import sys,os
import curses
import threading
import time
import Queue

kList = [0,]	#this should definitely be replaced by a queue

def input_catcher(aStdscr):
    global kList
    while True:
        # Wait for next input
        k = aStdscr.getch()
        kList.append(k)
        time.sleep(0.01)
        if k == ord('q'):
            break
        

def draw_menu(stdscr):
    global kList
    cursor_x = 0
    cursor_y = 0
    m = 0

    # Clear and refresh the screen for a blank canvas
    stdscr.clear()
    stdscr.refresh()

    # Start colors in curses
    curses.start_color()
    curses.init_pair(1, curses.COLOR_CYAN, curses.COLOR_BLACK)
    curses.init_pair(2, curses.COLOR_RED, curses.COLOR_BLACK)
    curses.init_pair(3, curses.COLOR_BLACK, curses.COLOR_WHITE)

    #Start thread for input catcher
    threading.Thread(target=input_catcher, args=(stdscr,)).start()

    histList = []
    tempString = ''

    # Loop where k is the last character pressed
    while True:

        time.sleep(0.01)
        if len(kList) > 0:
            k = kList.pop(0)
        else:
            k = 0
    
        # Initialization
        stdscr.clear()
        height, width = stdscr.getmaxyx()

        m += 1

        if k == ord('q'):
            break
        elif k == curses.KEY_DOWN:
            cursor_y = cursor_y + 1
        elif k == curses.KEY_UP:
            cursor_y = cursor_y - 1
        elif k == curses.KEY_RIGHT:
            cursor_x = cursor_x + 1
        elif k == curses.KEY_LEFT:
            cursor_x = cursor_x - 1
        elif k == curses.KEY_ENTER:
            histList.append(tempString)
            tempString = ''
        elif k>0 and k<=255:
            tempString += chr(k)

        cursor_x = max(0, cursor_x)
        cursor_x = min(width-1, cursor_x)

        cursor_y = max(0, cursor_y)
        cursor_y = min(height-1, cursor_y)

        # Declaration of strings
        title = "Curses example"[:width-1]
        subtitle = "Written by Clay McLeod"[:width-1]
        keystr = "Last key pressed: {}".format(k)[:width-1]
        mstr = "Counter m : {}".format(m)[:width-1]
        tempStringFormatted = "test {}".format(tempString)
        statusbarstr = "Press 'q' to exit | STATUS BAR | Pos: {}, {}".format(cursor_x, cursor_y)
        if k == 0:
            keystr = "No key press detected..."[:width-1]

        # Centering calculations
        start_x_title = int((width // 2) - (len(title) // 2) - len(title) % 2)
        start_x_subtitle = int((width // 2) - (len(subtitle) // 2) - len(subtitle) % 2)
        start_x_keystr = int((width // 2) - (len(keystr) // 2) - len(keystr) % 2)
        start_y = int((height // 2) - 2)

        # Rendering some text
        whstr = "Width: {}, Height: {}".format(width, height)
        stdscr.addstr(0, 0, whstr, curses.color_pair(1))

        # Render status bar
        stdscr.attron(curses.color_pair(3))
        stdscr.addstr(height-1, 0, statusbarstr)
        stdscr.addstr(height-1, len(statusbarstr), " " * (width - len(statusbarstr) - 1))
        stdscr.attroff(curses.color_pair(3))

        stdscr.addstr(height-2, 0, tempStringFormatted)

        # Turning on attributes for title
        stdscr.attron(curses.color_pair(2))
        stdscr.attron(curses.A_BOLD)

        # Rendering title
        stdscr.addstr(start_y, start_x_title, title)

        # Turning off attributes for title
        stdscr.attroff(curses.color_pair(2))
        stdscr.attroff(curses.A_BOLD)

        # Print rest of text
        stdscr.addstr(start_y + 1, start_x_subtitle, subtitle)
        stdscr.addstr(start_y + 3, (width // 2) - 2, '-' * 4)
        stdscr.addstr(start_y + 5, start_x_keystr, keystr)
        stdscr.addstr(start_y + 7, start_x_keystr, mstr)
        stdscr.move(cursor_y, cursor_x)

        # Refresh the screen
        stdscr.refresh()

def main():
    curses.wrapper(draw_menu)

if __name__ == "__main__":
    main()