"""Configuration loader and defaults for hbd (HeartBeat Daemon/Server)."""

import logging
import os

try:
    import yaml
except Exception:
    yaml = None

SERVER_DEFAULTS = {
    # Network settings
    "hb_port": 50003,           # Port to listen for heartbeats
    "hbd_port": 50004,          # HTTP API port
    "hbd_host": "",             # Bind address (empty = all interfaces)
    
    # Persistence
    "pickfile": "/tmp/hb.pick",
    
    # Logging
    "logfile": "/var/log/heartbeat.log",
    "logfmt": "text",           # text or msg or json
    
    # Notification settings
    "pushsrv": "pushover",      # pushover, mattermost, or all
    "pushover_token": "",
    "pushover_user": "",
    
    # Monitoring settings
    "interval": 20,             # Expected heartbeat interval (for server checks)
    "grace": 2,                 # Grace multiplier (interval * grace = timeout)
    "threshold_renotify_interval": 3600,  # Seconds between threshold re-notifications
    
    # Host management
    "watchhosts": [],           # Hosts to monitor and notify about
    "dyndnshosts": [],          # Hosts with dynamic DNS
    "drophosts": [],            # Hosts to ignore
    "dyndomains": ["wrede.org"],
    
    # DNS updates
    "nsupdate_bin": "/usr/bin/nsupdate",
    
    # Email settings
    "smtpserver": "smtp.fastmail.com",
    "smtpuser": "andreas@wrede.ca",
    "smtppassword": "pvtvefyp5gbhnch2",
    "smtpport": 587,
    "toemail": ["aew.hbd.notify@wrede.ca"],
    "fromemail": "aew.hbd@wrede.ca",
    
    # WebSocket settings
    "ws_port": 50005,
    "wss_port": None,
    "cert_path": "/usr/local/etc/ssl/",
    "wss_pem": "fullchain.pem",
    "wss_key": "privkey.pem",
    
    # Message journal configuration
    "journal_enabled": True,
    "journal_dir": "/var/log/heartbeat",
    "journal_file": "messages.journal",
    "journal_max_size": 100 * 1024 * 1024,  # 100MB
    "journal_max_backups": 10,
    
    # Runtime flags
    "foreground": False,
    "verbose": False,
    "debug": 0,
    
    # Plugin/threshold configs (for clients reporting to this server)
    "plugins": {},
    "thresholds": {},
}


def load_config(path=None):
    """Load configuration from a YAML file and merge with server 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 = SERVER_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