"""
tests/smoke_test.py
Quick sanity check — verifies imports and a basic FAISS index round-trip.
Run with:  python -m pytest tests/smoke_test.py -v
"""

import sys
import os

# Make sure the project root is on the path
sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), "..")))


def test_imports():
    """All RAG modules should import without error."""
    from rag import document_loader, embedder, retriever, chain  # noqa: F401


def test_index_and_retrieve():
    """Build a tiny FAISS index and assert we get a result back."""
    from rag.embedder import build_index
    from rag.retriever import retrieve

    docs = [
        {"source": "test.txt", "text": "The refund policy allows returns within 30 days of purchase."},
        {"source": "test.txt", "text": "Contact support at support@example.com for assistance."},
    ]

    idx = build_index(docs)
    assert idx.index.ntotal > 0, "Index should have at least one vector"

    results = retrieve("What is the refund policy?", idx, top_k=2)
    assert len(results) > 0, "Should return at least one result"

    # Cosine similarity scores should be in (0, 1] range
    for r in results:
        assert 0.0 <= r["score"] <= 1.01, f"Unexpected score: {r['score']}"
        assert "source" in r and "text" in r


def test_chunk_not_empty():
    """Chunker should produce non-empty chunks."""
    from rag.embedder import _chunk_text

    chunks = _chunk_text("doc.txt", "Hello world. " * 100)
    assert len(chunks) > 0
    for c in chunks:
        assert c["text"].strip()