import os
import re
import subprocess
import time

class threeFingers:
    def __init__(self, x, y):
        self.start_x = x
        self.start_y = y
    def endGesture(self, x, y, f):
        if not f==3:
            diff_x = x-self.start_x
            print diff_x
            diff_y = y-self.start_y
                if diff_x > 100:
                os.system("xdotool key a")
            elif diff_x < -100:
                os.system("xdotool key b")
            return True
        else:
            return False

class fourFingers:
    def __init__(self, x, y):
        self.start_x = x
        self.start_y = y
    def endGesture(self, x, y, f):
        if not f==4:
            diff_x = x-self.start_x
            diff_y = y-self.start_y
            if diff_x > 100:
                os.system("xdotool key c")
            elif diff_x < -100:
                os.system("xdotool key d")
            return True
        else:
            return False


if __name__ == "__main__":
    cmd = 'synclient -m 100'

    p = subprocess.Popen(cmd, stdout = subprocess.PIPE, stderr = subprocess.STDOUT, shell = True)
    skip = False
    first = True
    start = False
    start_x = 0
    start_y = 0
    diff_x = 0
    diff_y = 0
    timeStart = 0
    timeEnd = 0
    threeF = None
    fourF = None
    finger3 = False
    finger4 = False
    try:
        while True:
            line = p.stdout.readline()
            if not line:
                break
            try:
                tokens = [x for x in re.split('([^0-9\.])+', line.strip()) if x.strip()]
                x, y, fingers = int(tokens[1]), int(tokens[2]), int(tokens[4])
        if not start:
            if fingers==3:
                threeF = threeFingers(x, y)
                start = True
                finger3 = True
                timeStart = time.time()
            elif fingers==4:
                fourF = fourFingers(x, y)
                start = True
                finger4 = True
                timeStart = time.time()
        if start:
            #Gestures have a timeout
            if time.time()-timeStart>0.37:
                start = False
                            threeF = None
                fourF = None
                finger3 = False
                finger4 = False
            else:
                if finger3:
                    if threeF.endGesture(x, y, fingers):
                        threeF = None
                        finger3 = False
                        start = False
                elif finger4:
                    if fourF.endGesture(x, y, fingers):
                        fourF = None
                        finger4 = False
                        start = False
            except (IndexError, ValueError):
                pass
    except KeyboardInterrupt:
        pass