import logging
import async_timeout
import aiohttp
from datetime import timedelta

from homeassistant.components.sensor import SensorEntity
from homeassistant.helpers.entity import DeviceInfo
from homeassistant.helpers.update_coordinator import DataUpdateCoordinator, UpdateFailed
from .const import DOMAIN

_LOGGER = logging.getLogger(__name__)

SCAN_INTERVAL = timedelta(seconds=15)

async def async_setup_entry(hass, entry, async_add_entities):
    """Add sensors for WhatsApp accounts, live status, and a global broadcast sensor."""
    
    # Coordinator für den echten Live-Status vom Add-on einrichten
    async def _async_update_data():
        url = "http://866fd2eb-whatsapp-bridge:3000/api/status"
        async with aiohttp.ClientSession() as session:
            try:
                async with async_timeout.timeout(5):
                    async with session.get(url) as response:
                        if response.status != 200:
                            raise UpdateFailed(f"API meldet Fehler {response.status}")
                        return await response.json()
            except Exception as err:
                raise UpdateFailed(f"Add-on nicht erreichbar: {err}")

    coordinator = DataUpdateCoordinator(
        hass,
        _LOGGER,
        name="whatsapp_bridge_status",
        update_method=_async_update_data,
        update_interval=SCAN_INTERVAL,
    )

    try:
        await coordinator.async_config_entry_first_refresh()
    except UpdateFailed:
        _LOGGER.warning("Erster Status-Abruf fehlgeschlagen. Add-on läuft eventuell noch an.")

    # Jeder Account bekommt immer seine eigene Entität
    entities = [WhatsAppAccountEntity(entry)]
    
    # Globale Entitäten (Status & Broadcast) NUR EINMALIG für die gesamte Integration anlegen
    if not hass.data[DOMAIN].get("global_entities_registered"):
        entities.append(WhatsAppStatusSensor(coordinator))
        entities.append(WhatsAppBroadcastEntity())
        hass.data[DOMAIN]["global_entities_registered"] = True
        
    async_add_entities(entities, True)


class WhatsAppAccountEntity(SensorEntity):
    """Individual Account (e.g., Rene, Work)."""
    def __init__(self, entry):
        self._entry = entry
        self._attr_name = f"WhatsApp {entry.title}"
        self._attr_unique_id = f"{entry.entry_id}_status"
        self._attr_icon = "mdi:whatsapp"
        self._attr_extra_state_attributes = {
            "phone_number": entry.data.get("phone_number"),
            "is_broadcast": False
        }

    @property
    def state(self):
        return "Ready"

    @property
    def device_info(self) -> DeviceInfo:
        """Ordnet diesen Sensor seinem spezifischen Personen-Gerät zu."""
        return DeviceInfo(
            identifiers={(DOMAIN, self._entry.entry_id)},
        )


class WhatsAppBroadcastEntity(SensorEntity):
    """Virtual 'All Accounts' Entity, geordnet unter dem zentralen Hub."""
    def __init__(self):
        self._attr_name = "WhatsApp Broadcast (All)"
        self._attr_unique_id = "whatsapp_bridge_broadcast_all"
        self._attr_icon = "mdi:whatsapp-arrow-up"
        self._attr_extra_state_attributes = {
            "is_broadcast": True
        }

    @property
    def state(self):
        return "Global"

    @property
    def device_info(self) -> DeviceInfo:
        """Ordnet diese Entität dem permanenten, zentralen Hub-Gerät zu."""
        return DeviceInfo(
            identifiers={(DOMAIN, "global_bridge_hub")},
        )


class WhatsAppStatusSensor(SensorEntity):
    """Echter Live-Status-Sensor, geordnet unter dem zentralen Hub."""

    def __init__(self, coordinator):
        self.coordinator = coordinator
        self._attr_name = "WhatsApp Bridge Status"
        self._attr_unique_id = "whatsapp_bridge_live_status_global"
        self._attr_icon = "mdi:whatsapp"

    @property
    def should_poll(self) -> bool:
        return False

    @property
    def available(self) -> bool:
        return self.coordinator.last_update_success

    @property
    def state(self):
        """Gibt den dynamischen Status aus der Add-on API zurück."""
        data = self.coordinator.data
        if not data:
            return "OFFLINE"
        
        if data.get("isReady"):
            return "CONNECTED"
        elif data.get("hasQr"):
            return "WAITING_FOR_SCAN"
        elif data.get("isInitializing"):
            return "INITIALIZING"
        
        return "UNKNOWN"

    @property
    def extra_state_attributes(self):
        """Zusätzliche Attribute für erweitertes Debugging."""
        data = self.coordinator.data
        if data:
            return {
                "client_state": data.get("clientState", "UNKNOWN"),
                "has_qr_code": data.get("hasQr", False)
            }
        return {}

    @property
    def device_info(self) -> DeviceInfo:
        """Ordnet diese Entität dem permanenten, zentralen Hub-Gerät zu."""
        return DeviceInfo(
            identifiers={(DOMAIN, "global_bridge_hub")},
        )

    async def async_added_to_hass(self):
        """Registrieren beim Live-Coordinator."""
        self.async_on_remove(
            self.coordinator.async_add_listener(self.async_write_ha_state)
        )