from django.test import TestCase
from django.test.utils import override_settings

from haystack.utils import (
    _lookup_identifier_method,
    get_facet_field_name,
    get_identifier,
    log,
)
from haystack.utils.highlighting import Highlighter
from test_haystack.core.models import MockModel


class GetIdentifierTestCase(TestCase):
    def test_get_facet_field_name(self):
        self.assertEqual(get_facet_field_name("id"), "id")
        self.assertEqual(get_facet_field_name("django_id"), "django_id")
        self.assertEqual(get_facet_field_name("django_ct"), "django_ct")
        self.assertEqual(get_facet_field_name("author"), "author_exact")
        self.assertEqual(get_facet_field_name("author_exact"), "author_exact_exact")


class GetFacetFieldNameTestCase(TestCase):
    fixtures = ["base_data"]

    def test_get_identifier(self):
        self.assertEqual(get_identifier("core.mockmodel.1"), "core.mockmodel.1")

        # Valid object.
        mock = MockModel.objects.get(pk=1)
        self.assertEqual(get_identifier(mock), "core.mockmodel.1")

    @override_settings(
        HAYSTACK_IDENTIFIER_METHOD="test_haystack.core.custom_identifier.get_identifier_method"
    )
    def test_haystack_identifier_method(self):
        # The custom implementation returns the MD-5 hash of the key value by
        # default:
        get_identifier = _lookup_identifier_method()
        self.assertEqual(get_identifier("a.b.c"), "553f764f7b436175c0387e22b4a19213")

        # … but it also supports a custom override mechanism which would
        # definitely fail with the default implementation:
        class custom_id_class:
            def get_custom_haystack_id(self):
                return "CUSTOM"

        self.assertEqual(get_identifier(custom_id_class()), "CUSTOM")

    @override_settings(
        HAYSTACK_IDENTIFIER_METHOD="test_haystack.core.custom_identifier.not_there"
    )
    def test_haystack_identifier_method_bad_path(self):
        self.assertRaises(AttributeError, _lookup_identifier_method)

    @override_settings(HAYSTACK_IDENTIFIER_METHOD="core.not_there.not_there")
    def test_haystack_identifier_method_bad_module(self):
        self.assertRaises(ImportError, _lookup_identifier_method)


class HighlighterTestCase(TestCase):
    def setUp(self):
        super().setUp()
        self.document_1 = "This is a test of the highlightable words detection. This is only a test. Were this an actual emergency, your text would have exploded in mid-air."
        self.document_2 = (
            "The content of words in no particular order causes nothing to occur."
        )
        self.document_3 = "%s %s" % (self.document_1, self.document_2)

    def test_find_highlightable_words(self):
        highlighter = Highlighter("this test")
        highlighter.text_block = self.document_1
        self.assertEqual(
            highlighter.find_highlightable_words(),
            {"this": [0, 53, 79], "test": [10, 68]},
        )

        # We don't stem for now.
        highlighter = Highlighter("highlight tests")
        highlighter.text_block = self.document_1
        self.assertEqual(
            highlighter.find_highlightable_words(), {"highlight": [22], "tests": []}
        )

        # Ignore negated bits.
        highlighter = Highlighter("highlight -test")
        highlighter.text_block = self.document_1
        self.assertEqual(highlighter.find_highlightable_words(), {"highlight": [22]})

    def test_find_window(self):
        # The query doesn't matter for this method, so ignore it.
        highlighter = Highlighter("")
        highlighter.text_block = self.document_1

        # No query.
        self.assertEqual(highlighter.find_window({}), (0, 200))

        # Nothing found.
        self.assertEqual(
            highlighter.find_window({"highlight": [], "tests": []}), (0, 200)
        )

        # Simple cases.
        self.assertEqual(
            highlighter.find_window({"highlight": [0], "tests": [100]}), (0, 200)
        )
        self.assertEqual(
            highlighter.find_window({"highlight": [99], "tests": [199]}), (99, 299)
        )
        self.assertEqual(
            highlighter.find_window({"highlight": [0], "tests": [201]}), (0, 200)
        )
        self.assertEqual(
            highlighter.find_window({"highlight": [203], "tests": [120]}), (120, 320)
        )
        self.assertEqual(
            highlighter.find_window({"highlight": [], "tests": [100]}), (100, 300)
        )
        self.assertEqual(
            highlighter.find_window({"highlight": [0], "tests": [80], "moof": [120]}),
            (0, 200),
        )

        # Simple cases, with an outlier far outside the window.
        self.assertEqual(
            highlighter.find_window({"highlight": [0], "tests": [100, 450]}), (0, 200)
        )
        self.assertEqual(
            highlighter.find_window({"highlight": [100], "tests": [220, 450]}),
            (100, 300),
        )
        self.assertEqual(
            highlighter.find_window({"highlight": [100], "tests": [350, 450]}),
            (350, 550),
        )
        self.assertEqual(
            highlighter.find_window(
                {"highlight": [100], "tests": [220], "moof": [450]}
            ),
            (100, 300),
        )

        # Density checks.
        self.assertEqual(
            highlighter.find_window({"highlight": [0], "tests": [100, 180, 450]}),
            (0, 200),
        )
        self.assertEqual(
            highlighter.find_window(
                {"highlight": [0, 40], "tests": [100, 200, 220, 450]}
            ),
            (40, 240),
        )
        self.assertEqual(
            highlighter.find_window(
                {"highlight": [0, 40], "tests": [100, 200, 220], "moof": [450]}
            ),
            (40, 240),
        )
        self.assertEqual(
            highlighter.find_window(
                {
                    "highlight": [0, 40],
                    "tests": [100, 200, 220],
                    "moof": [294, 299, 450],
                }
            ),
            (100, 300),
        )

    def test_render_html(self):
        highlighter = Highlighter("this test")
        highlighter.text_block = self.document_1
        self.assertEqual(
            highlighter.render_html({"this": [0, 53, 79], "test": [10, 68]}, 0, 200),
            '<span class="highlighted">This</span> is a <span class="highlighted">test</span> of the highlightable words detection. <span class="highlighted">This</span> is only a <span class="highlighted">test</span>. Were <span class="highlighted">this</span> an actual emergency, your text would have exploded in mid-air.',
        )

        highlighter.text_block = self.document_2
        self.assertEqual(
            highlighter.render_html({"this": [0, 53, 79], "test": [10, 68]}, 0, 200),
            "The content of words in no particular order causes nothing to occur.",
        )

        highlighter.text_block = self.document_3
        self.assertEqual(
            highlighter.render_html({"this": [0, 53, 79], "test": [10, 68]}, 0, 200),
            '<span class="highlighted">This</span> is a <span class="highlighted">test</span> of the highlightable words detection. <span class="highlighted">This</span> is only a <span class="highlighted">test</span>. Were <span class="highlighted">this</span> an actual emergency, your text would have exploded in mid-air. The content of words in no particular order causes no...',
        )

        highlighter = Highlighter("content detection")
        highlighter.text_block = self.document_3
        self.assertEqual(
            highlighter.render_html({"content": [151], "detection": [42]}, 42, 242),
            '...<span class="highlighted">detection</span>. This is only a test. Were this an actual emergency, your text would have exploded in mid-air. The <span class="highlighted">content</span> of words in no particular order causes nothing to occur.',
        )

        self.assertEqual(
            highlighter.render_html({"content": [151], "detection": [42]}, 42, 200),
            '...<span class="highlighted">detection</span>. This is only a test. Were this an actual emergency, your text would have exploded in mid-air. The <span class="highlighted">content</span> of words in no particular order causes no...',
        )

        # One term found within another term.
        highlighter = Highlighter("this is")
        highlighter.text_block = self.document_1
        self.assertEqual(
            highlighter.render_html(
                {"this": [0, 53, 79], "is": [2, 5, 55, 58, 81]}, 0, 200
            ),
            '<span class="highlighted">This</span> <span class="highlighted">is</span> a test of the highlightable words detection. <span class="highlighted">This</span> <span class="highlighted">is</span> only a test. Were <span class="highlighted">this</span> an actual emergency, your text would have exploded in mid-air.',
        )

        # Regression for repetition in the regular expression.
        highlighter = Highlighter("i++")
        highlighter.text_block = "Foo is i++ in most cases."
        self.assertEqual(
            highlighter.render_html({"i++": [7]}, 0, 200),
            'Foo is <span class="highlighted">i++</span> in most cases.',
        )
        highlighter = Highlighter("i**")
        highlighter.text_block = "Foo is i** in most cases."
        self.assertEqual(
            highlighter.render_html({"i**": [7]}, 0, 200),
            'Foo is <span class="highlighted">i**</span> in most cases.',
        )
        highlighter = Highlighter("i..")
        highlighter.text_block = "Foo is i.. in most cases."
        self.assertEqual(
            highlighter.render_html({"i..": [7]}, 0, 200),
            'Foo is <span class="highlighted">i..</span> in most cases.',
        )
        highlighter = Highlighter("i??")
        highlighter.text_block = "Foo is i?? in most cases."
        self.assertEqual(
            highlighter.render_html({"i??": [7]}, 0, 200),
            'Foo is <span class="highlighted">i??</span> in most cases.',
        )

        # Regression for highlighting already highlighted HTML terms.
        highlighter = Highlighter("span")
        highlighter.text_block = "A span in spam makes html in a can."
        self.assertEqual(
            highlighter.render_html({"span": [2]}, 0, 200),
            'A <span class="highlighted">span</span> in spam makes html in a can.',
        )

        highlighter = Highlighter("highlight")
        highlighter.text_block = "A span in spam makes highlighted html in a can."
        self.assertEqual(
            highlighter.render_html({"highlight": [21]}, 0, 200),
            'A span in spam makes <span class="highlighted">highlight</span>ed html in a can.',
        )

    def test_highlight(self):
        highlighter = Highlighter("this test")
        self.assertEqual(
            highlighter.highlight(self.document_1),
            '<span class="highlighted">This</span> is a <span class="highlighted">test</span> of the highlightable words detection. <span class="highlighted">This</span> is only a <span class="highlighted">test</span>. Were <span class="highlighted">this</span> an actual emergency, your text would have exploded in mid-air.',
        )
        self.assertEqual(
            highlighter.highlight(self.document_2),
            "The content of words in no particular order causes nothing to occur.",
        )
        self.assertEqual(
            highlighter.highlight(self.document_3),
            '<span class="highlighted">This</span> is a <span class="highlighted">test</span> of the highlightable words detection. <span class="highlighted">This</span> is only a <span class="highlighted">test</span>. Were <span class="highlighted">this</span> an actual emergency, your text would have exploded in mid-air. The content of words in no particular order causes no...',
        )

        highlighter = Highlighter("this test", html_tag="div", css_class=None)
        self.assertEqual(
            highlighter.highlight(self.document_1),
            "<div>This</div> is a <div>test</div> of the highlightable words detection. <div>This</div> is only a <div>test</div>. Were <div>this</div> an actual emergency, your text would have exploded in mid-air.",
        )
        self.assertEqual(
            highlighter.highlight(self.document_2),
            "The content of words in no particular order causes nothing to occur.",
        )
        self.assertEqual(
            highlighter.highlight(self.document_3),
            "<div>This</div> is a <div>test</div> of the highlightable words detection. <div>This</div> is only a <div>test</div>. Were <div>this</div> an actual emergency, your text would have exploded in mid-air. The content of words in no particular order causes no...",
        )

        highlighter = Highlighter("content detection")
        self.assertEqual(
            highlighter.highlight(self.document_1),
            '...<span class="highlighted">detection</span>. This is only a test. Were this an actual emergency, your text would have exploded in mid-air.',
        )
        self.assertEqual(
            highlighter.highlight(self.document_2),
            '...<span class="highlighted">content</span> of words in no particular order causes nothing to occur.',
        )
        self.assertEqual(
            highlighter.highlight(self.document_3),
            '...<span class="highlighted">detection</span>. This is only a test. Were this an actual emergency, your text would have exploded in mid-air. The <span class="highlighted">content</span> of words in no particular order causes nothing to occur.',
        )

        highlighter = Highlighter("content detection", max_length=100)
        self.assertEqual(
            highlighter.highlight(self.document_1),
            '...<span class="highlighted">detection</span>. This is only a test. Were this an actual emergency, your text would have exploded in mid-...',
        )
        self.assertEqual(
            highlighter.highlight(self.document_2),
            '...<span class="highlighted">content</span> of words in no particular order causes nothing to occur.',
        )
        self.assertEqual(
            highlighter.highlight(self.document_3),
            'This is a test of the highlightable words <span class="highlighted">detection</span>. This is only a test. Were this an actual emerge...',
        )


class LoggingFacadeTestCase(TestCase):
    def test_everything_noops_if_settings_are_off(self):
        with self.settings(HAYSTACK_LOGGING=False):
            l = log.LoggingFacade(None)
            l.error()

    def test_uses_provided_logger_if_logging_is_on(self):
        with self.settings(HAYSTACK_LOGGING=True):
            l = log.LoggingFacade(None)
            try:
                l.error()
            except AttributeError:
                pass

    def test_uses_provided_logger_by_default(self):
        class Logger:
            def __init__(self):
                self.was_called = False

            def error(self):
                self.was_called = True

        l = log.LoggingFacade(Logger())
        self.assertFalse(l.was_called, msg="sanity check")
        l.error()
        self.assertTrue(l.was_called)