import re
from pathlib import Path

from pydantic import BaseModel


class MasterIocSubs(BaseModel):
    content: str

    @classmethod
    def read_from_file(cls, path: Path) -> "MasterIocSubs":
        with open(path) as f:
            file_content = f.read()

        return MasterIocSubs(content=file_content)

    def update_content(
        self,
        service_name: str,
        starton: str = "0",  # TODO: ok defaults?
        autooff: str = "0",  # TODO: ok defaults?
    ):
        """
        Parses the configuration text and appends a new row before the closing bracket.
        """
        quoted_service = f'"{service_name}"'
        new_row = f'          {{ "{{{{ agebd_env_suffix_upper }}}}",     {quoted_service:<22} , "{starton}",     "{autooff}"     }}'

        # Use regex to find the last closing curly brace of the configuration block
        # This targets the line that contains only a lone closing brace, optional spaces, and maybe a comma/semicolon.
        pattern = r"(\s*\n\s*\}(?:;|,)?\s*$)"

        if re.search(pattern, self.content, re.MULTILINE):
            # Insert our new row right before that closing brace line
            self.content = re.sub(
                pattern, f"\n{new_row}\\1", self.content, count=1, flags=re.MULTILINE
            )
        else:
            raise ValueError(
                "Could not locate the closing structure format '}' inside the configuration."
            )

    def write_to_file(self, path: Path) -> None:
        with open(path, "w") as f:
            f.write(self.content)