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

unitTest({ perms: { env: true } }, function envSuccess(): void {
  Deno.env.set("TEST_VAR", "A");
  const env = Deno.env.toObject();
  Deno.env.set("TEST_VAR", "B");
  assertEquals(env["TEST_VAR"], "A");
  assertNotEquals(Deno.env.get("TEST_VAR"), env["TEST_VAR"]);
});

unitTest({ perms: { env: true } }, function envNotFound(): void {
  const r = Deno.env.get("env_var_does_not_exist!");
  assertEquals(r, undefined);
});

unitTest({ perms: { env: true } }, function deleteEnv(): void {
  Deno.env.set("TEST_VAR", "A");
  assertEquals(Deno.env.get("TEST_VAR"), "A");
  assertEquals(Deno.env.delete("TEST_VAR"), undefined);
  assertEquals(Deno.env.get("TEST_VAR"), undefined);
});

unitTest(function envPermissionDenied1(): void {
  assertThrows(() => {
    Deno.env.toObject();
  }, Deno.errors.PermissionDenied);
});

unitTest(function envPermissionDenied2(): void {
  assertThrows(() => {
    Deno.env.get("PATH");
  }, Deno.errors.PermissionDenied);
});

// This test verifies that on Windows, environment variables are
// case-insensitive. Case normalization needs be done using the collation
// that Windows uses, rather than naively using String.toLowerCase().
unitTest(
  {
    ignore: Deno.build.os !== "windows",
    perms: { read: true, env: true, run: true },
  },
  async function envCaseInsensitive() {
    // Utility function that runs a Deno subprocess with the environment
    // specified in `inputEnv`. The subprocess reads the environment variables
    // which are in the keys of `expectedEnv` and writes them to stdout as JSON.
    // It is then verified that these match with the values of `expectedEnv`.
    const checkChildEnv = async (
      inputEnv: Record<string, string>,
      expectedEnv: Record<string, string>,
    ): Promise<void> => {
      const src = `
      console.log(
        ${JSON.stringify(Object.keys(expectedEnv))}.map(k => Deno.env.get(k))
      )`;
      const proc = Deno.run({
        cmd: [Deno.execPath(), "eval", src],
        env: inputEnv,
        stdout: "piped",
      });
      const status = await proc.status();
      assertEquals(status.success, true);
      const expectedValues = Object.values(expectedEnv);
      const actualValues = JSON.parse(
        new TextDecoder().decode(await proc.output()),
      );
      assertEquals(actualValues, expectedValues);
      proc.close();
    };

    assertEquals(Deno.env.get("path"), Deno.env.get("PATH"));
    assertEquals(Deno.env.get("Path"), Deno.env.get("PATH"));

    // Check 'foo', 'Foo' and 'Foo' are case folded.
    await checkChildEnv({ foo: "X" }, { foo: "X", Foo: "X", FOO: "X" });

    // Check that 'µ' and 'Μ' are not case folded.
    const lc1 = "µ";
    const uc1 = lc1.toUpperCase();
    assertNotEquals(lc1, uc1);
    await checkChildEnv(
      { [lc1]: "mu", [uc1]: "MU" },
      { [lc1]: "mu", [uc1]: "MU" },
    );

    // Check that 'dž' and 'DŽ' are folded, but 'Dž' is preserved.
    const c2 = "Dž";
    const lc2 = c2.toLowerCase();
    const uc2 = c2.toUpperCase();
    assertNotEquals(c2, lc2);
    assertNotEquals(c2, uc2);
    await checkChildEnv(
      { [c2]: "Dz", [lc2]: "dz" },
      { [c2]: "Dz", [lc2]: "dz", [uc2]: "dz" },
    );
    await checkChildEnv(
      { [c2]: "Dz", [uc2]: "DZ" },
      { [c2]: "Dz", [uc2]: "DZ", [lc2]: "DZ" },
    );
  },
);

unitTest(function osPid(): void {
  assert(Deno.pid > 0);
});

unitTest(function osPpid(): void {
  assert(Deno.ppid > 0);
});

unitTest(
  { perms: { run: true, read: true } },
  async function osPpidIsEqualToPidOfParentProcess(): Promise<void> {
    const decoder = new TextDecoder();
    const process = Deno.run({
      cmd: [Deno.execPath(), "eval", "-p", "--unstable", "Deno.ppid"],
      stdout: "piped",
      env: { NO_COLOR: "true" },
    });
    const output = await process.output();
    process.close();

    const expected = Deno.pid;
    const actual = parseInt(decoder.decode(output));
    assertEquals(actual, expected);
  },
);

unitTest({ perms: { read: true } }, function execPath(): void {
  assertNotEquals(Deno.execPath(), "");
});

unitTest({ perms: { read: false } }, function execPathPerm(): void {
  assertThrows(
    () => {
      Deno.execPath();
    },
    Deno.errors.PermissionDenied,
    "read access to <exec_path>, run again with the --allow-read flag",
  );
});

unitTest({ perms: { env: true } }, function loadavgSuccess(): void {
  const load = Deno.loadavg();
  assertEquals(load.length, 3);
});

unitTest({ perms: { env: false } }, function loadavgPerm(): void {
  assertThrows(() => {
    Deno.loadavg();
  }, Deno.errors.PermissionDenied);
});

unitTest({ perms: { env: true } }, function hostnameDir(): void {
  assertNotEquals(Deno.hostname(), "");
});

unitTest({ perms: { env: false } }, function hostnamePerm(): void {
  assertThrows(() => {
    Deno.hostname();
  }, Deno.errors.PermissionDenied);
});

unitTest({ perms: { env: true } }, function releaseDir(): void {
  assertNotEquals(Deno.osRelease(), "");
});

unitTest({ perms: { env: false } }, function releasePerm(): void {
  assertThrows(() => {
    Deno.osRelease();
  }, Deno.errors.PermissionDenied);
});