from __future__ import annotations

from types import SimpleNamespace
from unittest.mock import Mock, patch

from django.test import SimpleTestCase

from rag.embedding import embed_texts
from rag.ingest import ingest
from rag.observability import METRICS
from rag.retrieve import search_with_query


class RAGObservabilityTests(SimpleTestCase):
    def tearDown(self):
        METRICS.clear()

    def test_embed_texts_records_empty_input_metric(self):
        result = embed_texts([])

        self.assertEqual(result, [])
        self.assertEqual(METRICS["rag.embedding.empty_input|operation=embed_texts"], 1)

    @patch("rag.retrieve.QdrantVectorStore")
    @patch("rag.retrieve.embed_single", return_value=[0.1, 0.2])
    @patch("rag.retrieve.load_rag_config")
    def test_search_with_query_records_empty_result_metric(self, mock_load_config, _mock_embed, mock_store_cls):
        mock_load_config.return_value = SimpleNamespace(
            embedding=SimpleNamespace(provider="gapgpt"),
        )
        mock_store = Mock()
        mock_store.search.return_value = []
        mock_store_cls.return_value = mock_store

        result = search_with_query("query")

        self.assertEqual(result, [])
        self.assertEqual(METRICS["rag.retrieve.empty_result|operation=search_with_query,service_id=None"], 1)

    @patch("rag.ingest.load_sources", return_value=[])
    @patch("rag.ingest.QdrantVectorStore")
    @patch("rag.ingest.load_rag_config")
    def test_ingest_records_empty_sources_metric(self, mock_load_config, _mock_store_cls, _mock_sources):
        mock_load_config.return_value = SimpleNamespace(
            embedding=SimpleNamespace(provider="gapgpt"),
        )

        result = ingest()

        self.assertEqual(result["chunks_added"], 0)
        self.assertEqual(METRICS["rag.ingest.empty_sources|kb_name=None"], 1)