"""
Core client initialization and environment loading.
"""
import os
import sys
from dotenv import load_dotenv
from atproto import Client

def load_credentials():
    """Loads credentials from .env in the project root, explicitly overriding the system environment variables."""
    # Look for .env in the current working directory, or walk up
    env_path = os.path.join(os.getcwd(), '.env')
    if os.path.exists(env_path):
        load_dotenv(env_path, override=True)
    else:
        # Fallback to home/void/.env if working somewhere else
        home_env = os.path.expanduser('~/void/.env')
        if os.path.exists(home_env):
            load_dotenv(home_env, override=True)

    username = os.getenv("BSKY_USERNAME")
    password = os.getenv("BSKY_PASSWORD")
    pds_uri = os.getenv("PDS_URI", "https://bsky.social")

    if not username or not password:
        print("Error: BSKY_USERNAME and BSKY_PASSWORD environment variables must be set.", file=sys.stderr)
        sys.exit(1)

    return username, password, pds_uri

def get_client() -> Client:
    """Returns an authenticated atproto Client."""
    username, password, pds_uri = load_credentials()
    client = Client(base_url=pds_uri)
    client.login(username, password)
    return client