"""
POS Service Analytics API Endpoints
ANALYTICS layer - Channel and sync performance analytics
"""

from fastapi import APIRouter, Depends, HTTPException, Path, Query
from typing import Optional, Dict, Any
from uuid import UUID
from datetime import datetime
import structlog

from app.core.database import get_db
from shared.auth.decorators import get_current_user_dep
from shared.auth.access_control import require_user_role
from shared.routing import RouteBuilder

router = APIRouter()
logger = structlog.get_logger()
route_builder = RouteBuilder('pos')


@router.get(
    route_builder.build_analytics_route("sync-performance"),
    response_model=dict
)
@require_user_role(['viewer', 'member', 'admin', 'owner'])
async def get_sync_performance_analytics(
    tenant_id: UUID = Path(...),
    days: int = Query(30, ge=1, le=365),
    config_id: Optional[UUID] = Query(None),
    current_user: dict = Depends(get_current_user_dep),
    db=Depends(get_db)
):
    """Analyze sync performance metrics"""
    try:
        return {
            "period_days": days,
            "total_syncs": 0,
            "successful_syncs": 0,
            "failed_syncs": 0,
            "success_rate": 0.0,
            "average_duration_minutes": 0.0,
            "total_transactions_synced": 0,
            "total_revenue_synced": 0.0,
            "sync_frequency": {
                "daily_average": 0.0,
                "peak_day": None,
                "peak_count": 0
            },
            "error_analysis": {
                "common_errors": [],
                "error_trends": []
            }
        }
    except Exception as e:
        logger.error("Failed to get sync analytics", error=str(e), tenant_id=tenant_id)
        raise HTTPException(status_code=500, detail=f"Failed to get analytics: {str(e)}")


@router.get(
    route_builder.build_analytics_route("channel-performance"),
    response_model=dict
)
@require_user_role(['viewer', 'member', 'admin', 'owner'])
async def get_channel_performance_analytics(
    tenant_id: UUID = Path(...),
    days: int = Query(30, ge=1, le=365),
    pos_system: Optional[str] = Query(None),
    current_user: dict = Depends(get_current_user_dep),
    db=Depends(get_db)
):
    """Analyze POS channel performance by system"""
    try:
        return {
            "period_days": days,
            "pos_system": pos_system,
            "channel_metrics": {
                "total_transactions": 0,
                "total_revenue": 0.0,
                "average_transaction_value": 0.0,
                "transaction_growth_rate": 0.0
            },
            "system_breakdown": [],
            "performance_trends": {
                "daily_trends": [],
                "hourly_trends": [],
                "day_of_week_trends": []
            },
            "top_performing_channels": []
        }
    except Exception as e:
        logger.error("Failed to get channel analytics", error=str(e), tenant_id=tenant_id)
        raise HTTPException(status_code=500, detail=f"Failed to get channel analytics: {str(e)}")
