from fastapi import APIRouter, Depends, HTTPException, status
from sqlalchemy.ext.asyncio import AsyncSession
from app.core.database import get_db
from app.api.deps import require_admin
from app.models.models import User
from app.schemas.schemas import SystemSettingsResponse, SystemSettingsUpdate
from app.services.settings_service import get_all_settings, update_settings_service

router = APIRouter(prefix="/settings", tags=["System Settings"])

@router.get("", response_model=SystemSettingsResponse)
async def get_settings(
    db: AsyncSession = Depends(get_db),
    admin_user: User = Depends(require_admin)
):
    """Retrieve global system settings."""
    settings_dict = await get_all_settings(db)
    return {
        "storage_root": settings_dict.get("storage_root", ""),
        "global_quota_gb": int(settings_dict.get("global_quota_gb", 1000)),
        "default_client_quota_gb": int(settings_dict.get("default_client_quota_gb", 100)),
        "default_keep_daily": int(settings_dict.get("default_keep_daily", 7)),
        "default_keep_weekly": int(settings_dict.get("default_keep_weekly", 4)),
        "default_keep_monthly": int(settings_dict.get("default_keep_monthly", 12)),
    }

@router.put("", response_model=SystemSettingsResponse)
async def update_settings(
    payload: SystemSettingsUpdate,
    db: AsyncSession = Depends(get_db),
    admin_user: User = Depends(require_admin)
):
    """Update global system settings."""
    # Convert Pydantic model to a dict of values (filtering out None)
    updates = {k: v for k, v in payload.model_dump().items() if v is not None}
    
    try:
        settings_dict = await update_settings_service(db, updates)
    except ValueError as e:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=str(e)
        )
        
    return {
        "storage_root": settings_dict.get("storage_root", ""),
        "global_quota_gb": int(settings_dict.get("global_quota_gb", 1000)),
        "default_client_quota_gb": int(settings_dict.get("default_client_quota_gb", 100)),
        "default_keep_daily": int(settings_dict.get("default_keep_daily", 7)),
        "default_keep_weekly": int(settings_dict.get("default_keep_weekly", 4)),
        "default_keep_monthly": int(settings_dict.get("default_keep_monthly", 12)),
    }