#!/usr/bin/env python3
"""
Hermes Gateway - Standalone messaging platform integration.

This is the proper entry point for running the gateway as a service.
NOT tied to the CLI - runs independently.

Usage:
    # Run in foreground (for testing)
    ./scripts/hermes-gateway
    
    # Install as systemd service
    ./scripts/hermes-gateway install
    
    # Manage the service
    ./scripts/hermes-gateway start
    ./scripts/hermes-gateway stop
    ./scripts/hermes-gateway restart
    ./scripts/hermes-gateway status
    
    # Uninstall
    ./scripts/hermes-gateway uninstall
"""

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

# Add parent directory to path
SCRIPT_DIR = Path(__file__).parent.resolve()
PROJECT_DIR = SCRIPT_DIR.parent
sys.path.insert(0, str(PROJECT_DIR))

# Load .env file
from dotenv import load_dotenv
env_path = PROJECT_DIR / '.env'
if env_path.exists():
    load_dotenv(dotenv_path=env_path)


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

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

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

def get_launchd_plist_path() -> Path:
    """Get the path for the launchd plist file (macOS)."""
    return Path.home() / "Library" / "LaunchAgents" / f"ai.hermes.gateway.plist"

def get_python_path() -> str:
    """Get the path to the Python interpreter."""
    # Prefer the venv if it exists
    venv_python = PROJECT_DIR / "venv" / "bin" / "python"
    if venv_python.exists():
        return str(venv_python)
    return sys.executable

def get_gateway_script_path() -> str:
    """Get the path to this script."""
    return str(Path(__file__).resolve())


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

def generate_systemd_unit() -> str:
    """Generate the systemd unit file content."""
    python_path = get_python_path()
    script_path = get_gateway_script_path()
    working_dir = str(PROJECT_DIR)
    
    return f"""[Unit]
Description={SERVICE_DESCRIPTION}
After=network.target

[Service]
Type=simple
ExecStart={python_path} {script_path} run
WorkingDirectory={working_dir}
Restart=on-failure
RestartSec=10
StandardOutput=journal
StandardError=journal

# Environment (optional - can also use .env file)
# Environment="TELEGRAM_BOT_TOKEN=your_token"
# Environment="DISCORD_BOT_TOKEN=your_token"

[Install]
WantedBy=default.target
"""

def install_systemd():
    """Install the systemd user service."""
    unit_path = get_systemd_unit_path()
    unit_path.parent.mkdir(parents=True, exist_ok=True)
    
    print(f"Installing systemd service to: {unit_path}")
    unit_path.write_text(generate_systemd_unit())
    
    # Reload systemd
    subprocess.run(["systemctl", "--user", "daemon-reload"], check=True)
    
    # Enable the service (start on boot)
    subprocess.run(["systemctl", "--user", "enable", SERVICE_NAME], check=True)
    
    print(f"✓ Service installed and enabled")
    print(f"")
    print(f"To start the service:")
    print(f"  systemctl --user start {SERVICE_NAME}")
    print(f"")
    print(f"To view logs:")
    print(f"  journalctl --user -u {SERVICE_NAME} -f")
    print(f"")
    print(f"To enable lingering (keeps service running after logout):")
    print(f"  sudo loginctl enable-linger $USER")

def uninstall_systemd():
    """Uninstall the systemd user service."""
    unit_path = get_systemd_unit_path()
    
    # Stop and disable first
    subprocess.run(["systemctl", "--user", "stop", SERVICE_NAME], check=False)
    subprocess.run(["systemctl", "--user", "disable", SERVICE_NAME], check=False)
    
    # Remove the unit file
    if unit_path.exists():
        unit_path.unlink()
        print(f"✓ Removed {unit_path}")
    
    # Reload systemd
    subprocess.run(["systemctl", "--user", "daemon-reload"], check=True)
    print(f"✓ Service uninstalled")

def systemd_status():
    """Show systemd service status."""
    subprocess.run(["systemctl", "--user", "status", SERVICE_NAME])

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

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

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


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

def generate_launchd_plist() -> str:
    """Generate the launchd plist file content."""
    python_path = get_python_path()
    script_path = get_gateway_script_path()
    working_dir = str(PROJECT_DIR)
    log_dir = Path.home() / ".hermes" / "logs"
    
    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>{script_path}</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>
    
    <key>EnvironmentVariables</key>
    <dict>
        <key>PATH</key>
        <string>/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin</string>
    </dict>
</dict>
</plist>
"""

def install_launchd():
    """Install the launchd service (macOS)."""
    plist_path = get_launchd_plist_path()
    plist_path.parent.mkdir(parents=True, exist_ok=True)
    
    # Ensure log directory exists
    log_dir = Path.home() / ".hermes" / "logs"
    log_dir.mkdir(parents=True, exist_ok=True)
    
    print(f"Installing launchd service to: {plist_path}")
    plist_path.write_text(generate_launchd_plist())
    
    # Load the service
    subprocess.run(["launchctl", "load", str(plist_path)], check=True)
    
    print(f"✓ Service installed and loaded")
    print(f"")
    print(f"To view logs:")
    print(f"  tail -f ~/.hermes/logs/gateway.log")
    print(f"")
    print(f"To manage the service:")
    print(f"  launchctl start ai.hermes.gateway")
    print(f"  launchctl stop ai.hermes.gateway")

def uninstall_launchd():
    """Uninstall the launchd service (macOS)."""
    plist_path = get_launchd_plist_path()
    
    # Unload first
    subprocess.run(["launchctl", "unload", str(plist_path)], check=False)
    
    # Remove the plist file
    if plist_path.exists():
        plist_path.unlink()
        print(f"✓ Removed {plist_path}")
    
    print(f"✓ Service uninstalled")

def launchd_status():
    """Show launchd service status."""
    subprocess.run(["launchctl", "list", "ai.hermes.gateway"])

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

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

def launchd_restart():
    """Restart the launchd service."""
    launchd_stop()
    launchd_start()


# =============================================================================
# Platform Detection
# =============================================================================

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'


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

def run_gateway():
    """Run the gateway in foreground."""
    from gateway.run import start_gateway
    print("Starting Hermes Gateway...")
    print("Press Ctrl+C to stop.")
    print()
    asyncio.run(start_gateway())


# =============================================================================
# Main CLI
# =============================================================================

def main():
    parser = argparse.ArgumentParser(
        description="Hermes Gateway - Messaging Platform Integration",
        formatter_class=argparse.RawDescriptionHelpFormatter,
        epilog="""
Examples:
    # Run in foreground (for testing)
    ./scripts/hermes-gateway run
    
    # Install as system service
    ./scripts/hermes-gateway install
    
    # Manage the service
    ./scripts/hermes-gateway start
    ./scripts/hermes-gateway stop
    ./scripts/hermes-gateway restart
    ./scripts/hermes-gateway status
    
    # Uninstall
    ./scripts/hermes-gateway uninstall

Configuration:
    Set environment variables in .env file or system environment:
    - TELEGRAM_BOT_TOKEN
    - DISCORD_BOT_TOKEN
    - WHATSAPP_ENABLED
    
    Or create ~/.hermes/gateway.json for advanced configuration.
"""
    )
    
    parser.add_argument(
        "command",
        choices=["run", "install", "uninstall", "start", "stop", "restart", "status"],
        nargs="?",
        default="run",
        help="Command to execute (default: run)"
    )
    
    parser.add_argument(
        "--verbose", "-v",
        action="store_true",
        help="Verbose output"
    )
    
    args = parser.parse_args()
    
    # Detect platform and dispatch command
    if args.command == "run":
        run_gateway()
    
    elif args.command == "install":
        if is_linux():
            install_systemd()
        elif is_macos():
            install_launchd()
        else:
            print("Service installation not supported on this platform.")
            print("Please run manually: ./scripts/hermes-gateway run")
            sys.exit(1)
    
    elif args.command == "uninstall":
        if is_linux():
            uninstall_systemd()
        elif is_macos():
            uninstall_launchd()
        else:
            print("Service uninstallation not supported on this platform.")
            sys.exit(1)
    
    elif args.command == "start":
        if is_linux():
            systemd_start()
        elif is_macos():
            launchd_start()
        else:
            print("Not supported on this platform.")
            sys.exit(1)
    
    elif args.command == "stop":
        if is_linux():
            systemd_stop()
        elif is_macos():
            launchd_stop()
        else:
            print("Not supported on this platform.")
            sys.exit(1)
    
    elif args.command == "restart":
        if is_linux():
            systemd_restart()
        elif is_macos():
            launchd_restart()
        else:
            print("Not supported on this platform.")
            sys.exit(1)
    
    elif args.command == "status":
        if is_linux():
            systemd_status()
        elif is_macos():
            launchd_status()
        else:
            print("Not supported on this platform.")
            sys.exit(1)


if __name__ == "__main__":
    main()