"""Tests for IPC protocol JSON-line encoding/decoding."""

import io
import json

from voice_to_notes.ipc.messages import IPCMessage
from voice_to_notes.ipc.protocol import read_message, write_message


def test_write_message(capsys):
    msg = IPCMessage(id="req-1", type="pong", payload={"ok": True})
    write_message(msg)
    captured = capsys.readouterr()
    parsed = json.loads(captured.out.strip())
    assert parsed["id"] == "req-1"
    assert parsed["type"] == "pong"
    assert parsed["payload"]["ok"] is True


def test_read_message(monkeypatch):
    line = json.dumps({"id": "req-1", "type": "ping", "payload": {}}) + "\n"
    monkeypatch.setattr("sys.stdin", io.StringIO(line))
    msg = read_message()
    assert msg is not None
    assert msg.id == "req-1"
    assert msg.type == "ping"


def test_read_message_eof(monkeypatch):
    monkeypatch.setattr("sys.stdin", io.StringIO(""))
    msg = read_message()
    assert msg is None


def test_read_message_invalid_json(monkeypatch):
    monkeypatch.setattr("sys.stdin", io.StringIO("not json\n"))
    msg = read_message()
    assert msg is None