from datetime import datetime
from flask_socketio import SocketIO, join_room, leave_room, emit
from chat.manager import add_user_to_room, remove_user_from_room, get_room_members

# SocketIO instance — imported and attached to app in app.py
socketio = SocketIO(cors_allowed_origins="*")

# Optional: store recent messages per room in memory
message_history = {}


# ---------------------------------------------------------------------------
# connect
# ---------------------------------------------------------------------------
@socketio.on('connect')
def on_connect():
    from flask import request
    print(f"[+] Client connected: {request.sid}")


# ---------------------------------------------------------------------------
# join_room
# ---------------------------------------------------------------------------
@socketio.on('join_room')
def on_join(data):
    from flask import request
    room = data.get('room')
    if not room:
        emit('error', {'message': 'Room name is required'})
        return

    sid = request.sid
    join_room(room)                         # Flask-SocketIO room join
    add_user_to_room(room, sid)             # Track in our manager

    members = len(get_room_members(room))
    print(f"[+] {sid} joined room '{room}' ({members} members)")

    # Send recent history to the joining client
    history = message_history.get(room, [])
    emit('room_joined', {
        'room': room,
        'message': f"You joined room '{room}'",
        'history': history[-20:]             # Last 20 messages
    })

    # Notify others in the room
    emit('user_joined', {
        'message': f"A new user joined '{room}'",
        'members': members
    }, to=room, include_self=False)


# ---------------------------------------------------------------------------
# send_message
# ---------------------------------------------------------------------------
@socketio.on('send_message')
def on_message(data):
    from flask import request
    room = data.get('room')
    message = data.get('message', '').strip()

    if not room or not message:
        emit('error', {'message': 'Room and message are required'})
        return

    payload = {
        'message': message,
        'timestamp': datetime.now().strftime('%Y-%m-%d %H:%M:%S'),
        'sender': request.sid[:8]           # Short anonymous sender ID
    }

    # Store in history
    if room not in message_history:
        message_history[room] = []
    message_history[room].append(payload)

    # Broadcast to everyone in the room (including sender)
    emit('receive_message', payload, to=room)
    print(f"[MSG] room='{room}' | {payload['sender']}: {message}")


# ---------------------------------------------------------------------------
# disconnect
# ---------------------------------------------------------------------------
@socketio.on('disconnect')
def on_disconnect():
    from flask import request
    sid = request.sid
    remove_user_from_room(sid)
    print(f"[-] Client disconnected: {sid}")