# SPDX-FileCopyrightText: Copyright (c) 2021 Jeff Epler for Adafruit Industries
#
# SPDX-License-Identifier: Unlicense

"""
This demo is designed for the Kaluga development kit version 1.3 with the
ILI9341 display.
"""

from ulab import numpy as np
from terminalio import FONT
import board
import busio
import displayio
import qrio
import adafruit_ov2640
from adafruit_display_text.bitmap_label import Label
from adafruit_ili9341 import ILI9341

print("Initializing display")
displayio.release_displays()
spi = busio.SPI(MOSI=board.LCD_MOSI, clock=board.LCD_CLK)
display_bus = displayio.FourWire(
    spi, command=board.LCD_D_C, chip_select=board.LCD_CS, reset=board.LCD_RST
)
display = ILI9341(display_bus, width=320, height=240, rotation=90)

print("Initializing camera")
bus = busio.I2C(scl=board.CAMERA_SIOC, sda=board.CAMERA_SIOD)
cam = adafruit_ov2640.OV2640(
    bus,
    data_pins=board.CAMERA_DATA,
    clock=board.CAMERA_PCLK,
    vsync=board.CAMERA_VSYNC,
    href=board.CAMERA_HREF,
    mclk=board.CAMERA_XCLK,
    mclk_frequency=20_000_000,
    size=adafruit_ov2640.OV2640_SIZE_QQVGA,
)
cam.flip_x = False
cam.flip_y = False
cam.colorspace = adafruit_ov2640.OV2640_COLOR_YUV

qrdecoder = qrio.QRDecoder(cam.width, cam.height)
bitmap = displayio.Bitmap(cam.width, cam.height, 65536)

# Create a greyscale palette
pal = displayio.Palette(256)
for i in range(256):
    pal[i] = 0x10101 * i

label = Label(
    font=FONT,
    text="Scan QR Code...",
    color=0xFFFFFF,
    background_color=0x0,
    padding_top=2,
    padding_left=2,
    padding_right=2,
    padding_bottom=2,
    anchor_point=(0.5, 1.0),
    anchored_position=(160, 230),
)
# Show the camera image at 2x size
g1 = displayio.Group(scale=2)
view = np.frombuffer(bitmap, dtype=np.uint8)
tg = displayio.TileGrid(
    bitmap,
    pixel_shader=pal,
)
tg.flip_y = True
g1.append(tg)
g = displayio.Group()
g.append(g1)
g.append(label)
display.root_group = g
display.auto_refresh = False

old_payload = None
while True:
    cam.capture(bitmap)

    for row in qrdecoder.decode(bitmap, qrio.PixelPolicy.EVEN_BYTES):
        payload = row.payload
        try:
            payload = payload.decode("utf-8")
        except UnicodeError:
            payload = str(payload)
        print(payload)

    # Clear out the odd bytes, so that the bitmap displays as greyscale
    view[1::2] = 0
    bitmap.dirty()
    display.refresh(minimum_frames_per_second=0)