import { EventEmitter } from "node:events";
import { existsSync, mkdtempSync, rmSync } from "node:fs";
import { tmpdir } from "node:os";
import { join } from "node:path";
import { PassThrough } from "node:stream";
import type { ChildProcessWithoutNullStreams } from "node:child_process";
import type { Client, ClientConfig } from "pg";
import { afterEach, expect, test, vi } from "vitest";
import {
  buildSshArguments,
  ConcreteCatalogPostgresAccess,
} from "../src/catalog/postgres-access.js";
import { CATALOG_SECRET_IDS } from "../src/catalog/secrets.js";
import type { WorkspaceDatabase } from "../src/catalog/types.js";
import { WorkspaceSecretStore } from "../src/workspaces/secret-store.js";

const roots: string[] = [];

afterEach(() => {
  for (const root of roots.splice(0)) rmSync(root, { recursive: true, force: true });
});

function secretStore() {
  const root = mkdtempSync(join(tmpdir(), "catalog-ssh-secrets-"));
  const runtimeRoot = mkdtempSync(join(tmpdir(), "catalog-ssh-runtime-"));
  roots.push(root, runtimeRoot);
  return new WorkspaceSecretStore({ root, runtimeRoot, installationId: "test" });
}

function sshDatabase(): WorkspaceDatabase {
  return {
    id: "11111111-1111-4111-8111-111111111111",
    workspaceId: "psd-clinical",
    engine: "postgres",
    databaseName: "warehouse",
    schema: "datawarehouse",
    version: 4,
    createdAt: "2026-08-27T08:00:00Z",
    updatedAt: "2026-08-27T09:00:00Z",
    connectionStatus: "reachable",
    binding: {
      transport: "ssh_tunnel",
      username: "warehouse_reader",
      sshHost: "bastion.internal",
      sshPort: 2222,
      sshUsername: "tunnel_user",
      sshTargetHost: "postgres.internal",
      sshTargetPort: 5432,
      tlsServername: "postgres.internal",
    },
  };
}

function fakeChild(): ChildProcessWithoutNullStreams {
  const child = new EventEmitter() as EventEmitter & {
    stdin: PassThrough;
    stdout: PassThrough;
    stderr: PassThrough;
    exitCode: number | null;
    signalCode: NodeJS.Signals | null;
    kill: (signal?: NodeJS.Signals | number) => boolean;
  };
  child.stdin = new PassThrough();
  child.stdout = new PassThrough();
  child.stderr = new PassThrough();
  child.exitCode = null;
  child.signalCode = null;
  child.kill = vi.fn((signal: NodeJS.Signals | number = "SIGTERM") => {
    child.signalCode = typeof signal === "string" ? signal : "SIGTERM";
    child.emit("exit", null, child.signalCode);
    return true;
  });
  return child as unknown as ChildProcessWithoutNullStreams;
}

test("builds a strict host-verified OpenSSH stdio tunnel", () => {
  const args = buildSshArguments({
    sshHost: "bastion.internal",
    sshPort: 2222,
    sshUsername: "tunnel_user",
    targetHost: "postgres.internal",
    targetPort: 5432,
    privateKeyFile: "/runtime/id",
    knownHostsFile: "/runtime/known_hosts",
    passphraseFile: "/runtime/passphrase",
    connectTimeoutMs: 5_001,
  });

  expect(args).toEqual(expect.arrayContaining([
    "-F", "/dev/null",
    "-o", "BatchMode=no",
    "-o", "StrictHostKeyChecking=yes",
    "-o", "UserKnownHostsFile=/runtime/known_hosts",
    "-o", "GlobalKnownHostsFile=/dev/null",
    "-o", "IdentitiesOnly=yes",
    "-o", "IdentityAgent=none",
    "-o", "PasswordAuthentication=no",
    "-o", "KbdInteractiveAuthentication=no",
    "-o", "ConnectTimeout=6",
    "-W", "postgres.internal:5432",
    "--", "tunnel_user@bastion.internal",
  ]));
});

test("connects pg through OpenSSH, supplies askpass, and releases all secret leases", async () => {
  const store = secretStore();
  store.putMany("psd-clinical", {
    [CATALOG_SECRET_IDS.password]: "db-password ",
    [CATALOG_SECRET_IDS.sshPrivateKey]: "PRIVATE KEY\n",
    [CATALOG_SECRET_IDS.sshPrivateKeyPassphrase]: "key-passphrase",
    [CATALOG_SECRET_IDS.sshKnownHosts]: "bastion.internal ssh-ed25519 AAAATEST\n",
    [CATALOG_SECRET_IDS.tlsCa]: "CA CERTIFICATE\n",
  });
  const child = fakeChild();
  let clientConfig: ClientConfig | undefined;
  let spawnCall: { command: string; args: readonly string[]; env: NodeJS.ProcessEnv } | undefined;
  const end = vi.fn(async () => undefined);
  const query = vi.fn(async () => ({ rows: [{ ok: true }] }));
  const connect = vi.fn(async () => undefined);

  const access = new ConcreteCatalogPostgresAccess(store, {
    sshBinary: "/usr/bin/ssh",
    askpassPath: "/app/ssh-askpass.mjs",
    connectTimeoutMs: 5_000,
    spawnSsh: (command, args, options) => {
      spawnCall = { command, args, env: options.env };
      return child;
    },
    createClient: (config) => {
      clientConfig = config;
      return { connect, query, end } as unknown as Client;
    },
  });

  const client = await access.connect(sshDatabase(), new AbortController().signal);
  expect(connect).toHaveBeenCalledOnce();
  expect(clientConfig).toMatchObject({
    host: "postgres.internal",
    port: 5432,
    database: "warehouse",
    user: "warehouse_reader",
    password: "db-password ",
    connectionTimeoutMillis: 5_000,
    ssl: {
      ca: "CA CERTIFICATE\n",
      servername: "postgres.internal",
      rejectUnauthorized: true,
    },
  });
  expect(clientConfig?.stream).toBeTypeOf("function");
  expect(spawnCall?.command).toBe("/usr/bin/ssh");
  expect(spawnCall?.args.some((argument) => argument.startsWith("IdentityFile="))).toBe(true);
  expect(spawnCall?.args.some((argument) => argument.startsWith("UserKnownHostsFile="))).toBe(true);
  expect(spawnCall?.env).toMatchObject({
    DISPLAY: "thothii",
    SSH_ASKPASS: "/app/ssh-askpass.mjs",
    SSH_ASKPASS_REQUIRE: "force",
  });
  const leasedPaths = spawnCall!.args
    .filter((argument) => argument.startsWith("IdentityFile=") || argument.startsWith("UserKnownHostsFile="))
    .map((argument) => argument.slice(argument.indexOf("=") + 1));
  leasedPaths.push(spawnCall!.env.THT_SSH_PASSPHRASE_FILE!);
  expect(leasedPaths.every(existsSync)).toBe(true);

  await expect(client.query("SELECT 1", [])).resolves.toEqual({ rows: [{ ok: true }] });
  await client.end();

  expect(end).toHaveBeenCalledOnce();
  expect(child.kill).toHaveBeenCalledWith("SIGTERM");
  expect(leasedPaths.some(existsSync)).toBe(false);
});