import pytest
import pandas as pd
from typing import Dict, List, Any

from app.utils.data_utils import json_to_dataframe, calculate_emotion_percentages, format_results_for_api

class TestDataUtils:
    """Tests for the data utilities."""
    
    def test_json_to_dataframe_empty(self):
        """Test converting empty JSON to DataFrame."""
        # Arrange
        data = {}
        
        # Act
        df = json_to_dataframe(data)
        
        # Assert
        assert df.empty
    
    def test_json_to_dataframe(self):
        """Test converting JSON to DataFrame."""
        # Arrange
        data = {
            "backend1": [
                {
                    "frame_index": 0,
                    "faces": [
                        {
                            "face_box": [0, 0, 100, 100],
                            "emotion": {
                                "angry": 0.1,
                                "disgust": 0.1,
                                "fear": 0.1,
                                "happy": 0.5,
                                "sad": 0.1,
                                "surprise": 0.1,
                                "neutral": 0.0
                            }
                        }
                    ]
                }
            ]
        }
        
        # Act
        df = json_to_dataframe(data)
        
        # Assert
        assert not df.empty
        assert len(df) == 1
        assert "dominant_emotion" in df.columns
        assert "frame_index" in df.columns
        assert "backend" in df.columns
    
    def test_calculate_emotion_percentages_empty(self):
        """Test calculating emotion percentages with empty DataFrame."""
        # Arrange
        df = pd.DataFrame()
        
        # Act
        percentages = calculate_emotion_percentages(df)
        
        # Assert
        assert percentages == {
            "positive": 0,
            "negative": 0,
            "neutral": 0
        }
    
    def test_calculate_emotion_percentages(self):
        """Test calculating emotion percentages."""
        # Arrange
        data = {
            "dominant_emotion": ["happy", "sad", "neutral", "happy", "surprise"]
        }
        df = pd.DataFrame(data)
        
        # Act
        percentages = calculate_emotion_percentages(df)
        
        # Assert
        assert percentages["positive"] == 60.0  # 3/5 * 100
        assert percentages["negative"] == 20.0  # 1/5 * 100
        assert percentages["neutral"] == 20.0   # 1/5 * 100
    
    def test_format_results_for_api_empty(self):
        """Test formatting empty results for API."""
        # Arrange
        emotion_df = None
        transcript = ""
        analysis = {}
        
        # Act
        result = format_results_for_api(emotion_df, transcript, analysis)
        
        # Assert
        assert result["transcript"] == ""
        assert result["emotion_percentages"] == {
            "positive": 0,
            "negative": 0,
            "neutral": 0
        }
        assert result["analysis"] == {}
    
    def test_format_results_for_api(self):
        """Test formatting results for API."""
        # Arrange
        data = {
            "dominant_emotion": ["happy", "sad", "neutral", "happy", "surprise"]
        }
        emotion_df = pd.DataFrame(data)
        transcript = "Test transcript"
        analysis = {"test": "data"}
        
        # Act
        result = format_results_for_api(emotion_df, transcript, analysis)
        
        # Assert
        assert result["transcript"] == transcript
        assert result["emotion_percentages"]["positive"] == 60.0
        assert result["emotion_percentages"]["negative"] == 20.0
        assert result["emotion_percentages"]["neutral"] == 20.0
        assert result["analysis"] == analysis