import PySimpleGUI as sg
import re

'''
 Demo of using a borderless window to show possible matches for autocomplete feature
'''

def autocomplete_popup_show(text_list):
 layout = [[ sg.Listbox(values=text_list,
 size=(15, len(text_list)),
 change_submits=True, bind_return_key=True,
 key='-FLOATING-LISTBOX-', enable_events=True) ]]

 return sg.Window("Borderless Window",
 layout,
 default_element_size=(12, 1),
 auto_size_text=False, keep_on_top=True,
 no_titlebar=True, grab_anywhere=True,
 return_keyboard_events=True,
 auto_size_buttons=False,
 background_color='black',
 default_button_element_size=(12, 1),
 location=(1320, 622), finalize=True)


def predict_text(input, lista):
 pattern = re.compile('.*' + input + '.*')
 return [w for w in lista if re.match(pattern, w)]


def main():

 choices = ['ABC' + str(i) for i in range(30)] # dummy data

 layout = [[sg.Text('Your typed chars appear here:')],
 [sg.Input(key='-INPUT-', size=(10, 1))],
 [sg.Button('Show'), sg.Button('Exit')], ]

 window = sg.Window('Autocomplete Demo', layout, return_keyboard_events=True)

 sel_item = -1
 fwindow = list_elem = values2 = None
 while True: # Event Loop
 event, values = window.read(timeout=500)

 if event in (None, 'Exit'):
 break

 if event != sg.TIMEOUT_KEY:
 # print(f'event1 {event}')
 in_val = values['-INPUT-']
 prediction_list = predict_text(str(in_val), choices)
 if prediction_list:
 try:
 fwindow.close()
 except:
 pass
 fwindow = autocomplete_popup_show(prediction_list)
 list_elem = fwindow['-FLOATING-LISTBOX-']
 if event == '_COMBO_':
 sg.popup('Chose', values['_COMBO_'])

 if event.startswith('Down') or event.startswith('special 16777237'):
 sel_item = sel_item + (sel_item < len(prediction_list))
 list_elem.update(set_to_index=sel_item)

 elif event.startswith('Up') or event.startswith('special 16777235'):
 sel_item = sel_item - (sel_item > 0)
 list_elem.update(set_to_index=sel_item)

 if event == '\r' or event.startswith('special 16777220'):
 chosen = values2['-FLOATING-LISTBOX-'] if values2 is not None else None
 if chosen:
 window['-INPUT-'].update(chosen[0], select=True)
 fwindow.close()
 sel_item = -1

 if event.startswith('Escape') or event.startswith('special 16777216'):
 window['-INPUT-'].update('')

 try:
 event2, values2 = fwindow.read(timeout=10)
 # if event2 == '-FLOATING-LISTBOX-' and skip_event and QT:
 # skip_event = False
 if event2 != sg.TIMEOUT_KEY and event2 is not None:
 # print(f'event2 {event2}')
 fwindow.close()
 window['-INPUT-'].update(values2['-FLOATING-LISTBOX-']
 [0], select=True)
 sel_item = -1
 fwindow = None
 except:
 pass

 window.close()

if __name__ == '__main__':
 main()