import json
import os
from typing import Dict, List, Optional
from app.services import notifications

ROOT = os.path.dirname(os.path.dirname(__file__))  # backend/app
DATA_DIR = os.path.join(ROOT, "data")

ROUTES: List[Dict] = []
NOTIFS: List[Dict] = []
COLONIAS: List[Dict] = []
ESTADO: Dict[str, int] = {}
STATUS: Dict[str, str] = {}
LAST_EVENTS: List[Dict] = []


def _load_json(filename: str):
    path = os.path.join(DATA_DIR, filename)
    with open(path, "r", encoding="utf-8") as f:
        return json.load(f)


def load_data():
    global ROUTES, NOTIFS, COLONIAS
    ROUTES = _load_json("rutas.json")
    NOTIFS = _load_json("notificaciones.json")
    COLONIAS = _load_json("colonias-rutas.json")


def start_simulation_state():
    """Inicializa el estado (positionId) para cada ruta presente en `rutas.json`."""
    global ESTADO, STATUS
    ESTADO = {}
    STATUS = {}
    for r in ROUTES:
        rid = r.get("routeId")
        ESTADO[rid] = 1
        STATUS[rid] = r.get("status", "PENDIENTE")


def get_colonias():
    return COLONIAS


def get_route_position(routeId: str) -> Optional[int]:
    return ESTADO.get(routeId)


def get_route_status(routeId: str) -> Optional[str]:
    return STATUS.get(routeId)


def _find_notif(event_name: str) -> Optional[Dict]:
    for n in NOTIFS:
        if n.get("triggerEvent") == event_name:
            return n
    return None


def tick() -> List[Dict]:
    """Avanza todas las rutas en memoria (pos 1..8) y devuelve eventos disparados."""
    global ESTADO, LAST_EVENTS
    events = []
    for route_id, pos in list(ESTADO.items()):
        if pos < 8:
            antes = pos
            ahora = pos + 1
            ESTADO[route_id] = ahora
            evt = None
            if antes == 1 and ahora == 2:
                evt = "ROUTE_START"
            elif ahora == 4:
                evt = "TRUCK_PROXIMITY"
            elif ahora == 8:
                evt = "ROUTE_COMPLETED"

            if evt:
                notif = _find_notif(evt)
                payload = notif.get("pushPayload") if notif else {"title": evt, "body": ""}
                simulated = {"routeId": route_id, "event": evt, "payload": payload}
                events.append(simulated)
                LAST_EVENTS.append(simulated)
                # Enviar push vía servicio de notificaciones (FCM) o mock
                topic = f"topic_{route_id}"
                try:
                    notifications.send_to_topic(topic, payload)
                except Exception:
                    print(f"[SIM PUSH FAIL] {route_id} -> {evt}: {payload.get('title')} - {payload.get('body')}")

    return events


def get_last_events() -> List[Dict]:
    return LAST_EVENTS[-20:]