import { readFile } from "node:fs/promises";
import { join } from "node:path";

import { describe, expect } from "vitest";

import { createTestTempDirectory } from "../../fixtures/temporaryDirectory.js";
import {
  processTest as it,
  waitForExit,
} from "../../support/process/processFixture.js";

import {
  BROWSER_DEVTOOLS_STARTUP_TIMEOUT_MS,
  BrowserStartupError,
  waitForBrowserDevtoolsPort,
} from "../../../src/browser/BrowserProcessStartup.js";
import { assertOrdinaryWindowsVerifierCaller } from "../../../scripts/lib/windows-ordinary-user-verifier.mjs";

describe("browser process startup", () => {
  it("requires a positively observed ordinary Windows verifier caller", () => {
    expect(() =>
      assertOrdinaryWindowsVerifierCaller({
        administrator: false,
        elevated: false,
        integrityLevel: 8192,
      }),
    ).not.toThrow();

    for (const token of [
      { administrator: true, elevated: false },
      { administrator: false, elevated: true },
      { administrator: false },
      { administrator: false, elevated: null },
      null,
    ]) {
      expect(() => assertOrdinaryWindowsVerifierCaller(token)).toThrow(
        /ordinary, non-elevated user token/u,
      );
    }
  });

  it("returns a delayed valid DevToolsActivePort", async ({ processes }) => {
    const root = await temporaryRoot();
    const portPath = join(root, "DevToolsActivePort");
    const child = processes.spawn(process.execPath, [
      "-e",
      `setTimeout(() => require("node:fs").writeFileSync(${JSON.stringify(portPath)}, "43117\\n/browser"), 20); setTimeout(() => {}, 1000)`,
    ]);
    try {
      await expect(
        waitForBrowserDevtoolsPort({
          child,
          executable: process.execPath,
          activePortPath: portPath,
          stderr: () => "",
          timeoutMs: 1_000,
          pollIntervalMs: 5,
        }),
      ).resolves.toBe(43_117);
    } finally {
      child.kill("SIGKILL");
      expect(await waitForExit(child, 5_000)).toBe(true);
    }
  });

  it("classifies signal termination instead of timing out", async ({
    processes,
  }) => {
    const root = await temporaryRoot();
    const child = processes.spawn(process.execPath, [
      "-e",
      "process.kill(process.pid, 'SIGTERM')",
    ]);

    const failure = await waitForBrowserDevtoolsPort({
      child,
      executable: process.execPath,
      activePortPath: join(root, "DevToolsActivePort"),
      stderr: () => "signal fixture",
      timeoutMs: 1_000,
      pollIntervalMs: 5,
    }).catch((cause: unknown) => cause);

    expect(failure).toBeInstanceOf(BrowserStartupError);
    expect(failure).toMatchObject({
      failure: "signalled",
      exitCode: null,
      signalCode: "SIGTERM",
      stderr: "signal fixture",
    });
  });

  it("reports bounded timeout diagnostics", async ({ processes }) => {
    const root = await temporaryRoot();
    const child = processes.spawn(process.execPath, [
      "-e",
      "setTimeout(() => {}, 1000)",
    ]);
    try {
      const failure = await waitForBrowserDevtoolsPort({
        child,
        executable: process.execPath,
        activePortPath: join(root, "DevToolsActivePort"),
        stderr: () => "",
        timeoutMs: 20,
        pollIntervalMs: 5,
      }).catch((cause: unknown) => cause);

      expect(failure).toBeInstanceOf(BrowserStartupError);
      expect(failure).toMatchObject({
        failure: "timeout",
        exitCode: null,
        signalCode: null,
        startupTimeoutMs: 20,
      });
      expect(String(failure)).toContain("stderr=<empty>");
      expect(String(failure)).toContain("startup_timeout_ms=20");
    } finally {
      child.kill("SIGKILL");
      expect(await waitForExit(child, 5_000)).toBe(true);
    }
  });

  it("names the owner's deadline when a caller omits one", async ({
    processes,
  }) => {
    const root = await temporaryRoot();
    const child = processes.spawn(process.execPath, [
      "-e",
      "setTimeout(() => process.exit(3), 10)",
    ]);

    const failure = await waitForBrowserDevtoolsPort({
      child,
      executable: process.execPath,
      activePortPath: join(root, "DevToolsActivePort"),
      stderr: () => "owner default fixture",
      pollIntervalMs: 5,
    }).catch((cause: unknown) => cause);

    expect(failure).toBeInstanceOf(BrowserStartupError);
    expect(failure).toMatchObject({
      failure: "exited",
      startupTimeoutMs: BROWSER_DEVTOOLS_STARTUP_TIMEOUT_MS,
    });
    expect(String(failure)).toContain(
      `startup_timeout_ms=${String(BROWSER_DEVTOOLS_STARTUP_TIMEOUT_MS)}`,
    );
  });

  it("keeps one owner for the DevToolsActivePort deadline", async () => {
    expect(BROWSER_DEVTOOLS_STARTUP_TIMEOUT_MS).toBe(60_000);
    const callers = [
      "../../../scripts/verify-real-browser.mjs",
      "../../../scripts/lib/browser-runtime-fixture-lifecycle.mjs",
    ];
    for (const caller of callers) {
      const source = await readFile(new URL(caller, import.meta.url), "utf8");
      expect(devtoolsPortDeadlines(source)).toEqual([
        ["BROWSER_DEVTOOLS_STARTUP_TIMEOUT_MS"],
      ]);
    }
  });
});

const temporaryRoot = async (): Promise<string> => {
  return createTestTempDirectory("rea-browser-startup-");
};

const devtoolsPortDeadlines = (source: string): string[][] => {
  const calls = /waitForBrowserDevtoolsPort\(\{(?<body>[\s\S]*?)\}\)/gu;
  const deadlines = /\btimeoutMs:\s*(?<value>[^\n,]+)/gu;
  return [...source.matchAll(calls)].map((call) =>
    [...String(call.groups?.body).matchAll(deadlines)].map((deadline) =>
      String(deadline.groups?.value).trim(),
    ),
  );
};