# This file is part of the MapProxy project.
# Copyright (C) 2011 Omniscale <http://omniscale.de>
#
# 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.

from __future__ import with_statement

import re
import os
import time
import random

from nose.plugins.skip import SkipTest

from mapproxy.cache.couchdb import CouchDBCache, CouchDBMDTemplate
from mapproxy.cache.tile import Tile
from mapproxy.grid import tile_grid
from mapproxy.test.image import create_tmp_image_buf

from mapproxy.test.unit.test_cache_tile import TileCacheTestBase

from nose.tools import assert_almost_equal, eq_

tile_image = create_tmp_image_buf((256, 256), color='blue')
tile_image2 = create_tmp_image_buf((256, 256), color='red')

class TestCouchDBCache(TileCacheTestBase):
    always_loads_metadata = True
    def setup(self):
        if not os.environ.get('MAPPROXY_TEST_COUCHDB'):
            raise SkipTest()

        couch_address = os.environ['MAPPROXY_TEST_COUCHDB']
        db_name = 'mapproxy_test_%d' % random.randint(0, 100000)

        TileCacheTestBase.setup(self)

        md_template = CouchDBMDTemplate({'row': '{{y}}', 'tile_column': '{{x}}',
            'zoom': '{{level}}', 'time': '{{timestamp}}', 'coord': '{{wgs_tile_centroid}}'})
        self.cache = CouchDBCache(couch_address, db_name,
            file_ext='png', tile_grid=tile_grid(3857, name='global-webmarcator'),
            md_template=md_template)

    def teardown(self):
        import requests
        requests.delete(self.cache.couch_url)
        TileCacheTestBase.teardown(self)

    def test_store_bulk_with_overwrite(self):
        tile = self.create_tile((0, 0, 4))
        self.create_cached_tile(tile)

        assert self.cache.is_cached(Tile((0, 0, 4)))
        loaded_tile = Tile((0, 0, 4))
        assert self.cache.load_tile(loaded_tile)
        assert loaded_tile.source_buffer().read() == tile.source_buffer().read()

        assert not self.cache.is_cached(Tile((1, 0, 4)))

        tiles = [self.create_another_tile((x, 0, 4)) for x in range(2)]
        assert self.cache.store_tiles(tiles)

        assert self.cache.is_cached(Tile((0, 0, 4)))
        loaded_tile = Tile((0, 0, 4))
        assert self.cache.load_tile(loaded_tile)
        # check that tile is overwritten
        assert loaded_tile.source_buffer().read() != tile.source_buffer().read()
        assert loaded_tile.source_buffer().read() == tiles[0].source_buffer().read()

    def test_double_remove(self):
        tile = self.create_tile()
        self.create_cached_tile(tile)
        assert self.cache.remove_tile(tile)
        assert self.cache.remove_tile(tile)


class TestCouchDBMDTemplate(object):
    def test_empty(self):
        template = CouchDBMDTemplate({})
        doc = template.doc(Tile((0, 0, 1)), tile_grid(4326))

        assert_almost_equal(doc['timestamp'], time.time(), 2)

    def test_fixed_values(self):
        template = CouchDBMDTemplate({'hello': 'world', 'foo': 123})
        doc = template.doc(Tile((0, 0, 1)), tile_grid(4326))

        assert_almost_equal(doc['timestamp'], time.time(), 2)
        eq_(doc['hello'], 'world')
        eq_(doc['foo'], 123)

    def test_template_values(self):
        template = CouchDBMDTemplate({'row': '{{y}}', 'tile_column': '{{x}}',
            'zoom': '{{level}}', 'time': '{{timestamp}}', 'coord': '{{wgs_tile_centroid}}',
            'datetime': '{{utc_iso}}', 'coord_webmerc': '{{tile_centroid}}'})
        doc = template.doc(Tile((1, 0, 2)), tile_grid(3857))

        assert_almost_equal(doc['time'], time.time(), 2)
        assert 'timestamp' not in doc
        eq_(doc['row'], 0)
        eq_(doc['tile_column'], 1)
        eq_(doc['zoom'], 2)
        assert_almost_equal(doc['coord'][0], -45.0)
        assert_almost_equal(doc['coord'][1], -79.17133464081945)
        assert_almost_equal(doc['coord_webmerc'][0], -5009377.085697311)
        assert_almost_equal(doc['coord_webmerc'][1], -15028131.257091932)
        assert re.match('20\d\d-\d\d-\d\dT\d\d:\d\d:\d\dZ', doc['datetime']), doc['datetime']