import time
import sys
import os
import argparse
import tkinter as tk
from .core.network import UdpHandler
from .core.dispatcher import MessageDispatcher
from .core.scheduler import TrafficScheduler
from .core.controller import RadarController
from .utils.printer import dump_message
from .gui.main_window import BusMonitorApp

#Configuration
RX_IP = os.getenv("PYBM_RX_IP", "127.0.0.1")
RX_PORT = int(os.getenv("PYBM_RX_PORT", str(61553)))
TARGET_IP = os.getenv("PYBM_TARGET_IP", "127.0.0.1")
TARGET_PORT = int(os.getenv("PYBM_TARGET_PORT", "51553"))


def main_cli():
    """Command-line interface mode (original behavior)"""
    print("--------------------------------------------------")
    print(" PyBusMonitor1553 - Active Controller (CLI Mode)")
    print("--------------------------------------------------")
    
    # 1. Initialize Components
    dispatcher = MessageDispatcher()
    network = UdpHandler(rx_ip=RX_IP, rx_port=RX_PORT)

    # 2. Initialize Radar Logic Controller
    radar_ctrl = RadarController()

    # 3. Initialize Scheduler with the Controller
    scheduler = TrafficScheduler(network, radar_ctrl, TARGET_IP, TARGET_PORT)

    # 4. Define the callback for received messages
    def on_packet(data, addr):
        header, messages = dispatcher.parse_packet(data)
        
        if messages:
            for msg in messages:
                if msg.IS_TRANSMIT:
                    print(f"\n[RX] {msg.__class__.__name__} from RT{header.ta if header else '?'}")
                    dump_message(msg)
        elif header and header.errors != 0:
            print(f"[RX] Server Error Code: {header.errors}")

    # 5. Start everything
    network.register_callback(on_packet)
    network.start()
    scheduler.start()

    print(f"System Running.")
    print(f"RX: {RX_IP}:{RX_PORT} | TX: {TARGET_IP}:{TARGET_PORT}")
    print("Press Ctrl+C to stop.")

    try:
        while True:
            time.sleep(1)
    except KeyboardInterrupt:
        print("\nStopping...")
    finally:
        scheduler.stop()
        network.stop()
        sys.exit(0)


def main_gui():
    """Graphical user interface mode"""
    # Enable quiet mode for scheduler
    from .core import scheduler as sched_module
    sched_module.QUIET_MODE = True
    
    print("--------------------------------------------------")
    print(" PyBusMonitor1553 - Active Controller (GUI Mode)")
    print("--------------------------------------------------")
    
    # Initialize Tkinter
    root = tk.Tk()
    app = BusMonitorApp(root)
    
    # Initialize Components
    dispatcher = MessageDispatcher()
    network = UdpHandler(rx_ip=RX_IP, rx_port=RX_PORT)
    radar_ctrl = RadarController()
    scheduler = TrafficScheduler(network, radar_ctrl, TARGET_IP, TARGET_PORT)
    
    # Counters for status bar
    tx_count = [0]
    rx_count = [0]
    
    # Define the callback for received messages
    def on_packet(data, addr):
        header, messages = dispatcher.parse_packet(data)
        rx_count[0] += 1
        
        if messages:
            for msg in messages:
                if msg.IS_TRANSMIT:
                    msg_name = msg.__class__.__name__
                    # Convert MsgB6 -> B6, MsgA1 -> A1, etc.
                    short_name = msg_name.replace("Msg", "")
                    
                    # Extract raw words if available
                    raw_words = []
                    if hasattr(msg, '_raw_data') and msg._raw_data:
                        import struct
                        data_bytes = msg._raw_data
                        for i in range(0, len(data_bytes), 2):
                            if i + 1 < len(data_bytes):
                                word = struct.unpack('<H', data_bytes[i:i+2])[0]
                                raw_words.append(word)
                    
                    # Update GUI (thread-safe via after())
                    root.after(0, lambda n=short_name, m=msg, r=raw_words: 
                               app.update_message_stats(n, m, r))
        
        # Update status bar
        root.after(0, lambda: app.update_connection_status(
            True, tx_count[0], rx_count[0], ""
        ))
    
    # Wrap scheduler send to count TX
    original_send = network.send
    def counted_send(data, ip, port):
        tx_count[0] += 1
        return original_send(data, ip, port)
    network.send = counted_send
    
    # Wire up menu actions
    def on_connect():
        network.start()
        scheduler.start()
        app.update_connection_status(True, tx_count[0], rx_count[0], "")
    
    def on_disconnect():
        scheduler.stop()
        network.stop()
        app.update_connection_status(False, tx_count[0], rx_count[0], "")
    
    app._on_connect = on_connect
    app._on_disconnect = on_disconnect
    
    # Start networking
    network.register_callback(on_packet)
    network.start()
    scheduler.start()
    
    # Update initial status
    app.update_connection_status(True, 0, 0, "")
    
    print(f"GUI Running.")
    print(f"RX: {RX_IP}:{RX_PORT} | TX: {TARGET_IP}:{TARGET_PORT}")
    
    # Handle window close
    def on_closing():
        scheduler.stop()
        network.stop()
        root.destroy()
    
    root.protocol("WM_DELETE_WINDOW", on_closing)
    
    # Run the GUI main loop
    try:
        root.mainloop()
    except KeyboardInterrupt:
        on_closing()


def main():
    """Main entry point with mode selection"""
    global TARGET_IP, TARGET_PORT
    
    parser = argparse.ArgumentParser(
        description='PyBusMonitor1553 - MIL-STD-1553 Bus Monitor',
        formatter_class=argparse.RawDescriptionHelpFormatter,
        epilog='''
Examples:
  python -m pybusmonitor1553           # Launch GUI mode (default)
  python -m pybusmonitor1553 --cli     # Launch CLI mode
  python -m pybusmonitor1553 --gui     # Launch GUI mode explicitly
        '''
    )
    parser.add_argument('--cli', action='store_true', 
                        help='Run in command-line interface mode')
    parser.add_argument('--gui', action='store_true', 
                        help='Run in graphical user interface mode (default)')
    parser.add_argument('--target', type=str, default=None,
                        help=f'Target IP address (default: {TARGET_IP})')
    parser.add_argument('--port', type=int, default=None,
                        help=f'Target port (default: {TARGET_PORT})')
    
    args = parser.parse_args()
    
    # Update globals if specified
    if args.target:
        TARGET_IP = args.target
    if args.port:
        TARGET_PORT = args.port
    
    if args.cli:
        main_cli()
    else:
        main_gui()
        
if __name__ == "__main__":
    main()