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import { decodePktLines } from "@/worker/git/core";
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/**
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 * Parses Git fetch protocol v2 arguments from request body.
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 * Extracts wants, haves, and done flag from pkt-line formatted data.
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 *
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 * @param body - Raw request body in pkt-line format
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 * @returns Object containing wants array, haves array, and done flag
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 */
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export function parseFetchArgs(body: Uint8Array) {
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  const items = decodePktLines(body);
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  const wantSet = new Set<string>();
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  const haves: string[] = [];
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  let done = false;
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  for (const item of items) {
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    if (item.type === "line" && item.text) {
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      const text = item.text.trimEnd();
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      if (text.startsWith("want ")) {
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        const oid = text.slice(5);
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        if (oid.length >= 40) wantSet.add(oid.substring(0, 40));
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      } else if (text.startsWith("have ")) {
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        const oid = text.slice(5);
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        if (oid.length >= 40) haves.push(oid.substring(0, 40));
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      } else if (text === "done") {
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        done = true;
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      }
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    }
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  }
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  const wants = Array.from(wantSet);
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  return { wants, haves, done };
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}