# Copyright (C) 2018  Lars Wirzenius
# 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/>.


import unittest

import muck


class MemoryStoreTests(unittest.TestCase):

    def setUp(self):
        self.ms = muck.MemoryStore()
        self.meta1 = {
            'id': 'id-1',
            'rev': 'rev-1',
        }
        self.res1 = {
            'foo': 'bar',
        }

    def test_is_initially_empty(self):
        self.assertEqual(len(self.ms), 0)
        self.assertEqual(self.ms.as_dict(), {})
        self.assertFalse('foo' in self.ms)

    def test_creates_resource(self):
        chg = muck.CreateChange(meta=self.meta1, res=self.res1)
        self.ms.change(chg)

        rid = self.meta1['id']
        self.assertEqual(len(self.ms), 1)
        self.assertTrue(rid in self.ms)
        self.assertEqual(self.ms[rid], (self.meta1, self.res1))
        self.assertEqual(
            self.ms.as_dict(),
            {
                rid: (self.meta1, self.res1),
            })

    def test_wont_create_resource_with_conflicting_id(self):
        chg = muck.CreateChange(meta=self.meta1, res=self.res1)
        self.ms.change(chg)
        with self.assertRaises(muck.Error):
            self.ms.change(chg)

    def test_updates_resource(self):
        meta2 = dict(self.meta1)
        meta2['rev'] = 'rev-2'

        res2 = dict(self.res1)
        res2['foo'] = 'yo'

        create = muck.CreateChange(meta=self.meta1, res=self.res1)
        update = muck.UpdateChange(meta=meta2, res=res2)

        rid = self.meta1['id']

        self.ms.change(create)
        self.ms.change(update)
        self.assertEqual(len(self.ms), 1)
        self.assertEqual(
            self.ms.as_dict(),
            {
                rid: (meta2, res2),
            })

    def test_refuses_to_update_resource_that_didnt_exist(self):
        update = muck.UpdateChange(meta=self.meta1, res=self.res1)
        with self.assertRaises(muck.Error):
            self.ms.change(update)

    def test_deletes_resource(self):
        create = muck.CreateChange(meta=self.meta1, res=self.res1)
        delete = muck.DeleteChange(meta=self.meta1)

        self.ms.change(create)
        self.ms.change(delete)
        self.assertEqual(len(self.ms), 0)
        self.assertEqual(self.ms.as_dict(), {})

    def test_refuses_to_delete_resource_that_doesnt_exist(self):
        delete = muck.DeleteChange(meta=self.meta1)
        with self.assertRaises(muck.Error):
            self.ms.change(delete)

    def test_finds_nothing_for_impossible_condition(self):
        chg = muck.CreateChange(meta=self.meta1, res=self.res1)
        self.ms.change(chg)

        cond = [
            {
                'where': 'meta',
                'field': 'id',
                'pattern': 'does-not-exist',
                'op': '==',
            },
        ]
        hits = self.ms.search(cond)
        self.assertEqual(hits, [])

    def test_finds_matching_resources_in_meta(self):
        chg = muck.CreateChange(meta=self.meta1, res=self.res1)
        self.ms.change(chg)

        rid = self.meta1['id']
        cond = [
            {
                'where': 'meta',
                'field': 'id',
                'pattern': rid,
                'op': '==',
            },
        ]
        hits = self.ms.search(cond)
        self.assertEqual(hits, [rid])

    def test_finds_matching_resources_in_data(self):
        chg = muck.CreateChange(meta=self.meta1, res=self.res1)
        self.ms.change(chg)

        rid = self.meta1['id']
        cond = [
            {
                'where': 'data',
                'field': 'foo',
                'pattern': self.res1['foo'],
                'op': '==',
            },
        ]
        hits = self.ms.search(cond)
        self.assertEqual(hits, [rid])

    def test_finds_matches_in_list(self):
        self.res1['foo'] = ['bar', 'yo']
        chg = muck.CreateChange(meta=self.meta1, res=self.res1)
        self.ms.change(chg)

        rid = self.meta1['id']
        cond = [
            {
                'where': 'data',
                'field': 'foo',
                'pattern': 'yo',
                'op': '==',
            },
        ]
        hits = self.ms.search(cond)
        self.assertEqual(hits, [rid])

    def test_finds_ge(self):
        self.res1['foo'] = ['bar', 'yo']
        chg = muck.CreateChange(meta=self.meta1, res=self.res1)
        self.ms.change(chg)

        rid = self.meta1['id']
        cond = [
            {
                'where': 'data',
                'field': 'foo',
                'pattern': 'yo',
                'op': '>=',
            },
        ]
        hits = self.ms.search(cond)
        self.assertEqual(hits, [rid])

    def test_finds_le(self):
        self.res1['foo'] = ['bar', 'yo']
        chg = muck.CreateChange(meta=self.meta1, res=self.res1)
        self.ms.change(chg)

        rid = self.meta1['id']
        cond = [
            {
                'where': 'data',
                'field': 'foo',
                'pattern': 'bar',
                'op': '<=',
            },
        ]
        hits = self.ms.search(cond)
        self.assertEqual(hits, [rid])