from django.contrib import admin
from django.contrib.admin.options import IncorrectLookupParameters
from django.contrib.admin.views.main import ChangeList
from django.core.paginator import Paginator
from django.template import Context, Template
from django.test import TransactionTestCase

from models import (Child, Parent, Genre, Band, Musician, Group, Quartet,
    Membership, ChordsMusician, ChordsBand, Invitation)


class ChangeListTests(TransactionTestCase):
    def test_select_related_preserved(self):
        """
        Regression test for #10348: ChangeList.get_query_set() shouldn't
        overwrite a custom select_related provided by ModelAdmin.queryset().
        """
        m = ChildAdmin(Child, admin.site)
        cl = ChangeList(MockRequest(), Child, m.list_display, m.list_display_links,
                m.list_filter, m.date_hierarchy, m.search_fields,
                m.list_select_related, m.list_per_page, m.list_editable, m)
        self.assertEqual(cl.query_set.query.select_related, {'parent': {'name': {}}})

    def test_result_list_empty_changelist_value(self):
        """
        Regression test for #14982: EMPTY_CHANGELIST_VALUE should be honored
        for relationship fields
        """
        new_child = Child.objects.create(name='name', parent=None)
        request = MockRequest()
        m = ChildAdmin(Child, admin.site)
        cl = ChangeList(request, Child, m.list_display, m.list_display_links,
                m.list_filter, m.date_hierarchy, m.search_fields,
                m.list_select_related, m.list_per_page, m.list_editable, m)
        cl.formset = None
        template = Template('{% load admin_list %}{% spaceless %}{% result_list cl %}{% endspaceless %}')
        context = Context({'cl': cl})
        table_output = template.render(context)
        row_html = '<tbody><tr class="row1"><td class="action-checkbox"><input type="checkbox" class="action-select" value="1" name="_selected_action" /></td><th><a href="1/">name</a></th><td>(None)</td></tr></tbody>'
        self.assertFalse(table_output.find(row_html) == -1,
            'Failed to find expected row element: %s' % table_output)


    def test_result_list_html(self):
        """
        Verifies that inclusion tag result_list generates a table when with
        default ModelAdmin settings.
        """
        new_parent = Parent.objects.create(name='parent')
        new_child = Child.objects.create(name='name', parent=new_parent)
        request = MockRequest()
        m = ChildAdmin(Child, admin.site)
        cl = ChangeList(request, Child, m.list_display, m.list_display_links,
                m.list_filter, m.date_hierarchy, m.search_fields,
                m.list_select_related, m.list_per_page, m.list_editable, m)
        cl.formset = None
        template = Template('{% load admin_list %}{% spaceless %}{% result_list cl %}{% endspaceless %}')
        context = Context({'cl': cl})
        table_output = template.render(context)
        row_html = '<tbody><tr class="row1"><td class="action-checkbox"><input type="checkbox" class="action-select" value="1" name="_selected_action" /></td><th><a href="1/">name</a></th><td>Parent object</td></tr></tbody>'
        self.assertFalse(table_output.find(row_html) == -1,
            'Failed to find expected row element: %s' % table_output)

    def test_result_list_editable_html(self):
        """
        Regression tests for #11791: Inclusion tag result_list generates a
        table and this checks that the items are nested within the table
        element tags.
        Also a regression test for #13599, verifies that hidden fields
        when list_editable is enabled are rendered in a div outside the
        table.
        """
        new_parent = Parent.objects.create(name='parent')
        new_child = Child.objects.create(name='name', parent=new_parent)
        request = MockRequest()
        m = ChildAdmin(Child, admin.site)

        # Test with list_editable fields
        m.list_display = ['id', 'name', 'parent']
        m.list_display_links = ['id']
        m.list_editable = ['name']
        cl = ChangeList(request, Child, m.list_display, m.list_display_links,
                m.list_filter, m.date_hierarchy, m.search_fields,
                m.list_select_related, m.list_per_page, m.list_editable, m)
        FormSet = m.get_changelist_formset(request)
        cl.formset = FormSet(queryset=cl.result_list)
        template = Template('{% load admin_list %}{% spaceless %}{% result_list cl %}{% endspaceless %}')
        context = Context({'cl': cl})
        table_output = template.render(context)
        # make sure that hidden fields are in the correct place
        hiddenfields_div = '<div class="hiddenfields"><input type="hidden" name="form-0-id" value="1" id="id_form-0-id" /></div>'
        self.assertFalse(table_output.find(hiddenfields_div) == -1,
            'Failed to find hidden fields in: %s' % table_output)
        # make sure that list editable fields are rendered in divs correctly
        editable_name_field = '<input name="form-0-name" value="name" class="vTextField" maxlength="30" type="text" id="id_form-0-name" />'
        self.assertFalse('<td>%s</td>' % editable_name_field == -1,
            'Failed to find "name" list_editable field in: %s' % table_output)

    def test_result_list_editable(self):
        """
        Regression test for #14312: list_editable with pagination
        """

        new_parent = Parent.objects.create(name='parent')
        for i in range(200):
            new_child = Child.objects.create(name='name %s' % i, parent=new_parent)
        request = MockRequest()
        request.GET['p'] = -1 # Anything outside range
        m = ChildAdmin(Child, admin.site)

        # Test with list_editable fields
        m.list_display = ['id', 'name', 'parent']
        m.list_display_links = ['id']
        m.list_editable = ['name']
        self.assertRaises(IncorrectLookupParameters, lambda: \
            ChangeList(request, Child, m.list_display, m.list_display_links,
                    m.list_filter, m.date_hierarchy, m.search_fields,
                    m.list_select_related, m.list_per_page, m.list_editable, m))

    def test_custom_paginator(self):
        new_parent = Parent.objects.create(name='parent')
        for i in range(200):
            new_child = Child.objects.create(name='name %s' % i, parent=new_parent)

        request = MockRequest()
        m = ChildAdmin(Child, admin.site)
        m.list_display = ['id', 'name', 'parent']
        m.list_display_links = ['id']
        m.list_editable = ['name']
        m.paginator = CustomPaginator

        cl = ChangeList(request, Child, m.list_display, m.list_display_links,
                m.list_filter, m.date_hierarchy, m.search_fields,
                m.list_select_related, m.list_per_page, m.list_editable, m)

        cl.get_results(request)
        self.assertIsInstance(cl.paginator, CustomPaginator)

    def test_distinct_for_m2m_in_list_filter(self):
        """
        Regression test for #13902: When using a ManyToMany in list_filter,
        results shouldn't apper more than once. Basic ManyToMany.
        """
        blues = Genre.objects.create(name='Blues')
        band = Band.objects.create(name='B.B. King Review', nr_of_members=11)

        band.genres.add(blues)
        band.genres.add(blues)

        m = BandAdmin(Band, admin.site)
        cl = ChangeList(MockFilteredRequestA(), Band, m.list_display,
                m.list_display_links, m.list_filter, m.date_hierarchy,
                m.search_fields, m.list_select_related, m.list_per_page,
                m.list_editable, m)

        cl.get_results(MockFilteredRequestA())

        # There's only one Group instance
        self.assertEqual(cl.result_count, 1)

    def test_distinct_for_through_m2m_in_list_filter(self):
        """
        Regression test for #13902: When using a ManyToMany in list_filter,
        results shouldn't apper more than once. With an intermediate model.
        """
        lead = Musician.objects.create(name='Vox')
        band = Group.objects.create(name='The Hype')
        Membership.objects.create(group=band, music=lead, role='lead voice')
        Membership.objects.create(group=band, music=lead, role='bass player')

        m = GroupAdmin(Group, admin.site)
        cl = ChangeList(MockFilteredRequestB(), Group, m.list_display,
                m.list_display_links, m.list_filter, m.date_hierarchy,
                m.search_fields, m.list_select_related, m.list_per_page,
                m.list_editable, m)

        cl.get_results(MockFilteredRequestB())

        # There's only one Group instance
        self.assertEqual(cl.result_count, 1)

    def test_distinct_for_inherited_m2m_in_list_filter(self):
        """
        Regression test for #13902: When using a ManyToMany in list_filter,
        results shouldn't apper more than once. Model managed in the
        admin inherits from the one that defins the relationship.
        """
        lead = Musician.objects.create(name='John')
        four = Quartet.objects.create(name='The Beatles')
        Membership.objects.create(group=four, music=lead, role='lead voice')
        Membership.objects.create(group=four, music=lead, role='guitar player')

        m = QuartetAdmin(Quartet, admin.site)
        cl = ChangeList(MockFilteredRequestB(), Quartet, m.list_display,
                m.list_display_links, m.list_filter, m.date_hierarchy,
                m.search_fields, m.list_select_related, m.list_per_page,
                m.list_editable, m)

        cl.get_results(MockFilteredRequestB())

        # There's only one Quartet instance
        self.assertEqual(cl.result_count, 1)

    def test_distinct_for_m2m_to_inherited_in_list_filter(self):
        """
        Regression test for #13902: When using a ManyToMany in list_filter,
        results shouldn't apper more than once. Target of the relationship
        inherits from another.
        """
        lead = ChordsMusician.objects.create(name='Player A')
        three = ChordsBand.objects.create(name='The Chords Trio')
        Invitation.objects.create(band=three, player=lead, instrument='guitar')
        Invitation.objects.create(band=three, player=lead, instrument='bass')

        m = ChordsBandAdmin(ChordsBand, admin.site)
        cl = ChangeList(MockFilteredRequestB(), ChordsBand, m.list_display,
                m.list_display_links, m.list_filter, m.date_hierarchy,
                m.search_fields, m.list_select_related, m.list_per_page,
                m.list_editable, m)

        cl.get_results(MockFilteredRequestB())

        # There's only one ChordsBand instance
        self.assertEqual(cl.result_count, 1)


class ChildAdmin(admin.ModelAdmin):
    list_display = ['name', 'parent']
    def queryset(self, request):
        return super(ChildAdmin, self).queryset(request).select_related("parent__name")

class MockRequest(object):
    GET = {}

class CustomPaginator(Paginator):
    def __init__(self, queryset, page_size, orphans=0, allow_empty_first_page=True):
        super(CustomPaginator, self).__init__(queryset, 5, orphans=2,
            allow_empty_first_page=allow_empty_first_page)


class BandAdmin(admin.ModelAdmin):
    list_filter = ['genres']

class GroupAdmin(admin.ModelAdmin):
    list_filter = ['members']

class QuartetAdmin(admin.ModelAdmin):
    list_filter = ['members']

class ChordsBandAdmin(admin.ModelAdmin):
    list_filter = ['members']

class MockFilteredRequestA(object):
    GET = { 'genres': 1 }

class MockFilteredRequestB(object):
    GET = { 'members': 1 }