from pathlib import Path
import os
import time
import logging
from watchdog.observers import Observer
from watchdog.events import LoggingEventHandler

from pdf2image import convert_from_path

downloads_path = str(Path.home() / "Downloads")
labelPathDir = downloads_path

labelPath = labelPathDir + "label.pdf"
labelPathRot90 = labelPathDir + "label_rot90.pdf"


printer_identifier = "tcp://192.168.1.70"
dpi = 300

imageHeight29mm = 343
imageHeight62mm = 745
imageHeightVersand102 = 3505


def checkTolerance(isNum, shouldNum):
    tol = 10
    maxNum = shouldNum + tol
    minNum = shouldNum - tol
    return (isNum < maxNum and isNum > minNum)


def printPDF(path):
    if (os.path.isfile(path)):
        print("label detected", path)
        pages = convert_from_path(path, dpi)
        for page in pages:

            try:
                page.save('label.png', 'PNG')

                pngHeight = page.height
                if (path == labelPathRot90):
                    pngHeight = page.width
                print("height: ", pngHeight)

                labelHeight = 0

                if (checkTolerance(pngHeight, imageHeight29mm)):
                    labelHeight = 29
                if (checkTolerance(pngHeight, imageHeight62mm)):
                    labelHeight = 62

                if (checkTolerance(pngHeight, imageHeightVersand102)):
                    labelHeight = 102
                    h = page.height/2
                    spacing = 100

                    # box=(left, upper, right, lower)
                    page.crop((0, spacing, page.width, h-spacing)
                              ).save('label.png', 'PNG')

                if (labelHeight != 0):
                    os.system('brother_ql -m QL-1060N -p ' +
                              printer_identifier + ' print -d -l ' + str(labelHeight) + ' label.png -r 90')
                else:
                    print("UNKNOWN LABEL PICTURE HEIGHT!")
            except:
                print("An exception occurred")
        os.remove(path)


printPDF(labelPath)
printPDF(labelPathRot90)


class Event(LoggingEventHandler):
    def on_modified(self, event):
        path = event.src_path
        if (path == labelPath or path == labelPathRot90):
            printPDF(path)


if __name__ == "__main__":
    logging.basicConfig(level=logging.INFO,
                        format='%(asctime)s - %(message)s',
                        datefmt='%Y-%m-%d %H:%M:%S')
    path = labelPathDir  # sys.argv[1] if len(sys.argv) > 1 else '.'
    event_handler = Event()
    observer = Observer()
    observer.schedule(event_handler, path, recursive=True)
    observer.start()
    try:
        while True:
            time.sleep(1)
    except KeyboardInterrupt:
        observer.stop()
    observer.join()