"""Queue and wait-time models."""

from dataclasses import dataclass, field
from datetime import datetime
from typing import Optional
from enum import Enum
import uuid


class QueueCategory(Enum):
    """Category of service queue."""

    FOOD = "food"
    MERCHANDISE = "merch"
    RESTROOM = "restroom"
    ENTRY = "entry"
    EXIT = "exit"
    TICKET = "ticket"

    @property
    def icon(self):
        return {
            "food": "🍕",
            "merch": "🛍️",
            "restroom": "🚻",
            "entry": "🚪",
            "exit": "🚶",
            "ticket": "🎫",
        }[self.value]

    @property
    def label(self):
        return {
            "food": "Food & Beverages",
            "merch": "Merchandise",
            "restroom": "Restrooms",
            "entry": "Entry Gates",
            "exit": "Exit Gates",
            "ticket": "Ticket Counter",
        }[self.value]


@dataclass
class QueueStation:
    """A single service station (e.g., one food stall)."""

    id: str
    name: str
    category: str  # QueueCategory value
    zone_id: str
    current_length: int = 0
    avg_service_time_sec: float = 45.0
    is_open: bool = True
    lat: float = 0.0
    lng: float = 0.0

    @property
    def estimated_wait_minutes(self) -> float:
        if not self.is_open or self.current_length == 0:
            return 0.0
        return round((self.current_length * self.avg_service_time_sec) / 60, 1)

    @property
    def wait_level(self) -> str:
        wait = self.estimated_wait_minutes
        if wait < 5:
            return "short"
        elif wait < 15:
            return "moderate"
        elif wait < 30:
            return "long"
        else:
            return "very_long"

    @property
    def wait_color(self) -> str:
        return {
            "short": "#22c55e",
            "moderate": "#f59e0b",
            "long": "#ef4444",
            "very_long": "#18181b",
        }[self.wait_level]

    def to_dict(self) -> dict:
        return {
            "id": self.id,
            "name": self.name,
            "category": self.category,
            "category_icon": QueueCategory(self.category).icon,
            "category_label": QueueCategory(self.category).label,
            "zone_id": self.zone_id,
            "current_length": self.current_length,
            "estimated_wait_minutes": self.estimated_wait_minutes,
            "wait_level": self.wait_level,
            "wait_color": self.wait_color,
            "is_open": self.is_open,
            "lat": self.lat,
            "lng": self.lng,
        }


@dataclass
class VirtualQueueTicket:
    """A virtual queue reservation for an attendee."""

    id: str = field(default_factory=lambda: str(uuid.uuid4())[:8].upper())
    user_id: str = ""
    station_id: str = ""
    station_name: str = ""
    category: str = ""
    position: int = 0
    estimated_ready_time: Optional[datetime] = None
    status: str = "waiting"  # waiting, ready, served, expired
    created_at: datetime = field(default_factory=datetime.utcnow)

    def to_dict(self) -> dict:
        return {
            "id": self.id,
            "user_id": self.user_id,
            "station_id": self.station_id,
            "station_name": self.station_name,
            "category": self.category,
            "category_icon": QueueCategory(self.category).icon if self.category else "",
            "position": self.position,
            "estimated_ready_time": (
                self.estimated_ready_time.isoformat()
                if self.estimated_ready_time
                else None
            ),
            "status": self.status,
            "created_at": self.created_at.isoformat(),
        }