"""Command line interface for hbd package."""

import argparse
import getpass
import sys

from .config import load_config
from .main import run as run_server

PUSHSRVS = ["all", "pushover", "mattermost"]


def build_parser():
    parser = argparse.ArgumentParser(
        prog="hbd",
        description="HeartBeatDaemon - Wait for heartbeat messages and act on them (or their absence)",
        formatter_class=argparse.RawDescriptionHelpFormatter,
    )

    subparsers = parser.add_subparsers(dest="command")

    # --- serve (default) ---
    serve_p = subparsers.add_parser("serve", help="Start the hbd server (default)")
    serve_p.add_argument("-c", "--config", dest="configfile", help="Config file path (YAML)")
    serve_p.add_argument("-f", "--foreground", action="store_true", help="Run in foreground")
    serve_p.add_argument("-v", "--verbose", action="store_true", help="Verbose output")
    serve_p.add_argument("-p", "--pushsrv", dest="pushsrv", choices=PUSHSRVS,
                         help="Push service to use")
    serve_p.add_argument("-x", "--debug", action="count", default=0, help="Increase debug level")

    # Legacy top-level flags (no subcommand) — kept for backward compatibility
    parser.add_argument("-c", "--config", dest="configfile", help="Config file path (YAML)")
    parser.add_argument("-f", "--foreground", action="store_true", help="Run in foreground")
    parser.add_argument("-v", "--verbose", action="store_true", help="Verbose output")
    parser.add_argument("-p", "--pushsrv", dest="pushsrv", choices=PUSHSRVS,
                        help="Push service to use")
    parser.add_argument("-x", "--debug", action="count", default=0, help="Increase debug level")

    # --- passwd ---
    passwd_p = subparsers.add_parser(
        "passwd",
        help="Generate a password hash for use in the config file",
    )
    passwd_p.add_argument(
        "username",
        nargs="?",
        help="Username (informational only, for display)",
    )

    return parser


def cmd_passwd(args):
    """Interactive password hash generator."""
    from .users import hash_password

    username = args.username or ""
    prompt = f"New password for {username}: " if username else "New password: "
    while True:
        pw = getpass.getpass(prompt)
        if not pw:
            print("Password must not be empty.", file=sys.stderr)
            continue
        pw2 = getpass.getpass("Confirm password: ")
        if pw != pw2:
            print("Passwords do not match, try again.", file=sys.stderr)
            continue
        break

    hashed = hash_password(pw)
    if username:
        print(f"\nAdd the following to your config under users: -> {username}:")
    else:
        print("\nPassword hash (paste into config file under the user's 'password' key):")
    print(f"  password: {hashed}")


def main(argv=None):
    parser = build_parser()
    args = parser.parse_args(argv)

    if args.command == "passwd":
        cmd_passwd(args)
        return

    # Default: run the server (supports both `hbd serve ...` and `hbd ...`)
    config = load_config(args.configfile)

    # Apply CLI overrides
    if args.foreground:
        config["foreground"] = True
    if args.verbose:
        config["verbose"] = True
    if args.pushsrv:
        config["pushsrv"] = args.pushsrv
    if args.debug > 0:
        config["debug"] = args.debug

    # Pass config_path for reloading support
    run_server(config, config_path=args.configfile)


if __name__ == "__main__":
    main()