from machine import Pin, I2C
import time
import keypad
import lcd1602

# Initialize I2C for LCD
i2c = I2C(0, scl=Pin(5), sda=Pin(4))  # Using GPIO 5 for SCL, GPIO 4 for SDA
lcd = lcd1602.Lcd(i2c)

# Food items and their prices
food_items = {
    "1": ("Idli", 30),
    "2": ("Dosa", 50),
    "3": ("Vada", 20),
    "4": ("Sambar Rice", 60),
    "5": ("Curd Rice", 40),
    "6": ("Biryani", 120),
    "7": ("Pongal", 35),
    "8": ("Uthappam", 55),
}

# Initialize keypad (row pins and column pins)
rows = [Pin(8, Pin.IN, Pin.PULL_UP), Pin(9, Pin.IN, Pin.PULL_UP),
        Pin(10, Pin.IN, Pin.PULL_UP), Pin(11, Pin.IN, Pin.PULL_UP)]

cols = [Pin(12, Pin.OUT), Pin(13, Pin.OUT), Pin(14, Pin.OUT), Pin(15, Pin.OUT)]

# Set columns to high initially
for col in cols:
    col.value(1)

# Dictionary to store the quantity of items selected
quantities = {item[0]: 0 for item in food_items.values()}

# Function to update the display with selected food items and total
def update_display():
    lcd.clear()
    lcd.putstr("Tamil Food Shop\n")
    for idx, (key, (item, qty)) in enumerate(quantities.items()):
        if qty > 0:
            lcd.putstr(f"{item}: {qty}x ₹{food_items[key][1]}\n")
    total = sum(food_items[key][1] * qty for key, qty in quantities.items())
    lcd.putstr(f"Total: ₹{total}")

# Function to read from the keypad
def read_keypad():
    for row_num, row in enumerate(rows):
        row.value(0)  # Set row to low to scan
        for col_num, col in enumerate(cols):
            if row.value() == 0:  # If a key is pressed
                key = str(row_num * 4 + col_num + 1)
                time.sleep(0.1)  # Debounce time
                return key
        row.value(1)  # Reset row to high
    return None  # No key pressed

# Main loop
while True:
    key = read_keypad()  # Read key from keypad
    
    if key is not None:
        if key in food_items:
            # Increment the quantity for the selected food item
            item_name, price = food_items[key]
            quantities[item_name] += 1
            update_display()  # Update the LCD display
        elif key == "9":  # You can add a reset or clear functionality
            # Reset the quantities
            quantities = {item[0]: 0 for item in food_items.values()}
            update_display()

    time.sleep(0.1)  # Small delay for the keypad scan