# SPDX-FileCopyrightText: 2017 Tony DiCola for Adafruit Industries
# SPDX-FileCopyrightText: 2017 James DeVito for Adafruit Industries
# SPDX-License-Identifier: MIT

# This example is for use on (Linux) computers that are using CPython with
# Adafruit Blinka to support CircuitPython libraries. CircuitPython does
# not support PIL/pillow (python imaging library)!

import time
import subprocess

from board import SCL, SDA
import busio
from PIL import Image, ImageDraw, ImageFont
import adafruit_ssd1306


# Create the I2C interface.
i2c = busio.I2C(SCL, SDA)

# Create the SSD1306 OLED class.
# The first two parameters are the pixel width and pixel height.  Change these
# to the right size for your display!
disp = adafruit_ssd1306.SSD1306_I2C(128, 32, i2c)

# Clear display.
disp.fill(0)
disp.show()

# Create blank image for drawing.
# Make sure to create image with mode '1' for 1-bit color.
width = disp.width
height = disp.height
image = Image.new("1", (width, height))

# Get drawing object to draw on image.
draw = ImageDraw.Draw(image)

# Draw a black filled box to clear the image.
draw.rectangle((0, 0, width, height), outline=0, fill=0)

# Draw some shapes.
# First define some constants to allow easy resizing of shapes.
padding = -2
top = padding
bottom = height - padding
# Move left to right keeping track of the current x position for drawing shapes.
x = 0


# Load default font.
font = ImageFont.load_default()

# Alternatively load a TTF font.  Make sure the .ttf font file is in the
# same directory as the python script!
# Some other nice fonts to try: http://www.dafont.com/bitmap.php
# font = ImageFont.truetype('/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf', 9)

while True:

    # Draw a black filled box to clear the image.
    draw.rectangle((0, 0, width, height), outline=0, fill=0)

    # Shell scripts for system monitoring from here:
    # https://unix.stackexchange.com/questions/119126/command-to-display-memory-usage-disk-usage-and-cpu-load
    cmd = "hostname -I | cut -d\' \' -f1"
    #cmd = "hostname -I |cut -f 2 -d ' '"
    IP = subprocess.check_output(cmd, shell = True )
    cmd = "top -bn1 | grep load | awk '{printf \"CPU Load: %.2f\", $(NF-2)}'"
    CPU = subprocess.check_output(cmd, shell = True )
    cmd = "free -m | awk 'NR==2{printf \"Mem: %s/%sMB %.2f%%\", $3,$2,$3*100/$2 }'"
    MemUsage = subprocess.check_output(cmd, shell = True )
    cmd = "df -h | awk '$NF==\"/\"{printf \"Disk: %d/%dGB %s\", $3,$2,$5}'"
    Disk = subprocess.check_output(cmd, shell = True )
    cmd = "vcgencmd measure_temp |cut -f 2 -d '='"
    temp = subprocess.check_output(cmd, shell = True )

    #cmd = "hostname -I | cut -d' ' -f1"
    #IP = subprocess.check_output(cmd, shell=True).decode("utf-8")
    #cmd = 'cut -f 1 -d " " /proc/loadavg'
    #CPU = subprocess.check_output(cmd, shell=True).decode("utf-8")
    #cmd = "free -m | awk 'NR==2{printf \"Mem: %s/%s MB  %.2f%%\", $3,$2,$3*100/$2 }'"
    #MemUsage = subprocess.check_output(cmd, shell=True).decode("utf-8")
    #cmd = 'df -h | awk \'$NF=="/"{printf "Disk: %d/%d GB  %s", $3,$2,$5}\''
    #Disk = subprocess.check_output(cmd, shell=True).decode("utf-8")

    # Write four lines of text.
    draw.text((x, top),  "IP: " + str(IP,'utf-8'), font=font, fill=255)
    draw.text((x, top+8),  str(CPU,'utf-8') + " " + str(temp,'utf-8') , font=font, fill=255)
    draw.text((x, top+16), str(MemUsage,'utf-8'), font=font, fill=255)
    draw.text((x, top+25), str(Disk,'utf-8'), font=font, fill=255)
    #draw.text((x, top),       "IP: " + str(IP),  font=font, fill=255)
    #draw.text((x, top+8),     str(CPU), font=font, fill=255)
    #draw.text((x, top+16),    str(MemUsage),  font=font, fill=255)
    #draw.text((x, top+25),    str(Disk),  font=font, fill=255)


    #draw.text((x, top + 0), "IP: " + IP, font=font, fill=255)
    #draw.text((x, top + 8), "CPU load: " + CPU, font=font, fill=255)
    #draw.text((x, top + 16), MemUsage, font=font, fill=255)
    #draw.text((x, top + 25), Disk, font=font, fill=255)

    # Display image.
    disp.image(image)
    disp.show()
    time.sleep(0.1)