import json
import unittest

from mock import Mock
import pydruid.utils.postaggregator as postaggs

import superset.connectors.druid.models as models
from superset.connectors.druid.models import (
    DruidColumn, DruidDatasource, DruidMetric,
)


def mock_metric(metric_name, is_postagg=False):
    metric = Mock()
    metric.metric_name = metric_name
    metric.metric_type = 'postagg' if is_postagg else 'metric'
    return metric


def emplace(metrics_dict, metric_name, is_postagg=False):
    metrics_dict[metric_name] = mock_metric(metric_name, is_postagg)


# Unit tests that can be run without initializing base tests
class DruidFuncTestCase(unittest.TestCase):

    def test_get_filters_ignores_invalid_filter_objects(self):
        filtr = {'col': 'col1', 'op': '=='}
        filters = [filtr]
        self.assertEqual(None, DruidDatasource.get_filters(filters, []))

    def test_get_filters_constructs_filter_in(self):
        filtr = {'col': 'A', 'op': 'in', 'val': ['a', 'b', 'c']}
        res = DruidDatasource.get_filters([filtr], [])
        self.assertIn('filter', res.filter)
        self.assertIn('fields', res.filter['filter'])
        self.assertEqual('or', res.filter['filter']['type'])
        self.assertEqual(3, len(res.filter['filter']['fields']))

    def test_get_filters_constructs_filter_not_in(self):
        filtr = {'col': 'A', 'op': 'not in', 'val': ['a', 'b', 'c']}
        res = DruidDatasource.get_filters([filtr], [])
        self.assertIn('filter', res.filter)
        self.assertIn('type', res.filter['filter'])
        self.assertEqual('not', res.filter['filter']['type'])
        self.assertIn('field', res.filter['filter'])
        self.assertEqual(
            3,
            len(res.filter['filter']['field'].filter['filter']['fields']),
        )

    def test_get_filters_constructs_filter_equals(self):
        filtr = {'col': 'A', 'op': '==', 'val': 'h'}
        res = DruidDatasource.get_filters([filtr], [])
        self.assertEqual('selector', res.filter['filter']['type'])
        self.assertEqual('A', res.filter['filter']['dimension'])
        self.assertEqual('h', res.filter['filter']['value'])

    def test_get_filters_constructs_filter_not_equals(self):
        filtr = {'col': 'A', 'op': '!=', 'val': 'h'}
        res = DruidDatasource.get_filters([filtr], [])
        self.assertEqual('not', res.filter['filter']['type'])
        self.assertEqual(
            'h',
            res.filter['filter']['field'].filter['filter']['value'],
        )

    def test_get_filters_constructs_bounds_filter(self):
        filtr = {'col': 'A', 'op': '>=', 'val': 'h'}
        res = DruidDatasource.get_filters([filtr], [])
        self.assertFalse(res.filter['filter']['lowerStrict'])
        self.assertEqual('A', res.filter['filter']['dimension'])
        self.assertEqual('h', res.filter['filter']['lower'])
        self.assertFalse(res.filter['filter']['alphaNumeric'])
        filtr['op'] = '>'
        res = DruidDatasource.get_filters([filtr], [])
        self.assertTrue(res.filter['filter']['lowerStrict'])
        filtr['op'] = '<='
        res = DruidDatasource.get_filters([filtr], [])
        self.assertFalse(res.filter['filter']['upperStrict'])
        self.assertEqual('h', res.filter['filter']['upper'])
        filtr['op'] = '<'
        res = DruidDatasource.get_filters([filtr], [])
        self.assertTrue(res.filter['filter']['upperStrict'])

    def test_get_filters_constructs_regex_filter(self):
        filtr = {'col': 'A', 'op': 'regex', 'val': '[abc]'}
        res = DruidDatasource.get_filters([filtr], [])
        self.assertEqual('regex', res.filter['filter']['type'])
        self.assertEqual('[abc]', res.filter['filter']['pattern'])
        self.assertEqual('A', res.filter['filter']['dimension'])

    def test_get_filters_composes_multiple_filters(self):
        filtr1 = {'col': 'A', 'op': '!=', 'val': 'y'}
        filtr2 = {'col': 'B', 'op': 'in', 'val': ['a', 'b', 'c']}
        res = DruidDatasource.get_filters([filtr1, filtr2], [])
        self.assertEqual('and', res.filter['filter']['type'])
        self.assertEqual(2, len(res.filter['filter']['fields']))

    def test_get_filters_ignores_in_not_in_with_empty_value(self):
        filtr1 = {'col': 'A', 'op': 'in', 'val': []}
        filtr2 = {'col': 'A', 'op': 'not in', 'val': []}
        res = DruidDatasource.get_filters([filtr1, filtr2], [])
        self.assertEqual(None, res)

    def test_get_filters_constructs_equals_for_in_not_in_single_value(self):
        filtr = {'col': 'A', 'op': 'in', 'val': ['a']}
        res = DruidDatasource.get_filters([filtr], [])
        self.assertEqual('selector', res.filter['filter']['type'])

    def test_get_filters_handles_arrays_for_string_types(self):
        filtr = {'col': 'A', 'op': '==', 'val': ['a', 'b']}
        res = DruidDatasource.get_filters([filtr], [])
        self.assertEqual('a', res.filter['filter']['value'])
        filtr = {'col': 'A', 'op': '==', 'val': []}
        res = DruidDatasource.get_filters([filtr], [])
        self.assertEqual('', res.filter['filter']['value'])

    def test_get_filters_handles_none_for_string_types(self):
        filtr = {'col': 'A', 'op': '==', 'val': None}
        res = DruidDatasource.get_filters([filtr], [])
        self.assertEqual('', res.filter['filter']['value'])

    def test_get_filters_extracts_values_in_quotes(self):
        filtr = {'col': 'A', 'op': 'in', 'val': ['  "a" ']}
        res = DruidDatasource.get_filters([filtr], [])
        self.assertEqual('a', res.filter['filter']['value'])

    def test_get_filters_converts_strings_to_num(self):
        filtr = {'col': 'A', 'op': 'in', 'val': ['6']}
        res = DruidDatasource.get_filters([filtr], ['A'])
        self.assertEqual(6, res.filter['filter']['value'])
        filtr = {'col': 'A', 'op': '==', 'val': '6'}
        res = DruidDatasource.get_filters([filtr], ['A'])
        self.assertEqual(6, res.filter['filter']['value'])

    def test_run_query_no_groupby(self):
        client = Mock()
        from_dttm = Mock()
        to_dttm = Mock()
        from_dttm.replace = Mock(return_value=from_dttm)
        to_dttm.replace = Mock(return_value=to_dttm)
        from_dttm.isoformat = Mock(return_value='from')
        to_dttm.isoformat = Mock(return_value='to')
        timezone = 'timezone'
        from_dttm.tzname = Mock(return_value=timezone)
        ds = DruidDatasource(datasource_name='datasource')
        metric1 = DruidMetric(metric_name='metric1')
        metric2 = DruidMetric(metric_name='metric2')
        ds.metrics = [metric1, metric2]
        col1 = DruidColumn(column_name='col1')
        col2 = DruidColumn(column_name='col2')
        ds.columns = [col1, col2]
        all_metrics = []
        post_aggs = ['some_agg']
        ds._metrics_and_post_aggs = Mock(return_value=(all_metrics, post_aggs))
        groupby = []
        metrics = ['metric1']
        ds.get_having_filters = Mock(return_value=[])
        client.query_builder = Mock()
        client.query_builder.last_query = Mock()
        client.query_builder.last_query.query_dict = {'mock': 0}
        # no groupby calls client.timeseries
        ds.run_query(
            groupby, metrics, None, from_dttm,
            to_dttm, client=client, filter=[], row_limit=100,
        )
        self.assertEqual(0, len(client.topn.call_args_list))
        self.assertEqual(0, len(client.groupby.call_args_list))
        self.assertEqual(1, len(client.timeseries.call_args_list))
        # check that there is no dimensions entry
        called_args = client.timeseries.call_args_list[0][1]
        self.assertNotIn('dimensions', called_args)
        self.assertIn('post_aggregations', called_args)
        # restore functions

    def test_run_query_single_groupby(self):
        client = Mock()
        from_dttm = Mock()
        to_dttm = Mock()
        from_dttm.replace = Mock(return_value=from_dttm)
        to_dttm.replace = Mock(return_value=to_dttm)
        from_dttm.isoformat = Mock(return_value='from')
        to_dttm.isoformat = Mock(return_value='to')
        timezone = 'timezone'
        from_dttm.tzname = Mock(return_value=timezone)
        ds = DruidDatasource(datasource_name='datasource')
        metric1 = DruidMetric(metric_name='metric1')
        metric2 = DruidMetric(metric_name='metric2')
        ds.metrics = [metric1, metric2]
        col1 = DruidColumn(column_name='col1')
        col2 = DruidColumn(column_name='col2')
        ds.columns = [col1, col2]
        all_metrics = ['metric1']
        post_aggs = ['some_agg']
        ds._metrics_and_post_aggs = Mock(return_value=(all_metrics, post_aggs))
        groupby = ['col1']
        metrics = ['metric1']
        ds.get_having_filters = Mock(return_value=[])
        client.query_builder.last_query.query_dict = {'mock': 0}
        # client.topn is called twice
        ds.run_query(
            groupby, metrics, None, from_dttm, to_dttm, row_limit=100,
            client=client, order_desc=True, filter=[],
        )
        self.assertEqual(2, len(client.topn.call_args_list))
        self.assertEqual(0, len(client.groupby.call_args_list))
        self.assertEqual(0, len(client.timeseries.call_args_list))
        # check that there is no dimensions entry
        called_args_pre = client.topn.call_args_list[0][1]
        self.assertNotIn('dimensions', called_args_pre)
        self.assertIn('dimension', called_args_pre)
        called_args = client.topn.call_args_list[1][1]
        self.assertIn('dimension', called_args)
        self.assertEqual('col1', called_args['dimension'])
        # not order_desc
        client = Mock()
        client.query_builder.last_query.query_dict = {'mock': 0}
        ds.run_query(
            groupby, metrics, None, from_dttm, to_dttm, client=client,
            order_desc=False, filter=[], row_limit=100,
        )
        self.assertEqual(0, len(client.topn.call_args_list))
        self.assertEqual(1, len(client.groupby.call_args_list))
        self.assertEqual(0, len(client.timeseries.call_args_list))
        self.assertIn('dimensions', client.groupby.call_args_list[0][1])
        self.assertEqual(['col1'], client.groupby.call_args_list[0][1]['dimensions'])
        # order_desc but timeseries and dimension spec
        spec = {'spec': 1}
        spec_json = json.dumps(spec)
        col3 = DruidColumn(column_name='col3', dimension_spec_json=spec_json)
        ds.columns.append(col3)
        groupby = ['col3']
        client = Mock()
        client.query_builder.last_query.query_dict = {'mock': 0}
        ds.run_query(
            groupby, metrics, None, from_dttm, to_dttm,
            client=client, order_desc=True, timeseries_limit=5,
            filter=[], row_limit=100,
        )
        self.assertEqual(0, len(client.topn.call_args_list))
        self.assertEqual(2, len(client.groupby.call_args_list))
        self.assertEqual(0, len(client.timeseries.call_args_list))
        self.assertIn('dimensions', client.groupby.call_args_list[0][1])
        self.assertIn('dimensions', client.groupby.call_args_list[1][1])
        self.assertEqual([spec], client.groupby.call_args_list[0][1]['dimensions'])
        self.assertEqual([spec], client.groupby.call_args_list[1][1]['dimensions'])

    def test_run_query_multiple_groupby(self):
        client = Mock()
        from_dttm = Mock()
        to_dttm = Mock()
        from_dttm.replace = Mock(return_value=from_dttm)
        to_dttm.replace = Mock(return_value=to_dttm)
        from_dttm.isoformat = Mock(return_value='from')
        to_dttm.isoformat = Mock(return_value='to')
        timezone = 'timezone'
        from_dttm.tzname = Mock(return_value=timezone)
        ds = DruidDatasource(datasource_name='datasource')
        metric1 = DruidMetric(metric_name='metric1')
        metric2 = DruidMetric(metric_name='metric2')
        ds.metrics = [metric1, metric2]
        col1 = DruidColumn(column_name='col1')
        col2 = DruidColumn(column_name='col2')
        ds.columns = [col1, col2]
        all_metrics = []
        post_aggs = ['some_agg']
        ds._metrics_and_post_aggs = Mock(return_value=(all_metrics, post_aggs))
        groupby = ['col1', 'col2']
        metrics = ['metric1']
        ds.get_having_filters = Mock(return_value=[])
        client.query_builder = Mock()
        client.query_builder.last_query = Mock()
        client.query_builder.last_query.query_dict = {'mock': 0}
        # no groupby calls client.timeseries
        ds.run_query(
            groupby, metrics, None, from_dttm,
            to_dttm, client=client, row_limit=100,
            filter=[],
        )
        self.assertEqual(0, len(client.topn.call_args_list))
        self.assertEqual(1, len(client.groupby.call_args_list))
        self.assertEqual(0, len(client.timeseries.call_args_list))
        # check that there is no dimensions entry
        called_args = client.groupby.call_args_list[0][1]
        self.assertIn('dimensions', called_args)
        self.assertEqual(['col1', 'col2'], called_args['dimensions'])

    def test_get_post_agg_returns_correct_agg_type(self):
        get_post_agg = DruidDatasource.get_post_agg
        # javascript PostAggregators
        function = 'function(field1, field2) { return field1 + field2; }'
        conf = {
            'type': 'javascript',
            'name': 'postagg_name',
            'fieldNames': ['field1', 'field2'],
            'function': function,
        }
        postagg = get_post_agg(conf)
        self.assertTrue(isinstance(postagg, models.JavascriptPostAggregator))
        self.assertEqual(postagg.name, 'postagg_name')
        self.assertEqual(postagg.post_aggregator['type'], 'javascript')
        self.assertEqual(postagg.post_aggregator['fieldNames'], ['field1', 'field2'])
        self.assertEqual(postagg.post_aggregator['name'], 'postagg_name')
        self.assertEqual(postagg.post_aggregator['function'], function)
        # Quantile
        conf = {
            'type': 'quantile',
            'name': 'postagg_name',
            'probability': '0.5',
        }
        postagg = get_post_agg(conf)
        self.assertTrue(isinstance(postagg, postaggs.Quantile))
        self.assertEqual(postagg.name, 'postagg_name')
        self.assertEqual(postagg.post_aggregator['probability'], '0.5')
        # Quantiles
        conf = {
            'type': 'quantiles',
            'name': 'postagg_name',
            'probabilities': '0.4,0.5,0.6',
        }
        postagg = get_post_agg(conf)
        self.assertTrue(isinstance(postagg, postaggs.Quantiles))
        self.assertEqual(postagg.name, 'postagg_name')
        self.assertEqual(postagg.post_aggregator['probabilities'], '0.4,0.5,0.6')
        # FieldAccess
        conf = {
            'type': 'fieldAccess',
            'name': 'field_name',
        }
        postagg = get_post_agg(conf)
        self.assertTrue(isinstance(postagg, postaggs.Field))
        self.assertEqual(postagg.name, 'field_name')
        # constant
        conf = {
            'type': 'constant',
            'value': 1234,
            'name': 'postagg_name',
        }
        postagg = get_post_agg(conf)
        self.assertTrue(isinstance(postagg, postaggs.Const))
        self.assertEqual(postagg.name, 'postagg_name')
        self.assertEqual(postagg.post_aggregator['value'], 1234)
        # hyperUniqueCardinality
        conf = {
            'type': 'hyperUniqueCardinality',
            'name': 'unique_name',
        }
        postagg = get_post_agg(conf)
        self.assertTrue(isinstance(postagg, postaggs.HyperUniqueCardinality))
        self.assertEqual(postagg.name, 'unique_name')
        # arithmetic
        conf = {
            'type': 'arithmetic',
            'fn': '+',
            'fields': ['field1', 'field2'],
            'name': 'postagg_name',
        }
        postagg = get_post_agg(conf)
        self.assertTrue(isinstance(postagg, postaggs.Postaggregator))
        self.assertEqual(postagg.name, 'postagg_name')
        self.assertEqual(postagg.post_aggregator['fn'], '+')
        self.assertEqual(postagg.post_aggregator['fields'], ['field1', 'field2'])
        # custom post aggregator
        conf = {
            'type': 'custom',
            'name': 'custom_name',
            'stuff': 'more_stuff',
        }
        postagg = get_post_agg(conf)
        self.assertTrue(isinstance(postagg, models.CustomPostAggregator))
        self.assertEqual(postagg.name, 'custom_name')
        self.assertEqual(postagg.post_aggregator['stuff'], 'more_stuff')

    def test_find_postaggs_for_returns_postaggs_and_removes(self):
        find_postaggs_for = DruidDatasource.find_postaggs_for
        postagg_names = set(['pa2', 'pa3', 'pa4', 'm1', 'm2', 'm3', 'm4'])

        metrics = {}
        for i in range(1, 6):
            emplace(metrics, 'pa' + str(i), True)
            emplace(metrics, 'm' + str(i), False)
        postagg_list = find_postaggs_for(postagg_names, metrics)
        self.assertEqual(3, len(postagg_list))
        self.assertEqual(4, len(postagg_names))
        expected_metrics = ['m1', 'm2', 'm3', 'm4']
        expected_postaggs = set(['pa2', 'pa3', 'pa4'])
        for postagg in postagg_list:
            expected_postaggs.remove(postagg.metric_name)
        for metric in expected_metrics:
            postagg_names.remove(metric)
        self.assertEqual(0, len(expected_postaggs))
        self.assertEqual(0, len(postagg_names))

    def test_recursive_get_fields(self):
        conf = {
            'type': 'quantile',
            'fieldName': 'f1',
            'field': {
                'type': 'custom',
                'fields': [{
                    'type': 'fieldAccess',
                    'fieldName': 'f2',
                }, {
                    'type': 'fieldAccess',
                    'fieldName': 'f3',
                }, {
                    'type': 'quantiles',
                    'fieldName': 'f4',
                    'field': {
                        'type': 'custom',
                    },
                }, {
                    'type': 'custom',
                    'fields': [{
                        'type': 'fieldAccess',
                        'fieldName': 'f5',
                    }, {
                        'type': 'fieldAccess',
                        'fieldName': 'f2',
                        'fields': [{
                            'type': 'fieldAccess',
                            'fieldName': 'f3',
                        }, {
                            'type': 'fieldIgnoreMe',
                            'fieldName': 'f6',
                        }],
                    }],
                }],
            },
        }
        fields = DruidDatasource.recursive_get_fields(conf)
        expected = set(['f1', 'f2', 'f3', 'f4', 'f5'])
        self.assertEqual(5, len(fields))
        for field in fields:
            expected.remove(field)
        self.assertEqual(0, len(expected))

    def test_metrics_and_post_aggs_tree(self):
        metrics = ['A', 'B', 'm1', 'm2']
        metrics_dict = {}
        for i in range(ord('A'), ord('K') + 1):
            emplace(metrics_dict, chr(i), True)
        for i in range(1, 10):
            emplace(metrics_dict, 'm' + str(i), False)

        def depends_on(index, fields):
            dependents = fields if isinstance(fields, list) else [fields]
            metrics_dict[index].json_obj = {'fieldNames': dependents}

        depends_on('A', ['m1', 'D', 'C'])
        depends_on('B', ['B', 'C', 'E', 'F', 'm3'])
        depends_on('C', ['H', 'I'])
        depends_on('D', ['m2', 'm5', 'G', 'C'])
        depends_on('E', ['H', 'I', 'J'])
        depends_on('F', ['J', 'm5'])
        depends_on('G', ['m4', 'm7', 'm6', 'A'])
        depends_on('H', ['A', 'm4', 'I'])
        depends_on('I', ['H', 'K'])
        depends_on('J', 'K')
        depends_on('K', ['m8', 'm9'])
        all_metrics, postaggs = DruidDatasource.metrics_and_post_aggs(
            metrics, metrics_dict)
        expected_metrics = set(all_metrics)
        self.assertEqual(9, len(all_metrics))
        for i in range(1, 10):
            expected_metrics.remove('m' + str(i))
        self.assertEqual(0, len(expected_metrics))
        self.assertEqual(11, len(postaggs))
        for i in range(ord('A'), ord('K') + 1):
            del postaggs[chr(i)]
        self.assertEqual(0, len(postaggs))

    def test_metrics_and_post_aggs(self):
        """
        Test generation of metrics and post-aggregations from an initial list
        of superset metrics (which may include the results of either). This
        primarily tests that specifying a post-aggregator metric will also
        require the raw aggregation of the associated druid metric column.
        """
        metrics_dict = {
            'unused_count': DruidMetric(
                metric_name='unused_count',
                verbose_name='COUNT(*)',
                metric_type='count',
                json=json.dumps({'type': 'count', 'name': 'unused_count'}),
            ),
            'some_sum': DruidMetric(
                metric_name='some_sum',
                verbose_name='SUM(*)',
                metric_type='sum',
                json=json.dumps({'type': 'sum', 'name': 'sum'}),
            ),
            'a_histogram': DruidMetric(
                metric_name='a_histogram',
                verbose_name='APPROXIMATE_HISTOGRAM(*)',
                metric_type='approxHistogramFold',
                json=json.dumps(
                    {'type': 'approxHistogramFold', 'name': 'a_histogram'},
                ),
            ),
            'aCustomMetric': DruidMetric(
                metric_name='aCustomMetric',
                verbose_name='MY_AWESOME_METRIC(*)',
                metric_type='aCustomType',
                json=json.dumps(
                    {'type': 'customMetric', 'name': 'aCustomMetric'},
                ),
            ),
            'quantile_p95': DruidMetric(
                metric_name='quantile_p95',
                verbose_name='P95(*)',
                metric_type='postagg',
                json=json.dumps({
                    'type': 'quantile',
                    'probability': 0.95,
                    'name': 'p95',
                    'fieldName': 'a_histogram',
                }),
            ),
            'aCustomPostAgg': DruidMetric(
                metric_name='aCustomPostAgg',
                verbose_name='CUSTOM_POST_AGG(*)',
                metric_type='postagg',
                json=json.dumps({
                    'type': 'customPostAgg',
                    'name': 'aCustomPostAgg',
                    'field': {
                        'type': 'fieldAccess',
                        'fieldName': 'aCustomMetric',
                    },
                }),
            ),
        }

        metrics = ['some_sum']
        all_metrics, post_aggs = DruidDatasource.metrics_and_post_aggs(
            metrics, metrics_dict)

        assert all_metrics == ['some_sum']
        assert post_aggs == {}

        metrics = ['quantile_p95']
        all_metrics, post_aggs = DruidDatasource.metrics_and_post_aggs(
            metrics, metrics_dict)

        result_postaggs = set(['quantile_p95'])
        assert all_metrics == ['a_histogram']
        assert set(post_aggs.keys()) == result_postaggs

        metrics = ['aCustomPostAgg']
        all_metrics, post_aggs = DruidDatasource.metrics_and_post_aggs(
            metrics, metrics_dict)

        result_postaggs = set(['aCustomPostAgg'])
        assert all_metrics == ['aCustomMetric']
        assert set(post_aggs.keys()) == result_postaggs