import requests
import random
import os
import importlib
from datetime import datetime
from src.config import config
import src.data.operators as operators_module
import src.data.emojis as emojis

_operators_mtime = None
dbf = config.get("dbf", "https://dbf.finalrewind.org")

def _reload_operators_if_changed():
    global _operators_mtime

    path = operators_module.__file__
    current_mtime = os.path.getmtime(path)

    if _operators_mtime is None:
        _operators_mtime = current_mtime
        return
    
    if current_mtime != _operators_mtime:
        importlib.reload(operators_module)
        _operators_mtime = current_mtime
        logger("operators.py wurde automatisch neu geladen (Änderungen erkannt)")

def random_connection():
    available_stations = config["stations"].copy()
    while True:
        if not available_stations:
            logger("Keine validen Bahnhöfe. Schlag den richtigen Bahnhofsnamen auf {dbf} nach", "fatal")
       
        station = random.choice(available_stations)
        url = f"{dbf}/{station}.json"
        blacklist = config.get("blacklist", [])

        try:
            response = requests.get(url)
            response.raise_for_status()
            data = response.json()
        except requests.RequestException as e:
            logger(f"Fehler beim aussuchen der Verbindung: {e}", "fatal")
            return
        
        if response.status_code == 300:
            logger(f"Bahnhof '{station}' konnte nicht gefunden werden ({url})", "error")
            available_stations.remove(station)
            continue

        departures = [
            d for d in data.get("departures", [])
            if d.get("scheduledDeparture") and d.get("destination") != station
            and not d.get("train", "").startswith(tuple(blacklist))
        ]

        if not departures:
            continue

        if not config['random']:
            dep = departures[0]
        else:
            dep = random.choice(departures)

        return {
            "train": dep['train'], 
            "destination": dep['destination'], 
            "route": dep['route'], 
            "departure": dep['scheduledDeparture'], 
            "via": dep['via'], 
            "station": station,
            "train_number": dep['trainNumber']
        }

def get_train_info(station, train_ID, train_type):
    url = f"{dbf}/z/{train_type}%20{train_ID}/{station}.json"
    logger(f"Fetche {url}")
    try:
        response = requests.get(url)
        response.raise_for_status()
        data = response.json()
    except requests.RequestException as e:
        logger(f"ReqestException Fehler: {e}")
        return None

    dep = data.get("departure", [])
    if not dep:
        logger("Kein departure Feld gefunden", "error")
        return None
    
    route_post = dep.get("route_post_diff")
    if not route_post:
        logger("Kein route_post_diff Feld gefunden", "error")
        return None
    
    arrival_iso = route_post[-1].get("sched_arr")
    if not arrival_iso:
        logger("Keine Ankunftszeit gefunden", "error")
        return None
    
    return {
        "arrival": arrival_iso,
        "operators": dep.get("operators"),
    }

def format_via_list(via: list[str]):
    if not via:
        return ""
    if len(via) == 1:
        return via[0]
    return ", ".join(via[:-1]) + " und " + via[-1] 

def resolve_operator(operators):
    if not operators:
        return None
    for op in operators:
        if op in operators_module.OPERATOR_ALIASES or op in operators_module.OPERATORS:
            return op
        
    return operators[0]

def operator_metadata(operator):
    _reload_operators_if_changed()

    if not operator:
        return operators_module.OPERATORS["fallback"]

    if operator in operators_module.OPERATOR_ALIASES:
        return operators_module.OPERATOR_ALIASES[operator]

    return operators_module.OPERATORS.get(operator, operators_module.OPERATORS["fallback"])

def get_channel_formatting(train_type):
    formatting = config.get("formatting", "")
    train_emoji = ""

    if config.get("emojis", True):
        train_emoji = emojis.train_types.get(train_type)
        if train_emoji is None:
            train_emoji = emojis.emoji_list.get("Fallback", "")
    
    return f"{train_emoji}{formatting}"

def logger(msg, log_type="info"):
    status = log_type.upper()
    current_time = datetime.now().strftime('%X')
    print(f"{current_time}: {status}: {msg}")
    if status == "FATAL":
        os._exit(1)