import os
from unittest.mock import Mock, patch

import pytest

from mem0.configs.base import MemoryConfig
from mem0.memory.main import Memory


@pytest.fixture(autouse=True)
def mock_openai():
    os.environ["OPENAI_API_KEY"] = "123"
    with patch("openai.OpenAI") as mock:
        mock.return_value = Mock()
        yield mock


@pytest.fixture
def memory_instance():
    with (
        patch("mem0.utils.factory.EmbedderFactory") as mock_embedder,
        patch("mem0.memory.main.VectorStoreFactory") as mock_vector_store,
        patch("mem0.utils.factory.LlmFactory") as mock_llm,
        patch("mem0.memory.telemetry.capture_event"),
    ):
        mock_embedder.create.return_value = Mock()
        mock_vector_store.create.return_value = Mock()
        mock_vector_store.create.return_value.search.return_value = []
        mock_llm.create.return_value = Mock()

        config = MemoryConfig(version="v1.1")
        return Memory(config)


@pytest.fixture
def memory_custom_instance():
    with (
        patch("mem0.utils.factory.EmbedderFactory") as mock_embedder,
        patch("mem0.memory.main.VectorStoreFactory") as mock_vector_store,
        patch("mem0.utils.factory.LlmFactory") as mock_llm,
        patch("mem0.memory.telemetry.capture_event"),
    ):
        mock_embedder.create.return_value = Mock()
        mock_vector_store.create.return_value = Mock()
        mock_vector_store.create.return_value.search.return_value = []
        mock_llm.create.return_value = Mock()

        config = MemoryConfig(
            version="v1.1",
            custom_instructions="custom prompt extracting memory in json format",
        )
        return Memory(config)


@pytest.mark.parametrize("version", ["v1.0", "v1.1"])
def test_add(memory_instance, version):
    memory_instance.config.version = version
    memory_instance._add_to_vector_store = Mock(return_value=[{"memory": "Test memory", "event": "ADD"}])

    result = memory_instance.add(messages=[{"role": "user", "content": "Test message"}], user_id="test_user")

    assert "results" in result
    assert result["results"] == [{"memory": "Test memory", "event": "ADD"}]

    memory_instance._add_to_vector_store.assert_called_once_with(
        [{"role": "user", "content": "Test message"}], {"user_id": "test_user"}, {"user_id": "test_user"}, True
    )


def test_get(memory_instance):
    mock_memory = Mock(
        id="test_id",
        payload={
            "data": "Test memory",
            "user_id": "test_user",
            "hash": "test_hash",
            "created_at": "2023-01-01T00:00:00",
            "updated_at": "2023-01-02T00:00:00",
            "extra_field": "extra_value",
        },
    )
    memory_instance.vector_store.get = Mock(return_value=mock_memory)

    result = memory_instance.get("test_id")

    assert result["id"] == "test_id"
    assert result["memory"] == "Test memory"
    assert result["user_id"] == "test_user"
    assert result["hash"] == "test_hash"
    assert result["created_at"] == "2023-01-01T00:00:00"
    assert result["updated_at"] == "2023-01-02T00:00:00"
    assert result["metadata"] == {"extra_field": "extra_value"}


@pytest.mark.parametrize("version", ["v1.0", "v1.1"])
def test_search(memory_instance, version):
    memory_instance.config.version = version
    mock_memories = [
        Mock(id="1", payload={"data": "Memory 1", "user_id": "test_user"}, score=0.9),
        Mock(id="2", payload={"data": "Memory 2", "user_id": "test_user"}, score=0.8),
    ]
    memory_instance.vector_store.search = Mock(return_value=mock_memories)
    memory_instance.vector_store.keyword_search = Mock(return_value=None)  # No BM25
    memory_instance.embedding_model.embed = Mock(return_value=[0.1, 0.2, 0.3])

    with patch("mem0.memory.main.lemmatize_for_bm25", return_value="test query"), \
         patch("mem0.memory.main.extract_entities", return_value=[]):
        result = memory_instance.search("test query", user_id="test_user")

    assert "results" in result
    assert len(result["results"]) == 2
    assert result["results"][0]["id"] == "1"
    assert result["results"][0]["memory"] == "Memory 1"
    assert result["results"][0]["user_id"] == "test_user"
    # Score is now combined score (semantic only since no BM25/entity), still 0.9
    assert result["results"][0]["score"] == pytest.approx(0.9)
    assert "score_breakdown" in result["results"][0]

    # Hybrid pipeline over-fetches: max(100*4, 60) = 400
    memory_instance.vector_store.search.assert_called_once_with(
        query="test query", vectors=[0.1, 0.2, 0.3], top_k=400, filters={"user_id": "test_user"}
    )


def test_update(memory_instance):
    memory_instance.embedding_model = Mock()
    memory_instance.embedding_model.embed = Mock(return_value=[0.1, 0.2, 0.3])

    memory_instance._update_memory = Mock()

    result = memory_instance.update("test_id", "Updated memory")

    memory_instance._update_memory.assert_called_once_with(
        "test_id", "Updated memory", {"Updated memory": [0.1, 0.2, 0.3]}, None
    )

    assert result["message"] == "Memory updated successfully!"


def test_update_with_metadata(memory_instance):
    memory_instance.embedding_model = Mock()
    memory_instance.embedding_model.embed = Mock(return_value=[0.1, 0.2, 0.3])

    memory_instance._update_memory = Mock()
    metadata = {"category": "sports", "priority": "high"}

    result = memory_instance.update("test_id", "Updated memory", metadata=metadata)

    memory_instance._update_memory.assert_called_once_with(
        "test_id", "Updated memory", {"Updated memory": [0.1, 0.2, 0.3]}, metadata
    )

    assert result["message"] == "Memory updated successfully!"


def test_update_with_empty_metadata(memory_instance):
    memory_instance.embedding_model = Mock()
    memory_instance.embedding_model.embed = Mock(return_value=[0.1, 0.2, 0.3])

    memory_instance._update_memory = Mock()

    memory_instance.update("test_id", "Updated memory", metadata={})

    memory_instance._update_memory.assert_called_once_with(
        "test_id", "Updated memory", {"Updated memory": [0.1, 0.2, 0.3]}, {}
    )


def test_delete(memory_instance):
    memory_instance._delete_memory = Mock()

    result = memory_instance.delete("test_id")

    # delete() now fetches the memory first and passes it to _delete_memory
    existing_memory = memory_instance.vector_store.get.return_value
    memory_instance._delete_memory.assert_called_once_with("test_id", existing_memory)
    assert result["message"] == "Memory deleted successfully!"


@pytest.mark.parametrize("version", ["v1.0", "v1.1"])
def test_delete_all(memory_instance, version):
    memory_instance.config.version = version
    mock_memories = [Mock(id="1"), Mock(id="2")]
    memory_instance.vector_store.list = Mock(return_value=(mock_memories, None))
    memory_instance.vector_store.reset = Mock()
    memory_instance._delete_memory = Mock()

    result = memory_instance.delete_all(user_id="test_user")

    assert memory_instance._delete_memory.call_count == 2
    # Ensure the collection is NOT dropped — only matched memories should be removed
    memory_instance.vector_store.reset.assert_not_called()

    assert result["message"] == "Memories deleted successfully!"


@pytest.mark.parametrize(
    "version, expected_result",
    [
        ("v1.0", {"results": [{"id": "1", "memory": "Memory 1", "user_id": "test_user"}]}),
        ("v1.1", {"results": [{"id": "1", "memory": "Memory 1", "user_id": "test_user"}]}),
    ],
)
def test_get_all(memory_instance, version, expected_result):
    memory_instance.config.version = version
    mock_memories = [Mock(id="1", payload={"data": "Memory 1", "user_id": "test_user"})]
    memory_instance.vector_store.list = Mock(return_value=(mock_memories, None))

    result = memory_instance.get_all(user_id="test_user")

    assert isinstance(result, dict)
    assert "results" in result
    assert len(result["results"]) == len(expected_result["results"])
    for expected_item, result_item in zip(expected_result["results"], result["results"]):
        assert all(key in result_item for key in expected_item)
        assert result_item["id"] == expected_item["id"]
        assert result_item["memory"] == expected_item["memory"]
        assert result_item["user_id"] == expected_item["user_id"]

    memory_instance.vector_store.list.assert_called_once_with(filters={"user_id": "test_user"}, top_k=100)


def test_no_telemetry_vector_store_when_disabled():
    """VectorStoreFactory should only be called once (for user data) when telemetry is disabled."""
    with (
        patch("mem0.memory.main.MEM0_TELEMETRY", False),
        patch("mem0.utils.factory.EmbedderFactory") as mock_embedder,
        patch("mem0.memory.main.VectorStoreFactory") as mock_vector_store,
        patch("mem0.utils.factory.LlmFactory") as mock_llm,
        patch("mem0.memory.telemetry.capture_event"),
    ):
        mock_embedder.create.return_value = Mock()
        mock_vector_store.create.return_value = Mock()
        mock_llm.create.return_value = Mock()

        config = MemoryConfig(version="v1.1")
        Memory(config)

        # VectorStoreFactory.create should be called exactly once — for user data only, not telemetry
        assert mock_vector_store.create.call_count == 1


def test_telemetry_vector_store_created_when_enabled():
    """VectorStoreFactory should be called twice (user data + telemetry) when telemetry is enabled."""
    with (
        patch("mem0.memory.main.MEM0_TELEMETRY", True),
        patch("mem0.utils.factory.EmbedderFactory") as mock_embedder,
        patch("mem0.memory.main.VectorStoreFactory") as mock_vector_store,
        patch("mem0.utils.factory.LlmFactory") as mock_llm,
        patch("mem0.memory.telemetry.capture_event"),
    ):
        mock_embedder.create.return_value = Mock()
        mock_vector_store.create.return_value = Mock()
        mock_llm.create.return_value = Mock()

        config = MemoryConfig(version="v1.1")
        Memory(config)

        # VectorStoreFactory.create should be called twice — user data + telemetry
        assert mock_vector_store.create.call_count == 2