'''
Recompress all jpg images in the current directory.
'''
import argparse
import io
import os
import PIL.ExifTags
import PIL.Image
import PIL.ImageFile
import string
import sys

from voussoirkit import bytestring

PIL.ImageFile.LOAD_TRUNCATED_IMAGES = True

for (ORIENTATION_KEY, val) in PIL.ExifTags.TAGS.items():
    if val == 'Orientation':
        break

def rejpg_argparse(args):
    if args.recurse:
        from voussoirkit import spinal
        walker = spinal.walk_generator()
        files = list(walker)
    else:
        from voussoirkit import pathclass
        files = pathclass.cwd().listdir()
        files = [f for f in files if f.is_file]

    files = [f for f in files if f.extension in ['.jpg', '.jpeg']]
    files = [f.absolute_path for f in files]

    bytes_saved = 0
    remaining_size = 0
    for filename in files:
        print(''.join(c for c in filename if c in string.printable))
        bytesio = io.BytesIO()
        i = PIL.Image.open(filename)
        exif = i._getexif()

        # Preserve orientation according to exif
        # Thank you Scabbiaza
        # https://stackoverflow.com/a/26928142
        if exif is None:
            pass
        elif exif[ORIENTATION_KEY] == 3:
            i = i.rotate(180, expand=True)
        elif exif[ORIENTATION_KEY] == 6:
            i = i.rotate(270, expand=True)
        elif exif[ORIENTATION_KEY] == 8:
            i = i.rotate(90, expand=True)

        i.save(bytesio, format='jpeg', quality=80)

        bytesio.seek(0)
        new_bytes = bytesio.read()
        old_size = os.path.getsize(filename)
        new_size = len(new_bytes)
        remaining_size += new_size
        if new_size < old_size:
            bytes_saved += (old_size - new_size)
            f = open(filename, 'wb')
            f.write(new_bytes)
            f.close()

    print('Saved', bytestring.bytestring(bytes_saved))
    print('Remaining are', bytestring.bytestring(remaining_size))

def main(argv):
    parser = argparse.ArgumentParser(description=__doc__)

    parser.add_argument('--recurse', dest='recurse', action='store_true')
    parser.set_defaults(func=rejpg_argparse)

    args = parser.parse_args(argv)
    return args.func(args)

if __name__ == '__main__':
    raise SystemExit(main(sys.argv[1:]))