from typing import List
from definitions.attribute import Attribute

def validate_config(item_attributes: List[Attribute]) -> str:
    """
    Validate the configuration file to ensure all attributes are properly defined.
    Returns "Ok" if everything is valid, otherwise returns an error message.
    """
    # Check for duplicate attribute names
    attrib_names = [attrib.attrib_name for attrib in item_attributes]
    if len(attrib_names) != len(set(attrib_names)):
        return "Duplicate attribute names are not allowed."

    # Validate each attribute
    for attrib in item_attributes:
        error = attrib.validate()
        if error:
            return error

        # Validate comparison (if applicable)
        if attrib.compareto:
            if not isinstance(attrib.compareto, list) or not all(
                isinstance(pair, tuple) and len(pair) == 2 for pair in attrib.compareto
            ):
                return f"Invalid comparison format for attribute '{attrib.attrib_name}'. Expected a list of tuples."
            for cmp, ref_attr in attrib.compareto:
                if cmp not in ["lt", "gt", "le", "ge", "eq"]:
                    return f"Invalid comparison operator '{cmp}' for attribute '{attrib.attrib_name}'."
                if ref_attr not in attrib_names:
                    return f"Invalid reference attribute '{ref_attr}' for comparison in attribute '{attrib.attrib_name}'."

    return "Ok"