"""Tests for analyzer modules."""

from repohealth.analyzers.bus_factor import BusFactorCalculator
from repohealth.analyzers.risk_analyzer import RiskAnalyzer
from repohealth.models.file_stats import FileAnalysis


class TestBusFactorCalculator:
    """Tests for BusFactorCalculator."""

    def setup_method(self):
        """Set up test fixtures."""
        self.calculator = BusFactorCalculator()

    def test_calculate_gini_equal_distribution(self):
        """Test Gini coefficient with equal distribution."""
        values = [10, 10, 10, 10]
        gini = self.calculator.calculate_gini(values)

        assert gini == 0.0

    def test_calculate_gini_unequal_distribution(self):
        """Test Gini coefficient with unequal distribution."""
        values = [100, 0, 0, 0]
        gini = self.calculator.calculate_gini(values)

        assert gini > 0.5
        assert gini <= 1.0

    def test_calculate_gini_single_value(self):
        """Test Gini coefficient with single value."""
        values = [100]
        gini = self.calculator.calculate_gini(values)

        assert gini == 0.0

    def test_calculate_gini_empty_list(self):
        """Test Gini coefficient with empty list."""
        gini = self.calculator.calculate_gini([])

        assert gini == 0.0

    def test_calculate_file_bus_factor_single_author(self):
        """Test bus factor with single author."""
        analysis = FileAnalysis(
            path="test.py",
            total_commits=10,
            author_commits={"author@example.com": 10}
        )

        bus_factor = self.calculator.calculate_file_bus_factor(analysis)

        assert bus_factor == 1.0

    def test_calculate_file_bus_factor_multiple_authors(self):
        """Test bus factor with multiple authors."""
        analysis = FileAnalysis(
            path="test.py",
            total_commits=10,
            author_commits={"a@x.com": 5, "b@x.com": 5}
        )

        bus_factor = self.calculator.calculate_file_bus_factor(analysis)

        assert bus_factor > 1.0

    def test_calculate_file_bus_factor_no_commits(self):
        """Test bus factor with no commits."""
        analysis = FileAnalysis(
            path="test.py",
            total_commits=0,
            author_commits={}
        )

        bus_factor = self.calculator.calculate_file_bus_factor(analysis)

        assert bus_factor == 1.0

    def test_calculate_repository_bus_factor(self):
        """Test repository-level bus factor calculation."""
        files = [
            FileAnalysis(
                path="file1.py",
                total_commits=10,
                author_commits={"a@x.com": 10}
            ),
            FileAnalysis(
                path="file2.py",
                total_commits=10,
                author_commits={"a@x.com": 5, "b@x.com": 5}
            )
        ]

        bus_factor = self.calculator.calculate_repository_bus_factor(files)

        assert bus_factor > 1.0

    def test_assign_risk_levels(self):
        """Test risk level assignment."""
        files = [
            FileAnalysis(
                path="critical.py",
                total_commits=10,
                author_commits={"a@x.com": 10}
            ),
            FileAnalysis(
                path="low_risk.py",
                total_commits=10,
                author_commits={"a@x.com": 3, "b@x.com": 3, "c@x.com": 4}
            )
        ]

        assigned = self.calculator.assign_risk_levels(files)

        assert assigned[0].risk_level == "critical"
        assert assigned[1].risk_level == "low"

    def test_calculate_repository_gini(self):
        """Test repository-wide Gini coefficient."""
        files = [
            FileAnalysis(
                path="file1.py",
                total_commits=10,
                author_commits={"a@x.com": 10}
            ),
            FileAnalysis(
                path="file2.py",
                total_commits=10,
                author_commits={"b@x.com": 10}
            )
        ]

        gini = self.calculator.calculate_repository_gini(files)

        assert gini > 0


class TestRiskAnalyzer:
    """Tests for RiskAnalyzer."""

    def setup_method(self):
        """Set up test fixtures."""
        self.analyzer = RiskAnalyzer()

    def test_identify_hotspots_critical(self):
        """Test hotspot identification for critical files."""
        files = [
            FileAnalysis(
                path="critical.py",
                total_commits=10,
                author_commits={"a@x.com": 9, "b@x.com": 1},
                bus_factor=1.1
            ),
            FileAnalysis(
                path="safe.py",
                total_commits=10,
                author_commits={"a@x.com": 4, "b@x.com": 6},
                bus_factor=2.0
            )
        ]

        hotspots = self.analyzer.identify_hotspots(files)

        assert len(hotspots) >= 1
        assert any(h.risk_level == "critical" for h in hotspots)

    def test_identify_hotspots_limit(self):
        """Test hotspot limit parameter."""
        files = [
            FileAnalysis(
                path=f"file{i}.py",
                total_commits=10,
                author_commits={"a@x.com": 9, "b@x.com": 1},
                bus_factor=1.1
            )
            for i in range(25)
        ]

        hotspots = self.analyzer.identify_hotspots(files, limit=10)

        assert len(hotspots) == 10

    def test_generate_suggestions(self):
        """Test diversification suggestions generation."""
        files = [
            FileAnalysis(
                path="file1.py",
                total_commits=10,
                author_commits={"a@x.com": 9, "b@x.com": 1}
            ),
            FileAnalysis(
                path="file2.py",
                total_commits=10,
                author_commits={"a@x.com": 5, "b@x.com": 5}
            )
        ]

        suggestions = self.analyzer.generate_suggestions(files)

        assert len(suggestions) > 0

    def test_calculate_risk_summary(self):
        """Test risk summary calculation."""
        files = [
            FileAnalysis(
                path="f1.py",
                total_commits=10,
                author_commits={"a@x.com": 10},
                risk_level="critical"
            ),
            FileAnalysis(
                path="f2.py",
                total_commits=10,
                author_commits={"a@x.com": 8, "b@x.com": 2},
                risk_level="high"
            ),
            FileAnalysis(
                path="f3.py",
                total_commits=10,
                author_commits={"a@x.com": 4, "b@x.com": 6},
                risk_level="medium"
            )
        ]

        summary = self.analyzer.calculate_risk_summary(files)

        assert summary["critical"] == 1
        assert summary["high"] == 1
        assert summary["medium"] == 1
        assert "overall_risk" in summary

    def test_calculate_risk_summary_empty(self):
        """Test risk summary with empty files."""
        summary = self.analyzer.calculate_risk_summary([])

        assert summary["overall_risk"] == "unknown"

    def test_analyze_module_risk(self):
        """Test module-level risk analysis."""
        files = [
            FileAnalysis(
                path="core/main.py",
                total_commits=10,
                author_commits={"a@x.com": 10},
                module="core",
                risk_level="critical"
            ),
            FileAnalysis(
                path="core/utils.py",
                total_commits=10,
                author_commits={"a@x.com": 10},
                module="core",
                risk_level="critical"
            ),
            FileAnalysis(
                path="tests/test.py",
                total_commits=10,
                author_commits={"a@x.com": 5, "b@x.com": 5},
                module="tests",
                risk_level="medium"
            )
        ]

        module_risk = self.analyzer.analyze_module_risk(files)

        assert "core" in module_risk
        assert "tests" in module_risk