"""
Device models — SIP phones, softphones, cell phones.

Devices register with the gateway and can receive transferred calls.
"""

from datetime import datetime
from enum import Enum
from typing import Optional

from pydantic import BaseModel, Field


class DeviceType(str, Enum):
    """Types of devices that can connect to the gateway."""

    SIP_PHONE = "sip_phone"  # Hardware SIP phone
    SOFTPHONE = "softphone"  # Software SIP client
    CELL = "cell"  # Cell phone (reached via PSTN trunk)
    TABLET = "tablet"  # Tablet with SIP client
    WEBRTC = "webrtc"  # Browser-based WebRTC client


class DeviceBase(BaseModel):
    """Shared device fields."""

    name: str  # "Office SIP Phone"
    type: DeviceType
    extension: Optional[int] = None  # 221-299, auto-assigned if omitted
    sip_uri: Optional[str] = None  # sip:robert@gateway.helu.ca
    phone_number: Optional[str] = None  # For PSTN devices (E.164)
    priority: int = 10  # Routing priority (lower = higher priority)
    capabilities: list[str] = Field(default_factory=lambda: ["voice"])


class Device(DeviceBase):
    """Full device model."""

    id: str
    is_online: bool = False
    last_seen: Optional[datetime] = None
    created_at: Optional[datetime] = None
    updated_at: Optional[datetime] = None

    @property
    def can_receive_call(self) -> bool:
        """Can this device receive a call right now?"""
        if self.type in (DeviceType.SIP_PHONE, DeviceType.SOFTPHONE, DeviceType.WEBRTC):
            return self.is_online and self.sip_uri is not None
        if self.type == DeviceType.CELL:
            return self.phone_number is not None
        return False


class DeviceCreate(DeviceBase):
    """Request model for registering a new device."""

    pass


class DeviceUpdate(BaseModel):
    """Request model for updating a device."""

    name: Optional[str] = None
    type: Optional[DeviceType] = None
    extension: Optional[int] = None
    sip_uri: Optional[str] = None
    phone_number: Optional[str] = None
    priority: Optional[int] = None
    capabilities: Optional[list[str]] = None


class DeviceStatus(BaseModel):
    """Lightweight device status for list views."""

    id: str
    name: str
    type: DeviceType
    is_online: bool
    last_seen: Optional[datetime] = None
    can_receive_call: bool