import assert from "node:assert/strict";
import { mkdtemp, mkdir, writeFile } from "node:fs/promises";
import { tmpdir } from "node:os";
import { join } from "node:path";
import { describe, it } from "node:test";

import { resolveWebAutomationRuntime } from "../src/web-automation-runtime.js";

async function createRuntime() {
  const dir = await mkdtemp(join(tmpdir(), "amazon-shopping-runtime-"));
  await writeFile(join(dir, "check-install.js"), "console.log('ok');\n");
  await writeFile(join(dir, "package.json"), "{\"type\":\"module\"}\n");
  await mkdir(join(dir, "node_modules", ".bin"), { recursive: true });
  await writeFile(join(dir, "node_modules", ".bin", "tsx"), "#!/usr/bin/env node\n");
  return dir;
}

describe("resolveWebAutomationRuntime", () => {
  it("uses AMAZON_SHOPPING_WEB_AUTOMATION_DIR first", async () => {
    const runtimeDir = await createRuntime();
    const resolved = await resolveWebAutomationRuntime({
      env: { AMAZON_SHOPPING_WEB_AUTOMATION_DIR: runtimeDir },
      homeDir: "/missing-home",
      skillDir: "/missing-skill"
    });

    assert.equal(resolved.scriptsDir, runtimeDir);
    assert.deepEqual(resolved.checkInstall, {
      cwd: runtimeDir,
      command: "node",
      args: ["check-install.js"]
    });
  });

  it("returns a clear error when required files are missing", async () => {
    const dir = await mkdtemp(join(tmpdir(), "amazon-shopping-runtime-missing-"));
    await assert.rejects(
      () => resolveWebAutomationRuntime({
        env: { AMAZON_SHOPPING_WEB_AUTOMATION_DIR: dir },
        homeDir: "/missing-home",
        skillDir: "/missing-skill"
      }),
      /check-install.js/
    );
  });
});