState<Item> = {
[key: string]: Item | undefined;
};
type ItemsT<T> = Partial<T> | Array<Partial<T>>;
type PartialWithId<T> = Partial<T> & { id: string };
/*******************************************************
* Actions
*******************************************************/
const createActions = <T>({
constant,
generateId,
defaultItem,
dispatch
}: {
constant: Constants;
generateId: () => string;
defaultItem: Partial<T> | (() => Partial<T>);
dispatch: Dispatch;
}) => {
return {
create: (items?: ItemsT<T>) => {
const ensureItem = (items || {}) as T;
const newCreateItems = ensureArray<PartialWithId<T>>(ensureItem).map(
(item) => {
// istanbul ignore else
if (item.id === undefined) {
item.id = generateId();
}
return {
...(typeof defaultItem === 'function'
? defaultItem()
: defaultItem),
...item
};
}
);
return dispatch({
type: constant.CREATE,
items: (newCreateItems as unknown) as T[]
});
},
update: (items: ItemsT<T>) => {
return dispatch({
type: constant.UPDATE,
items: ensureArray<T>(items)
});
},
remove: (items: ItemsT<T> | string | string[]) => {
const wrappedItems = !Array.isArray(items) ? [items] : items;
return dispatch({
type: constant.REMOVE,
items: ensureArray<T>(
typeof wrappedItems[0] === 'string'
? (wrappedItems as string[]).map((id: string) => ({ id }))
: // istanbul ignore next
wrappedItems
)
});
},
replace: (items: ItemsT<T>) => {
return dispatch({
type: constant.REPLACE,
items: ensureArray<T>(items)
});
}
};
};
/*******************************************************
* Selectors
*******************************************************/
const createSelectors = <T extends AnyItem, S>(
state$: Observable<ItemState<T>>
) => {
const all$ = state$.pipe(map((state) => Object.values(state) as T[]));
const byId = (id: string) => state$.pipe(map((state) => state[id]));
const byIds = (ids: Array<string | null | undefined>) =>
state$.pipe(
map((state) =>
ids.reduce<ItemState<T>>((acc, id) => {
// istanbul ignore else
if (id) {
acc[id] = state[id];
}
return acc;
}, {})
)
);
const mapByKey = (key: string) =>
state$.pipe(
map((state) => {
const items = state;
return Object.values(items).reduce<{
[key: string]: T[] | undefined;
}>((acc, item) => {
// istanbul ignore if
if (!item) {
return acc;
}
const arr = (acc[item[key]] = acc[item[key]] || []);
arr.push(item);
return acc;
}, {});
})
);
return {
all$,
byId,
byIds,
mapByKey
};
};
/*******************************************************
* Reducer
*******************************************************/
const createReducer = <T extends AnyItem>({
constant
}: {
constant: Constants;
}) => (state: any, action: AnyAction) => {
const items = ensureArray<T>('items' in action ? action.items : []);
const type = getType(action);
switch (type) {
case constant.CREATE:
const newCreateItems = (items as T[]).reduce<{ [id: string]: T }>(
(acc, item) => {
acc[item.id] = {
...(state[item.id] || {}),
...item
};
return acc;
},
{}
);
return {
...state,
...newCreateItems
};
case constant.UPDATE:
const newUpdatedItems = (items as T[]).reduce<{ [id: string]: T }>(
(acc, item) => {
acc[item.id] = {
...state[item.id],
...item
};
return acc;
},
{}
);
return {
...state,
...newUpdatedItems
};
case constant.REPLACE:
const newReplaceItems = items.reduce<{ [id: string]: T }>((acc, item) => {
acc[item.id] = item as T;
return acc;
}, {});
return {
...state,
...newReplaceItems
};
case constant.REMOVE:
const newRemoveItems = items.reduce(
(acc, item) => {
delete acc[item.id];
return acc;
},
{ ...state }
);
return newRemoveItems;
default:
return state;
}
};
/*******************************************************
* Item State
*******************************************************/
export interface CreateItemOpts<T, S, E>
extends CreateStateRxOpts<E, StateRxItems<T, S>, S> {
/** A default item to shallowly merge into newly created items. */
defaultItem?: Partial<T> | (() => Partial<T>);
/** A custom method for generating IDs for new items. */
generateId?: () => string;
}
export interface StateRxItems<T, S> extends CreateStateRxApi<S> {
create: (items?: ItemsT<T>) => AnyAction<string>;
update: (items: ItemsT<T>) => AnyAction<string>;
replace: (items: ItemsT<T>) => AnyAction<string>;
remove: (items: ItemsT<T> | string | string[]) => AnyAction<string>;
all$: Observable<T[]>;
byId: (id: string) => Observable<T | undefined>;
byIds: (ids: (string | null | undefined)[]) => Observable<ItemState<T>>;
mapByKey: (
key: keyof T
) => Observable<{
[key: string]: T[] | undefined;
}>;
}
export const createItems = <T extends AnyItem, E>(
initialState: ItemState<T>,
options: CreateItemOpts<T, ItemState<T>, E> = {}
) => {
const { generateId = defaultGenId, defaultItem = {} } = options;
return createStateRx(initialState, options, {
state$: new BehaviorSubject<ItemState<T>>(initialState),
constants: ['CREATE', 'REPLACE', 'REMOVE', 'UPDATE'],
createActions: (props) =>
createActions({ ...props, generateId, defaultItem }),
createReducer,
createSelectors
});
};
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