"""Test Qdrant functionality."""
from typing import Callable, Optional

import pytest

from langchain.docstore.document import Document
from langchain.embeddings.base import Embeddings
from langchain.vectorstores import Qdrant
from tests.integration_tests.vectorstores.fake_embeddings import FakeEmbeddings


@pytest.mark.parametrize(
    ["content_payload_key", "metadata_payload_key"],
    [
        (Qdrant.CONTENT_KEY, Qdrant.METADATA_KEY),
        ("foo", "bar"),
        (Qdrant.CONTENT_KEY, "bar"),
        ("foo", Qdrant.METADATA_KEY),
    ],
)
def test_qdrant(content_payload_key: str, metadata_payload_key: str) -> None:
    """Test end to end construction and search."""
    texts = ["foo", "bar", "baz"]
    docsearch = Qdrant.from_texts(
        texts,
        FakeEmbeddings(),
        location=":memory:",
        content_payload_key=content_payload_key,
        metadata_payload_key=metadata_payload_key,
    )
    output = docsearch.similarity_search("foo", k=1)
    assert output == [Document(page_content="foo")]


def test_qdrant_add_documents() -> None:
    """Test end to end construction and search."""
    texts = ["foo", "bar", "baz"]
    docsearch: Qdrant = Qdrant.from_texts(texts, FakeEmbeddings(), location=":memory:")

    new_texts = ["foobar", "foobaz"]
    docsearch.add_documents([Document(page_content=content) for content in new_texts])
    output = docsearch.similarity_search("foobar", k=1)
    # FakeEmbeddings return the same query embedding as the first document embedding
    # computed in `embedding.embed_documents`. Since embed_documents is called twice,
    # "foo" embedding is the same as "foobar" embedding
    assert output == [Document(page_content="foobar")] or output == [
        Document(page_content="foo")
    ]


@pytest.mark.parametrize(
    ["content_payload_key", "metadata_payload_key"],
    [
        (Qdrant.CONTENT_KEY, Qdrant.METADATA_KEY),
        ("test_content", "test_payload"),
        (Qdrant.CONTENT_KEY, "payload_test"),
        ("content_test", Qdrant.METADATA_KEY),
    ],
)
def test_qdrant_with_metadatas(
    content_payload_key: str, metadata_payload_key: str
) -> None:
    """Test end to end construction and search."""
    texts = ["foo", "bar", "baz"]
    metadatas = [{"page": i} for i in range(len(texts))]
    docsearch = Qdrant.from_texts(
        texts,
        FakeEmbeddings(),
        metadatas=metadatas,
        location=":memory:",
        content_payload_key=content_payload_key,
        metadata_payload_key=metadata_payload_key,
    )
    output = docsearch.similarity_search("foo", k=1)
    assert output == [Document(page_content="foo", metadata={"page": 0})]


def test_qdrant_similarity_search_filters() -> None:
    """Test end to end construction and search."""
    texts = ["foo", "bar", "baz"]
    metadatas = [
        {"page": i, "metadata": {"page": i + 1, "pages": [i + 2, -1]}}
        for i in range(len(texts))
    ]
    docsearch = Qdrant.from_texts(
        texts,
        FakeEmbeddings(),
        metadatas=metadatas,
        location=":memory:",
    )

    output = docsearch.similarity_search(
        "foo", k=1, filter={"page": 1, "metadata": {"page": 2, "pages": [3]}}
    )
    assert output == [
        Document(
            page_content="bar",
            metadata={"page": 1, "metadata": {"page": 2, "pages": [3, -1]}},
        )
    ]


@pytest.mark.parametrize(
    ["content_payload_key", "metadata_payload_key"],
    [
        (Qdrant.CONTENT_KEY, Qdrant.METADATA_KEY),
        ("test_content", "test_payload"),
        (Qdrant.CONTENT_KEY, "payload_test"),
        ("content_test", Qdrant.METADATA_KEY),
    ],
)
def test_qdrant_max_marginal_relevance_search(
    content_payload_key: str, metadata_payload_key: str
) -> None:
    """Test end to end construction and MRR search."""
    texts = ["foo", "bar", "baz"]
    metadatas = [{"page": i} for i in range(len(texts))]
    docsearch = Qdrant.from_texts(
        texts,
        FakeEmbeddings(),
        metadatas=metadatas,
        location=":memory:",
        content_payload_key=content_payload_key,
        metadata_payload_key=metadata_payload_key,
    )
    output = docsearch.max_marginal_relevance_search("foo", k=2, fetch_k=3)
    assert output == [
        Document(page_content="foo", metadata={"page": 0}),
        Document(page_content="bar", metadata={"page": 1}),
    ]


@pytest.mark.parametrize(
    ["embeddings", "embedding_function"],
    [
        (FakeEmbeddings(), None),
        (FakeEmbeddings().embed_query, None),
        (None, FakeEmbeddings().embed_query),
    ],
)
def test_qdrant_embedding_interface(
    embeddings: Optional[Embeddings], embedding_function: Optional[Callable]
) -> None:
    from qdrant_client import QdrantClient

    client = QdrantClient(":memory:")
    collection_name = "test"

    Qdrant(
        client,
        collection_name,
        embeddings=embeddings,
        embedding_function=embedding_function,
    )


@pytest.mark.parametrize(
    ["embeddings", "embedding_function"],
    [
        (FakeEmbeddings(), FakeEmbeddings().embed_query),
        (None, None),
    ],
)
def test_qdrant_embedding_interface_raises(
    embeddings: Optional[Embeddings], embedding_function: Optional[Callable]
) -> None:
    from qdrant_client import QdrantClient

    client = QdrantClient(":memory:")
    collection_name = "test"

    with pytest.raises(ValueError):
        Qdrant(
            client,
            collection_name,
            embeddings=embeddings,
            embedding_function=embedding_function,
        )