import os
import subprocess
import shutil
import signal
import tempfile
import time

from PIL import Image

try:
    from pyA20.gpio import gpio, port
except ImportError:
    from unittest.mock import Mock
    gpio = Mock()
    class Tmpobj():
        pass
    port = Tmpobj()
    port.PB3 = 42
    port.PB4 = 42
    port.PB5 = 42
    port.PB6 = 42
    port.PB7 = 42

from bureau import Bureau, add_api


class Photography(Bureau):
    """
    The Photography dept. provides document camera and other image
    capture services for other bureaus.
    """

    name = "Photography Dept."
    prefix = "PX"
    version = 0
    landscape_pin = port.PB3
    a5_pin = port.PB5
    a4_pin = port.PB4
    a6_pin = port.PB6
    doc_light_pin = port.PB7

    def __init__(self):
        Bureau.__init__(self)
        
        # set up the gpios for lamp & knobs
        gpio.init()
        gpio.setcfg(self.doc_light_pin, gpio.OUTPUT)
        gpio.output(self.doc_light_pin, gpio.LOW)

        # set pins and pullups for switches
        gpio.setcfg(self.landscape_pin, gpio.INPUT)
        gpio.pullup(self.landscape_pin, gpio.PULLUP)
        gpio.setcfg(self.a4_pin, gpio.INPUT)
        gpio.pullup(self.a4_pin, gpio.PULLUP)
        gpio.setcfg(self.a5_pin, gpio.INPUT)
        gpio.pullup(self.a5_pin, gpio.PULLUP)
        gpio.setcfg(self.a6_pin, gpio.INPUT)
        gpio.pullup(self.a6_pin, gpio.PULLUP)

        # make sure tmp dir exists
        tmpdir = "/tmp/webcam"
        if not os.path.exists(tmpdir):
            os.mkdir(tmpdir)

    def _doc_light_on(self):
        gpio.output(self.doc_light_pin, gpio.HIGH)

    def _doc_light_off(self):
        gpio.output(self.doc_light_pin, gpio.LOW)

    @add_api("photo", "Get Document Photo")
    def photo(self):
        """
        Takes a photograph using the document camera.  Returns
        the file name.
        """
        self._doc_light_on()
        tmpimg = tempfile.NamedTemporaryFile(suffix=".jpg", delete=False)
        tmpimg.close()

        # TODO: make more reliable
        # TODO: make resolution config variable
        # this is a dirty hack to keep the webcam system calls from hanging
        #cmd1 = "fswebcam --jpeg 95 --no-banner --resolution 320x240 /dev/null"
        #cmd2 = "fswebcam --jpeg 95 --no-banner --resolution 1920x1080 "
        #cmd2 += "-F 2 -S 1" + tmpimg.name
        #cmd1 = "uvccapture -d/dev/video1 -x320 -y240 -o /dev/null"
        #cmd2 = "/usr/local/bin/uvccapture -m -x3264 -y2448 -o" + tmpimg.name
        #subprocess.check_output(cmd1.split())
        modpath = os.path.dirname(__file__)
        mjpg = os.path.join(modpath, "..", "..", "lib", "mjpg-streamer",
                            "mjpg-streamer-experimental", "run.sh")
        mjpg_dir = os.path.dirname(mjpg)
        cmd = mjpg.split() + ["-i", "input_uvc.so -r 3264x2448 -n", "-o", "output_file.so -f /tmp/webcam -d 500 -s 2"]

        print(cmd)
        #proc = subprocess.Popen(cmd, shell=True, env={"LD_LIBRARY_PATH": mjpg_dir})
        proc = subprocess.Popen(cmd)
        time.sleep(2)
        killer_cmd = "killall -s SIGINT mjpg_streamer"
        subprocess.Popen(killer_cmd.split())
        time.sleep(2)

        # copy last image to the tmpfile
        filelist = os.listdir("/tmp/webcam")
        for i, f in enumerate(filelist):
            filelist[i] = os.path.join("/tmp/webcam", f)
        newest = max(filelist, key=lambda x: os.stat(x).st_mtime)
        print("copying ", newest, "to", tmpimg.name)
        shutil.copyfile(newest, tmpimg.name)

        # crop
        img = Image.open(tmpimg.name)
        img = img.transpose(Image.ROTATE_180)
        xsize, ysize = img.size

        #crop here to trim calibrated extra pixels
        loffset = int(round(xsize * (float(23) / 257)))
        roffset = xsize - int(round(xsize * (float(8) / 257)))
        box = (loffset, 0, roffset, ysize)
        img = img.crop(box)

        xsize, ysize = img.size
        if gpio.input(self.a4_pin) == 0:
            print("scanning as A4")
            offset = (xsize - ysize) / 2
            box = (offset, 0, (offset + ysize), xsize / 2)
            img = img.crop(box)
        elif gpio.input(self.a5_pin) == 0:
            print("scanning as A5")
            offset = xsize / 4
            box = (offset, 0, (offset + (xsize / 2)), ysize / 2)
            img = img.crop(box)
        elif gpio.input(self.a6_pin) == 0:
            print("scanning as A6")
            offset = (xsize - (ysize / 2)) / 2
            box = (offset, 0, (offset + (ysize / 2)), xsize / 4)
            img = img.crop(box)
        else:
            print("scanning as A3")

        # rotate
        if gpio.input(self.landscape_pin) == 0:
            img = img.transpose(Image.ROTATE_90)

        img.save(tmpimg.name)
        img.close()
        self._doc_light_off()
        return {"photo": tmpimg.name}


def main():
    px = Photography()
    px.run()


if __name__ == "__main__":
    main()