"""Home Assistant integration – fetch entity states & call services."""

from __future__ import annotations

import logging
from typing import Any, Dict, List, Optional

import httpx

logger = logging.getLogger(__name__)


# ---------------------------------------------------------------------------
# Helpers
# ---------------------------------------------------------------------------

def _friendly_name(entity: Dict[str, Any]) -> str:
    """Extract the friendly name from an entity's attributes, falling back to entity_id."""
    attrs = entity.get("attributes", {})
    return attrs.get("friendly_name", entity.get("entity_id", "unknown"))


def _parse_light(entity: Dict[str, Any]) -> Dict[str, Any]:
    attrs = entity.get("attributes", {})
    brightness_raw = attrs.get("brightness")
    brightness_pct: Optional[int] = None
    if brightness_raw is not None:
        try:
            brightness_pct = round(int(brightness_raw) / 255 * 100)
        except (ValueError, TypeError):
            brightness_pct = None
    return {
        "entity_id": entity.get("entity_id", ""),
        "name": _friendly_name(entity),
        "state": entity.get("state", "unknown"),
        "brightness": brightness_pct,
        "color_mode": attrs.get("color_mode"),
    }


def _parse_switch(entity: Dict[str, Any]) -> Dict[str, Any]:
    return {
        "entity_id": entity.get("entity_id", ""),
        "name": _friendly_name(entity),
        "state": entity.get("state", "unknown"),
    }


def _parse_cover(entity: Dict[str, Any]) -> Dict[str, Any]:
    attrs = entity.get("attributes", {})
    return {
        "entity_id": entity.get("entity_id", ""),
        "name": _friendly_name(entity),
        "state": entity.get("state", "unknown"),
        "current_position": attrs.get("current_position"),
        "device_class": attrs.get("device_class", ""),
    }


def _parse_sensor(entity: Dict[str, Any]) -> Dict[str, Any]:
    attrs = entity.get("attributes", {})
    state_value = entity.get("state", "unknown")
    try:
        state_value = round(float(state_value), 1)
    except (ValueError, TypeError):
        pass
    return {
        "entity_id": entity.get("entity_id", ""),
        "name": _friendly_name(entity),
        "state": state_value,
        "unit": attrs.get("unit_of_measurement", ""),
        "device_class": attrs.get("device_class", ""),
    }


def _parse_binary_sensor(entity: Dict[str, Any]) -> Dict[str, Any]:
    attrs = entity.get("attributes", {})
    return {
        "entity_id": entity.get("entity_id", ""),
        "name": _friendly_name(entity),
        "state": entity.get("state", "unknown"),
        "device_class": attrs.get("device_class", ""),
    }


def _parse_climate(entity: Dict[str, Any]) -> Dict[str, Any]:
    attrs = entity.get("attributes", {})
    current_temp = attrs.get("current_temperature")
    target_temp = attrs.get("temperature")
    try:
        current_temp = round(float(current_temp), 1) if current_temp is not None else None
    except (ValueError, TypeError):
        current_temp = None
    try:
        target_temp = round(float(target_temp), 1) if target_temp is not None else None
    except (ValueError, TypeError):
        target_temp = None
    return {
        "entity_id": entity.get("entity_id", ""),
        "name": _friendly_name(entity),
        "state": entity.get("state", "unknown"),
        "current_temperature": current_temp,
        "target_temperature": target_temp,
        "hvac_modes": attrs.get("hvac_modes", []),
        "humidity": attrs.get("current_humidity"),
    }


# Sensor device_classes we care about
_SENSOR_CLASSES = {"temperature", "humidity"}

# Binary sensor device_classes we display
_BINARY_SENSOR_CLASSES = {"door", "window", "motion", "occupancy"}

# ---------------------------------------------------------------------------
# Filters — exclude Unraid infrastructure entities from the smart-home view.
# Unraid integration exposes Docker containers, system services, VMs,
# disk temps, CPU/GPU temps etc. as HA entities. They clutter the dashboard.
# ---------------------------------------------------------------------------

# Switches whose friendly_name starts with these are hidden
_SWITCH_EXCLUDE_PREFIXES = (
    "Daddelolymp Docker:",
    "Daddelolymp Service:",
    "Daddelolymp VM:",
    "Daddelolymp Array:",
    "Moneyboy Docker:",
    "Moneyboy Service:",
    "Moneyboy VM:",
    "Moneyboy Array:",
)

# Also exclude exact switch names that are server-level, not smart-home
_SWITCH_EXCLUDE_EXACT = {
    "Daddelolymp",
    "Moneyboy",
}

# Switches whose friendly_name contains these substrings are technical settings
_SWITCH_EXCLUDE_SUBSTRINGS = (
    "Child lock",
    "Led indication",
    "Indicator",
    "Permit join",
)

# Sensor friendly_names containing these substrings are hardware, not room sensors
_SENSOR_EXCLUDE_SUBSTRINGS = (
    "System: CPU",
    "System: Motherboard",
    "Disk:",
    "GPU:",
)


# ---------------------------------------------------------------------------
# Fetch all entity states
# ---------------------------------------------------------------------------

async def fetch_ha_data(url: str, token: str) -> Dict[str, Any]:
    """Fetch and categorise entity states from a Home Assistant instance."""

    result: Dict[str, Any] = {
        "online": False,
        "lights": [],
        "switches": [],
        "covers": [],
        "sensors": [],
        "binary_sensors": [],
        "climate": [],
        "lights_on": 0,
        "lights_total": 0,
        "switches_on": 0,
        "switches_total": 0,
        "error": None,
    }

    if not url or not token:
        result["error"] = "Missing Home Assistant URL or token"
        return result

    base_url = url.rstrip("/")
    headers = {
        "Authorization": f"Bearer {token}",
        "Content-Type": "application/json",
    }

    try:
        async with httpx.AsyncClient(timeout=15, verify=False) as client:
            resp = await client.get(f"{base_url}/api/states", headers=headers)
            resp.raise_for_status()
            entities: List[Dict[str, Any]] = resp.json()
    except httpx.HTTPStatusError as exc:
        result["error"] = f"HTTP {exc.response.status_code}"
        return result
    except httpx.RequestError as exc:
        result["error"] = f"Connection failed: {exc}"
        return result
    except Exception as exc:
        result["error"] = str(exc)
        return result

    result["online"] = True

    lights: List[Dict[str, Any]] = []
    switches: List[Dict[str, Any]] = []
    covers: List[Dict[str, Any]] = []
    sensors: List[Dict[str, Any]] = []
    binary_sensors: List[Dict[str, Any]] = []
    climate_list: List[Dict[str, Any]] = []

    for entity in entities:
        entity_id: str = entity.get("entity_id", "")
        domain = entity_id.split(".")[0] if "." in entity_id else ""
        attrs = entity.get("attributes", {})
        state = entity.get("state", "")

        if state in ("unavailable", "unknown"):
            continue

        friendly = _friendly_name(entity)

        if domain == "light":
            lights.append(_parse_light(entity))

        elif domain == "switch":
            # Skip Unraid infrastructure switches + technical settings
            if friendly in _SWITCH_EXCLUDE_EXACT:
                continue
            if any(friendly.startswith(p) for p in _SWITCH_EXCLUDE_PREFIXES):
                continue
            if any(sub in friendly for sub in _SWITCH_EXCLUDE_SUBSTRINGS):
                continue
            switches.append(_parse_switch(entity))

        elif domain == "cover":
            covers.append(_parse_cover(entity))

        elif domain == "sensor":
            device_class = attrs.get("device_class", "")
            if device_class in _SENSOR_CLASSES:
                # Skip hardware monitoring sensors (disk/CPU/GPU temps)
                if any(sub in friendly for sub in _SENSOR_EXCLUDE_SUBSTRINGS):
                    continue
                sensors.append(_parse_sensor(entity))

        elif domain == "binary_sensor":
            device_class = attrs.get("device_class", "")
            if device_class in _BINARY_SENSOR_CLASSES:
                binary_sensors.append(_parse_binary_sensor(entity))

        elif domain == "climate":
            climate_list.append(_parse_climate(entity))

    result["lights"] = lights
    result["switches"] = switches
    result["covers"] = covers
    result["sensors"] = sensors
    result["binary_sensors"] = binary_sensors
    result["climate"] = climate_list
    result["lights_on"] = sum(1 for l in lights if l["state"] == "on")
    result["lights_total"] = len(lights)
    result["switches_on"] = sum(1 for s in switches if s["state"] == "on")
    result["switches_total"] = len(switches)

    logger.info(
        "[HA] Fetched %d lights (%d on), %d switches (%d on), %d covers, "
        "%d sensors, %d binary, %d climate",
        len(lights), result["lights_on"],
        len(switches), result["switches_on"],
        len(covers), len(sensors), len(binary_sensors), len(climate_list),
    )

    return result


# ---------------------------------------------------------------------------
# Call HA service (control entities)
# ---------------------------------------------------------------------------

# Map of (domain, action) → HA service name
_ACTION_MAP: Dict[tuple, str] = {
    ("light", "toggle"): "toggle",
    ("light", "turn_on"): "turn_on",
    ("light", "turn_off"): "turn_off",
    ("switch", "toggle"): "toggle",
    ("switch", "turn_on"): "turn_on",
    ("switch", "turn_off"): "turn_off",
    ("cover", "open"): "open_cover",
    ("cover", "close"): "close_cover",
    ("cover", "stop"): "stop_cover",
    ("climate", "turn_on"): "turn_on",
    ("climate", "turn_off"): "turn_off",
}


async def call_ha_service(
    url: str,
    token: str,
    entity_id: str,
    action: str,
    service_data: Optional[Dict[str, Any]] = None,
) -> Dict[str, Any]:
    """Call a Home Assistant service to control an entity.

    Args:
        url: Base URL of the HA instance.
        token: Long-lived access token.
        entity_id: e.g. ``light.wohnzimmer_deckenlampe``
        action: e.g. ``toggle``, ``turn_on``, ``turn_off``, ``open``, ``close``, ``stop``
        service_data: Optional extra data (e.g. brightness).

    Returns:
        ``{"ok": True}`` on success, ``{"ok": False, "error": "..."}`` on failure.
    """

    if "." not in entity_id:
        return {"ok": False, "error": f"Invalid entity_id: {entity_id}"}

    domain = entity_id.split(".")[0]
    service = _ACTION_MAP.get((domain, action))
    if service is None:
        return {"ok": False, "error": f"Unknown action '{action}' for domain '{domain}'"}

    base_url = url.rstrip("/")
    headers = {
        "Authorization": f"Bearer {token}",
        "Content-Type": "application/json",
    }

    payload: Dict[str, Any] = {"entity_id": entity_id}
    if service_data:
        payload.update(service_data)

    try:
        async with httpx.AsyncClient(timeout=10, verify=False) as client:
            resp = await client.post(
                f"{base_url}/api/services/{domain}/{service}",
                headers=headers,
                json=payload,
            )
            resp.raise_for_status()
    except httpx.HTTPStatusError as exc:
        logger.error("[HA] Service call failed: HTTP %s for %s/%s %s",
                     exc.response.status_code, domain, service, entity_id)
        return {"ok": False, "error": f"HTTP {exc.response.status_code}"}
    except Exception as exc:
        logger.error("[HA] Service call error: %s for %s/%s %s",
                     exc, domain, service, entity_id)
        return {"ok": False, "error": str(exc)}

    logger.info("[HA] %s/%s → %s ✓", domain, service, entity_id)
    return {"ok": True}