# services/inventory/app/api/internal_alert_trigger.py
"""
Internal API for triggering inventory alerts.
Used by demo session cloning to generate realistic inventory alerts.

URL Pattern: /api/v1/tenants/{tenant_id}/inventory/internal/alerts/trigger
This follows the tenant-scoped pattern so gateway can proxy correctly.
"""

from fastapi import APIRouter, HTTPException, Request, Path
from uuid import UUID
import structlog

logger = structlog.get_logger()

router = APIRouter()

# New URL pattern: tenant-scoped so gateway proxies to inventory service correctly
@router.post("/api/v1/tenants/{tenant_id}/inventory/internal/alerts/trigger")
async def trigger_inventory_alerts(
    tenant_id: UUID = Path(..., description="Tenant ID to check inventory for"),
    request: Request = None
) -> dict:
    """
    Trigger comprehensive inventory alert checks for a specific tenant (internal use only).

    This endpoint is called by the demo session cloning process after inventory
    data is seeded to generate realistic inventory alerts including:
    - Critical stock shortages
    - Expiring ingredients
    - Overstock situations

    Security: Protected by x-internal-service header check.
    """
    try:
        # Verify internal service header
        if not request or request.headers.get("x-internal-service") not in ["demo-session", "internal"]:
            logger.warning("Unauthorized internal API call", tenant_id=str(tenant_id))
            raise HTTPException(
                status_code=403,
                detail="This endpoint is for internal service use only"
            )

        # Get inventory scheduler from app state
        inventory_scheduler = getattr(request.app.state, 'inventory_scheduler', None)

        if not inventory_scheduler:
            logger.error("Inventory scheduler not initialized")
            raise HTTPException(
                status_code=500,
                detail="Inventory scheduler not available"
            )

        # Trigger comprehensive inventory alert checks for the specific tenant
        logger.info("Triggering comprehensive inventory alert checks", tenant_id=str(tenant_id))

        # Call the scheduler's manual trigger method
        result = await inventory_scheduler.trigger_manual_check(tenant_id)

        if result.get("success", False):
            logger.info(
                "Inventory alert checks completed successfully",
                tenant_id=str(tenant_id),
                alerts_generated=result.get("alerts_generated", 0)
            )
        else:
            logger.error(
                "Inventory alert checks failed",
                tenant_id=str(tenant_id),
                error=result.get("error", "Unknown error")
            )

        return result

    except HTTPException:
        raise
    except Exception as e:
        logger.error(
            "Error triggering inventory alerts",
            tenant_id=str(tenant_id),
            error=str(e),
            exc_info=True
        )
        raise HTTPException(
            status_code=500,
            detail=f"Failed to trigger inventory alerts: {str(e)}"
        )