import PySimpleGUI as sg
import re

'''
    Exampel of Input element features.
'''

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

    autocomplete_popup = sg.Window("Borderless Window",
                                   autocomplete_popup_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)

    return window


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


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('Window Title', layout, return_keyboard_events=True)

sel_item = -1
skip_event = False
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)
            skip_event = True

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

        if event == '\r' or event.startswith('special 16777220'):
            chosen = values2['-FLOATING-LISTBOX-']
            window['-INPUT-'].update(values2['-FLOATING-LISTBOX-']
                                     [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()