"""
Sugar v2 vs v3 Benchmark Tests

Tests to measure and compare performance between:
- V2: ClaudeWrapper subprocess-based executor
- V3: AgentSDKExecutor native SDK executor

Run with: pytest tests/test_v3_benchmarks.py -v
"""

import pytest
import time
from datetime import datetime, timezone
from unittest.mock import AsyncMock, MagicMock, patch
from typing import Dict, Any


# ============================================================================
# Performance Metrics
# ============================================================================


class ExecutionMetrics:
    """Track execution metrics for comparison."""

    def __init__(self):
        self.start_time = None
        self.end_time = None
        self.tool_uses = 0
        self.files_modified = []
        self.api_calls = 0
        self.retry_count = 0

    def start(self):
        self.start_time = time.perf_counter()

    def stop(self):
        self.end_time = time.perf_counter()

    @property
    def execution_time(self) -> float:
        if self.start_time and self.end_time:
            return self.end_time - self.start_time
        return 0.0


# ============================================================================
# V2 ClaudeWrapper Mocks
# ============================================================================


@pytest.fixture
def mock_v2_executor():
    """Mock V2 ClaudeWrapper executor."""
    from sugar.executor.claude_wrapper import ClaudeWrapper

    wrapper = ClaudeWrapper.__new__(ClaudeWrapper)
    wrapper.claude_path = "/usr/bin/claude"
    wrapper.timeout = 300
    wrapper.work_dir = "/tmp/test"
    wrapper.config = {}
    return wrapper


# ============================================================================
# V3 AgentSDK Mocks
# ============================================================================


@pytest.fixture
def mock_v3_executor():
    """Mock V3 AgentSDKExecutor."""
    from sugar.executor.agent_sdk_executor import AgentSDKExecutor

    executor = AgentSDKExecutor.__new__(AgentSDKExecutor)
    executor.model = "claude-sonnet-4-20250514"
    executor.config = {}
    executor.quality_gates_config = {}
    executor._agent = None
    return executor


@pytest.fixture
def mock_sugar_agent():
    """Mock SugarAgent for V3 tests."""
    from sugar.agent.base import SugarAgent, SugarAgentConfig

    config = SugarAgentConfig(
        model="claude-sonnet-4-20250514",
        max_tokens=8192,
    )
    agent = SugarAgent(config)
    return agent


# ============================================================================
# Executor Interface Tests
# ============================================================================


class TestExecutorInterfaceCompatibility:
    """Verify V2 and V3 executors have compatible interfaces."""

    def test_execute_work_method_exists_v2(self, mock_v2_executor):
        """V2 executor should have execute_work method."""
        assert hasattr(mock_v2_executor, "execute_work")

    def test_execute_work_method_exists_v3(self, mock_v3_executor):
        """V3 executor should have execute_work method."""
        assert hasattr(mock_v3_executor, "execute_work")

    def test_v3_has_validate_method(self, mock_v3_executor):
        """V3 executor should have validate method."""
        assert hasattr(mock_v3_executor, "validate")


# ============================================================================
# Result Format Compatibility Tests
# ============================================================================


class TestResultFormatCompatibility:
    """Verify V2 and V3 return compatible result formats."""

    @pytest.fixture
    def sample_work_item(self):
        """Sample work item for testing."""
        return {
            "id": "test-123",
            "type": "feature",
            "title": "Test task",
            "description": "Test description",
            "priority": 3,
            "status": "pending",
        }

    def test_result_has_success_field(self, sample_work_item):
        """Both executors should return success field."""
        from sugar.agent.base import AgentResponse

        response = AgentResponse(
            success=True,
            content="Test",
            tool_uses=[],
            files_modified=[],
            execution_time=1.0,
            quality_gate_results={},
        )
        result = response.to_dict()

        assert "success" in result
        assert result["success"] is True

    def test_result_has_execution_time(self, sample_work_item):
        """Both executors should return execution_time field."""
        from sugar.agent.base import AgentResponse

        response = AgentResponse(
            success=True,
            content="Test",
            tool_uses=[],
            files_modified=[],
            execution_time=5.5,
            quality_gate_results={},
        )
        result = response.to_dict()

        assert "execution_time" in result
        assert result["execution_time"] == 5.5

    def test_result_has_files_modified(self, sample_work_item):
        """V3 should track files_modified."""
        from sugar.agent.base import AgentResponse

        response = AgentResponse(
            success=True,
            content="Test",
            tool_uses=[],
            files_modified=["test.py", "utils.py"],
            execution_time=1.0,
            quality_gate_results={},
        )
        result = response.to_dict()

        assert "files_modified" in result
        assert len(result["files_modified"]) == 2


# ============================================================================
# V3 Quality Gate Tests
# ============================================================================


class TestV3QualityGates:
    """Tests for V3-specific quality gate features."""

    def test_quality_gates_in_result(self):
        """V3 should include quality_gate_results in response."""
        from sugar.agent.base import AgentResponse

        response = AgentResponse(
            success=True,
            content="Test",
            tool_uses=[],
            files_modified=[],
            execution_time=1.0,
            quality_gate_results={
                "total_tool_executions": 5,
                "blocked_operations": 0,
                "security_violations": 0,
            },
        )
        result = response.to_dict()

        assert "quality_gate_results" in result
        assert result["quality_gate_results"]["total_tool_executions"] == 5

    def test_security_violations_tracked(self):
        """V3 should track security violations."""
        from sugar.agent.hooks import QualityGateHooks

        hooks = QualityGateHooks()

        # Simulate a security violation
        hooks._security_violations.append(
            {
                "file": ".env",
                "reason": "Protected file access blocked",
            }
        )

        summary = hooks.get_execution_summary()
        assert summary["security_violations"] == 1


# ============================================================================
# V3 Retry Logic Tests
# ============================================================================


class TestV3RetryLogic:
    """Tests for V3 retry logic (not available in V2)."""

    def test_transient_error_detection(self):
        """Test that transient errors are correctly identified."""
        from sugar.agent.base import is_transient_error

        # Rate limit errors - must match TRANSIENT_ERRORS terms
        assert is_transient_error(Exception("rate_limit exceeded"))
        assert is_transient_error(Exception("429 Too Many Requests"))

        # Timeout errors
        assert is_transient_error(Exception("connection timeout"))
        assert is_transient_error(Exception("timeout occurred"))

        # Non-transient errors
        assert not is_transient_error(Exception("Invalid API key"))
        assert not is_transient_error(Exception("File not found"))

    @pytest.mark.asyncio
    async def test_retry_with_backoff_succeeds_after_retry(self):
        """Test that retry logic works for transient failures."""
        from sugar.agent.base import retry_with_backoff

        call_count = 0

        async def flaky_function():
            nonlocal call_count
            call_count += 1
            if call_count < 3:
                raise Exception("rate_limit exceeded")
            return "success"

        result = await retry_with_backoff(
            flaky_function, max_retries=3, base_delay=0.01
        )
        assert result == "success"
        assert call_count == 3


# ============================================================================
# V3 Visibility Tests
# ============================================================================


class TestV3Visibility:
    """Tests for V3 visibility improvements over V2."""

    def test_tool_use_tracking(self):
        """V3 should track individual tool uses."""
        from sugar.agent.base import AgentResponse

        tool_uses = [
            {"tool": "Read", "input": {"file_path": "/test/file.py"}},
            {"tool": "Write", "input": {"file_path": "/test/output.py"}},
        ]

        response = AgentResponse(
            success=True,
            content="Test",
            tool_uses=tool_uses,
            files_modified=["/test/output.py"],
            execution_time=1.0,
            quality_gate_results={},
        )

        assert len(response.tool_uses) == 2
        assert response.tool_uses[0]["tool"] == "Read"

    def test_execution_history(self, mock_sugar_agent):
        """V3 should maintain execution history."""
        # Add to execution history
        mock_sugar_agent._execution_history.append(
            {
                "prompt": "Test prompt",
                "response": "Test response",
                "timestamp": datetime.now(timezone.utc).isoformat(),
            }
        )

        history = mock_sugar_agent.get_execution_history()
        assert len(history) == 1


# ============================================================================
# Performance Comparison Framework
# ============================================================================


class TestPerformanceComparison:
    """Framework for comparing V2 vs V3 performance."""

    def test_v3_startup_overhead(self, mock_sugar_agent):
        """Measure V3 agent creation overhead."""
        from sugar.agent.base import SugarAgent, SugarAgentConfig

        metrics = ExecutionMetrics()
        metrics.start()

        config = SugarAgentConfig(model="claude-sonnet-4-20250514")
        agent = SugarAgent(config)

        metrics.stop()

        # V3 agent creation should be fast (under 100ms)
        assert (
            metrics.execution_time < 0.1
        ), f"Agent creation took {metrics.execution_time:.3f}s"

    @pytest.mark.asyncio
    async def test_v3_session_management(self, mock_sugar_agent):
        """Test V3 session start/end operations."""
        await mock_sugar_agent.start_session()
        assert mock_sugar_agent._session_active is True

        await mock_sugar_agent.end_session()
        assert mock_sugar_agent._session_active is False


# ============================================================================
# Migration Compatibility Tests
# ============================================================================


class TestMigrationCompatibility:
    """Tests for migrating from V2 to V3."""

    def test_config_format_compatible(self):
        """V2 config format should work with V3."""
        v2_config = {
            "sugar": {
                "claude": {
                    "command": "/usr/bin/claude",
                    "timeout": 1800,
                },
                "dry_run": True,
            }
        }

        # V3 should accept V2 config without errors
        from sugar.executor.agent_sdk_executor import AgentSDKExecutor

        executor = AgentSDKExecutor(v2_config)
        assert executor is not None

    def test_executor_selection(self):
        """Config should allow selecting V2 or V3 executor."""
        v3_config = {
            "sugar": {
                "claude": {
                    "executor": "sdk",  # V3
                },
            }
        }

        legacy_config = {
            "sugar": {
                "claude": {
                    "executor": "legacy",  # V2
                },
            }
        }

        # Both configs should be valid
        assert v3_config["sugar"]["claude"]["executor"] == "sdk"
        assert legacy_config["sugar"]["claude"]["executor"] == "legacy"
