from tests.compat import unittest
from tests.test_levenshtein import TestFindNearMatchesLevenshteinBase
from fuzzysearch.common import Match, get_best_match_in_group, group_matches
from tests.test_substitutions_only import TestSubstitionsOnlyBase
from tests.test_generic_search import TestGenericSearchBase

try:
    from fuzzysearch._generic_search import \
        c_find_near_matches_generic_linear_programming as c_fnm_generic_lp, \
        c_find_near_matches_generic_ngrams as c_fnm_generic_ngrams
except ImportError:
    pass
else:
    class TestGenericSearchLpAsLevenshtein(TestFindNearMatchesLevenshteinBase,
                                           unittest.TestCase):
        def search(self, subsequence, sequence, max_l_dist):
            return [
                get_best_match_in_group(group)
                for group in group_matches(
                    c_fnm_generic_lp(subsequence.encode('ascii'),
                                     sequence.encode('ascii'),
                                     max_l_dist, max_l_dist,
                                     max_l_dist, max_l_dist)
                )
            ]

    class TestGenericSearchNgramsAsLevenshtein(
        TestFindNearMatchesLevenshteinBase, unittest.TestCase):
        def search(self, subsequence, sequence, max_l_dist):
            return [
                get_best_match_in_group(group)
                for group in group_matches(
                    c_fnm_generic_ngrams(subsequence.encode('ascii'),
                                         sequence.encode('ascii'),
                                         max_l_dist, max_l_dist,
                                         max_l_dist, max_l_dist)
                )
            ]


    class TestGenericSearchLpAsSubstitutionsOnly(TestSubstitionsOnlyBase,
                                                 unittest.TestCase):
        def search(self, subsequence, sequence, max_subs):
            return list(
                c_fnm_generic_lp(subsequence.encode('ascii'),
                                 sequence.encode('ascii'),
                                 max_subs, 0, 0, max_subs)
            )


    class TestGenericSearchNgramsAsSubstitutionsOnly(TestSubstitionsOnlyBase,
                                                     unittest.TestCase):
        def search(self, subsequence, sequence, max_subs):
            return [
                get_best_match_in_group(group)
                for group in group_matches(
                    c_fnm_generic_ngrams(subsequence.encode('ascii'),
                                         sequence.encode('ascii'),
                                         max_subs, 0, 0, max_subs)
                )
        ]

        @unittest.skip("Ngrams search doesn't return overlapping matches")
        def test_double_first_item(self):
            return super(TestGenericSearchNgramsAsSubstitutionsOnly,
                         self).test_double_first_item()


    class TestGenericSearchLp(TestGenericSearchBase, unittest.TestCase):
        def search(self, pattern, sequence, max_subs, max_ins, max_dels,
                   max_l_dist=None):
            return list(c_fnm_generic_lp(pattern.encode('ascii'),
                                         sequence.encode('ascii'),
                                         max_subs, max_ins,
                                         max_dels, max_l_dist))

        def expectedOutcomes(self, search_result, expected_outcomes,
                             *args, **kw):
            self.assertEqual(search_result, expected_outcomes, *args, **kw)

        def test_double_first_item_two_results(self):
            # sequence = 'abcdefg'
            # pattern = 'bde'
            self.assertEqual(
                self.search('def', 'abcddefg', 0, 1, 0),
                [Match(start=3, end=7, dist=1), Match(start=4, end=7, dist=0)],
            )

        def test_missing_second_item_complex(self):
            self.assertEqual(
                self.search('bde', 'abcdefg', 1, 1, 1, 1),
                [Match(start=1, end=5, dist=1),
                 Match(start=2, end=5, dist=1),
                 Match(start=3, end=5, dist=1)],
            )

            self.assertTrue(
                set([
                    Match(start=1, end=5, dist=1),
                    Match(start=2, end=5, dist=1),
                    Match(start=3, end=5, dist=1),
                    Match(start=2, end=5, dist=3),
                ]).issubset(set(
                    self.search('bde', 'abcdefg', 1, 1, 1, 3),
                ))
            )

    class TestGenericSearchNgrams(TestGenericSearchBase, unittest.TestCase):
        def search(self, pattern, sequence, max_subs, max_ins, max_dels,
                   max_l_dist=None):
            return [
                get_best_match_in_group(group)
                for group in group_matches(
                    c_fnm_generic_ngrams(pattern.encode('ascii'),
                                         sequence.encode('ascii'),
                                         max_subs, max_ins,
                                         max_dels, max_l_dist)
                )
            ]

        def expectedOutcomes(self, search_result, expected_outcomes,
                             *args, **kw):
            best_from_groups = [
                get_best_match_in_group(group)
                for group in group_matches(search_result)
            ]
            self.assertEqual(search_result, best_from_groups, *args, **kw)

        def test_missing_second_item_complex(self):
            self.assertTrue(
                set(self.search('bde', 'abcdefg', 1, 1, 1, 1)).issubset([
                    Match(start=1, end=5, dist=1),
                    Match(start=2, end=5, dist=1),
                    Match(start=3, end=5, dist=1),
                ])
            )