"""
POS Transactions API Endpoints
ATOMIC layer - Basic CRUD operations for POS transactions
"""

from fastapi import APIRouter, Depends, HTTPException, Path, Query
from typing import Optional
from uuid import UUID
from datetime import datetime
from decimal import Decimal
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
from app.services.pos_transaction_service import POSTransactionService
from app.schemas.pos_transaction import (
    POSTransactionResponse,
    POSTransactionListResponse,
    POSTransactionDashboardSummary
)

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


@router.get(
    route_builder.build_base_route("transactions"),
    response_model=POSTransactionListResponse
)
@require_user_role(['viewer', 'member', 'admin', 'owner'])
async def list_pos_transactions(
    tenant_id: UUID = Path(...),
    pos_system: Optional[str] = Query(None),
    start_date: Optional[datetime] = Query(None),
    end_date: Optional[datetime] = Query(None),
    status: Optional[str] = Query(None),
    is_synced: Optional[bool] = Query(None),
    limit: int = Query(50, ge=1, le=200),
    offset: int = Query(0, ge=0),
    current_user: dict = Depends(get_current_user_dep),
    db=Depends(get_db)
):
    """List POS transactions for a tenant"""
    try:
        service = POSTransactionService()

        transactions = await service.get_transactions_by_tenant(
            tenant_id=tenant_id,
            pos_system=pos_system,
            start_date=start_date,
            end_date=end_date,
            status=status,
            is_synced=is_synced,
            skip=offset,
            limit=limit
        )

        total = await service.count_transactions_by_tenant(
            tenant_id=tenant_id,
            pos_system=pos_system,
            start_date=start_date,
            end_date=end_date,
            status=status,
            is_synced=is_synced
        )

        # Get sync metrics for summary
        sync_metrics = await service.get_sync_metrics(tenant_id)

        # Calculate summary
        total_amount = sum(float(t.total_amount) for t in transactions if t.status == "completed")

        has_more = (offset + limit) < total

        return POSTransactionListResponse(
            transactions=transactions,
            total=total,
            has_more=has_more,
            summary={
                "total_amount": total_amount,
                "transaction_count": len(transactions),
                "sync_status": sync_metrics["sync_status"]
            }
        )
    except Exception as e:
        logger.error("Failed to list POS transactions", error=str(e), tenant_id=tenant_id)
        raise HTTPException(status_code=500, detail=f"Failed to list transactions: {str(e)}")


@router.get(
    route_builder.build_resource_detail_route("transactions", "transaction_id"),
    response_model=POSTransactionResponse
)
@require_user_role(['viewer', 'member', 'admin', 'owner'])
async def get_pos_transaction(
    tenant_id: UUID = Path(...),
    transaction_id: UUID = Path(...),
    current_user: dict = Depends(get_current_user_dep),
    db=Depends(get_db)
):
    """Get a specific POS transaction"""
    try:
        service = POSTransactionService()

        transaction = await service.get_transaction_with_items(
            transaction_id=transaction_id,
            tenant_id=tenant_id
        )

        if not transaction:
            raise HTTPException(status_code=404, detail="Transaction not found")

        return transaction
    except HTTPException:
        raise
    except Exception as e:
        logger.error("Failed to get POS transaction", error=str(e),
                    tenant_id=tenant_id, transaction_id=transaction_id)
        raise HTTPException(status_code=500, detail=f"Failed to get transaction: {str(e)}")


@router.get(
    route_builder.build_operations_route("transactions-dashboard"),
    response_model=POSTransactionDashboardSummary
)
@require_user_role(['viewer', 'member', 'admin', 'owner'])
async def get_transactions_dashboard(
    tenant_id: UUID = Path(...),
    current_user: dict = Depends(get_current_user_dep),
    db=Depends(get_db)
):
    """Get dashboard summary for POS transactions"""
    try:
        service = POSTransactionService()

        summary = await service.get_dashboard_summary(tenant_id)

        logger.info("Transactions dashboard retrieved",
                   tenant_id=str(tenant_id),
                   total_today=summary.total_transactions_today)

        return summary
    except Exception as e:
        logger.error("Failed to get transactions dashboard", error=str(e), tenant_id=tenant_id)
        raise HTTPException(status_code=500, detail=f"Failed to get dashboard: {str(e)}")