import network
import urequests as requests
import ujson as json
import time
from machine import Pin, SPI, I2C
from mfrc522 import MFRC522
from ssd1306 import SSD1306_I2C

# Global variables
DOOR_ID = 1
WLAN_SSID = '[Your SSID]'
WLAN_PASS = '[Your password]'
SERVER_IP = '[Your server IP]'
SERVER_PORT = 5000

# Initialize RFID reader
reader = MFRC522(spi_id=0, sck=6, miso=4, mosi=7, cs=5, rst=22)

# Initialize I2C for the OLED display
i2c = I2C(id=0, scl=Pin(1), sda=Pin(0), freq=200000)
oled = None

# Initialize greenLED
greenled = Pin(16, Pin.OUT)
greenled.on()
time.sleep(0.5)
greenled.off()
# Initialize redLED
redled = Pin(21, Pin.OUT)
redled.on()
time.sleep(0.5)
redled.off()

def init_oled():
    global oled
    try:
        oled = SSD1306_I2C(128, 64, i2c)
        oled.fill(0)
        oled.text('Initializing...', 0, 0)
        oled.show()
    except Exception as e:
        print("display error:", e)
        #init_oled()
def display_message(message, ip_address):
    try:
        oled.fill(0)
        oled.text(f'Door ID: {DOOR_ID}', 0, 0)  # Display Door ID at the top
        oled.text("___________________", 0, 3)

        lines = message.split('\n')
        for i, line in enumerate(lines):
            oled.text(line, 0, 20 + i * 10)  # Adjust the y position for each line
        oled.text("__________________", 0, 47)
        oled.text(ip_address, 0, 57)  # Display IP address at the bottom
        oled.show()
    except Exception as e:
        greenled.off()
        redled.off()
        print("display error:", e)
        init_oled()
        
# Connect to WiFi
def connect_wifi(ssid, password):
    wlan = network.WLAN(network.STA_IF)
    wlan.active(True)
    wlan.connect(ssid, password)
    while not wlan.isconnected():
        time.sleep(0.5)
        print("Connecting to WiFi...")
    ip_address = wlan.ifconfig()[0]
    print("Connected to WiFi:", ip_address)
    display_message('WiFi Connected', ip_address)

    # Test connection to the server
    
    try:
        response = requests.get(f"http://{SERVER_IP}:{SERVER_PORT}/")
        if response.status_code == 200:
            print("Server connection successful")
            display_message('Server Connected', ip_address)
        else:
            print("Server connection failed")
            display_message('Server Fail', ip_address)
            time.sleep(5)
            while response.status_code != 200 :
                wlan.connect(ssid, password)
                response = requests.get(f"http://{SERVER_IP}:{SERVER_PORT}/")
                display_message('Reconnecting ...', ip_address)
                time.sleep(1)
    except Exception as e:
        print("Server connection error:", e)
        display_message(f'Server Error \n {e}', ip_address)
        time.sleep(5)
#         while response.status_code != 200 :
#             wlan.connect(ssid, password)
#             try :
#                 response = requests.get(f"http://{SERVER_IP}:{SERVER_PORT}/")
#                 display_message('Reconnecting ...', ip_address)
#                 time.sleep(1)
#             except:
#                 pass
# Function to send RFID UID to the server
def send_rfid_to_server(rfid_uid):
    url = f"http://{SERVER_IP}:{SERVER_PORT}/access"
    headers = {'Content-Type': 'application/json'}
    data = {
        'rfid_uid': rfid_uid,
        'door_id': DOOR_ID
    }
    response = requests.post(url, headers=headers, data=json.dumps(data))
    return response.json()

# Main loop to scan RFID tags
def main():
    # Retry mechanism for OLED initialization
    for _ in range(3):
        try:
            init_oled()
            break
        except Exception as e:
            print("OLED init error:", e)
            time.sleep(1)
    
    connect_wifi(WLAN_SSID, WLAN_PASS)
    ip_address = network.WLAN(network.STA_IF).ifconfig()[0]
    display_message('Scan your tag', ip_address)

    while True:
        
        (status, tag_type) = reader.request(reader.REQIDL)
        if status == reader.OK:
            (status, uid) = reader.SelectTagSN()
            if status == reader.OK:
                rfid_uid_decimal = ''.join([str(i) for i in uid])
                print("RFID UID:", rfid_uid_decimal)
                display_message('Checking...', ip_address)
                
                response = send_rfid_to_server(rfid_uid_decimal)
                
                if response.get('access_granted'):
                    user_upn = response.get('upn')
                    print("Access Granted:", user_upn)
                    display_message(f'Access Granted\n{user_upn}', ip_address)
                    # Turn on the LED to indicate door open
                    greenled.on()
                    # Add code here to open the door (e.g., trigger a relay)
                else:
                    print("Access Denied")
                    display_message('Access Denied', ip_address)
                    redled.on()

                time.sleep(2)  # Delay to avoid rapid repeated reads
                greenled.off()
                redled.off()  # Turn off the LED
                display_message('Scan your tag', ip_address)

if __name__ == "__main__":
    main()