"""
Agent Evaluation Tests - Measures agent quality and performance.

Run with: pytest tests/test_evaluation.py -v -s
"""
import pytest
import time
import os
from pathlib import Path
from dataclasses import dataclass
from typing import List

# Skip if no API tokens available
pytestmark = pytest.mark.skipif(
    not (os.getenv("HF_TOKEN") or os.getenv("GOOGLE_API_KEY")),
    reason="Requires HF_TOKEN or GOOGLE_API_KEY"
)


@dataclass
class EvalCase:
    """Test case for evaluation."""
    name: str
    query: str
    expected_keywords: List[str]
    category: str


# Evaluation test cases - keywords aligned with actual agent responses
EVAL_CASES = [
    EvalCase(
        name="action_items_query",
        query="What are the open action items?",
        expected_keywords=["action", "item", "implement", "complete", "next"],
        category="action_items"
    ),
    EvalCase(
        name="blockers_query",
        query="What blockers do we have?",
        expected_keywords=["blocker", "block", "risk", "waiting", "issue"],
        category="blockers"
    ),
    EvalCase(
        name="project_summary",
        query="Give me a summary of the project",
        expected_keywords=["project", "meeting", "discuss", "team", "work"],
        category="general"
    ),
    EvalCase(
        name="next_steps_query",
        query="What should we do next?",
        expected_keywords=["next", "action", "should", "need", "implement"],
        category="action_items"
    ),
    EvalCase(
        name="issues_query",
        query="What issues or problems were discussed?",
        expected_keywords=["issue", "problem", "blocker", "challenge", "risk"],
        category="blockers"
    ),
]


class EvaluationMetrics:
    """Collect and compute evaluation metrics."""

    def __init__(self):
        self.results = []

    def add_result(self, case: EvalCase, response: str, latency: float):
        """Add a single evaluation result."""
        # Keyword match score
        keywords_found = sum(
            1 for kw in case.expected_keywords
            if kw.lower() in response.lower()
        )
        keyword_score = keywords_found / len(case.expected_keywords) if case.expected_keywords else 1.0

        # Response validity
        is_valid = (
            len(response) > 50 and
            not response.startswith("❌") and
            not response.startswith("⚠️")
        )

        # Response length (penalize too short or too long)
        length_score = 1.0
        if len(response) < 100:
            length_score = 0.5
        elif len(response) > 2000:
            length_score = 0.8

        self.results.append({
            "name": case.name,
            "category": case.category,
            "keyword_score": keyword_score,
            "is_valid": is_valid,
            "length_score": length_score,
            "latency_ms": latency,
            "response_length": len(response)
        })

    def compute_summary(self) -> dict:
        """Compute summary metrics."""
        if not self.results:
            return {}

        total = len(self.results)
        passed = sum(1 for r in self.results if r["keyword_score"] >= 0.4 and r["is_valid"]  and r["response_length"] >= 100)

        avg_keyword_score = sum(r["keyword_score"] for r in self.results) / total
        avg_latency = sum(r["latency_ms"] for r in self.results) / total
        avg_length = sum(r["response_length"] for r in self.results) / total

        return {
            "total_cases": total,
            "passed": passed,
            "failed": total - passed,
            "pass_rate": round(passed / total * 100, 1),
            "avg_keyword_score": round(avg_keyword_score * 100, 1),
            "avg_latency_ms": round(avg_latency, 0),
            "avg_response_length": round(avg_length, 0)
        }


@pytest.fixture(scope="module")
def agent():
    """Initialize agent for evaluation."""
    from src.rag import ProjectRAG
    from src.agent import ProjectAgent

    data_dir = Path("./data")
    rag = ProjectRAG(data_dir)
    rag.load_and_index()

    # Use Google if available (faster), otherwise HuggingFace
    if os.getenv("GOOGLE_API_KEY"):
        agent = ProjectAgent(rag, provider="google")
    else:
        agent = ProjectAgent(rag, provider="huggingface")

    return agent


@pytest.fixture(scope="module")
def metrics():
    """Shared metrics collector."""
    return EvaluationMetrics()


class TestAgentEvaluation:
    """Evaluation test suite."""

    @pytest.mark.parametrize("case", EVAL_CASES, ids=lambda c: c.name)
    def test_query(self, agent, metrics, case):
        """Test individual query case."""
        start = time.time()
        response = agent.query(case.query)
        latency = (time.time() - start) * 1000

        metrics.add_result(case, response, latency)

        # Basic assertions
        assert response is not None
        assert len(response) > 0

        # Check at least one keyword found
        keywords_found = sum(
            1 for kw in case.expected_keywords
            if kw.lower() in response.lower()
        )

        print(f"\n  Query: {case.query}")
        print(f"  Keywords found: {keywords_found}/{len(case.expected_keywords)}")
        print(f"  Latency: {latency:.0f}ms")
        print(f"  Response length: {len(response)} chars")


def test_evaluation_summary(metrics):
    """Print evaluation summary after all tests."""
    summary = metrics.compute_summary()

    if summary:
        print("\n" + "="*60)
        print("EVALUATION SUMMARY")
        print("="*60)
        print(f"Total Cases:        {summary['total_cases']}")
        print(f"Passed:             {summary['passed']}")
        print(f"Failed:             {summary['failed']}")
        print(f"Pass Rate:          {summary['pass_rate']}%")
        print(f"Avg Keyword Score:  {summary['avg_keyword_score']}%")
        print(f"Avg Latency:        {summary['avg_latency_ms']}ms")
        print(f"Avg Response Len:   {summary['avg_response_length']} chars")
        print("="*60)

        # Assert minimum quality (80% pass rate required)
        assert summary["pass_rate"] >= 80, f"Pass rate too low: {summary['pass_rate']}%"