"""Constants for the Xiaoxiang Smart BMS integration."""

DOMAIN = "xiaoxiang_bms"

CONF_ADDRESS = "address"
CONF_POLL_INTERVAL = "poll_interval"

DEFAULT_POLL_INTERVAL = 15  # seconds — each poll does a full BLE connect/disconnect
MIN_POLL_INTERVAL = 10      # below this the BMS has no breathing room between polls
MAX_POLL_INTERVAL = 300

# GATT UUIDs (Xiaoxiang BMS UART-over-GATT)
UART_SERVICE_UUID = "0000ff00-0000-1000-8000-00805f9b34fb"
RX_CHAR_UUID      = "0000ff01-0000-1000-8000-00805f9b34fb"  # BMS → HA (notify)
TX_CHAR_UUID      = "0000ff02-0000-1000-8000-00805f9b34fb"  # HA → BMS (write)

# Request frames: [0xDD, 0xA5, CMD, 0x00, CHK_HI, CHK_LO, 0x77]
CMD_GENERAL = bytes([0xDD, 0xA5, 0x03, 0x00, 0xFF, 0xFD, 0x77])  # pack info
CMD_CELL    = bytes([0xDD, 0xA5, 0x04, 0x00, 0xFF, 0xFC, 0x77])  # cell voltages
CMD_VERSION = bytes([0xDD, 0xA5, 0x05, 0x00, 0xFF, 0xFB, 0x77])  # hardware version string

# Frame markers
FRAME_START = 0xDD
FRAME_END   = 0x77

# MOS control values (XX byte in write command DD 5A E1 02 00 XX CHK_H CHK_L 77)
MOS_NORMAL        = 0x00  # release software lock — both gates open
MOS_CHARGE_OFF    = 0x01  # disable charge MOS, keep discharge MOS on
MOS_DISCHARGE_OFF = 0x02  # disable discharge MOS, keep charge MOS on
MOS_BOTH_OFF      = 0x03  # disable both charge and discharge MOS

# Response command IDs (byte 1 of frame)
CMD_ID_GENERAL = 0x03
CMD_ID_CELL    = 0x04
CMD_ID_VERSION = 0x05