from fastapi import APIRouter, HTTPException, Depends, Body, Path
from typing import List, Dict, Any
from fastapi import status
from datetime import datetime
from dataclasses import dataclass

# Import interfaces
from modules.auth import getCurrentActiveUser, getUserContext
from modules.gatewayInterface import getGatewayInterface
from modules.gatewayModel import Mandate

# Determine all attributes of the model
def getModelAttributes(modelClass):
    return [attr for attr in dir(modelClass) 
            if not callable(getattr(modelClass, attr)) 
            and not attr.startswith('_')
            and attr not in ('metadata', 'query', 'query_class', 'label', 'field_labels')]

# Model attributes for Mandate
mandateAttributes = getModelAttributes(Mandate)

@dataclass
class AppContext:
    """Context object for all required connections and user information"""
    mandateId: int
    userId: int
    interfaceData: Any  # Gateway Interface

async def getContext(currentUser: Dict[str, Any]) -> AppContext:
    """Creates a central context object with all required connections"""
    mandateId, userId = await getUserContext(currentUser)
    interfaceData = getGatewayInterface(mandateId, userId)
    
    return AppContext(
        mandateId=mandateId,
        userId=userId,
        interfaceData=interfaceData
    )

# Create router for mandate endpoints
router = APIRouter(
    prefix="/api/mandates",
    tags=["Mandates"],
    responses={404: {"description": "Not found"}}
)

@router.get("", response_model=List[Dict[str, Any]])
async def getMandates(currentUser: Dict[str, Any] = Depends(getCurrentActiveUser)):
    """Get all available mandates (only for SysAdmin users)"""
    context = await getContext(currentUser)
    
    # Permission check
    if currentUser.get("privilege") != "sysadmin":
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN,
            detail="Only system administrators can access all mandates"
        )
    
    # Get mandates
    return context.interfaceData.getAllMandates()

@router.post("", response_model=Dict[str, Any])
async def createMandate(
    mandate: Dict[str, Any] = Body(...),
    currentUser: Dict[str, Any] = Depends(getCurrentActiveUser)
):
    """Create a new mandate (only for SysAdmin users)"""
    context = await getContext(currentUser)
    
    # Permission check
    if currentUser.get("privilege") != "sysadmin":
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN,
            detail="Only system administrators can create mandates"
        )
    
    # Set attributes from the request dynamically
    mandateData = {}
    for attr in mandateAttributes:
        if attr in mandate:
            mandateData[attr] = mandate[attr]
    
    # Default values for missing fields
    mandateData.setdefault("name", "New Mandate")
    mandateData.setdefault("language", "de")
    
    # Create mandate
    newMandate = context.interfaceData.createMandate(**mandateData)
    
    return newMandate

@router.get("/{mandateId}", response_model=Dict[str, Any])
async def getMandate(
    mandateId: int,
    currentUser: Dict[str, Any] = Depends(getCurrentActiveUser)
):
    """Get a specific mandate"""
    context = await getContext(currentUser)
    
    # Permission check
    # Admin can only see their own mandate, SysAdmin can see all
    isAdmin = currentUser.get("privilege") == "admin"
    isSysadmin = currentUser.get("privilege") == "sysadmin"
    isOwnMandate = context.mandateId == mandateId
    
    if (isAdmin and not isOwnMandate) and not isSysadmin:
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN,
            detail="No permission to access this mandate"
        )
    
    # Get mandate
    mandate = context.interfaceData.getMandate(mandateId)
    if not mandate:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=f"Mandate with ID {mandateId} not found"
        )
    
    return mandate

@router.put("/{mandateId}", response_model=Dict[str, Any])
async def updateMandate(
    mandateId: int = Path(..., description="ID of the mandate to update"),
    mandateData: Dict[str, Any] = Body(..., description="Updated mandate data"),
    currentUser: Dict[str, Any] = Depends(getCurrentActiveUser)
):
    """Update an existing mandate"""
    context = await getContext(currentUser)
    
    # Mandate exists?
    mandate = context.interfaceData.getMandate(mandateId)
    if not mandate:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=f"Mandate with ID {mandateId} not found"
        )
    
    # Permission check
    isAdmin = currentUser.get("privilege") == "admin"
    isSysadmin = currentUser.get("privilege") == "sysadmin"
    isOwnMandate = context.mandateId == mandateId
    
    if (isAdmin and not isOwnMandate) and not isSysadmin:
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN,
            detail="No permission to update this mandate"
        )
    
    # Dynamically filter attributes from the request into updateData
    updateData = {}
    for attr in mandateAttributes:
        if attr in mandateData:
            updateData[attr] = mandateData[attr]
    
    # Update mandate
    updatedMandate = context.interfaceData.updateMandate(
        mandateId=mandateId,
        mandateData=updateData
    )
    
    return updatedMandate

@router.delete("/{mandateId}", status_code=status.HTTP_204_NO_CONTENT)
async def deleteMandate(
    mandateId: int = Path(..., description="ID of the mandate to delete"),
    currentUser: Dict[str, Any] = Depends(getCurrentActiveUser)
):
    """Delete a mandate, including all associated users and referenced objects"""
    context = await getContext(currentUser)
    
    # Mandate exists?
    mandate = context.interfaceData.getMandate(mandateId)
    if not mandate:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=f"Mandate with ID {mandateId} not found"
        )
    
    # Permission check
    isAdmin = currentUser.get("privilege") == "admin"
    isSysadmin = currentUser.get("privilege") == "sysadmin"
    isOwnMandate = context.mandateId == mandateId
    
    if (isAdmin and not isOwnMandate) and not isSysadmin:
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN,
            detail="No permission to delete this mandate"
        )
    
    # Delete mandate
    success = context.interfaceData.deleteMandate(mandateId)
    if not success:
        raise HTTPException(
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
            detail=f"Error deleting mandate with ID {mandateId}"
        )
    
    return None