from typing import Dict, Union, Optional
from epc_data.attributes.attribute_utils import extract_thermal_transmittance, extract_component_types


class FloorAttributes:
    DWELLING_BELOW = ["another dwelling below", "other premises below"]
    FLOOR_TYPES = ["assumed", "to unheated space", "to external air", "suspended", "solid"]

    def __init__(self, description: str):
        self.description: str = description.lower()

        if not description or not any(
            rt in self.description for rt in self.FLOOR_TYPES + self.DWELLING_BELOW + ["average thermal transmittance"]
        ):
            raise ValueError('Invalid description')

    def process(self) -> Dict[str, Union[str, bool, int, None]]:
        result: Dict[str, Union[float, str, bool, None]] = {}
        description = self.description

        # thermal transmittance
        result, description = extract_thermal_transmittance(result, description)

        # floor type
        result, description = extract_component_types(result, description, list_of_components=self.FLOOR_TYPES)

        thickness_map = {
            "external insulation": "average",
            "internal insulation": "average",
            "limited insulation": "below average",
            "partial insulation": "below average",
            "no insulation": "none",
            "additional insulation": "above average",
            "insulated": "average"
        }
        for key, value in thickness_map.items():
            if key in description:
                result['insulation_thickness'] = value
                break
        else:
            result['insulation_thickness'] = None

        return result