import os
from dataclasses import dataclass, field


@dataclass
class Config:
    telegram_bot_token: str = os.getenv("TELEGRAM_BOT_TOKEN", "")
    telegram_chat_id: int = int(os.getenv("TELEGRAM_CHAT_ID", "0"))
    instagram_username: str = os.getenv("INSTAGRAM_USERNAME", "")
    instagram_password: str = os.getenv("INSTAGRAM_PASSWORD", "")
    check_interval_minutes: int = int(os.getenv("CHECK_INTERVAL_MINUTES", "15"))
    download_dir: str = os.getenv("DOWNLOAD_DIR", "/data/downloads")
    session_file: str = os.getenv("SESSION_FILE", "/data/session")
    max_media_size_mb: int = int(os.getenv("MAX_MEDIA_SIZE_MB", "50"))
    max_post_age_hours: int = int(os.getenv("MAX_POST_AGE_HOURS", "24"))
    concurrent_checks: int = int(os.getenv("CONCURRENT_CHECKS", "5"))

    def validate(self) -> list[str]:
        errors = []
        if not self.telegram_bot_token:
            errors.append("TELEGRAM_BOT_TOKEN is required")
        if not self.telegram_chat_id:
            errors.append("TELEGRAM_CHAT_ID is required")
        if not self.instagram_username:
            errors.append("INSTAGRAM_USERNAME is required")
        if not self.instagram_password:
            errors.append("INSTAGRAM_PASSWORD is required")
        return errors


config = Config()