#!/usr/bin/env python3


import curses,time,json,sys

dataPath = '/home/lickthecheese/nboard/nboard.json'

allowedChars = "█▒░ `~1234567890-=!@#$%^&*()_+qwertyuiop[]\\QWERTYUIOP{}|asdfghjkl;'ASDFGHJKL:\"zxcvbnm,./ZXCVBNM<>?"
data = {}

def main(stdscr):
    stdscr.erase()
    stdscr.refresh()
    k='NOU'
    height, width = stdscr.getmaxyx()
    vx = vy = tx = ty = nl = 0

    cx = width // 2
    cy = height // 2

    stdscr.move(cy,cx)
    while True:
        cx = width // 2
        cy = height // 2

        stdscr.clear()

        height, width = stdscr.getmaxyx()


        # detect where to move cursor
        if k == 'KEY_UP':
            vy += -1
            nl = vx
        if k == 'KEY_DOWN':
            vy += 1
            nl = vx
        if k == 'KEY_LEFT':
            vx += -1
            nl = vx
        if k == 'KEY_RIGHT':
            vx += 1
            nl = vx
        if k == '\n':
            vx = nl
            vy += 1
        if k == 'KEY_BACKSPACE':
            vx += -1

        # make sure the cursor is on the screen
        # this is not nessesary for the view as it is infinite
        cx = max(0, cx)
        cx = min(width-1, cx)

        cy = max(0, cy)
        cy = min(height-2, cy)

        # calculate true position
        tx = cx + (vx) - width // 2
        ty = cy + (vy) - (height-1) // 2

        # get json data
        with open(dataPath, 'r') as openfile:
            data = json.load(openfile)
        
        # if valid key pressed, write it
        if k in allowedChars:
            data[str((ty,tx))] = k
            vx = vx+1
            with open(dataPath, 'w') as outfile:
                json.dump(data, outfile)
            tx = cx + (vx) - width // 2

        # draw the screen
        stdscr.move(0, 0)
        for y in range(height-1):
            for x in range(width):
                stdscr.move(y,x)
                stdscr.addstr(data.get(str((ty - cy + y,tx - cx + x)), ' '))


        # display some info
        stdscr.addstr(height-1, 0, 'x: {}, y: {}, arrow keys to move'.format(tx, 0-ty)[:width-1]) 


        # move the cursor where its actually supposed to be
        stdscr.move(cy,cx)

        #print(str(k)) # debug keycodes

        k = stdscr.getkey()
       


if __name__ == "__main__":
    if len(sys.argv) > 1 and (sys.argv[1] == '--help' or sys.argv[1] == 'help'):
        print("""
nboard is like yourworldoftext.com, except its in a terminal.

use the arrow keys to move arount
once you are in the place you want, you can start typing!

please report any bugs to ~xfnw on IRC or on the tildegit page,
https://tildegit.org/xfnw/nboard
""")
    else:
        try:
            curses.wrapper(main)
        except KeyboardInterrupt:
            print('bye!')