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import { IsoDateTime, type IsoDateTime as IsoDateTimeValue } from "@/contracts/common";
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type TrustedCodec<T> = {
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  is(value: unknown): value is T;
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};
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export const expectTrusted = <T>(codec: TrustedCodec<T>, value: unknown, label: string): T => {
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  if (!codec.is(value)) {
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    throw new Error(`Invalid trusted ${label}.`);
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  }
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  return value;
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};
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export const nullableTrusted = <T>(codec: TrustedCodec<T>, value: unknown, label: string): T | null =>
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  value === null ? null : expectTrusted(codec, value, label);
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export const isoDateTimeFromTimestamp = (value: number): IsoDateTimeValue =>
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  expectTrusted(IsoDateTime, new Date(value).toISOString(), "IsoDateTime");
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export const nullableIsoDateTimeFromTimestamp = (value: number | null): IsoDateTimeValue | null =>
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  value === null ? null : isoDateTimeFromTimestamp(value);