# dashboard/callbacks/overview_callbacks.py
import sys
sys.path.append('/workspace')
import threading
import dash
import requests
from dash import Input, Output, State, MATCH, html, dcc
from flask import session
from utils.db import get_session  # Diese Funktion muss eine SQLAlchemy-Session liefern!
from utils.mqtt_client import publish, start_loop
from config import ENV
import dash_bootstrap_components as dbc
import os
import time
import pytz
from datetime import datetime

API_BASE_URL = os.getenv("API_BASE_URL", "http://192.168.43.100")

mqtt_thread_started = False
SCREENSHOT_DIR = "received-screenshots"

def ensure_mqtt_running():
    global mqtt_thread_started
    if not mqtt_thread_started:
        thread = threading.Thread(target=start_loop, daemon=True)
        thread.start()
        mqtt_thread_started = True

def get_latest_screenshot(client_uuid):
    cache_buster = int(time.time())  # aktuelle Unix-Zeit in Sekunden
    # TODO: Hier genau im Produkitv-Modus die IPs testen!
    # Wenn API_BASE_URL auf "http" beginnt, absolute URL verwenden (z.B. im lokalen Dev)
    if API_BASE_URL.startswith("http"):
        return f"{API_BASE_URL}/screenshots/{client_uuid}?t={cache_buster}"
    # Sonst relative URL (nginx-Proxy übernimmt das Routing)
    return f"/screenshots/{client_uuid}?t={cache_buster}"

def fetch_clients():
    try:
        resp = requests.get(f"{API_BASE_URL}/api/clients")
        resp.raise_for_status()
        return resp.json()
    except Exception as e:
        print("Fehler beim Abrufen der Clients:", e)
        return []

@dash.callback(
    Output("clients-cards-container", "children"),
    Input("interval-update", "n_intervals")
)
def update_clients(n):
    # ... Session-Handling wie gehabt ...
    ensure_mqtt_running()
    clients = fetch_clients()
    cards = []
    for client in clients:
        uuid = client["uuid"]
        screenshot = get_latest_screenshot(uuid)
        last_alive_utc = client.get("last_alive")
        if last_alive_utc:
            try:
                # Unterstützt sowohl "2024-06-08T12:34:56Z" als auch "2024-06-08T12:34:56"
                if last_alive_utc.endswith("Z"):
                    dt_utc = datetime.strptime(last_alive_utc, "%Y-%m-%dT%H:%M:%SZ")
                else:
                    dt_utc = datetime.strptime(last_alive_utc, "%Y-%m-%dT%H:%M:%S")
                dt_utc = dt_utc.replace(tzinfo=pytz.UTC)
                # Lokale Zeitzone fest angeben, z.B. Europe/Berlin
                local_tz = pytz.timezone("Europe/Berlin")
                dt_local = dt_utc.astimezone(local_tz)
                last_alive_str = dt_local.strftime("%d.%m.%Y %H:%M:%S")
            except Exception:
                last_alive_str = last_alive_utc
        else:
            last_alive_str = "-"
        
        card = dbc.Card(
            [
                dbc.CardHeader(client["location"]),
                dbc.CardBody([
                    html.Img(
                        src=screenshot,
                        style={
                            "width": "240px",
                            "height": "135px",
                            "object-fit": "cover",
                            "display": "block",
                            "margin-left": "auto",
                            "margin-right": "auto"
                        },
                    ),
                    html.P(f"IP: {client['ip_address'] or '-'}", className="card-text"),
                    html.P(f"Letzte Aktivität: {last_alive_str}", className="card-text"),
                    dbc.ButtonGroup([
                        dbc.Button("Reload Page", color="primary", id={"type": "btn-reload", "index": uuid}, n_clicks=0),
                        dbc.Button("Restart Client", color="danger", id={"type": "btn-restart", "index": uuid}, n_clicks=0),
                    ], className="mt-2"),
                    html.Div(id={"type": "restart-feedback", "index": uuid}),
                    html.Div(id={"type": "reload-feedback", "index": uuid}),
                ]),
            ],
            className="mb-4",
            style={"width": "18rem"},
        )
        cards.append(dbc.Col(card, width=4))
    return dbc.Row(cards)

@dash.callback(
    Output({"type": "restart-feedback", "index": MATCH}, "children"),
    Input({"type": "btn-restart", "index": MATCH}, "n_clicks"),
    State({"type": "btn-restart", "index": MATCH}, "id")
)
def on_restart(n_clicks, btn_id):
    if n_clicks and n_clicks > 0:
        cid = btn_id["index"]
        payload = '{"command": "restart"}'
        ok = publish(f"clients/{cid}/control", payload)
        return "Befehl gesendet." if ok else "Fehler beim Senden."
    return ""

@dash.callback(
    Output({"type": "reload-feedback", "index": MATCH}, "children"),
    Input({"type": "btn-reload", "index": MATCH}, "n_clicks"),
    State({"type": "btn-reload", "index": MATCH}, "id")
)
def on_reload(n_clicks, btn_id):
    if n_clicks and n_clicks > 0:
        cid = btn_id["index"]
        payload = '{"command": "reload"}'
        ok = publish(f"clients/{cid}/control", payload)
        return "Befehl gesendet." if ok else "Fehler beim Senden."
    return ""