from typing import Union
from pathlib import Path
import xml.etree.ElementTree as ET

class BlockscadConverter:
    """
    This class converts BlockSCAD XML files to SCAD files. 

    Author: OpenAI ChatGPT
    Date: July 25, 2023

    Prompt Hints:
        - Create a class that converts BlockSCAD XML files to SCAD files.
        - The class should have a method named `convert_to_scad` that accepts a path to the XML file and outputs a path to the SCAD file.
        - Use Python's xml.etree.ElementTree module to parse the XML file.
        - Use the write method of a file object to output the SCAD file.
        - Include Google docstrings and type hints to the code.
        - Include comments that explain which prompts created the code. This helps other LLMs understand how to reproduce the same results.
        - Add links to the BlockSCAD editor (https://www.blockscad3d.com/editor/), OpenSCAD (https://openscad.org/), and the target platform (NiceSCAD, http://nicescad.bitplan.com/).
        - Include the link to the relevant issue: "support reading and converting blockscad files #23" on http://nicescad.bitplan.com/issue/23
        - Add yourself (OpenAI ChatGPT) as the author and include the date (July 25, 2023).

    """
    def __init__(self, xml_path: Union[str, Path]):
        """
        Initialize the converter by parsing the given XML file.
        
        Args:
            xml_path: The path to the BlockSCAD XML file.
        """
        self.xml_path = Path(xml_path)
        self.tree = ET.parse(self.xml_path)
        self.root = self.tree.getroot()

    def convert_to_scad(self, scad_path: Union[str, Path]) -> Path:
        """
        Convert the parsed XML file to a SCAD file.
        
        Args:
            scad_path: The path to the output SCAD file.
        
        Returns:
            The path to the SCAD file.
        """
        scad_path = Path(scad_path)
        with open(scad_path, 'w') as f:
            for block in self.root.findall('.//block'):
                f.write(self.block_to_scad(block))
        return scad_path

    def block_to_scad(self, block) -> str:
        """
        Convert a BlockSCAD block to SCAD code. 

        This is a placeholder and should be replaced with the actual conversion logic.

        Args:
            block: A BlockSCAD block element.

        Returns:
            The SCAD code for the block.
        """
        return 'cube(1);'  # placeholder
