"""
POS Operations API Endpoints
BUSINESS layer - Sync operations, webhooks, reconciliation, and test connection
"""

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

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, admin_role_required
from shared.routing import RouteBuilder

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


# ============================================================================
# Sync Operations
# ============================================================================

@router.post(
    route_builder.build_operations_route("sync"),
    response_model=dict
)
@require_user_role(['member', 'admin', 'owner'])
async def trigger_sync(
    sync_request: Dict[str, Any],
    tenant_id: UUID = Path(...),
    current_user: dict = Depends(get_current_user_dep),
    db=Depends(get_db)
):
    """Trigger manual synchronization with POS system (Member+)"""
    try:
        sync_type = sync_request.get("sync_type", "incremental")
        data_types = sync_request.get("data_types", ["transactions"])
        config_id = sync_request.get("config_id")

        logger.info("Manual sync triggered",
                   tenant_id=tenant_id,
                   config_id=config_id,
                   sync_type=sync_type,
                   user_id=current_user.get("user_id"))

        return {
            "message": "Sync triggered successfully",
            "sync_id": "placeholder-sync-id",
            "status": "queued",
            "sync_type": sync_type,
            "data_types": data_types,
            "estimated_duration": "5-10 minutes"
        }
    except Exception as e:
        logger.error("Failed to trigger sync", error=str(e), tenant_id=tenant_id)
        raise HTTPException(status_code=500, detail=f"Failed to trigger sync: {str(e)}")


@router.get(
    route_builder.build_operations_route("sync-status"),
    response_model=dict
)
@require_user_role(['viewer', 'member', 'admin', 'owner'])
async def get_sync_status(
    tenant_id: UUID = Path(...),
    config_id: Optional[UUID] = Query(None),
    limit: int = Query(10, ge=1, le=100),
    current_user: dict = Depends(get_current_user_dep),
    db=Depends(get_db)
):
    """Get synchronization status and recent sync history"""
    try:
        return {
            "current_sync": None,
            "last_successful_sync": None,
            "recent_syncs": [],
            "sync_health": {
                "status": "healthy",
                "success_rate": 95.5,
                "average_duration_minutes": 3.2,
                "last_error": None
            }
        }
    except Exception as e:
        logger.error("Failed to get sync status", error=str(e), tenant_id=tenant_id)
        raise HTTPException(status_code=500, detail=f"Failed to get sync status: {str(e)}")


@router.get(
    route_builder.build_operations_route("sync-logs"),
    response_model=dict
)
@require_user_role(['viewer', 'member', 'admin', 'owner'])
async def get_sync_logs(
    tenant_id: UUID = Path(...),
    config_id: Optional[UUID] = Query(None),
    limit: int = Query(50, ge=1, le=200),
    offset: int = Query(0, ge=0),
    status: Optional[str] = Query(None),
    sync_type: Optional[str] = Query(None),
    current_user: dict = Depends(get_current_user_dep),
    db=Depends(get_db)
):
    """Get detailed sync logs"""
    try:
        return {
            "logs": [],
            "total": 0,
            "has_more": False
        }
    except Exception as e:
        logger.error("Failed to get sync logs", error=str(e), tenant_id=tenant_id)
        raise HTTPException(status_code=500, detail=f"Failed to get sync logs: {str(e)}")


@router.post(
    route_builder.build_operations_route("resync-failed"),
    response_model=dict
)
@admin_role_required
async def resync_failed_transactions(
    tenant_id: UUID = Path(...),
    days_back: int = Query(7, ge=1, le=90),
    current_user: dict = Depends(get_current_user_dep),
    db=Depends(get_db)
):
    """Resync failed transactions from the specified time period (Admin/Owner only)"""
    try:
        logger.info("Resync failed transactions requested",
                   tenant_id=tenant_id,
                   days_back=days_back,
                   user_id=current_user.get("user_id"))

        return {
            "message": "Resync job queued successfully",
            "job_id": "placeholder-resync-job-id",
            "scope": f"Failed transactions from last {days_back} days",
            "estimated_transactions": 0
        }
    except Exception as e:
        logger.error("Failed to queue resync job", error=str(e), tenant_id=tenant_id)
        raise HTTPException(status_code=500, detail=f"Failed to queue resync job: {str(e)}")


@router.post(
    route_builder.build_operations_route("test-connection"),
    response_model=dict
)
@admin_role_required
async def test_pos_connection(
    tenant_id: UUID = Path(...),
    config_id: UUID = Query(...),
    current_user: dict = Depends(get_current_user_dep),
    db=Depends(get_db)
):
    """Test connection to POS system (Admin/Owner only)"""
    try:
        return {
            "status": "success",
            "message": "Connection test successful",
            "tested_at": datetime.utcnow().isoformat(),
            "config_id": str(config_id)
        }
    except Exception as e:
        logger.error("Failed to test POS connection", error=str(e),
                    tenant_id=tenant_id, config_id=config_id)
        raise HTTPException(status_code=500, detail=f"Failed to test connection: {str(e)}")


# ============================================================================
# Webhook Operations
# ============================================================================

@router.post(
    route_builder.build_webhook_route("{pos_system}"),
    response_model=dict
)
async def receive_webhook(
    request: Request,
    pos_system: str = Path(..., description="POS system name"),
    content_type: Optional[str] = Header(None),
    x_signature: Optional[str] = Header(None),
    x_webhook_signature: Optional[str] = Header(None),
    authorization: Optional[str] = Header(None)
):
    """
    Receive webhooks from POS systems
    Supports Square, Toast, and Lightspeed webhook formats
    """
    try:
        # Validate POS system
        supported_systems = ["square", "toast", "lightspeed"]
        if pos_system.lower() not in supported_systems:
            raise HTTPException(status_code=400, detail=f"Unsupported POS system: {pos_system}")

        # Get request details
        method = request.method
        url_path = str(request.url.path)
        query_params = dict(request.query_params)
        headers = dict(request.headers)

        # Get client IP
        client_ip = None
        if hasattr(request, 'client') and request.client:
            client_ip = request.client.host

        # Read payload
        try:
            body = await request.body()
            raw_payload = body.decode('utf-8') if body else ""
            payload_size = len(body) if body else 0

            # Parse JSON if possible
            parsed_payload = None
            if raw_payload:
                try:
                    parsed_payload = json.loads(raw_payload)
                except json.JSONDecodeError:
                    logger.warning("Failed to parse webhook payload as JSON",
                                 pos_system=pos_system, payload_size=payload_size)
        except Exception as e:
            logger.error("Failed to read webhook payload", error=str(e))
            raise HTTPException(status_code=400, detail="Failed to read request payload")

        # Determine signature from various header formats
        signature = x_signature or x_webhook_signature or authorization

        # Log webhook receipt
        logger.info("Webhook received",
                   pos_system=pos_system,
                   method=method,
                   url_path=url_path,
                   payload_size=payload_size,
                   client_ip=client_ip,
                   has_signature=bool(signature),
                   content_type=content_type)

        # TODO: Store webhook log in database
        # TODO: Verify webhook signature
        # TODO: Extract tenant_id from payload
        # TODO: Process webhook based on POS system type
        # TODO: Queue for async processing if needed

        # Parse webhook type based on POS system
        webhook_type = None
        event_id = None

        if parsed_payload:
            if pos_system.lower() == "square":
                webhook_type = parsed_payload.get("type")
                event_id = parsed_payload.get("event_id")
            elif pos_system.lower() == "toast":
                webhook_type = parsed_payload.get("eventType")
                event_id = parsed_payload.get("guid")
            elif pos_system.lower() == "lightspeed":
                webhook_type = parsed_payload.get("action")
                event_id = parsed_payload.get("id")

        logger.info("Webhook processed successfully",
                   pos_system=pos_system,
                   webhook_type=webhook_type,
                   event_id=event_id)

        # Return appropriate response based on POS system requirements
        if pos_system.lower() == "square":
            return {"status": "success"}
        elif pos_system.lower() == "toast":
            return {"success": True}
        elif pos_system.lower() == "lightspeed":
            return {"received": True}
        else:
            return {"status": "received"}

    except HTTPException:
        raise
    except Exception as e:
        logger.error("Webhook processing failed",
                    error=str(e),
                    pos_system=pos_system)

        # Return 500 to trigger POS system retry
        raise HTTPException(status_code=500, detail="Webhook processing failed")


@router.get(
    route_builder.build_webhook_route("{pos_system}/status"),
    response_model=dict
)
async def get_webhook_status(pos_system: str = Path(..., description="POS system name")):
    """Get webhook endpoint status for a POS system"""
    try:
        supported_systems = ["square", "toast", "lightspeed"]
        if pos_system.lower() not in supported_systems:
            raise HTTPException(status_code=400, detail=f"Unsupported POS system: {pos_system}")

        return {
            "pos_system": pos_system,
            "status": "active",
            "endpoint": f"/api/v1/webhooks/{pos_system}",
            "supported_events": _get_supported_events(pos_system),
            "last_received": None,
            "total_received": 0
        }
    except Exception as e:
        logger.error("Failed to get webhook status", error=str(e), pos_system=pos_system)
        raise HTTPException(status_code=500, detail=f"Failed to get webhook status: {str(e)}")


def _get_supported_events(pos_system: str) -> Dict[str, Any]:
    """Get supported webhook events for each POS system"""
    events = {
        "square": [
            "payment.created",
            "payment.updated",
            "order.created",
            "order.updated",
            "order.fulfilled",
            "inventory.count.updated"
        ],
        "toast": [
            "OrderCreated",
            "OrderUpdated",
            "OrderPaid",
            "OrderCanceled",
            "OrderVoided"
        ],
        "lightspeed": [
            "order.created",
            "order.updated",
            "order.paid",
            "sale.created",
            "sale.updated"
        ]
    }

    return {
        "events": events.get(pos_system.lower(), []),
        "format": "JSON",
        "authentication": "signature_verification"
    }