"""Configuration loader and defaults for hbc (HeartBeat Client)."""

import logging
import os

try:
    import yaml
except Exception:
    yaml = None

CLIENT_DEFAULTS = {
    # Network settings
    "hb_port": 50003,          # Port where hbd servers listen
    "interval": 10,             # Heartbeat interval in seconds
    
    # Runtime flags
    "foreground": False,
    "verbose": False,
    "debug": 0,
    
    # Plugin configuration
    "plugins": {},              # Per-plugin configuration
    "thresholds": {},           # Threshold configuration for monitoring
}


def load_config(path=None):
    """Load configuration from a YAML file and merge with client defaults.

    If YAML is not available or the file does not exist, defaults are returned.
    
    Args:
        path: Path to YAML config file (default: ~/.hb.yaml)
        
    Returns:
        Dictionary with configuration
    """
    cfg = CLIENT_DEFAULTS.copy()
    if not path:
        # default path (~/.hb.yaml)
        path = os.path.join(os.path.expanduser("~"), ".hb.yaml")

    if os.path.exists(path):
        if yaml:
            with open(path) as fh:
                data = yaml.safe_load(fh)
            # Merge YAML data with defaults
            # Keep all keys from YAML to support plugin configs and future extensions
            for k, v in data.items():
                cfg[k] = v
        else:
            # yaml not installed: do not attempt to parse; user must ensure defaults
            pass
    return cfg