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import { ifNoneMatchBlocks, strongEtagMatches } from "@/worker/dav/etag";
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import { ifHeaderMatchesStateAndEtags, type ParsedIfHeader } from "@/worker/dav/if-header";
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export interface DavConditionalInput {
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  ifMatch: string | null;
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  ifNoneMatch: string | null;
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  ifHeader: ParsedIfHeader;
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  targetHref: string;
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  targetEtag: string | null;
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  getEtag: (href: string) => string | null;
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  getStateToken: (href: string) => string | null;
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}
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export function davConditionalFailure(input: DavConditionalInput): string | null {
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  if (input.ifMatch && !strongEtagMatches(input.ifMatch, input.targetEtag)) {
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    return "If-Match precondition failed";
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  }
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  if (input.ifNoneMatch && input.targetEtag !== null && ifNoneMatchBlocks(input.ifNoneMatch, input.targetEtag)) {
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    return "If-None-Match precondition failed";
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  }
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  if (
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    !ifHeaderMatchesStateAndEtags({
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      header: input.ifHeader,
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      targetHref: input.targetHref,
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      targetEtag: input.targetEtag,
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      getEtag: input.getEtag,
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      getStateToken: input.getStateToken,
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    })
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  ) {
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    return "If precondition failed";
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  }
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  return null;
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}