# -*- coding: utf-8 -*-
import struct
from enum import Enum, unique
from typing import Callable, Optional


@unique
class DataName(str, Enum):
    BATTERY_CHARGE = "battery_charge"
    BATTERY_VOLTAGE = "battery_voltage"
    BATTERY_CURRENT = "battery_current"
    INTERNAL_TEMPERATURE = "internal_temperature"
    BATTERY_TEMPERATURE = "battery_temperature"
    LOAD_VOLTAGE = "load_voltage"
    LOAD_CURRENT = "load_current"
    LOAD_POWER = "load_power"
    PANEL_VOLTAGE = "panel_voltage"
    PANEL_CURRENT = "panel_current"
    PANEL_POWER = "panel_power"
    LOAD_ENABLED = "load_enabled"
    BATTERY_VOLTAGE_MIN = "battery_voltage_min"
    BATTERY_VOLTAGE_MAX = "battery_voltage_max"
    CHARGE_MAX_CURRENT = "charge_max_current"
    _DISCHARGE_MAX_CURRENT = "_discharge_max_current?"
    CHARGE_MAX_POWER = "charge_max_power"
    DISCHARGE_MAX_POWER = "discharge_max_power"
    CHARGE_AMP_HOUR = "charge_amp_hour"
    DISCHARGE_AMP_HOUR = "discharge_amp_hour"
    PRODUCTION_ENERGY = "production_energy"
    CONSUMPTION_ENERGY = "consumption_energy"
    RUN_DAYS = "run_days"
    DISCHARGE_COUNT = "discharge_count"
    FULL_CHARGE_COUNT = "full_charge_count"
    TOTAL_CHARGE_AMP_HOURS = "total_charge_amp_hours"
    TOTAL_DISCHARGE_AMP_HOURS = "total_discharge_amp_hours"
    TOTAL_PRODUCTION_ENERGY = "total_production_energy"
    TOTAL_CONSUMPTION_ENERGY = "total_consumption_energy"

    CALCULATED_BATTERY_POWER = "calculated_battery_power"
    CALCULATED_PANEL_POWER = "calculated_panel_power"
    CALCULATED_LOAD_POWER = "calculated_load_power"

    def __repr__(self):
        return repr(self.value)


class DataItem:
    name: DataName
    st_format: str
    unit: Optional[str]
    transformation: Optional[Callable]

    def __init__(
        self,
        name: DataName,
        st_format: str,
        unit: Optional[str] = None,
        transform: Optional[Callable] = None,
    ):
        self.name = name
        self.st_format = st_format
        self.unit = unit
        self.transformation = transform

        if self.st_format[0] not in "@=<>!":
            self.st_format = "!" + self.st_format

    @property
    def st_size(self) -> int:
        return struct.calcsize(self.st_format)

    def transform(self, data):
        if self.transformation is None:
            return data
        return self.transformation(data)


def parse_temperature(bin):
    if bin & 0x80:
        return (bin & 0x7F) * -1
    return bin & 0x7F


DATA_BATTERY_STATE = [
    DataItem(DataName.BATTERY_CHARGE, "H", "%"),
    DataItem(DataName.BATTERY_VOLTAGE, "H", "V", lambda n: n / 10),
    DataItem(DataName.BATTERY_CURRENT, "H", "A", lambda n: n / 100),
    DataItem(DataName.INTERNAL_TEMPERATURE, "B", "°C", parse_temperature),
    DataItem(DataName.BATTERY_TEMPERATURE, "B", "°C", parse_temperature),
    DataItem(DataName.LOAD_VOLTAGE, "H", "V", lambda n: n / 10),
    DataItem(DataName.LOAD_CURRENT, "H", "A", lambda n: n / 100),
    DataItem(DataName.LOAD_POWER, "H", "W"),
    DataItem(DataName.PANEL_VOLTAGE, "H", "V", lambda n: n / 10),
    DataItem(DataName.PANEL_CURRENT, "H", "A", lambda n: n / 100),
    DataItem(DataName.PANEL_POWER, "H", "W"),
    DataItem(DataName.LOAD_ENABLED, "x?", transform=bool),
]


HISTORICAL_DATA = [
    DataItem(DataName.BATTERY_VOLTAGE_MIN, "H", "V", lambda n: n / 10),
    DataItem(DataName.BATTERY_VOLTAGE_MAX, "H", "V", lambda n: n / 10),
    DataItem(DataName.CHARGE_MAX_CURRENT, "H", "A", lambda n: n / 100),
    DataItem(DataName._DISCHARGE_MAX_CURRENT, "H", "A", lambda n: n / 100),
    DataItem(DataName.CHARGE_MAX_POWER, "H", "W"),
    DataItem(DataName.DISCHARGE_MAX_POWER, "H", "W"),
    DataItem(DataName.CHARGE_AMP_HOUR, "H", "Ah"),
    DataItem(DataName.DISCHARGE_AMP_HOUR, "H", "Ah"),
    DataItem(DataName.PRODUCTION_ENERGY, "H", "Wh"),
    DataItem(DataName.CONSUMPTION_ENERGY, "H", "Wh"),
    DataItem(DataName.RUN_DAYS, "H"),
    DataItem(DataName.DISCHARGE_COUNT, "H"),
    DataItem(DataName.FULL_CHARGE_COUNT, "H"),
    DataItem(DataName.TOTAL_CHARGE_AMP_HOURS, "L", "Ah"),
    DataItem(DataName.TOTAL_DISCHARGE_AMP_HOURS, "L", "Ah"),
    DataItem(DataName.TOTAL_PRODUCTION_ENERGY, "L", "Wh"),
    DataItem(DataName.TOTAL_CONSUMPTION_ENERGY, "L", "Wh"),
]