# services/pos/app/api/sync.py
"""
POS Sync API Endpoints
Handles data synchronization with POS systems
"""

from fastapi import APIRouter, Depends, HTTPException, Path, Query, Body
from typing import List, 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, get_current_tenant_id_dep

router = APIRouter(tags=["sync"])
logger = structlog.get_logger()


@router.post("/tenants/{tenant_id}/pos/configurations/{config_id}/sync")
async def trigger_sync(
    sync_request: Dict[str, Any] = Body(...),
    tenant_id: UUID = Path(..., description="Tenant ID"),
    config_id: UUID = Path(..., description="Configuration ID"),
    current_tenant: str = Depends(get_current_tenant_id_dep),
    current_user: Dict[str, Any] = Depends(get_current_user_dep),
    db=Depends(get_db)
):
    """Trigger manual synchronization with POS system"""
    try:
        # Verify tenant access
        if str(tenant_id) != current_tenant:
            raise HTTPException(status_code=403, detail="Access denied to this tenant")
        
        sync_type = sync_request.get("sync_type", "incremental")  # full, incremental
        data_types = sync_request.get("data_types", ["transactions"])  # transactions, products, customers
        from_date = sync_request.get("from_date")
        to_date = sync_request.get("to_date")
        
        logger.info("Manual sync triggered",
                   tenant_id=tenant_id,
                   config_id=config_id,
                   sync_type=sync_type,
                   data_types=data_types,
                   user_id=current_user.get("user_id"))
        
        # TODO: Implement sync logic
        # TODO: Queue sync job for background processing
        # TODO: Return sync job ID for tracking
        
        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, config_id=config_id)
        raise HTTPException(status_code=500, detail=f"Failed to trigger sync: {str(e)}")


@router.get("/tenants/{tenant_id}/pos/configurations/{config_id}/sync/status")
async def get_sync_status(
    tenant_id: UUID = Path(..., description="Tenant ID"),
    config_id: UUID = Path(..., description="Configuration ID"),
    limit: int = Query(10, ge=1, le=100, description="Number of sync logs to return"),
    current_tenant: str = Depends(get_current_tenant_id_dep),
    db=Depends(get_db)
):
    """Get synchronization status and recent sync history"""
    try:
        # Verify tenant access
        if str(tenant_id) != current_tenant:
            raise HTTPException(status_code=403, detail="Access denied to this tenant")
        
        # TODO: Get sync status from database
        # TODO: Get recent sync logs
        
        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, config_id=config_id)
        raise HTTPException(status_code=500, detail=f"Failed to get sync status: {str(e)}")


@router.get("/tenants/{tenant_id}/pos/configurations/{config_id}/sync/logs")
async def get_sync_logs(
    tenant_id: UUID = Path(..., description="Tenant ID"),
    config_id: UUID = Path(..., description="Configuration ID"),
    limit: int = Query(50, ge=1, le=200, description="Number of logs to return"),
    offset: int = Query(0, ge=0, description="Number of logs to skip"),
    status: Optional[str] = Query(None, description="Filter by sync status"),
    sync_type: Optional[str] = Query(None, description="Filter by sync type"),
    data_type: Optional[str] = Query(None, description="Filter by data type"),
    current_tenant: str = Depends(get_current_tenant_id_dep),
    db=Depends(get_db)
):
    """Get detailed sync logs"""
    try:
        # Verify tenant access
        if str(tenant_id) != current_tenant:
            raise HTTPException(status_code=403, detail="Access denied to this tenant")
        
        # TODO: Implement log retrieval with filters
        
        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, config_id=config_id)
        raise HTTPException(status_code=500, detail=f"Failed to get sync logs: {str(e)}")


@router.get("/tenants/{tenant_id}/pos/transactions")
async def get_pos_transactions(
    tenant_id: UUID = Path(..., description="Tenant ID"),
    pos_system: Optional[str] = Query(None, description="Filter by POS system"),
    start_date: Optional[datetime] = Query(None, description="Start date filter"),
    end_date: Optional[datetime] = Query(None, description="End date filter"),
    status: Optional[str] = Query(None, description="Filter by transaction status"),
    is_synced: Optional[bool] = Query(None, description="Filter by sync status"),
    limit: int = Query(50, ge=1, le=200, description="Number of transactions to return"),
    offset: int = Query(0, ge=0, description="Number of transactions to skip"),
    current_tenant: str = Depends(get_current_tenant_id_dep),
    db=Depends(get_db)
):
    """Get POS transactions for a tenant"""
    try:
        # Verify tenant access
        if str(tenant_id) != current_tenant:
            raise HTTPException(status_code=403, detail="Access denied to this tenant")
        
        # TODO: Implement transaction retrieval with filters
        
        return {
            "transactions": [],
            "total": 0,
            "has_more": False,
            "summary": {
                "total_amount": 0,
                "transaction_count": 0,
                "sync_status": {
                    "synced": 0,
                    "pending": 0,
                    "failed": 0
                }
            }
        }
        
    except Exception as e:
        logger.error("Failed to get POS transactions", error=str(e), tenant_id=tenant_id)
        raise HTTPException(status_code=500, detail=f"Failed to get POS transactions: {str(e)}")


@router.post("/tenants/{tenant_id}/pos/transactions/{transaction_id}/sync")
async def sync_single_transaction(
    tenant_id: UUID = Path(..., description="Tenant ID"),
    transaction_id: UUID = Path(..., description="Transaction ID"),
    force: bool = Query(False, description="Force sync even if already synced"),
    current_tenant: str = Depends(get_current_tenant_id_dep),
    db=Depends(get_db)
):
    """Manually sync a single transaction to sales service"""
    try:
        # Verify tenant access
        if str(tenant_id) != current_tenant:
            raise HTTPException(status_code=403, detail="Access denied to this tenant")
        
        # TODO: Implement single transaction sync
        
        return {
            "message": "Transaction sync completed",
            "transaction_id": str(transaction_id),
            "sync_status": "success",
            "sales_record_id": "placeholder"
        }
        
    except Exception as e:
        logger.error("Failed to sync transaction", error=str(e), 
                    tenant_id=tenant_id, transaction_id=transaction_id)
        raise HTTPException(status_code=500, detail=f"Failed to sync transaction: {str(e)}")


@router.get("/tenants/{tenant_id}/pos/analytics/sync-performance")
async def get_sync_analytics(
    tenant_id: UUID = Path(..., description="Tenant ID"),
    days: int = Query(30, ge=1, le=365, description="Number of days to analyze"),
    current_tenant: str = Depends(get_current_tenant_id_dep),
    db=Depends(get_db)
):
    """Get sync performance analytics"""
    try:
        # Verify tenant access
        if str(tenant_id) != current_tenant:
            raise HTTPException(status_code=403, detail="Access denied to this tenant")
        
        # TODO: Implement analytics calculation
        
        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 sync analytics: {str(e)}")


@router.post("/tenants/{tenant_id}/pos/data/resync")
async def resync_failed_transactions(
    tenant_id: UUID = Path(..., description="Tenant ID"),
    days_back: int = Query(7, ge=1, le=90, description="How many days back to resync"),
    current_tenant: str = Depends(get_current_tenant_id_dep),
    current_user: Dict[str, Any] = Depends(get_current_user_dep),
    db=Depends(get_db)
):
    """Resync failed transactions from the specified time period"""
    try:
        # Verify tenant access
        if str(tenant_id) != current_tenant:
            raise HTTPException(status_code=403, detail="Access denied to this tenant")
        
        logger.info("Resync failed transactions requested",
                   tenant_id=tenant_id,
                   days_back=days_back,
                   user_id=current_user.get("user_id"))
        
        # TODO: Implement failed transaction resync
        
        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)}")