import test from "node:test";
import assert from "node:assert/strict";
import { execFileSync } from "node:child_process";
import { existsSync, readFileSync } from "node:fs";
import { dirname, resolve } from "node:path";
import { fileURLToPath } from "node:url";

const packageRoot = resolve(dirname(fileURLToPath(import.meta.url)), "..");
const pkg = JSON.parse(readFileSync(resolve(packageRoot, "package.json"), "utf8"));
const readme = readFileSync(resolve(packageRoot, "README.md"), "utf8");

function getPackedPaths() {
  const output = execFileSync("npm", ["pack", "--dry-run", "--json"], {
    cwd: packageRoot,
    encoding: "utf8",
  });
  const [packResult] = JSON.parse(output) as Array<{ files: Array<{ path: string }> }>;
  return packResult.files.map((file) => file.path);
}

test("package.json exposes pi-context-manager as a standalone pi package", () => {
  assert.equal(pkg.name, "pi-context-manager");
  assert.equal(pkg.type, "module");
  assert.equal(
    pkg.description,
    "Pi extension package for context-pressure management, snapshots, resume packets, and branch-summary compaction behavior.",
  );
  assert.ok(Array.isArray(pkg.keywords));
  assert.ok(pkg.keywords.includes("pi-package"));
  assert.deepEqual(pkg.repository, {
    type: "git",
    url: "https://gitea.rwiesner.com/pi/pi-context-manager",
  });
  assert.deepEqual(pkg.pi, {
    extensions: ["./index.ts"],
  });
  assert.equal(pkg.scripts.test, "tsx --test src/*.test.ts");

  assert.equal(pkg.peerDependencies["@mariozechner/pi-agent-core"], "*");
  assert.equal(pkg.peerDependencies["@mariozechner/pi-coding-agent"], "*");
  assert.deepEqual(pkg.dependencies ?? {}, {});
  assert.equal(pkg.bundledDependencies, undefined);
  assert.deepEqual(pkg.files, ["index.ts", "src"]);

  assert.ok(existsSync(resolve(packageRoot, "index.ts")));
  assert.ok(existsSync(resolve(packageRoot, "src/runtime.ts")));
});

test("README documents local and git installation", () => {
  assert.match(readme, /pi install \/absolute\/path\/to\/context-manager/);
  assert.match(readme, /pi install https:\/\/gitea\.rwiesner\.com\/pi\/pi-context-manager/);
});

test("npm pack includes runtime package assets", () => {
  const packedPaths = getPackedPaths();

  assert.ok(packedPaths.includes("README.md"));
  assert.ok(packedPaths.includes("package.json"));
  assert.ok(packedPaths.includes("index.ts"));
  assert.ok(packedPaths.includes("src/runtime.ts"));
});