"""Tests for the rules module."""

import pytest
from cli_diff_auditor.rules import (
    BuiltInRules,
    Finding,
    Rule,
    RulesLoader,
    Severity,
)


class TestRule:
    """Test cases for Rule class."""

    def test_rule_creation(self):
        """Test creating a Rule instance."""
        rule = Rule(
            id="test-rule",
            name="Test Rule",
            description="A test rule",
            pattern=r"test.*",
            severity=Severity.WARNING,
            auto_fix=True,
            category="testing"
        )

        assert rule.id == "test-rule"
        assert rule.name == "Test Rule"
        assert rule.severity == Severity.WARNING
        assert rule.auto_fix is True
        assert rule.enabled is True

    def test_compile_pattern(self):
        """Test compiling a rule pattern."""
        rule = Rule(
            id="test",
            name="Test",
            description="Test",
            pattern=r"\bprint\s*\(",
            severity=Severity.WARNING
        )

        compiled = rule.compile_pattern()

        assert compiled.search("print('hello')") is not None
        assert compiled.search("hello world") is None

    def test_get_fix_pattern(self):
        """Test getting the fix pattern."""
        rule = Rule(
            id="test",
            name="Test",
            description="Test",
            pattern=r"test",
            severity=Severity.INFO,
            auto_fix=True,
            fix_pattern=r"old",
            replacement="new"
        )

        fix_pattern = rule.get_fix_pattern()

        assert fix_pattern is not None
        assert fix_pattern.search("old text") is not None


class TestBuiltInRules:
    """Test cases for BuiltInRules class."""

    def test_get_all_rules_returns_list(self):
        """Test that get_all_rules returns a list."""
        rules = BuiltInRules.get_all_rules()

        assert isinstance(rules, list)
        assert len(rules) > 0

    def test_rules_have_required_fields(self):
        """Test that all rules have required fields."""
        rules = BuiltInRules.get_all_rules()

        for rule in rules:
            assert rule.id
            assert rule.name
            assert rule.description
            assert rule.pattern
            assert rule.severity

    def test_debug_rules_exist(self):
        """Test that debug-related rules exist."""
        rules = BuiltInRules.get_all_rules()
        rule_ids = [r.id for r in rules]

        assert "debug-print" in rule_ids
        assert "console-log" in rule_ids

    def test_security_rules_exist(self):
        """Test that security-related rules exist."""
        rules = BuiltInRules.get_all_rules()
        rule_ids = [r.id for r in rules]

        assert "sql-injection" in rule_ids
        assert "hardcoded-password" in rule_ids
        assert "eval-usage" in rule_ids

    def test_error_handling_rules_exist(self):
        """Test that error handling rules exist."""
        rules = BuiltInRules.get_all_rules()
        rule_ids = [r.id for r in rules]

        assert "bare-except" in rule_ids
        assert "pass-except" in rule_ids


class TestRulesLoader:
    """Test cases for RulesLoader class."""

    def setup_method(self):
        """Set up test fixtures."""
        self.loader = RulesLoader()

    def test_load_builtin_rules(self):
        """Test loading built-in rules."""
        self.loader.load_builtin_rules()

        rules = self.loader.get_all_rules()

        assert len(rules) > 0

    def test_get_rule(self):
        """Test getting a specific rule."""
        self.loader.load_builtin_rules()

        rule = self.loader.get_rule("debug-print")

        assert rule is not None
        assert rule.id == "debug-print"

    def test_get_nonexistent_rule(self):
        """Test getting a rule that doesn't exist."""
        self.loader.load_builtin_rules()

        rule = self.loader.get_rule("nonexistent-rule")

        assert rule is None

    def test_disable_rule(self):
        """Test disabling a rule."""
        self.loader.load_builtin_rules()

        result = self.loader.disable_rule("debug-print")

        assert result is True

        rule = self.loader.get_rule("debug-print")
        assert rule.enabled is False

    def test_enable_rule(self):
        """Test enabling a rule."""
        self.loader.load_builtin_rules()
        self.loader.disable_rule("debug-print")

        result = self.loader.enable_rule("debug-print")

        assert result is True

        rule = self.loader.get_rule("debug-print")
        assert rule.enabled is True

    def test_get_enabled_rules(self):
        """Test getting only enabled rules."""
        self.loader.load_builtin_rules()
        self.loader.disable_rule("debug-print")
        self.loader.disable_rule("console-log")

        enabled = self.loader.get_enabled_rules()

        rule_ids = [r.id for r in enabled]

        assert "debug-print" not in rule_ids
        assert "console-log" not in rule_ids

    def test_load_from_yaml(self):
        """Test loading rules from YAML."""
        self.loader.load_builtin_rules()
        yaml_content = """
rules:
  - id: custom-rule
    name: Custom Rule
    description: A custom rule
    pattern: "custom.*"
    severity: warning
    category: custom
"""
        rules = self.loader.load_from_yaml(yaml_content)

        assert len(rules) == 1
        assert rules[0].id == "custom-rule"

        all_rules = self.loader.get_all_rules()
        assert len(all_rules) > 1

    def test_load_from_yaml_minimal(self):
        """Test loading rules with minimal fields."""
        yaml_content = """
rules:
  - id: minimal-rule
    name: Minimal
    description: Minimal description
    pattern: "test"
    severity: error
"""
        rules = self.loader.load_from_yaml(yaml_content)

        assert len(rules) == 1
        assert rules[0].severity == Severity.ERROR
        assert rules[0].auto_fix is False
        assert rules[0].category == "custom"

    def test_parse_rule_data_missing_required_field(self):
        """Test parsing rule data with missing required field."""
        data = {
            "id": "test",
            "name": "Test",
            "description": "Test"
        }

        with pytest.raises(ValueError):
            self.loader._parse_rule_data(data)


class TestFinding:
    """Test cases for Finding class."""

    def test_finding_creation(self):
        """Test creating a Finding instance."""
        finding = Finding(
            rule_id="test-rule",
            rule_name="Test Rule",
            severity=Severity.WARNING,
            file_path="test.py",
            line_number=10,
            line_content="print('debug')",
            message="Debug print statement detected",
            fix_available=True
        )

        assert finding.rule_id == "test-rule"
        assert finding.severity == Severity.WARNING
        assert finding.line_number == 10
        assert finding.fix_available is True