"""Async batch telemetry emitter."""

from dataclasses import dataclass, field
from typing import Dict, Any, TYPE_CHECKING
from datetime import datetime
from queue import Queue
from threading import Thread, Lock

if TYPE_CHECKING:
    from ..transport.base import BaseTransport


@dataclass
class TelemetryEvent:
    """Telemetry event."""
    
    event_type: str
    timestamp: datetime = field(default_factory=datetime.utcnow)
    data: Dict[str, Any] = field(default_factory=dict)


class TelemetryEmitter:
    """Async batch telemetry emitter with queue."""
    
    def __init__(
        self,
        transport: "BaseTransport",
        batch_size: int = 100,
        flush_interval_ms: int = 5000
    ):
        """Initialize telemetry emitter.
        
        Args:
            transport: Transport for sending telemetry
            batch_size: Number of events to batch before sending
            flush_interval_ms: Interval for automatic flush
        """
        self.transport = transport
        self.batch_size = batch_size
        self.flush_interval_ms = flush_interval_ms
        self._queue: Queue = Queue()
        self._lock = Lock()
        self._worker: Thread = None
        self._shutdown_flag = False
    
    def emit(self, event: TelemetryEvent) -> None:
        """Emit telemetry event (non-blocking, queued).
        
        Args:
            event: Telemetry event to emit
        """
        raise NotImplementedError("Stub")
    
    def flush(self) -> None:
        """Force send queued events."""
        raise NotImplementedError("Stub")
    
    def shutdown(self) -> None:
        """Flush and stop telemetry worker."""
        raise NotImplementedError("Stub")
