"""Unit tests for analysis planning engine."""

import pytest

from src.engines.analysis_planning import (
    plan_analysis,
    validate_task_dependencies,
    _fallback_analysis_planning,
    _has_circular_dependency
)
from src.models.data_profile import DataProfile, ColumnInfo
from src.models.requirement_spec import RequirementSpec, AnalysisObjective
from src.models.analysis_plan import AnalysisTask


@pytest.fixture
def sample_data_profile():
    """Create a sample data profile for testing."""
    return DataProfile(
        file_path='test.csv',
        row_count=1000,
        column_count=5,
        columns=[
            ColumnInfo(
                name='created_at',
                dtype='datetime',
                missing_rate=0.0,
                unique_count=1000
            ),
            ColumnInfo(
                name='status',
                dtype='categorical',
                missing_rate=0.1,
                unique_count=5
            ),
            ColumnInfo(
                name='type',
                dtype='categorical',
                missing_rate=0.0,
                unique_count=10
            ),
            ColumnInfo(
                name='priority',
                dtype='numeric',
                missing_rate=0.0,
                unique_count=5
            ),
            ColumnInfo(
                name='description',
                dtype='text',
                missing_rate=0.05,
                unique_count=950
            )
        ],
        inferred_type='ticket',
        key_fields={'time': 'created_at', 'status': 'status'},
        quality_score=85.0,
        summary='Ticket data with 1000 rows'
    )


@pytest.fixture
def sample_requirement():
    """Create a sample requirement for testing."""
    return RequirementSpec(
        user_input="分析工单健康度和趋势",
        objectives=[
            AnalysisObjective(
                name="健康度分析",
                description="评估工单处理的健康状况",
                metrics=["完成率", "处理效率"],
                priority=5
            ),
            AnalysisObjective(
                name="趋势分析",
                description="分析工单随时间的变化趋势",
                metrics=["时间序列", "增长率"],
                priority=4
            )
        ]
    )


def test_fallback_planning_generates_tasks(sample_data_profile, sample_requirement):
    """Test that fallback planning generates tasks."""
    plan = _fallback_analysis_planning(sample_data_profile, sample_requirement)
    
    # Should have tasks
    assert len(plan.tasks) > 0
    
    # Should have objectives
    assert len(plan.objectives) == len(sample_requirement.objectives)
    
    # Should have estimated duration
    assert plan.estimated_duration > 0


def test_fallback_planning_respects_objectives(sample_data_profile, sample_requirement):
    """Test that fallback planning creates tasks based on objectives."""
    plan = _fallback_analysis_planning(sample_data_profile, sample_requirement)
    
    # Should have tasks related to health analysis
    health_tasks = [t for t in plan.tasks if '健康' in t.name or '质量' in t.name]
    assert len(health_tasks) > 0
    
    # Should have tasks related to trend analysis
    trend_tasks = [t for t in plan.tasks if '趋势' in t.name or '时间' in t.name]
    assert len(trend_tasks) > 0


def test_fallback_planning_with_no_matching_objectives(sample_data_profile):
    """Test fallback planning with generic objectives."""
    requirement = RequirementSpec(
        user_input="分析数据",
        objectives=[
            AnalysisObjective(
                name="综合分析",
                description="全面分析数据",
                metrics=[],
                priority=3
            )
        ]
    )
    
    plan = _fallback_analysis_planning(sample_data_profile, requirement)
    
    # Should still generate at least one task
    assert len(plan.tasks) > 0


def test_fallback_planning_with_empty_objectives(sample_data_profile):
    """Test fallback planning with no objectives."""
    requirement = RequirementSpec(
        user_input="分析数据",
        objectives=[]
    )
    
    plan = _fallback_analysis_planning(sample_data_profile, requirement)
    
    # Should generate default task
    assert len(plan.tasks) > 0


def test_validate_dependencies_valid():
    """Test validation with valid dependencies."""
    tasks = [
        AnalysisTask(
            id="task_1",
            name="Task 1",
            description="First task",
            priority=5,
            dependencies=[]
        ),
        AnalysisTask(
            id="task_2",
            name="Task 2",
            description="Second task",
            priority=4,
            dependencies=["task_1"]
        ),
        AnalysisTask(
            id="task_3",
            name="Task 3",
            description="Third task",
            priority=3,
            dependencies=["task_1", "task_2"]
        )
    ]
    
    validation = validate_task_dependencies(tasks)
    
    assert validation['valid']
    assert validation['forms_dag']
    assert not validation['has_circular_dependency']
    assert len(validation['missing_dependencies']) == 0


def test_validate_dependencies_with_cycle():
    """Test validation detects circular dependencies."""
    tasks = [
        AnalysisTask(
            id="task_1",
            name="Task 1",
            description="First task",
            priority=5,
            dependencies=["task_2"]
        ),
        AnalysisTask(
            id="task_2",
            name="Task 2",
            description="Second task",
            priority=4,
            dependencies=["task_1"]
        )
    ]
    
    validation = validate_task_dependencies(tasks)
    
    assert not validation['valid']
    assert validation['has_circular_dependency']
    assert not validation['forms_dag']


def test_validate_dependencies_with_missing():
    """Test validation detects missing dependencies."""
    tasks = [
        AnalysisTask(
            id="task_1",
            name="Task 1",
            description="First task",
            priority=5,
            dependencies=["task_999"]  # Doesn't exist
        )
    ]
    
    validation = validate_task_dependencies(tasks)
    
    assert not validation['valid']
    assert len(validation['missing_dependencies']) > 0


def test_has_circular_dependency_simple_cycle():
    """Test circular dependency detection with simple cycle."""
    tasks = [
        AnalysisTask(
            id="A",
            name="Task A",
            description="Task A",
            priority=3,
            dependencies=["B"]
        ),
        AnalysisTask(
            id="B",
            name="Task B",
            description="Task B",
            priority=3,
            dependencies=["A"]
        )
    ]
    
    assert _has_circular_dependency(tasks)


def test_has_circular_dependency_complex_cycle():
    """Test circular dependency detection with complex cycle."""
    tasks = [
        AnalysisTask(
            id="A",
            name="Task A",
            description="Task A",
            priority=3,
            dependencies=["B"]
        ),
        AnalysisTask(
            id="B",
            name="Task B",
            description="Task B",
            priority=3,
            dependencies=["C"]
        ),
        AnalysisTask(
            id="C",
            name="Task C",
            description="Task C",
            priority=3,
            dependencies=["A"]  # Cycle: A -> B -> C -> A
        )
    ]
    
    assert _has_circular_dependency(tasks)


def test_has_circular_dependency_no_cycle():
    """Test circular dependency detection with no cycle."""
    tasks = [
        AnalysisTask(
            id="A",
            name="Task A",
            description="Task A",
            priority=3,
            dependencies=[]
        ),
        AnalysisTask(
            id="B",
            name="Task B",
            description="Task B",
            priority=3,
            dependencies=["A"]
        ),
        AnalysisTask(
            id="C",
            name="Task C",
            description="Task C",
            priority=3,
            dependencies=["A", "B"]
        )
    ]
    
    assert not _has_circular_dependency(tasks)


def test_task_priority_range(sample_data_profile, sample_requirement):
    """Test that all generated tasks have valid priority range."""
    plan = _fallback_analysis_planning(sample_data_profile, sample_requirement)
    
    for task in plan.tasks:
        assert 1 <= task.priority <= 5, \
            f"Task {task.id} has invalid priority {task.priority}"


def test_task_unique_ids(sample_data_profile, sample_requirement):
    """Test that all tasks have unique IDs."""
    plan = _fallback_analysis_planning(sample_data_profile, sample_requirement)
    
    task_ids = [task.id for task in plan.tasks]
    assert len(task_ids) == len(set(task_ids)), "Task IDs should be unique"


def test_plan_has_timestamps(sample_data_profile, sample_requirement):
    """Test that plan has creation and update timestamps."""
    plan = _fallback_analysis_planning(sample_data_profile, sample_requirement)
    
    assert plan.created_at is not None
    assert plan.updated_at is not None


def test_task_required_tools_is_list(sample_data_profile, sample_requirement):
    """Test that required_tools is always a list."""
    plan = _fallback_analysis_planning(sample_data_profile, sample_requirement)
    
    for task in plan.tasks:
        assert isinstance(task.required_tools, list), \
            f"Task {task.id} required_tools should be a list"


def test_task_dependencies_is_list(sample_data_profile, sample_requirement):
    """Test that dependencies is always a list."""
    plan = _fallback_analysis_planning(sample_data_profile, sample_requirement)
    
    for task in plan.tasks:
        assert isinstance(task.dependencies, list), \
            f"Task {task.id} dependencies should be a list"