#
# Copyright (C) 2012 David Raffensperger
#
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# to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, 
# and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 
# IN THE SOFTWARE.
#
#
#
#
# Program to Syncronize a local directory with an S3 directory/bucket
# David Raffensperger
# Created May 2011

# Part of it requires PyCrypto
# To install PyCrypto on Windows, go to: http://www.voidspace.org.uk/python/modules.shtml#pycrypto
# Ideas:
#	Run it every day but partition the files to upload many only once per month (would need to save date of last file,
#		   could hash names mod frequency)
#	Check the modified times for whole directories and traverse down to find the changed files - don't think that really works in Vista/NTFS
#	Compress large files
#	Try to optimize big files that change a lot into archived vs. current
#	Only upload files that have changed a lot (a big size change)
#	Ignore files over a certain size unless they are in a specified list
# 
# More ideas:
#	Make it not use os.walk, and make it use stat to do a walk, and get the modified times of files
#	Add better exception handling
#	 Use multi-delete S3 operation
#	 Have multiple TCP connections and upload multiple files at a time?
#	 Do disk operations in parallel with network operations?
#	Consider cases of files that get modified in the midst of running the script
#	Make it so that it doesn't need to store the local map, just process each local file as it goes
#	Make it update the cache file after every file is updated, or maybe every 10 or something, so that it can keep info if it crashes
#	Make a way to sort of uses a hybrid of getting server info and using local cache, so MD5's don't need to be corrected, but file can get back in sync.
#	Make a GUI with wxPython
#	Make it an Open Source project on SourceForge
#	Make it check that things were deleted and copied successfully
#	Work to have it have better error handling and check more things against S3 and with the local file system, make it more fault-tolerant
#	More advanced status stuff that shows total amount of stuff to upload

import sys
from pprint import pprint
from s3_helpers import *

def main(args):
	if len(args) < 4:
		log("Expected parametes: access_key [secret_key|decrypt:encypted_key|encrypt:secret_key] remote_bucket_and_prefix storage_class")
		exit(-1)
	
	access_key = args[0]
	secret_key = args[1]

	dec_prefix = 'decrypt:'
	enc_prefix = 'encrypt:'
	if secret_key.startswith(dec_prefix):
		log('Password to access AWS:')
		password = getpass('')			
		secret_key = decrypt_secret_key(password, secret_key[len(dec_prefix):])
	elif secret_key.startswith(enc_prefix):
		log('Password to encrypt AWS secret key:')
		password = getpass('')			
		secret_key = encrypt_secret_key(password, secret_key[len(enc_prefix):])
		log('Key Encrypted as: ' + secret_key)
		log('Run again with decrypt:[encrypted secret key (above)] to sync to S3.')
		exit(-1)

	bucket = args[2]
	storage_class = args[3]

	remote_map = get_remote_file_map(access_key, secret_key, bucket, "")
	
	file_objs = list(remote_map.by_path.values())
	
	for file_obj in file_objs:		
		if file_obj.storage_class != storage_class:
			path =  "/" + bucket + "/" + file_obj.path
		
			amz_headers = {}
			amz_headers['x-amz-copy-source'] = path
			amz_headers['x-amz-metadata-directive'] = 'COPY'
			amz_headers['x-amz-storage-class'] = storage_class			

			try:
				status = s3_operation(access_key, secret_key, "PUT", path, "", amz_headers)		
		
				if status == 200:				
					log("Changed to " + storage_class + " storage: " + str(path))
				else:
					log("Tried to change storage class of: " + str(path) + " but failed")
				
			except:
				log("Error changing storage class of: " + str(path) + " : " + str(sys.exc_info()[0]))	
		
	close_log_file()

if __name__ == "__main__":
	main(sys.argv[1:])