import os
from typing import Union

from dotenv import load_dotenv

load_dotenv()

DEFAULT_REDMINE_VERIFY = "/etc/ssl/certs/ca-certificates.crt"
FALSE_VALUES = {"0", "false", "no", "off"}
TRUE_VALUES = {"1", "true", "yes", "on"}


class Config:
    @classmethod
    def get_redmine_url(cls) -> str:
        return os.getenv("REDMINE_URL", "").strip().rstrip("/")

    @classmethod
    def get_redmine_api_key(cls) -> str:
        return os.getenv("REDMINE_API_KEY", "").strip()

    @classmethod
    def get_redmine_user(cls) -> str:
        return os.getenv("REDMINE_USER", "").strip()

    @classmethod
    def get_redmine_password(cls) -> str:
        return os.getenv("REDMINE_PASSWORD", "")

    @classmethod
    def get_redmine_verify(cls) -> Union[bool, str]:
        value = os.getenv("REDMINE_VERIFY", "").strip()
        if not value:
            return DEFAULT_REDMINE_VERIFY

        normalized = value.lower()
        if normalized in FALSE_VALUES:
            return False
        if normalized in TRUE_VALUES:
            return True
        return value

    @classmethod
    def get_author(cls, cli_author: str = "") -> str:
        """Возвращает автора: из CLI если задан, иначе из .env, иначе — заглушку."""
        if cli_author:
            return cli_author
        return os.getenv("REDMINE_AUTHOR", "").strip()

    @classmethod
    def get_default_date_range(cls) -> str:
        default_from_date = os.getenv("DEFAULT_FROM_DATE", "").strip()
        default_to_date = os.getenv("DEFAULT_TO_DATE", "").strip()
        if default_from_date and default_to_date:
            return f"{default_from_date}--{default_to_date}"
        # fallback hardcoded
        return "2025-12-19--2026-01-31"

    @classmethod
    def validate(cls) -> None:
        if not cls.get_redmine_url():
            raise ValueError("REDMINE_URL is required (set via env or .env)")
        if cls.get_redmine_api_key():
            return
        if not (cls.get_redmine_user() and cls.get_redmine_password()):
            raise ValueError(
                "REDMINE_API_KEY is required, or set both REDMINE_USER and REDMINE_PASSWORD"
            )