import json
import machine
import time
from lcd_api import LcdApi
from pico_i2c_lcd import I2cLcd
from machine import Pin

ok = Pin(32, Pin.IN, Pin.PULL_UP)
up = Pin(34, Pin.IN, Pin.PULL_UP)
down = Pin(12, Pin.IN, Pin.PULL_UP)

def lcdDisplay(lcd, label, depth):
  lcd.clear()
  if depth == 0:
    lcd.putstr('Choisir une classe  ')
  else:
    lcd.putstr('Choisir un eleve    ')
  lcd.putstr(label)

def selectPasswd(bdd, lcd):
  current = bdd
  current_i = 0
  current_max = len(current)
  current_keys = list(current.keys())
  old_name = ""
  depth = 0
  changed = True
  while depth < 2:
    old_i = current_i
    if up.value() == 0:
      current_i += 1
      changed = True
    if down.value() == 0:
      current_i -= 1
      changed = True
    current_i = current_i % current_max
    if ok.value() == 0:
      depth += 1
      old_name = current_keys[current_i]
      current = current[current_keys[current_i]]
      current_i = 0
      current_max = len(current)
      current_keys = list(current.keys())
      changed = True
    if changed and depth < 2:
       lcdDisplay(lcd, current_keys[current_i], depth)
    changed = False
    time.sleep(0.2)
  return (old_name, current['passwd'])

# Chargement de la BDD JSON
bdd = {}
with open('bdd.json', 'r') as json_file:
  bdd = json.load(json_file)
print("JSON DB loaded !")

# Initialisation du LCD
i2c = machine.I2C(0, sda=machine.Pin(21), scl=machine.Pin(22))
lcd = I2cLcd(i2c, 0x27, 4, 20)

while True:
  name, passwd = selectPasswd(bdd, lcd)
  lcd.clear()
  lcd.putstr(f"Sending '{passwd}' for {name} ...")
  time.sleep(3)