from mqtt_home.topic_matcher import match_topic, extract_device_id, build_command_topic, extract_state_value


def test_match_topic_single_plus():
    assert match_topic("home/fire/state", "home/+/state") == {"1": "fire"}


def test_match_topic_no_match():
    assert match_topic("home/fire/state", "home/living/state") is None


def test_match_topic_hash():
    # # at end matches remaining segments
    result = match_topic("home/fire/brightness", "home/fire/#")
    assert result is not None
    assert "2" in result  # # is at index 2


def test_match_topic_multiple_plus():
    assert match_topic("home/fire/living/state", "home/+/+/state") == {"1": "fire", "2": "living"}


def test_match_topic_hash_matches_empty():
    assert match_topic("home/fire/", "home/fire/#") is not None


def test_extract_device_id_single_plus():
    assert extract_device_id("home/fire/state", "home/+/state") == "fire"


def test_extract_device_id_no_match():
    assert extract_device_id("home/fire/state", "home/living/state") is None


def test_extract_device_id_hash():
    assert extract_device_id("home/fire/brightness", "home/fire/#") == "brightness"


def test_extract_device_id_multiple_plus():
    # Returns last + match
    assert extract_device_id("home/fire/living/state", "home/+/+/state") == "living"


def test_build_command_topic_basic():
    assert build_command_topic("home/{device_id}/set", "fire") == "home/fire/set"


def test_build_command_topic_none():
    assert build_command_topic(None, "fire") is None
    assert build_command_topic("", "fire") is None


def test_extract_state_value_json_path():
    assert extract_state_value('{"state":"on"}', "state") == "on"


def test_extract_state_value_no_path():
    assert extract_state_value('{"state":"on"}', None) == '{"state":"on"}'


def test_extract_state_value_plain_text():
    assert extract_state_value("plain text", "state") == "plain text"


def test_extract_state_value_nested_path():
    assert extract_state_value('{"brightness":255}', "brightness") == "255"


def test_extract_state_value_missing_key():
    assert extract_state_value('{"temperature":22}', "humidity") == '{"temperature":22}'


def test_extract_state_value_numeric_value():
    assert extract_state_value('{"brightness":255}', "brightness") == "255"