"""Tests for the server module."""

import asyncio
from unittest.mock import AsyncMock, MagicMock, patch

import pytest

from mudlib import server


def test_port_constant():
    assert server.PORT == 6789
    assert isinstance(server.PORT, int)


def test_shell_exists():
    assert callable(server.shell)
    assert asyncio.iscoroutinefunction(server.shell)


def test_run_server_exists():
    assert callable(server.run_server)
    assert asyncio.iscoroutinefunction(server.run_server)


@pytest.mark.asyncio
async def test_shell_greets_and_echoes():
    reader = AsyncMock()
    writer = MagicMock()
    writer.is_closing.return_value = False
    writer.drain = AsyncMock()
    writer.close = MagicMock()

    readline = "mudlib.server.readline2"
    with patch(readline, new_callable=AsyncMock) as mock_readline:
        mock_readline.side_effect = ["hello", "quit"]
        await server.shell(reader, writer)

    calls = [str(call) for call in writer.write.call_args_list]
    assert any("Welcome" in call for call in calls)
    assert any("hello" in call for call in calls)
    assert any("Goodbye" in call for call in calls)
    writer.close.assert_called_once()


@pytest.mark.asyncio
async def test_shell_handles_eof():
    reader = AsyncMock()
    writer = MagicMock()
    writer.is_closing.return_value = False
    writer.drain = AsyncMock()
    writer.close = MagicMock()

    readline = "mudlib.server.readline2"
    with patch(readline, new_callable=AsyncMock) as mock_readline:
        mock_readline.return_value = None
        await server.shell(reader, writer)

    writer.close.assert_called_once()


@pytest.mark.asyncio
async def test_shell_handles_quit():
    reader = AsyncMock()
    writer = MagicMock()
    writer.is_closing.return_value = False
    writer.drain = AsyncMock()
    writer.close = MagicMock()

    readline = "mudlib.server.readline2"
    with patch(readline, new_callable=AsyncMock) as mock_readline:
        mock_readline.return_value = "quit"
        await server.shell(reader, writer)

    calls = [str(call) for call in writer.write.call_args_list]
    assert any("Goodbye" in call for call in calls)
    writer.close.assert_called_once()