config_loader.py

"""
Central config loader. Both fetcher.py and app.py import CONFIG from here.
Resolves paths relative to the project folder so services work regardless of
NSSM's working directory.
"""
import os
import yaml

PROJECT_DIR = os.path.dirname(os.path.abspath(__file__))
CONFIG_PATH = os.path.join(PROJECT_DIR, 'config.yaml')


def load_config():
    if not os.path.exists(CONFIG_PATH):
        raise FileNotFoundError(f"config.yaml not found at {CONFIG_PATH}")
    with open(CONFIG_PATH, 'r', encoding='utf-8') as f:
        cfg = yaml.safe_load(f)

    # Resolve DB path absolutely
    cfg['database']['path'] = os.path.join(PROJECT_DIR, cfg['database']['filename'])

    # Convenience: meter lookup by id
    cfg['meters_by_id'] = {m['id']: m for m in cfg['meters']}

    return cfg


CONFIG = load_config()