from typing import Optional, Dict, Any
from sqlalchemy.orm import Session
from email_validator import validate_email, EmailNotValidError
from models.contact_form import ContactForm
from schemas.contact_form import ContactFormCreate

def create_contact_form(db: Session, contact_form_data: ContactFormCreate) -> ContactForm:
    """
    Creates a new contact form submission in the database after validating inputs.

    Args:
        db (Session): The database session.
        contact_form_data (ContactFormCreate): The data for the contact form to create.

    Returns:
        ContactForm: The newly created contact form object.

    Raises:
        HTTPException: If any required field is missing or invalid.
    """
    # Create a new contact form instance
    db_contact_form = ContactForm(
        name=contact_form_data.name,
        email=contact_form_data.email,
        message=contact_form_data.message
    )
    
    # Add to database, commit, and refresh
    db.add(db_contact_form)
    db.commit()
    db.refresh(db_contact_form)
    
    return db_contact_form

def validate_contact_form_data(data: Dict[str, Any]) -> Dict[str, str]:
    """
    Validates contact form data, checking for required fields and using 
    email_validator package for email validation.
    
    Args:
        data (Dict[str, Any]): The contact form data to validate.
        
    Returns:
        Dict[str, str]: A dictionary of validation errors, empty if validation passes.
    """
    errors = {}
    
    # Check required fields with specific error messages
    if not data.get("name"):
        errors["name"] = "Name is required"
    elif not isinstance(data.get("name"), str) or len(data.get("name").strip()) == 0:
        errors["name"] = "Name must be a non-empty string"
    
    # Email validation with detailed error handling
    if not data.get("email"):
        errors["email"] = "Email is required"
    else:
        try:
            # Validate email format using email_validator package
            validate_email(data["email"], check_deliverability=True)
        except EmailNotValidError as e:
            errors["email"] = f"Invalid email format: {str(e)}"
    
    # Message validation
    if not data.get("message"):
        errors["message"] = "Message is required"
    elif not isinstance(data.get("message"), str) or len(data.get("message").strip()) == 0:
        errors["message"] = "Message must be a non-empty string"
    
    return errors

def get_contact_form_by_id(db: Session, contact_form_id: str) -> Optional[ContactForm]:
    """
    Retrieves a contact form submission by its ID.

    Args:
        db (Session): The database session.
        contact_form_id (str): The ID of the contact form to retrieve.

    Returns:
        Optional[ContactForm]: The contact form object if found, otherwise None.
    """
    return db.query(ContactForm).filter(ContactForm.id == contact_form_id).first()

def get_all_contact_forms(db: Session, skip: int = 0, limit: int = 100) -> list[ContactForm]:
    """
    Retrieves all contact form submissions with pagination.

    Args:
        db (Session): The database session.
        skip (int, optional): Number of records to skip. Defaults to 0.
        limit (int, optional): Maximum number of records to return. Defaults to 100.

    Returns:
        list[ContactForm]: A list of contact form objects.
    """
    return db.query(ContactForm).offset(skip).limit(limit).all()

def get_contact_forms_by_email(db: Session, email: str) -> list[ContactForm]:
    """
    Retrieves all contact form submissions from a specific email address.

    Args:
        db (Session): The database session.
        email (str): The email address to filter by.

    Returns:
        list[ContactForm]: A list of contact form objects from the specified email.
    """
    return db.query(ContactForm).filter(ContactForm.email == email).all()