from typing import Dict, Any

import pytest

from haystack.preview import Pipeline, DeserializationError
from haystack.preview.testing.factory import document_store_class
from haystack.preview.components.retrievers.memory_embedding_retriever import MemoryEmbeddingRetriever
from haystack.preview.dataclasses import Document
from haystack.preview.document_stores import MemoryDocumentStore


class TestMemoryEmbeddingRetriever:
    @pytest.mark.unit
    def test_init_default(self):
        retriever = MemoryEmbeddingRetriever(MemoryDocumentStore())
        assert retriever.filters is None
        assert retriever.top_k == 10
        assert retriever.scale_score

    @pytest.mark.unit
    def test_init_with_parameters(self):
        retriever = MemoryEmbeddingRetriever(
            MemoryDocumentStore(), filters={"name": "test.txt"}, top_k=5, scale_score=False
        )
        assert retriever.filters == {"name": "test.txt"}
        assert retriever.top_k == 5
        assert not retriever.scale_score

    @pytest.mark.unit
    def test_init_with_invalid_top_k_parameter(self):
        with pytest.raises(ValueError, match="top_k must be > 0, but got -2"):
            MemoryEmbeddingRetriever(MemoryDocumentStore(), top_k=-2, scale_score=False)

    @pytest.mark.unit
    def test_to_dict(self):
        MyFakeStore = document_store_class("MyFakeStore", bases=(MemoryDocumentStore,))
        document_store = MyFakeStore()
        document_store.to_dict = lambda: {"type": "MyFakeStore", "init_parameters": {}}
        component = MemoryEmbeddingRetriever(document_store=document_store)

        data = component.to_dict()
        assert data == {
            "type": "MemoryEmbeddingRetriever",
            "init_parameters": {
                "document_store": {"type": "MyFakeStore", "init_parameters": {}},
                "filters": None,
                "top_k": 10,
                "scale_score": True,
                "return_embedding": False,
            },
        }

    @pytest.mark.unit
    def test_to_dict_with_custom_init_parameters(self):
        MyFakeStore = document_store_class("MyFakeStore", bases=(MemoryDocumentStore,))
        document_store = MyFakeStore()
        document_store.to_dict = lambda: {"type": "MyFakeStore", "init_parameters": {}}
        component = MemoryEmbeddingRetriever(
            document_store=document_store,
            filters={"name": "test.txt"},
            top_k=5,
            scale_score=False,
            return_embedding=True,
        )
        data = component.to_dict()
        assert data == {
            "type": "MemoryEmbeddingRetriever",
            "init_parameters": {
                "document_store": {"type": "MyFakeStore", "init_parameters": {}},
                "filters": {"name": "test.txt"},
                "top_k": 5,
                "scale_score": False,
                "return_embedding": True,
            },
        }

    @pytest.mark.unit
    def test_from_dict(self):
        document_store_class("MyFakeStore", bases=(MemoryDocumentStore,))
        data = {
            "type": "MemoryEmbeddingRetriever",
            "init_parameters": {
                "document_store": {"type": "MyFakeStore", "init_parameters": {}},
                "filters": {"name": "test.txt"},
                "top_k": 5,
            },
        }
        component = MemoryEmbeddingRetriever.from_dict(data)
        assert isinstance(component.document_store, MemoryDocumentStore)
        assert component.filters == {"name": "test.txt"}
        assert component.top_k == 5
        assert component.scale_score

    @pytest.mark.unit
    def test_from_dict_without_docstore(self):
        data = {"type": "MemoryEmbeddingRetriever", "init_parameters": {}}
        with pytest.raises(DeserializationError, match="Missing 'document_store' in serialization data"):
            MemoryEmbeddingRetriever.from_dict(data)

    @pytest.mark.unit
    def test_from_dict_without_docstore_type(self):
        data = {"type": "MemoryEmbeddingRetriever", "init_parameters": {"document_store": {"init_parameters": {}}}}
        with pytest.raises(DeserializationError, match="Missing 'type' in document store's serialization data"):
            MemoryEmbeddingRetriever.from_dict(data)

    @pytest.mark.unit
    def test_from_dict_nonexisting_docstore(self):
        data = {
            "type": "MemoryEmbeddingRetriever",
            "init_parameters": {"document_store": {"type": "NonexistingDocstore", "init_parameters": {}}},
        }
        with pytest.raises(DeserializationError, match="DocumentStore type 'NonexistingDocstore' not found"):
            MemoryEmbeddingRetriever.from_dict(data)

    @pytest.mark.unit
    def test_valid_run(self):
        top_k = 3
        ds = MemoryDocumentStore(embedding_similarity_function="cosine")
        docs = [
            Document(text="my document", embedding=[0.1, 0.2, 0.3, 0.4]),
            Document(text="another document", embedding=[1.0, 1.0, 1.0, 1.0]),
            Document(text="third document", embedding=[0.5, 0.7, 0.5, 0.7]),
        ]
        ds.write_documents(docs)

        retriever = MemoryEmbeddingRetriever(ds, top_k=top_k)
        result = retriever.run(query_embedding=[0.1, 0.1, 0.1, 0.1], return_embedding=True)

        assert "documents" in result
        assert len(result["documents"]) == top_k
        assert result["documents"][0].embedding == [1.0, 1.0, 1.0, 1.0]

    @pytest.mark.unit
    def test_invalid_run_wrong_store_type(self):
        SomeOtherDocumentStore = document_store_class("SomeOtherDocumentStore")
        with pytest.raises(ValueError, match="document_store must be an instance of MemoryDocumentStore"):
            MemoryEmbeddingRetriever(SomeOtherDocumentStore())

    @pytest.mark.integration
    def test_run_with_pipeline(self):
        ds = MemoryDocumentStore(embedding_similarity_function="cosine")
        top_k = 2
        docs = [
            Document(text="my document", embedding=[0.1, 0.2, 0.3, 0.4]),
            Document(text="another document", embedding=[1.0, 1.0, 1.0, 1.0]),
            Document(text="third document", embedding=[0.5, 0.7, 0.5, 0.7]),
        ]
        ds.write_documents(docs)
        retriever = MemoryEmbeddingRetriever(ds, top_k=top_k)

        pipeline = Pipeline()
        pipeline.add_component("retriever", retriever)
        result: Dict[str, Any] = pipeline.run(
            data={"retriever": {"query_embedding": [0.1, 0.1, 0.1, 0.1], "return_embedding": True}}
        )

        assert result
        assert "retriever" in result
        results_docs = result["retriever"]["documents"]
        assert results_docs
        assert len(results_docs) == top_k
        assert results_docs[0].embedding == [1.0, 1.0, 1.0, 1.0]