"""Configuration module — loads settings from .env file or environment variables."""

import os
from pathlib import Path
from dotenv import load_dotenv

# Load .env from project root
load_dotenv(Path(__file__).parent / ".env")


class Config:
    """Bridge configuration."""

    # Discord
    DISCORD_TOKEN: str = os.getenv("DISCORD_TOKEN", "")
    DISCORD_CHANNEL_ID: int = int(os.getenv("DISCORD_CHANNEL_ID", "0"))

    # Antigravity Brain path
    BRAIN_PATH: Path = Path(os.getenv(
        "BRAIN_PATH",
        os.path.expanduser("~/.gemini/antigravity/brain")
    ))

    # Watcher settings
    DEBOUNCE_SECONDS: float = float(os.getenv("DEBOUNCE_SECONDS", "2"))

    # Files to monitor within each conversation directory
    WATCHED_FILES: set = {
        "task.md",
        "implementation_plan.md",
        "walkthrough.md",
    }

    # Discord message limits
    DISCORD_MSG_LIMIT: int = 2000
    DISCORD_EMBED_DESC_LIMIT: int = 4096

    @classmethod
    def validate(cls) -> list[str]:
        """Return list of configuration errors."""
        errors = []
        if not cls.DISCORD_TOKEN:
            errors.append("DISCORD_TOKEN is not set")
        if not cls.DISCORD_CHANNEL_ID:
            errors.append("DISCORD_CHANNEL_ID is not set")
        if not cls.BRAIN_PATH.exists():
            errors.append(f"BRAIN_PATH does not exist: {cls.BRAIN_PATH}")
        return errors