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# Copyright (C) 2009, Tutorius.org
# Copyright (C) 2009, Jean-Christophe Savard <savard.jean.christophe@gmail.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA


"""
This module contains all the data handling class of Tutorius  
"""

import logging
import os
import shutil
import tempfile
import uuid
import xml.dom.minidom
from xml.dom import NotFoundErr
import zipfile
from ConfigParser import SafeConfigParser

from . import addon
from .tutorial import Tutorial, State, AutomaticTransitionEvent
from localization import LocalizationHelper

logger = logging.getLogger("tutorius")

# this is where user installed/generated tutorials will go
def _get_store_root():
    profile_name = os.getenv("SUGAR_PROFILE") or "default"
    return os.path.join(os.getenv("HOME"),
                        ".sugar",profile_name,"tutorius","data")
# this is where activity bundled tutorials should be, under the activity bundle
def _get_bundle_root():
    """
    Return the path of the bundled activity, or None if not applicable.
    """
    if os.getenv("SUGAR_BUNDLE_PATH") != None:
        return os.path.join(os.getenv("SUGAR_BUNDLE_PATH"),"data","tutorius","data")
    else:
        return None

INI_ACTIVITY_SECTION = "RELATED_ACTIVITIES"
INI_METADATA_SECTION = "GENERAL_METADATA"
INI_GUID_PROPERTY = "guid"
INI_NAME_PROPERTY = "name"
INI_XML_FSM_PROPERTY = "fsm_filename"
INI_VERSION_PROPERTY = 'version'
INI_CATEGORY_PROPERTY = 'category'
INI_FILENAME = "meta.ini"
TUTORIAL_FILENAME = "tutorial.xml"
RESOURCES_FOLDER = 'resources'
LOCALIZATION_FOLDER = 'localization'

######################################################################
# XML Tag names and attributes
######################################################################
ELEM_FSM = "FSM"
ELEM_STATES = "States"
ELEM_STATE = "State"
ELEM_ACTIONS = "Actions"
ELEM_TRANS = "Transitions"
ELEM_AUTOTRANS = "AutomaticTransition"
NODE_COMPONENT = "Component"
NODE_SUBCOMPONENT = "property"
NODE_SUBCOMPONENTLIST = "listproperty"
NAME_ATTR = "__name__"
NEXT_STATE_ATTR = "__next_state__"
START_STATE_ATTR = "__start_state__"

class Vault(object):
    
    ## Vault internal functions :    
    @staticmethod
    def list_available_tutorials(activity_name = None, activity_vers = 0):
        """
        Generate the list of all tutorials present on disk for a
        given activity.

        @param activity_name the name of the activity associated with this tutorial. None means ALL activities
        @param activity_vers the version number of the activity to find tutorial for. 0 means find for ANY version. If activity_name is None, version number is not used
        @returns a map of tutorial {names : GUID}.
        """
        # check both under the activity data and user installed folders
        if _get_bundle_root() != None:
            paths = [_get_store_root(), _get_bundle_root()]
        else:
            paths = [_get_store_root()]

        tutoGuidName = {}

        for repository in paths:
            # (our) convention dictates that tutorial folders are named
            # with their GUID (for unicity)
            try:
                for tuto in os.listdir(repository):
                    parser = SafeConfigParser()
                    file = parser.read(os.path.join(repository, tuto, INI_FILENAME))
                    if file != []:
                        # If parser can read at least section
                        guid = parser.get(INI_METADATA_SECTION, INI_GUID_PROPERTY)
                        name = parser.get(INI_METADATA_SECTION, INI_NAME_PROPERTY)
                        activities = parser.options(INI_ACTIVITY_SECTION)
                        # enforce matching activity name AND version, as UI changes
                        # break tutorials. We may lower this requirement when the
                        # UAM gets less dependent on the widget order.
                        # Also note property names are always stored lowercase.
                        if (activity_name != None) and (activity_name.lower() in activities):
                            version = parser.get(INI_ACTIVITY_SECTION, activity_name)
                            if (activity_vers == version) or (activity_vers == 0):
                                tutoGuidName[guid] = name
                        elif (activity_name == None):
                            tutoGuidName[guid] = name
            except OSError:
                # the repository may not exist. Continue scanning
                pass

        return tutoGuidName
    
    ## Vault interface functions :
    @staticmethod
    def installTutorials(path, zip_file_name, forceinstall=False):
        """
        Extract the tutorial files in the ZIPPED tutorial archive at the
        specified path and add them inside the vault. This should remove any previous
        version of this tutorial, if there's any. On the opposite, if we are
        trying to install an earlier version, the function will return 1 if
        forceInstall is not set to true.
        
        @params path The path where the zipped tutorial archive is present
        @params forceinstall A flag that indicate if we need to force overwrite
        of a tutorial even if is version number is lower than the existing one.
        
        @returns 0 if it worked, 1 if the user needs to confirm the installation
        and 2 to mean an error happened
        """
        # TODO : Check with architecture team for exception vs error returns
        
        # test if the file is a valid pkzip file
        if zipfile.is_zipfile(os.path.join(path, zip_file_name)) != True:
            assert False, "Error : The given file is not a valid PKZip file"
                        
        # unpack the zip archive
        zfile = zipfile.ZipFile(os.path.join(path, zip_file_name), "r" )
        
        temp_path = tempfile.mkdtemp(dir=_get_store_root())
        zfile.extractall(temp_path)
            
        # get the tutorial file
        ini_file_path = os.path.join(temp_path, INI_FILENAME)
        ini_file = SafeConfigParser()
        ini_file.read(ini_file_path)
        
        # get the tutorial guid
        guid = ini_file.get(INI_METADATA_SECTION, INI_GUID_PROPERTY)
        
        # Check if tutorial already exist
        tutorial_path = os.path.join(_get_store_root(), guid)
        if os.path.isdir(tutorial_path) == False:
            # Copy the tutorial in the Vault
            shutil.copytree(temp_path, tutorial_path)
        
        else:
            # Check the version of the existing tutorial
            existing_version = ini_file.get(INI_METADATA_SECTION, INI_VERSION_PROPERTY)
            # Check the version of the new tutorial
            new_ini_file = SafeConfigParser()
            new_ini_file.read(os.path.join(tutorial_path, INI_FILENAME))
            new_version = new_ini_file.get(INI_METADATA_SECTION, INI_VERSION_PROPERTY)
            
            if new_version < existing_version and forceinstall == False:
                # Version of new tutorial is older and forceinstall is false, return exception
                return 1
            else :
                # New tutorial is newer or forceinstall flag is set, can overwrite the existing tutorial
                shutil.rmtree(tutorial_path)
                shutil.copytree(temp_path, tutorial_path)
                
        # Remove temp data
        shutil.rmtree(temp_path)
            
        return 0
        
    @staticmethod
    def query(keyword=[], relatedActivityNames=[], category=[]):
        """
        Returns the list of tutorials that corresponds to the specified parameters.
        
        @returns a list of Tutorial meta-data (TutorialID, Description,
        Rating, Category, PublishState, etc...)
        
        The returned dictionnary is of this format : key = property name, value = property value
        The dictionnary also contain one dictionnary element whose key is the string 'activities'
        and whose value is another dictionnary of this form : key = related activity name,
        value = related activity version number
        """

        tutorial_list = []
        tuto_guid_list = []
        ini_file = SafeConfigParser()
        # get all tutorials tuples (name:guid) for all activities and version
        tuto_dict = Vault.list_available_tutorials()
        for id in tuto_dict.keys():
            tuto_guid_list.append(id)


        # Find .ini metadata files with the guid list
        # Get the guid from the tuto tuples
        for guid in tuto_guid_list:
            addition_flag = True
            # Create a dictionnary containing the metadata and also
            # another dictionnary containing the tutorial Related Activities,
            # and add it to a list
            
            ini_file = SafeConfigParser()
            
            # Create a TutorialBundler object from the guid
            bundler = TutorialBundler(guid)
            # Find the .ini file path for this guid
            ini_file_path = bundler.get_tutorial_path(guid)
            # Read the .ini file
            ini_file.read(os.path.join(ini_file_path, 'meta.ini'))

            metadata_dictionnary = {}
            related_act_dictionnary = {}
            metadata_list = ini_file.options(INI_METADATA_SECTION)
            
            for metadata_name in metadata_list:
                 # Create a dictionnary of tutorial metadata
                 metadata_dictionnary[metadata_name] = ini_file.get(INI_METADATA_SECTION, metadata_name)
            # Get Related Activities data from.ini files
            related_act_list = ini_file.options(INI_ACTIVITY_SECTION)
            for related_act in related_act_list:
                # For related activites, the format is : key = activity name, value = activity version
                related_act_dictionnary[related_act] = ini_file.get(INI_ACTIVITY_SECTION, related_act)
            
            # Add Related Activities dictionnary to metadata dictionnary
            metadata_dictionnary['activities'] = related_act_dictionnary
            
            # Filter tutorials for keyword (full or partial)
            if keyword != []:
                addition_flag = False
                # Check if at least one keyword of the list is present
                for key in keyword:
                    if key != None:
                        for value in metadata_dictionnary.values():
                            if isinstance(value, str):
                                if value.lower().count(key.lower()) > 0:
                                    addition_flag = True
                            # Check one layer of depth in the metadata to find the keyword
                            # (for exemple, related activites are a dictionnary stocked
                            # in a value of the main dictionnary)        
                            elif isinstance(value, dict):
                                for inner_key, inner_value in value.items():
                                    if isinstance(inner_value, str) and isinstance(inner_key, str) and (inner_value.lower().count(key.lower()) > 0 or inner_key.count(key.lower()) > 0):
                                        addition_flag = True

            # Filter tutorials for related activities
            if relatedActivityNames != []:
                addition_flag = False
                # Check if at least one element of the list is present
                for related in relatedActivityNames:
                    if related != None and related.lower() in related_act_dictionnary.keys():
                        addition_flag = True
                        
            # Filter tutorials for categories
            if category != []:
                addition_flag = False
                # Check if at least one element of the list is present
                for cat in category:
                    if cat != None and metadata_dictionnary.has_key(INI_CATEGORY_PROPERTY) and metadata_dictionnary[INI_CATEGORY_PROPERTY].lower() == cat.lower():
                        addition_flag = True
                
            # Add this dictionnary to tutorial list if it has not been filtered
            if addition_flag == True:
                tutorial_list.append(metadata_dictionnary)
             
        # Return tutorial list
        return tutorial_list
        
            
    @staticmethod    
    def loadTutorial(Guid):
        """
        Creates an executable version of a tutorial from its saved representation.
        @param Guid Unique identifier of the tutorial
        @returns Tutorial object
        """
        
        bundle = TutorialBundler(Guid)
        bundle_path = bundle.get_tutorial_path(Guid)
        config = SafeConfigParser()
        config.read(os.path.join(bundle_path, INI_FILENAME))

        serializer = XMLSerializer()

        name = config.get(INI_METADATA_SECTION, INI_NAME_PROPERTY)

        # Open the XML file
        tutorial_file = os.path.join(bundle_path, TUTORIAL_FILENAME)
        with open(tutorial_file, 'r') as tfile:
            tutorial = serializer.load_tutorial(tfile)

        return tutorial
        
    @staticmethod    
    def saveTutorial(tutorial, metadata_dict):
        """
        Creates a persistent version of a tutorial in the Vault.
        @param tutorial Tutorial
        @param metadata_dict dictionary of metadata for the Tutorial
        @returns true if the tutorial was saved correctly
        """
        
        # Get the tutorial guid from metadata dictionnary
        guid = metadata_dict[INI_GUID_PROPERTY]
        
        # Check if tutorial already exist
        tutorial_path = os.path.join(_get_store_root(), guid)
        if os.path.isdir(tutorial_path) == False:
            
            # Serialize the tutorial and write it to disk
            xml_ser = XMLSerializer()
            os.makedirs(tutorial_path)

            with open(os.path.join(tutorial_path, TUTORIAL_FILENAME), 'w') as fsmfile:
                xml_ser.save_tutorial(tutorial, fsmfile)
            
            # Create the metadata file
            ini_file_path = os.path.join(tutorial_path, "meta.ini")
            parser = SafeConfigParser()
            parser.add_section(INI_METADATA_SECTION)
            for key, value in metadata_dict.items():
                if key != 'activities':
                    parser.set(INI_METADATA_SECTION, key, value)
                else:
                    related_activities_dict = value
                    parser.add_section(INI_ACTIVITY_SECTION)
                    for related_key, related_value in related_activities_dict.items():
                        parser.set(INI_ACTIVITY_SECTION, related_key, related_value)

            # Write the file to disk
            with open(ini_file_path, 'wb') as configfile:
                parser.write(configfile)

            l10n_path = os.path.join(tutorial_path, LOCALIZATION_FOLDER)
            os.mkdir(l10n_path)
            # Write the localization template (.pot) file
            with open(os.path.join(l10n_path, 'tutorial_text.pot'), "wb") as l10n_file:
                LocalizationHelper.write_translation_file(tutorial, l10n_file)

        else:
            # Error, tutorial already exist
            return False
    
    
    @staticmethod
    def deleteTutorial(Guid):
        """
        Removes the tutorial from the Vault. It will unpublish the tutorial if need be,
        and it will also wipe it from the persistent storage.
        @returns true is the tutorial was deleted from the Vault
        """
        bundle = TutorialBundler(Guid)
        bundle_path = bundle.get_tutorial_path(Guid)
        
        # TODO : Need also to unpublish tutorial, need to interact with webservice module
        
        shutil.rmtree(bundle_path)
        if os.path.isdir(bundle_path) == False:
            return True
        else:
            return False
        
        
    @staticmethod
    def update_metadata(guid, metadata_dict):
        """
        Modify the metadata of given tutorial found whit his guid.
        @params guid of the tutorial to update the metadata.
        @params metadata_dict the new metadata to update from
        """
        
        bundle = TutorialBundler(guid)
        tutorial_path = bundle.get_tutorial_path(guid)
        # Create the metadata file
        ini_file_path = os.path.join(tutorial_path, "meta.ini")
        parser = SafeConfigParser()
        parser.add_section(INI_METADATA_SECTION)
        for key, value in metadata_dict.items():
            if key != 'activities':
                parser.set(INI_METADATA_SECTION, key, value)
            else:
                related_activities_dict = value
                parser.add_section(INI_ACTIVITY_SECTION)
                for related_key, related_value in related_activities_dict.items():
                    parser.set(INI_ACTIVITY_SECTION, related_key, related_value)
                    
        # Delete the old metadata file
##        if os.path.isfile(ini_file_path):
##            os.remove(ini_file_path)
        
        # Write the new metadata file to disk
        with open(ini_file_path, 'wb') as configfile:
            parser.write(configfile)
        
        if os.path.isfile(ini_file_path):
            return True
        else:
            return False


    @staticmethod
    def get_tutorial_archive(guid):
        """
        Zip the files of the tutorial indentified with is guid and returns it.
        @params guid the guid of the tutorial to zip
        @returns a zip archive containing the files of the tutorial
        """
        bundle = TutorialBundler(guid)
        bundle_path = bundle.get_tutorial_path(guid)
        
        #Zip the tutorials files in the pkzip file format in a temp file
        archive_list = [os.path.join(bundle_path, 'meta.ini'), os.path.join(bundle_path, 'tutorial.xml')]
        
        # Add all the files in the archive folder
        for root, dirs, files in os.walk(os.path.join(bundle_path, RESOURCES_FOLDER)):
            for name in files:
                archive_list.append(os.path.join(bundle_path, RESOURCES_FOLDER, name))
        
        zfilename = str(guid) + ".zip"
        
        zout = zipfile.ZipFile(os.path.join(bundle_path, zfilename), "w")
        for fname in archive_list:
            fname_splitted = fname.rsplit('/')
            if fname_splitted[-2] == RESOURCES_FOLDER:
                ressource_path_and_file = os.path.join(fname_splitted[-2], fname_splitted[-1])
                zout.write(fname, ressource_path_and_file)
            else:    
                file_only_name = fname_splitted[-1]
                zout.write(fname, file_only_name)
        zout.close()
        
        # test if the temp file is a valid pkzip file
        assert zipfile.is_zipfile(os.path.join(bundle_path, zfilename)) == True, "The zipping of the tutorial files failed."
        
        # open the temp archive file in read mode
        zin = open(os.path.join(bundle_path, zfilename), "r")
        archive_data = zin.read()
        zin.close()
        
        # delete temp file 
        os.remove(os.path.join(bundle_path, zfilename))
        
        # return zip object data        
        return archive_data
        

    @staticmethod
    def add_resource(tutorial_guid, file_path):
        """
        Add given resource file in the vault and returns a unique name for this resource
        composed from the original name of the file and a suffix to make it unique
        ( ex: name_1.jpg ).
        @param tutorial_guid The guid of the tutorial
        @param file_path the file path of the resource to add
        @returns the resource_id of the resource
        """
        assert os.path.isfile(file_path)
        # Get the tutorial path
        bundler = TutorialBundler(tutorial_guid)
        tutorial_path = bundler.get_tutorial_path(tutorial_guid)
        # Get the file name
        file_name = os.path.basename(file_path)
        #fname_splitted = file_path.rsplit('/')
        #file_name = fname_splitted[fname_splitted.__len__() - 1]
        base_name, extension = os.path.splitext(file_name)
        # Append unique name to file name
        file_name_appended = base_name + '_' + str(uuid.uuid1()) + extension
        # Check if the resource file already exists
        new_file_path = os.path.join(tutorial_path, RESOURCES_FOLDER, file_name_appended)
        if os.path.isfile(new_file_path) == False:
            # Copy the resource file in the vault
            if os.path.isdir(os.path.join(tutorial_path, RESOURCES_FOLDER)) == False:
                os.makedirs(os.path.join(tutorial_path, RESOURCES_FOLDER))
            shutil.copyfile(file_path, new_file_path)
        
        return file_name_appended
    
    
    @staticmethod
    def delete_resource(tutorial_guid, resource_id):
        """
        Delete the resource from the resources of the tutorial.
        @param tutorial_guid the guid of the tutorial
        @param resource_id the resource id of the resource to delete
        """
        # Get the tutorial path
        bundler = TutorialBundler(tutorial_guid)
        tutorial_path = bundler.get_tutorial_path(tutorial_guid)
        # Check if the resource file exists
        file_path = os.path.join(tutorial_path, RESOURCES_FOLDER, resource_id)
        if os.path.isfile(file_path):
            # Delete the resource
            os.remove(file_path)
        else:
            logging.info('File not found, no delete took place')
        
    @staticmethod
    def get_resource_path(tutorial_guid, resource_id):
        """
        Returns the absolute file path to the resourceID
        @param tutorial_guid the guid of the tutorial
        @param resource_id the resource id of the resource to find the path for
        @returns the absolute path of the resource file
        """
        # Get the tutorial path
        bundler = TutorialBundler(tutorial_guid)
        tutorial_path = bundler.get_tutorial_path(tutorial_guid)
        # Check if the resource file exists
        file_path = os.path.join(tutorial_path, RESOURCES_FOLDER, resource_id)
        logger.debug("Vault :: Assigning resource %s to file %s "%(resource_id, file_path))
        if os.path.isfile(file_path):
            return  file_path
        else:
            return None
        
    @staticmethod
    def get_localization_dir(tutorial_guid):
        """
        Returns the base folder under which all the <language>/LC_MESSAGES/tutorial_text.mo
        are stored. These files are used for runtime translations by the Resource
        Translator.

        @param tutorial_guid the guid of the tutorial
        @returns the directory that stores the translation objects
        """
        # Get the tutorial path
        bundler = TutorialBundler(tutorial_guid)
        tutorial_path = bundler.get_tutorial_path(tutorial_guid)
        # Check if the localization directory exists
        l10n_dir = os.path.join(tutorial_path, LOCALIZATION_FOLDER)
        if os.path.isdir(l10n_dir):
            return l10n_dir
        else:
            return None

class Serializer(object):
    """
    Interface that provide serializing and deserializing of the FSM
    used in the tutorials to/from disk. Must be inherited.
    """
    
    def save_tutorial(self,fsm):
        """
        Save fsm to disk. If a GUID parameter is provided, the existing GUID is
        located in the .ini files in the store root and bundle root and
        the corresponding FSM is/are overwritten. If the GUId is not found, an 
        exception occur. If no GUID is provided, FSM is written in a new file 
        in the store root.
        """
        raise NotImplementedError()
        
    def load_tutorial(self):
        """
        Load fsm from disk.
        """
        raise NotImplementedError()
        
class XMLSerializer(Serializer):
    """
    Class that provide serializing and deserializing of the FSM
    used in the tutorials to/from a .xml file. Inherit from Serializer
    """

    @classmethod
    def _create_state_dict_node(cls, state_dict, doc):
        """
        Create and return a xml Node from a State dictionnary.
        @param state_dict dictionary of State objects
        @param doc The XML document root (used to create nodes only
        @return xml Element containing the states
        """
        statesList = doc.createElement(ELEM_STATES)
        for state_name, state in state_dict.items():
            stateNode = doc.createElement(ELEM_STATE)
            statesList.appendChild(stateNode)
            stateNode.setAttribute("Name", state_name)
            actionsList = stateNode.appendChild(cls._create_action_list_node(state.get_action_dict(), doc))
            transitionsList = stateNode.appendChild(cls._create_transitions_node(state.get_transition_dict(), doc))
        return statesList

    @classmethod
    def _create_addon_component_node(cls, parent_attr_name, comp, doc):
        """
        Takes a component that is embedded in another component (e.g. the content
        of a OnceWrapper) and encapsulate it in a node with the property name.

        e.g.
        <Component Class="OnceWrapper">
            <property name="addon">
                <Component Class="BubbleMessage" message="'Hi!'" position="[12,32]"/>
            </property>
        </Component>
        
        When reloading this node, we should look up the property name for the parent
        in the attribute of the node, then examine the subnode to create the addon
        object itself.

        @param parent_attr_name The name of the parent's attribute for this addon
                e.g. the OnceWrapper has the action attribute, which corresponds to a
                    sub-action it must execute once.
        @param comp The component node itself
        @param doc The XML document root (only used to create the nodes)
        @returns A NODE_SUBCOMPONENT node, with the property attribute and a sub node 
                that represents another component.
        """
        subCompNode = doc.createElement(NODE_SUBCOMPONENT)
        subCompNode.setAttribute("name", parent_attr_name)

        subNode = cls._create_component_node(comp, doc)

        subCompNode.appendChild(subNode)

        return subCompNode

    @classmethod
    def _create_addonlist_component_node(cls, parent_attr_name, comp_list, doc):
        """
        Takes a list of components that are embedded in another component (ex. the
        content of a ChainAction) and encapsulate them in a node with the property
        name.
        
        e.g.
        <Component Class="ChainAction">
            <listproperty name="actions">
                <Component Class="BubbleMessage" message="'Hi!'" position="[15,35]"/> 
                <Component Class="DialogMessage" message="'Multi-action!'" position="[45,10]"/>
            </listproperty>
        </Component>

        When reloading this node, we should look up the property name for the parent
        in the the attribute of the node, then rebuild the list by appending the 
        content of all the subnodes.

        @param parent_attr_name The name of the parent component's property
        @param comp_list A list of components that comprise the property
        @param doc The XML document root (only for creating new nodes)
        @returns A NODE_SUBCOMPONENTLIST node with the property attribute
        """
        subCompListNode = doc.createElement(NODE_SUBCOMPONENTLIST)
        subCompListNode.setAttribute("name", parent_attr_name)

        for comp in comp_list:
            compNode = cls._create_component_node(comp, doc)
            subCompListNode.appendChild(compNode)

        return subCompListNode

    @classmethod
    def _create_component_node(cls, comp, doc):
        """
        Takes a single component (action or eventfilter) and transforms it 
        into a xml node.
        
        @param comp A single component
        @param doc The XML document root (used to create nodes only
        @return A XML Node object with the component tag name
        """
        compNode = doc.createElement(NODE_COMPONENT)
        
        # Write down just the name of the Action class as the Class
        # property --
        compNode.setAttribute("Class",type(comp).__name__)

        # serialize all tutorius properties
        for propname in comp.get_properties():
            propval = getattr(comp, propname)
            if getattr(type(comp), propname).type == "addonlist":
                compNode.appendChild(cls._create_addonlist_component_node(propname, propval, doc))
            elif getattr(type(comp), propname).type == "addon":
                #import rpdb2; rpdb2.start_embedded_debugger('pass')
                compNode.appendChild(cls._create_addon_component_node(propname, propval, doc))
            else:
                # repr instead of str, as we want to be able to eval() it into a
                # valid object.
                compNode.setAttribute(propname, repr(propval))
        
        return compNode

    @classmethod
    def _create_action_list_node(cls, action_dict, doc):
        """
        Create and return a xml Node from a Action list.
        
        @param action_dict Dictionary of actions with names as keys
        @param doc The XML document root (used to create new nodes only)
        @return A XML Node object with the Actions tag name and a serie of 
        Action children
        """
        actionsList = doc.createElement(ELEM_ACTIONS)
        for name, action in action_dict.items():
            # Create the action node
            actionNode = cls._create_component_node(action, doc)
            actionNode.setAttribute(NAME_ATTR, name)
            # Append it to the list
            actionsList.appendChild(actionNode)
            
        return actionsList

    @classmethod
    def _create_transitions_node(cls, transition_dict, doc):
        """
        Create and return a xml Node from a transition dictionary.
        @param transition_dict dictionary of (event, next_state) transitions.
        @param doc The XML document root (used to create nodes only
        @return xml Element containing the transitions
        """
        eventFiltersList = doc.createElement(ELEM_TRANS)
        for transition_name, (event, end_state) in transition_dict.items():
            #start_state = transition_name.split(Tutorial._NAME_SEPARATOR)[0]
            #XXX The addon is not in the cache and cannot be loaded so we
            # store it differently for now
            if type(event) == AutomaticTransitionEvent:
                eventFilterNode = doc.createElement(ELEM_AUTOTRANS)
            else:
                eventFilterNode = cls._create_component_node(event, doc)
            #eventFilterNode.setAttribute(START_STATE_ATTR, unicode(start_state))
            eventFilterNode.setAttribute(NEXT_STATE_ATTR, unicode(end_state))
            eventFilterNode.setAttribute(NAME_ATTR, transition_name)
            eventFiltersList.appendChild(eventFilterNode)

        return eventFiltersList

    @classmethod
    def save_tutorial(cls, fsm, file_obj):
        """
        Save fsm to file

        @param fsm Tutorial to save
        @param file_obj file-like object in which the serialized fsm is saved

        Side effects:
            A serialized version of the Tutorial is written to file_obj.
            The file is not closed automatically.
        """ 
        doc = xml.dom.minidom.Document()
        fsm_element = doc.createElement(ELEM_FSM)
        doc.appendChild(fsm_element)

        fsm_element.setAttribute("Name", fsm.name)

        states = cls._create_state_dict_node(fsm.get_state_dict(), doc)
        fsm_element.appendChild(states)

        file_obj.write(doc.toprettyxml())

    @classmethod
    def _get_direct_descendants_by_tag_name(cls, node, name):
        """
        Searches in the list of direct descendants of a node to find all the node
        that have the given name.
        
        This is used because the Document.getElementsByTagName() function returns the
        list of all the descendants (whatever their distance to the start node) that
        have that name. In the case of complex components, we absolutely need to inspect
        a single layer of the tree at the time.
        
        @param node The node from which we want the direct descendants with a particular
                    name
        @param name The name of the node
        @returns A list, possibly empty, of direct descendants of node that have this name 
        """
        return_list = []
        for childNode in node.childNodes:
            if childNode.nodeName == name:
                return_list.append(childNode)
        return return_list

    @classmethod
    def _load_xml_transitions(cls, filters_elem):
        """
        Loads up a list of Event Filters.
        
        @param filters_elem An XML Element representing a list of event filters
        @return dict of (event, next_state) transitions, keyed by name
        """
        transition_dict = {}

        #Retrieve normal transitions
        transition_element_list = cls._get_direct_descendants_by_tag_name(filters_elem, NODE_COMPONENT)
        new_transition = None
        
        for transition in transition_element_list:
            #start_state = transition.getAttribute(START_STATE_ATTR)
            next_state = transition.getAttribute(NEXT_STATE_ATTR)
            transition_name = transition.getAttribute(NAME_ATTR)
            try:
                #The attributes must be removed so that they are not
                # viewed as a property in load_xml_component
            #    transition.removeAttribute(START_STATE_ATTR)
                transition.removeAttribute(NEXT_STATE_ATTR)
                transition.removeAttribute(NAME_ATTR)
            except NotFoundErr:
                continue

            new_transition = cls._load_xml_component(transition)
            
            if new_transition is not None:
                transition_dict[transition_name] = (new_transition, next_state)

        #Retrieve automatic transitions
        # XXX This is done differently as the AutomaticTransitionEvent
        #   cannot be loaded dynamically (yet?)
        transition_element_list = cls._get_direct_descendants_by_tag_name(filters_elem, ELEM_AUTOTRANS)
        new_transition = None
        
        for transition in transition_element_list:
            #start_state = transition.getAttribute(START_STATE_ATTR)
            next_state = transition.getAttribute(NEXT_STATE_ATTR)
            transition_name = transition.getAttribute(NAME_ATTR)
            try:
                #The attributes must be removed so that they are not
                # viewed as a property in load_xml_component
            #    transition.removeAttribute(START_STATE_ATTR)
                transition.removeAttribute(NEXT_STATE_ATTR)
                transition.removeAttribute(NAME_ATTR)
            except NotFoundErr:
                continue
            
            transition_dict[transition_name] = (AutomaticTransitionEvent(), next_state)
            
        return transition_dict

    @classmethod
    def _load_xml_subcomponents(cls, node, properties):
        """
        Loads all the subcomponent node below the given node and inserts them with
        the right property name inside the properties dictionnary.

        @param node The parent node that contains one or many property nodes.
        @param properties A dictionnary where the subcomponent property names
                and the instantiated components will be stored
        @returns Nothing. The properties dict will contain the property->comp mapping.
        """
        subCompList = cls._get_direct_descendants_by_tag_name(node, NODE_SUBCOMPONENT)

        for subComp in subCompList:
            property_name = subComp.getAttribute("name")
            internal_comp_node = cls._get_direct_descendants_by_tag_name(subComp, NODE_COMPONENT)[0]
            internal_comp = cls._load_xml_component(internal_comp_node)
            properties[str(property_name)] = internal_comp

    @classmethod
    def _load_xml_subcomponent_lists(cls, node, properties):
        """
        Loads all the subcomponent lists below the given node and stores them
        under the correct property name for that node.

        @param node The node from which we want to read the subComponent lists
        @param properties The dictionnary that will contain the mapping of prop->subCompList
        @returns Nothing. The values are returns inside the properties dict.
        """
        listOf_subCompListNode = cls._get_direct_descendants_by_tag_name(node, NODE_SUBCOMPONENTLIST)
        for subCompListNode in listOf_subCompListNode:
            property_name = subCompListNode.getAttribute("name")
            subCompList = []
            for subCompNode in cls._get_direct_descendants_by_tag_name(subCompListNode, NODE_COMPONENT):
                subComp = cls._load_xml_component(subCompNode)
                subCompList.append(subComp)
            properties[str(property_name)] = subCompList

    @classmethod
    def _load_xml_component(cls, node):
        """
        Loads a single addon component instance from an Xml node.
        
        @param node The component XML Node to transform
        object
        @return The addon component object of the correct type according to the XML
        description
        """
        class_name = node.getAttribute("Class")
        
        properties = {}

        for prop in node.attributes.keys():
            if prop == "Class" : continue
            # security : keep sandboxed
            properties[str(prop)] = eval(node.getAttribute(prop))

        # Read the complex attributes
        cls._load_xml_subcomponents(node, properties)
        cls._load_xml_subcomponent_lists(node, properties)

        new_action = addon.create(class_name, **properties)

        if not new_action:
            return None

        return new_action

    @classmethod
    def _load_xml_actions(cls, actions_elem):
        """
        Transforms an Actions element into a dict of instanciated Action.
        
        @param actions_elem An XML Element representing a list of Actions
        @return dictionary of actions keyed by name
        """
        action_dict = {}
        actions_element_list = cls._get_direct_descendants_by_tag_name(actions_elem, NODE_COMPONENT)
        
        for action in actions_element_list:
            action_name = action.getAttribute(NAME_ATTR)
            try:
                #The name attribute must be removed so that it is not
                # viewed as a property in load_xml_component
                action.removeAttribute(NAME_ATTR)
            except NotFoundErr:
                continue
            new_action = cls._load_xml_component(action)
            
            action_dict[action_name] = new_action
        
        return action_dict

    @classmethod
    def _load_xml_states(cls, states_elem):
        """
        Takes in a States element and fleshes out a complete list of State 
        objects.
        
        @param states_elem An XML Element that represents a list of States
        @return dictionary of States
        """
        state_dict = {}
        # item(0) because there is always only one <States> tag in the xml file
        # so states_elem should always contain only one element
        states_element_list = states_elem.item(0).getElementsByTagName(ELEM_STATE)
        
        for state in states_element_list:
            stateName = state.getAttribute("Name")
            # Using item 0 in the list because there is always only one 
            # Actions and EventFilterList element per State node.
            actions_list = cls._load_xml_actions(state.getElementsByTagName(ELEM_ACTIONS)[0])
            transitions_list = cls._load_xml_transitions(state.getElementsByTagName(ELEM_TRANS)[0])
            
            state_dict[stateName] = State(stateName, actions_list, transitions_list)
        
        return state_dict

    @classmethod
    def load_xml_tutorial(cls, fsm_elem):
        """
        Takes in an XML element representing an FSM and returns the fully 
        crafted FSM.
        
        @param fsm_elem The XML element that describes a FSM
        @return Tutorial loaded from xml element
        """
        # Load the FSM's name and start state's name
        fsm_name = fsm_elem.getAttribute("Name")
        
        # Load the states
        states_dict = cls._load_xml_states(fsm_elem.getElementsByTagName(ELEM_STATES))
        fsm = Tutorial(fsm_name, states_dict)
        
        return fsm

    @classmethod
    def load_tutorial(cls, tutorial_file):
        """
        Load fsm from xml file
        @param tutorial_file file-like object to read the fsm from
        @return Tutorial object that was loaded from the file
        """
        xml_dom = xml.dom.minidom.parse(tutorial_file)
        
        fsm_elem = xml_dom.getElementsByTagName(ELEM_FSM)[0]
        
        return cls.load_xml_tutorial(fsm_elem)

class TutorialBundler(object):
    """
    This class provide the various data handling methods useable by the tutorial
    editor.
    """
    
    def __init__(self,generated_guid = None, bundle_path=None):
        """
        Tutorial_bundler constructor. If a GUID is given in the parameter, the
        Tutorial_bundler object will be associated with it. If no GUID is given,
        a new GUID will be generated,
        """
            
        self.Guid = generated_guid or str(uuid.uuid1())

        #FIXME: Look for the bundle in the activity first (more specific)
        #Look for the file in the path if a uid is supplied
        if generated_guid:
            #General store
            store_path = os.path.join(_get_store_root(), str(generated_guid), INI_FILENAME)
            if os.path.isfile(store_path):
                self.Path = os.path.dirname(store_path)
            elif _get_bundle_root() != None:
                #Bundle store
                bundle_path = os.path.join(_get_bundle_root(), str(generated_guid), INI_FILENAME)
                if os.path.isfile(bundle_path):
                    self.Path = os.path.dirname(bundle_path)
                else:
                    raise IOError(2,"Unable to locate metadata file for guid '%s'" % generated_guid)
            else:
                raise IOError(2,"Unable to locate metadata file for guid '%s'" % generated_guid)

        else:
                #Create the folder, any failure will go through to the caller for now
                store_path = os.path.join(_get_store_root(), self.Guid)
                os.makedirs(store_path)
                self.Path = store_path

    def write_metadata_file(self, tutorial):
        """
        Write metadata to the property file. 
        @param tutorial Tutorial for which to write metadata
        """
        #Create the Config Object and populate it
        cfg = SafeConfigParser()
        cfg.add_section(INI_METADATA_SECTION)
        cfg.set(INI_METADATA_SECTION, INI_GUID_PROPERTY, self.Guid)
        cfg.set(INI_METADATA_SECTION, INI_NAME_PROPERTY, tutorial.name)
        cfg.set(INI_METADATA_SECTION, INI_XML_FSM_PROPERTY, TUTORIAL_FILENAME)
        cfg.add_section(INI_ACTIVITY_SECTION)
        if os.environ['SUGAR_BUNDLE_NAME'] != None and os.environ['SUGAR_BUNDLE_VERSION'] != None:
            cfg.set(INI_ACTIVITY_SECTION, os.environ['SUGAR_BUNDLE_NAME'],
                os.environ['SUGAR_BUNDLE_VERSION'])
        else:
            cfg.set(INI_ACTIVITY_SECTION, 'not_an_activity', '0')

        #Write the ini file
        cfg.write( file( os.path.join(self.Path, INI_FILENAME), 'w' ) )


    @staticmethod
    def get_tutorial_path(guid):
        """
        Finds the tutorial with the associated GUID. If it is found, return
        the path to the tutorial's directory. If it doesn't exist, raise an
        IOError.
        
        A note : if there are two tutorials with this GUID in the folders,
        they will both be inspected and the one with the highest version
        number will be returned. If they have the same version number, the one
        from the global store will be returned.
        
        @param guid The GUID of the tutorial that is to be loaded.
        """
        # Attempt to find the tutorial's directory in the global directory
        global_dir = os.path.join(_get_store_root(),str(guid))
        # Then in the activty's bundle path
        if _get_bundle_root() != None:
            activity_dir = os.path.join(_get_bundle_root(), str(guid))
        else:
            activity_dir = ''
        
        # If they both exist
        if os.path.isdir(global_dir) and os.path.isdir(activity_dir):
            # Inspect both metadata files
            global_meta = os.path.join(global_dir, "meta.ini")
            activity_meta = os.path.join(activity_dir, "meta.ini")
            
            # Open both config files
            global_parser = SafeConfigParser()
            global_parser.read(global_meta)
            
            activity_parser = SafeConfigParser()
            activity_parser.read(activity_meta)
            
            # Get the version number for each tutorial
            global_version = global_parser.get(INI_METADATA_SECTION, "version")
            activity_version = activity_parser.get(INI_METADATA_SECTION, "version")
            
            # If the global version is higher or equal, we'll take it
            if global_version >= activity_version:
                return global_dir
            else:
                return activity_dir
        
        # Do we just have the global directory?
        if os.path.isdir(global_dir):
            return global_dir
        
        # Or just the activity's bundle directory?
        if os.path.isdir(activity_dir):
            return activity_dir
        
        # Error : none of these directories contain the tutorial
        raise IOError(2, "Neither the global nor the bundle directory contained the tutorial with GUID %s"%guid)
    
    
    def write_fsm(self, fsm):

        """
        Save fsm to disk. If a GUID parameter is provided, the existing GUID is
        located in the .ini files in the store root and bundle root and
        the corresponding FSM is/are created or overwritten. If the GUID is not 
        found, an exception occur.
        """

        config = SafeConfigParser()

        serializer = XMLSerializer()
        path = os.path.join(self.Path, "meta.ini")
        config.read(path)
        xml_filename = config.get(INI_METADATA_SECTION, INI_XML_FSM_PROPERTY)
        serializer.save_tutorial(fsm, xml_filename, self.Path)

    @staticmethod
    def add_resources(typename, file):
        """
        Add resources to metadata.
        """
        raise NotImplementedError("add_resources not implemented")