from configparser import ConfigParser, SectionProxy
from functools import cached_property

from .options import Options
from .resource import Resource


class Installer:
    """
    manages the installation of preferences files
    """

    def __init__(self):
        self.options = Options.from_cli_args()

    @cached_property
    def config(self) -> ConfigParser:
        path = self.options.config_path
        with open(path, "r", encoding="utf-8") as config_file:
            parser = ConfigParser()
            # make keys case-sensitive
            parser.optionxform = str
            parser.read_file(config_file)
            return parser

    def run(self):
        for name in self.config.sections():
            section = self.config[name]
            if self.when(section):
                r = Resource.from_section(name, section)
                print(f"RUN  [{name}]")
                r.run()
            else:
                print(f"SKIP [{name}]")

    def when(self, section: SectionProxy) -> bool:
        if clause := section.get("when", None):
            from .host import host

            given_locals = {
                "host": host,
            }

            v = eval(clause, None, given_locals)
            return bool(v)
        return True