"""
Embedding 服务单元测试
"""
from __future__ import annotations

import pytest
from unittest.mock import patch, AsyncMock
from app.services.embedding_service import EmbeddingService


class TestEmbeddingService:
    """Embedding 服务测试"""

    @pytest.mark.unit
    @pytest.mark.asyncio
    async def test_cosine_similarity_identical(self):
        from app.services.embedding_service import EmbeddingService

        a = [1.0, 0.0, 0.0]
        b = [1.0, 0.0, 0.0]
        sim = EmbeddingService.cosine_similarity(a, b)
        assert sim == pytest.approx(1.0, abs=1e-6)

    @pytest.mark.unit
    def test_cosine_similarity_orthogonal(self):
        from app.services.embedding_service import EmbeddingService

        a = [1.0, 0.0]
        b = [0.0, 1.0]
        sim = EmbeddingService.cosine_similarity(a, b)
        assert sim == pytest.approx(0.0, abs=1e-6)

    @pytest.mark.unit
    def test_cosine_similarity_opposite(self):
        from app.services.embedding_service import EmbeddingService

        a = [1.0, 0.0]
        b = [-1.0, 0.0]
        sim = EmbeddingService.cosine_similarity(a, b)
        assert sim == pytest.approx(-1.0, abs=1e-6)

    @pytest.mark.unit
    @pytest.mark.asyncio
    async def test_similarity_search_empty(self):
        from app.services.embedding_service import EmbeddingService

        svc = EmbeddingService()
        results = await svc.similarity_search(
            [1.0, 0.0], [], top_k=5
        )
        assert results == []

    @pytest.mark.unit
    @pytest.mark.asyncio
    async def test_similarity_search_ordering(self):
        from app.services.embedding_service import EmbeddingService

        svc = EmbeddingService()
        entries = [
            {"content_text": "dogs are great pets", "embedding": [0.9, 0.0, 0.0]},
            {"content_text": "cats are independent", "embedding": [0.1, 0.0, 0.0]},
        ]
        query = [0.8, 0.0, 0.0]
        results = await svc.similarity_search(query, entries, top_k=3, min_score=0.0)
        assert len(results) == 2
        assert results[0]["content_text"] == "dogs are great pets"

    @pytest.mark.unit
    @pytest.mark.asyncio
    async def test_similarity_search_top_k(self):
        from app.services.embedding_service import EmbeddingService

        svc = EmbeddingService()
        entries = [
            {"content_text": f"entry {i}", "embedding": [float(i) / 10, 0.0]} for i in range(10)
        ]
        query = [1.0, 0.0]
        results = await svc.similarity_search(query, entries, top_k=3)
        assert len(results) == 3

    @pytest.mark.unit
    @pytest.mark.asyncio
    async def test_similarity_search_min_score(self):
        from app.services.embedding_service import EmbeddingService

        svc = EmbeddingService()
        entries = [
            {"content_text": "close match", "embedding": [0.9, 0.0]},
            {"content_text": "distant match", "embedding": [-0.5, 0.0]},
        ]
        query = [1.0, 0.0]
        results = await svc.similarity_search(query, entries, top_k=5, min_score=0.5)
        assert len(results) == 1
        assert results[0]["content_text"] == "close match"

    @pytest.mark.unit
    @pytest.mark.asyncio
    async def test_generate_embedding_empty(self):
        from app.services.embedding_service import EmbeddingService

        svc = EmbeddingService()
        result = await svc.generate_embedding("")
        assert result is None

    @pytest.mark.unit
    @pytest.mark.asyncio
    async def test_generate_embedding_no_api_key(self):
        """无 API Key 时返回 None"""
        from app.services.embedding_service import EmbeddingService

        svc = EmbeddingService()
        with patch.object(svc, "_get_client", AsyncMock(return_value=None)):
            result = await svc.generate_embedding("test")
            assert result is None

    @pytest.mark.unit
    @pytest.mark.asyncio
    async def test_generate_embeddings_empty(self):
        from app.services.embedding_service import EmbeddingService

        svc = EmbeddingService()
        result = await svc.generate_embeddings([])
        assert result == []

    @pytest.mark.unit
    def test_serialize_deserialize(self):
        from app.services.embedding_service import EmbeddingService

        emb = [0.1, 0.2, 0.3]
        serialized = EmbeddingService.serialize_embedding(emb)
        deserialized = EmbeddingService.deserialize_embedding(serialized)
        assert deserialized == emb

    @pytest.mark.unit
    def test_deserialize_invalid(self):
        from app.services.embedding_service import EmbeddingService

        result = EmbeddingService.deserialize_embedding("invalid json")
        assert result == []

    @pytest.mark.unit
    def test_deserialize_list_already(self):
        from app.services.embedding_service import EmbeddingService

        result = EmbeddingService.deserialize_embedding([1.0, 2.0])
        assert result == [1.0, 2.0]