from typing import List, Optional
from sqlalchemy.orm import Session
from sqlalchemy import select
from fastapi import HTTPException
from api.v1.modules.a76.invoice_settings.models import InvoiceSettings
from api.v1.modules.a76.invoice_settings.dto import InvoiceSettingsRequest, OperationType

def get_settings(
    db: Session,
    tenant_id: int,
    company_id: int,
    invoice_type: str,
    operation_type: OperationType
) -> Optional[InvoiceSettings]:
    """Retrieve settings for a specific context"""
    stmt = select(InvoiceSettings).where(
        InvoiceSettings.tenant_id == tenant_id,
        InvoiceSettings.company_id == company_id,
        InvoiceSettings.invoice_type == invoice_type,
        InvoiceSettings.operation_type == operation_type.value
    )
    return db.execute(stmt).scalar_one_or_none()

def list_settings(
    db: Session,
    tenant_id: int,
    company_id: int
) -> List[InvoiceSettings]:
    """List all settings for a company"""
    stmt = select(InvoiceSettings).where(
        InvoiceSettings.tenant_id == tenant_id,
        InvoiceSettings.company_id == company_id
    )
    return db.execute(stmt).scalars().all()

def upsert_settings(
    db: Session,
    tenant_id: int,
    company_id: int,
    settings_data: InvoiceSettingsRequest
) -> InvoiceSettings:
    """Create or update settings"""
    # Check if exists
    existing = get_settings(
        db, 
        tenant_id, 
        company_id, 
        settings_data.invoice_type, 
        settings_data.operation_type
    )
    
    if existing:
        existing.settings = settings_data.settings
        db.commit()
        db.refresh(existing)
        return existing
    
    # Create new
    new_settings = InvoiceSettings(
        tenant_id=tenant_id,
        company_id=company_id,
        invoice_type=settings_data.invoice_type,
        operation_type=settings_data.operation_type.value,
        settings=settings_data.settings
    )
    
    db.add(new_settings)
    db.commit()
    db.refresh(new_settings)
    return new_settings