import { EventEmitter } from "node:events";
import { PassThrough } from "node:stream";
import { describe, expect, test, vi } from "vitest";
import { createWindowsAuthStorageBridge } from "../src/auth/windows-auth-storage.js";

const root = "C:\\ProgramData\\ThothII\\auth";
const filename = "a".repeat(64) + ".json";

class FakeBridgeChild extends EventEmitter {
  readonly stdin = new PassThrough();
  readonly stdout = new PassThrough();
  readonly stderr = new PassThrough();
  readonly kill = vi.fn(() => true);

  close(code = 0, signal: NodeJS.Signals | null = null): void {
    this.emit("close", code, signal);
  }
}

function bridgeForChild(child: FakeBridgeChild) {
  const spawnChild = vi.fn(() => child);
  const bridge = createWindowsAuthStorageBridge({
    thtExecutable: "C:\\tht.exe",
    spawnChild,
  } as never);
  return { bridge, spawnChild };
}

describe("Windows auth-storage bridge", () => {
  test("uses hidden tht argv and sends record bytes only over bounded stdin", async () => {
    const calls: Array<{ executable: string; args: readonly string[]; input: Buffer; timeoutMs: number }> = [];
    const bridge = createWindowsAuthStorageBridge({
      thtExecutable: "C:\\Program Files\\ThothII\\tht.exe",
      invoke: async (call) => {
        calls.push(call);
        return { code: 0, stdout: Buffer.from('{"version":1,"ok":true,"created":true}\n'), stderr: Buffer.alloc(0) };
      },
    });

    await expect(bridge.create(root, "sessions", filename, Buffer.from('{"subject":"record-data"}'))).resolves.toBe(true);
    expect(calls).toHaveLength(1);
    expect(calls[0]).toMatchObject({
      executable: "C:\\Program Files\\ThothII\\tht.exe",
      args: ["_auth-storage"],
    });
    expect(JSON.stringify(calls[0].args)).not.toContain("record-data");
    expect(JSON.parse(calls[0].input.toString("utf8"))).toMatchObject({
      version: 1,
      operation: "create",
      root,
      directory: "sessions",
      filename,
      contentBase64: Buffer.from('{"subject":"record-data"}').toString("base64"),
    });
    expect(calls[0].timeoutMs).toBeGreaterThan(0);
  });

  test.each([
    { label: "nonzero", result: { code: 1, stdout: Buffer.from('{"version":1,"ok":true}\n'), stderr: Buffer.from("secret") } },
    { label: "malformed stdout", result: { code: 0, stdout: Buffer.from("not-json"), stderr: Buffer.alloc(0) } },
    { label: "unexpected stdout", result: { code: 0, stdout: Buffer.from('{"version":1,"ok":true}\nextra'), stderr: Buffer.alloc(0) } },
    { label: "unexpected JSON field", result: { code: 0, stdout: Buffer.from('{"version":1,"ok":true,"created":true,"detail":"secret"}\n'), stderr: Buffer.alloc(0) } },
  ])("fails closed on $label bridge output", async ({ result }) => {
    const bridge = createWindowsAuthStorageBridge({
      thtExecutable: "C:\\tht.exe",
      invoke: async () => result,
    });

    await expect(bridge.create(root, "sessions", filename, Buffer.from("record")))
      .rejects.toThrow("auth_session_store_invalid");
  });

  test("fails closed on a bridge timeout without disclosing request content", async () => {
    const bridge = createWindowsAuthStorageBridge({
      thtExecutable: "C:\\tht.exe",
      invoke: async () => { throw new Error("timeout secret-record"); },
    });

    await expect(bridge.create(root, "sessions", filename, Buffer.from("secret-record")))
      .rejects.toThrow("auth_session_store_invalid");
  });

  test("rejects a claimed-read response without bounded record bytes", async () => {
    const bridge = createWindowsAuthStorageBridge({
      thtExecutable: "C:\\tht.exe",
      invoke: async () => ({ code: 0, stdout: Buffer.from('{"version":1,"ok":true,"found":true}\n'), stderr: Buffer.alloc(0) }),
    });

    await expect(bridge.readClaim(root, filename)).rejects.toThrow("auth_session_store_invalid");
  });

  test("rejects an executable value that would require shell parsing", () => {
    expect(() => createWindowsAuthStorageBridge({ thtExecutable: "tht.exe && unexpected" }))
      .toThrow("auth_session_store_invalid");
  });

  test("parses the lower-camel list DTO emitted by the Go helper for a nonempty directory", async () => {
    const bridge = createWindowsAuthStorageBridge({
      thtExecutable: "C:\\tht.exe",
      invoke: async () => ({
        code: 0,
        // This is the raw JSON object emitted by authstorage.response after Go's DTO encoding.
        stdout: Buffer.from(`{"version":1,"ok":true,"entries":[{"name":"${filename}","modifiedUnixMs":1893456245000}]}\n`),
        stderr: Buffer.alloc(0),
      }),
    });

    await expect(bridge.list(root, "oidc")).resolves.toEqual([
      { name: filename, modifiedUnixMs: 1_893_456_245_000 },
    ]);
  });

  test("aborts a stdin-closed looping helper on timeout and waits for close", async () => {
    vi.useFakeTimers();
    const child = new FakeBridgeChild();
    const { bridge, spawnChild } = bridgeForChild(child);
    const pending = bridge.list(root, "sessions");
    const outcome = pending.then(() => "resolved", () => "rejected");
    try {
      await vi.advanceTimersByTimeAsync(5_000);
      expect(spawnChild).toHaveBeenCalledOnce();
      expect(child.kill).toHaveBeenCalledOnce();
      expect(child.stdin.destroyed).toBe(true);
      await expect(Promise.race([outcome, Promise.resolve("pending")])).resolves.toBe("pending");

      child.close();
      await expect(outcome).resolves.toBe("rejected");
    } finally {
      child.close();
      vi.useRealTimers();
    }
  });

  test.each(["stdout", "stderr"] as const)("aborts a %s-flooding helper and waits for close", async (stream) => {
    const child = new FakeBridgeChild();
    const { bridge, spawnChild } = bridgeForChild(child);
    const pending = bridge.list(root, "sessions");
    const outcome = pending.then(() => "resolved", () => "rejected");
    await Promise.resolve();
    expect(spawnChild).toHaveBeenCalledOnce();

    child[stream].write(Buffer.alloc(64 * 1024 + 1));
    await Promise.resolve();
    expect(child.kill).toHaveBeenCalledOnce();
    expect(child.stdin.destroyed).toBe(true);
    await expect(Promise.race([outcome, Promise.resolve("pending")])).resolves.toBe("pending");

    child.close();
    await expect(outcome).resolves.toBe("rejected");
  });

  test("aborts a helper when its stdin errors and waits for termination", async () => {
    const child = new FakeBridgeChild();
    const { bridge, spawnChild } = bridgeForChild(child);
    const stdinErrored = new Promise<void>((resolve) => child.stdin.once("error", () => resolve()));
    child.stdin.once("finish", () => child.stdin.destroy(new Error("stdin failure")));
    const pending = bridge.list(root, "sessions");
    const outcome = pending.then(() => "resolved", () => "rejected");
    await Promise.resolve();
    expect(spawnChild).toHaveBeenCalledOnce();

    await stdinErrored;
    expect(child.kill).toHaveBeenCalledOnce();
    child.close();
    await expect(outcome).resolves.toBe("rejected");
  });

  test("aborts an errored child exactly once and waits for its close event", async () => {
    const child = new FakeBridgeChild();
    const { bridge, spawnChild } = bridgeForChild(child);
    const pending = bridge.list(root, "sessions");
    const outcome = pending.then(() => "resolved", () => "rejected");
    await Promise.resolve();
    expect(spawnChild).toHaveBeenCalledOnce();

    child.emit("error", new Error("helper error"));
    child.emit("error", new Error("duplicate helper error"));
    expect(child.kill).toHaveBeenCalledOnce();
    await expect(Promise.race([outcome, Promise.resolve("pending")])).resolves.toBe("pending");
    child.close();
    await expect(outcome).resolves.toBe("rejected");
  });

  test("fails closed when launching the helper throws before a child exists", async () => {
    const bridge = createWindowsAuthStorageBridge({
      thtExecutable: "C:\\tht.exe",
      spawnChild: () => { throw new Error("launch detail must not escape"); },
    });

    await expect(bridge.list(root, "sessions")).rejects.toThrow("auth_session_store_invalid");
  });
});