#!/usr/bin/python

import os
import sys
import getopt
import subprocess
import socket
import tempfile
import yaml

config_path = os.path.expanduser("~")+"/.config/data-sync.yaml"

text_red = '\033[31m'
text_blue = '\033[34m'
text_green = '\033[32m'
text_cyan = '\033[36m'
text_bold = '\033[1m'
text_reset = '\033[0m'

class data_sync():
	hosts = []
	diff = False
	merge = False

	# config

	def config_load(self):
		s = open(config_path, "r")
		y = yaml.load(s, Loader = yaml.SafeLoader)
		s.close()

		self.hostname = socket.gethostname()
		self.hosts = y["hosts"]

	# hosts

	def host_find(self, name):
		for host in self.hosts:
			if host["name"] == name:
				return host

		return None

	def host_target_check(self, host, target):
		if "targets" not in host:
			return False

		for entry in host["targets"]:
			if entry["label"] == target:
				return True

		return False

	# excludes

	def excludes_prepare(self, entry):
		if "excludes" not in entry:
			return None

		fd, path = tempfile.mkstemp()

		s = os.fdopen(fd, 'w')

		for exclude in entry["excludes"]:
			s.write(entry["path"]+exclude+"\n")

		return path

	def excludes_cleanup(self, excludes_path):
		os.unlink(excludes_path)

	# rsync

	def rsync_address(self, host, path):
		if host["name"] == self.hostname or ("location" in host and host["location"] == "local"):
			return path
		else:
			address = ""

			if "user" in host:
				address += host["user"]+"@"

			if "address" in host:
				address += host["address"]
			else:
				address += host["name"]

			address += ":" + path

			return address

	def rsync_command(self, source, source_path, sink, sink_path, excludes_path):
		rsync_command = [ "rsync", "-a", "-s", "--progress" ]

		if not self.merge:
			rsync_command += [ "--delete" ]

		if self.diff:
			rsync_command += [ "--dry-run" ]

		if excludes_path:
			rsync_command += [ "--exclude-from="+excludes_path ]

		rsync_command += [ self.rsync_address(source, source_path) ]
		rsync_command += [ self.rsync_address(sink, sink_path) ]

		return rsync_command

	# sync

	def sync_target(self, source, sink, target):
		print("Sync target "+target+" between "+source["name"]+" and "+sink["name"])

	def sync_targets(self, source, sink, targets):
		targets_list = []

		for target in targets:
			if self.host_target_check(source, target) and self.host_target_check(sink, target):
				targets_list.append(target)

		if len(targets_list) == 0:
			return 1

		for target in targets_list:
			self.sync_target(source, sink, target)

		return 0

	def sync_data_entry(self, source, sink, sync_host, entry):
		print("\nSync "+text_green+text_bold+entry["path"]+text_reset+" from "+text_cyan+source["name"]+text_reset+" to "+text_cyan+sink["name"]+text_reset+" started")

		if "base" in entry:
			base = entry["base"]
		else:
			base = source["base"]

		source_path = os.path.join(base, entry["path"])
		sink_path = os.path.join(sink["base"], sync_host["path"]) + "/"

		excludes_path = self.excludes_prepare(entry)

		command = self.rsync_command(source, source_path, sink, sink_path, excludes_path)
		subprocess.call(command)

		if excludes_path:
			self.excludes_cleanup(excludes_path)

		print("\nSync "+text_green+text_bold+entry["path"]+text_reset+" from "+text_cyan+source["name"]+text_reset+" to "+text_cyan+sink["name"]+text_reset+" finished")

	def sync_data(self, source, sink, targets):
		found = False

		print("Sync data from "+text_cyan+text_bold+source["name"]+text_reset+" to "+text_cyan+text_bold+sink["name"]+text_reset)

		sync_host = None

		if "sync-hosts" not in sink:
			return 1

		for entry in sink["sync-hosts"]:
			if entry["name"] == source["name"]:
				sync_host = entry

		if sync_host is None:
			print(sink["name"]+" is not a sync host for "+source["name"])

		if "data" not in source:
			return 1

		for entry in source["data"]:
			if len(targets) > 0 and entry["path"] not in targets:
				continue

			self.sync_data_entry(source, sink, sync_host, entry)
			found = True

		if not found:
			return 1

		return 0

	def main(self):
		global config_path

		opts, args = getopt.getopt(sys.argv[1:], "mdc:")

		for key, value in opts:
			if key == "-m":
				self.merge = True
			elif key == "-d":
				self.diff = True
			elif key == "-c":
				config_path = value

		if len(args) < 2:
			return 1

		source_name = args[0]
		sink_name = args[1]

		targets = args[2:]

		self.config_load()

		source = self.host_find(source_name)
		if source is None:
			print("Unknown source host: "+source_name)
			return 1

		sink = self.host_find(sink_name)
		if sink is None:
			print("Unknown sink host: "+sink_name)
			return 1

		if len(targets) == 0:
			return self.sync_data(source, sink, targets)

		ret = self.sync_targets(source, sink, targets)
		if ret != 0:
			ret = self.sync_data(source, sink, targets)

		if ret != 0:
			print("No common target or data to sync")

		return ret

if __name__ == "__main__":
	sys.exit(data_sync().main())