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import { it, expect, describe } from "vitest";
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import { parseCommitRefs, parseTreeChildOids, inflateAndParseHeader } from "@/worker/git/core";
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import { deflate } from "@/worker/common";
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describe("shared parse helpers", () => {
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  it("parseCommitRefs extracts tree and parents correctly", () => {
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    const commitContent = new TextEncoder().encode(
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      `tree 4b825dc642cb6eb9a060e54bf8d69288fbee4904
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parent 1234567890abcdef1234567890abcdef12345678
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parent abcdef1234567890abcdef1234567890abcdef12
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author Test User <test@example.com> 1234567890 +0000
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committer Test User <test@example.com> 1234567890 +0000
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Test commit message`
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    );
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    const refs = parseCommitRefs(commitContent);
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    expect(refs.tree).toBe("4b825dc642cb6eb9a060e54bf8d69288fbee4904");
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    expect(refs.parents).toEqual([
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      "1234567890abcdef1234567890abcdef12345678",
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      "abcdef1234567890abcdef1234567890abcdef12",
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    ]);
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  });
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  it("parseTreeChildOids extracts child OIDs from tree content", () => {
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    // Tree entry format: mode<space>name<null>20-byte-sha
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    const entries: Uint8Array[] = [];
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    // Add a file entry
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    entries.push(new TextEncoder().encode("100644 file.txt"));
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    entries.push(new Uint8Array([0])); // null terminator
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    entries.push(
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      new Uint8Array([
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        0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef, 0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd,
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        0xef, 0x12, 0x34, 0x56, 0x78,
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      ])
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    );
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    // Add a directory entry
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    entries.push(new TextEncoder().encode("40000 dir"));
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    entries.push(new Uint8Array([0])); // null terminator
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    entries.push(
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      new Uint8Array([
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        0xab, 0xcd, 0xef, 0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef, 0x12, 0x34, 0x56, 0x78,
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        0x90, 0xab, 0xcd, 0xef, 0x12,
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      ])
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    );
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    // Concatenate all entries
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    let totalLength = 0;
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    for (const entry of entries) {
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      totalLength += entry.length;
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    }
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    const treeContent = new Uint8Array(totalLength);
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    let offset = 0;
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    for (const entry of entries) {
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      treeContent.set(entry, offset);
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      offset += entry.length;
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    }
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    const childOids = parseTreeChildOids(treeContent);
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    expect(childOids).toEqual([
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      "1234567890abcdef1234567890abcdef12345678",
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      "abcdef1234567890abcdef1234567890abcdef12",
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    ]);
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  });
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  it("inflateAndParseHeader correctly parses compressed git objects", async () => {
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    const payload = new TextEncoder().encode("Hello, World!");
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    const header = new TextEncoder().encode(`blob ${payload.length}\0`);
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    const raw = new Uint8Array(header.length + payload.length);
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    raw.set(header, 0);
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    raw.set(payload, header.length);
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    const compressed = await deflate(raw);
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    const result = await inflateAndParseHeader(compressed);
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    expect(result).toBeDefined();
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    expect(result?.type).toBe("blob");
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    expect(new TextDecoder().decode(result?.payload)).toBe("Hello, World!");
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  });
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});