"""Common code for Shelly library."""

from __future__ import annotations

import asyncio
import ipaddress
import logging
from dataclasses import dataclass
from socket import gethostbyname
from typing import TYPE_CHECKING, Any

from aiohttp import BasicAuth, ClientSession, ClientTimeout
from yarl import URL

if TYPE_CHECKING:
    from bleak import BLEDevice

from .const import (
    CONNECT_ERRORS,
    DEFAULT_HTTP_PORT,
    DEVICE_IO_TIMEOUT,
    DEVICES,
    FIRMWARE_PATTERN,
    MIN_FIRMWARE_DATES,
)
from .exceptions import (
    DeviceConnectionError,
    DeviceConnectionTimeoutError,
    InvalidHostError,
    MacAddressMismatchError,
    ShellyError,
)

_LOGGER = logging.getLogger(__name__)

DEVICE_IO_TIMEOUT_CLIENT_TIMEOUT = ClientTimeout(total=DEVICE_IO_TIMEOUT)


@dataclass
class ConnectionOptions:
    """Shelly options for connection."""

    ip_address: str | None = None
    username: str | None = None
    password: str | None = None
    temperature_unit: str = "C"
    auth: BasicAuth | None = None
    device_mac: str | None = None
    port: int = DEFAULT_HTTP_PORT
    ble_device: BLEDevice | None = None

    def __post_init__(self) -> None:
        """Call after initialization."""
        if self.ip_address is None and self.ble_device is None:
            raise ValueError("Must provide either ip_address or ble_device")

        if self.ip_address is not None and self.ble_device is not None:
            raise ValueError("Cannot provide both ip_address and ble_device")

        if self.username is not None:
            if self.password is None:
                raise ValueError("Supply both username and password")

            object.__setattr__(self, "auth", BasicAuth(self.username, self.password))


IpOrOptionsType = str | ConnectionOptions


async def process_ip_or_options(ip_or_options: IpOrOptionsType) -> ConnectionOptions:
    """Return ConnectionOptions class from ip str or ConnectionOptions."""
    if isinstance(ip_or_options, str):
        options = ConnectionOptions(ip_address=ip_or_options)
    else:
        options = ip_or_options

    # Only process IP address if provided (not for BLE connections)
    if options.ip_address is not None:
        try:
            ipaddress.ip_address(options.ip_address)
        except ValueError:
            loop = asyncio.get_running_loop()
            options.ip_address = await loop.run_in_executor(
                None, gethostbyname, options.ip_address
            )

    return options


async def get_info(
    aiohttp_session: ClientSession,
    ip_address: str,
    device_mac: str | None = None,
    port: int = DEFAULT_HTTP_PORT,
) -> dict[str, Any]:
    """Get info from device through REST call."""
    error: ShellyError
    try:
        async with aiohttp_session.get(
            URL.build(scheme="http", host=ip_address, port=port, path="/shelly"),
            raise_for_status=True,
            timeout=DEVICE_IO_TIMEOUT_CLIENT_TIMEOUT,
        ) as resp:
            result: dict[str, Any] = await resp.json()
    except TimeoutError as err:
        error = DeviceConnectionTimeoutError(err)
        _LOGGER.debug("host %s:%s: timeout error: %r", ip_address, port, error)
        raise error from err
    except ValueError as err:
        error = InvalidHostError(err)
        _LOGGER.debug("host %s is invalid: %r", ip_address, error)
        raise error from err
    except CONNECT_ERRORS as err:
        error = DeviceConnectionError(err)
        _LOGGER.debug("host %s:%s: error: %r", ip_address, port, error)
        raise error from err

    mac = result["mac"]
    if device_mac and device_mac.lower() != mac.lower():
        error = MacAddressMismatchError(f"Input MAC: {device_mac}, Shelly MAC: {mac}")
        _LOGGER.debug("host %s:%s: error: %r", ip_address, port, error)
        raise error

    return result


def is_firmware_supported(gen: int, model: str, firmware_version: str) -> bool:
    """Return True if firmware is supported."""
    fw_ver: int | None
    if device := DEVICES.get(model):
        # Specific model is known
        if not device.supported:
            return False
        fw_ver = device.min_fw_date
    elif not (fw_ver := MIN_FIRMWARE_DATES.get(gen)):
        # Protection against future generations of devices.
        return False

    match = FIRMWARE_PATTERN.search(firmware_version)
    if match is None:
        return False
    # We compare firmware release dates because Shelly version numbering is
    # inconsistent, sometimes the word is used as the version number.
    return int(match[0]) >= fw_ver