#!/usr/bin/env python3
# made for samsung galaxy note 4
# only works with stylus
# open phone app, dial *#0*#, choose “Black”
import argparse
import subprocess
from xdo import Xdo

parser = argparse.ArgumentParser(description='Use android phone stylus as input method')
parser.add_argument('--pos', type=str, default='100x100+0x0', help='Position on phone to use in percent (e.g. 40x40+10x10)')
parser.add_argument('--screen', type=str, default='1920x1080+0x0', help='Screen resolution and offset')
parser.add_argument('--phone', type=str, default='12544x7056', help='Phone resolution (not necessarily equal to the phone’s screen resolution)')
args = parser.parse_args()

screen_res = tuple(map(int, args.screen.split('+')[0].split('x')))
offset     = tuple(map(int, args.screen.split('+')[1].split('x')))
phone_res  = tuple(map(int, args.phone.split('x')))

limits = [[0, 0], [0, 0]]
limits[0][0] = int(args.pos.split('+')[1].split('x')[0]) / 100 * phone_res[0]
limits[0][1] = limits[0][0] + int(args.pos.split('+')[0].split('x')[0]) / 100 * phone_res[0]
limits[1][0] = int(args.pos.split('+')[1].split('x')[1]) / 100 * phone_res[1]
limits[1][1] = limits[1][0] + int(args.pos.split('+')[0].split('x')[1]) / 100 * phone_res[1]

def real_value(axis, value):
    if axis == 1:
        value = phone_res[1] - value
    # https://stackoverflow.com/a/929107
    return int(((value - limits[axis][0]) * screen_res[axis]) / (limits[axis][1] - limits[axis][0]))

update = 0
x = 0
y = 0
pressure = 0

xdo = Xdo()

process = subprocess.Popen(['adb', 'shell', 'getevent', '-q', '-l'], stdout=subprocess.PIPE)

for line in process.stdout:
    line = line.decode('utf-8')
    line = line.split()
    if line[1] != 'EV_ABS':
        continue
    event = line[2]
    value = int('0x' + line[3], 16)

    if event == 'ABS_PRESSURE':
        if value == 0 and pressure != 0:
            xdo.mouse_up(0, 1)
        elif pressure == 0:
            xdo.mouse_down(0, 1)
        pressure = value

    # Y and X flipped (landscape)
    elif event == 'ABS_Y':
        old_x = x
        x = real_value(0, value)
        if old_x != x:
            update += 1

    elif event == 'ABS_X':
        old_y = y
        y = real_value(1, value)
        if old_y != y:
            update += 1

    if update == 2:
        update = 0
        if 0 <= x < screen_res[0] and 0 <= y < screen_res[1]:
            xdo.move_mouse(x + offset[0], y + offset[1])