"""
Home Assistant tools — read device states and call services.

Credentials are read automatically from the current user's channels.json:
  "homeassistant": {"url": "https://ha.example.com", "token": "<long-lived-token>"}

Configure in Settings → Notifications → Home Assistant.
"""

import json
import logging

import httpx
from google.genai import types

from auth_utils import get_user_channels
from persona import get_user

logger = logging.getLogger(__name__)

_TIMEOUT = 10

# Attributes that are internal/noisy and not useful to show
_SKIP_ATTRS = {
    "friendly_name", "icon", "entity_picture", "supported_features",
    "supported_color_modes", "color_mode", "min_color_temp_kelvin",
    "max_color_temp_kelvin", "min_mireds", "max_mireds",
    "assumed_state", "attribution",
}


def _get_ha_cfg() -> tuple[str, str]:
    """Return (base_url, token) from the current user's channels.json."""
    channels = get_user_channels(get_user())
    ha    = channels.get("homeassistant") or {}
    url   = (ha.get("url") or "").rstrip("/")
    token = ha.get("token") or ""
    if not url or not token:
        raise ValueError(
            "Home Assistant not configured — add URL and token in Settings → Notifications."
        )
    return url, token


def _auth(token: str) -> dict:
    return {"Authorization": f"Bearer {token}", "Content-Type": "application/json"}


def _fmt_state(s: dict) -> str:
    """Format a single HA state dict as a compact readable line."""
    entity_id = s.get("entity_id", "")
    state     = s.get("state", "unknown")
    attrs     = s.get("attributes", {})
    name      = attrs.get("friendly_name", entity_id)

    label = f"{name} ({entity_id})" if name != entity_id else entity_id
    useful = {k: v for k, v in attrs.items() if k not in _SKIP_ATTRS}

    extra = ""
    if useful:
        parts = []
        for k, v in list(useful.items())[:6]:   # cap at 6 attrs per entity
            parts.append(f"{k}: {v}")
        extra = "  [" + ", ".join(parts) + "]"

    return f"{label}: {state}{extra}"


async def ha_get_state(entity_id: str) -> str:
    """Return the current state and attributes of a single Home Assistant entity."""
    try:
        url, token = _get_ha_cfg()
    except ValueError as e:
        return str(e)

    try:
        async with httpx.AsyncClient(timeout=_TIMEOUT) as client:
            resp = await client.get(f"{url}/api/states/{entity_id}", headers=_auth(token))

        if resp.status_code == 404:
            return f"Entity not found: {entity_id}"
        if resp.status_code != 200:
            return f"HA API error {resp.status_code}: {resp.text[:400]}"

        s     = resp.json()
        attrs = s.get("attributes", {})
        lines = [
            f"**{attrs.get('friendly_name', entity_id)}** (`{entity_id}`)",
            f"State: **{s.get('state', 'unknown')}**",
        ]
        changed = (s.get("last_changed") or "")[:19].replace("T", " ")
        if changed:
            lines.append(f"Last changed: {changed} UTC")

        useful = {k: v for k, v in attrs.items() if k not in _SKIP_ATTRS}
        if useful:
            lines.append("Attributes:")
            for k, v in useful.items():
                lines.append(f"  {k}: {v}")

        return "\n".join(lines)

    except httpx.HTTPError as e:
        return f"Connection error: {e}"
    except Exception as e:
        logger.warning("ha_get_state error: %s", e)
        return f"Error: {e}"


async def ha_get_states(domain: str = "", area: str = "") -> str:
    """List HA entity states, optionally filtered by domain (e.g. 'light') or area name."""
    try:
        url, token = _get_ha_cfg()
    except ValueError as e:
        return str(e)

    try:
        async with httpx.AsyncClient(timeout=_TIMEOUT) as client:
            resp = await client.get(f"{url}/api/states", headers=_auth(token))

        if resp.status_code != 200:
            return f"HA API error {resp.status_code}: {resp.text[:400]}"

        states = resp.json()

        if domain:
            states = [s for s in states if s.get("entity_id", "").startswith(f"{domain}.")]
        if area:
            al = area.lower()
            states = [s for s in states
                      if al in (s.get("attributes", {}).get("friendly_name") or "").lower()]

        if not states:
            filters = [f"domain={domain}"] * bool(domain) + [f"area={area}"] * bool(area)
            return "No entities found" + (f" ({', '.join(filters)})" if filters else "")

        lines = [f"{len(states)} entit{'y' if len(states) == 1 else 'ies'}:"]
        for s in sorted(states, key=lambda x: x.get("entity_id", "")):
            lines.append(_fmt_state(s))
        return "\n".join(lines)

    except httpx.HTTPError as e:
        return f"Connection error: {e}"
    except Exception as e:
        logger.warning("ha_get_states error: %s", e)
        return f"Error: {e}"


async def ha_call_service(
    domain:    str,
    service:   str,
    entity_id: str = "",
    data:      str = "",
) -> str:
    """Call a Home Assistant service (turn on/off lights, set thermostat, lock doors, etc.)."""
    try:
        url, token = _get_ha_cfg()
    except ValueError as e:
        return str(e)

    payload: dict = {}
    if entity_id:
        payload["entity_id"] = entity_id
    if data:
        try:
            extra = json.loads(data)
            if isinstance(extra, dict):
                payload.update(extra)
        except json.JSONDecodeError:
            return f"Invalid JSON in data: {data}"

    try:
        async with httpx.AsyncClient(timeout=_TIMEOUT) as client:
            resp = await client.post(
                f"{url}/api/services/{domain}/{service}",
                headers=_auth(token),
                json=payload,
            )

        if resp.status_code not in (200, 201):
            return f"HA API error {resp.status_code}: {resp.text[:400]}"

        changed = resp.json()
        if not changed:
            return f"✓ {domain}.{service} called (no state changes reported)."

        lines = [f"✓ {domain}.{service} — {len(changed)} entity state(s) updated:"]
        for s in changed:
            lines.append(f"  {s.get('entity_id', '')}: {s.get('state', '')}")
        return "\n".join(lines)

    except httpx.HTTPError as e:
        return f"Connection error: {e}"
    except Exception as e:
        logger.warning("ha_call_service error: %s", e)
        return f"Error: {e}"


DECLARATIONS = [
    types.FunctionDeclaration(
        name="ha_get_state",
        description=(
            "Get the current state and attributes of a single Home Assistant entity. "
            "Use to check if a light is on, read a thermostat temperature, check a "
            "door/window sensor, battery level, HVAC mode, etc. "
            "entity_id format: domain.name — e.g. light.living_room, switch.garage, "
            "climate.ecobee, binary_sensor.front_door, sensor.outdoor_temp."
        ),
        parameters=types.Schema(
            type=types.Type.OBJECT,
            properties={
                "entity_id": types.Schema(
                    type=types.Type.STRING,
                    description="Full entity ID, e.g. light.living_room or climate.ecobee_main",
                ),
            },
            required=["entity_id"],
        ),
    ),
    types.FunctionDeclaration(
        name="ha_get_states",
        description=(
            "List Home Assistant entity states, optionally filtered by domain or area. "
            "Use to survey what devices exist or check multiple entities at once. "
            "Domain examples: light, switch, sensor, climate, binary_sensor, lock, cover, "
            "media_player, input_boolean. Leave both blank to list everything (can be large)."
        ),
        parameters=types.Schema(
            type=types.Type.OBJECT,
            properties={
                "domain": types.Schema(
                    type=types.Type.STRING,
                    description="Filter to this domain, e.g. 'light' or 'switch' (optional)",
                ),
                "area": types.Schema(
                    type=types.Type.STRING,
                    description="Filter by area name substring match on friendly name (optional)",
                ),
            },
        ),
    ),
    types.FunctionDeclaration(
        name="ha_call_service",
        description=(
            "Call a Home Assistant service to control a device or trigger an automation. "
            "Requires user confirmation before executing. Common examples: "
            "domain=light service=turn_on entity_id=light.living_room; "
            "domain=light service=turn_off entity_id=light.all; "
            "domain=switch service=toggle entity_id=switch.garage; "
            "domain=climate service=set_temperature data={\"temperature\":72}; "
            "domain=lock service=lock entity_id=lock.front_door; "
            "domain=script service=turn_on entity_id=script.goodnight."
        ),
        parameters=types.Schema(
            type=types.Type.OBJECT,
            properties={
                "domain": types.Schema(
                    type=types.Type.STRING,
                    description="Service domain: light, switch, climate, lock, cover, script, automation, etc.",
                ),
                "service": types.Schema(
                    type=types.Type.STRING,
                    description="Service name: turn_on, turn_off, toggle, set_temperature, lock, unlock, open, close, etc.",
                ),
                "entity_id": types.Schema(
                    type=types.Type.STRING,
                    description="Target entity ID — omit for services that don't target a specific entity",
                ),
                "data": types.Schema(
                    type=types.Type.STRING,
                    description='Extra service data as JSON string, e.g. {"temperature": 72, "hvac_mode": "heat"}',
                ),
            },
            required=["domain", "service"],
        ),
    ),
]