"""
An example "program" which can be used with the ProgramChooser library, see also main.py
Copyright (C) 2024  Benjamin Burkhardt <bluefox@privacynerd.de>

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
"""

"""
@ Feature:   Fades "HELLO" over two lines in and out 
"""

import machine
from machine import I2C, Pin
from PCF8574 import I2C_LCD
import time

I2C_ADDR     = 0x27
I2C_NUM_ROWS = 2
I2C_NUM_COLS = 16

i2c = I2C(0, sda=Pin(0), scl=Pin(1), freq=400000)
lcd = I2C_LCD(i2c, I2C_ADDR, I2C_NUM_ROWS, I2C_NUM_COLS)

lcd.custom_char(0, bytearray([0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03]))  # right
lcd.custom_char(1, bytearray([0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18]))  # left
lcd.custom_char(2, bytearray([0x00,0x00,0x00,0x00,0x00,0x00,0x1F,0x1F]))  # 2-down
lcd.custom_char(3, bytearray([0x1F,0x1F,0x00,0x00,0x00,0x00,0x00,0x00]))  # 2-up
lcd.custom_char(4, bytearray([0x1F,0x1F,0x00,0x00,0x00,0x00,0x00,0x1F]))  # e-up
lcd.custom_char(5, bytearray([0x1F,0x00,0x00,0x00,0x00,0x00,0x1F,0x1F]))  # e-down
lcd.custom_char(6, bytearray([0x18,0x18,0x18,0x18,0x18,0x18,0x1F,0x1F]))  # l-down
lcd.custom_char(7, bytearray([0x00,0x00,0x00,0x00,0x00,0x00,0x18,0x18]))  # l-right

line1 = str(chr(0) + chr(2) + chr(1) + chr(0) + chr(4) + " " + chr(1) + " " + chr(1) + " " + chr(0) + chr(3) + chr(1))
line2 = str(chr(0) + chr(3) + chr(1) + chr(0) + chr(5) + " " + chr(6) + chr(7) + chr(6) + chr(7) + chr(0) + chr(2) + chr(1))


def right2left(line1, line2, speed=0.3):
    padding = "                "  # 16 spaces
    line2 = padding + line2 + padding
    line1 = padding + line1 + padding
    for i in range(32):
        line2 = line2[1:]
        line1 = line1[1:]
        lcd.putstr(line1[0:16] + line2[0:16])
        time.sleep(speed)


def top2bottom(line1, line2, speed=0.2):
    lcd.clear()
    time.sleep(speed)
    lcd.putstr(line2)
    time.sleep(speed)
    lcd.clear()
    lcd.putstr(line1)
    lcd.move_to(0,1)
    lcd.putstr(line2)
    time.sleep(speed)
    lcd.clear()
    lcd.move_to(0,1)
    lcd.putstr(line1)
    time.sleep(speed)
    lcd.clear()
    time.sleep(speed)

def run():  # for the ProgramChooser as callback
    right2left(line1, line2, 0.1)
    top2bottom(line1, line2)
    

if __name__ == "__main__":
    while True:
        right2left(line1, line2, 0.1)
        top2bottom(line1, line2)