# -*- tab-width: 4; indent-tabs-mode: nil; py-indent-offset: 4 -*-
#
# This file is part of the LibreOffice project.
#
# 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/.
#
# This file incorporates work covered by the following license notice:
#
#   Licensed to the Apache Software Foundation (ASF) under one or more
#   contributor license agreements. See the NOTICE file distributed
#   with this work for additional information regarding copyright
#   ownership. The ASF licenses this file to you under the Apache
#   License, Version 2.0 (the "License"); you may not use this file
#   except in compliance with the License. You may obtain a copy of
#   the License at http://www.apache.org/licenses/LICENSE-2.0 .
#
import uno
import unohelper
import sys
import types
import os
from urllib.parse import unquote
from com.sun.star.uno import Exception, RuntimeException
from com.sun.star.loader import XImplementationLoader
from com.sun.star.lang import XServiceInfo

MODULE_PROTOCOL = "vnd.openoffice.pymodule:"
DEBUG = 0

g_supportedServices = ("com.sun.star.loader.Python",)  # referenced by the native C++ loader !
g_implementationName = "org.openoffice.comp.pyuno.Loader"  # referenced by the native C++ loader !


def splitUrl(url):
    nColon = url.find(":")
    if -1 == nColon:
        raise RuntimeException("PythonLoader: No protocol in url " + url, None)
    return url[0:nColon], url[nColon + 1 : len(url)]


g_loadedComponents = {}


def checkForPythonPathBesideComponent(url):
    path = unohelper.fileUrlToSystemPath(url + "/pythonpath.zip")
    if DEBUG == 1:
        print(b"checking for existence of " + encfile(path))
    if 1 == os.access(encfile(path), os.F_OK) and path not in sys.path:
        if DEBUG == 1:
            print(b"adding " + encfile(path) + b" to sys.path")
        sys.path.append(path)

    path = unohelper.fileUrlToSystemPath(url + "/pythonpath")
    if 1 == os.access(encfile(path), os.F_OK) and path not in sys.path:
        if DEBUG == 1:
            print(b"adding " + encfile(path) + b" to sys.path")
        sys.path.append(path)


def encfile(uni):
    return uni.encode(sys.getfilesystemencoding())


class Loader(XImplementationLoader, XServiceInfo, unohelper.Base):
    def __init__(self, ctx):
        if DEBUG:
            print("pythonloader.Loader ctor")
        self.ctx = ctx

    def getModuleFromUrl(self, url):
        if DEBUG:
            print("pythonloader: interpreting url " + url)
        protocol, dependent = splitUrl(url)
        if "vnd.sun.star.expand" == protocol:
            exp = self.ctx.getValueByName("/singletons/com.sun.star.util.theMacroExpander")
            url = exp.expandMacros(unquote(dependent))
            protocol, dependent = splitUrl(url)

        if DEBUG:
            print("pythonloader: after expansion " + protocol + ":" + dependent)

        try:
            if "file" == protocol:
                # remove \..\ sequence, which may be useful e.g. in the build env
                url = unohelper.absolutize(url, url)

                # did we load the module already ?
                mod = g_loadedComponents.get(url)
                if not mod:
                    mod = types.ModuleType("uno_component")

                    # check for pythonpath.zip beside .py files
                    checkForPythonPathBesideComponent(url[0 : url.rfind("/")])

                    # read the file
                    filename = unohelper.fileUrlToSystemPath(url)

                    with open(filename, encoding="utf_8") as fileHandle:
                        src = fileHandle.read().replace("\r", "")
                        if not src.endswith("\n"):
                            src = src + "\n"

                        # compile and execute the module
                        codeobject = compile(src, encfile(filename), "exec")
                        mod.__file__ = filename
                        exec(codeobject, mod.__dict__)
                        g_loadedComponents[url] = mod
                return mod
            elif "vnd.openoffice.pymodule" == protocol:
                nSlash = dependent.rfind("/")
                if -1 != nSlash:
                    path = unohelper.fileUrlToSystemPath(dependent[0:nSlash])
                    dependent = dependent[nSlash + 1 : len(dependent)]
                    if path not in sys.path:
                        sys.path.append(path)
                mod = __import__(dependent)
                path_component, dot, rest = dependent.partition(".")
                while dot == ".":
                    path_component, dot, rest = rest.partition(".")
                    mod = getattr(mod, path_component)
                return mod
            else:
                if DEBUG:
                    print("Unknown protocol '" + protocol + "'")
                raise RuntimeException("PythonLoader: Unknown protocol " + protocol + " in url " + url, self)
        except Exception as e:
            if DEBUG:
                print("Python import exception " + str(type(e)) + " message " + str(e) + " args " + str(e.args))
            raise RuntimeException("Couldn't load " + url + " for reason " + str(e), None)
        return None

    def activate(self, implementationName, dummy, locationUrl, regKey):
        if DEBUG:
            print("pythonloader.Loader.activate")

        mod = self.getModuleFromUrl(locationUrl)
        implHelper = mod.__dict__.get("g_ImplementationHelper", None)
        if DEBUG:
            print("Fetched ImplHelper as " + str(implHelper))
        if implHelper is None:
            return mod.getComponentFactory(implementationName, self.ctx.ServiceManager, regKey)
        else:
            return implHelper.getComponentFactory(implementationName, regKey, self.ctx.ServiceManager)

    def writeRegistryInfo(self, regKey, dummy, locationUrl):
        if DEBUG:
            print("pythonloader.Loader.writeRegistryInfo")

        mod = self.getModuleFromUrl(locationUrl)
        implHelper = mod.__dict__.get("g_ImplementationHelper", None)
        if implHelper is None:
            return mod.writeRegistryInfo(self.ctx.ServiceManager, regKey)
        else:
            return implHelper.writeRegistryInfo(regKey, self.ctx.ServiceManager)

    def getImplementationName(self):
        return g_implementationName

    def supportsService(self, ServiceName):
        return ServiceName in self.getSupportedServiceNames()

    def getSupportedServiceNames(self):
        return g_supportedServices


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