"""Build control payloads without exposing packet layout to the GUI.

Framing and sequence numbers belong to Session. These helpers describe user
actions and return payloads only; they do not connect or send anything.
"""

from controller.protocol import EQ, LIGHTS

SOURCES = {"Bluetooth": 1, "USB 1": 2, "USB 2": 3, "AUX 1": 4, "AUX 2": 5}
KEYS = {"volume_up": 15, "volume_down": 16, "play_pause": 17, "mute": 20}


def set_eq(preset):
    if preset not in EQ.values():
        raise ValueError("Unknown EQ preset")
    return bytes((0x40, 3, 0, preset, 0))


def set_bass(enabled):
    # Samsung's bass flag is inverted: 0 means on, 1 means off.
    return bytes((0x40, 4, 0, 0 if enabled else 1, 0))


def set_lighting(mode):
    if mode not in LIGHTS.values():
        raise ValueError("Unknown lighting mode")
    return bytes((0x50, 3, mode))


def set_source(source):
    if source not in SOURCES.values():
        raise ValueError("Unknown source")
    return bytes((0x30, source))


def set_rgb(red, green, blue):
    if any(type(value) is not int or not 0 <= value <= 255 for value in (red, green, blue)):
        raise ValueError("RGB values must be integers between 0 and 255")
    return bytes((0x60, 2, red, green, blue))


def remote_key(action):
    try:
        return bytes((0x70, KEYS[action]))
    except KeyError as exc:
        raise ValueError("Unknown remote action") from exc


def lighting_status():
    return b"\x52\x03"


def status_queries():
    return b"\x42\x03", lighting_status()


def initial_queries():
    return b"\x32", b"\x42\x03"