import threading
import time
import os
import paho.mqtt.client as mqtt
from dotenv import load_dotenv
import state  # يحتوي على `singlas_state`


# ------------------ Load .env ------------------ #
load_dotenv(dotenv_path="keys.env")

mqtt_broker = os.getenv("MQTT_BROKER")
mqtt_port = int(os.getenv("MQTT_PORT"))
MQTT_PARTOPIC_state = os.getenv("MQTT_PARTOPIC_state")
MQTT_SUBTOPIC_reply = os.getenv("MQTT_SUBTOPIC_reply")
MQTT_SUBTOPIC_msg = os.getenv("MQTT_SUBTOPIC_msg")

def topic_msg(tl_id):
    return f"{MQTT_PARTOPIC_state}/{tl_id}/{MQTT_SUBTOPIC_msg}"

def topic_rep(tl_id):
    return f"{MQTT_PARTOPIC_state}/{tl_id}/{MQTT_SUBTOPIC_reply}"
    

# ------------------ Get state ------------------ #
def get_State(tl_id):
    return state.singlas_state.get(tl_id, "FREE")

def checked_ql(ql):
    max_queue_length = 16 # 15 # this is the maximum queue length for the road
    return int(ql)<max_queue_length # for now, always return True, can be improved later to check if the queue length is valid or not
# ------------------ Listener ------------------ #
def mqtt_listener():
    def on_message(client, userdata, message):
        msg = message.payload.decode()
        topic = message.topic
        tl_id = topic.split('/')[1]
        print(f"{state.request}-----{tl_id}")
        print(f"📥 Reply Received on {topic}: {msg}")

        if (msg == 'AVBL'):
            state.request[tl_id]['accepted'] = True
            state.singlas_state[tl_id] = state.request[tl_id]['State']
            next_request = 'DONE QL?' # ask for queue length if to open road in emergency
            client.publish(topic_msg(tl_id), next_request, qos=1)

        if (msg.startswith("QL")):
            ql = msg.split()[1]
            if checked_ql(ql):
              client.publish(topic_msg(tl_id), state.singlas_state[tl_id] +" "+str(state.request[tl_id]['Duration']), qos=1)  

        #if(state.request[tl_id]['State']==state.status_emr):
        #    client.publish(topic_msg(tl_id), state.status_emr +" "+str(state.request[tl_id]['Duration']), qos=1)  

    client = mqtt.Client()
    client.connect(mqtt_broker, mqtt_port)


    # اشترك في كل الردود
    for tl_id in state.singlas_state.keys():
        client.subscribe(topic_rep(tl_id))
        print(f"✅ Subscribed to {topic_rep(tl_id)}")

    
    client.on_message = on_message
    client.loop_forever()

# ------------------ Publisher ------------------ #
def mqtt_publisher_loop(tl_id):
    pub_client = mqtt.Client()
    pub_client.connect(mqtt_broker, mqtt_port)
    pub_client.loop_start()

    last_state = None
    while True:
        current_state = state.singlas_state[tl_id] 

        if current_state != last_state:
            print(f"📡 state {current_state} on {topic_msg(tl_id)} ,state")

            #if current_state != state.status_free:
            topic = topic_msg(tl_id)
            pub_client.publish(topic, current_state,qos=1)
            
            last_state = current_state


        time.sleep(.01)


# ------------------ Startup ------------------ #
def start_mqtt():
    # Start listener once
    threading.Thread(target=mqtt_listener, daemon=True).start()

    # Start one publisher per tl_id
    for tl_id in state.singlas_state.keys():
        threading.Thread(target=mqtt_publisher_loop, args=(tl_id,), daemon=True).start()


'''
from fastapi import WebSocket, WebSocketDisconnect
import asyncio

@app.websocket("/ws/state")
async def websocket_get_state(websocket: WebSocket):
    await websocket.accept()
    try:
        tl_id = await websocket.receive_text()
        print(f"✅ Client subscribed to {tl_id}")

        last_state = None
        while True:
            current_state = get_State(tl_id)
            if current_state != last_state:
                await websocket.send_text(current_state)
                last_state = current_state
            await asyncio.sleep(1)  # كل ثانية يشيك التغيير
    except WebSocketDisconnect:
        print("❌ Client disconnected")

        
@app.get("/test-db")
def test_db():
    try:
        connection = get_db()
        with connection.cursor() as cursor:
            cursor.execute("SELECT 1")
            result = cursor.fetchone()
        connection.close()
        return {"status": "connected", "result": result}
    except Exception as e:
        return {"status": "error", "detail": str(e)}

'''