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import { BalanceMap, newCategoryBalanceMapFromDto } from "../types/balanceMap";
import { BudgetMap, newBudgetMapFromDto } from "../types/budgetMap";
import { Category, newCategoryFromDto } from "../types/category";
const backendUrl = "http://localhost:8000";
function makeGetter<T>(params: FetcherMakerParams<T>): Getter<T> {
const parser =
"parser" in params
? params.parser
: (dto: unknown[]) => <T>dto.map(params.elementParser);
return async function () {
const response = await fetch(`${backendUrl}${params.path}`);
const dto = await response.json();
try {
return parser(dto);
} catch (err) {
console.error(`Error parsing DTO. ${err?.toString() ?? ""}`);
return null;
}
};
}
export const getAllCategories: Getter<Category[]> = async () => {
const balances = await getAllCategoryBalances();
const budgets = await getAllCurrentCategoryBudgets();
return makeGetter<Category[]>({
path: "/category",
elementParser: newCategoryFromDto(balances, budgets),
})();
};
export const getAllCategoryBalances: Getter<BalanceMap<Category>> = makeGetter<
BalanceMap<Category>
>({
path: "/balance/category",
parser: newCategoryBalanceMapFromDto,
});
export const getAllCurrentCategoryBudgets: Getter<BudgetMap<Category>> =
makeGetter<BudgetMap<Category>>({
path: "/budget/category?current",
parser: newBudgetMapFromDto,
});
type FetcherMakerParams<T> = {
path: string;
} & AnyParser<T>;
type Parser<T> = { parser: (dto: unknown) => T | null };
type ElementParser<T> = { elementParser: (dto: unknown) => T | null };
type AnyParser<T> = T extends any[]
? Parser<T> | ElementParser<T[number]>
: Parser<T>;
type Getter<T> = () => Promise<T | null>;
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