#!python
#===============================================================================
# @filename    exif-renamer-1.0.py
# @author      Dylan Smith <dylansmith@gmail.com>
# @version     1.0
#
# DESCRIPTION:
# This script takes a single directory as an argument, and will attempt to
# rename all files in that direction based on the EXIF datestamp of the
# file. If EXIF data is not available, the script will use the filesystem
# ctime to generate the new filename.
#
# REQUIREMENTS:
# This script requires the EXIF.py library available at:
# http://sourceforge.net/projects/exif-py/
#
# USAGE:
# exif-renamer-1.0.py <absolute_or_relative_directory_path>
#===============================================================================

import EXIF
import sys
import os
import string
import datetime

## function definitions
#-------------------------------------------------------------------------------
def date_from_ctime(file):
   ctime = os.path.getctime(file.name);
   d = datetime.datetime.fromtimestamp(ctime)
   date = '%s:%s:%s %s:%s:%s' % (d.year, pad(d.month), pad(d.day), pad(d.hour), pad(d.minute), pad(d.second))
   return str(date)

def date_from_exif(file):
   data = EXIF.process_file(file, details=False, debug=False)
   if not data or not data.has_key('EXIF DateTimeDigitized'):
      return False
   else:
      return str(data['EXIF DateTimeDigitized'])

def format_exif_date(date):
   name = date.replace(':', '')
   name = name.replace(' ', '_')
   return name

def pad(n):
   return str(n).rjust(2,'0')

def rename_image(filename):
   if not valid_image(filename):
      return
   try:
      file = open(filename, 'rb')
   except:
      print "'%s': Cannot open for reading.\n" % filename
      return
   date = date_from_exif(file)
   op = '[EXIF] ';
   if (date == False):
      date = date_from_ctime(file)
      op = '[TIME] ';
   file.close()
   suffix = os.path.splitext(filename)[1]
   newname = format_exif_date(date) + string.lower(suffix)
   if os.path.exists(newname):
      print '[FAIL] ' + filename + ' already exists, ignoring...'
      return
   else:
      print op + filename + ' -> ' + newname
      os.rename(filename, newname)

def valid_image(filename):
   return string.lower(os.path.splitext(filename)[1]) in ['.jpg', '.jpeg', '.tiff']

## main loop
#-------------------------------------------------------------------------------
dir = sys.argv[1]
if not os.path.isdir(dir):
   print '"' + dir + '" is not a directory. Exiting...'
   exit()

os.chdir(dir)
files = os.listdir('.')
# confirm?
confirm = raw_input('Process ' + str(len(files)) + ' files in directory "' + dir + '"? [y/n]: ')
if string.lower(confirm) != 'y':
   print 'Exiting...'
   exit()

for filename in files:
   rename_image(filename)
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