#!/usr/bin/env python2
# -*- coding: utf-8 -*-

# SAT plugin for account creation (experimental)
# Copyright (C) 2009, 2010, 2011, 2012, 2013, 2014 Jérôme Poisson (goffi@goffi.org)

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero 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 Affero General Public License for more details.

# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

from twisted.words.xish import domish
from wokkel.subprotocols import XMPPHandler, IQHandlerMixin
from wokkel import disco, iwokkel, data_form
from twisted.words.protocols.jabber import jid
from zope.interface import implements
import uuid
import sqlite3
from os import path
from collections import OrderedDict
import gettext
gettext.install('sat', "i18n", unicode=True)

DATABASE = "salut.db"
ID_CMD_LIST = disco.DiscoIdentity("automation", "command-list")
NS_COMMANDS = "http://jabber.org/protocol/commands"
NS_SEARCH = 'jabber:iq:search'
QUERY_SEARCH = "/query[@xmlns='jabber:iq:search']"
SUBSCRIBE_CMD = "/iq[@type='set']/command[@xmlns='"+NS_COMMANDS+"' and @node='subscribe']"
UNSUBSCRIBE_CMD = "/iq[@type='set']/command[@xmlns='"+NS_COMMANDS+"' and @node='unsubscribe']"
INSTRUCTIONS = _(u'This is a minimal directory for the Libervia demo (Salut à Toi project). For testing purpose only.')
FORM_INSTRUCTIONS = [INSTRUCTIONS]

SUBSCRIBE_TXT = _(u"Please give some words about you, then submit to be registered on the directory")
SUBSCRIBE_DONE = _("You are now registered on the directory")
UNSUBSCRIBE_DONE = _("You have been removed from the directory")
DB_CREATE = ['PRAGMA user_version=0',
             'CREATE TABLE directory (jid TEXT PRIMARY KEY, description TEXT)']

class SalutGateway(XMPPHandler, IQHandlerMixin):
    implements(iwokkel.IDisco)

    def __init__(self, component=False):
        XMPPHandler.__init__(self)
        IQHandlerMixin.__init__(self)
        self.component = component
        self.discoHandler = disco.DiscoHandler()
        new_db = not path.exists(DATABASE)
        conn = sqlite3.connect(DATABASE)
        self.db = conn.cursor() # we use SQLite in a blocking way, performance is not such a big deal here
        if new_db:
            for statement in DB_CREATE:
                self.db.execute(statement)

    def connectionMade(self):
        print "Connected!"
        self.xmlstream.addObserver("/iq[@type='get']" + QUERY_SEARCH, self.handleFieldsRequest)
        self.xmlstream.addObserver("/iq[@type='set']" + QUERY_SEARCH, self.handleSearchRequest)
        self.xmlstream.addObserver(SUBSCRIBE_CMD, self.onSubscribe)
        self.xmlstream.addObserver(UNSUBSCRIBE_CMD, self.onUnsubscribe)
        self.discoHandler.setHandlerParent(self.parent)

    def connectionLost(self, reason):
        print "Disconnected!"

    def handleFieldsRequest(self, request):
        result = domish.Element((None, 'iq'))
        result['type'] = 'result'
        result['id'] = request['id']
        result['to'] = request['from']
        query_elt = result.addElement('query', NS_SEARCH)
        instructions_elt = query_elt.addElement('instructions', content=INSTRUCTIONS)
        form = data_form.Form('form', title=_('Directory search'),
                              instructions=FORM_INSTRUCTIONS,
                              formNamespace=NS_SEARCH)
        form.addField(data_form.Field('fixed', label=_('Enter part of description or jid to find somebody,')))
        form.addField(data_form.Field('fixed', label=('let empty to have a full list of people')))
        form.addField(data_form.Field('text-single', 'jid', label=_('jid')))
        form.addField(data_form.Field('text-single', 'description', label=_('Description')))
        query_elt.addChild(form.toElement())
        self.xmlstream.send(result)

    def handleSearchRequest(self, request):
        query = ["SELECT jid, description FROM directory"]
        args = OrderedDict()
        try:
            query_elt = request.elements(NS_SEARCH, 'query').next()
            form_elt = query_elt.elements(data_form.NS_X_DATA, 'x').next()
            parsed_form = data_form.Form.fromElement(form_elt)
            for col in ('jid', 'description'):
                value = parsed_form[col].strip()
                if value:
                    args[col] = value
        except (StopIteration, KeyError):
            raise ValueError # TODO: proper error handling

        if args:
            query.append("WHERE")
            query.append(" AND ".join(("%s LIKE ?" % col for col in args)))

        row_iter = self.db.execute(' '.join(query), tuple(['%'+arg+'%' for arg in args.values()]))

        result = domish.Element((None, 'iq'))
        result['type'] = 'result'
        result['id'] = request['id']
        result['to'] = request['from']
        query_elt = result.addElement('query', NS_SEARCH)
        x_form = data_form.Form('result', formNamespace = NS_SEARCH)
        x_form_elt = x_form.toElement()
        reported_elt = x_form_elt.addElement('reported')
        jid_field_elt = reported_elt.addElement('field')
        jid_field_elt['label'] = 'Jabber ID'
        jid_field_elt['var'] = 'jid'
        description_field_elt = reported_elt.addElement('field')
        description_field_elt['label'] = 'Description'
        description_field_elt['var'] = 'description'
        for row in row_iter:
            for col, value in zip(('jid', 'description'), row):
                item_elt = x_form_elt.addElement('item')
                field_elt = item_elt.addElement('field')
                field_elt['var'] = col
                value_elt = field_elt.addElement('value', content=value)

        query_elt.addChild(x_form_elt)
        self.xmlstream.send(result)

    def onSubscribe(self, request):
        result = domish.Element((None, 'iq'))
        result['type'] = 'result'
        result['id'] = request['id']
        result['to'] = request['from']
        from_ = jid.JID(request['from'])
        request_cmd = request.elements(NS_COMMANDS, 'command').next()
        command_elt = result.addElement('command', NS_COMMANDS)
        try:
            session_id = request_cmd['sessionid']
        except KeyError:
            session_id = None

        if session_id is None:
            # first request, we send the form
            command_elt['status'] = 'executing'
            session_id = str(uuid.uuid4())
            actions_elt = command_elt.addElement('actions')
            actions_elt['execute'] = 'next'
            actions_elt.addElement('next')
            form = data_form.Form('form', instructions=FORM_INSTRUCTIONS, title=_('Directory subscription'))
            infos = data_form.Field('fixed', value=SUBSCRIBE_TXT)
            desc = data_form.Field('text-single', 'description', label=_(u"Some words about you"))
            form.addField(infos)
            form.addField(desc)
            command_elt.addChild(form.toElement())
        else:
            req_forms = request_cmd.elements(data_form.NS_X_DATA, 'x')
            try:
                req_form = req_forms.next()
                parsed_form = data_form.Form.fromElement(req_form)
                description = parsed_form['description']
            except (StopIteration, KeyError):
                raise ValueError # TODO: properly cancel the command
            self.db.execute('REPLACE INTO directory(jid,description) VALUES (?,?)', (from_.userhost(), description))
            self.db.connection.commit()
            command_elt['status'] = 'completed'
            note_elt = command_elt.addElement('note')
            note_elt['type'] = 'info'
            note_elt.addContent(SUBSCRIBE_DONE)
        command_elt['sessionid'] = session_id
        command_elt['node'] = request_cmd['node']
        self.xmlstream.send(result)

    def onUnsubscribe(self, request):
        result = domish.Element((None, 'iq'))
        result['type'] = 'result'
        result['id'] = request['id']
        result['to'] = request['from']
        from_ = jid.JID(request['from'])
        request_cmd = request.elements(NS_COMMANDS, 'command').next()
        command_elt = result.addElement('command', NS_COMMANDS)
        self.db.execute('DELETE FROM directory WHERE jid=?', (from_.userhost(),))
        self.db.connection.commit()
        command_elt['status'] = 'completed'
        note_elt = command_elt.addElement('note')
        note_elt['type'] = 'info'
        note_elt.addContent(UNSUBSCRIBE_DONE)
        command_elt['node'] = request_cmd['node']
        self.xmlstream.send(result)

    def getDiscoInfo(self, requestor, target, nodeIdentifier=''):
        return [disco.DiscoFeature(NS_SEARCH),
                disco.DiscoIdentity(u"directory", u"user", u"salut"),
                disco.DiscoFeature(NS_COMMANDS),
                ID_CMD_LIST]

    def getDiscoItems(self, requestor, target, nodeIdentifier=''):
        ret = []
        if nodeIdentifier == NS_COMMANDS:
            ret.append(disco.DiscoItem(target, "subscribe", "Subscribe to the directory"))
            ret.append(disco.DiscoItem(target, "unsubscribe", "Unsubscribe from the directory"))
        return ret