// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
import { unitTest, assertEquals, assert } from "./test_util.ts";

// chown on Windows is noop for now, so ignore its testing on Windows
if (Deno.build.os !== "win") {
  async function getUidAndGid(): Promise<{ uid: number; gid: number }> {
    // get the user ID and group ID of the current process
    const uidProc = Deno.run({
      stdout: "piped",
      cmd: ["python", "-c", "import os; print(os.getuid())"],
    });
    const gidProc = Deno.run({
      stdout: "piped",
      cmd: ["python", "-c", "import os; print(os.getgid())"],
    });

    assertEquals((await uidProc.status()).code, 0);
    assertEquals((await gidProc.status()).code, 0);
    const uid = parseInt(
      new TextDecoder("utf-8").decode(await uidProc.output())
    );
    uidProc.close();
    const gid = parseInt(
      new TextDecoder("utf-8").decode(await gidProc.output())
    );
    gidProc.close();

    return { uid, gid };
  }

  unitTest(async function chownNoWritePermission(): Promise<void> {
    const filePath = "chown_test_file.txt";
    try {
      await Deno.chown(filePath, 1000, 1000);
    } catch (e) {
      assert(e instanceof Deno.errors.PermissionDenied);
    }
  });

  unitTest(
    { perms: { run: true, write: true } },
    async function chownSyncFileNotExist(): Promise<void> {
      const { uid, gid } = await getUidAndGid();
      const filePath = Deno.makeTempDirSync() + "/chown_test_file.txt";

      try {
        Deno.chownSync(filePath, uid, gid);
      } catch (e) {
        assert(e instanceof Deno.errors.NotFound);
      }
    }
  );

  unitTest(
    { perms: { run: true, write: true } },
    async function chownFileNotExist(): Promise<void> {
      const { uid, gid } = await getUidAndGid();
      const filePath = (await Deno.makeTempDir()) + "/chown_test_file.txt";

      try {
        await Deno.chown(filePath, uid, gid);
      } catch (e) {
        assert(e instanceof Deno.errors.NotFound);
      }
    }
  );

  unitTest(
    { perms: { write: true } },
    function chownSyncPermissionDenied(): void {
      const enc = new TextEncoder();
      const dirPath = Deno.makeTempDirSync();
      const filePath = dirPath + "/chown_test_file.txt";
      const fileData = enc.encode("Hello");
      Deno.writeFileSync(filePath, fileData);

      try {
        // try changing the file's owner to root
        Deno.chownSync(filePath, 0, 0);
      } catch (e) {
        assert(e instanceof Deno.errors.PermissionDenied);
      }
      Deno.removeSync(dirPath, { recursive: true });
    }
  );

  unitTest(
    { perms: { write: true } },
    async function chownPermissionDenied(): Promise<void> {
      const enc = new TextEncoder();
      const dirPath = await Deno.makeTempDir();
      const filePath = dirPath + "/chown_test_file.txt";
      const fileData = enc.encode("Hello");
      await Deno.writeFile(filePath, fileData);

      try {
        // try changing the file's owner to root
        await Deno.chown(filePath, 0, 0);
      } catch (e) {
        assert(e instanceof Deno.errors.PermissionDenied);
      }
      await Deno.remove(dirPath, { recursive: true });
    }
  );

  unitTest(
    { perms: { run: true, write: true } },
    async function chownSyncSucceed(): Promise<void> {
      // TODO: when a file's owner is actually being changed,
      // chown only succeeds if run under priviledged user (root)
      // The test script has no such priviledge, so need to find a better way to test this case
      const { uid, gid } = await getUidAndGid();

      const enc = new TextEncoder();
      const dirPath = Deno.makeTempDirSync();
      const filePath = dirPath + "/chown_test_file.txt";
      const fileData = enc.encode("Hello");
      Deno.writeFileSync(filePath, fileData);

      // the test script creates this file with the same uid and gid,
      // here chown is a noop so it succeeds under non-priviledged user
      Deno.chownSync(filePath, uid, gid);

      Deno.removeSync(dirPath, { recursive: true });
    }
  );

  unitTest(
    { perms: { run: true, write: true } },
    async function chownSucceed(): Promise<void> {
      // TODO: same as chownSyncSucceed
      const { uid, gid } = await getUidAndGid();

      const enc = new TextEncoder();
      const dirPath = await Deno.makeTempDir();
      const filePath = dirPath + "/chown_test_file.txt";
      const fileData = enc.encode("Hello");
      await Deno.writeFile(filePath, fileData);

      // the test script creates this file with the same uid and gid,
      // here chown is a noop so it succeeds under non-priviledged user
      await Deno.chown(filePath, uid, gid);

      Deno.removeSync(dirPath, { recursive: true });
    }
  );
}