import PySimpleGUI as sg
import psutil
import sys

"""
    Another simple Desktop Widget using PySimpleGUI
    This time a RAM indicator.  The Widget is square.  
    The bottom section will be shaded to 
    represent the total amount CPU currently in use.
    Uses the theme's button color for colors.

    Copyright 2020 PySimpleGUI.org
"""

ALPHA = 0.5
THEME = 'Dark purple 6 '
GSIZE = (160, 160)
UPDATE_FREQUENCY_MILLISECONDS = 2 * 1000


def human_size(bytes, units=(' bytes', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB')):
    """ Returns a human readable string reprentation of bytes"""
    return str(bytes) + ' ' + units[0] if bytes < 1024 else human_size(bytes >> 10, units[1:])


sg.theme(THEME)
def main(location):
    graph = sg.Graph(GSIZE, (0, 0), GSIZE, key='-GRAPH-', enable_events=True)
    layout = [[graph]]

    window = sg.Window('CPU Usage Widget Square', layout, location=location, no_titlebar=True, grab_anywhere=True, margins=(0, 0), element_padding=(0, 0), alpha_channel=ALPHA, finalize=True, right_click_menu=[[''], 'Exit'])

    text_id2 = graph.draw_text(f'CPU', (GSIZE[0] // 2, GSIZE[1] // 4), font='Any 20', text_location=sg.TEXT_LOCATION_CENTER,                               color=sg.theme_button_color()[0])


    while True:  # Event Loop
        # ----------- update the graphics and text in the window ------------
        cpu_percent = psutil.cpu_percent(interval=1)
        # Draw the filled rectangle
        rect_height = int(GSIZE[1] * float(cpu_percent) / 100)
        rect_id = graph.draw_rectangle((0, rect_height), (GSIZE[0], 0), fill_color=sg.theme_button_color()[1], line_width=0)
        # Draw the % used text and the close "X" on bottom
        text_id1 = graph.draw_text(f'{int(cpu_percent)}%', (GSIZE[0] // 2, GSIZE[1] // 2), font='Any 40', text_location=sg.TEXT_LOCATION_CENTER, color=sg.theme_button_color()[0])
        # text_id3 = graph.draw_text('❎', (0, 0), font='Any 8', text_location=sg.TEXT_LOCATION_BOTTOM_LEFT, color=sg.theme_button_color()[0])
        # put the bar behind everything else
        graph.send_figure_to_back(rect_id)

        # update the window, wait for a while, then check for exit
        event, values = window.read(timeout=UPDATE_FREQUENCY_MILLISECONDS)
        if event == sg.WIN_CLOSED or event == 'Exit':
            break
        if event == '-GRAPH-':  # exit if clicked in the bottom left 20 x 20 pixel area
            if values['-GRAPH-'][0] < 20 and values['-GRAPH-'][1] < 20:
                break
        # erase figures so they can be redrawn
        graph.delete_figure(rect_id)
        graph.delete_figure(text_id1)
        # graph.delete_figure(text_id3)
    window.close()


if __name__ == '__main__':

    if len(sys.argv) > 1:
        location = sys.argv[1].split(',')
        location = (int(location[0]), int(location[1]))
    else:
        location = (None, None)
    main(location)