"""
Tenant API - ATOMIC operations
Handles basic CRUD operations for tenants
"""

import structlog
from fastapi import APIRouter, Depends, HTTPException, status, Path, Query
from typing import Dict, Any, List
from uuid import UUID

from app.schemas.tenants import TenantResponse, TenantUpdate
from app.services.tenant_service import EnhancedTenantService
from shared.auth.decorators import get_current_user_dep
from shared.auth.access_control import admin_role_required
from shared.routing.route_builder import RouteBuilder
from shared.database.base import create_database_manager
from shared.monitoring.metrics import track_endpoint_metrics

logger = structlog.get_logger()
router = APIRouter()
route_builder = RouteBuilder("tenants")

# Dependency injection for enhanced tenant service
def get_enhanced_tenant_service():
    try:
        from app.core.config import settings
        database_manager = create_database_manager(settings.DATABASE_URL, "tenant-service")
        return EnhancedTenantService(database_manager)
    except Exception as e:
        logger.error("Failed to create enhanced tenant service", error=str(e))
        raise HTTPException(status_code=500, detail="Service initialization failed")

@router.get(route_builder.build_base_route("", include_tenant_prefix=False), response_model=List[TenantResponse])
@track_endpoint_metrics("tenants_list")
async def get_active_tenants(
    skip: int = Query(0, ge=0, description="Number of records to skip"),
    limit: int = Query(100, ge=1, le=1000, description="Maximum number of records to return"),
    current_user: Dict[str, Any] = Depends(get_current_user_dep),
    tenant_service: EnhancedTenantService = Depends(get_enhanced_tenant_service)
):
    """Get all active tenants - Available to service accounts and admins"""

    logger.info(
        "Get active tenants request received",
        skip=skip,
        limit=limit,
        user_id=current_user.get("user_id"),
        user_type=current_user.get("type", "user"),
        is_service=current_user.get("type") == "service",
        role=current_user.get("role"),
        service_name=current_user.get("service", "none")
    )

    # Allow service accounts to call this endpoint
    if current_user.get("type") != "service":
        # For non-service users, could add additional role checks here if needed
        logger.debug(
            "Non-service user requesting active tenants",
            user_id=current_user.get("user_id"),
            role=current_user.get("role")
        )

    tenants = await tenant_service.get_active_tenants(skip=skip, limit=limit)

    logger.debug(
        "Get active tenants successful",
        count=len(tenants),
        skip=skip,
        limit=limit
    )

    return tenants

@router.get(route_builder.build_base_route("{tenant_id}", include_tenant_prefix=False), response_model=TenantResponse)
@track_endpoint_metrics("tenant_get")
async def get_tenant(
    tenant_id: UUID = Path(..., description="Tenant ID"),
    current_user: Dict[str, Any] = Depends(get_current_user_dep),
    tenant_service: EnhancedTenantService = Depends(get_enhanced_tenant_service)
):
    """Get tenant by ID - ATOMIC operation - ENHANCED with logging"""

    logger.info(
        "Tenant GET request received",
        tenant_id=str(tenant_id),
        user_id=current_user.get("user_id"),
        user_type=current_user.get("type", "user"),
        is_service=current_user.get("type") == "service",
        role=current_user.get("role"),
        service_name=current_user.get("service", "none")
    )

    tenant = await tenant_service.get_tenant_by_id(str(tenant_id))
    if not tenant:
        logger.warning(
            "Tenant not found",
            tenant_id=str(tenant_id),
            user_id=current_user.get("user_id")
        )
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail="Tenant not found"
        )

    logger.debug(
        "Tenant GET request successful",
        tenant_id=str(tenant_id),
        user_id=current_user.get("user_id")
    )

    return tenant

@router.put(route_builder.build_base_route("{tenant_id}", include_tenant_prefix=False), response_model=TenantResponse)
@admin_role_required
async def update_tenant(
    update_data: TenantUpdate,
    tenant_id: UUID = Path(..., description="Tenant ID"),
    current_user: Dict[str, Any] = Depends(get_current_user_dep),
    tenant_service: EnhancedTenantService = Depends(get_enhanced_tenant_service)
):
    """Update tenant information - ATOMIC operation (Admin+ only)"""

    try:
        result = await tenant_service.update_tenant(
            str(tenant_id),
            update_data,
            current_user["user_id"]
        )
        return result

    except HTTPException:
        raise
    except Exception as e:
        logger.error("Tenant update failed",
                    tenant_id=str(tenant_id),
                    user_id=current_user["user_id"],
                    error=str(e))
        raise HTTPException(
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
            detail="Tenant update failed"
        )

@router.get(route_builder.build_base_route("user/{user_id}/tenants", include_tenant_prefix=False), response_model=List[TenantResponse])
@track_endpoint_metrics("user_tenants_list")
async def get_user_tenants(
    user_id: str = Path(..., description="User ID"),
    current_user: Dict[str, Any] = Depends(get_current_user_dep),
    tenant_service: EnhancedTenantService = Depends(get_enhanced_tenant_service)
):
    """Get all tenants accessible by a user"""

    logger.info(
        "Get user tenants request received",
        user_id=user_id,
        requesting_user=current_user.get("user_id"),
        is_demo=current_user.get("is_demo", False)
    )

    # Allow demo users to access tenant information for demo-user
    is_demo_user = current_user.get("is_demo", False)
    is_service_account = current_user.get("type") == "service"

    # For demo sessions, when frontend requests with "demo-user", use the actual demo owner ID
    actual_user_id = user_id
    if is_demo_user and user_id == "demo-user":
        actual_user_id = current_user.get("user_id")
        logger.info(
            "Demo session: mapping demo-user to actual owner",
            requested_user_id=user_id,
            actual_user_id=actual_user_id
        )

    if current_user.get("user_id") != actual_user_id and not is_service_account and not (is_demo_user and user_id == "demo-user"):
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN,
            detail="Can only access own tenants"
        )

    try:
        # For demo sessions, use session-specific filtering to prevent cross-session data leakage
        if is_demo_user:
            demo_session_id = current_user.get("demo_session_id")
            demo_account_type = current_user.get("demo_account_type", "professional")

            logger.info(
                "Demo session detected for get_user_tenants",
                user_id=user_id,
                actual_user_id=actual_user_id,
                demo_session_id=demo_session_id,
                demo_account_type=demo_account_type,
                has_session_id=bool(demo_session_id)
            )

            if demo_session_id:
                # Get only tenants for this specific demo session
                tenants = await tenant_service.get_virtual_tenants_for_session(demo_session_id, demo_account_type)
                logger.info(
                    "Get demo session tenants successful",
                    user_id=user_id,
                    demo_session_id=demo_session_id,
                    demo_account_type=demo_account_type,
                    tenant_count=len(tenants),
                    tenant_ids=[str(t.id) for t in tenants] if tenants else []
                )
                return tenants
            else:
                logger.warning(
                    "Demo user without session ID - falling back to regular user tenants",
                    user_id=actual_user_id
                )

        # Regular users or demo fallback: get tenants by ownership and membership
        tenants = await tenant_service.get_user_tenants(actual_user_id)

        logger.debug(
            "Get user tenants successful",
            user_id=user_id,
            tenant_count=len(tenants)
        )

        return tenants

    except HTTPException:
        raise
    except Exception as e:
        logger.error("Get user tenants failed",
                    user_id=user_id,
                    error=str(e))
        raise HTTPException(
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
            detail="Failed to get user tenants"
        )

@router.delete(route_builder.build_base_route("{tenant_id}", include_tenant_prefix=False))
@track_endpoint_metrics("tenant_delete")
async def delete_tenant(
    tenant_id: UUID = Path(..., description="Tenant ID"),
    current_user: Dict[str, Any] = Depends(get_current_user_dep),
    tenant_service: EnhancedTenantService = Depends(get_enhanced_tenant_service)
):
    """Delete tenant and all associated data - ATOMIC operation (Owner/Admin or System only)"""

    logger.info(
        "Tenant DELETE request received",
        tenant_id=str(tenant_id),
        user_id=current_user.get("user_id"),
        user_type=current_user.get("type", "user"),
        is_service=current_user.get("type") == "service",
        role=current_user.get("role"),
        service_name=current_user.get("service", "none")
    )

    try:
        # Allow internal service calls to bypass admin check
        skip_admin_check = current_user.get("type") == "service"

        result = await tenant_service.delete_tenant(
            str(tenant_id),
            requesting_user_id=current_user.get("user_id"),
            skip_admin_check=skip_admin_check
        )

        logger.info(
            "Tenant DELETE request successful",
            tenant_id=str(tenant_id),
            user_id=current_user.get("user_id"),
            deleted_items=result.get("deleted_items")
        )

        return {
            "message": "Tenant deleted successfully",
            "summary": result
        }

    except HTTPException:
        raise
    except Exception as e:
        logger.error("Tenant deletion failed",
                    tenant_id=str(tenant_id),
                    user_id=current_user.get("user_id"),
                    error=str(e))
        raise HTTPException(
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
            detail="Tenant deletion failed"
        )
