"""Entry point for agent-core bot.

Loads config from environment, optionally reads .env from workspace,
builds and runs the Telegram bot.
"""

import logging
import sys
from pathlib import Path

from core.bot import build_app
from core.config import Config


def _load_dotenv(workspace_dir: Path | None) -> None:
    """Load .env file from workspace directory if it exists."""
    if not workspace_dir:
        return
    env_file = workspace_dir / ".env"
    if not env_file.exists():
        return

    import os
    for line in env_file.read_text().splitlines():
        line = line.strip()
        if not line or line.startswith("#"):
            continue
        if "=" not in line:
            continue
        key, _, value = line.partition("=")
        key = key.strip()
        value = value.strip().strip('"').strip("'")
        # Don't override existing env vars
        if key not in os.environ:
            os.environ[key] = value


def main() -> None:
    logging.basicConfig(
        level=logging.INFO,
        format="%(asctime)s %(name)s %(levelname)s %(message)s",
        datefmt="%Y-%m-%d %H:%M:%S",
    )

    import os
    workspace_dir = os.environ.get("WORKSPACE_DIR")
    if workspace_dir:
        _load_dotenv(Path(workspace_dir))

    try:
        config = Config.from_env()
    except ValueError as e:
        logging.error("Config error: %s", e)
        sys.exit(1)

    if config.workspace_dir:
        logging.info("Workspace: %s", config.workspace_dir)
        # Symlink workspace CLAUDE.md into data dir so Claude CLI finds it
        # when running in topic subdirectories
        claude_md_link = config.data_dir / "CLAUDE.md"
        claude_md_src = config.workspace_dir / "CLAUDE.md"
        if claude_md_src.exists() and not claude_md_link.exists():
            claude_md_link.symlink_to(claude_md_src)
            logging.info("Symlinked CLAUDE.md into data dir")
    logging.info("Data dir: %s", config.data_dir)

    app = build_app(config)
    app.run_polling(
        allowed_updates=["message", "edited_message"],
        stop_signals=None,
    )


if __name__ == "__main__":
    main()