"""Tests for IF session management."""

from unittest.mock import AsyncMock, MagicMock, patch

import pytest

from mudlib.if_session import IFResponse, IFSession


@pytest.mark.asyncio
async def test_if_response_dataclass():
    """IFResponse dataclass can be created."""
    response = IFResponse(output="test output", done=False)
    assert response.output == "test output"
    assert response.done is False


@pytest.mark.asyncio
async def test_if_response_done():
    """IFResponse can signal completion."""
    response = IFResponse(output="", done=True)
    assert response.done is True


@pytest.mark.asyncio
async def test_if_session_init():
    """IFSession can be initialized."""
    player = MagicMock()
    session = IFSession(player, "/path/to/story.z5", "story")
    assert session.player == player
    assert session.story_path == "/path/to/story.z5"
    assert session.game_name == "story"
    assert session.process is None


@pytest.mark.asyncio
async def test_if_session_init_infers_game_name():
    """IFSession infers game_name from story_path if not provided."""
    player = MagicMock()
    session = IFSession(player, "/path/to/zork.z5")
    assert session.game_name == "zork"


@pytest.mark.asyncio
async def test_start_spawns_subprocess_and_returns_intro():
    """start() spawns dfrotz subprocess and returns intro text."""
    player = MagicMock()
    session = IFSession(player, "/path/to/story.z5")

    # Mock the subprocess
    mock_process = AsyncMock()
    mock_process.stdout = AsyncMock()
    mock_process.stdin = AsyncMock()

    # Simulate dfrotz output: intro text followed by ">" prompt
    intro_bytes = b"Welcome to the story!\nYou are in a room.\n>"

    async def read_side_effect(n):
        nonlocal intro_bytes
        if intro_bytes:
            byte = intro_bytes[:1]
            intro_bytes = intro_bytes[1:]
            return byte
        return b""

    mock_process.stdout.read = AsyncMock(side_effect=read_side_effect)

    with patch("asyncio.create_subprocess_exec", return_value=mock_process):
        intro = await session.start()

    assert session.process == mock_process
    assert "Welcome to the story!" in intro
    assert "You are in a room." in intro
    # The prompt should be stripped from the output
    assert intro.strip().endswith("room.")


@pytest.mark.asyncio
async def test_handle_input_sends_to_dfrotz():
    """handle_input() sends regular input to dfrotz and returns response."""
    player = MagicMock()
    session = IFSession(player, "/path/to/story.z5")

    # Mock process
    mock_process = MagicMock()
    mock_process.stdin = MagicMock()
    mock_process.stdin.write = MagicMock()
    mock_process.stdin.drain = AsyncMock()
    mock_process.stdout = AsyncMock()
    session.process = mock_process

    # Simulate dfrotz response
    response_bytes = b"You move north.\n>"

    async def read_side_effect(n):
        nonlocal response_bytes
        if response_bytes:
            byte = response_bytes[:1]
            response_bytes = response_bytes[1:]
            return byte
        return b""

    mock_process.stdout.read = AsyncMock(side_effect=read_side_effect)

    response = await session.handle_input("north")

    assert response.output == "You move north."
    assert response.done is False
    # Verify stdin.write was called
    mock_process.stdin.write.assert_called()
    mock_process.stdin.drain.assert_called()


@pytest.mark.asyncio
async def test_handle_input_quit_returns_done():
    """handle_input('::quit') returns done=True without sending to dfrotz."""
    player = MagicMock()
    session = IFSession(player, "/path/to/story.z5")

    # Mock process
    mock_process = AsyncMock()
    mock_process.stdin = AsyncMock()
    session.process = mock_process

    response = await session.handle_input("::quit")

    assert response.done is True
    # Should NOT have written to dfrotz stdin
    mock_process.stdin.write.assert_not_called()


@pytest.mark.asyncio
async def test_handle_input_help_returns_help_text():
    """handle_input('::help') returns help text listing escape commands."""
    player = MagicMock()
    session = IFSession(player, "/path/to/story.z5")
    session.process = AsyncMock()

    response = await session.handle_input("::help")

    assert response.done is False
    assert "::quit" in response.output
    assert "::help" in response.output


@pytest.mark.asyncio
async def test_stop_terminates_subprocess():
    """stop() terminates the dfrotz process."""
    player = MagicMock()
    session = IFSession(player, "/path/to/story.z5")

    # Mock process
    mock_process = MagicMock()
    mock_process.returncode = None
    mock_process.terminate = MagicMock()
    mock_process.wait = AsyncMock()
    session.process = mock_process

    await session.stop()

    mock_process.terminate.assert_called_once()
    mock_process.wait.assert_called_once()


@pytest.mark.asyncio
async def test_stop_when_no_process():
    """stop() does nothing if process is None."""
    player = MagicMock()
    session = IFSession(player, "/path/to/story.z5")
    session.process = None

    # Should not raise
    await session.stop()


@pytest.mark.asyncio
async def test_stop_when_already_terminated():
    """stop() handles already-terminated process gracefully."""
    player = MagicMock()
    session = IFSession(player, "/path/to/story.z5")

    # Mock process that's already done
    mock_process = AsyncMock()
    mock_process.returncode = 0
    session.process = mock_process

    await session.stop()

    # Should not call terminate on already-finished process
    mock_process.terminate.assert_not_called()


@pytest.mark.asyncio
async def test_read_response_detects_prompt():
    """_read_response() reads until '>' prompt appears."""
    player = MagicMock()
    session = IFSession(player, "/path/to/story.z5")

    # Mock process
    mock_process = AsyncMock()
    mock_process.stdout = AsyncMock()
    session.process = mock_process

    # Simulate multi-line output with prompt
    output_bytes = b"Line 1\nLine 2\nLine 3\n>"

    async def read_side_effect(n):
        nonlocal output_bytes
        if output_bytes:
            byte = output_bytes[:1]
            output_bytes = output_bytes[1:]
            return byte
        return b""

    mock_process.stdout.read = AsyncMock(side_effect=read_side_effect)

    result = await session._read_response()

    assert "Line 1" in result
    assert "Line 2" in result
    assert "Line 3" in result
    # Prompt should be stripped
    assert not result.strip().endswith(">")


@pytest.mark.asyncio
async def test_handle_input_strips_whitespace():
    """handle_input() strips input before sending to dfrotz."""
    player = MagicMock()
    session = IFSession(player, "/path/to/story.z5")

    # Mock process
    mock_process = MagicMock()
    mock_process.stdin = MagicMock()
    mock_process.stdin.write = MagicMock()
    mock_process.stdin.drain = AsyncMock()
    mock_process.stdout = AsyncMock()
    session.process = mock_process

    # Simulate response
    response_bytes = b"ok\n>"

    async def read_side_effect(n):
        nonlocal response_bytes
        if response_bytes:
            byte = response_bytes[:1]
            response_bytes = response_bytes[1:]
            return byte
        return b""

    mock_process.stdout.read = AsyncMock(side_effect=read_side_effect)

    await session.handle_input("  look  ")

    # Check that write was called with stripped input + newline
    calls = mock_process.stdin.write.call_args_list
    assert len(calls) == 1
    written = calls[0][0][0]
    assert written == b"look\n"


@pytest.mark.asyncio
async def test_handle_input_empty_string():
    """handle_input() with empty string sends newline to dfrotz."""
    player = MagicMock()
    session = IFSession(player, "/path/to/story.z5")

    # Mock process
    mock_process = MagicMock()
    mock_process.stdin = MagicMock()
    mock_process.stdin.write = MagicMock()
    mock_process.stdin.drain = AsyncMock()
    mock_process.stdout = AsyncMock()
    session.process = mock_process

    # Simulate response
    response_bytes = b"ok\n>"

    async def read_side_effect(n):
        nonlocal response_bytes
        if response_bytes:
            byte = response_bytes[:1]
            response_bytes = response_bytes[1:]
            return byte
        return b""

    mock_process.stdout.read = AsyncMock(side_effect=read_side_effect)

    await session.handle_input("")

    # Should still write a newline
    mock_process.stdin.write.assert_called()


def test_save_path_property(tmp_path):
    """save_path returns correct path for player/game combo."""
    player = MagicMock()
    player.name = "tester"
    session = IFSession(player, "/path/to/zork.z5", "zork")

    # Override data_dir for testing
    session._data_dir = tmp_path

    save_path = session.save_path
    assert save_path == tmp_path / "if_saves" / "tester" / "zork.qzl"


def test_ensure_save_dir_creates_directories(tmp_path):
    """_ensure_save_dir() creates parent directories."""
    player = MagicMock()
    player.name = "alice"
    session = IFSession(player, "/path/to/story.z5", "story")

    # Override data_dir for testing
    session._data_dir = tmp_path

    # Directory shouldn't exist yet
    expected_dir = tmp_path / "if_saves" / "alice"
    assert not expected_dir.exists()

    # Call _ensure_save_dir
    session._ensure_save_dir()

    # Now it should exist
    assert expected_dir.exists()
    assert expected_dir.is_dir()


@pytest.mark.asyncio
async def test_do_save_sends_save_command(tmp_path):
    """_do_save() sends save command and filepath to dfrotz."""
    player = MagicMock()
    player.name = "tester"
    session = IFSession(player, "/path/to/zork.z5", "zork")
    session._data_dir = tmp_path

    # Mock process
    mock_process = MagicMock()
    mock_process.stdin = MagicMock()
    mock_process.stdin.write = MagicMock()
    mock_process.stdin.drain = AsyncMock()
    mock_process.stdout = AsyncMock()
    session.process = mock_process

    # Simulate dfrotz responses: first the filename prompt, then confirmation
    responses = [
        b"Enter saved game to store: \n>",
        b"Ok.\n>",
    ]
    response_data = b"".join(responses)

    async def read_side_effect(n):
        nonlocal response_data
        if response_data:
            byte = response_data[:1]
            response_data = response_data[1:]
            return byte
        return b""

    mock_process.stdout.read = AsyncMock(side_effect=read_side_effect)

    result = await session._do_save()

    # Should have written "save\n" then the filepath
    calls = mock_process.stdin.write.call_args_list
    assert len(calls) == 2
    assert calls[0][0][0] == b"save\n"
    assert str(session.save_path) in calls[1][0][0].decode()
    assert b"\n" in calls[1][0][0]

    # Result should contain confirmation
    assert "Ok" in result or "ok" in result.lower()


@pytest.mark.asyncio
async def test_do_save_creates_save_directory(tmp_path):
    """_do_save() ensures save directory exists."""
    player = MagicMock()
    player.name = "alice"
    session = IFSession(player, "/path/to/story.z5", "story")
    session._data_dir = tmp_path

    # Mock process
    mock_process = MagicMock()
    mock_process.stdin = MagicMock()
    mock_process.stdin.write = MagicMock()
    mock_process.stdin.drain = AsyncMock()
    mock_process.stdout = AsyncMock()
    session.process = mock_process

    # Simulate dfrotz responses
    responses = [b"Enter saved game: \n>", b"Ok.\n>"]
    response_data = b"".join(responses)

    async def read_side_effect(n):
        nonlocal response_data
        if response_data:
            byte = response_data[:1]
            response_data = response_data[1:]
            return byte
        return b""

    mock_process.stdout.read = AsyncMock(side_effect=read_side_effect)

    # Directory shouldn't exist yet
    expected_dir = tmp_path / "if_saves" / "alice"
    assert not expected_dir.exists()

    await session._do_save()

    # Now it should exist
    assert expected_dir.exists()