#!/usr/bin/python2.5

#

# Copyright 2008 the Melange authors.

#

# Licensed 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

#

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

"""Views for Programs.

"""

__authors__ = [

    '"Sverre Rabbelier" <sverre@rabbelier.nl>',

    '"Lennard de Rijk" <ljvderijk@gmail.com>',

  ]

import os

from django import forms

from django import http

from django.utils import simplejson

from django.utils.translation import ugettext

from soc.logic import allocations

from soc.logic import cleaning

from soc.logic import dicts

from soc.logic.helper import timeline as timeline_helper

from soc.logic.models import host as host_logic

from soc.logic.models import mentor as mentor_logic

from soc.logic.models import organization as org_logic

from soc.logic.models import org_admin as org_admin_logic

from soc.logic.models import org_app as org_app_logic

from soc.logic.models import student_proposal as student_proposal_logic

from soc.logic.models import program as program_logic

from soc.logic.models import student as student_logic

from soc.logic.models.document import logic as document_logic

from soc.views import helper

from soc.views import out_of_band

from soc.views.helper import access

from soc.views.helper import decorators

from soc.views.helper import lists

from soc.views.helper import redirects

from soc.views.helper import widgets

from soc.views.models import presence

from soc.views.models import document as document_view

from soc.views.models import sponsor as sponsor_view

from soc.views.sitemap import sidebar

import soc.logic.models.program

import soc.models.work

class View(presence.View):

  """View methods for the Program model.

  """

  def __init__(self, params=None):

    """Defines the fields and methods required for the base View class

    to provide the user with list, public, create, edit and delete views.

    Params:

      params: a dict with params for this View

    """

    rights = access.Checker(params)

    rights['any_access'] = ['allow']

    rights['show'] = ['allow']

    rights['create'] = [('checkSeeded', ['checkHasActiveRoleForScope', 

        host_logic.logic])]

    rights['edit'] = ['checkIsHostForProgram']

    rights['delete'] = ['checkIsDeveloper']

    rights['assign_slots'] = ['checkIsDeveloper']

    rights['slots'] = ['checkIsDeveloper']

    rights['show_duplicates'] = ['checkIsHostForProgram']

    rights['assigned_proposals'] = ['checkIsHostForProgram']

    new_params = {}

    new_params['logic'] = soc.logic.models.program.logic

    new_params['rights'] = rights

    new_params['scope_view'] = sponsor_view

    new_params['scope_redirect'] = redirects.getCreateRedirect

    new_params['name'] = "Program"

    new_params['sidebar_grouping'] = 'Programs'

    new_params['document_prefix'] = "program"

    new_params['extra_dynaexclude'] = ['timeline', 'org_admin_agreement',

        'mentor_agreement', 'student_agreement']

    patterns = []

    patterns += [

        (r'^%(url_name)s/(?P<access_type>assign_slots)/%(key_fields)s$',

          'soc.views.models.%(module_name)s.assign_slots',

          'Assign slots'),

        (r'^%(url_name)s/(?P<access_type>slots)/%(key_fields)s$',

          'soc.views.models.%(module_name)s.slots',

          'Assign slots (JSON)'),

        (r'^%(url_name)s/(?P<access_type>show_duplicates)/%(key_fields)s$',

          'soc.views.models.%(module_name)s.show_duplicates',

          'Show duplicate slot assignments'),

        (r'^%(url_name)s/(?P<access_type>assigned_proposals)/%(key_fields)s$',

        ]

    new_params['extra_django_patterns'] = patterns

    # TODO add clean field to check for uniqueness in link_id and scope_path

    new_params['create_extra_dynaproperties'] = {

        'description': forms.fields.CharField(widget=helper.widgets.TinyMCE(

            attrs={'rows':10, 'cols':40})),

        'scope_path': forms.CharField(widget=forms.HiddenInput, required=True),

        'workflow': forms.ChoiceField(choices=[('gsoc','Project-based'),

            ('ghop','Task-based')], required=True),

        }

    reference_fields = [

        ('org_admin_agreement_link_id', soc.models.work.Work.link_id.help_text,

         ugettext('Organization Admin Agreement Document link ID')),

        ('mentor_agreement_link_id', soc.models.work.Work.link_id.help_text,

         ugettext('Mentor Agreement Document link ID')),

        ('student_agreement_link_id', soc.models.work.Work.link_id.help_text,

         ugettext('Student Agreement Document link ID')),

        ('home_link_id', soc.models.work.Work.link_id.help_text,

         ugettext('Home page Document link ID')),

        ]

    result = {}

    for key, help_text, label in reference_fields:

      result[key] = widgets.ReferenceField(

          reference_url='document', filter=['__scoped__'],

          filter_fields={'prefix': new_params['document_prefix']},

          required=False, label=label, help_text=help_text)

    result['workflow'] = forms.CharField(widget=widgets.ReadOnlyInput(),

                                         required=True)

    result['clean'] = cleaning.clean_refs(new_params,

                                          [i for i,_,_ in reference_fields])

    new_params['edit_extra_dynaproperties'] = result

    document_references = [

        ('org_admin_agreement_link_id', 'org_admin_agreement',

         lambda x: x.org_admin_agreement),

        ('mentor_agreement_link_id', 'mentor_agreement',

         lambda x: x.mentor_agreement),

        ('student_agreement_link_id', 'student_agreement',

         lambda x: x.student_agreement),

        ]

    new_params['references'] = document_references

    params = dicts.merge(params, new_params, sub_merge=True)

    super(View, self).__init__(params=params)

  @decorators.merge_params

  @decorators.check_access

  def slots(self, request, acces_type, page_name=None, params=None, **kwargs):

    """Returns a JSON object with all orgs allocation.

    Args:

      request: the standard Django HTTP request object

      access_type : the name of the access type which should be checked

      page_name: the page name displayed in templates as page and header title

      params: a dict with params for this View, not used

    """

    program = program_logic.logic.getFromKeyFieldsOr404(kwargs)

    slots = program.slots

    filter = {

          'scope': program,

          'status': 'active',

          }

    query = org_logic.logic.getQueryForFields(filter=filter)

    organizations = org_logic.logic.getAll(query)

    locked_slots = adjusted_slots = {}

    if request.method == 'POST' and 'result' in request.POST:

      result = request.POST['result']

      from_json = simplejson.loads(result)

      locked_slots = dicts.groupDictBy(from_json, 'locked', 'slots')

      adjusted_slots = dicts.groupDictBy(from_json, 'adjustment')

    orgs = {}

    applications = {}

    mentors = {}

    for org in organizations:

      filter = {

          'org': org,

          'status': ['new', 'pending']

          }

      orgs[org.link_id] = org

      query = student_proposal_logic.logic.getQueryForFields(filter=filter)

      proposals = student_proposal_logic.logic.getAll(query)

      applications[org.link_id] = len(proposals)

      mentors[org.link_id] = len([i for i in proposals if i.mentor != None])

    # TODO: Use configuration variables here

    max_slots_per_org = 40

    min_slots_per_org = 2

    iterative = False

    allocator = allocations.Allocator(orgs.keys(), applications, mentors,

                                      slots, max_slots_per_org,

                                      min_slots_per_org, iterative)

    result = allocator.allocate(locked_slots, adjusted_slots)

    data = []

    for link_id, count in result.iteritems():

      org = orgs[link_id]

      data.append({

          'link_id': link_id,

          'slots': count,

          'locked': locked_slots.get(link_id, 0),

          'adjustment': adjusted_slots.get(link_id, 0),

          })

    return self.json(request, data)

  @decorators.merge_params

  @decorators.check_access

  def assignSlots(self, request, access_type, page_name=None,

                  params=None, **kwargs):

    """View that allows to assign slots to orgs.

    """

    from soc.views.models import organization as organization_view

    org_params = organization_view.view.getParams().copy()

    org_params['list_template'] = 'soc/program/allocation/allocation.html'

    org_params['list_heading'] = 'soc/program/allocation/heading.html'

    org_params['list_row'] = 'soc/program/allocation/row.html'

    org_params['list_pagination'] = 'soc/list/no_pagination.html'

    program = program_logic.logic.getFromKeyFieldsOr404(kwargs)

    filter = {

        'scope': program,

        'status': 'active',

        }

    content = lists.getListContent(request, org_params, filter=filter)

    contents = [content]

    return_url =  "http://%(host)s%(index)s" % {

      'host' : os.environ['HTTP_HOST'],

      'index': redirects.getSlotsRedirect(program, params)

      }

    context = {

        'total_slots': program.slots,

        'uses_json': True,

        'uses_slot_allocator': True,

        'return_url': return_url,

        }

    return self._list(request, org_params, contents, page_name, context)

  @decorators.merge_params

  @decorators.check_access

  def showDuplicates(self, request, access_type, page_name=None,

                     params=None, **kwargs):

    """View in which a host can see which students have been assigned multiple slots.

    For params see base.view.Public().

    """

    from django.utils import simplejson

    program_entity = program_logic.logic.getFromKeyFieldsOr404(kwargs)

    context = helper.responses.getUniversalContext(request)

    helper.responses.useJavaScript(context, params['js_uses_all'])

    context['page_name'] = page_name

    # get all orgs for this program who are active and have slots assigned

    fields = {'scope': program_entity,

              'slots >': 0,

              'status': 'active'}

    query = org_logic.logic.getQueryForFields(fields)

    to_json = {

        'nr_of_orgs': query.count(),

        'program_key': program_entity.key().name()}

    json = simplejson.dumps(to_json)

    context['info'] = json

    # TODO(ljvderijk) cache the result of the duplicate calculation

    context['duplicate_cache_content'] = simplejson.dumps({})

    template = 'soc/program/show_duplicates.html'

    return helper.responses.respond(request, template=template, context=context)

  @decorators.merge_params

  @decorators.check_access

  def assignedProposals(self, request, access_type, page_name=None,

                        params=None, filter=None, **kwargs):

    """Returns a JSON dict containing all the proposals that would have

    a slot assigned for a specific set of orgs.

    The request.GET limit and offset determines how many and which

    organizations should be returned.

    For params see base.View.public().

    Returns: JSON object with a collection of orgs and proposals. Containing

             identification information and contact information.

    """

    get_dict = request.GET

    if not (get_dict.get('limit') or get_dict.get('offset')):

      return self.json(request, {})

    try:

      limit = max(0, int(get_dict['limit']))

      offset = max(0, int(get_dict['offset']))

    except ValueError:

      return self.json(request, {})

    program_entity = program_logic.logic.getFromKeyFieldsOr404(kwargs)

    fields = {'scope': program_entity,

              'slots >': 0,

              'status': 'active'}

    org_entities = org_logic.logic.getForFields(fields, limit=limit, offset=offset)

    orgs_data = {}

    proposals_data = {}

    # for each org get the proposals who will be assigned a slot

    for org in org_entities:

      org_data = {'name': org.name}

      fields = {'scope': org,

                'status': 'active',

                'user': org.founder}

      org_admin = org_admin_logic.logic.getForFields(fields, unique=True)

      if org_admin:

        org_data['admin_name'] = org_admin.name()

        org_data['admin_email'] = org_admin.email

      # check if there are already slots taken by this org

      fields = {'org': org,

                'status': 'accepted'}

      query = student_proposal_logic.logic.getQueryForFields(fields)

      test = query.count()

      slots_left_to_assign = max(0, org.slots - query.count())

      if slots_left_to_assign == 0:

        # no slots left so next org

        continue

      # store information about the org

      orgs_data[org.key().name()] = org_data

      fields = {'org': org,

                'mentor !=': None,

                'status': 'pending'}

      order = ['-score']

      # get the the number of proposals that would be assigned a slot

      student_proposal_entities = student_proposal_logic.logic.getForFields(

          fields, limit=slots_left_to_assign, order=order)

      proposal_data = {}

      # store each proposal in the dictionary

      for proposal in student_proposal_entities:

        student_entity = proposal.scope

        proposals_data[proposal.key().name()] = {

            'proposal_title': proposal.title,

            'student_key': student_entity.key().name(),

            'student_name': student_entity.name(),

            'student_contact': student_entity.email,

            'org_key': org.key().name()

            }

      # store it with the other org data

      proposals_data['proposals'] = proposal_data

    # return all the data in JSON format

    data = {'orgs': orgs_data,

            'proposals': proposals_data}

    return self.json(request, data)

  def _editPost(self, request, entity, fields):

    """See base._editPost().

    """

    super(View, self)._editPost(request, entity, fields)

    if not entity:

      # there is no existing entity so create a new timeline

      fields['timeline'] = self._createTimelineForType(fields)

    else:

      # use the timeline from the entity

      fields['timeline'] = entity.timeline

  def _createTimelineForType(self, fields):

    """Creates and stores a timeline model for the given type of program.

    """

    workflow = fields['workflow']

    timeline_logic = program_logic.logic.TIMELINE_LOGIC[workflow]