import os path import sys from StringIO import StringIO from datetime

import os.path
import sys
from StringIO import StringIO
from datetime import datetime, timedelta
import logging
try:
    import Image
except ImportError:
    from PIL import Image


def rawdata_from_image(img):
    """
    Convert PIL Image instance to raw data.
    """

    string = StringIO()
    img.save(string,format=img.format)
    return string.getvalue()


def image_from_rawdata(rawdata):
    """ 
    Convert raw data to PIL Image.
    """

    return Image.open(StringIO(rawdata))


def resize_image(width, height, image=None, rawdata=None):
    """ 
    Resize image to fit it into (width, height) box.

    If rawdata is not None than make image from it, process it
    and return rawdata.
    """

    if rawdata:
        image = image_from_rawdata(rawdata)
    try:
        image.thumbnail((width, height),resample=Image.ANTIALIAS)
    except Exception, err:
        logging.error(err)
        return None

    if rawdata:
        return rawdata_from_image(image)
    else:
        return image