import assert from "node:assert/strict";
import { EventEmitter } from "node:events";
import { SpawnOptions } from "node:child_process";
import test from "node:test";

import { killProcessTree } from "../main/nodecg/process-killer";

test("killProcessTree validates pid before building Windows taskkill command", () => {
  const spawnCalls: Array<{ command: string; args: string[]; options: SpawnOptions }> = [];

  const killed = killProcessTree(Number.NaN, "SIGTERM", {
    platform: "win32",
    spawnProcess: (command, args, options) => {
      spawnCalls.push({ command, args, options });
      return new EventEmitter() as import("node:child_process").ChildProcess;
    },
    killProcess: () => undefined,
    log: () => undefined,
  });

  assert.equal(killed, false);
  assert.deepEqual(spawnCalls, []);
});

test("killProcessTree builds a narrow Windows taskkill invocation", () => {
  const spawnCalls: Array<{ command: string; args: string[]; options: SpawnOptions }> = [];

  const killed = killProcessTree(1234, "SIGKILL", {
    platform: "win32",
    spawnProcess: (command, args, options) => {
      spawnCalls.push({ command, args, options });
      return new EventEmitter() as import("node:child_process").ChildProcess;
    },
    killProcess: () => undefined,
    log: () => undefined,
  });

  assert.equal(killed, true);
  assert.equal(spawnCalls[0]?.command, "taskkill");
  assert.deepEqual(spawnCalls[0]?.args, ["/pid", "1234", "/T", "/F"]);
  assert.equal(spawnCalls[0]?.options.shell, false);
  assert.equal(spawnCalls[0]?.options.windowsHide, true);
});

test("killProcessTree falls back from POSIX process group to child pid", () => {
  const killCalls: Array<{ pid: number; signal: NodeJS.Signals }> = [];

  const killed = killProcessTree(1234, "SIGTERM", {
    platform: "linux",
    spawnProcess: () => new EventEmitter() as import("node:child_process").ChildProcess,
    killProcess: (pid, signal) => {
      killCalls.push({ pid, signal });
      if (pid < 0) {
        throw new Error("process group unavailable");
      }
    },
    log: () => undefined,
  });

  assert.equal(killed, true);
  assert.deepEqual(killCalls, [
    { pid: -1234, signal: "SIGTERM" },
    { pid: 1234, signal: "SIGTERM" },
  ]);
});