"""NUT (UPS)-specific bot command handler."""

from __future__ import annotations

import logging
from collections.abc import Callable, Coroutine
from typing import Any

from ..database.models import CommandConfig, CommandTracker, ServiceProvider, TelegramBot
from ..services import make_nut_provider
from .base import CommandResponse, ProviderCommandHandler
from .handler import _render_cmd_template

_LOGGER = logging.getLogger(__name__)

_NUT_COMMANDS = {"status", "devices", "battery"}

# ---------------------------------------------------------------------------
# Command dispatch table
# ---------------------------------------------------------------------------

_TEXT_COMMANDS: dict[str, Callable[..., Coroutine[Any, Any, dict[str, Any]]]] = {}


def _text_cmd(fn: Callable[..., Coroutine[Any, Any, dict[str, Any]]]) -> Callable[..., Coroutine[Any, Any, dict[str, Any]]]:
    """Register a function in the text command dispatch table."""
    name = fn.__name__.removeprefix("_cmd_")
    _TEXT_COMMANDS[name] = fn
    return fn


class NutCommandHandler(ProviderCommandHandler):
    """Handles NUT-specific bot commands."""

    provider_type = "nut"

    def get_provider_commands(self) -> set[str]:
        return _NUT_COMMANDS

    def get_rate_categories(self) -> dict[str, str]:
        return {"devices": "api", "battery": "api", "status": "api"}

    async def handle(
        self,
        cmd: str,
        args: str,
        count: int,
        locale: str,
        response_mode: str,
        provider: ServiceProvider,
        cmd_templates: dict[str, dict[str, str]],
        bot: TelegramBot,
        tracker: CommandTracker,
        config: CommandConfig,
        *,
        listener: Any = None,
        page: int = 1,
    ) -> CommandResponse | None:
        fn = _TEXT_COMMANDS.get(cmd)
        if fn is None:
            return None
        ctx = await fn(provider, count)
        return CommandResponse(text=_render_cmd_template(cmd_templates, cmd, locale, ctx))


async def _query_ups(
    provider: ServiceProvider,
) -> list[dict[str, Any]]:
    """Connect to a NUT provider and query UPS data."""
    from notify_bridge_core.providers.nut.models import NutUpsData

    results: list[dict[str, Any]] = []
    nut = make_nut_provider(provider)
    try:
        client = nut._make_client()
        await client.connect()
        try:
            devices = await client.list_ups()
            for dev in devices:
                variables = await client.list_var(dev.name)
                data = NutUpsData.from_variables(dev.name, variables)
                results.append({
                    "name": data.name,
                    "description": data.description,
                    "model": data.model,
                    "manufacturer": data.manufacturer,
                    "status": data.status,
                    "battery_charge": int(data.battery_charge) if data.battery_charge is not None else None,
                    "battery_runtime": data.battery_runtime_formatted,
                    "ups_load": int(data.ups_load) if data.ups_load is not None else None,
                    "input_voltage": str(data.input_voltage) if data.input_voltage is not None else None,
                    "output_voltage": str(data.output_voltage) if data.output_voltage is not None else None,
                })
        finally:
            await client.disconnect()
    except Exception as exc:
        _LOGGER.warning("Failed to query NUT provider %s: %s", provider.name, exc)
    return results


@_text_cmd
async def _cmd_status(provider: ServiceProvider, count: int) -> dict[str, Any]:
    devices = await _query_ups(provider)
    return {"devices": devices}


@_text_cmd
async def _cmd_devices(provider: ServiceProvider, count: int) -> dict[str, Any]:
    devices: list[dict[str, Any]] = []
    nut = make_nut_provider(provider)
    try:
        device_list = await nut.list_collections()
        devices.extend(device_list)
    except Exception as exc:
        _LOGGER.warning("Failed to list devices from %s: %s", provider.name, exc)
    return {"devices": devices}


@_text_cmd
async def _cmd_battery(provider: ServiceProvider, count: int) -> dict[str, Any]:
    devices = await _query_ups(provider)
    return {"devices": devices}