# Copyright (c) 2021, Frappe Technologies Pvt. Ltd. and Contributors
# License: MIT. See LICENSE
"""
	frappe.translate
	~~~~~~~~~~~~~~~~

	Translation tools for frappe
"""

import io
import itertools
import json
import operator
import functools
import os
import re
from csv import reader
from typing import List, Union, Tuple

import frappe
from frappe.model.utils import InvalidIncludePath, render_include
from frappe.utils import get_bench_path, is_html, strip, strip_html_tags
from frappe.query_builder import Field, DocType
from pypika.terms import PseudoColumn


def get_language(lang_list: List = None) -> str:
	"""Set `frappe.local.lang` from HTTP headers at beginning of request

	Order of priority for setting language:
	1. Form Dict => _lang
	2. Cookie => preferred_language (Non authorized user)
	3. Request Header => Accept-Language (Non authorized user)
	4. User document => language
	5. System Settings => language
	"""
	is_logged_in = frappe.session.user != "Guest"

	# fetch language from form_dict
	if frappe.form_dict._lang:
		language = get_lang_code(
			frappe.form_dict._lang or get_parent_language(frappe.form_dict._lang)
		)
		if language:
			return language

	# use language set in User or System Settings if user is logged in
	if is_logged_in:
		return frappe.local.lang

	lang_set = set(lang_list or get_all_languages() or [])

	# fetch language from cookie
	preferred_language_cookie = get_preferred_language_cookie()

	if preferred_language_cookie:
		if preferred_language_cookie in lang_set:
			return preferred_language_cookie

		parent_language = get_parent_language(language)
		if parent_language in lang_set:
			return parent_language

	# fetch language from request headers
	accept_language = list(frappe.request.accept_languages.values())

	for language in accept_language:
		if language in lang_set:
			return language

		parent_language = get_parent_language(language)
		if parent_language in lang_set:
			return parent_language

	# fallback to language set in User or System Settings
	return frappe.local.lang


@functools.lru_cache()
def get_parent_language(lang: str) -> str:
	"""If the passed language is a variant, return its parent

	Eg:
		1. zh-TW -> zh
		2. sr-BA -> sr
	"""
	is_language_variant = "-" in lang
	if is_language_variant:
		return lang[:lang.index("-")]


def get_user_lang(user: str = None) -> str:
	"""Set frappe.local.lang from user preferences on session beginning or resumption"""
	user = user or frappe.session.user
	lang = frappe.cache().hget("lang", user)

	if not lang:
		# User.language => Session Defaults => frappe.local.lang => 'en'
		lang = (
			frappe.db.get_value("User", user, "language")
			or frappe.db.get_default("lang")
			or frappe.local.lang
			or "en"
		)

		frappe.cache().hset("lang", user, lang)

	return lang

def get_lang_code(lang: str) -> Union[str, None]:
	return (
		frappe.db.get_value("Language", {"name": lang})
		or frappe.db.get_value("Language", {"language_name": lang})
	)

def set_default_language(lang):
	"""Set Global default language"""
	if frappe.db.get_default("lang") != lang:
		frappe.db.set_default("lang", lang)
	frappe.local.lang = lang

def get_lang_dict():
	"""Returns all languages in dict format, full name is the key e.g. `{"english":"en"}`"""
	result = dict(frappe.get_all("Language", fields=["language_name", "name"], order_by="modified", as_list=True))
	return result

def get_dict(fortype, name=None):
	"""Returns translation dict for a type of object.

	 :param fortype: must be one of `doctype`, `page`, `report`, `include`, `jsfile`, `boot`
	 :param name: name of the document for which assets are to be returned.
	 """
	fortype = fortype.lower()
	cache = frappe.cache()
	asset_key = fortype + ":" + (name or "-")
	translation_assets = cache.hget("translation_assets", frappe.local.lang, shared=True) or {}

	if not asset_key in translation_assets:
		messages = []
		if fortype=="doctype":
			messages = get_messages_from_doctype(name)
		elif fortype=="page":
			messages = get_messages_from_page(name)
		elif fortype=="report":
			messages = get_messages_from_report(name)
		elif fortype=="include":
			messages = get_messages_from_include_files()
		elif fortype=="jsfile":
			messages = get_messages_from_file(name)
		elif fortype=="boot":
			apps = frappe.get_all_apps(True)
			for app in apps:
				messages.extend(get_server_messages(app))

			messages += get_messages_from_navbar()
			messages += get_messages_from_include_files()
			messages += (
				frappe.qb.from_("Print Format")
				.select(PseudoColumn("'Print Format:'"), "name")).run()
			messages += (
				frappe.qb.from_("DocType")
				.select(PseudoColumn("'DocType:'"), "name")).run()
			messages += (
				frappe.qb.from_("Role").select(PseudoColumn("'Role:'"), "name").run()
			)
			messages += (
				frappe.qb.from_("Module Def")
				.select(PseudoColumn("'Module:'"), "name")).run()
			messages += (
				frappe.qb.from_("Workspace Shortcut")
				.where(Field("format").isnotnull())
				.select(PseudoColumn("''"), "format")).run()
			messages += (
				frappe.qb.from_("Onboarding Step")
				.select(PseudoColumn("''"), "title")).run()

		messages = deduplicate_messages(messages)
		message_dict = make_dict_from_messages(messages, load_user_translation=False)
		message_dict.update(get_dict_from_hooks(fortype, name))
		# remove untranslated
		message_dict = {k: v for k, v in message_dict.items() if k!=v}
		translation_assets[asset_key] = message_dict
		cache.hset("translation_assets", frappe.local.lang, translation_assets, shared=True)

	translation_map = translation_assets[asset_key]

	translation_map.update(get_user_translations(frappe.local.lang))

	return translation_map


def get_dict_from_hooks(fortype, name):
	translated_dict = {}

	hooks = frappe.get_hooks("get_translated_dict")
	for (hook_fortype, fortype_name) in hooks:
		if hook_fortype == fortype and fortype_name == name:
			for method in hooks[(hook_fortype, fortype_name)]:
				translated_dict.update(frappe.get_attr(method)())

	return translated_dict

def make_dict_from_messages(messages, full_dict=None, load_user_translation=True):
	"""Returns translated messages as a dict in Language specified in `frappe.local.lang`

	:param messages: List of untranslated messages
	"""
	out = {}
	if full_dict==None:
		if load_user_translation:
			full_dict = get_full_dict(frappe.local.lang)
		else:
			full_dict = load_lang(frappe.local.lang)

	for m in messages:
		if m[1] in full_dict:
			out[m[1]] = full_dict[m[1]]
		# check if msg with context as key exist eg. msg:context
		if len(m) > 2 and m[2]:
			key = m[1] + ':' + m[2]
			if full_dict.get(key):
				out[key] = full_dict[key]

	return out

def get_lang_js(fortype, name):
	"""Returns code snippet to be appended at the end of a JS script.

	:param fortype: Type of object, e.g. `DocType`
	:param name: Document name
	"""
	return "\n\n$.extend(frappe._messages, %s)" % json.dumps(get_dict(fortype, name))

def get_full_dict(lang):
	"""Load and return the entire translations dictionary for a language from :meth:`frape.cache`

	:param lang: Language Code, e.g. `hi`
	"""
	if not lang:
		return {}

	# found in local, return!
	if getattr(frappe.local, 'lang_full_dict', None) and frappe.local.lang_full_dict.get(lang, None):
		return frappe.local.lang_full_dict

	frappe.local.lang_full_dict = load_lang(lang)

	try:
		# get user specific translation data
		user_translations = get_user_translations(lang)
		frappe.local.lang_full_dict.update(user_translations)
	except Exception:
		pass

	return frappe.local.lang_full_dict

def load_lang(lang, apps=None):
	"""Combine all translations from `.csv` files in all `apps`.
	For derivative languages (es-GT), take translations from the
	base language (es) and then update translations from the child (es-GT)"""

	if lang=='en':
		return {}

	out = frappe.cache().hget("lang_full_dict", lang, shared=True)
	if not out:
		out = {}
		for app in (apps or frappe.get_all_apps(True)):
			path = os.path.join(frappe.get_pymodule_path(app), "translations", lang + ".csv")
			out.update(get_translation_dict_from_file(path, lang, app) or {})

		if '-' in lang:
			parent = lang.split('-')[0]
			parent_out = load_lang(parent)
			parent_out.update(out)
			out = parent_out

		frappe.cache().hset("lang_full_dict", lang, out, shared=True)

	return out or {}

def get_translation_dict_from_file(path, lang, app):
	"""load translation dict from given path"""
	translation_map = {}
	if os.path.exists(path):
		csv_content = read_csv_file(path)

		for item in csv_content:
			if len(item)==3 and item[2]:
				key = item[0] + ':' + item[2]
				translation_map[key] = strip(item[1])
			elif len(item) in [2, 3]:
				translation_map[item[0]] = strip(item[1])
			elif item:
				raise Exception("Bad translation in '{app}' for language '{lang}': {values}".format(
					app=app, lang=lang, values=repr(item).encode("utf-8")
				))

	return translation_map

def get_user_translations(lang):
	if not frappe.db:
		frappe.connect()
	out = frappe.cache().hget('lang_user_translations', lang)
	if out is None:
		out = {}
		user_translations = frappe.get_all('Translation',
			fields=["source_text", "translated_text", "context"],
			filters={'language': lang})

		for translation in user_translations:
			key = translation.source_text
			value = translation.translated_text
			if translation.context:
				key += ':' + translation.context
			out[key] = value

		frappe.cache().hset('lang_user_translations', lang, out)

	return out


def clear_cache():
	"""Clear all translation assets from :meth:`frappe.cache`"""
	cache = frappe.cache()
	cache.delete_key("langinfo")

	# clear translations saved in boot cache
	cache.delete_key("bootinfo")
	cache.delete_key("lang_full_dict", shared=True)
	cache.delete_key("translation_assets", shared=True)
	cache.delete_key("lang_user_translations")

def get_messages_for_app(app, deduplicate=True):
	"""Returns all messages (list) for a specified `app`"""
	messages = []
	modules = [frappe.unscrub(m) for m in frappe.local.app_modules[app]]

	# doctypes
	if modules:
		if isinstance(modules, str):
			modules = [modules]
		filtered_doctypes = frappe.qb.from_("DocType").where(
			Field("module").isin(modules)
		).select("name").run(pluck=True)
		for name in filtered_doctypes:
			messages.extend(get_messages_from_doctype(name))

		# pages
		filtered_pages = frappe.qb.from_("Page").where(
			Field("module").isin(modules)
		).select("name", "title").run()
		for name, title in filtered_pages:
			messages.append((None, title or name))
			messages.extend(get_messages_from_page(name))


		# reports
		report = DocType("Report")
		doctype = DocType("DocType")
		names = (
			frappe.qb.from_(doctype)
			.from_(report)
			.where((report.ref_doctype == doctype.name) & doctype.module.isin(modules))
			.select(report.name).run(pluck=True))
		for name in names:
			messages.append((None, name))
			messages.extend(get_messages_from_report(name))
			for i in messages:
				if not isinstance(i, tuple):
					raise Exception

	# workflow based on app.hooks.fixtures
	messages.extend(get_messages_from_workflow(app_name=app))

	# custom fields based on app.hooks.fixtures
	messages.extend(get_messages_from_custom_fields(app_name=app))

	# app_include_files
	messages.extend(get_all_messages_from_js_files(app))

	# server_messages
	messages.extend(get_server_messages(app))

	# messages from navbar settings
	messages.extend(get_messages_from_navbar())

	if deduplicate:
		messages = deduplicate_messages(messages)

	return messages


def get_messages_from_navbar():
	"""Return all labels from Navbar Items, as specified in Navbar Settings."""
	labels = frappe.get_all('Navbar Item', filters={'item_label': ('is', 'set')}, pluck='item_label')
	return [('Navbar:', label, 'Label of a Navbar Item') for label in labels]


def get_messages_from_doctype(name):
	"""Extract all translatable messages for a doctype. Includes labels, Python code,
	Javascript code, html templates"""
	messages = []
	meta = frappe.get_meta(name)

	messages = [meta.name, meta.module]

	if meta.description:
		messages.append(meta.description)

	# translations of field labels, description and options
	for d in meta.get("fields"):
		messages.extend([d.label, d.description])

		if d.fieldtype=='Select' and d.options:
			options = d.options.split('\n')
			if not "icon" in options[0]:
				messages.extend(options)
		if d.fieldtype=='HTML' and d.options:
			messages.append(d.options)

	# translations of roles
	for d in meta.get("permissions"):
		if d.role:
			messages.append(d.role)

	messages = [message for message in messages if message]
	messages = [('DocType: ' + name, message) for message in messages if is_translatable(message)]

	# extract from js, py files
	if not meta.custom:
		doctype_file_path = frappe.get_module_path(meta.module, "doctype", meta.name, meta.name)
		messages.extend(get_messages_from_file(doctype_file_path + ".js"))
		messages.extend(get_messages_from_file(doctype_file_path + "_list.js"))
		messages.extend(get_messages_from_file(doctype_file_path + "_list.html"))
		messages.extend(get_messages_from_file(doctype_file_path + "_calendar.js"))
		messages.extend(get_messages_from_file(doctype_file_path + "_dashboard.html"))

	# workflow based on doctype
	messages.extend(get_messages_from_workflow(doctype=name))
	return messages

def get_messages_from_workflow(doctype=None, app_name=None):
	assert doctype or app_name, 'doctype or app_name should be provided'

	# translations for Workflows
	workflows = []
	if doctype:
		workflows = frappe.get_all('Workflow', filters={'document_type': doctype})
	else:
		fixtures = frappe.get_hooks('fixtures', app_name=app_name) or []
		for fixture in fixtures:
			if isinstance(fixture, str) and fixture == 'Worflow':
				workflows = frappe.get_all('Workflow')
				break
			elif isinstance(fixture, dict) and fixture.get('dt', fixture.get('doctype')) == 'Workflow':
				workflows.extend(frappe.get_all('Workflow', filters=fixture.get('filters')))

	messages  = []
	document_state = DocType("Workflow Document State")
	for w in workflows:
		states = frappe.db.get_values(
			document_state,
			filters=document_state.parent == w["name"],
			fieldname="state",
			distinct=True,
			as_dict=True,
			order_by=None,
		)
		messages.extend([('Workflow: ' + w['name'], state['state']) for state in states if is_translatable(state['state'])])
		states = frappe.db.get_values(
			document_state,
			filters=(document_state.parent == w["name"])
			& (document_state.message.isnotnull()),
			fieldname="message",
			distinct=True,
			order_by=None,
			as_dict=True,
		)
		messages.extend([("Workflow: " + w['name'], state['message'])
			for state in states if is_translatable(state['message'])])

		actions = frappe.db.get_values(
			"Workflow Transition",
			filters={"parent": w["name"]},
			fieldname="action",
			as_dict=True,
			distinct=True,
			order_by=None,
		)

		messages.extend([("Workflow: " + w['name'], action['action']) \
			for action in actions if is_translatable(action['action'])])

	return messages


def get_messages_from_custom_fields(app_name):
	fixtures = frappe.get_hooks('fixtures', app_name=app_name) or []
	custom_fields = []

	for fixture in fixtures:
		if isinstance(fixture, str) and fixture == 'Custom Field':
			custom_fields = frappe.get_all('Custom Field', fields=['name','label', 'description', 'fieldtype', 'options'])
			break
		elif isinstance(fixture, dict) and fixture.get('dt', fixture.get('doctype')) == 'Custom Field':
			custom_fields.extend(frappe.get_all('Custom Field', filters=fixture.get('filters'),
				fields=['name','label', 'description', 'fieldtype', 'options']))

	messages = []
	for cf in custom_fields:
		for prop in ('label', 'description'):
			if not cf.get(prop) or not is_translatable(cf[prop]):
				continue
			messages.append(('Custom Field - {}: {}'.format(prop, cf['name']), cf[prop]))
		if cf['fieldtype'] == 'Selection' and cf.get('options'):
			for option in cf['options'].split('\n'):
				if option and 'icon' not in option and is_translatable(option):
					messages.append(('Custom Field - Description: ' + cf['name'], option))

	return messages

def get_messages_from_page(name):
	"""Returns all translatable strings from a :class:`frappe.core.doctype.Page`"""
	return _get_messages_from_page_or_report("Page", name)

def get_messages_from_report(name):
	"""Returns all translatable strings from a :class:`frappe.core.doctype.Report`"""
	report = frappe.get_doc("Report", name)
	messages = _get_messages_from_page_or_report("Report", name,
		frappe.db.get_value("DocType", report.ref_doctype, "module"))

	if report.columns:
		context = "Column of report '%s'" % report.name # context has to match context in `prepare_columns` in query_report.js
		messages.extend([(None, report_column.label, context) for report_column in report.columns])

	if report.filters:
		messages.extend([(None, report_filter.label) for report_filter in report.filters])

	if report.query:
		messages.extend([(None, message) for message in re.findall('"([^:,^"]*):', report.query) if is_translatable(message)])

	messages.append((None,report.report_name))
	return messages

def _get_messages_from_page_or_report(doctype, name, module=None):
	if not module:
		module = frappe.db.get_value(doctype, name, "module")

	doc_path = frappe.get_module_path(module, doctype, name)

	messages = get_messages_from_file(os.path.join(doc_path, frappe.scrub(name) +".py"))

	if os.path.exists(doc_path):
		for filename in os.listdir(doc_path):
			if filename.endswith(".js") or filename.endswith(".html"):
				messages += get_messages_from_file(os.path.join(doc_path, filename))

	return messages

def get_server_messages(app):
	"""Extracts all translatable strings (tagged with :func:`frappe._`) from Python modules
		inside an app"""
	messages = []
	file_extensions = ('.py', '.html', '.js', '.vue')
	for basepath, folders, files in os.walk(frappe.get_pymodule_path(app)):
		for dontwalk in (".git", "public", "locale"):
			if dontwalk in folders: folders.remove(dontwalk)

		for f in files:
			f = frappe.as_unicode(f)
			if f.endswith(file_extensions):
				messages.extend(get_messages_from_file(os.path.join(basepath, f)))

	return messages

def get_messages_from_include_files(app_name=None):
	"""Returns messages from js files included at time of boot like desk.min.js for desk and web"""
	messages = []
	app_include_js = frappe.get_hooks("app_include_js", app_name=app_name) or []
	web_include_js = frappe.get_hooks("web_include_js", app_name=app_name) or []
	include_js = app_include_js + web_include_js

	for js_path in include_js:
		relative_path = os.path.join(frappe.local.sites_path, js_path.lstrip('/'))
		messages_from_file = get_messages_from_file(relative_path)
		messages.extend(messages_from_file)

	return messages

def get_all_messages_from_js_files(app_name=None):
	"""Extracts all translatable strings from app `.js` files"""
	messages = []
	for app in ([app_name] if app_name else frappe.get_installed_apps()):
		if os.path.exists(frappe.get_app_path(app, "public")):
			for basepath, folders, files in os.walk(frappe.get_app_path(app, "public")):
				if "frappe/public/js/lib" in basepath:
					continue

				for fname in files:
					if fname.endswith(".js") or fname.endswith(".html") or fname.endswith('.vue'):
						messages.extend(get_messages_from_file(os.path.join(basepath, fname)))

	return messages

def get_messages_from_file(path: str) -> List[Tuple[str, str, str, str]]:
	"""Returns a list of transatable strings from a code file

	:param path: path of the code file
	"""
	frappe.flags.setdefault('scanned_files', [])
	# TODO: Find better alternative
	# To avoid duplicate scan
	if path in set(frappe.flags.scanned_files):
		return []

	frappe.flags.scanned_files.append(path)

	bench_path = get_bench_path()
	if os.path.exists(path):
		with open(path, 'r') as sourcefile:
			try:
				file_contents = sourcefile.read()
			except Exception:
				print("Could not scan file for translation: {0}".format(path))
				return []

			return [
				(os.path.relpath(path, bench_path), message, context, line)
				for (line, message, context) in extract_messages_from_code(file_contents)
			]
	else:
		return []

def extract_messages_from_code(code):
	"""
		Extracts translatable strings from a code file
		:param code: code from which translatable files are to be extracted
		:param is_py: include messages in triple quotes e.g. `_('''message''')`
	"""
	from jinja2 import TemplateError

	try:
		code = frappe.as_unicode(render_include(code))

	# Exception will occur when it encounters John Resig's microtemplating code
	except (TemplateError, ImportError, InvalidIncludePath, IOError) as e:
		if isinstance(e, InvalidIncludePath):
			frappe.clear_last_message()

		pass

	messages = []
	pattern = r"_\(([\"']{,3})(?P<message>((?!\1).)*)\1(\s*,\s*context\s*=\s*([\"'])(?P<py_context>((?!\5).)*)\5)*(\s*,\s*(.)*?\s*(,\s*([\"'])(?P<js_context>((?!\11).)*)\11)*)*\)"

	for m in re.compile(pattern).finditer(code):
		message = m.group('message')
		context = m.group('py_context') or m.group('js_context')
		pos = m.start()

		if is_translatable(message):
			messages.append([pos, message, context])

	return add_line_number(messages, code)

def is_translatable(m):
	if re.search("[a-zA-Z]", m) and not m.startswith("fa fa-") and not m.endswith("px") and not m.startswith("eval:"):
		return True
	return False

def add_line_number(messages, code):
	ret = []
	messages = sorted(messages, key=lambda x: x[0])
	newlines = [m.start() for m in re.compile(r'\n').finditer(code)]
	line = 1
	newline_i = 0
	for pos, message, context in messages:
		while newline_i < len(newlines) and pos > newlines[newline_i]:
			line+=1
			newline_i+= 1
		ret.append([line, message, context])
	return ret

def read_csv_file(path):
	"""Read CSV file and return as list of list

	:param path: File path"""

	with io.open(path, mode='r', encoding='utf-8', newline='') as msgfile:
		data = reader(msgfile)
		newdata = [[val for val in row] for row in data]

	return newdata

def write_csv_file(path, app_messages, lang_dict):
	"""Write translation CSV file.

	:param path: File path, usually `[app]/translations`.
	:param app_messages: Translatable strings for this app.
	:param lang_dict: Full translated dict.
	"""
	app_messages.sort(key = lambda x: x[1])
	from csv import writer
	with open(path, 'w', newline='') as msgfile:
		w = writer(msgfile, lineterminator='\n')

		for app_message in app_messages:
			context = None
			if len(app_message) == 2:
				path, message = app_message
			elif len(app_message) == 3:
				path, message, lineno = app_message
			elif len(app_message) == 4:
				path, message, context, lineno = app_message
			else:
				continue

			t = lang_dict.get(message, '')
			# strip whitespaces
			translated_string = re.sub(r'{\s?([0-9]+)\s?}', r"{\g<1>}", t)
			if translated_string:
				w.writerow([message, translated_string, context])

def get_untranslated(lang, untranslated_file, get_all=False):
	"""Returns all untranslated strings for a language and writes in a file

	:param lang: Language code.
	:param untranslated_file: Output file path.
	:param get_all: Return all strings, translated or not."""
	clear_cache()
	apps = frappe.get_all_apps(True)

	messages = []
	untranslated = []
	for app in apps:
		messages.extend(get_messages_for_app(app))

	messages = deduplicate_messages(messages)

	def escape_newlines(s):
		return (s.replace("\\\n", "|||||")
				.replace("\\n", "||||")
				.replace("\n", "|||"))

	if get_all:
		print(str(len(messages)) + " messages")
		with open(untranslated_file, "wb") as f:
			for m in messages:
				# replace \n with ||| so that internal linebreaks don't get split
				f.write((escape_newlines(m[1]) + os.linesep).encode("utf-8"))
	else:
		full_dict = get_full_dict(lang)

		for m in messages:
			if not full_dict.get(m[1]):
				untranslated.append(m[1])

		if untranslated:
			print(str(len(untranslated)) + " missing translations of " + str(len(messages)))
			with open(untranslated_file, "wb") as f:
				for m in untranslated:
					# replace \n with ||| so that internal linebreaks don't get split
					f.write((escape_newlines(m) + os.linesep).encode("utf-8"))
		else:
			print("all translated!")

def update_translations(lang, untranslated_file, translated_file):
	"""Update translations from a source and target file for a given language.

	:param lang: Language code (e.g. `en`).
	:param untranslated_file: File path with the messages in English.
	:param translated_file: File path with messages in language to be updated."""
	clear_cache()
	full_dict = get_full_dict(lang)

	def restore_newlines(s):
		return (s.replace("|||||", "\\\n")
				.replace("| | | | |", "\\\n")
				.replace("||||", "\\n")
				.replace("| | | |", "\\n")
				.replace("|||", "\n")
				.replace("| | |", "\n"))

	translation_dict = {}
	for key, value in zip(frappe.get_file_items(untranslated_file, ignore_empty_lines=False),
		frappe.get_file_items(translated_file, ignore_empty_lines=False)):

		# undo hack in get_untranslated
		translation_dict[restore_newlines(key)] = restore_newlines(value)

	full_dict.update(translation_dict)

	for app in frappe.get_all_apps(True):
		write_translations_file(app, lang, full_dict)

def import_translations(lang, path):
	"""Import translations from file in standard format"""
	clear_cache()
	full_dict = get_full_dict(lang)
	full_dict.update(get_translation_dict_from_file(path, lang, 'import'))

	for app in frappe.get_all_apps(True):
		write_translations_file(app, lang, full_dict)


def rebuild_all_translation_files():
	"""Rebuild all translation files: `[app]/translations/[lang].csv`."""
	for lang in get_all_languages():
		for app in frappe.get_all_apps():
			write_translations_file(app, lang)

def write_translations_file(app, lang, full_dict=None, app_messages=None):
	"""Write a translation file for a given language.

	:param app: `app` for which translations are to be written.
	:param lang: Language code.
	:param full_dict: Full translated language dict (optional).
	:param app_messages: Source strings (optional).
	"""
	if not app_messages:
		app_messages = get_messages_for_app(app)

	if not app_messages:
		return

	tpath = frappe.get_pymodule_path(app, "translations")
	frappe.create_folder(tpath)
	write_csv_file(os.path.join(tpath, lang + ".csv"),
		app_messages, full_dict or get_full_dict(lang))

def send_translations(translation_dict):
	"""Append translated dict in `frappe.local.response`"""
	if "__messages" not in frappe.local.response:
		frappe.local.response["__messages"] = {}

	frappe.local.response["__messages"].update(translation_dict)

def deduplicate_messages(messages):
	ret = []
	op = operator.itemgetter(1)
	messages = sorted(messages, key=op)
	for k, g in itertools.groupby(messages, op):
		ret.append(next(g))
	return ret

def rename_language(old_name, new_name):
	if not frappe.db.exists('Language', new_name):
		return

	language_in_system_settings = frappe.db.get_single_value("System Settings", "language")
	if language_in_system_settings == old_name:
		frappe.db.set_value("System Settings", "System Settings", "language", new_name)

	frappe.db.sql("""update `tabUser` set language=%(new_name)s where language=%(old_name)s""",
		{ "old_name": old_name, "new_name": new_name })

@frappe.whitelist()
def update_translations_for_source(source=None, translation_dict=None):
	if not (source and translation_dict):
		return

	translation_dict = json.loads(translation_dict)

	if is_html(source):
		source = strip_html_tags(source)

	# for existing records
	translation_records = frappe.db.get_values('Translation', {
		'source_text': source
	}, ['name', 'language'],  as_dict=1)
	for d in translation_records:
		if translation_dict.get(d.language, None):
			doc = frappe.get_doc('Translation', d.name)
			doc.translated_text = translation_dict.get(d.language)
			doc.save()
			# done with this lang value
			translation_dict.pop(d.language)
		else:
			frappe.delete_doc('Translation', d.name)

	# remaining values are to be inserted
	for lang, translated_text in translation_dict.items():
		doc = frappe.new_doc('Translation')
		doc.language = lang
		doc.source_text = source
		doc.translated_text = translated_text
		doc.save()

	return translation_records

@frappe.whitelist()
def get_translations(source_text):
	if is_html(source_text):
		source_text = strip_html_tags(source_text)

	return frappe.db.get_list('Translation',
		fields = ['name', 'language', 'translated_text as translation'],
		filters = {
			'source_text': source_text
		}
	)

@frappe.whitelist()
def get_messages(language, start=0, page_length=100, search_text=''):
	from frappe.frappeclient import FrappeClient
	translator = FrappeClient(get_translator_url())
	translated_dict = translator.post_api('translator.api.get_strings_for_translation', params=locals())

	return translated_dict


@frappe.whitelist()
def get_source_additional_info(source, language=''):
	from frappe.frappeclient import FrappeClient
	translator = FrappeClient(get_translator_url())
	return translator.post_api('translator.api.get_source_additional_info', params=locals())

@frappe.whitelist()
def get_contributions(language):
	return frappe.get_all('Translation', fields=['*'], filters={
		'contributed': 1,
	})

@frappe.whitelist()
def get_contribution_status(message_id):
	from frappe.frappeclient import FrappeClient
	doc = frappe.get_doc('Translation', message_id)
	translator = FrappeClient(get_translator_url())
	contributed_translation = translator.get_api('translator.api.get_contribution_status', params={
		'translation_id': doc.contribution_docname
	})
	return contributed_translation

def get_translator_url():
	return frappe.get_hooks()['translator_url'][0]

@frappe.whitelist(allow_guest=True)
def get_all_languages(with_language_name=False):
	"""Returns all language codes ar, ch etc"""
	def get_language_codes():
		return frappe.get_all("Language", pluck="name")

	def get_all_language_with_name():
		return frappe.db.get_all('Language', ['language_code', 'language_name'])

	if not frappe.db:
		frappe.connect()

	if with_language_name:
		return frappe.cache().get_value('languages_with_name', get_all_language_with_name)
	else:
		return frappe.cache().get_value('languages', get_language_codes)

@frappe.whitelist(allow_guest=True)
def set_preferred_language_cookie(preferred_language):
	frappe.local.cookie_manager.set_cookie("preferred_language", preferred_language)

def get_preferred_language_cookie():
	return frappe.request.cookies.get("preferred_language")