import assert from "node:assert/strict";
import { test } from "node:test";

import { runCli } from "../src/cli.js";

function createBuffer() {
  let output = "";
  return {
    stream: {
      write(chunk: string) {
        output += chunk;
        return true;
      }
    },
    output: () => output
  };
}

test("prints usage", async () => {
  const stdout = createBuffer();
  const stderr = createBuffer();
  const code = await runCli(["--help"], { stdout: stdout.stream, stderr: stderr.stream });

  assert.equal(code, 0);
  assert.match(stdout.output(), /Commands:/);
  assert.equal(stderr.output(), "");
});

test("prints usage for bare invocation", async () => {
  const stdout = createBuffer();
  const stderr = createBuffer();
  const code = await runCli([], { stdout: stdout.stream, stderr: stderr.stream });

  assert.equal(code, 0);
  assert.match(stdout.output(), /Commands:/);
  assert.equal(stderr.output(), "");
});

test("rejects unknown command", async () => {
  const stdout = createBuffer();
  const stderr = createBuffer();
  const code = await runCli(["bogus"], { stdout: stdout.stream, stderr: stderr.stream });

  assert.equal(code, 1);
  assert.equal(stdout.output(), "");
  assert.match(stderr.output(), /Unknown command: bogus/);
});

test("dispatches known command with json flag", async () => {
  const stdout = createBuffer();
  const stderr = createBuffer();
  const code = await runCli(
    ["search", "Karma Police", "--limit", "3", "--json"],
    { stdout: stdout.stream, stderr: stderr.stream },
    {
      search(args, deps) {
        deps.stdout.write(JSON.stringify(args));
        return 0;
      }
    }
  );

  assert.equal(code, 0);
  assert.deepEqual(JSON.parse(stdout.output()), {
    command: "search",
    positional: ["Karma Police"],
    json: true,
    public: false,
    limit: "3"
  });
  assert.equal(stderr.output(), "");
});