"""Tests for app.gateway.services — run lifecycle service layer."""

from __future__ import annotations

import json


def test_format_sse_basic():
    from app.gateway.services import format_sse

    frame = format_sse("metadata", {"run_id": "abc"})
    assert frame.startswith("event: metadata\n")
    assert "data: " in frame
    parsed = json.loads(frame.split("data: ")[1].split("\n")[0])
    assert parsed["run_id"] == "abc"


def test_format_sse_with_event_id():
    from app.gateway.services import format_sse

    frame = format_sse("metadata", {"run_id": "abc"}, event_id="123-0")
    assert "id: 123-0" in frame


def test_format_sse_end_event_null():
    from app.gateway.services import format_sse

    frame = format_sse("end", None)
    assert "data: null" in frame


def test_format_sse_no_event_id():
    from app.gateway.services import format_sse

    frame = format_sse("values", {"x": 1})
    assert "id:" not in frame


def test_normalize_stream_modes_none():
    from app.gateway.services import normalize_stream_modes

    assert normalize_stream_modes(None) == ["values"]


def test_normalize_stream_modes_string():
    from app.gateway.services import normalize_stream_modes

    assert normalize_stream_modes("messages-tuple") == ["messages-tuple"]


def test_normalize_stream_modes_list():
    from app.gateway.services import normalize_stream_modes

    assert normalize_stream_modes(["values", "messages-tuple"]) == ["values", "messages-tuple"]


def test_normalize_stream_modes_empty_list():
    from app.gateway.services import normalize_stream_modes

    assert normalize_stream_modes([]) == ["values"]


def test_normalize_input_none():
    from app.gateway.services import normalize_input

    assert normalize_input(None) == {}


def test_normalize_input_with_messages():
    from app.gateway.services import normalize_input

    result = normalize_input({"messages": [{"role": "user", "content": "hi"}]})
    assert len(result["messages"]) == 1
    assert result["messages"][0].content == "hi"


def test_normalize_input_passthrough():
    from app.gateway.services import normalize_input

    result = normalize_input({"custom_key": "value"})
    assert result == {"custom_key": "value"}


def test_normalize_input_preserves_additional_kwargs_and_id():
    """Regression: gh #3132 — frontend ships uploaded-file metadata in
    additional_kwargs.files (and a client-side message id).  The gateway must
    not strip them before the graph runs, otherwise UploadsMiddleware reports
    "(empty)" for new uploads and the frontend message loses its file chip.
    """
    from langchain_core.messages import HumanMessage

    from app.gateway.services import normalize_input

    files = [{"filename": "a.csv", "size": 100, "path": "/mnt/user-data/uploads/a.csv", "status": "uploaded"}]
    result = normalize_input(
        {
            "messages": [
                {
                    "type": "human",
                    "id": "client-msg-1",
                    "name": "user-input",
                    "content": [{"type": "text", "text": "clean it"}],
                    "additional_kwargs": {"files": files, "custom": "keep-me"},
                }
            ]
        }
    )
    assert len(result["messages"]) == 1
    msg = result["messages"][0]
    assert isinstance(msg, HumanMessage)
    assert msg.id == "client-msg-1"
    assert msg.name == "user-input"
    assert msg.content == [{"type": "text", "text": "clean it"}]
    assert msg.additional_kwargs == {"files": files, "custom": "keep-me"}


def test_normalize_input_passes_through_basemessage_instances():
    from langchain_core.messages import HumanMessage

    from app.gateway.services import normalize_input

    msg = HumanMessage(content="hello", id="m-1", additional_kwargs={"files": [{"filename": "x"}]})
    result = normalize_input({"messages": [msg]})
    assert result["messages"][0] is msg


def test_normalize_input_rejects_malformed_message_with_400():
    """Boundary validation: ``convert_to_messages`` raises ``ValueError`` when a
    message dict is missing ``role``/``type``/``content``.  ``normalize_input``
    runs inside the gateway HTTP boundary, so a malformed payload should surface
    as a 400 referencing the offending entry — not bubble up as a 500.

    Raised after the Copilot review on PR #3136.
    """
    import pytest
    from fastapi import HTTPException

    from app.gateway.services import normalize_input

    with pytest.raises(HTTPException) as excinfo:
        normalize_input({"messages": [{"role": "human", "content": "ok"}, {"oops": "no role here"}]})
    assert excinfo.value.status_code == 400
    assert "input.messages[1]" in excinfo.value.detail


def test_normalize_input_handles_non_human_roles():
    """The previous implementation collapsed every role to HumanMessage with a
    `# TODO: handle other message types` comment.  Resuming a thread with prior
    AI/tool messages would silently rewrite them as human turns — corrupting
    the conversation.  Use langchain's standard conversion so ai/system/tool
    roles round-trip correctly.
    """
    from langchain_core.messages import AIMessage, SystemMessage, ToolMessage

    from app.gateway.services import normalize_input

    result = normalize_input(
        {
            "messages": [
                {"role": "system", "content": "sys"},
                {"role": "ai", "content": "hi", "id": "ai-1"},
                {"role": "tool", "content": "result", "tool_call_id": "call-1"},
            ]
        }
    )
    types = [type(m) for m in result["messages"]]
    assert types == [SystemMessage, AIMessage, ToolMessage]
    assert result["messages"][1].id == "ai-1"
    assert result["messages"][2].tool_call_id == "call-1"


def test_build_run_config_basic():
    from app.gateway.services import build_run_config

    config = build_run_config("thread-1", None, None)
    assert config["configurable"]["thread_id"] == "thread-1"
    assert config["recursion_limit"] == 100


def test_build_run_config_with_overrides():
    from app.gateway.services import build_run_config

    config = build_run_config(
        "thread-1",
        {"configurable": {"model_name": "gpt-4"}, "tags": ["test"]},
        {"user": "alice"},
    )
    assert config["configurable"]["model_name"] == "gpt-4"
    assert config["tags"] == ["test"]
    assert config["metadata"]["user"] == "alice"


# ---------------------------------------------------------------------------
# Regression tests for issue #1644:
# assistant_id not mapped to agent_name → custom agent SOUL.md never loaded
# ---------------------------------------------------------------------------


def test_build_run_config_custom_agent_injects_agent_name():
    """Custom assistant_id must be forwarded as configurable['agent_name']."""
    from app.gateway.services import build_run_config

    config = build_run_config("thread-1", None, None, assistant_id="finalis")
    assert config["configurable"]["agent_name"] == "finalis"
    assert config["run_name"] == "finalis"


def test_build_run_config_lead_agent_no_agent_name():
    """'lead_agent' assistant_id must NOT inject configurable['agent_name']."""
    from app.gateway.services import build_run_config

    config = build_run_config("thread-1", None, None, assistant_id="lead_agent")
    assert "agent_name" not in config["configurable"]
    assert "run_name" not in config


def test_build_run_config_none_assistant_id_no_agent_name():
    """None assistant_id must NOT inject configurable['agent_name']."""
    from app.gateway.services import build_run_config

    config = build_run_config("thread-1", None, None, assistant_id=None)
    assert "agent_name" not in config["configurable"]
    assert "run_name" not in config


def test_build_run_config_explicit_agent_name_not_overwritten():
    """An explicit configurable['agent_name'] in the request must take precedence."""
    from app.gateway.services import build_run_config

    config = build_run_config(
        "thread-1",
        {"configurable": {"agent_name": "explicit-agent"}},
        None,
        assistant_id="other-agent",
    )
    assert config["configurable"]["agent_name"] == "explicit-agent"
    assert config["run_name"] == "explicit-agent"


def test_build_run_config_context_custom_agent_injects_agent_name():
    """Custom assistant_id must be forwarded as context['agent_name'] in context mode."""
    from app.gateway.services import build_run_config

    config = build_run_config(
        "thread-1",
        {"context": {"model_name": "deepseek-v3"}},
        None,
        assistant_id="finalis",
    )

    assert config["context"]["agent_name"] == "finalis"
    assert "configurable" not in config


def test_resolve_agent_factory_returns_make_lead_agent():
    """resolve_agent_factory always returns make_lead_agent regardless of assistant_id."""
    from app.gateway.services import resolve_agent_factory
    from deerflow.agents.lead_agent.agent import make_lead_agent

    assert resolve_agent_factory(None) is make_lead_agent
    assert resolve_agent_factory("lead_agent") is make_lead_agent
    assert resolve_agent_factory("finalis") is make_lead_agent
    assert resolve_agent_factory("custom-agent-123") is make_lead_agent


# ---------------------------------------------------------------------------

# ---------------------------------------------------------------------------
# Regression tests for issue #1699:
# context field in langgraph-compat requests not merged into configurable
# ---------------------------------------------------------------------------


def test_run_create_request_accepts_context():
    """RunCreateRequest must accept the ``context`` field without dropping it."""
    from app.gateway.routers.thread_runs import RunCreateRequest

    body = RunCreateRequest(
        input={"messages": [{"role": "user", "content": "hi"}]},
        context={
            "model_name": "deepseek-v3",
            "thinking_enabled": True,
            "is_plan_mode": True,
            "subagent_enabled": True,
            "thread_id": "some-thread-id",
        },
    )
    assert body.context is not None
    assert body.context["model_name"] == "deepseek-v3"
    assert body.context["is_plan_mode"] is True
    assert body.context["subagent_enabled"] is True


def test_run_create_request_context_defaults_to_none():
    """RunCreateRequest without context should default to None (backward compat)."""
    from app.gateway.routers.thread_runs import RunCreateRequest

    body = RunCreateRequest(input=None)
    assert body.context is None


def test_context_merges_into_configurable():
    """Context values must be merged into config['configurable'] by start_run.

    Since start_run is async and requires many dependencies, we test the
    merging logic directly by simulating what start_run does.
    """
    from app.gateway.services import build_run_config

    # Simulate the context merging logic from start_run
    config = build_run_config("thread-1", None, None)

    context = {
        "model_name": "deepseek-v3",
        "mode": "ultra",
        "reasoning_effort": "high",
        "thinking_enabled": True,
        "is_plan_mode": True,
        "subagent_enabled": True,
        "max_concurrent_subagents": 5,
        "thread_id": "should-be-ignored",
    }

    _CONTEXT_CONFIGURABLE_KEYS = {
        "model_name",
        "mode",
        "thinking_enabled",
        "reasoning_effort",
        "is_plan_mode",
        "subagent_enabled",
        "max_concurrent_subagents",
    }
    configurable = config.setdefault("configurable", {})
    for key in _CONTEXT_CONFIGURABLE_KEYS:
        if key in context:
            configurable.setdefault(key, context[key])

    assert config["configurable"]["model_name"] == "deepseek-v3"
    assert config["configurable"]["thinking_enabled"] is True
    assert config["configurable"]["is_plan_mode"] is True
    assert config["configurable"]["subagent_enabled"] is True
    assert config["configurable"]["max_concurrent_subagents"] == 5
    assert config["configurable"]["reasoning_effort"] == "high"
    assert config["configurable"]["mode"] == "ultra"
    # thread_id from context should NOT override the one from build_run_config
    assert config["configurable"]["thread_id"] == "thread-1"
    # Non-allowlisted keys should not appear
    assert "thread_id" not in {k for k in context if k in _CONTEXT_CONFIGURABLE_KEYS}


def test_merge_run_context_overrides_propagates_to_runtime_context():
    """Regression for issue #2677: ``agent_name`` (and other whitelisted keys) from
    ``body.context`` must be propagated into BOTH ``config['configurable']`` and
    ``config['context']``. Previously only ``configurable`` was populated, so after
    the LangGraph 1.1.x upgrade removed the fallback from ``configurable``, the
    ``setup_agent`` tool read ``runtime.context`` with ``agent_name=None`` and
    silently wrote SOUL.md to the global base_dir.
    """
    from app.gateway.services import build_run_config, merge_run_context_overrides

    config = build_run_config("thread-1", None, None)
    merge_run_context_overrides(config, {"agent_name": "my-agent", "is_bootstrap": True, "thread_id": "ignored"})

    assert config["configurable"]["agent_name"] == "my-agent"
    assert config["configurable"]["is_bootstrap"] is True
    assert config["context"]["agent_name"] == "my-agent"
    assert config["context"]["is_bootstrap"] is True
    # Non-whitelisted keys are not forwarded.
    assert "thread_id" not in config["context"]


def test_merge_run_context_overrides_noop_for_empty_context():
    from app.gateway.services import build_run_config, merge_run_context_overrides

    config = build_run_config("thread-1", None, None)
    before = {k: dict(v) if isinstance(v, dict) else v for k, v in config.items()}
    merge_run_context_overrides(config, None)
    merge_run_context_overrides(config, {})
    assert config == before


def test_context_does_not_override_existing_configurable():
    """Values already in config.configurable must NOT be overridden by context."""
    from app.gateway.services import build_run_config

    config = build_run_config(
        "thread-1",
        {"configurable": {"model_name": "gpt-4", "is_plan_mode": False}},
        None,
    )

    context = {
        "model_name": "deepseek-v3",
        "is_plan_mode": True,
        "subagent_enabled": True,
    }

    _CONTEXT_CONFIGURABLE_KEYS = {
        "model_name",
        "mode",
        "thinking_enabled",
        "reasoning_effort",
        "is_plan_mode",
        "subagent_enabled",
        "max_concurrent_subagents",
    }
    configurable = config.setdefault("configurable", {})
    for key in _CONTEXT_CONFIGURABLE_KEYS:
        if key in context:
            configurable.setdefault(key, context[key])

    # Existing values must NOT be overridden
    assert config["configurable"]["model_name"] == "gpt-4"
    assert config["configurable"]["is_plan_mode"] is False
    # New values should be added
    assert config["configurable"]["subagent_enabled"] is True


def test_inject_authenticated_user_context_overrides_client_user_id():
    """Run context should carry the authenticated user, not client-supplied user_id."""
    from types import SimpleNamespace

    from app.gateway.services import build_run_config, inject_authenticated_user_context

    config = build_run_config("thread-1", None, None)
    config["context"] = {"user_id": "spoofed-client"}
    request = SimpleNamespace(state=SimpleNamespace(user=SimpleNamespace(id="auth-user-42")))

    inject_authenticated_user_context(config, request)

    assert config["context"]["user_id"] == "auth-user-42"


# ---------------------------------------------------------------------------
# build_run_config — context / configurable precedence (LangGraph >= 0.6.0)
# ---------------------------------------------------------------------------


def test_build_run_config_with_context():
    """When caller sends 'context', prefer it over 'configurable'."""
    from app.gateway.services import build_run_config

    config = build_run_config(
        "thread-1",
        {"context": {"user_id": "u-42", "thread_id": "thread-1"}},
        None,
    )
    assert "context" in config
    assert config["context"]["user_id"] == "u-42"
    assert "configurable" not in config
    assert config["recursion_limit"] == 100


def test_build_run_config_null_context_becomes_empty_context():
    """When caller sends context=null, treat it as an empty context object."""
    from app.gateway.services import build_run_config

    config = build_run_config("thread-1", {"context": None}, None)

    assert config["context"] == {}
    assert "configurable" not in config


def test_build_run_config_rejects_non_mapping_context():
    """When caller sends a non-object context, raise a clear error instead of a TypeError."""
    import pytest

    from app.gateway.services import build_run_config

    with pytest.raises(ValueError, match="context"):
        build_run_config("thread-1", {"context": "bad-context"}, None)


def test_build_run_config_null_context_custom_agent_injects_agent_name():
    """Custom assistant_id can still be injected when context=null starts context mode."""
    from app.gateway.services import build_run_config

    config = build_run_config("thread-1", {"context": None}, None, assistant_id="finalis")

    assert config["context"] == {"agent_name": "finalis"}
    assert "configurable" not in config


def test_build_run_config_context_plus_configurable_warns(caplog):
    """When caller sends both 'context' and 'configurable', prefer 'context' and log a warning."""
    import logging

    from app.gateway.services import build_run_config

    with caplog.at_level(logging.WARNING, logger="app.gateway.services"):
        config = build_run_config(
            "thread-1",
            {
                "context": {"user_id": "u-42"},
                "configurable": {"model_name": "gpt-4"},
            },
            None,
        )
    assert "context" in config
    assert config["context"]["user_id"] == "u-42"
    assert "configurable" not in config
    assert any("both 'context' and 'configurable'" in r.message for r in caplog.records)


def test_build_run_config_context_passthrough_other_keys():
    """Non-conflicting keys from request_config are still passed through when context is used."""
    from app.gateway.services import build_run_config

    config = build_run_config(
        "thread-1",
        {"context": {"thread_id": "thread-1"}, "tags": ["prod"]},
        None,
    )
    assert config["context"]["thread_id"] == "thread-1"
    assert "configurable" not in config
    assert config["tags"] == ["prod"]


def test_build_run_config_no_request_config():
    """When request_config is None, fall back to basic configurable with thread_id."""
    from app.gateway.services import build_run_config

    config = build_run_config("thread-abc", None, None)
    assert config["configurable"] == {"thread_id": "thread-abc"}
    assert "context" not in config
