import PySimpleGUI as sg
import sys
import datetime

"""
    Another simple Desktop Widget using PySimpleGUI
    The "Days Since _______" Widget
    
    This widget counts the number of days since some date of your choosing.  
    Maybe you want to track the number of days since the start of the year.
    Or perhaps when you got married.... or divorced.... or stopped some activity
    Or started some activity.... you get the idea.  It tracks a time delta in days  

    Copyright 2021 PySimpleGUI
"""

ALPHA = 0.9                 # Initial alpha until user changes
THEME = 'Dark green 3'      # Initial theme until user changes
refresh_font = sg.user_settings_get_entry('-refresh font-', 'Courier 8')
title_font = sg.user_settings_get_entry('-title font-', 'Courier 8')
main_number_font = sg.user_settings_get_entry('-main number font-', 'Courier 70')

# May add ability to change theme from the user interface.  For now forcing to constant

GSIZE = (160, 160)
UPDATE_FREQUENCY_MILLISECONDS = 1000*60*60      # update every hour

def choose_theme(location):
    layout = [[sg.Text('Try a theme')],
              [sg.Listbox(values=sg.theme_list(), size=(20, 20), key='-LIST-', enable_events=True)],
              [sg.OK(), sg.Cancel()]]

    window = sg.Window('Look and Feel Browser', layout, location=location)
    old_theme = sg.theme()
    while True:  # Event Loop
        event, values = window.read()
        if event in (sg.WIN_CLOSED, 'Exit', 'OK', 'Cancel'):
            break
        sg.theme(values['-LIST-'][0])
        test_window=make_window(location=(location[0]-200, location[1]), test_window=True)
        test_window.read(close=True)
        if sg.popup_yes_no(f'Do you want to keep {values["-LIST-"]}?', location=location) == 'Yes':
            break
    window.close()

    if event not in ('Cancel', sg.WIN_CLOSED) and values['-LIST-']:
        sg.theme(values['-LIST-'][0])
        sg.user_settings_set_entry('-theme-', values['-LIST-'][0])
        return values['-LIST-'][0]
    else:
        sg.theme(old_theme)
    return  None

def make_window(location, test_window=False):
    title = sg.user_settings_get_entry('-title-', '')
    if not test_window:
        theme = sg.user_settings_get_entry('-theme-', THEME)
        sg.theme(theme)

    alpha = sg.user_settings_get_entry('-alpha-', ALPHA)

    layout = [[sg.Text(title, size=(20,1), font=title_font, justification='c', k='-TITLE-')],
              [sg.Text('0', size=(3,1), font=main_number_font, k='-T-', justification='c', enable_events=test_window)]]

    if test_window:
        layout += [[sg.Text('Click to close', font=title_font)]]
        right_click_menu = [[''], ['Choose Date', 'Exit']]
    else:
        right_click_menu = [[''], ['Choose Date', 'Choose Title', 'Edit Me', 'Theme', 'Save Location', 'Refresh', 'Show Refresh', 'Hide Refresh', 'Alpha', [str(x) for x in range(1,11)],'Exit', ]]

    layout += [[sg.pin(sg.Text(size=(15,2), font=refresh_font, k='-REFRESHED-', justification='c', visible=sg.user_settings_get_entry('-show refresh-', True)))]]


    window = sg.Window('Day Number', layout, location=location, no_titlebar=True, grab_anywhere=True, margins=(0, 0), element_justification='c', element_padding=(0, 0), alpha_channel=alpha, finalize=True, right_click_menu=right_click_menu)

    return window

def main(location):
    loc =  sg.user_settings_get_entry('-location-', location)
    window = make_window(loc)

    saved_date = sg.user_settings_get_entry('-start date-', (1,1,2021))
    start_date = datetime.datetime(saved_date[2], saved_date[0], saved_date[1])

    while True:             # Event Loop
        # First update the status information
        delta = datetime.datetime.now() - start_date
        window['-T-'].update(f'{delta.days}')

        # for debugging show the last update date time
        window['-REFRESHED-'].update(datetime.datetime.now().strftime("%m/%d/%Y\n%I:%M:%S %p"))

        # -------------- Start of normal event loop --------------
        event, values = window.read(timeout=UPDATE_FREQUENCY_MILLISECONDS)
        print(event, values)
        if event == sg.WIN_CLOSED or event == 'Exit':
            break
        if event == 'Edit Me':
            sg.execute_editor(__file__)
        elif event == 'Choose Date':
            new_start = sg.popup_get_date(location=window.current_location())
            if new_start is not None:
                start_date = datetime.datetime(new_start[2], new_start[0], new_start[1])
                sg.user_settings_set_entry('-start date-', new_start)
        elif event == 'Choose Title':
            new_title = sg.popup_get_text('Choose a title for your date', location=window.current_location())
            if new_title is not None:
                window['-TITLE-'].update(new_title)
                sg.user_settings_set_entry('-title-', new_title)
        elif event == 'Show Refresh':
            window['-REFRESHED-'].update(visible=True)
            sg.user_settings_set_entry('-show refresh-', True)
        elif event == 'Save Location':
            sg.user_settings_set_entry('-location-', window.current_location())
        elif event == 'Hide Refresh':
            window['-REFRESHED-'].update(visible=False)
            sg.user_settings_set_entry('-show refresh-', False)
        elif event in [str(x) for x in range(1,11)]:
            window.set_alpha(int(event)/10)
            sg.user_settings_set_entry('-alpha-', int(event)/10)
        elif event == 'Theme':
            loc = window.current_location()
            if choose_theme(loc) is not None:
                # this is result of hacking code down to 99 lines in total. Not tried it before. Interesting test.
                _, window = window.close(), make_window(loc)

    window.close()


if __name__ == '__main__':
    # To start the window at a specific location, get this location on the command line
    # The location should be in form x,y with no spaces
    if len(sys.argv) > 1:
        location = sys.argv[1].split(',')
        location = (int(location[0]), int(location[1]))
    else:
        location = (None, None)
    main(location)