"""
Gateway subcommand for hermes CLI.

Handles: hermes gateway [run|start|stop|restart|status|install|uninstall|setup]
"""

import asyncio
import os
import signal
import subprocess
import sys
from pathlib import Path

PROJECT_ROOT = Path(__file__).parent.parent.resolve()

from hermes_cli.config import get_env_value, save_env_value
from hermes_cli.setup import (
    print_header, print_info, print_success, print_warning, print_error,
    prompt, prompt_choice, prompt_yes_no,
)
from hermes_cli.colors import Colors, color


# =============================================================================
# Process Management (for manual gateway runs)
# =============================================================================

def find_gateway_pids() -> list:
    """Find PIDs of running gateway processes."""
    pids = []
    patterns = [
        "hermes_cli.main gateway",
        "hermes gateway",
        "gateway/run.py",
    ]

    try:
        if is_windows():
            # Windows: use wmic to search command lines
            result = subprocess.run(
                ["wmic", "process", "get", "ProcessId,CommandLine", "/FORMAT:LIST"],
                capture_output=True, text=True
            )
            # Parse WMIC LIST output: blocks of "CommandLine=...\nProcessId=...\n"
            current_cmd = ""
            for line in result.stdout.split('\n'):
                line = line.strip()
                if line.startswith("CommandLine="):
                    current_cmd = line[len("CommandLine="):]
                elif line.startswith("ProcessId="):
                    pid_str = line[len("ProcessId="):]
                    if any(p in current_cmd for p in patterns):
                        try:
                            pid = int(pid_str)
                            if pid != os.getpid() and pid not in pids:
                                pids.append(pid)
                        except ValueError:
                            pass
                    current_cmd = ""
        else:
            result = subprocess.run(
                ["ps", "aux"],
                capture_output=True,
                text=True
            )
            for line in result.stdout.split('\n'):
                # Skip grep and current process
                if 'grep' in line or str(os.getpid()) in line:
                    continue
                for pattern in patterns:
                    if pattern in line:
                        parts = line.split()
                        if len(parts) > 1:
                            try:
                                pid = int(parts[1])
                                if pid not in pids:
                                    pids.append(pid)
                            except ValueError:
                                continue
                        break
    except Exception:
        pass

    return pids


def kill_gateway_processes(force: bool = False) -> int:
    """Kill any running gateway processes. Returns count killed."""
    pids = find_gateway_pids()
    killed = 0
    
    for pid in pids:
        try:
            if force and not is_windows():
                os.kill(pid, signal.SIGKILL)
            else:
                os.kill(pid, signal.SIGTERM)
            killed += 1
        except ProcessLookupError:
            # Process already gone
            pass
        except PermissionError:
            print(f"⚠ Permission denied to kill PID {pid}")
    
    return killed


def is_linux() -> bool:
    return sys.platform.startswith('linux')

def is_macos() -> bool:
    return sys.platform == 'darwin'

def is_windows() -> bool:
    return sys.platform == 'win32'


# =============================================================================
# Service Configuration
# =============================================================================

SERVICE_NAME = "hermes-gateway"
SERVICE_DESCRIPTION = "Hermes Agent Gateway - Messaging Platform Integration"

def get_systemd_unit_path() -> Path:
    return Path.home() / ".config" / "systemd" / "user" / f"{SERVICE_NAME}.service"

def get_launchd_plist_path() -> Path:
    return Path.home() / "Library" / "LaunchAgents" / "ai.hermes.gateway.plist"

def get_python_path() -> str:
    if is_windows():
        venv_python = PROJECT_ROOT / "venv" / "Scripts" / "python.exe"
    else:
        venv_python = PROJECT_ROOT / "venv" / "bin" / "python"
    if venv_python.exists():
        return str(venv_python)
    return sys.executable

def get_hermes_cli_path() -> str:
    """Get the path to the hermes CLI."""
    # Check if installed via pip
    import shutil
    hermes_bin = shutil.which("hermes")
    if hermes_bin:
        return hermes_bin
    
    # Fallback to direct module execution
    return f"{get_python_path()} -m hermes_cli.main"


# =============================================================================
# Systemd (Linux)
# =============================================================================

def generate_systemd_unit() -> str:
    import shutil
    python_path = get_python_path()
    working_dir = str(PROJECT_ROOT)
    venv_dir = str(PROJECT_ROOT / "venv")
    venv_bin = str(PROJECT_ROOT / "venv" / "bin")
    node_bin = str(PROJECT_ROOT / "node_modules" / ".bin")

    # Build a PATH that includes the venv, node_modules, and standard system dirs
    sane_path = f"{venv_bin}:{node_bin}:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
    
    hermes_cli = shutil.which("hermes") or f"{python_path} -m hermes_cli.main"
    return f"""[Unit]
Description={SERVICE_DESCRIPTION}
After=network.target

[Service]
Type=simple
ExecStart={python_path} -m hermes_cli.main gateway run --replace
ExecStop={hermes_cli} gateway stop
WorkingDirectory={working_dir}
Environment="PATH={sane_path}"
Environment="VIRTUAL_ENV={venv_dir}"
Restart=on-failure
RestartSec=10
KillMode=mixed
KillSignal=SIGTERM
TimeoutStopSec=15
StandardOutput=journal
StandardError=journal

[Install]
WantedBy=default.target
"""

def systemd_install(force: bool = False):
    unit_path = get_systemd_unit_path()
    
    if unit_path.exists() and not force:
        print(f"Service already installed at: {unit_path}")
        print("Use --force to reinstall")
        return
    
    unit_path.parent.mkdir(parents=True, exist_ok=True)
    print(f"Installing systemd service to: {unit_path}")
    unit_path.write_text(generate_systemd_unit())
    
    subprocess.run(["systemctl", "--user", "daemon-reload"], check=True)
    subprocess.run(["systemctl", "--user", "enable", SERVICE_NAME], check=True)
    
    print()
    print("✓ Service installed and enabled!")
    print()
    print("Next steps:")
    print(f"  hermes gateway start              # Start the service")
    print(f"  hermes gateway status             # Check status")
    print(f"  journalctl --user -u {SERVICE_NAME} -f  # View logs")
    print()
    print("To enable lingering (keeps running after logout):")
    print("  sudo loginctl enable-linger $USER")

def systemd_uninstall():
    subprocess.run(["systemctl", "--user", "stop", SERVICE_NAME], check=False)
    subprocess.run(["systemctl", "--user", "disable", SERVICE_NAME], check=False)
    
    unit_path = get_systemd_unit_path()
    if unit_path.exists():
        unit_path.unlink()
        print(f"✓ Removed {unit_path}")
    
    subprocess.run(["systemctl", "--user", "daemon-reload"], check=True)
    print("✓ Service uninstalled")

def systemd_start():
    subprocess.run(["systemctl", "--user", "start", SERVICE_NAME], check=True)
    print("✓ Service started")

def systemd_stop():
    subprocess.run(["systemctl", "--user", "stop", SERVICE_NAME], check=True)
    print("✓ Service stopped")

def systemd_restart():
    subprocess.run(["systemctl", "--user", "restart", SERVICE_NAME], check=True)
    print("✓ Service restarted")

def systemd_status(deep: bool = False):
    # Check if service unit file exists
    unit_path = get_systemd_unit_path()
    if not unit_path.exists():
        print("✗ Gateway service is not installed")
        print("  Run: hermes gateway install")
        return
    
    # Show detailed status first
    subprocess.run(
        ["systemctl", "--user", "status", SERVICE_NAME, "--no-pager"],
        capture_output=False
    )
    
    # Check if service is active
    result = subprocess.run(
        ["systemctl", "--user", "is-active", SERVICE_NAME],
        capture_output=True,
        text=True
    )
    
    status = result.stdout.strip()
    
    if status == "active":
        print("✓ Gateway service is running")
    else:
        print("✗ Gateway service is stopped")
        print("  Run: hermes gateway start")
    
    if deep:
        print()
        print("Recent logs:")
        subprocess.run([
            "journalctl", "--user", "-u", SERVICE_NAME,
            "-n", "20", "--no-pager"
        ])


# =============================================================================
# Launchd (macOS)
# =============================================================================

def generate_launchd_plist() -> str:
    python_path = get_python_path()
    working_dir = str(PROJECT_ROOT)
    log_dir = Path.home() / ".hermes" / "logs"
    log_dir.mkdir(parents=True, exist_ok=True)
    
    return f"""<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>Label</key>
    <string>ai.hermes.gateway</string>
    
    <key>ProgramArguments</key>
    <array>
        <string>{python_path}</string>
        <string>-m</string>
        <string>hermes_cli.main</string>
        <string>gateway</string>
        <string>run</string>
    </array>
    
    <key>WorkingDirectory</key>
    <string>{working_dir}</string>
    
    <key>RunAtLoad</key>
    <true/>
    
    <key>KeepAlive</key>
    <dict>
        <key>SuccessfulExit</key>
        <false/>
    </dict>
    
    <key>StandardOutPath</key>
    <string>{log_dir}/gateway.log</string>
    
    <key>StandardErrorPath</key>
    <string>{log_dir}/gateway.error.log</string>
</dict>
</plist>
"""

def launchd_install(force: bool = False):
    plist_path = get_launchd_plist_path()
    
    if plist_path.exists() and not force:
        print(f"Service already installed at: {plist_path}")
        print("Use --force to reinstall")
        return
    
    plist_path.parent.mkdir(parents=True, exist_ok=True)
    print(f"Installing launchd service to: {plist_path}")
    plist_path.write_text(generate_launchd_plist())
    
    subprocess.run(["launchctl", "load", str(plist_path)], check=True)
    
    print()
    print("✓ Service installed and loaded!")
    print()
    print("Next steps:")
    print("  hermes gateway status             # Check status")
    print("  tail -f ~/.hermes/logs/gateway.log  # View logs")

def launchd_uninstall():
    plist_path = get_launchd_plist_path()
    subprocess.run(["launchctl", "unload", str(plist_path)], check=False)
    
    if plist_path.exists():
        plist_path.unlink()
        print(f"✓ Removed {plist_path}")
    
    print("✓ Service uninstalled")

def launchd_start():
    subprocess.run(["launchctl", "start", "ai.hermes.gateway"], check=True)
    print("✓ Service started")

def launchd_stop():
    subprocess.run(["launchctl", "stop", "ai.hermes.gateway"], check=True)
    print("✓ Service stopped")

def launchd_restart():
    launchd_stop()
    launchd_start()

def launchd_status(deep: bool = False):
    result = subprocess.run(
        ["launchctl", "list", "ai.hermes.gateway"],
        capture_output=True,
        text=True
    )
    
    if result.returncode == 0:
        print("✓ Gateway service is loaded")
        print(result.stdout)
    else:
        print("✗ Gateway service is not loaded")
    
    if deep:
        log_file = Path.home() / ".hermes" / "logs" / "gateway.log"
        if log_file.exists():
            print()
            print("Recent logs:")
            subprocess.run(["tail", "-20", str(log_file)])


# =============================================================================
# Gateway Runner
# =============================================================================

def run_gateway(verbose: bool = False, replace: bool = False):
    """Run the gateway in foreground.
    
    Args:
        verbose: Enable verbose logging output.
        replace: If True, kill any existing gateway instance before starting.
                 This prevents systemd restart loops when the old process
                 hasn't fully exited yet.
    """
    sys.path.insert(0, str(PROJECT_ROOT))
    
    from gateway.run import start_gateway
    
    print("┌─────────────────────────────────────────────────────────┐")
    print("│           ⚕ Hermes Gateway Starting...                 │")
    print("├─────────────────────────────────────────────────────────┤")
    print("│  Messaging platforms + cron scheduler                    │")
    print("│  Press Ctrl+C to stop                                   │")
    print("└─────────────────────────────────────────────────────────┘")
    print()
    
    # Exit with code 1 if gateway fails to connect any platform,
    # so systemd Restart=on-failure will retry on transient errors
    success = asyncio.run(start_gateway(replace=replace))
    if not success:
        sys.exit(1)


# =============================================================================
# Gateway Setup (Interactive Messaging Platform Configuration)
# =============================================================================

# Per-platform config: each entry defines the env vars, setup instructions,
# and prompts needed to configure a messaging platform.
_PLATFORMS = [
    {
        "key": "telegram",
        "label": "Telegram",
        "emoji": "📱",
        "token_var": "TELEGRAM_BOT_TOKEN",
        "setup_instructions": [
            "1. Open Telegram and message @BotFather",
            "2. Send /newbot and follow the prompts to create your bot",
            "3. Copy the bot token BotFather gives you",
            "4. To find your user ID: message @userinfobot — it replies with your numeric ID",
        ],
        "vars": [
            {"name": "TELEGRAM_BOT_TOKEN", "prompt": "Bot token", "password": True,
             "help": "Paste the token from @BotFather (step 3 above)."},
            {"name": "TELEGRAM_ALLOWED_USERS", "prompt": "Allowed user IDs (comma-separated)", "password": False,
             "is_allowlist": True,
             "help": "Paste your user ID from step 4 above."},
            {"name": "TELEGRAM_HOME_CHANNEL", "prompt": "Home channel ID (for cron/notification delivery, or empty to set later with /set-home)", "password": False,
             "help": "For DMs, this is your user ID. You can set it later by typing /set-home in chat."},
        ],
    },
    {
        "key": "discord",
        "label": "Discord",
        "emoji": "💬",
        "token_var": "DISCORD_BOT_TOKEN",
        "setup_instructions": [
            "1. Go to https://discord.com/developers/applications → New Application",
            "2. Go to Bot → Reset Token → copy the bot token",
            "3. Enable: Bot → Privileged Gateway Intents → Message Content Intent",
            "4. Invite the bot to your server:",
            "   OAuth2 → URL Generator → check BOTH scopes:",
            "     - bot",
            "     - applications.commands  (required for slash commands!)",
            "   Bot Permissions: Send Messages, Read Message History, Attach Files",
            "   Copy the URL and open it in your browser to invite.",
            "5. Get your user ID: enable Developer Mode in Discord settings,",
            "   then right-click your name → Copy ID",
        ],
        "vars": [
            {"name": "DISCORD_BOT_TOKEN", "prompt": "Bot token", "password": True,
             "help": "Paste the token from step 2 above."},
            {"name": "DISCORD_ALLOWED_USERS", "prompt": "Allowed user IDs or usernames (comma-separated)", "password": False,
             "is_allowlist": True,
             "help": "Paste your user ID from step 5 above."},
            {"name": "DISCORD_HOME_CHANNEL", "prompt": "Home channel ID (for cron/notification delivery, or empty to set later with /set-home)", "password": False,
             "help": "Right-click a channel → Copy Channel ID (requires Developer Mode)."},
        ],
    },
    {
        "key": "slack",
        "label": "Slack",
        "emoji": "💼",
        "token_var": "SLACK_BOT_TOKEN",
        "setup_instructions": [
            "1. Go to https://api.slack.com/apps → Create New App → From Scratch",
            "2. Enable Socket Mode: Settings → Socket Mode → Enable",
            "   Create an App-Level Token with scope: connections:write → copy xapp-... token",
            "3. Add Bot Token Scopes: Features → OAuth & Permissions → Scopes",
            "   Required: chat:write, app_mentions:read, channels:history, channels:read,",
            "   groups:history, im:history, im:read, im:write, users:read, files:write",
            "4. Subscribe to Events: Features → Event Subscriptions → Enable",
            "   Required events: message.im, message.channels, app_mention",
            "   Optional: message.groups (for private channels)",
            "   ⚠ Without message.channels the bot will ONLY work in DMs!",
            "5. Install to Workspace: Settings → Install App → copy xoxb-... token",
            "6. Reinstall the app after any scope or event changes",
            "7. Find your user ID: click your profile → three dots → Copy member ID",
            "8. Invite the bot to channels: /invite @YourBot",
        ],
        "vars": [
            {"name": "SLACK_BOT_TOKEN", "prompt": "Bot Token (xoxb-...)", "password": True,
             "help": "Paste the bot token from step 3 above."},
            {"name": "SLACK_APP_TOKEN", "prompt": "App Token (xapp-...)", "password": True,
             "help": "Paste the app-level token from step 4 above."},
            {"name": "SLACK_ALLOWED_USERS", "prompt": "Allowed user IDs (comma-separated)", "password": False,
             "is_allowlist": True,
             "help": "Paste your member ID from step 7 above."},
        ],
    },
    {
        "key": "whatsapp",
        "label": "WhatsApp",
        "emoji": "📲",
        "token_var": "WHATSAPP_ENABLED",
    },
    {
        "key": "signal",
        "label": "Signal",
        "emoji": "📡",
        "token_var": "SIGNAL_HTTP_URL",
    },
]


def _platform_status(platform: dict) -> str:
    """Return a plain-text status string for a platform.

    Returns uncolored text so it can safely be embedded in
    simple_term_menu items (ANSI codes break width calculation).
    """
    token_var = platform["token_var"]
    val = get_env_value(token_var)
    if token_var == "WHATSAPP_ENABLED":
        if val and val.lower() == "true":
            session_file = Path.home() / ".hermes" / "whatsapp" / "session" / "creds.json"
            if session_file.exists():
                return "configured + paired"
            return "enabled, not paired"
        return "not configured"
    if platform.get("key") == "signal":
        account = get_env_value("SIGNAL_ACCOUNT")
        if val and account:
            return "configured"
        if val or account:
            return "partially configured"
        return "not configured"
    if val:
        return "configured"
    return "not configured"


def _setup_standard_platform(platform: dict):
    """Interactive setup for Telegram, Discord, or Slack."""
    emoji = platform["emoji"]
    label = platform["label"]
    token_var = platform["token_var"]

    print()
    print(color(f"  ─── {emoji} {label} Setup ───", Colors.CYAN))

    # Show step-by-step setup instructions if this platform has them
    instructions = platform.get("setup_instructions")
    if instructions:
        print()
        for line in instructions:
            print_info(f"  {line}")

    existing_token = get_env_value(token_var)
    if existing_token:
        print()
        print_success(f"{label} is already configured.")
        if not prompt_yes_no(f"  Reconfigure {label}?", False):
            return

    allowed_val_set = None  # Track if user set an allowlist (for home channel offer)

    for var in platform["vars"]:
        print()
        print_info(f"  {var['help']}")
        existing = get_env_value(var["name"])
        if existing and var["name"] != token_var:
            print_info(f"  Current: {existing}")

        # Allowlist fields get special handling for the deny-by-default security model
        if var.get("is_allowlist"):
            print_info(f"  The gateway DENIES all users by default for security.")
            print_info(f"  Enter user IDs to create an allowlist, or leave empty")
            print_info(f"  and you'll be asked about open access next.")
            value = prompt(f"  {var['prompt']}", password=False)
            if value:
                cleaned = value.replace(" ", "")
                save_env_value(var["name"], cleaned)
                print_success(f"  Saved — only these users can interact with the bot.")
                allowed_val_set = cleaned
            else:
                # No allowlist — ask about open access vs DM pairing
                print()
                access_choices = [
                    "Enable open access (anyone can message the bot)",
                    "Use DM pairing (unknown users request access, you approve with 'hermes pairing approve')",
                    "Skip for now (bot will deny all users until configured)",
                ]
                access_idx = prompt_choice("  How should unauthorized users be handled?", access_choices, 1)
                if access_idx == 0:
                    save_env_value("GATEWAY_ALLOW_ALL_USERS", "true")
                    print_warning("  Open access enabled — anyone can use your bot!")
                elif access_idx == 1:
                    print_success("  DM pairing mode — users will receive a code to request access.")
                    print_info("  Approve with: hermes pairing approve {platform} {code}")
                else:
                    print_info("  Skipped — configure later with 'hermes gateway setup'")
            continue

        value = prompt(f"  {var['prompt']}", password=var.get("password", False))
        if value:
            save_env_value(var["name"], value)
            print_success(f"  Saved {var['name']}")
        elif var["name"] == token_var:
            print_warning(f"  Skipped — {label} won't work without this.")
            return
        else:
            print_info(f"  Skipped (can configure later)")

    # If an allowlist was set and home channel wasn't, offer to reuse
    # the first user ID (common for Telegram DMs).
    home_var = f"{label.upper()}_HOME_CHANNEL"
    home_val = get_env_value(home_var)
    if allowed_val_set and not home_val and label == "Telegram":
        first_id = allowed_val_set.split(",")[0].strip()
        if first_id and prompt_yes_no(f"  Use your user ID ({first_id}) as the home channel?", True):
            save_env_value(home_var, first_id)
            print_success(f"  Home channel set to {first_id}")

    print()
    print_success(f"{emoji} {label} configured!")


def _setup_whatsapp():
    """Delegate to the existing WhatsApp setup flow."""
    from hermes_cli.main import cmd_whatsapp
    import argparse
    cmd_whatsapp(argparse.Namespace())


def _is_service_installed() -> bool:
    """Check if the gateway is installed as a system service."""
    if is_linux():
        return get_systemd_unit_path().exists()
    elif is_macos():
        return get_launchd_plist_path().exists()
    return False


def _is_service_running() -> bool:
    """Check if the gateway service is currently running."""
    if is_linux() and get_systemd_unit_path().exists():
        result = subprocess.run(
            ["systemctl", "--user", "is-active", SERVICE_NAME],
            capture_output=True, text=True
        )
        return result.stdout.strip() == "active"
    elif is_macos() and get_launchd_plist_path().exists():
        result = subprocess.run(
            ["launchctl", "list", "ai.hermes.gateway"],
            capture_output=True, text=True
        )
        return result.returncode == 0
    # Check for manual processes
    return len(find_gateway_pids()) > 0


def _setup_signal():
    """Interactive setup for Signal messenger."""
    import shutil

    print()
    print(color("  ─── 📡 Signal Setup ───", Colors.CYAN))

    existing_url = get_env_value("SIGNAL_HTTP_URL")
    existing_account = get_env_value("SIGNAL_ACCOUNT")
    if existing_url and existing_account:
        print()
        print_success("Signal is already configured.")
        if not prompt_yes_no("  Reconfigure Signal?", False):
            return

    # Check if signal-cli is available
    print()
    if shutil.which("signal-cli"):
        print_success("signal-cli found on PATH.")
    else:
        print_warning("signal-cli not found on PATH.")
        print_info("  Signal requires signal-cli running as an HTTP daemon.")
        print_info("  Install options:")
        print_info("    Linux:  sudo apt install signal-cli")
        print_info("            or download from https://github.com/AsamK/signal-cli")
        print_info("    macOS:  brew install signal-cli")
        print_info("    Docker: bbernhard/signal-cli-rest-api")
        print()
        print_info("  After installing, link your account and start the daemon:")
        print_info("    signal-cli link -n \"HermesAgent\"")
        print_info("    signal-cli --account +YOURNUMBER daemon --http 127.0.0.1:8080")
        print()

    # HTTP URL
    print()
    print_info("  Enter the URL where signal-cli HTTP daemon is running.")
    default_url = existing_url or "http://127.0.0.1:8080"
    try:
        url = input(f"  HTTP URL [{default_url}]: ").strip() or default_url
    except (EOFError, KeyboardInterrupt):
        print("\n  Setup cancelled.")
        return

    # Test connectivity
    print_info("  Testing connection...")
    try:
        import httpx
        resp = httpx.get(f"{url.rstrip('/')}/api/v1/check", timeout=10.0)
        if resp.status_code == 200:
            print_success("  signal-cli daemon is reachable!")
        else:
            print_warning(f"  signal-cli responded with status {resp.status_code}.")
            if not prompt_yes_no("  Continue anyway?", False):
                return
    except Exception as e:
        print_warning(f"  Could not reach signal-cli at {url}: {e}")
        if not prompt_yes_no("  Save this URL anyway? (you can start signal-cli later)", True):
            return

    save_env_value("SIGNAL_HTTP_URL", url)

    # Account phone number
    print()
    print_info("  Enter your Signal account phone number in E.164 format.")
    print_info("  Example: +15551234567")
    default_account = existing_account or ""
    try:
        account = input(f"  Account number{f' [{default_account}]' if default_account else ''}: ").strip()
        if not account:
            account = default_account
    except (EOFError, KeyboardInterrupt):
        print("\n  Setup cancelled.")
        return

    if not account:
        print_error("  Account number is required.")
        return

    save_env_value("SIGNAL_ACCOUNT", account)

    # Allowed users
    print()
    print_info("  The gateway DENIES all users by default for security.")
    print_info("  Enter phone numbers or UUIDs of allowed users (comma-separated).")
    existing_allowed = get_env_value("SIGNAL_ALLOWED_USERS") or ""
    default_allowed = existing_allowed or account
    try:
        allowed = input(f"  Allowed users [{default_allowed}]: ").strip() or default_allowed
    except (EOFError, KeyboardInterrupt):
        print("\n  Setup cancelled.")
        return

    save_env_value("SIGNAL_ALLOWED_USERS", allowed)

    # Group messaging
    print()
    if prompt_yes_no("  Enable group messaging? (disabled by default for security)", False):
        print()
        print_info("  Enter group IDs to allow, or * for all groups.")
        existing_groups = get_env_value("SIGNAL_GROUP_ALLOWED_USERS") or ""
        try:
            groups = input(f"  Group IDs [{existing_groups or '*'}]: ").strip() or existing_groups or "*"
        except (EOFError, KeyboardInterrupt):
            print("\n  Setup cancelled.")
            return
        save_env_value("SIGNAL_GROUP_ALLOWED_USERS", groups)

    print()
    print_success("Signal configured!")
    print_info(f"  URL: {url}")
    print_info(f"  Account: {account}")
    print_info(f"  DM auth: via SIGNAL_ALLOWED_USERS + DM pairing")
    print_info(f"  Groups: {'enabled' if get_env_value('SIGNAL_GROUP_ALLOWED_USERS') else 'disabled'}")


def gateway_setup():
    """Interactive setup for messaging platforms + gateway service."""

    print()
    print(color("┌─────────────────────────────────────────────────────────┐", Colors.MAGENTA))
    print(color("│             ⚕ Gateway Setup                            │", Colors.MAGENTA))
    print(color("├─────────────────────────────────────────────────────────┤", Colors.MAGENTA))
    print(color("│  Configure messaging platforms and the gateway service. │", Colors.MAGENTA))
    print(color("│  Press Ctrl+C at any time to exit.                     │", Colors.MAGENTA))
    print(color("└─────────────────────────────────────────────────────────┘", Colors.MAGENTA))

    # ── Gateway service status ──
    print()
    service_installed = _is_service_installed()
    service_running = _is_service_running()

    if service_installed and service_running:
        print_success("Gateway service is installed and running.")
    elif service_installed:
        print_warning("Gateway service is installed but not running.")
        if prompt_yes_no("  Start it now?", True):
            try:
                if is_linux():
                    systemd_start()
                elif is_macos():
                    launchd_start()
            except subprocess.CalledProcessError as e:
                print_error(f"  Failed to start: {e}")
    else:
        print_info("Gateway service is not installed yet.")
        print_info("You'll be offered to install it after configuring platforms.")

    # ── Platform configuration loop ──
    while True:
        print()
        print_header("Messaging Platforms")

        menu_items = []
        for plat in _PLATFORMS:
            status = _platform_status(plat)
            menu_items.append(f"{plat['label']}  ({status})")
        menu_items.append("Done")

        choice = prompt_choice("Select a platform to configure:", menu_items, len(menu_items) - 1)

        if choice == len(_PLATFORMS):
            break

        platform = _PLATFORMS[choice]

        if platform["key"] == "whatsapp":
            _setup_whatsapp()
        elif platform["key"] == "signal":
            _setup_signal()
        else:
            _setup_standard_platform(platform)

    # ── Post-setup: offer to install/restart gateway ──
    any_configured = any(
        bool(get_env_value(p["token_var"]))
        for p in _PLATFORMS
        if p["key"] != "whatsapp"
    ) or (get_env_value("WHATSAPP_ENABLED") or "").lower() == "true"

    if any_configured:
        print()
        print(color("─" * 58, Colors.DIM))
        service_installed = _is_service_installed()
        service_running = _is_service_running()

        if service_running:
            if prompt_yes_no("  Restart the gateway to pick up changes?", True):
                try:
                    if is_linux():
                        systemd_restart()
                    elif is_macos():
                        launchd_restart()
                    else:
                        kill_gateway_processes()
                        print_info("Start manually: hermes gateway")
                except subprocess.CalledProcessError as e:
                    print_error(f"  Restart failed: {e}")
        elif service_installed:
            if prompt_yes_no("  Start the gateway service?", True):
                try:
                    if is_linux():
                        systemd_start()
                    elif is_macos():
                        launchd_start()
                except subprocess.CalledProcessError as e:
                    print_error(f"  Start failed: {e}")
        else:
            print()
            if is_linux() or is_macos():
                platform_name = "systemd" if is_linux() else "launchd"
                if prompt_yes_no(f"  Install the gateway as a {platform_name} service? (runs in background, starts on boot)", True):
                    try:
                        force = False
                        if is_linux():
                            systemd_install(force)
                        else:
                            launchd_install(force)
                        print()
                        if prompt_yes_no("  Start the service now?", True):
                            try:
                                if is_linux():
                                    systemd_start()
                                else:
                                    launchd_start()
                            except subprocess.CalledProcessError as e:
                                print_error(f"  Start failed: {e}")
                    except subprocess.CalledProcessError as e:
                        print_error(f"  Install failed: {e}")
                        print_info("  You can try manually: hermes gateway install")
                else:
                    print_info("  You can install later: hermes gateway install")
                    print_info("  Or run in foreground:  hermes gateway")
            else:
                print_info("  Service install not supported on this platform.")
                print_info("  Run in foreground: hermes gateway")
    else:
        print()
        print_info("No platforms configured. Run 'hermes gateway setup' when ready.")

    print()


# =============================================================================
# Main Command Handler
# =============================================================================

def gateway_command(args):
    """Handle gateway subcommands."""
    subcmd = getattr(args, 'gateway_command', None)
    
    # Default to run if no subcommand
    if subcmd is None or subcmd == "run":
        verbose = getattr(args, 'verbose', False)
        replace = getattr(args, 'replace', False)
        run_gateway(verbose, replace=replace)
        return

    if subcmd == "setup":
        gateway_setup()
        return

    # Service management commands
    if subcmd == "install":
        force = getattr(args, 'force', False)
        if is_linux():
            systemd_install(force)
        elif is_macos():
            launchd_install(force)
        else:
            print("Service installation not supported on this platform.")
            print("Run manually: hermes gateway run")
            sys.exit(1)
    
    elif subcmd == "uninstall":
        if is_linux():
            systemd_uninstall()
        elif is_macos():
            launchd_uninstall()
        else:
            print("Not supported on this platform.")
            sys.exit(1)
    
    elif subcmd == "start":
        if is_linux():
            systemd_start()
        elif is_macos():
            launchd_start()
        else:
            print("Not supported on this platform.")
            sys.exit(1)
    
    elif subcmd == "stop":
        # Try service first, fall back to killing processes directly
        service_available = False
        
        if is_linux() and get_systemd_unit_path().exists():
            try:
                systemd_stop()
                service_available = True
            except subprocess.CalledProcessError:
                pass  # Fall through to process kill
        elif is_macos() and get_launchd_plist_path().exists():
            try:
                launchd_stop()
                service_available = True
            except subprocess.CalledProcessError:
                pass
        
        if not service_available:
            # Kill gateway processes directly
            killed = kill_gateway_processes()
            if killed:
                print(f"✓ Stopped {killed} gateway process(es)")
            else:
                print("✗ No gateway processes found")
    
    elif subcmd == "restart":
        # Try service first, fall back to killing and restarting
        service_available = False
        
        if is_linux() and get_systemd_unit_path().exists():
            try:
                systemd_restart()
                service_available = True
            except subprocess.CalledProcessError:
                pass
        elif is_macos() and get_launchd_plist_path().exists():
            try:
                launchd_restart()
                service_available = True
            except subprocess.CalledProcessError:
                pass
        
        if not service_available:
            # Manual restart: kill existing processes
            killed = kill_gateway_processes()
            if killed:
                print(f"✓ Stopped {killed} gateway process(es)")
            
            import time
            time.sleep(2)
            
            # Start fresh
            print("Starting gateway...")
            run_gateway(verbose=False)
    
    elif subcmd == "status":
        deep = getattr(args, 'deep', False)
        
        # Check for service first
        if is_linux() and get_systemd_unit_path().exists():
            systemd_status(deep)
        elif is_macos() and get_launchd_plist_path().exists():
            launchd_status(deep)
        else:
            # Check for manually running processes
            pids = find_gateway_pids()
            if pids:
                print(f"✓ Gateway is running (PID: {', '.join(map(str, pids))})")
                print("  (Running manually, not as a system service)")
                print()
                print("To install as a service:")
                print("  hermes gateway install")
            else:
                print("✗ Gateway is not running")
                print()
                print("To start:")
                print("  hermes gateway          # Run in foreground")
                print("  hermes gateway install  # Install as service")
