"""Tests for evaluation metrics."""

import pytest
from core.eval import RAGEvaluator, BenchmarkDataset
from core.eval_utils import generate_evaluation_report
import pandas as pd
from pathlib import Path
import tempfile


def test_hit_at_k():
    """Test Hit@k metric."""
    evaluator = RAGEvaluator()
    
    retrieved = ["doc1", "doc2", "doc3", "doc4", "doc5"]
    relevant = ["doc2", "doc6"]
    
    assert evaluator.hit_at_k(retrieved, relevant, k=5) == 1.0
    assert evaluator.hit_at_k(retrieved, relevant, k=1) == 0.0


def test_precision_recall():
    """Test Precision and Recall metrics."""
    evaluator = RAGEvaluator()
    
    retrieved = ["doc1", "doc2", "doc3"]
    relevant = ["doc2", "doc3", "doc4"]
    
    precision = evaluator.precision_at_k(retrieved, relevant, k=3)
    recall = evaluator.recall_at_k(retrieved, relevant, k=3)
    
    assert precision == pytest.approx(2/3, 0.01)
    assert recall == pytest.approx(2/3, 0.01)


def test_mrr():
    """Test Mean Reciprocal Rank."""
    evaluator = RAGEvaluator()
    
    retrieved = ["doc1", "doc2", "doc3"]
    relevant = ["doc2"]
    
    mrr = evaluator.mrr(retrieved, relevant)
    assert mrr == pytest.approx(0.5, 0.01)  # 1/2


def test_semantic_similarity():
    """Test semantic similarity metric."""
    evaluator = RAGEvaluator()
    
    answer = "The patient needs proper identification."
    reference = "Patient identification is required."
    
    similarity = evaluator.semantic_similarity(answer, reference)
    
    assert 0 <= similarity <= 1
    assert similarity > 0.5  # Should be reasonably similar


def test_benchmark_dataset():
    """Test benchmark dataset functionality."""
    dataset = BenchmarkDataset()
    
    hospital_queries = dataset.get_sample_hospital_queries()
    bank_queries = dataset.get_sample_bank_queries()
    fluid_queries = dataset.get_sample_fluid_simulation_queries()
    
    assert len(hospital_queries) > 0
    assert len(bank_queries) > 0
    assert len(fluid_queries) > 0
    
    assert "query" in hospital_queries[0]
    assert "domain" in hospital_queries[0]


def test_evaluation_report_generation():
    """Test evaluation report generation."""
    # Create sample evaluation data
    data = {
        'query': ['Query 1', 'Query 2', 'Query 3'],
        'base_retrieval_time': [0.05, 0.06, 0.04],
        'base_total_time': [1.5, 2.0, 1.8],
        'hier_retrieval_time': [0.03, 0.04, 0.03],
        'hier_total_time': [1.0, 1.2, 1.1],
        'speedup': [1.5, 1.67, 1.64]
    }
    
    with tempfile.TemporaryDirectory() as temp_dir:
        # Save sample CSV
        csv_path = Path(temp_dir) / "test_eval.csv"
        df = pd.DataFrame(data)
        df.to_csv(csv_path, index=False)
        
        # Generate report
        stats = generate_evaluation_report(str(csv_path))
        
        # Verify statistics
        assert stats['total_queries'] == 3
        assert stats['avg_speedup'] > 1.0
        assert stats['hier_wins'] == 3
        
        # Verify files created
        assert Path(str(csv_path).replace('.csv', '_report_charts.png')).exists()
        assert Path(str(csv_path).replace('.csv', '_report_summary.md')).exists()


def test_evaluate_rag_pipeline():
    """Test complete RAG pipeline evaluation."""
    evaluator = RAGEvaluator()
    
    # Mock RAG result
    rag_result = {
        "answer": "Patient admission requires ID verification.",
        "contexts": [
            {"id": "doc1", "document": "Text about admission", "metadata": {}},
            {"id": "doc2", "document": "Text about verification", "metadata": {}}
        ],
        "retrieval_time": 0.05,
        "generation_time": 1.2,
        "total_time": 1.25,
        "pipeline": "Hier-RAG"
    }
    
    relevant_ids = ["doc1", "doc3"]
    reference_answer = "Admission requires identification."
    
    metrics = evaluator.evaluate_rag_pipeline(
        rag_result,
        relevant_ids,
        reference_answer,
        k_values=[1, 3, 5]
    )
    
    assert "hit@1" in metrics
    assert "hit@3" in metrics
    assert "mrr" in metrics
    assert "semantic_similarity" in metrics
    assert metrics["retrieval_time"] == 0.05


def test_empty_results():
    """Test evaluation with empty results."""
    evaluator = RAGEvaluator()
    
    retrieved = []
    relevant = ["doc1", "doc2"]
    
    assert evaluator.hit_at_k(retrieved, relevant, k=5) == 0.0
    assert evaluator.precision_at_k(retrieved, relevant, k=5) == 0.0
    assert evaluator.mrr(retrieved, relevant) == 0.0