"""
Tests for engine.filter module.
"""

from engine.filter import skip, strip_tags


class TestStripTags:
    """Tests for strip_tags function."""

    def test_strips_simple_html(self):
        """Basic HTML tags are removed."""
        assert strip_tags("<p>Hello</p>") == "Hello"
        assert strip_tags("<b>Bold</b>") == "Bold"
        assert strip_tags("<em>Italic</em>") == "Italic"

    def test_strips_nested_html(self):
        """Nested HTML tags are handled."""
        assert strip_tags("<div><p>Nested</p></div>") == "Nested"
        assert strip_tags("<span><strong>Deep</strong></span>") == "Deep"

    def test_strips_html_with_attributes(self):
        """HTML with attributes is handled."""
        assert strip_tags('<a href="http://example.com">Link</a>') == "Link"
        assert strip_tags('<img src="test.jpg" alt="test">') == ""

    def test_handles_empty_string(self):
        """Empty string returns empty string."""
        assert strip_tags("") == ""
        assert strip_tags(None) == ""

    def test_handles_plain_text(self):
        """Plain text without tags passes through."""
        assert strip_tags("Plain text") == "Plain text"

    def test_unescapes_html_entities(self):
        """HTML entities are decoded and tags are stripped."""
        assert strip_tags("&nbsp;test") == "test"
        assert strip_tags("Hello &amp; World") == "Hello & World"

    def test_handles_malformed_html(self):
        """Malformed HTML is handled gracefully."""
        assert strip_tags("<p>Unclosed") == "Unclosed"
        assert strip_tags("</p>No start") == "No start"


class TestSkip:
    """Tests for skip function - content filtering."""

    def test_skips_sports_content(self):
        """Sports-related headlines are skipped."""
        assert skip("Football: Team wins championship") is True
        assert skip("NBA Finals Game 7 results") is True
        assert skip("Soccer match ends in draw") is True
        assert skip("Premier League transfer news") is True
        assert skip("Super Bowl halftime show") is True

    def test_skips_vapid_content(self):
        """Vapid/celebrity content is skipped."""
        assert skip("Kim Kardashian's new look") is True
        assert skip("Influencer goes viral") is True
        assert skip("Red carpet best dressed") is True
        assert skip("Celebrity couple splits") is True

    def test_allows_real_news(self):
        """Legitimate news headlines are allowed."""
        assert skip("Scientists discover new planet") is False
        assert skip("Economy grows by 3%") is False
        assert skip("World leaders meet for summit") is False
        assert skip("New technology breakthrough") is False

    def test_case_insensitive(self):
        """Filter is case insensitive."""
        assert skip("FOOTBALL scores") is True
        assert skip("Football SCORES") is True
        assert skip("Kardashian") is True

    def test_word_boundary_matching(self):
        """Word boundary matching works correctly."""
        assert skip("The football stadium") is True
        assert skip("Footballer scores") is False
        assert skip("Footballs on sale") is False


class TestIntegration:
    """Integration tests combining filter functions."""

    def test_full_pipeline(self):
        """Test strip_tags followed by skip."""
        html = '<p><a href="#">Breaking: Football championship final</a></p>'
        text = strip_tags(html)
        assert text == "Breaking: Football championship final"
        assert skip(text) is True