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

function defer(n: number): Promise<void> {
  return new Promise((resolve: () => void, _) => {
    setTimeout(resolve, n);
  });
}

if (Deno.build.os === "win") {
  test(async function signalsNotImplemented(): Promise<void> {
    assertThrows(
      () => {
        Deno.signal(1);
      },
      Error,
      "not implemented"
    );
    assertThrows(
      () => {
        Deno.signals.alarm(); // for SIGALRM
      },
      Error,
      "not implemented"
    );
    assertThrows(
      () => {
        Deno.signals.child(); // for SIGCHLD
      },
      Error,
      "not implemented"
    );
    assertThrows(
      () => {
        Deno.signals.hungup(); // for SIGHUP
      },
      Error,
      "not implemented"
    );
    assertThrows(
      () => {
        Deno.signals.interrupt(); // for SIGINT
      },
      Error,
      "not implemented"
    );
    assertThrows(
      () => {
        Deno.signals.io(); // for SIGIO
      },
      Error,
      "not implemented"
    );
    assertThrows(
      () => {
        Deno.signals.pipe(); // for SIGPIPE
      },
      Error,
      "not implemented"
    );
    assertThrows(
      () => {
        Deno.signals.quit(); // for SIGQUIT
      },
      Error,
      "not implemented"
    );
    assertThrows(
      () => {
        Deno.signals.terminate(); // for SIGTERM
      },
      Error,
      "not implemented"
    );
    assertThrows(
      () => {
        Deno.signals.userDefined1(); // for SIGUSR1
      },
      Error,
      "not implemented"
    );
    assertThrows(
      () => {
        Deno.signals.userDefined2(); // for SIGURS2
      },
      Error,
      "not implemented"
    );
    assertThrows(
      () => {
        Deno.signals.windowChange(); // for SIGWINCH
      },
      Error,
      "not implemented"
    );
  });
} else {
  testPerm({ run: true, net: true }, async function signalStreamTest(): Promise<
    void
  > {
    // This prevents the program from exiting.
    const t = setInterval(() => {}, 1000);

    let c = 0;
    const sig = Deno.signal(Deno.Signal.SIGUSR1);

    setTimeout(async () => {
      await defer(20);
      for (const _ of Array(3)) {
        // Sends SIGUSR1 3 times.
        Deno.kill(Deno.pid, Deno.Signal.SIGUSR1);
        await defer(20);
      }
      sig.dispose();
    });

    for await (const _ of sig) {
      c += 1;
    }

    assertEquals(c, 3);

    clearTimeout(t);
  });

  testPerm(
    { run: true, net: true },
    async function signalPromiseTest(): Promise<void> {
      // This prevents the program from exiting.
      const t = setInterval(() => {}, 1000);

      const sig = Deno.signal(Deno.Signal.SIGUSR1);
      setTimeout(() => {
        Deno.kill(Deno.pid, Deno.Signal.SIGUSR1);
      }, 20);
      await sig;
      sig.dispose();

      clearTimeout(t);
    }
  );

  testPerm({ run: true }, async function signalShorthandsTest(): Promise<void> {
    let s: Deno.SignalStream;
    s = Deno.signals.alarm(); // for SIGALRM
    assert(s instanceof Deno.SignalStream);
    s.dispose();
    s = Deno.signals.child(); // for SIGCHLD
    assert(s instanceof Deno.SignalStream);
    s.dispose();
    s = Deno.signals.hungup(); // for SIGHUP
    assert(s instanceof Deno.SignalStream);
    s.dispose();
    s = Deno.signals.interrupt(); // for SIGINT
    assert(s instanceof Deno.SignalStream);
    s.dispose();
    s = Deno.signals.io(); // for SIGIO
    assert(s instanceof Deno.SignalStream);
    s.dispose();
    s = Deno.signals.pipe(); // for SIGPIPE
    assert(s instanceof Deno.SignalStream);
    s.dispose();
    s = Deno.signals.quit(); // for SIGQUIT
    assert(s instanceof Deno.SignalStream);
    s.dispose();
    s = Deno.signals.terminate(); // for SIGTERM
    assert(s instanceof Deno.SignalStream);
    s.dispose();
    s = Deno.signals.userDefined1(); // for SIGUSR1
    assert(s instanceof Deno.SignalStream);
    s.dispose();
    s = Deno.signals.userDefined2(); // for SIGURS2
    assert(s instanceof Deno.SignalStream);
    s.dispose();
    s = Deno.signals.windowChange(); // for SIGWINCH
    assert(s instanceof Deno.SignalStream);
    s.dispose();
  });
}