# Patchwork - automated patch tracking system
# Copyright (C) 2008 Jeremy Kerr <jk@ozlabs.org>
#
# This file is part of the Patchwork package.
#
# Patchwork 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.
#
# Patchwork 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 Patchwork; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA


from patchwork.models import Person, State
from django.utils.safestring import mark_safe
from django.utils.html import escape
from django.contrib.auth.models import User

class Filter(object):
    def __init__(self, filters):
        self.filters = filters
        self.applied = False
        self.forced = False

    def name(self):
        """The 'name' of the filter, to be displayed in the filter UI"""
        return self.name

    def condition(self):
        """The current condition of the filter, to be displayed in the
           filter UI"""
        return self.key

    def key(self):
        """The key for this filter, to appear in the querystring. A key of
           None will remove the param=ley pair from the querystring."""
        return None

    def set_status(self, *kwargs):
        """Views can call this to force a specific filter status. For example,
           a user's todo page needs to setup the delegate filter to show
           that user's delegated patches"""
        pass

    def parse(self, dict):
        if self.param not in dict.keys():
            return
        self._set_key(dict[self.param])

    def url_without_me(self):
        return self.filters.querystring_without_filter(self)

    def form_function(self):
        return 'function(form) { return "unimplemented" }'

    def form(self):
        if self.forced:
            return mark_safe('<input type="hidden" value="%s">%s' % (self.param,
                        self.condition()))
            return self.condition()
        return self._form()

    def kwargs(self):
        return {}

    def __str__(self):
        return '%s: %s' % (self.name, self.kwargs())


class SubmitterFilter(Filter):
    param = 'submitter'
    def __init__(self, filters):
        super(SubmitterFilter, self).__init__(filters)
        self.name = 'Submitter'
        self.person = None
        self.person_match = None

    def _set_key(self, str):
        self.person = None
        self.person_match = None
        submitter_id = None
        try:
            submitter_id = int(str)
        except ValueError:
            pass
        except:
            return

        if submitter_id:
            self.person = Person.objects.get(id = int(str))
            self.applied = True
            return


        people = Person.objects.filter(name__icontains = str)

        if not people:
            return

        self.person_match = str
        self.applied = True

    def kwargs(self):
        if self.person:
            user = self.person.user
            if user:
                return {'submitter__in':
                    Person.objects.filter(user = user).values('pk').query}
            return {'submitter': self.person}

        if self.person_match:
            return {'submitter__name__icontains': self.person_match}
        return {}

    def condition(self):
        if self.person:
            return self.person.name
        elif self.person_match:
            return self.person_match
        return ''

    def _form(self):
        name = ''
        if self.person:
            name = self.person.name
        return mark_safe(('<input onKeyUp="submitter_field_change(this)" ' +
                'name="submitter" id="submitter_input" ' +
                        'value="%s">&nbsp;' % escape(name)) +
                '<select id="submitter_select" ' +
                'disabled="true"></select>')

    def key(self):
        if self.person:
            return self.person.id
        return self.person_match

class StateFilter(Filter):
    param = 'state'
    any_key = '*'
    action_req_str = 'Action Required'

    def __init__(self, filters):
        super(StateFilter, self).__init__(filters)
        self.name = 'State'
        self.state = None
        self.applied = True

    def _set_key(self, str):
        self.state = None

        if str == self.any_key:
            self.applied = False
            return

        try:
            self.state = State.objects.get(id=int(str))
        except:
            return

        self.applied = True

    def kwargs(self):
        if self.state is not None:
            return {'state': self.state}
        else:
            return {'state__in': \
                        State.objects.filter(action_required = True) \
                            .values('pk').query}

    def condition(self):
        if self.state:
            return self.state.name
        return self.action_req_str

    def key(self):
        if self.state is not None:
            return self.state.id
        if not self.applied:
            return '*'
        return None

    def _form(self):
        str = '<select name="%s">' % self.param

        selected = ''
        if not self.applied:
            selected = 'selected'
        str += '<option %s value="%s">any</option>' % (selected, self.any_key)

        selected = ''
        if self.applied and self.state == None:
            selected = 'selected'
        str += '<option %s value="">%s</option>' % \
               (selected, self.action_req_str)

        for state in State.objects.all():
            selected = ''
            if self.state and self.state == state:
                selected = ' selected="true"'

            str += '<option value="%d" %s>%s</option>' % \
                (state.id, selected, state.name)
        str += '</select>'
        return mark_safe(str);

    def form_function(self):
        return 'function(form) { return form.x.value }'

    def url_without_me(self):
        qs = self.filters.querystring_without_filter(self)
        if qs != '?':
            qs += '&'
        return qs + '%s=%s' % (self.param, self.any_key)

class SearchFilter(Filter):
    param = 'q'
    def __init__(self, filters):
        super(SearchFilter, self).__init__(filters)
        self.name = 'Search'
        self.param = 'q'
        self.search = None

    def _set_key(self, str):
        str = str.strip()
        if str == '':
            return
        self.search = str
        self.applied = True

    def kwargs(self):
        return {'name__icontains': self.search}

    def condition(self):
        return self.search

    def key(self):
        return self.search

    def _form(self):
        value = ''
        if self.search:
            value = escape(self.search)
        return mark_safe('<input name="%s" value="%s">' %\
                (self.param, value))

    def form_function(self):
        return mark_safe('function(form) { return form.x.value }')

class ArchiveFilter(Filter):
    param = 'archive'
    def __init__(self, filters):
        super(ArchiveFilter, self).__init__(filters)
        self.name = 'Archived'
        self.archive_state = False
        self.applied = True
        self.param_map = {
            True: 'true',
            False: '',
            None:  'both'
        }
        self.description_map = {
            True: 'Yes',
            False: 'No',
            None: 'Both'
        }

    def _set_key(self, str):
        self.archive_state = False
        self.applied = True
        for (k, v) in self.param_map.iteritems():
            if str == v:
                self.archive_state = k
        if self.archive_state == None:
            self.applied = False

    def kwargs(self):
        if self.archive_state == None:
            return {}
        return {'archived': self.archive_state}

    def condition(self):
        return self.description_map[self.archive_state]

    def key(self):
        if self.archive_state == False:
            return None
        return self.param_map[self.archive_state]

    def _form(self):
        s = ''
        for b in [False, True, None]:
            label = self.description_map[b]
            selected = ''
            if self.archive_state == b:
                selected = 'checked="true"'
            s += ('<input type="radio" name="%(param)s" ' + \
                   '%(selected)s value="%(value)s">%(label)s' + \
                   '&nbsp;&nbsp;&nbsp;&nbsp;') % \
                    {'label': label,
                     'param': self.param,
                     'selected': selected,
                     'value': self.param_map[b]
                    }
        return mark_safe(s)

    def url_without_me(self):
        qs = self.filters.querystring_without_filter(self)
        if qs != '?':
            qs += '&'
        return qs + 'archive=both'


class DelegateFilter(Filter):
    param = 'delegate'
    no_delegate_key = '-'
    no_delegate_str = 'Nobody'
    AnyDelegate = 1

    def __init__(self, filters):
        super(DelegateFilter, self).__init__(filters)
        self.name = 'Delegate'
        self.param = 'delegate'
        self.delegate = None

    def _set_key(self, str):
        if str == self.no_delegate_key:
            self.applied = True
            self.delegate = None
            return

        applied = False
        try:
            self.delegate = User.objects.get(id = str)
            self.applied = True
        except:
            pass

    def kwargs(self):
        if not self.applied:
            return {}
        return {'delegate': self.delegate}

    def condition(self):
        if self.delegate:
            return self.delegate.get_profile().name()
        return self.no_delegate_str

    def _form(self):
        delegates = User.objects.filter(userprofile__maintainer_projects =
                self.filters.project)

        str = '<select name="delegate">'

        selected = ''
        if not self.applied:
            selected = 'selected'

        str += '<option %s value="">------</option>' % selected

        selected = ''
        if self.applied and self.delegate is None:
            selected = 'selected'

        str += '<option %s value="%s">%s</option>' % \
                (selected, self.no_delegate_key, self.no_delegate_str)

        for d in delegates:
            selected = ''
            if d == self.delegate:
                selected = ' selected'

            str += '<option %s value="%s">%s</option>' % (selected,
                    d.id, d.get_profile().name())
        str += '</select>'

        return mark_safe(str)

    def key(self):
        if self.delegate:
            return self.delegate.id
        if self.applied:
            return self.no_delegate_key
        return None

    def set_status(self, *args, **kwargs):
        if 'delegate' in kwargs:
            self.applied = self.forced = True
            self.delegate = kwargs['delegate']
        if self.AnyDelegate in args:
            self.applied = False
            self.forced = True

filterclasses = [SubmitterFilter, \
                 StateFilter,
                 SearchFilter,
                 ArchiveFilter,
                 DelegateFilter]

class Filters:

    def __init__(self, request):
        self._filters = map(lambda c: c(self), filterclasses)
        self.dict = request.GET
        self.project = None

        for f in self._filters:
            f.parse(self.dict)

    def set_project(self, project):
        self.project = project

    def filter_conditions(self):
        kwargs = {}
        for f in self._filters:
            if f.applied:
                kwargs.update(f.kwargs())
        return kwargs

    def apply(self, queryset):
        kwargs = self.filter_conditions()
        if not kwargs:
            return queryset
        return queryset.filter(**kwargs)

    def params(self):
        return [ (f.param, f.key()) for f in self._filters \
                if f.key() is not None ]

    def querystring(self, remove = None):
        params = dict(self.params())

        for (k, v) in self.dict.iteritems():
            if k not in params:
                params[k] = v

        if remove is not None:
            if remove.param in params.keys():
                del params[remove.param]

        return '?' + '&'.join(['%s=%s' % x for x in params.iteritems()])

    def querystring_without_filter(self, filter):
        return self.querystring(filter)

    def applied_filters(self):
        return filter(lambda x: x.applied, self._filters)

    def available_filters(self):
        return self._filters

    def set_status(self, filterclass, *args, **kwargs):
        for f in self._filters:
            if isinstance(f, filterclass):
                f.set_status(*args, **kwargs)
                return