#!/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.

"""Params related methods.
"""

__authors__ = [
  '"Sverre Rabbelier" <sverre@rabbelier.nl>',
  ]


from django import forms
from django.utils.translation import ugettext_lazy

from soc.logic import cleaning
from soc.logic import dicts
from soc.models import linkable
from soc.views import helper
from soc.views.helper import access
from soc.views.helper import dynaform
from soc.views.helper import redirects


DEF_LIST_DESCRIPTION_FMT = ugettext_lazy(
    'List of %(name_plural)s in Google Open Source Programs.')

DEF_CREATE_INSTRUCTION_MSG_FMT = ugettext_lazy(
      'Please use this form to select a %(name).')

DEF_SUBMIT_MSG_PARAM_NAME = 's'
DEF_SUBMIT_MSG_PROFILE_SAVED = 0


def constructParams(params):
  """Constructs a new params dictionary based on params.

  Params usage:
    The params dictionary is passed to getCreateForm and getEditForm,
    see their docstring on how they use it.

    rights: The rights value is merged with a default rights
      dictionary and then used as rights value.
    url_name: The url_name value is used in constructing several
      redirects as the first part of the url.
    module_name: The module_name value is used in constructing the
      location of several templates. It is expected that it matches
      the part after "/templates/soc/" for this View.
    name_plural: The name_plural argument is provided to the
      LIST_DESCRIPTION when constructing the list_description field.
    extra_dynainclude: The extra_dynainclude value is used when
      constructing the create_dynainclude value.
    extra_dynaexclude: The extra_dynaexclude value is used when
      constructing the create_dynaexclude value.
    logic: The logic value is used as argument to clean_new_link_id
      from the cleaning module.
  """

  logic = params['logic']

  rights = {}
  rights['unspecified'] = []
  rights['any_access'] = [access.checkIsLoggedIn]
  rights['show'] = [access.checkIsUser]
  rights['create'] = [access.checkIsDeveloper]
  rights['edit'] = [access.checkIsDeveloper]
  rights['delete'] = [access.checkIsDeveloper]
  rights['list'] = [access.checkIsDeveloper]

  if 'rights' in params:
    rights = dicts.merge(params['rights'], rights)

  new_params = {}
  new_params['rights'] = rights
  new_params['scope_logic'] = logic.getScopeLogic()

  if 'name_short' not in params:
    params['name_short'] = params['name']

  if 'name_plural' not in params:
    params['name_plural'] = params['name'] + 's'

  if 'module_name' not in params:
    params['module_name'] = params['name_short'].replace(' ', '_').lower()

  if 'url_name' not in params:
    params['url_name'] = params['module_name']

  # Do not expand edit_redirect to allow it to be overriden without suffix
  new_params['edit_redirect'] = '/%(url_name)s/edit/%(suffix)s'
  new_params['missing_redirect'] = '/%(url_name)s/create' % params
  new_params['delete_redirect'] = '/%(url_name)s/list' % params
  new_params['invite_redirect'] = '/request/list'

  new_params['sidebar'] = None
  new_params['sidebar_defaults'] = [
      ('/%s/create', 'New %(name)s', 'create'),
      ('/%s/list', 'List %(name_plural)s', 'list'),
      ]
  new_params['sidebar_additional'] = []

  new_params['key_fields_prefix'] = []
  new_params['link_id_arg_pattern'] = linkable.LINK_ID_ARG_PATTERN
  new_params['link_id_pattern_core'] = linkable.LINK_ID_PATTERN_CORE
  new_params['scope_path_pattern'] = getScopePattern(params)

  new_params['django_patterns'] = None
  new_params['extra_django_patterns'] = []
  new_params['django_patterns_defaults'] = [
      (r'^%(url_name)s/(?P<access_type>show)/%(key_fields)s$',
          'soc.views.models.%(module_name)s.public', 'Show %(name_short)s'),
      (r'^%(url_name)s/(?P<access_type>create)$',
          'soc.views.models.%(module_name)s.create', 'Create %(name_short)s'),
      (r'^%(url_name)s/(?P<access_type>create)/%(scope)s$',
          'soc.views.models.%(module_name)s.create', 'Create %(name_short)s'),
      (r'^%(url_name)s/(?P<access_type>delete)/%(key_fields)s$',
          'soc.views.models.%(module_name)s.delete', 'Delete %(name_short)s'),
      (r'^%(url_name)s/(?P<access_type>edit)/%(key_fields)s$',
          'soc.views.models.%(module_name)s.edit', 'Edit %(name_short)s'),
      (r'^%(url_name)s/(?P<access_type>list)$',
          'soc.views.models.%(module_name)s.list', 'List %(name_plural)s'),
      ]

  if not params.get('no_create_with_key_fields'):
    new_params['django_patterns_defaults'] += [
        (r'^%(url_name)s/(?P<access_type>create)/%(key_fields)s$',
        'soc.views.models.%(module_name)s.create', 'Create %(name_short)s')]

  new_params['public_template'] = 'soc/%(module_name)s/public.html' % params
  new_params['create_template'] = 'soc/models/edit.html'
  new_params['edit_template'] = 'soc/models/edit.html'
  new_params['list_template'] = 'soc/models/list.html'
  new_params['invite_template'] = 'soc/models/invite.html'

  new_params['error_public'] = 'soc/%(module_name)s/error.html' % params
  new_params['error_edit'] = 'soc/%(module_name)s/error.html'  % params

  new_params['list_main'] = 'soc/list/main.html'
  new_params['list_pagination'] = 'soc/list/pagination.html'
  new_params['list_row'] = 'soc/%(module_name)s/list/row.html' % params
  new_params['list_heading'] = 'soc/%(module_name)s/list/heading.html' % params

  new_params['list_action'] = (redirects.getEditRedirect, params)
  new_params['list_params'] = {
      'list_action': 'action',
      'list_description': 'description',
      'list_main': 'main',
      'list_pagination': 'pagination',
      'list_row': 'row',
      'list_heading': 'heading',
      }

  new_params['list_description'] = DEF_LIST_DESCRIPTION_FMT % params
  new_params['save_message'] = [ugettext_lazy('Profile saved.')]
  new_params['submit_msg_param_name'] = DEF_SUBMIT_MSG_PARAM_NAME
  new_params['edit_params'] = {
      DEF_SUBMIT_MSG_PARAM_NAME: DEF_SUBMIT_MSG_PROFILE_SAVED,
      }

  new_params['dynabase'] = helper.forms.BaseForm

  create_dynafields = {
      'clean_link_id': cleaning.clean_new_link_id(logic),
      'clean_feed_url': cleaning.clean_feed_url,
      }
  create_dynafields.update(params.get('create_extra_dynafields', {}))

  new_params['create_dynainclude'] = [] + params.get('extra_dynainclude', [])
  new_params['create_dynaexclude'] = ['scope', 'scope_path'] + \
      params.get('extra_dynaexclude', [])
  new_params['create_dynafields'] = create_dynafields

  edit_dynafields = {
      'clean_link_id': cleaning.clean_link_id,
      'link_id': forms.CharField(widget=helper.widgets.ReadOnlyInput()),
      }
  edit_dynafields.update(params.get('edit_extra_dynafields', {}))

  new_params['edit_dynainclude'] = None
  new_params['edit_dynaexclude'] = None
  new_params['edit_dynafields'] = edit_dynafields

  params = dicts.merge(params, new_params)

  # These need to be constructed separately, because they require
  # parameters that can be defined either in params, or new_params.
  if not 'create_form' in params:
    params['create_form'] = getCreateForm(params, logic.getModel())

  if not 'edit_form' in params:
    params['edit_form'] = getEditForm(params, params['create_form'])

  if not 'key_fields_pattern' in params:
    params['key_fields_pattern'] = getKeyFieldsPattern(params)

  return params


def getCreateForm(params, model):
  """Constructs a new CreateForm using params.

  Params usage:
    dynabase: The dynabase value is used as the base argument to
      dynaform.newDynaForm.
    logic: The logic value is used to get the model argument to newDynaForm.
    create_dynainclude: same as dynabase, but as dynainclude argument
    create_dynaexclude: same as dynabase, but as dynaexclude argument
    create_dynafields: same as dynabase, but as dynafields argument
  """

  create_form = dynaform.newDynaForm(
    dynabase = params['dynabase'],
    dynamodel = model,
    dynainclude = params['create_dynainclude'],
    dynaexclude = params['create_dynaexclude'],
    dynafields = params['create_dynafields'],
    )

  return create_form


def getEditForm(params, base_form):
  """Constructs a new EditForm using params.

  Params usage:
    create_form: The dynabase value is used as the dynaform argument
      to dyanform.extendDynaForm.
    edit_dynainclude: same as create_form, but as dynainclude argument
    edit_dynaexclude: same as create_form, but as dynaexclude argument
    edit_dynafields: same as create_form, but as dynafields argument
  """

  edit_form = dynaform.extendDynaForm(
    dynaform = base_form,
    dynainclude = params['edit_dynainclude'],
    dynaexclude = params['edit_dynaexclude'],
    dynafields = params['edit_dynafields'],
    )

  return edit_form


def getKeyFieldsPattern(params):
  """Returns the Django pattern for this View's entity.

  Params usage:
    key_fields_prefix: The key_fields_prefix value is used as the
      first part of the returned pattern.
  """

  names = params['logic'].getKeyFieldNames()
  patterns = params['key_fields_prefix']

  for name in names:
    if name == 'scope_path':
      pattern = params['scope_path_pattern']
    else:
      pattern = r'(?P<%s>%s)' % (name, linkable.LINK_ID_PATTERN_CORE)
    patterns.append(pattern)

  result = '/'.join(patterns)
  return result


def getScopePattern(params):
  """Returns the Scope pattern for this entity.
  """

  logic = params['logic']
  depth = logic.getScopeDepth()
  if depth is None:
    return linkable.SCOPE_PATH_ARG_PATTERN

  regexps = [linkable.LINK_ID_PATTERN_CORE for i in range(depth)]
  regexp = '/'.join(regexps)
  return r'(?P<scope_path>%s)' % regexp
