import os
from dataclasses import dataclass


HEADERS = {"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) Unraid-Sync/1.0"}


@dataclass
class Config:
    ics_url: str
    baikal_url: str
    baikal_user: str
    baikal_pass: str
    sync_frequency: int


def validate() -> Config:
    errors = []

    ics_url = os.environ.get("ICS_URL")
    if not ics_url:
        errors.append("ICS_URL is required")

    baikal_url = os.environ.get("BAIKAL_URL")
    if not baikal_url:
        errors.append("BAIKAL_URL is required")

    baikal_user = os.environ.get("BAIKAL_USER")
    if not baikal_user:
        errors.append("BAIKAL_USER is required")

    baikal_pass = os.environ.get("BAIKAL_PASS")
    if not baikal_pass:
        errors.append("BAIKAL_PASS is required")

    sync_freq_raw = os.environ.get("SYNC_FREQUENCY", "5")
    try:
        sync_frequency = int(sync_freq_raw)
        if sync_frequency <= 0:
            raise ValueError
    except ValueError:
        errors.append("SYNC_FREQUENCY must be a positive integer")

    if errors:
        raise ValueError("\n".join(errors))

    return Config(
        ics_url=ics_url,
        baikal_url=baikal_url,
        baikal_user=baikal_user,
        baikal_pass=baikal_pass,
        sync_frequency=sync_frequency,
    )