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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 uuid
import xml.dom.minidom

from sugar.tutorius import gtkutils, overlayer
from sugar.tutorius.core import Tutorial, State, FiniteStateMachine
from sugar.tutorius.filters import *
from sugar.tutorius.actions import *
from ConfigParser import SafeConfigParser

def _get_store_root():
    return os.path.join(os.getenv("SUGAR_PREFIX"),"share","tutorius","data")
def _get_bundle_root():
    return os.path.join(os.getenv("SUGAR_BUNDLE_PATH"),"data","tutorius","data")

INI_ACTIVITY_SECTION = "RELATED_ACTIVITIES"
INI_METADATA_SECTION = "GENERAL_METADATA"
INI_GUID_PROPERTY = "GUID"
INI_NAME_PROPERTY = "NAME"
INI_XML_FSM_PROPERTY = "FSM_FILENAME"

class TutorialStore:
        
    def list_avaible_tutorials(self, activity_name, activity_vers):
        """
        Recuperate the list of all tutorials present on disk for a
        given activity.
        """
        
        store_root = _get_store_root()
        bundle_root = _get_bundle_root()
        
        logging.debug("***********   Path of store_root : " + store_root)
        
        # Create /data/tutorius if no exists
        if not os.path.exists(store_root):
            os.mkdir(store_root)
            logging.debug("*************   Creating %s folder" % store_root)
            
        tutoGuidName = {}
        
        # iterate in each GUID subfolder
        for dir in os.listdir(store_root):
            # iterate for each ".ini" file in the activity store_root folder        
            for file_name in os.listdir(store_root + "/" + dir):
                
                if file_name.endswith(".ini"):
                    logging.debug("**************  .ini file found : " + file_name)
                    # Filter for just .ini files who metadata ACTIVITY_NAME
                    # match 'activity_name' given in argument.
                    config = SafeConfigParser()
                    config.read(file_name)
                    # Get all activity tuples (Activity_Name: Activity_Version)
                    file_activity_tuples = config.items(INI_ACTIVITY_SECTION)
                    
                    for i in range(0, len(file_activity_tuples) - 1):
                        
                        if file_activity_tuples[i][0] == activity_name and  \
                        int(file_activity_tuples[i][1]) == activity_vers:
                            # Add this tutorial guid and name in the dictionary
                            file_activity_guid = config.get(INI_METADATA_SECTION,
                                INI_GUID_PROPERTY)
                            file_activity_name = config.get(INI_METADATA_SECTION,
                                INI_NAME_PROPERTY)
                            tutoGuidName[file_activity_name] = file_activity_guid

        return tutoGuidName
    

class Serializer:
    """
    Interface that provide serializing and deserializing of the FSM
    used in the tutorials to/from disk. Must be inherited.
    """
    
    def save_fsm(self,fsm, guid = None):
        """
        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.
        """
        NotImplementedError
        
    def load_fsm(self, guid):
        """
        Load fsm from disk.
        """
        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
    """
    
    def _create_state_dict_node(self, state_dict, doc):
        """
        Create and return a xml Node from a State dictionnary.
        """
        statesList = doc.createElement("States")
        for state_name, state in state_dict.items():
            stateNode = doc.createElement("State")
            statesList.appendChild(stateNode)
            stateNode.setAttribute("Name", state_name)
            actionsList = stateNode.appendChild(self._create_action_list_node(state.get_action_list(), doc))
            eventfiltersList = stateNode.appendChild(self._create_event_filters_node(state.get_event_filter_list(), doc))
        return statesList
    
    def _create_action_node(self, action, doc):
        """
        Takes a single action and transforms it into a xml node.
        
        @param action A single action
        @param doc The XML document root (used to create nodes only
        @return A XML Node object with the Action tag name
        """
        actionNode = doc.createElement("Action")
        
        # Write down just the name of the Action class as the Class
        # property --
        # Using .__class__ since type() doesn't have the same behavior 
        # with class derivating from object and class that don't
        actionNode.setAttribute("Class", str(action.__class__))
        
        if type(action) is DialogMessage:
            actionNode.setAttribute("Message", action.message.value)
            actionNode.setAttribute("PositionX", str(action.position.value[0]))
            actionNode.setAttribute("PositionY", str(action.position.value[1]))
        elif type(action) is BubbleMessage:
            actionNode.setAttribute("Message", action.message.value)
            actionNode.setAttribute("PositionX", str(action.position.value[0]))
            actionNode.setAttribute("PositionY", str(action.position.value[1]))
            actionNode.setAttribute("Tail_posX", str(action.tail_pos.value[0]))
            actionNode.setAttribute("Tail_posY", str(action.tail_pos.value[1]))
        # TO ADD : elif for each type of action
        elif type(action) is WidgetIdentifyAction:
            # Nothing else to save
            pass
        elif type(action) is ChainAction:
            # Recusively write the contained actions - in the correct order
            subActionsNode = self._create_action_list_node(action._actions, doc)
            actionNode.appendChild(subActionsNode)
        elif type(action) is DisableWidgetAction:
            # Remember the target
            actionNode.setAttribute("Target", action._target)
        elif type(action) is TypeTextAction:
            # Save the text and the widget
            actionNode.setAttribute("Widget", action._widget)
            actionNode.setAttribute("Text", action._text)
        elif type(action) is ClickAction:
            # Save the widget to click
            actionNode.setAttribute("Widget", action._widget)
        elif type(action) is OnceWrapper:
            # Encapsulate the action in a OnceWrapper
            subActionNode = self._create_action_node(action._action, doc)
            actionNode.appendChild(subActionNode)
            
        return actionNode
        
    def _create_action_list_node(self, action_list, doc):
        """
        Create and return a xml Node from a Action list.
        
        @param action_list A list of actions
        @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("Actions")
        for action in action_list:
            # Create the action node
            actionNode = self._create_action_node(action, doc)
            # Append it to the list
            actionsList.appendChild(actionNode)
            
        return actionsList
    
    def _create_event_filters_node(self, event_filters, doc):
        """
        Create and return a xml Node from a event filters.
        """
        eventFiltersList = doc.createElement("EventFiltersList")
        for event_f in event_filters:
            eventFilterNode = doc.createElement("EventFilter")
            eventFiltersList.appendChild(eventFilterNode)
            
            # Write down just the name of the Action class as the Class
            # property --
            # using .__class__ since type() doesn't have the same behavior 
            # with class derivating from object and class that don't
            eventFilterNode.setAttribute("Class", str(event_f.__class__))
            
            # Write the name of the next state
            eventFilterNode.setAttribute("NextState", event_f.next_state)
            
            if type(event_f) is TimerEvent:
                eventFilterNode.setAttribute("Timeout_s", str(event_f._timeout))
                
            elif type(event_f) is GtkWidgetEventFilter:
                eventFilterNode.setAttribute("EventName", event_f._event_name)
                eventFilterNode.setAttribute("ObjectId", event_f._object_id)
                
            elif type(event_f) is GtkWidgetTypeFilter:
                eventFilterNode.setAttribute("ObjectId", event_f._object_id)
                if event_f._strokes is not None:
                    eventFilterNode.setAttribute("Strokes", event_f._strokes)
                if event_f._text is not None:
                    eventFilterNode.setAttribute("Text", event_f._text)
                
        return eventFiltersList       

    def save_fsm(self, fsm, xml_filename, path):
        """
        Save fsm to disk, in the xml file specified by "xml_filename", in the 
        "path" folder. If the specified file doesn't exist, it will be created.
        """ 
        doc = xml.dom.minidom.Document()
        fsm_element = doc.createElement("FSM")
        doc.appendChild(fsm_element)
        fsm_element.setAttribute("Name", fsm.name)
        fsm_element.setAttribute("StartStateName", fsm.start_state_name)
        statesDict = fsm_element.appendChild(self._create_state_dict_node(fsm._states, doc))
        
        fsm_actions_node = self._create_action_list_node(fsm.actions, doc)
        fsm_actions_node.tagName = "FSMActions"
        actionsList = fsm_element.appendChild(fsm_actions_node)
        
        file_object = open(os.path.join(path, xml_filename), "w")
        file_object.write(doc.toprettyxml())
        file_object.close()
        
    
    def _find_tutorial_dir_with_guid(self, 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(), guid)
        # Then in the activty's bundle path
        activity_dir = os.path.join(_get_bundle_root(), guid)
        
        # 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 _load_xml_properties(self, properties_elem):
        """
        Changes a list of properties into fully instanciated properties.
        
        @param properties_elem An XML element reprensenting a list of 
        properties
        """
        return []
    
    def _load_xml_event_filters(self, filters_elem):
        """
        Loads up a list of Event Filters.
        
        @param filters_elem An XML Element representing a list of event filters
        """
        reformed_event_filters_list = []
        event_filter_element_list = filters_elem.getElementsByTagName("EventFilter")
        new_event_filter = None
        
        for event_filter in event_filter_element_list:
            # Load the name of the next state for this filter
            next_state = event_filter.getAttribute("NextState")
            
            if event_filter.getAttribute("Class") == str(TimerEvent):
                timeout = int(event_filter.getAttribute("Timeout_s"))
                new_event_filter = TimerEvent(next_state, timeout)
                
            elif event_filter.getAttribute("Class") == str(GtkWidgetEventFilter):
                # Get the event name and the object's ID
                event_name = event_filter.getAttribute("EventName")
                object_id = event_filter.getAttribute("ObjectId")
                
                new_event_filter = GtkWidgetEventFilter(next_state, object_id, event_name)
            elif event_filter.getAttribute("Class") == str(GtkWidgetTypeFilter):
                # Get the widget to write in and the text
                object_id = event_filter.getAttribute("ObjectId")
                if event_filter.hasAttribute("Text"):
                    text = event_filter.getAttribute("Text")
                    new_event_filter = GtkWidgetTypeFilter(next_state, object_id, text=text)
                elif event_filter.hasAttribute("Strokes"):
                    strokes = event_filter.getAttribute("Strokes")
                    new_event_filter = GtkWidgetTypeFilter(next_state, object_id, strokes=strokes)
            
            if new_event_filter is not None:
                reformed_event_filters_list.append(new_event_filter)
            
        return reformed_event_filters_list
    
    def _load_xml_action(self, action):
        """
        Loads a single action from an Xml Action node.
        
        @param action The Action XML Node to transform
        object
        @return The Action object of the correct type according to the XML
        description
        """
        # TO ADD: an elif for each type of action
        if action.getAttribute("Class") == str(DialogMessage):
            message = action.getAttribute("Message")
            positionX = int(action.getAttribute("PositionX"))
            positionY = int(action.getAttribute("PositionY"))
            position = [positionX, positionY]
            return DialogMessage(message,position)
        elif action.getAttribute("Class") == str(BubbleMessage):
            message = action.getAttribute("Message")
            positionX = int(action.getAttribute("PositionX"))
            positionY = int(action.getAttribute("PositionY"))
            position = [positionX, positionY]
            tail_posX = action.getAttribute("Tail_posX")
            tail_posY = action.getAttribute("Tail_posY")
            tail_pos = [tail_posX, tail_posY]
            return BubbleMessage(message,position,None,tail_pos)
        elif action.getAttribute("Class") == str(WidgetIdentifyAction):
            return WidgetIdentifyAction()
        elif action.getAttribute("Class") == str(ChainAction):
            # Load the subactions
            subActionsList = self._load_xml_actions(action.getElementsByTagName("Actions")[0])
            return ChainAction(subActionsList)
        elif action.getAttribute("Class") == str(DisableWidgetAction):
            # Get the target
            targetName = action.getAttribute("Target")
            return DisableWidgetAction(targetName)
        elif action.getAttribute("Class") == str(TypeTextAction):
            # Get the widget and the text to type
            widget = action.getAttribute("Widget")
            text = action.getAttribute("Text")
            
            return TypeTextAction(widget, text)
        elif action.getAttribute("Class") == str(ClickAction):
            # Load the widget to click
            widget = action.getAttribute("Widget")
            
            return ClickAction(widget)
    
    def _load_xml_actions(self, actions_elem):
        """
        Transforms an Actions element into a list of instanciated Action.
        
        @param actions_elem An XML Element representing a list of Actions
        """
        reformed_actions_list = []
        actions_element_list = actions_elem.getElementsByTagName("Action")
        
        for action in actions_element_list:
            new_action = self._load_xml_action(action)
            
            reformed_actions_list.append(new_action)
        
        return reformed_actions_list
    
    def _load_xml_states(self, 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
        """
        reformed_state_list = []
        # 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("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 = self._load_xml_actions(state.getElementsByTagName("Actions")[0])
            event_filters_list = self._load_xml_event_filters(state.getElementsByTagName("EventFiltersList")[0])
            reformed_state_list.append(State(stateName, actions_list, event_filters_list))
        
        return reformed_state_list
    
    def _load_xml_fsm(self, 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
        """
        # Load the FSM's name and start state's name
        fsm_name = fsm_elem.getAttribute("Name")
        
        fsm_start_state_name = None
        try:
            fsm_start_state_name = fsm_elem.getAttribute("StartStateName")
        except:
            pass
        
        fsm = FiniteStateMachine(fsm_name, start_state_name=fsm_start_state_name)
        
        # Load the states
        states = self._load_xml_states(fsm_elem.getElementsByTagName("States"))
        for state in states:
            fsm.add_state(state)
        
        # Load the actions on this FSM
        actions = self._load_xml_actions(fsm_elem.getElementsByTagName("FSMActions")[0])
        for action in actions:
            fsm.add_action(action)
            
        # Load the event filters
        events = self._load_xml_event_filters(fsm_elem.getElementsByTagName("EventFiltersList")[0])
        for event in events:
            fsm.add_event_filter(event)
            
        return fsm
        
    
    def load_fsm(self, guid):
        """
        Load fsm from xml file whose .ini file guid match argument guid.
        """
        # Fetch the directory (if any)
        tutorial_dir = self._find_tutorial_dir_with_guid(guid)
        
        # Open the XML file
        tutorial_file = os.path.join(tutorial_dir, "fsm.xml")
        
        xml_dom = xml.dom.minidom.parse(tutorial_file)
        
        fsm_elem = xml_dom.getElementsByTagName("FSM")[0]
        
        return self._load_xml_fsm(fsm_elem)
        
    
class TutorialBundler:
    """
    This class provide the various data handling methods useable by the tutorial
    editor.
    """
    
    def __init__(self,generated_guid = 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 uuid.uuid1()

        #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(), generated_guid, INI_FILENAME)
            if os.path.isfile(store_path):
                self.Path = os.path.dirname(store_path)
            else:
                #Bundle store
                bundle_path = os.path.join(_get_bundle_root(), 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:
                #Create the folder, any failure will go through to the caller for now
                store_path = os.path.join(_get_store_root(), generated_guid)
                os.mkdir(store_path)
                self.Path = store_path

            
        def __SetGuid(self, value):
            self.__guid = value
            
        def __GetGuid(self):
            return self.__guid
            
        def __DelGuid(self):
            del self.__guid
            
        def __SetPath(self, value):
            self.__path = value
            
        def __GetPath(self):
            return self.__path
            
        def __DelPath(self):
            del self.__path
            
        Guid = property(fget=__SetGuid,
                            fset=__GetGuid,
                            fdel=__DelGuid,
                            doc="The guid associated with the Tutoria_Bundler")
                            
        Path = property(fget=__SetPath,
                            fset=__GetPath,
                            fdel=__DelPath,
                            doc="The path associated with the Tutoria_Bundler")
            
        
    def write_metadata_file(self, data):
        """
        Write metadata to a property file. If a GUID is provided, TutorialBundler
        will try to find and overwrite the existing property file who contain the 
        given GUID, and will raise an exception if it cannot find it.
        """
        NotImplementedError
        
    def get_tutorial_path(self):
        """
        Return the path of the .ini file associated with the guiven guid set in
        the Guid property of the Tutorial_Bundler. If the guid is present in 
        more than one path, the store_root is given priority.
        """
        
        store_root = _get_store_root()
        bundle_root = _get_bundle_root()
        
        config = SafeConfigParser()
        path = None
        
        logging.debug("************ Path of store_root folder of activity : " \
            + store_root)
            
        # iterate in each GUID subfolder
        for dir in os.listdir(store_root):
            
            # iterate for each .ini file in the store_root folder
                            
            for file_name in os.listdir(store_root + "/" + dir):
                if file_name.endswith(".ini"):
                    logging.debug("******************* Found .ini file : " \
                        + file_name)
                    config.read(file_name)
                    if config.get(INI_METADATA_SECTION, INI_GUID_PROPERTY) == self.Guid:
                        xml_filename = config.get(INI_METADATA_SECTION,
                            INI_XML_FSM_PROPERTY)
                        
                        path = os.path.join(store_root, self.Guid)
                        return path
            
        logging.debug("************ Path of bundle_root folder of activity : " \
            + bundle_root)
            
                   
        # iterate in each GUID subfolder
        for dir in os.listdir(bundle_root):    
            
            # iterate for each .ini file in the bundle_root folder
            for file_name in os.listdir(bundle_root + "/" + dir):
                if file_name.endswith(".ini"):
                    logging.debug("******************* Found .ini file : " \
                        + file_name)
                    config.read(file_name)
                    if config.get(INI_METADATA_SECTION, INI_GUID_PROPERTY) == guid:
                        path = os.path.join(bundle_root, self.Guid)
                        return path
                
        if path is None:
            logging.debug("**************** Error : GUID not found")
            raise KeyError

    def write_fsm(self, fsm, guid=None):

        """
        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()
                   
        if guid is not None:
            serializer = XMLSerializer()
            path = get_tutorial_path() + "/meta.ini"
            config.read(path)
            xml_filename = config.get(INI_METADATA_SECTION, INI_XML_FSM_PROPERTY)
            serializer.save_fsm(fsm, xml_filename, store_root)
            
        
    def add_resources(self, typename, file):
        """
        Add ressources to metadata.
        """
        raise NotImplementedError("add_resources not implemented")