"""可视化工具的单元测试。"""

import pytest
import pandas as pd
import numpy as np
import os
from pathlib import Path
import tempfile
import shutil

from src.tools.viz_tools import (
    CreateBarChartTool,
    CreateLineChartTool,
    CreatePieChartTool,
    CreateHeatmapTool
)
from src.models import DataProfile, ColumnInfo


@pytest.fixture
def temp_output_dir():
    """创建临时输出目录。"""
    temp_dir = tempfile.mkdtemp()
    yield temp_dir
    # 清理
    shutil.rmtree(temp_dir, ignore_errors=True)


class TestCreateBarChartTool:
    """测试柱状图工具。"""
    
    def test_basic_functionality(self, temp_output_dir):
        """测试基本功能。"""
        tool = CreateBarChartTool()
        df = pd.DataFrame({
            'category': ['A', 'B', 'C', 'A', 'B', 'A'],
            'value': [10, 20, 30, 15, 25, 20]
        })
        
        output_path = os.path.join(temp_output_dir, 'bar_chart.png')
        result = tool.execute(df, x_column='category', output_path=output_path)
        
        assert result['success'] is True
        assert os.path.exists(output_path)
        assert result['chart_type'] == 'bar'
        assert result['x_column'] == 'category'
    
    def test_with_y_column(self, temp_output_dir):
        """测试指定Y列。"""
        tool = CreateBarChartTool()
        df = pd.DataFrame({
            'category': ['A', 'B', 'C'],
            'value': [100, 200, 300]
        })
        
        output_path = os.path.join(temp_output_dir, 'bar_chart_y.png')
        result = tool.execute(
            df,
            x_column='category',
            y_column='value',
            output_path=output_path
        )
        
        assert result['success'] is True
        assert os.path.exists(output_path)
        assert result['y_column'] == 'value'
    
    def test_top_n_limit(self, temp_output_dir):
        """测试 top_n 限制。"""
        tool = CreateBarChartTool()
        df = pd.DataFrame({
            'category': [f'cat_{i}' for i in range(50)],
            'value': range(50)
        })
        
        output_path = os.path.join(temp_output_dir, 'bar_chart_top.png')
        result = tool.execute(
            df,
            x_column='category',
            y_column='value',
            top_n=10,
            output_path=output_path
        )
        
        assert result['success'] is True
        assert result['data_points'] == 10
    
    def test_nonexistent_column(self):
        """测试不存在的列。"""
        tool = CreateBarChartTool()
        df = pd.DataFrame({'col1': [1, 2, 3]})
        
        result = tool.execute(df, x_column='nonexistent')
        
        assert 'error' in result


class TestCreateLineChartTool:
    """测试折线图工具。"""
    
    def test_basic_functionality(self, temp_output_dir):
        """测试基本功能。"""
        tool = CreateLineChartTool()
        df = pd.DataFrame({
            'x': range(10),
            'y': [i * 2 for i in range(10)]
        })
        
        output_path = os.path.join(temp_output_dir, 'line_chart.png')
        result = tool.execute(
            df,
            x_column='x',
            y_column='y',
            output_path=output_path
        )
        
        assert result['success'] is True
        assert os.path.exists(output_path)
        assert result['chart_type'] == 'line'
    
    def test_with_datetime(self, temp_output_dir):
        """测试时间序列数据。"""
        tool = CreateLineChartTool()
        dates = pd.date_range('2020-01-01', periods=20, freq='D')
        df = pd.DataFrame({
            'date': dates,
            'value': range(20)
        })
        
        output_path = os.path.join(temp_output_dir, 'line_chart_time.png')
        result = tool.execute(
            df,
            x_column='date',
            y_column='value',
            output_path=output_path
        )
        
        assert result['success'] is True
        assert os.path.exists(output_path)
    
    def test_large_dataset_sampling(self, temp_output_dir):
        """测试大数据集采样。"""
        tool = CreateLineChartTool()
        df = pd.DataFrame({
            'x': range(2000),
            'y': range(2000)
        })
        
        output_path = os.path.join(temp_output_dir, 'line_chart_large.png')
        result = tool.execute(
            df,
            x_column='x',
            y_column='y',
            output_path=output_path
        )
        
        assert result['success'] is True
        # 应该被采样到1000个点左右
        assert result['data_points'] <= 1000


class TestCreatePieChartTool:
    """测试饼图工具。"""
    
    def test_basic_functionality(self, temp_output_dir):
        """测试基本功能。"""
        tool = CreatePieChartTool()
        df = pd.DataFrame({
            'category': ['A', 'B', 'C', 'A', 'B', 'A']
        })
        
        output_path = os.path.join(temp_output_dir, 'pie_chart.png')
        result = tool.execute(
            df,
            column='category',
            output_path=output_path
        )
        
        assert result['success'] is True
        assert os.path.exists(output_path)
        assert result['chart_type'] == 'pie'
        assert result['categories'] == 3
    
    def test_top_n_with_others(self, temp_output_dir):
        """测试 top_n 并归类其他。"""
        tool = CreatePieChartTool()
        df = pd.DataFrame({
            'category': [f'cat_{i}' for i in range(20)] * 5
        })
        
        output_path = os.path.join(temp_output_dir, 'pie_chart_top.png')
        result = tool.execute(
            df,
            column='category',
            top_n=5,
            output_path=output_path
        )
        
        assert result['success'] is True
        # 5个类别 + 1个"其他"
        assert result['categories'] == 6


class TestCreateHeatmapTool:
    """测试热力图工具。"""
    
    def test_basic_functionality(self, temp_output_dir):
        """测试基本功能。"""
        tool = CreateHeatmapTool()
        df = pd.DataFrame({
            'x': range(10),
            'y': [i * 2 for i in range(10)],
            'z': [i * 3 for i in range(10)]
        })
        
        output_path = os.path.join(temp_output_dir, 'heatmap.png')
        result = tool.execute(df, output_path=output_path)
        
        assert result['success'] is True
        assert os.path.exists(output_path)
        assert result['chart_type'] == 'heatmap'
        assert len(result['columns']) == 3
    
    def test_with_specific_columns(self, temp_output_dir):
        """测试指定列。"""
        tool = CreateHeatmapTool()
        df = pd.DataFrame({
            'a': range(10),
            'b': range(10, 20),
            'c': range(20, 30),
            'd': range(30, 40)
        })
        
        output_path = os.path.join(temp_output_dir, 'heatmap_cols.png')
        result = tool.execute(
            df,
            columns=['a', 'b', 'c'],
            output_path=output_path
        )
        
        assert result['success'] is True
        assert len(result['columns']) == 3
        assert 'd' not in result['columns']
    
    def test_insufficient_columns(self):
        """测试列数不足。"""
        tool = CreateHeatmapTool()
        df = pd.DataFrame({'x': range(10)})
        
        result = tool.execute(df)
        
        assert 'error' in result


class TestVisualizationToolsApplicability:
    """测试可视化工具的适用性判断。"""
    
    def test_bar_chart_applicability(self):
        """测试柱状图适用性。"""
        tool = CreateBarChartTool()
        profile = DataProfile(
            file_path='test.csv',
            row_count=100,
            column_count=1,
            columns=[
                ColumnInfo(name='cat', dtype='categorical', missing_rate=0.0, unique_count=5)
            ],
            inferred_type='unknown'
        )
        
        assert tool.is_applicable(profile) is True
    
    def test_line_chart_applicability(self):
        """测试折线图适用性。"""
        tool = CreateLineChartTool()
        
        # 包含数值列
        profile_numeric = DataProfile(
            file_path='test.csv',
            row_count=100,
            column_count=1,
            columns=[
                ColumnInfo(name='value', dtype='numeric', missing_rate=0.0, unique_count=50)
            ],
            inferred_type='unknown'
        )
        assert tool.is_applicable(profile_numeric) is True
        
        # 不包含数值列
        profile_text = DataProfile(
            file_path='test.csv',
            row_count=100,
            column_count=1,
            columns=[
                ColumnInfo(name='text', dtype='text', missing_rate=0.0, unique_count=50)
            ],
            inferred_type='unknown'
        )
        assert tool.is_applicable(profile_text) is False
    
    def test_heatmap_applicability(self):
        """测试热力图适用性。"""
        tool = CreateHeatmapTool()
        
        # 包含至少两个数值列
        profile_sufficient = DataProfile(
            file_path='test.csv',
            row_count=100,
            column_count=2,
            columns=[
                ColumnInfo(name='x', dtype='numeric', missing_rate=0.0, unique_count=50),
                ColumnInfo(name='y', dtype='numeric', missing_rate=0.0, unique_count=50)
            ],
            inferred_type='unknown'
        )
        assert tool.is_applicable(profile_sufficient) is True
        
        # 只有一个数值列
        profile_insufficient = DataProfile(
            file_path='test.csv',
            row_count=100,
            column_count=1,
            columns=[
                ColumnInfo(name='x', dtype='numeric', missing_rate=0.0, unique_count=50)
            ],
            inferred_type='unknown'
        )
        assert tool.is_applicable(profile_insufficient) is False


class TestVisualizationErrorHandling:
    """测试可视化工具的错误处理。"""
    
    def test_invalid_output_path(self):
        """测试无效的输出路径。"""
        tool = CreateBarChartTool()
        df = pd.DataFrame({'cat': ['A', 'B', 'C']})
        
        # 使用无效路径（只读目录等）
        # 注意：这个测试可能在某些系统上不会失败
        result = tool.execute(
            df,
            x_column='cat',
            output_path='/invalid/path/chart.png'
        )
        
        # 应该返回错误或成功创建目录
        assert 'error' in result or result['success'] is True
    
    def test_empty_dataframe(self):
        """测试空 DataFrame。"""
        tool = CreateBarChartTool()
        df = pd.DataFrame()
        
        result = tool.execute(df, x_column='nonexistent')
        
        assert 'error' in result