# Libreoffice-divvun: Linguistic extension for LibreOffice 
# Copyright (C) 2018 Kevin Brubeck Unhammer <unhammer@fsfe.org>
#
# This Source Code Form is subject to the terms of the Mozilla Public License,
# v. 2.0. If a copy of the MPL was not distributed with this file, You can
# obtain one at http://mozilla.org/MPL/2.0/.
#
# Alternatively, the contents of this file may be used under the terms of
# the GNU General Public License Version 3 or later (the "GPL"), in which
# case the provisions of the GPL are applicable instead of those above.

import os
import re
import uno 			# type:ignore
import sys
import platform
from ctypes import CDLL
import traceback
import logging
import unohelper 		# type:ignore
from com.sun.star.awt.MessageBoxType import ERRORBOX  # type:ignore
from com.sun.star.awt.MessageBoxButtons import BUTTONS_OK  # type:ignore

def messageBox(messageText):
	ctx = uno.getComponentContext()
	sManager = ctx.ServiceManager
	toolkit = sManager.createInstance("com.sun.star.awt.Toolkit")
	msgbox = toolkit.createMessageBox(None, ERRORBOX, BUTTONS_OK, "Error initializing Divvun", messageText)
	return msgbox.execute()


def platformSuffix():
	if os.name == "nt":
		logging.warn("Windows completely untested")
		return "dll"
	if sys.platform == "darwin":
		return "dylib"
	else:
		return "so"

def loadLibs():
	# This function has to be in a module (not lodivvun.py) to work
	dname = os.path.dirname(sys.modules[__name__].__file__)
	expectedSuffix = "pythonpath/LODivvun"
	if dname.endswith(expectedSuffix):
		dname = dname[:-len(expectedSuffix )]
	else:
		logging.warning("{} found in unexpected directory {}".format(__name__, dname))
	searchPath = os.path.join(dname,
				  "divvun",
				  platform.system() + "-" + "-".join(platform.architecture()))
	if not os.path.exists(searchPath):
		# TODO: Is this the best way to handle this?
		# We *do* want to show error messages if bundled libs couldn't be loaded when we are in a bundle, and vice versa system.
		logging.debug("C library search path {} does not exists, assuming we should use system libraries".format(searchPath))
		return
	else:
		logging.debug("Loading C libraries from search path {}".format(searchPath))
	# Keep libdivvun.so last, since it depends on the others:
	cnames = ["cg3", "archive", "hfst", "hfstospell", "divvun"]
	suffix = platformSuffix()
	clibs = {}
	loadingFailed = False
	for libname in cnames:
		matches = [f for f in os.listdir(searchPath)
			   if re.match('^lib{}([.][0-9]+)?[.]{}'.format(libname, suffix), f)]
		if matches == []:
			msg = "Couldn't find lib{}.{} in search path {}!".format(libname, suffix, searchPath)
			logging.warning(msg)
			if not loadingFailed:
				messageBox(msg)
			loadingFailed = True
			continue
		try:
			# Use the shortest match (ie. one with no version string if one exists)
			libbase = sorted(matches, key=len)[0]
			clibs[libname] = CDLL(os.path.join(searchPath, libbase))
		except OSError as e:
			msg = "OSError on loading C library {}: {}".format(libname, e)
			logging.warning(msg)
			if not loadingFailed:
				messageBox(msg)
			loadingFailed = True