"""
Unit tests for quality gate models and individual gate implementations.

Tests QualityGate models, SchemaValidationGate, and PatternValidationGate.
"""

import json
import pytest

from markitect.prompts.quality.models import (
    GateType,
    ValidationStatus,
    ValidationDiagnostic,
    ValidationResult,
    QualityPolicy,
    HaltDecision,
    HaltingRecord,
)
from markitect.prompts.quality.gates.schema_gate import SchemaValidationGate
from markitect.prompts.quality.gates.pattern_gate import PatternValidationGate


class TestValidationDiagnostic:
    """Tests for ValidationDiagnostic."""

    def test_create_diagnostic(self):
        """Test creating a diagnostic."""
        diag = ValidationDiagnostic(
            code="TEST_ERROR",
            message="Something went wrong",
            severity="error",
        )
        assert diag.code == "TEST_ERROR"
        assert diag.severity == "error"

    def test_to_dict(self):
        """Test diagnostic serialization."""
        diag = ValidationDiagnostic(code="E1", message="msg", severity="warning")
        d = diag.to_dict()
        assert d["code"] == "E1"
        assert d["severity"] == "warning"

    def test_from_dict(self):
        """Test diagnostic deserialization."""
        data = {"code": "E1", "message": "msg", "severity": "info"}
        diag = ValidationDiagnostic.from_dict(data)
        assert diag.code == "E1"
        assert diag.severity == "info"


class TestValidationResult:
    """Tests for ValidationResult."""

    def test_create_result(self):
        """Test creating a validation result."""
        result = ValidationResult.create(
            gate_id="gate-1",
            gate_type=GateType.SCHEMA,
            artifact_id="art-1",
            status=ValidationStatus.PASS,
            score=1.0,
        )
        assert result.gate_id == "gate-1"
        assert result.status == ValidationStatus.PASS
        assert result.score == 1.0

    def test_result_unique_ids(self):
        """Test that each result gets a unique ID."""
        r1 = ValidationResult.create(
            gate_id="g", gate_type=GateType.PATTERN,
            artifact_id="a", status=ValidationStatus.PASS,
        )
        r2 = ValidationResult.create(
            gate_id="g", gate_type=GateType.PATTERN,
            artifact_id="a", status=ValidationStatus.PASS,
        )
        assert r1.id != r2.id

    def test_to_dict_from_dict(self):
        """Test round-trip serialization."""
        result = ValidationResult.create(
            gate_id="g1",
            gate_type=GateType.SCHEMA,
            artifact_id="a1",
            status=ValidationStatus.FAIL,
            score=0.5,
            diagnostics=[
                ValidationDiagnostic(code="E1", message="err", severity="error"),
            ],
        )
        d = result.to_dict()
        restored = ValidationResult.from_dict(d)
        assert restored.id == result.id
        assert restored.status == ValidationStatus.FAIL
        assert restored.score == 0.5
        assert len(restored.diagnostics) == 1


class TestQualityPolicy:
    """Tests for QualityPolicy."""

    def test_default_policy(self):
        """Test default policy values."""
        policy = QualityPolicy()
        assert policy.max_iterations == 3
        assert policy.min_improvement == 0.05
        assert policy.fail_on_gate_failure is True
        assert policy.resource_budget == 10

    def test_to_dict_from_dict(self):
        """Test round-trip serialization."""
        policy = QualityPolicy(
            max_iterations=5,
            min_improvement=0.1,
            required_gate_ids=["g1", "g2"],
        )
        d = policy.to_dict()
        restored = QualityPolicy.from_dict(d)
        assert restored.max_iterations == 5
        assert restored.min_improvement == 0.1
        assert restored.required_gate_ids == ["g1", "g2"]


class TestSchemaValidationGate:
    """Tests for SchemaValidationGate."""

    def test_valid_json_passes(self):
        """Test valid JSON against schema passes."""
        schema = {
            "type": "object",
            "required": ["name", "version"],
            "properties": {
                "name": {"type": "string"},
                "version": {"type": "integer"},
            },
        }
        gate = SchemaValidationGate(schema=schema, name="test-schema")
        content = json.dumps({"name": "test", "version": 1})

        result = gate.validate(content, "art-1")
        assert result.status == ValidationStatus.PASS
        assert result.score == 1.0
        assert len(result.diagnostics) == 0

    def test_missing_required_field_fails(self):
        """Test missing required field fails validation."""
        schema = {
            "type": "object",
            "required": ["name", "version"],
            "properties": {
                "name": {"type": "string"},
                "version": {"type": "integer"},
            },
        }
        gate = SchemaValidationGate(schema=schema)
        content = json.dumps({"name": "test"})

        result = gate.validate(content, "art-1")
        assert result.status == ValidationStatus.FAIL
        assert any(d.code == "SCHEMA_VIOLATION" for d in result.diagnostics)

    def test_wrong_type_fails(self):
        """Test wrong type fails validation."""
        schema = {
            "type": "object",
            "properties": {
                "count": {"type": "integer"},
            },
        }
        gate = SchemaValidationGate(schema=schema)
        content = json.dumps({"count": "not-a-number"})

        result = gate.validate(content, "art-1")
        assert result.status == ValidationStatus.FAIL

    def test_invalid_json_fails(self):
        """Test invalid JSON content fails."""
        schema = {"type": "object"}
        gate = SchemaValidationGate(schema=schema)

        result = gate.validate("not json {{{", "art-1")
        assert result.status == ValidationStatus.FAIL
        assert result.score == 0.0
        assert any(d.code == "INVALID_JSON" for d in result.diagnostics)

    def test_gate_has_correct_type(self):
        """Test gate type is SCHEMA."""
        gate = SchemaValidationGate(schema={"type": "object"})
        assert gate.gate_type == GateType.SCHEMA

    def test_empty_schema_passes_any_object(self):
        """Test empty schema passes any valid JSON."""
        gate = SchemaValidationGate(schema={})
        result = gate.validate(json.dumps({"any": "thing"}), "art-1")
        assert result.status == ValidationStatus.PASS

    def test_score_reflects_error_count(self):
        """Test that score decreases with more errors."""
        schema = {
            "type": "object",
            "required": ["a", "b", "c"],
            "properties": {
                "a": {"type": "string"},
                "b": {"type": "string"},
                "c": {"type": "string"},
            },
        }
        gate = SchemaValidationGate(schema=schema)

        # Missing all 3 required fields
        result = gate.validate(json.dumps({}), "art-1")
        assert result.status == ValidationStatus.FAIL
        assert result.score < 1.0


class TestPatternValidationGate:
    """Tests for PatternValidationGate."""

    def test_required_pattern_present(self):
        """Test content with required patterns passes."""
        gate = PatternValidationGate(
            required_patterns=[r"## Endpoints", r"### Authentication"],
        )
        content = "# API\n## Endpoints\n### Authentication\nDetails here."

        result = gate.validate(content, "art-1")
        assert result.status == ValidationStatus.PASS
        assert result.score == 1.0

    def test_required_pattern_missing(self):
        """Test missing required pattern fails."""
        gate = PatternValidationGate(
            required_patterns=[r"## Endpoints", r"### Authentication"],
        )
        content = "# API\n## Endpoints\nNo auth section."

        result = gate.validate(content, "art-1")
        assert result.status == ValidationStatus.FAIL
        assert any(d.code == "MISSING_PATTERN" for d in result.diagnostics)

    def test_forbidden_pattern_absent(self):
        """Test content without forbidden patterns passes."""
        gate = PatternValidationGate(
            forbidden_patterns=[r"TODO", r"FIXME"],
        )
        content = "This is a clean document."

        result = gate.validate(content, "art-1")
        assert result.status == ValidationStatus.PASS

    def test_forbidden_pattern_present(self):
        """Test content with forbidden pattern fails."""
        gate = PatternValidationGate(
            forbidden_patterns=[r"TODO", r"FIXME"],
        )
        content = "This needs work. TODO: fix this."

        result = gate.validate(content, "art-1")
        assert result.status == ValidationStatus.FAIL
        assert any(d.code == "FORBIDDEN_PATTERN" for d in result.diagnostics)

    def test_combined_required_and_forbidden(self):
        """Test both required and forbidden patterns together."""
        gate = PatternValidationGate(
            required_patterns=[r"## Summary"],
            forbidden_patterns=[r"FIXME"],
        )
        # Has required, no forbidden
        result1 = gate.validate("## Summary\nAll good.", "art-1")
        assert result1.status == ValidationStatus.PASS

        # Has required AND forbidden
        result2 = gate.validate("## Summary\nFIXME: broken.", "art-1")
        assert result2.status == ValidationStatus.FAIL

    def test_no_patterns_passes(self):
        """Test gate with no patterns always passes."""
        gate = PatternValidationGate()
        result = gate.validate("anything", "art-1")
        assert result.status == ValidationStatus.PASS

    def test_gate_has_correct_type(self):
        """Test gate type is PATTERN."""
        gate = PatternValidationGate()
        assert gate.gate_type == GateType.PATTERN

    def test_score_proportional_to_failures(self):
        """Test score is proportional to number of checks passed."""
        gate = PatternValidationGate(
            required_patterns=[r"A", r"B", r"C", r"D"],
        )
        # Only A is present → 3 out of 4 fail
        result = gate.validate("A", "art-1")
        assert result.status == ValidationStatus.FAIL
        assert 0.0 < result.score < 1.0

    def test_regex_pattern_matching(self):
        """Test regex patterns work correctly."""
        gate = PatternValidationGate(
            required_patterns=[r"\d{3}-\d{4}"],
        )
        result = gate.validate("Call 555-1234 for info", "art-1")
        assert result.status == ValidationStatus.PASS