import json
import os
from pathlib import Path


class Config:
    __env_prefix = "OHM"

    def __init__(self):
        if os.path.isfile("config/config.json"):
            with open("config/config.json") as file:
                self.config = json.load(file)
        else:
            self.config = {}

        self.p_data = Path(self.get_config_value("content_path", "/var/www/content"))

        self.p_data_toc = self.p_data / "toc"

        self.p_data_contents = self.p_data / "contents"
        self.p_data_questions = self.p_data_contents / "questions"
        self.p_data_html = self.p_data_contents / "html"
        self.p_data_photos = self.p_data_contents / "photos"
        self.p_data_pictures = self.p_data_contents / "drawings"
        self.p_data_sections = self.p_data_contents / "sections"
        self.p_data_slides = self.p_data_contents / "slides"
        self.p_data_snippets = self.p_data_contents / "snippets"
        self.p_data_static = self.p_data_contents / "static"
        self.p_data_solutions = self.p_data_contents / "solutions"

        self.p_data_fragenkatalog = self.p_data_questions / "fragenkatalog3b.json"
        self.p_data_metadata = self.p_data_questions / "metadata3b.json"

        self.p_build = Path("./build")
        self.p_build_photos = self.p_build / "photos"
        self.p_build_pictures = self.p_build / "pictures"
        self.p_build_assets = self.p_build / "assets"

        self.p_assets = Path("./assets")

    def get_config_value(self, key: str, default=None):
        if key in self.config:
            return self.config[key]
        elif f"{self.__env_prefix}_{key.upper()}" in os.environ.keys():
            return os.environ[f"{self.__env_prefix}_{key.upper()}"]
        elif default is not None:
            return default
        else:
            raise Exception(
                f"ERROR: Required value for '{key}' not found."
                f"Add to config.json or env as '${self.__env_prefix}_{key.upper()}'"
            )