from fastapi import APIRouter

from common.log.module_logger import ModuleLogger
from backend.services.prometheus_metrics_service import PrometheusMetricsService

router = APIRouter()

# Initialize service and logger
prometheus_service = PrometheusMetricsService()
module_logger = ModuleLogger(__file__)


@router.get("/prometheus/product/{product_id}/available-metrics")
async def get_available_metrics(product_id: str):
    """
    Get list of available metrics for a specific product.
    
    Args:
        product_id: Product ID to get metrics for (required).
    
    Returns a list of metric names that have predefined PromQL queries for the specified product.
    """
    await module_logger.log_info(f"Getting available metrics list for product_id: {product_id}")
    metrics = prometheus_service.get_available_metrics(product_id)

    return {
        "product_id": product_id,
        "available_metrics": metrics,
        "total_count": len(metrics),
        "description": f"List of metrics with predefined PromQL queries for product '{product_id}'"
    }