from time import time, gmtime, mktime,sleep
import network, machine, ntptime, sockets, json, requests

def time_from_iso(datetime_str):
    [yyyy, mm, dd] = [int(i) for i in datetime_str.split('T')[0].split('-')]
    [h,m,s] = [int(i) for i in datetime_str.split('T')[1].split(':')]
    time_u = mktime((yyyy, mm, dd, h, m, s, 0, 0))
    return time_u

def start_ap():
    # Sets up initial captive portal for configuring wifi and basic options
    ap = network.WLAN(network.AP_IF)
    ap.active(true)

    ap.config(
        essid="CTA-Setup",
        authmode=network.AUTH_OPEN
    )

    print("AP active for initial setup: ", ap.active())
    print("AP IP address:", ap.ifconfig()[0])

    return ap

def parse_form_data(body):
    """Parse URL-encoded form data"""
    data = {}
    pairs = body.split("&")
    for pair in pairs:
        if "=" in pair:
            key, value = pair.split("=", 1)
            # URL decode
            data[key] = value.replace("+", " ").replace("%40", "@")
    return data

def save_config(data):
    """Save Wi-Fi credentials to config.json"""
    if not data.get("SSID"):
        raise ValueError("SSID is required")
    
    config = {
        "SSID": data.get("SSID"),
        "PASS": data.get("PASS", ""),
        "APIKEY": data.get("APIKEY", "")
    }
    
    with open("config.json", "w") as f:
        json.dump(config, f)
    
    print("Configuration saved:", config)

def start_http_server():
    addr = socket.getaddrinfo("0.0.0.0", 80)[0][-1]
    s = socket.socket()
    s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    s.bind(addr)
    s.listen(1)

    print("HTTP server listening on port 80")

    while True:
        try:
            conn, addr = s.accept()
            request = conn.recv(2048).decode()

            if request.startswith("POST /save"):
                # Handle form submission
                body = request.split("\r\n\r\n", 1)[1]
                form_data = parse_form_data(body)
                save_config(form_data)

                response_body = """<!DOCTYPE html>
<html>
<head>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Setup Complete</title>
    <style>
        body { font-family: sans-serif; padding: 16px; text-align: center; }
        h2 { color: #28a745; }
    </style>
</head>
<body>
    <h2>Configuration saved</h2>
    <p>Device will reboot and connect to Wi-Fi.</p>
    <p><small>You can close this window.</small></p>
</body>
</html>"""
            else:
                # Serve the setup page for any other request
                # Build list of stations
                html_list = ''
                for station, dict in stations.items(): # loop through all stations
                    html_list += f'<option value={station}>{stations[station]["name"]}</option>'

                response_body = """<!DOCTYPE html>
<html>
<head>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Device Setup</title>
    <style>
        body {
            font-family: sans-serif;
            padding: 16px;
            max-width: 400px;
            margin: 0 auto;
        }
        h2 {
            margin-top: 0;
        }
        label {
            display: block;
            margin-top: 12px;
            font-weight: bold;
        }
        input, button {
            width: 100%;
            padding: 10px;
            margin-top: 6px;
            font-size: 16px;
            box-sizing: border-box;
        }
        button {
            margin-top: 20px;
            background: #007bff;
            color: white;
            border: none;
            cursor: pointer;
        }
        button:hover {
            background: #0056b3;
        }
    </style>
</head>
<body>
    <h2>Device Setup</h2>

    <form method="POST" action="/save">
        <label>
            Wi-Fi SSID
            <input name="SSID" required>
        </label>

        <label>
            Password
            <input name="PASS" type="password">
        </label>

        <label>
            CTA API Key
            <input name="APIKEY">
        </label>

        <label>
            Left LED Station: 
            <select name="Station">
                {}
            </select>
        </label>

        <button type="submit">Save & Connect</button>
    </form>
</body>
</html>""".format(html_list)


            response = (
                "HTTP/1.1 200 OK\r\n"
                "Content-Type: text/html\r\n"
                "Connection: close\r\n\r\n"
                + response_body
            )

            conn.send(response.encode())

        except Exception as e:
            print("HTTP error:", e)
            try:
                error = f"<h2>Error</h2><p>{e}</p>"
                conn.send(
                    "HTTP/1.1 500 Internal Server Error\r\n"
                    "Content-Type: text/html\r\n"
                    "Connection: close\r\n\r\n"
                    .encode() + error.encode()
                )
            except:
                pass
        finally:
            try:
                conn.close()
            except:
                pass

def reconnect_wifi():
    while not wlan.isconnected():
        try:
            wlan.connect(SSID, PASS)
            max_wait = 10
            while max_wait > 0:
                if wlan.isconnected():
                    break
                max_wait -= 1
                print('Waiting for connection...')
                sleep(1)
            if wlan.isconnected():
                print('Connected to Wi-Fi')
                print('Network config:', wlan.ifconfig())
                break
        except Exception as e:
            print('Connection error:', e)
        print('Retrying connection...')
        sleep(2)

def init_LEDs():
    # Sets up LEDs and their ports.
    led = machine.Pin(15, machine.Pin.OUT)
    led.off()

# Synchronize time of RTC with NTP
last_ntp_sync = -3700 # Init as more than an hour ago
last_api_query = mktime([2000,1,1,0,0,0,0,0]) # Set last query default (will run on first run)
query_period = 120 # Query the API at most every 2 minutes
distance_on = 10 # Time from station before turning on LED

# Stations dictionary contains name, the ETA of all trains as an array, the LED index of the light and the LED state
stations = {}
stations[41090] = { 'name':' Monroe (Red Line)', 'eta':[], 'led_index':1, 'state':0 }
stations[40820] = { 'name':' Rosemont (Blue Line)', 'eta':[], 'led_index': machine.Pin(15, machine.Pin.OUT), 'state':0 }
stations[41010] = { 'name':' Rockwell (Brown Line)', 'eta':[], 'led_index':3, 'state':0 }
stations[40470] = { 'name':' Racine (Blue Line)', 'eta':[], 'led_index':4, 'state':0 }
stations[40190] = { 'name':' Sox-35th (Red Line)', 'eta':[], 'led_index':5, 'state':0 }
stations[40020] = { 'name':' Harlem/Lake (Green Line)', 'eta':[], 'led_index':6, 'state':0 }
stations[40900] = { 'name':' Howard (Red Purple & Yellow lines)', 'eta':[], 'led_index':7, 'state':0 }
stations[41160] = { 'name':' Clinton (Green & Pink lines)', 'eta':[], 'led_index':8, 'state':0 }
stations[40230] = { 'name':' Cumberland (Blue Line)', 'eta':[], 'led_index':9, 'state':0 }
stations[40560] = { 'name':' Jackson (Red Line)', 'eta':[], 'led_index':10, 'state':0 }
stations[41150] = { 'name':' Kedzie (Orange Line)', 'eta':[], 'led_index':11, 'state':0 }
stations[40780] = { 'name':' Central Park (Pink Line)', 'eta':[], 'led_index':12, 'state':0 }
stations[41080] = { 'name':' 47th (Green Line)', 'eta':[], 'led_index':13, 'state':0 }
stations[40510] = { 'name':' Garfield (Green Line)', 'eta':[], 'led_index':14, 'state':0 }
stations[41050] = { 'name':' Linden (Purple Line)', 'eta':[], 'led_index':2, 'state':0 }
stations[40120] = { 'name':' 35th/Archer (Orange Line)', 'eta':[], 'led_index':16, 'state':0 }
stations[40570] = { 'name':' California (Blue Line)', 'eta':[], 'led_index':17, 'state':0 }
stations[40260] = { 'name':' State/Lake (Brown Green Orange Pink & Purple lines)', 'eta':[], 'led_index':18, 'state':0 }
stations[40130] = { 'name':' 51st (Green Line)', 'eta':[], 'led_index':19, 'state':0 }
stations[41700] = { 'name':' Washington/Wabash (Brown Green Orange Purple & Pink lines)', 'eta':[], 'led_index':20, 'state':0 }
stations[41000] = { 'name':' Cermak-Chinatown (Red Line)', 'eta':[], 'led_index':21, 'state':0 }
stations[40340] = { 'name':' Berwyn (Red Line)', 'eta':[], 'led_index':22, 'state':0 }
stations[41690] = { 'name':' Cermak-McCormick Place (Green Line)', 'eta':[], 'led_index':23, 'state':0 }
stations[40490] = { 'name':' Grand (Blue Line)', 'eta':[], 'led_index':24, 'state':0 }
stations[41060] = { 'name':' Ashland (Orange Line)', 'eta':[], 'led_index':25, 'state':0 }
stations[40090] = { 'name':' Damen (Brown Line)', 'eta':[], 'led_index':26, 'state':0 }
stations[41280] = { 'name':' Jefferson Park (Blue Line)', 'eta':[], 'led_index':27, 'state':0 }
stations[40520] = { 'name':' Foster (Purple Line)', 'eta':[], 'led_index':28, 'state':0 }
stations[40330] = { 'name':' Grand (Red Line)', 'eta':[], 'led_index':29, 'state':0 }
stations[40280] = { 'name':' Central (Green Line)', 'eta':[], 'led_index':30, 'state':0 }
stations[40250] = { 'name':' Kedzie-Homan (Blue Line)', 'eta':[], 'led_index':31, 'state':0 }
stations[40870] = { 'name':' Francisco (Brown Line)', 'eta':[], 'led_index':32, 'state':0 }
stations[41240] = { 'name':' Addison (Blue Line)', 'eta':[], 'led_index':33, 'state':0 }
stations[40740] = { 'name':' Western (Pink Line)', 'eta':[], 'led_index':34, 'state':0 }
stations[41360] = { 'name':' California (Green Line)', 'eta':[], 'led_index':35, 'state':0 }
stations[41400] = { 'name':' Roosevelt (Red Orange & Green lines)', 'eta':[], 'led_index':36, 'state':0 }
stations[41410] = { 'name':' Chicago (Blue Line)', 'eta':[], 'led_index':37, 'state':0 }
stations[40680] = { 'name':' Adams/Wabash (Brown Green Orange Pink & Purple lines)', 'eta':[], 'led_index':38, 'state':0 }
stations[40920] = { 'name':' Pulaski (Blue Line)', 'eta':[], 'led_index':39, 'state':0 }
stations[41210] = { 'name':' Wellington (Brown & Purple lines)', 'eta':[], 'led_index':40, 'state':0 }
stations[41340] = { 'name':' LaSalle (Blue Line)', 'eta':[], 'led_index':41, 'state':0 }
stations[41490] = { 'name':' Harrison (Red Line)', 'eta':[], 'led_index':42, 'state':0 }
stations[41350] = { 'name':' Oak Park (Green Line)', 'eta':[], 'led_index':43, 'state':0 }
stations[40040] = { 'name':' Quincy/Wells (Brown Orange Purple & Pink lines)', 'eta':[], 'led_index':44, 'state':0 }
stations[40390] = { 'name':' Forest Park (Blue Line)', 'eta':[], 'led_index':45, 'state':0 }
stations[41130] = { 'name':' Halsted (Orange Line)', 'eta':[], 'led_index':46, 'state':0 }
stations[40960] = { 'name':' Pulaski (Orange Line)', 'eta':[], 'led_index':47, 'state':0 }
stations[40830] = { 'name':' 18th (Pink Line)', 'eta':[], 'led_index':48, 'state':0 }
stations[40140] = { 'name':' Dempster-Skokie  (Yellow Line)', 'eta':[], 'led_index':49, 'state':0 }
stations[41320] = { 'name':' Belmont (Red Brown & Purple lines)', 'eta':[], 'led_index':50, 'state':0 }
stations[41660] = { 'name':' Lake (Red Line)', 'eta':[], 'led_index':51, 'state':0 }
stations[40910] = { 'name':' 63rd (Red Line)', 'eta':[], 'led_index':52, 'state':0 }
stations[40690] = { 'name':' Dempster (Purple Line)', 'eta':[], 'led_index':53, 'state':0 }
stations[40460] = { 'name':' Merchandise Mart (Brown & Purple lines)', 'eta':[], 'led_index':54, 'state':0 }
stations[40710] = { 'name':' Chicago (Brown & Purple lines)', 'eta':[], 'led_index':55, 'state':0 }
stations[40530] = { 'name':' Diversey (Brown & Purple lines)', 'eta':[], 'led_index':56, 'state':0 }
stations[40850] = { 'name':' Harold Washington Library-State/Van Buren (Brown Orange Purple & Pink lines)', 'eta':[], 'led_index':57, 'state':0 }
stations[41020] = { 'name':' Logan Square (Blue Line)', 'eta':[], 'led_index':58, 'state':0 }
stations[41030] = { 'name':' Polk (Pink Line)', 'eta':[], 'led_index':59, 'state':0 }
stations[41300] = { 'name':' Loyola (Red Line)', 'eta':[], 'led_index':60, 'state':0 }
stations[40310] = { 'name':' Western (Orange Line)', 'eta':[], 'led_index':61, 'state':0 }
stations[40430] = { 'name':' Clinton (Blue Line)', 'eta':[], 'led_index':62, 'state':0 }
stations[40320] = { 'name':' Division (Blue Line)', 'eta':[], 'led_index':63, 'state':0 }
stations[41510] = { 'name':' Morgan (Green & Pink lines)', 'eta':[], 'led_index':64, 'state':0 }
stations[40270] = { 'name':' Main (Purple Line)', 'eta':[], 'led_index':65, 'state':0 }
stations[41330] = { 'name':' Montrose (Blue Line)', 'eta':[], 'led_index':66, 'state':0 }
stations[40350] = { 'name':' UIC-Halsted (Blue Line)', 'eta':[], 'led_index':67, 'state':0 }
stations[40940] = { 'name':' Halsted (Green Line)', 'eta':[], 'led_index':68, 'state':0 }
stations[41480] = { 'name':' Western (Brown Line)', 'eta':[], 'led_index':69, 'state':0 }
stations[40030] = { 'name':' Pulaski (Green Line)', 'eta':[], 'led_index':70, 'state':0 }
stations[41190] = { 'name':' Jarvis (Red Line)', 'eta':[], 'led_index':71, 'state':0 }
stations[41170] = { 'name':' Garfield (Red Line)', 'eta':[], 'led_index':72, 'state':0 }
stations[40050] = { 'name':' Davis (Purple Line)', 'eta':[], 'led_index':73, 'state':0 }
stations[40750] = { 'name':' Harlem (Blue Line - OHare Branch)', 'eta':[], 'led_index':74, 'state':0 }
stations[41200] = { 'name':' Argyle (Red Line)', 'eta':[], 'led_index':75, 'state':0 }
stations[40440] = { 'name':' California (Pink Line)', 'eta':[], 'led_index':76, 'state':0 }
stations[40360] = { 'name':' Southport (Brown Line)', 'eta':[], 'led_index':77, 'state':0 }
stations[40760] = { 'name':' Granville (Red Line)', 'eta':[], 'led_index':78, 'state':0 }
stations[40480] = { 'name':' Cicero (Green Line)', 'eta':[], 'led_index':79, 'state':0 }
stations[40730] = { 'name':' Washington/Wells (Brown Orange Purple & Pink lines)', 'eta':[], 'led_index':80, 'state':0 }
stations[40580] = { 'name':' 54th/Cermak (Pink Line)', 'eta':[], 'led_index':81, 'state':0 }
stations[40650] = { 'name':' North/Clybourn (Red Line)', 'eta':[], 'led_index':82, 'state':0 }
stations[40220] = { 'name':' Western (Blue Line - Forest Park Branch)', 'eta':[], 'led_index':83, 'state':0 }
stations[40070] = { 'name':' Jackson (Blue Line)', 'eta':[], 'led_index':84, 'state':0 }
stations[41440] = { 'name':' Addison (Brown Line)', 'eta':[], 'led_index':85, 'state':0 }
stations[41670] = { 'name':' Conservatory (Green Line)', 'eta':[], 'led_index':86, 'state':0 }
stations[40790] = { 'name':' Monroe (Blue Line)', 'eta':[], 'led_index':87, 'state':0 }
stations[40180] = { 'name':' Oak Park (Blue Line)', 'eta':[], 'led_index':88, 'state':0 }
stations[40400] = { 'name':' Noyes (Purple Line)', 'eta':[], 'led_index':89, 'state':0 }
stations[41260] = { 'name':' Austin (Green Line)', 'eta':[], 'led_index':90, 'state':0 }
stations[40600] = { 'name':' Kostner (Pink Line)', 'eta':[], 'led_index':91, 'state':0 }
stations[40670] = { 'name':' Western (Blue Line - OHare Branch)', 'eta':[], 'led_index':92, 'state':0 }
stations[40100] = { 'name':' Morse (Red Line)', 'eta':[], 'led_index':93, 'state':0 }
stations[40770] = { 'name':' Lawrence (Red Line)', 'eta':[], 'led_index':94, 'state':0 }
stations[40150] = { 'name':' Pulaski (Pink Line)', 'eta':[], 'led_index':95, 'state':0 }
stations[40660] = { 'name':' Armitage (Brown & Purple lines)', 'eta':[], 'led_index':96, 'state':0 }
stations[40540] = { 'name':' Wilson (Red & Purple lines)', 'eta':[], 'led_index':97, 'state':0 }
stations[40380] = { 'name':' Clark/Lake (Blue Brown Green Orange Purple & Pink lines)', 'eta':[], 'led_index':98, 'state':0 }
stations[40160] = { 'name':' LaSalle/Van Buren (Brown Orange Purple & Pink lines)', 'eta':[], 'led_index':99, 'state':0 }
stations[40700] = { 'name':' Laramie (Green Line)', 'eta':[], 'led_index':100, 'state':0 }
stations[40240] = { 'name':' 79th (Red Line)', 'eta':[], 'led_index':101, 'state':0 }
stations[40290] = { 'name':' Ashland/63rd (Green Line)', 'eta':[], 'led_index':102, 'state':0 }
stations[40450] = { 'name':' 95th/Dan Ryan (Red Line)', 'eta':[], 'led_index':103, 'state':0 }
stations[40210] = { 'name':' Damen (Pink Line)', 'eta':[], 'led_index':104, 'state':0 }
stations[41140] = { 'name':' King Drive (Green Line)', 'eta':[], 'led_index':105, 'state':0 }
stations[41710] = { 'name':' Damen (Green Line)', 'eta':[], 'led_index':106, 'state':0 }
stations[40980] = { 'name':' Harlem (Blue Line - Forest Park Branch)', 'eta':[], 'led_index':107, 'state':0 }
stations[41270] = { 'name':' 43rd (Green Line)', 'eta':[], 'led_index':108, 'state':0 }
stations[40080] = { 'name':' Sheridan (Red Line)', 'eta':[], 'led_index':109, 'state':0 }
stations[40610] = { 'name':' Ridgeland (Green Line)', 'eta':[], 'led_index':110, 'state':0 }
stations[41070] = { 'name':' Kedzie (Green Line)', 'eta':[], 'led_index':111, 'state':0 }
stations[41430] = { 'name':' 87th (Red Line)', 'eta':[], 'led_index':112, 'state':0 }
stations[41250] = { 'name':' Central (Purple Line)', 'eta':[], 'led_index':113, 'state':0 }
stations[40880] = { 'name':' Thorndale (Red Line)', 'eta':[], 'led_index':114, 'state':0 }
stations[41680] = { 'name':' Oakton-Skokie (Yellow Line)', 'eta':[], 'led_index':115, 'state':0 }
stations[41120] = { 'name':' 35th-Bronzeville-IIT (Green Line)', 'eta':[], 'led_index':116, 'state':0 }
stations[41460] = { 'name':' Irving Park (Brown Line)', 'eta':[], 'led_index':117, 'state':0 }
stations[41220] = { 'name':' Fullerton (Red Brown & Purple lines)', 'eta':[], 'led_index':118, 'state':0 }
stations[40990] = { 'name':' 69th (Red Line)', 'eta':[], 'led_index':119, 'state':0 }
stations[41040] = { 'name':' Kedzie (Pink Line)', 'eta':[], 'led_index':120, 'state':0 }
stations[40800] = { 'name':' Sedgwick (Brown & Purple lines)', 'eta':[], 'led_index':121, 'state':0 }
stations[40060] = { 'name':' Belmont (Blue Line)', 'eta':[], 'led_index':122, 'state':0 }
stations[40840] = { 'name':' South Boulevard (Purple Line)', 'eta':[], 'led_index':123, 'state':0 }
stations[40170] = { 'name':' Ashland (Green & Pink lines)', 'eta':[], 'led_index':124, 'state':0 }
stations[40810] = { 'name':' Illinois Medical District (Blue Line)', 'eta':[], 'led_index':125, 'state':0 }
stations[41230] = { 'name':' 47th (Red Line)', 'eta':[], 'led_index':126, 'state':0 }
stations[41500] = { 'name':' Montrose (Brown Line)', 'eta':[], 'led_index':127, 'state':0 }
stations[40930] = { 'name':' Midway (Orange Line)', 'eta':[], 'led_index':128, 'state':0 }
stations[40550] = { 'name':' Irving Park (Blue Line)', 'eta':[], 'led_index':129, 'state':0 }
stations[40370] = { 'name':' Washington (Blue Line)', 'eta':[], 'led_index':130, 'state':0 }
stations[40890] = { 'name':' OHare (Blue Line)', 'eta':[], 'led_index':131, 'state':0 }
stations[40630] = { 'name':' Clark/Division (Red Line)', 'eta':[], 'led_index':132, 'state':0 }
stations[41420] = { 'name':' Addison (Red Line)', 'eta':[], 'led_index':133, 'state':0 }
stations[41290] = { 'name':' Kimball (Brown Line)', 'eta':[], 'led_index':134, 'state':0 }
stations[40300] = { 'name':' Indiana (Green Line)', 'eta':[], 'led_index':135, 'state':0 }
stations[40420] = { 'name':' Cicero (Pink Line)', 'eta':[], 'led_index':136, 'state':0 }
stations[40720] = { 'name':' Cottage Grove (Green Line)', 'eta':[], 'led_index':137, 'state':0 }
stations[41380] = { 'name':' Bryn Mawr (Red Line)', 'eta':[], 'led_index':138, 'state':0 }
stations[41450] = { 'name':' Chicago (Red Line)', 'eta':[], 'led_index':139, 'state':0 }
stations[40590] = { 'name':' Damen (Blue Line)', 'eta':[], 'led_index':140, 'state':0 }
stations[41180] = { 'name':' Kedzie (Brown Line)', 'eta':[], 'led_index':141, 'state':0 }
stations[40010] = { 'name':' Austin (Blue Line)', 'eta':[], 'led_index':142, 'state':0 }
stations[41310] = { 'name':' Paulina (Brown Line)', 'eta':[], 'led_index':143, 'state':0 }
stations[40970] = { 'name':' Cicero (Blue Line)', 'eta':[], 'led_index':144, 'state':0 }

# Check if already configured and load config for Wifi, API Key etc.
try:
    with open("config.json", "r") as f:
        config = json.load(f)
    APIKEY = config.APIKEY
    SSID = config.SSID
    PASS = config.PASS
    wlan = network.WLAN(network.STA_IF)
    wlan.active(True)
    reconnect_wifi()
    start_http_server()   # Still launch server to allow changing SSID and config
    demo = False
except:
    # Failed to open file, launch AP mode
    start_ap()
    start_http_server()

    # Halt waiting for config
    while(True):
        sleep(5)


# Function sets up all LEDs.
init_LEDs()


while(True):
    # Synchronise NTP time if hasn't been done in 1 hour
    if (time() - last_ntp_sync) > 3600:
        reconnect_wifi()
        try:
            ntptime.settime()
            print("Time synchronized successfully")
            last_ntp_sync = time()
        except Exception as e:
            print("Error synchronizing time:", e)
            
    # Have we queried API in the query_period seconds?
    if (time() - last_api_query) > query_period:
        # Query updated API
        trains = (requests.get("https://lapi.transitchicago.com/api/1.0/ttpositions.aspx?key="+APIKEY+"&rt=Blue&outputType=JSON")).json()['ctatt']
        
        # Timestamps are served in local Chicago time, convert to GMT for simplicity on this side.
        print(f"Time of poll is: "+str(gmtime(time_from_iso(trains['tmst'])+(5*60*60))))
        
        # Loop through all trains and update matching stations
        for train in trains['route'][0]['train']:
            nextStation = int(train['nextStaId'])
            eta_time = time_from_iso(train['arrT'])+(5*60*60)
            
            # Append the ETA, we rely on the station loop to remove old trains
            stations[nextStation]['eta'].append(eta_time)
        
        
        last_api_query = time() # uptime polling window
        
    
    # Process the ETA for each station 
    for station, dict in stations.items(): # loop through all stations
        if station == 40820: # Our test station for onboard LED
            
            # Set LED state tracker to 0, if no trains, it'll stay 0.
            stations[station]['state'] = 0
            for index, eta in enumerate(dict['eta']):   # multiple trains. Enumerate is used so we have the index to update the dict itself.
                time_from_now = eta - time()

                print('Train will arrive at'+dict['name']+' in '+ str(time_from_now) + ' seconds')
                if time_from_now < distance_on: 
                    stations[station]['state'] = 1
            
                if time_from_now < -distance_on: # Remove old trains
                    stations[station]['eta'].pop(index)
            
            # Set Station LED state
            stations[station]['led_index'].value(stations[station]['state'])          

    sleep(1)