#!/usr/local/bin/python

import math
import Image

import sys
from optparse import OptionParser


def main():
	usage = "usage: %prog [options] input"
	parser = OptionParser(usage)
	parser.add_option("-t", "--type",  dest="type", type="string",
		help="ipod type: 'video', 'photo', 'nano'", default='video')

	(options, args) = parser.parse_args()

	if len(args) == 0:
		parser.print_help()
		return()

	if len(args) != 1:
		parser.error("incorrect number of arguments")

	infile = args[0]

	res = 1920
	tilexres = 320
	tileyres = 240
	xtiles = 6

	if options.type == 'photo':
		res = 1100
		tilexres = 220
		tileyres = 176
		xtiles = 5
	if options.type == 'nano':
		res = 704
		tilexres = 176
		tileyres = 132
		xtiles = 4

	im = Image.open(infile)

	basename = infile.split('.')[0]

	newim = im.resize((res, im.size[1] * res / im.size[0]), Image.ANTIALIAS)

	ytiles = int(math.ceil(newim.size[1]/tileyres))

	l = "abcdefghijklmnopqrstuvwxyz"

	print "Making " + str(xtiles) + " x " + str(ytiles) + " tiles."
	for j in range(ytiles):
		for i in range(xtiles):
			x0 = i * tilexres
			y0 = j * tileyres
			tile = newim.crop((x0, y0, x0+tilexres, y0+tileyres))
			filename = basename + "_" + l[j] + "_" +str(i) + ".jpg"
			tile.save(filename)




if __name__ == "__main__":
	main()