"""Tests for deerflow.tracing.metadata.build_langfuse_trace_metadata."""

from __future__ import annotations

import pytest

from deerflow.tracing import metadata as tracing_metadata


@pytest.fixture(autouse=True)
def _clear_tracing_env(monkeypatch):
    from deerflow.config.tracing_config import reset_tracing_config

    for name in (
        "LANGFUSE_TRACING",
        "LANGFUSE_PUBLIC_KEY",
        "LANGFUSE_SECRET_KEY",
        "LANGFUSE_BASE_URL",
        "LANGSMITH_TRACING",
        "LANGCHAIN_TRACING_V2",
        "LANGCHAIN_TRACING",
        "LANGSMITH_API_KEY",
        "LANGCHAIN_API_KEY",
    ):
        monkeypatch.delenv(name, raising=False)
    reset_tracing_config()
    yield
    reset_tracing_config()


def _enable_langfuse(monkeypatch):
    monkeypatch.setenv("LANGFUSE_TRACING", "true")
    monkeypatch.setenv("LANGFUSE_PUBLIC_KEY", "pk-lf-test")
    monkeypatch.setenv("LANGFUSE_SECRET_KEY", "sk-lf-test")


def test_returns_empty_when_langfuse_disabled(monkeypatch):
    # No env vars set → langfuse not in enabled providers.
    result = tracing_metadata.build_langfuse_trace_metadata(
        thread_id="t-1",
        user_id="u-1",
        assistant_id="lead-agent",
        model_name="gpt-4o",
    )
    assert result == {}


def test_session_id_maps_to_thread_id(monkeypatch):
    _enable_langfuse(monkeypatch)

    result = tracing_metadata.build_langfuse_trace_metadata(
        thread_id="thread-abc",
        user_id="user-42",
    )

    assert result["langfuse_session_id"] == "thread-abc"


def test_user_id_falls_back_to_default(monkeypatch):
    _enable_langfuse(monkeypatch)

    result = tracing_metadata.build_langfuse_trace_metadata(
        thread_id="thread-abc",
        user_id=None,
    )

    assert result["langfuse_user_id"] == "default"


def test_user_id_explicit_value_wins(monkeypatch):
    _enable_langfuse(monkeypatch)

    result = tracing_metadata.build_langfuse_trace_metadata(
        thread_id="thread-abc",
        user_id="alice@example.com",
    )

    assert result["langfuse_user_id"] == "alice@example.com"


def test_trace_name_uses_assistant_id_when_provided(monkeypatch):
    _enable_langfuse(monkeypatch)

    result = tracing_metadata.build_langfuse_trace_metadata(
        thread_id="t",
        assistant_id="custom-agent",
    )

    assert result["langfuse_trace_name"] == "custom-agent"


def test_trace_name_defaults_to_lead_agent(monkeypatch):
    _enable_langfuse(monkeypatch)

    result = tracing_metadata.build_langfuse_trace_metadata(
        thread_id="t",
        assistant_id=None,
    )

    assert result["langfuse_trace_name"] == "lead-agent"


def test_tags_include_env_and_model(monkeypatch):
    _enable_langfuse(monkeypatch)

    result = tracing_metadata.build_langfuse_trace_metadata(
        thread_id="t",
        environment="production",
        model_name="gpt-4o",
    )

    assert result["langfuse_tags"] == ["env:production", "model:gpt-4o"]


def test_tags_omitted_when_no_tag_inputs(monkeypatch):
    _enable_langfuse(monkeypatch)

    result = tracing_metadata.build_langfuse_trace_metadata(
        thread_id="t",
        user_id="u",
    )

    assert "langfuse_tags" not in result


def test_thread_id_none_still_produces_metadata(monkeypatch):
    # Stateless run paths may not have a thread_id — we still want
    # user_id / trace_name to flow through so Users page works.
    _enable_langfuse(monkeypatch)

    result = tracing_metadata.build_langfuse_trace_metadata(
        thread_id=None,
        user_id="u-1",
    )

    assert result["langfuse_session_id"] is None
    assert result["langfuse_user_id"] == "u-1"