"""Tests for audio state persistence."""

import json
from pathlib import Path


from stt_daemon.state import AudioState, Loopback, StateStore


def test_state_store_save_and_load(tmp_path):
    """Test round-trip save and load of state."""
    state_file = tmp_path / "audio.json"
    store = StateStore(state_file)

    original_state = AudioState(
        sink_name="VirtualMicSink",
        remap_name="VirtualMic",
        null_sink_module=10,
        remap_module=11,
        loopbacks=[
            Loopback(module_id=12, source="alsa_input.usb-Foo"),
            Loopback(module_id=13, source="alsa_output.pci-0000.monitor"),
        ],
        selected_sources=["alsa_input.usb-Foo", "alsa_output.pci-0000.monitor"],
    )

    store.save(original_state)
    loaded_state = store.load()

    assert loaded_state is not None
    assert loaded_state.sink_name == original_state.sink_name
    assert loaded_state.remap_name == original_state.remap_name
    assert loaded_state.null_sink_module == original_state.null_sink_module
    assert loaded_state.remap_module == original_state.remap_module
    assert len(loaded_state.loopbacks) == 2
    assert loaded_state.loopbacks[0].module_id == 12
    assert loaded_state.loopbacks[0].source == "alsa_input.usb-Foo"
    assert loaded_state.selected_sources == original_state.selected_sources


def test_state_store_load_missing():
    """Test that load returns None for missing file."""
    store = StateStore(Path("/nonexistent/path/audio.json"))
    loaded_state = store.load()

    assert loaded_state is None


def test_state_store_load_corrupt_json(tmp_path):
    """Test that load returns None for corrupt JSON."""
    state_file = tmp_path / "audio.json"
    state_file.write_text("{ invalid json }")

    store = StateStore(state_file)
    loaded_state = store.load()

    assert loaded_state is None


def test_state_store_clear(tmp_path):
    """Test that clear removes the state file."""
    state_file = tmp_path / "audio.json"
    store = StateStore(state_file)

    state = AudioState(
        sink_name="VirtualMicSink",
        remap_name="VirtualMic",
        null_sink_module=10,
        remap_module=11,
    )
    store.save(state)

    assert state_file.exists()

    store.clear()

    assert not state_file.exists()


def test_state_store_default_path_env_var(tmp_path, monkeypatch):
    """Test that StateStore uses STT_DAEMON_STATE env var."""
    state_file = tmp_path / "custom_audio.json"
    monkeypatch.setenv("STT_DAEMON_STATE", str(state_file))

    store = StateStore()

    assert store.path == state_file


def test_state_store_default_path_xdg(tmp_path, monkeypatch):
    """Test that StateStore uses XDG_STATE_HOME for default path."""
    monkeypatch.delenv("STT_DAEMON_STATE", raising=False)
    monkeypatch.setenv("XDG_STATE_HOME", str(tmp_path))

    store = StateStore()

    expected_path = tmp_path / "stt-daemon" / "audio.json"
    assert store.path == expected_path


def test_state_store_creates_parent_dirs(tmp_path):
    """Test that save creates parent directories."""
    state_file = tmp_path / "deep" / "nested" / "dirs" / "audio.json"
    store = StateStore(state_file)

    state = AudioState(
        sink_name="VirtualMicSink",
        remap_name="VirtualMic",
        null_sink_module=10,
        remap_module=11,
    )

    store.save(state)

    assert state_file.parent.exists()
    assert state_file.exists()


def test_state_store_load_respects_json_format(tmp_path):
    """Test that load respects the JSON format with loopbacks."""
    state_file = tmp_path / "audio.json"

    data = {
        "sink_name": "VirtualMicSink",
        "remap_name": "VirtualMic",
        "null_sink_module": 10,
        "remap_module": 11,
        "loopbacks": [
            {"module_id": 12, "source": "alsa_input.usb-Foo"},
        ],
        "selected_sources": ["alsa_input.usb-Foo"],
    }

    state_file.write_text(json.dumps(data))

    store = StateStore(state_file)
    loaded_state = store.load()

    assert loaded_state is not None
    assert loaded_state.selected_sources == ["alsa_input.usb-Foo"]