#!/usr/bin/python
# -*- coding: utf-8 -*-

"""
SAT: a jabber client
Copyright (C) 2009  Jérôme Poisson (goffi@goffi.org)

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 3 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, see <http://www.gnu.org/licenses/>.
"""

from __future__ import with_statement

import os.path
import time
import pickle
from logging import debug, info, error

const_SAVEFILE_PARAM=os.path.expanduser("~/.sat_param.save")
const_SAVEFILE_HISTORY=os.path.expanduser("~/.sat_history.save")

class Memory:
    """This class manage all persistent informations"""

    def __init__(self):
        info ("Memory manager init")
        self.contact={}
        self.presenceStatus={}
        self.params={}
        self.history={}
        self.disco={}  #XXX: maybe best in a separate class
        self.features={}
        self.load()

    def load_default_params(self):
        """Load default value, in case of no save file or error."""

        self.createParam("JabberID", "goffi@jabber.goffi.int/TestScript", "string", "Connection")
        self.createParam("Password", "toto", "password", "Connection")
        self.createParam("Server", "jabber.goffi.int", "string", "Connection")
        self.createParam("IP", "192.168.0.2", "string", "File Transfert")
        self.createParam("Port", "28915", "string", "File Transfert")
        self.createParam("Watched", "test@jabber.goffi.int", "string", "Misc") #TODO: a mettre dans un plugin

    def load(self):
        """Load parameters and all memory things from file/db"""

        #first parameters
        if os.path.exists(const_SAVEFILE_PARAM):
            try:
                with open(const_SAVEFILE_PARAM, 'r') as params_pickle:
                    self.params=pickle.load(params_pickle)
                debug("params loaded")
            except:
                error ("Can't load params !")
                self.load_default_params()
        else:
            self.load_default_params()

        #history
        if os.path.exists(const_SAVEFILE_HISTORY):
            try:
                with open(const_SAVEFILE_HISTORY, 'r') as history_pickle:
                    self.history=pickle.load(history_pickle)
                debug("history loaded")
            except:
                error ("Can't load history !")


    def save(self):
        """Save parameters and all memory things to file/db"""
        with open(const_SAVEFILE_PARAM, 'w') as params_pickle:
            pickle.dump(self.params, params_pickle)
        with open(const_SAVEFILE_HISTORY, 'w') as history_pickle:
            pickle.dump(self.history, history_pickle)

    def addToHistory(self, me_jid, from_jid, to_jid, type, message):
        me_short=me_jid.userhost()
        from_short=from_jid.userhost()
        to_short=to_jid.userhost()

        if from_jid==me_jid:
            key=to_short
        else:
            key=from_short

        if not self.history.has_key(me_short):
            self.history[me_short]={}
        if not self.history[me_short].has_key(key):
            self.history[me_short][key]={}

        self.history[me_short][key][int(time.time())] = (from_short, message)
        
    def getHistory(self, from_jid, to_jid, size):
        ret={}
        if not self.history.has_key(from_jid):
            error("source JID not found !")
            #TODO: throw an error here
            return {}
        if not self.history[from_jid].has_key(to_jid):
            error("dest JID not found !")
            #TODO: throw an error here
            return {}
        stamps=self.history[from_jid][to_jid].keys()
        stamps.sort()
        for stamp in stamps[-size:]:
            ret[stamp]=self.history[from_jid][to_jid][stamp]

        return ret

    def addContact(self, JID, attributes, groups):
        debug("Memory addContact: %s",JID)
        assert(isinstance(attributes,dict))
        assert(isinstance(groups,set))
        self.contact[JID]=[attributes, groups]

    def addPresenceStatus(self, jid, type, show, status, priority):
        self.presenceStatus[jid]=[type, show, status, priority]

    def getContacts(self):
        debug ("Memory getContact OK (%s)", self.contact)
        ret=[]
        for contact in self.contact:
            ret.append([contact] + [self.contact[contact][0]] + [self.contact[contact][1]]) #very ugly I know !
        return ret

    def getPresenceStatus(self):
        status=[]
        for contact, contactStatus in self.presenceStatus.items():
            status.append([contact]+contactStatus)
        debug ("Memory getPresenceStatus (%s)", status)
        return status

    def getParamV(self, name, namespace):
        """Helper method to get the value in the good type
           getParamV stands for GetParamValue"""
        if not self.params.has_key(namespace) or not self.params[namespace].has_key(name):
            error("Requested param %s in namespace %s doesn't exist !" , name, namespace)
            return None
        return self.params[namespace][name][0]


    def getParam(self, name, namespace):
        if self.params.has_key(namespace) and self.params[namespace].has_key(name):
            return self.params[namespace][name]
        return ["",""]

    def getParams(self, namespace):
        if self.params.has_key(namespace):
            ret=[]
            for name in self.params[namespace]:
                ret.append([name] + self.params[namespace][name])
            return ret
        return [[]]

    def getParamsCategories(self):
        """return the namespaces availables"""
        return self.params.keys()

    def setParam(self, name, value, namespace):
        if not self.params.has_key(namespace) or not self.params[namespace].has_key(name):
           return #TODO: throw an error
        self.params[namespace][name][0]=value;

    def createParam (self, name, value, type, namespace):
        ### TODO: add desciption in params
        if not self.params.has_key(namespace):
            self.params[namespace]={}
        self.params[namespace][name]=[value,type];

    def registerFeature(self, feature, callback=None):
        self.features[feature]=callback