"""Tests for headless simulation engine."""

import time
from unittest.mock import Mock, patch

from engines.headless_engine import HeadlessSimulationEngine, HeadlessConfig
from config.simulation_config import SimulationConfig


class TestHeadlessConfig:
    """Test headless configuration."""

    def test_custom_values(self):
        """Test custom configuration values."""
        sim_config = SimulationConfig(initial_cells=50, default_tps=120.0)

        config = HeadlessConfig(
            simulation=sim_config,
            max_ticks=10000,
            max_duration=300.0,
            output_dir="custom_output",
            enable_metrics=False,
            enable_entities=True,
            enable_evolution=False,
            metrics_interval=50,
            entities_interval=500,
            evolution_interval=2000,
            output_formats=['json', 'csv'],
            real_time=True
        )

        assert config.simulation == sim_config
        assert config.max_ticks == 10000
        assert config.max_duration == 300.0
        assert config.output_dir == "custom_output"
        assert config.enable_metrics == False
        assert config.enable_entities == True
        assert config.enable_evolution == False
        assert config.metrics_interval == 50
        assert config.entities_interval == 500
        assert config.evolution_interval == 2000
        assert config.output_formats == ['json', 'csv']
        assert config.real_time == True


class TestHeadlessSimulationEngine:
    """Test headless simulation engine."""

    def test_initialization(self):
        """Test engine initialization."""
        sim_config = SimulationConfig(initial_cells=5, initial_food=10)
        config = HeadlessConfig(
            simulation=sim_config,
            max_ticks=1000,
            output_formats=['json']
        )

        engine = HeadlessSimulationEngine(config)

        assert engine.config == config
        assert engine.event_bus is not None
        assert engine.simulation_core is not None
        assert engine.file_writer is not None
        assert engine.formatters is not None
        assert engine.collectors is not None
        assert engine.running == False
        assert engine.start_time is None

    def test_collectors_creation(self):
        """Test collectors are created based on configuration."""
        sim_config = SimulationConfig()
        config = HeadlessConfig(
            simulation=sim_config,
            enable_metrics=True,
            enable_entities=True,
            enable_evolution=False,
            metrics_interval=50,
            entities_interval=200
        )

        engine = HeadlessSimulationEngine(config)

        assert 'metrics' in engine.collectors
        assert 'entities' in engine.collectors
        assert 'evolution' not in engine.collectors
        assert engine.collectors['metrics'].collection_interval == 50
        assert engine.collectors['entities'].collection_interval == 200

    def test_formatters_creation(self):
        """Test formatters are created based on configuration."""
        sim_config = SimulationConfig()
        config = HeadlessConfig(
            simulation=sim_config,
            output_formats=['json', 'csv']
        )

        engine = HeadlessSimulationEngine(config)

        assert 'json' in engine.formatters
        assert 'csv' in engine.formatters

    def test_should_terminate_max_ticks(self):
        """Test termination condition for max ticks."""
        sim_config = SimulationConfig()
        config = HeadlessConfig(simulation=sim_config, max_ticks=100)

        engine = HeadlessSimulationEngine(config)
        engine.running = True
        engine.start_time = time.time()

        # Mock the simulation core to report tick count
        engine.simulation_core.state.total_ticks = 99
        assert engine._should_terminate() == False

        engine.simulation_core.state.total_ticks = 100
        assert engine._should_terminate() == True

    def test_should_terminate_max_duration(self):
        """Test termination condition for max duration."""
        sim_config = SimulationConfig()
        config = HeadlessConfig(simulation=sim_config, max_duration=1.0)

        engine = HeadlessSimulationEngine(config)
        engine.running = True
        engine.start_time = time.time()

        # Should not terminate immediately
        assert engine._should_terminate() == False

        # Mock time passage
        with patch('time.time', return_value=engine.start_time + 1.5):
            assert engine._should_terminate() == True

    def test_should_terminate_no_limits(self):
        """Test no termination conditions."""
        sim_config = SimulationConfig()
        config = HeadlessConfig(simulation=sim_config)

        engine = HeadlessSimulationEngine(config)
        engine.running = True
        engine.start_time = time.time()

        # Should never terminate without limits
        assert engine._should_terminate() == False

    def test_collect_data(self):
        """Test data collection from collectors."""
        sim_config = SimulationConfig()
        config = HeadlessConfig(
            simulation=sim_config,
            enable_metrics=True,
            enable_entities=False,
            enable_evolution=False
        )

        engine = HeadlessSimulationEngine(config)

        # Mock simulation core's get_world_state method
        engine.simulation_core.get_world_state = Mock(return_value={
            'tick_count': 1000,
        'actual_tps': 60.0,
            'entity_counts': {'total': 25}
        })

        # Mock collector
        mock_collector = Mock()
        mock_collector.update.return_value = [
            {'tick_count': 1000, 'actual_tps': 60.0, 'collection_type': 'metrics'}
        ]
        engine.collectors['metrics'] = mock_collector

        engine._collect_data()

        # Verify collector was called
        mock_collector.update.assert_called_once()

        # Verify data was collected
        assert len(engine.batch_data['metrics']) == 1
        assert engine.batch_data['metrics'][0]['tick_count'] == 1000

    def test_get_real_time_status(self):
        """Test real-time status reporting."""
        sim_config = SimulationConfig()
        config = HeadlessConfig(simulation=sim_config)

        engine = HeadlessSimulationEngine(config)
        engine.running = True
        engine.start_time = time.time() - 5.0

        # Mock simulation state
        engine.simulation_core.state.total_ticks = 300
        engine.simulation_core.state.actual_tps = 60.0
        engine.simulation_core.get_world_state = Mock(return_value={
            'tick_count': 300,
            'actual_tps': 60.0,
            'entity_counts': {'total': 50}
        })

        status = engine.get_real_time_status()

        assert status['running'] == True
        assert status['ticks'] == 300
        assert status['tps'] == 60.0
        assert status['duration'] > 4.0  # Approximately 5 seconds
        assert status['world_state']['tick_count'] == 300

    def test_signal_handler(self):
        """Test signal handling for graceful shutdown."""
        sim_config = SimulationConfig()
        config = HeadlessConfig(simulation=sim_config)

        engine = HeadlessSimulationEngine(config)
        engine.running = True

        # Simulate signal handler
        engine._signal_handler(2, None)  # SIGINT

        assert engine.running == False