import subprocess, time, re, math, threading, queue
import PySimpleGUI as sg
from sys import platform

STEP_SIZE = 1
NO_OF_PINGS = 500
MAX_PING = 250
CANVAS_SIZE = (800, 600)
matchList = ['', '', '']
ping = ""


def main_loop(gui_queue):
    global matchList, ping
    sg.change_look_and_feel('Dark Blue 3')
    layout = [
        [sg.Text('Enter domain name of what you want to ping')],
        [sg.Input(size=(37, 1), key='dn')],
        [sg.Ok(), sg.Cancel()]
    ]

    window = sg.Window('Domain name entry', layout)
    event, value = window.read()
    if event is None or event == 'Cancel':
        return

    matchList[0] = value['dn']
    if platform == 'darwin' or platform == 'linux' or platform == 'linux2':
        matchList[1] = ''.join(re.findall('Ping statistics for (\d+.\d+.\d+.\d+)', subprocess.run(['ping', '-c', '1', matchList[0]], capture_output=True).stdout.decode()))
    elif platform == 'win32':
        matchList[1] = ''.join(re.findall('Ping statistics for (\d+.\d+.\d+.\d+)', subprocess.run(['ping', '-n', '1', matchList[0]], capture_output=True).stdout.decode()))

    window.close()
    del window

    sg.set_options(element_padding=(0,0))

    sg.change_look_and_feel('Dark Blue 3')
    layout = [
        [sg.Text("The IP address of hostname '" + matchList[0] + "' is: " + matchList[1], size=(100, 1), )],
        [sg.Graph(CANVAS_SIZE, (0, 0), (NO_OF_PINGS, MAX_PING),
        background_color='white', key='graph')],
        [sg.Button('Exit', button_color=('black', 'white'))]
    ]

    window = sg.Window(matchList[0], layout, grab_anywhere=True, no_titlebar=False, use_default_focus=False, finalize=True)
    graph = window['graph']

    threading.Thread(target=ping, args=(10, gui_queue), daemon=True).start()

    i, j = 0, 1
    prev_x, prev_y = 0, 0
    graph_value = 0

    while True:
        graph_value = 0
        event, values = window.read(timeout=25)
        if event == 'Exit' or event is None:
            break

        while True:
            try:
                graph_value = gui_queue.get_nowait()
            except queue.Empty:
                break

        if graph_value > 0:
            print("Iteration #" + str(j))

            if graph_value > MAX_PING:
                graph_value = MAX_PING
            if graph_value < 0:
                graph_value = 0

            new_x, new_y = i, graph_value

            if i >= NO_OF_PINGS:
                graph.move(-STEP_SIZE, 0)
                prev_x = prev_x - STEP_SIZE

            graph.draw_line((prev_x, prev_y), (new_x, new_y), color='red')
            prev_x, prev_y = new_x, new_y
            i += STEP_SIZE if i < NO_OF_PINGS else 0
            j += 1

    window.close()

def ping(run_freq, gui_queue):
    while True:
        try:
            time.sleep(run_freq/1000)
            ping = ""
            if platform == 'darwin' or platform == 'linux' or platform == 'linux2':
                ping = subprocess.run(['ping', '-c', '1', matchList[0]], capture_output=True, text=True)
            elif platform == 'win32':
                ping = subprocess.run(['ping', '-n', '1', matchList[0]], capture_output=True, text=True)
            cmdOutput = ''.join(re.findall('time=(\d+)', ping.stdout))
            if cmdOutput.isdigit() == True:
                gui_queue.put(int(cmdOutput))
        except ValueError:
            continue


if __name__ == '__main__':
    gui_queue = queue.Queue()

    main_loop(gui_queue)