"""Step definitions for the LLM trace observability feature."""

from __future__ import annotations

import builtins
import os
from datetime import datetime
from typing import Any
from unittest.mock import MagicMock, patch

from behave import given, then, when
from behave.runner import Context
from pydantic import ValidationError
from sqlalchemy import create_engine
from sqlalchemy.exc import DatabaseError as SQLAlchemyDatabaseError
from sqlalchemy.orm import sessionmaker

from cleveragents.application.services.trace_service import (
    TraceService,
    _forward_trace_to_langsmith,
)
from cleveragents.core.exceptions import DatabaseError as AppDatabaseError
from cleveragents.domain.models.observability.llm_trace import LLMTrace, LLMTraceQuery
from cleveragents.domain.models.observability.metrics import (
    MetricCollector,
    MetricEntry,
    OperationalMetricKey,
)
from cleveragents.infrastructure.database.llm_trace_repository import LLMTraceRepository
from cleveragents.infrastructure.database.models import Base, LLMTraceModel

# ---------------------------------------------------------------------------
# Test constants
# ---------------------------------------------------------------------------

VALID_ULID_1 = "01HXAAAAAAAAAAAAAAAAAAAAAA"
VALID_ULID_2 = "01HXBBBBBBBBBBBBBBBBBBBBBB"
VALID_ULID_3 = "01HXCCCCCCCCCCCCCCCCCCCCCC"
VALID_PLAN_ID = "01HX0000000000PPPPPPPPPPPP"
VALID_DECISION_ID = "01HX0000000000DDDDDDDDDDDD"


def _make_trace(
    trace_id: str = VALID_ULID_1,
    plan_id: str = VALID_PLAN_ID,
    decision_id: str | None = None,
    actor: str = "planner",
    provider: str = "openai",
    model: str = "gpt-4o",
    prompt_tokens: int = 500,
    completion_tokens: int = 200,
    cost_usd: float = 0.01,
    latency_ms: float = 350.0,
    **kwargs: Any,
) -> LLMTrace:
    """Build a test LLMTrace with sensible defaults."""
    return LLMTrace(
        trace_id=trace_id,
        plan_id=plan_id,
        decision_id=decision_id,
        actor=actor,
        provider=provider,
        model=model,
        prompt_tokens=prompt_tokens,
        completion_tokens=completion_tokens,
        cost_usd=cost_usd,
        latency_ms=latency_ms,
        **kwargs,
    )


# ---------------------------------------------------------------------------
# In-memory repository stub
# ---------------------------------------------------------------------------


class InMemoryLLMTraceRepository:
    """Minimal in-memory repository for test isolation."""

    def __init__(self) -> None:
        self._store: dict[str, LLMTrace] = {}

    def save(self, trace: LLMTrace) -> None:
        self._store[trace.trace_id] = trace

    def get(self, trace_id: str) -> LLMTrace | None:
        return self._store.get(trace_id)

    def list_by_plan(self, plan_id: str) -> list[LLMTrace]:
        return sorted(
            (t for t in self._store.values() if t.plan_id == plan_id),
            key=lambda t: t.timestamp.isoformat(),
        )

    def list_by_decision(self, decision_id: str) -> list[LLMTrace]:
        return sorted(
            (t for t in self._store.values() if t.decision_id == decision_id),
            key=lambda t: t.timestamp.isoformat(),
        )


# ---------------------------------------------------------------------------
# Background
# ---------------------------------------------------------------------------


@given("a trace service with an in-memory repository")
def step_create_service(context: Context) -> None:
    context.repo = InMemoryLLMTraceRepository()
    context.settings = MagicMock()
    context.service = TraceService(
        settings=context.settings,
        repository=context.repo,  # type: ignore[arg-type]
    )
    context.error = None
    context.traces_list = []  # list[LLMTrace]
    context.metrics_list = []  # list[MetricEntry]
    context.langsmith_called = False
    # Ensure LANGCHAIN_TRACING_V2 is unset by default
    os.environ.pop("LANGCHAIN_TRACING_V2", None)


# ---------------------------------------------------------------------------
# Model validation
# ---------------------------------------------------------------------------


@given("a valid LLM trace payload")
def step_valid_payload(context: Context) -> None:
    context.trace_kwargs = {
        "trace_id": VALID_ULID_1,
        "plan_id": VALID_PLAN_ID,
        "actor": "planner",
        "provider": "openai",
        "model": "gpt-4o",
        "prompt_tokens": 500,
        "completion_tokens": 200,
        "cost_usd": 0.01,
        "latency_ms": 350.0,
    }


@given("a minimal LLM trace payload")
def step_minimal_payload(context: Context) -> None:
    context.trace_kwargs = {
        "trace_id": VALID_ULID_1,
        "plan_id": VALID_PLAN_ID,
        "actor": "planner",
        "provider": "openai",
        "model": "gpt-4o",
        "prompt_tokens": 0,
        "completion_tokens": 0,
        "cost_usd": 0.0,
        "latency_ms": 0.0,
    }


@when("I create the LLM trace model")
def step_create_model(context: Context) -> None:
    try:
        context.trace = LLMTrace(**context.trace_kwargs)
    except ValidationError as exc:
        context.error = exc


@when("I create a trace with an invalid trace_id")
def step_invalid_trace_id(context: Context) -> None:
    try:
        _make_trace(trace_id="INVALID")
    except ValidationError as exc:
        context.error = exc


@when("I create a trace with negative prompt_tokens")
def step_negative_prompt(context: Context) -> None:
    try:
        _make_trace(prompt_tokens=-1)
    except ValidationError as exc:
        context.error = exc


@when("I create a trace with negative cost_usd")
def step_negative_cost(context: Context) -> None:
    try:
        _make_trace(cost_usd=-0.5)
    except ValidationError as exc:
        context.error = exc


@then("the trace should have all required fields populated")
def step_all_fields(context: Context) -> None:
    t = context.trace
    assert t.trace_id == VALID_ULID_1
    assert t.plan_id == VALID_PLAN_ID
    assert t.actor == "planner"
    assert t.provider == "openai"
    assert t.model == "gpt-4o"
    assert t.prompt_tokens == 500
    assert t.completion_tokens == 200


@then("the trace should be frozen")
def step_frozen(context: Context) -> None:
    try:
        context.trace.actor = "modified"  # type: ignore[misc]
        raise AssertionError("Expected frozen model to reject assignment")
    except ValidationError:
        pass


@then("the trace decision_id should be None")
def step_decision_none(context: Context) -> None:
    assert context.trace.decision_id is None


@then("the trace tool_calls should be empty")
def step_tool_calls_empty(context: Context) -> None:
    assert context.trace.tool_calls == []


@then("the trace context_hash should be None")
def step_context_hash_none(context: Context) -> None:
    assert context.trace.context_hash is None


@then("the trace streaming should be False")
def step_streaming_false(context: Context) -> None:
    assert context.trace.streaming is False


@then("the trace retry_count should be 0")
def step_retry_zero(context: Context) -> None:
    assert context.trace.retry_count == 0


@then("the trace error should be None")
def step_error_none(context: Context) -> None:
    assert context.trace.error is None


# ---------------------------------------------------------------------------
# Query model
# ---------------------------------------------------------------------------


@when("I create a trace query with plan_id filter")
def step_create_query(context: Context) -> None:
    context.query = LLMTraceQuery(plan_id=VALID_PLAN_ID)


@when("I create a trace query with limit {limit:d}")
def step_query_bad_limit(context: Context, limit: int) -> None:
    try:
        LLMTraceQuery(limit=limit)
    except ValidationError as exc:
        context.error = exc


@then("the query should have default limit {limit:d}")
def step_query_limit(context: Context, limit: int) -> None:
    assert context.query.limit == limit


@then("the query should have default offset {offset:d}")
def step_query_offset(context: Context, offset: int) -> None:
    assert context.query.offset == offset


# ---------------------------------------------------------------------------
# Metric keys
# ---------------------------------------------------------------------------


@then("the OperationalMetricKey enum should have exactly {count:d} members")
def step_metric_key_count(context: Context, count: int) -> None:
    assert len(OperationalMetricKey) == count


@then('PLAN_DURATION_MS should equal "{value}"')
def step_plan_duration_value(context: Context, value: str) -> None:
    assert OperationalMetricKey.PLAN_DURATION_MS.value == value


@then('LLM_AVG_LATENCY_MS should equal "{value}"')
def step_llm_avg_latency_value(context: Context, value: str) -> None:
    assert OperationalMetricKey.LLM_AVG_LATENCY_MS.value == value


@then('SUBPLAN_COUNT should equal "{value}"')
def step_subplan_count_value(context: Context, value: str) -> None:
    assert OperationalMetricKey.SUBPLAN_COUNT.value == value


# ---------------------------------------------------------------------------
# Metric entry
# ---------------------------------------------------------------------------


@given("a plan_id for metrics")
def step_plan_id_for_metrics(context: Context) -> None:
    context.metric_plan_id = VALID_PLAN_ID


@when("I record a PLAN_DURATION_MS metric with value {value:g}")
def step_record_metric(context: Context, value: float) -> None:
    context.metric_entry = MetricCollector.record(
        OperationalMetricKey.PLAN_DURATION_MS,
        value,
        context.metric_plan_id,
    )


@when("I record an ACTOR_LATENCY_MS metric with actor label")
def step_record_metric_with_label(context: Context) -> None:
    context.metric_entry = MetricCollector.record(
        OperationalMetricKey.ACTOR_LATENCY_MS,
        150.0,
        context.metric_plan_id,
        labels={"actor": "planner"},
    )


@then("the metric entry key should be PLAN_DURATION_MS")
def step_metric_key_plan_duration(context: Context) -> None:
    assert context.metric_entry.key == OperationalMetricKey.PLAN_DURATION_MS


@then("the metric entry value should be {value:g}")
def step_metric_value(context: Context, value: float) -> None:
    assert context.metric_entry.value == value


@then("the metric entry should have a timestamp")
def step_metric_timestamp(context: Context) -> None:
    assert isinstance(context.metric_entry.timestamp, datetime)


@then("the metric entry labels should contain actor")
def step_metric_labels(context: Context) -> None:
    assert "actor" in context.metric_entry.labels


# ---------------------------------------------------------------------------
# Trace recording
# ---------------------------------------------------------------------------


@given("a valid LLM trace")
def step_valid_trace(context: Context) -> None:
    context.trace = _make_trace()


@given("three valid LLM traces for the same plan")
def step_three_traces(context: Context) -> None:
    context.traces_list = [
        _make_trace(
            trace_id=VALID_ULID_1, prompt_tokens=500, cost_usd=0.01, latency_ms=300.0
        ),
        _make_trace(
            trace_id=VALID_ULID_2, prompt_tokens=300, cost_usd=0.005, latency_ms=200.0
        ),
        _make_trace(
            trace_id=VALID_ULID_3, prompt_tokens=700, cost_usd=0.02, latency_ms=500.0
        ),
    ]


@given("two traces with the same decision_id")
def step_two_traces_same_decision(context: Context) -> None:
    context.traces_list = [
        _make_trace(trace_id=VALID_ULID_1, decision_id=VALID_DECISION_ID),
        _make_trace(trace_id=VALID_ULID_2, decision_id=VALID_DECISION_ID),
    ]


@when("I record the trace via the service")
def step_record_trace(context: Context) -> None:
    def mock_internal_forward(trace: LLMTrace) -> None:
        context.langsmith_called = True
        if getattr(context, "langsmith_will_fail", False):
            raise RuntimeError("LangSmith connection failed")

    try:
        with patch(
            "cleveragents.application.services.trace_service._forward_trace_to_langsmith",
            side_effect=mock_internal_forward,
        ):
            context.service.record_trace(context.trace)
    except Exception as exc:
        context.error = exc


@when("I record all traces via the service")
def step_record_all_traces(context: Context) -> None:
    for t in context.traces_list:
        context.service.record_trace(t)


@then("I should be able to retrieve it by trace_id")
def step_retrieve_by_id(context: Context) -> None:
    result = context.service.get_trace(context.trace.trace_id)
    assert result is not None
    assert result.trace_id == context.trace.trace_id


@then("I should be able to list it by plan_id")
def step_list_by_plan(context: Context) -> None:
    results = context.service.get_traces(context.trace.plan_id)
    assert len(results) >= 1
    assert any(t.trace_id == context.trace.trace_id for t in results)


@then("listing by plan_id should return {count:d} traces")
def step_list_count(context: Context, count: int) -> None:
    plan_id = context.traces_list[0].plan_id
    results = context.service.get_traces(plan_id)
    assert len(results) == count


@then("listing by decision_id should return {count:d} traces")
def step_list_by_decision_count(context: Context, count: int) -> None:
    decision_id = context.traces_list[0].decision_id
    assert decision_id is not None
    results = context.service.get_traces_by_decision(decision_id)
    assert len(results) == count


@when("I query a non-existent trace_id")
def step_query_missing(context: Context) -> None:
    context.result = context.service.get_trace("01HXZZZZZZZZZZZZZZZZZZZZZZ")


@then("the trace query result should be None")
def step_result_none(context: Context) -> None:
    assert context.result is None


# ---------------------------------------------------------------------------
# Metric computation
# ---------------------------------------------------------------------------


@when("I compute metrics for the plan")
def step_compute_metrics(context: Context) -> None:
    plan_id = context.traces_list[0].plan_id
    context.metrics_list = context.service.compute_metrics(plan_id)


@when("I compute metrics for a plan with no traces")
def step_compute_empty(context: Context) -> None:
    context.metrics_list = context.service.compute_metrics("01HXEEEEEEEEEEEEEEEEEEEEEE")


@then("I should get LLM_CALL_COUNT equal to {count:d}")
def step_llm_call_count(context: Context, count: int) -> None:
    entry = _find_metric(context.metrics_list, OperationalMetricKey.LLM_CALL_COUNT)
    assert entry is not None
    assert entry.value == float(count)


@then("I should get LLM_TOTAL_TOKENS greater than {value:d}")
def step_llm_total_tokens(context: Context, value: int) -> None:
    entry = _find_metric(context.metrics_list, OperationalMetricKey.LLM_TOTAL_TOKENS)
    assert entry is not None
    assert entry.value > value


@then("I should get LLM_TOTAL_COST_USD greater than {value:d}")
def step_llm_total_cost(context: Context, value: int) -> None:
    entry = _find_metric(context.metrics_list, OperationalMetricKey.LLM_TOTAL_COST_USD)
    assert entry is not None
    assert entry.value > value


@then("I should get LLM_AVG_LATENCY_MS greater than {value:d}")
def step_llm_avg_latency(context: Context, value: int) -> None:
    entry = _find_metric(context.metrics_list, OperationalMetricKey.LLM_AVG_LATENCY_MS)
    assert entry is not None
    assert entry.value > value


@then("the metrics list should be empty")
def step_metrics_empty(context: Context) -> None:
    assert len(context.metrics_list) == 0


def _find_metric(
    metrics: list[MetricEntry], key: OperationalMetricKey
) -> MetricEntry | None:
    for m in metrics:
        if m.key == key:
            return m
    return None


# ---------------------------------------------------------------------------
# Lifecycle hooks
# ---------------------------------------------------------------------------


@when("I call on_plan_start")
def step_on_plan_start(context: Context) -> None:
    context.metric_entry = context.service.on_plan_start(context.metric_plan_id)


@then("I should get a PLAN_DECISION_COUNT metric with value {value:d}")
def step_plan_decision_count(context: Context, value: int) -> None:
    assert context.metric_entry is not None
    assert context.metric_entry.key == OperationalMetricKey.PLAN_DECISION_COUNT
    assert context.metric_entry.value == float(value)


@when('I call on_actor_invocation with actor "{actor}" and latency {latency:g}')
def step_on_actor_invocation(context: Context, actor: str, latency: float) -> None:
    context.hook_metrics = context.service.on_actor_invocation(
        context.metric_plan_id, actor, latency
    )


@then("I should get ACTOR_INVOCATION_COUNT and ACTOR_LATENCY_MS metrics")
def step_actor_metrics(context: Context) -> None:
    keys = {m.key for m in context.hook_metrics}
    assert OperationalMetricKey.ACTOR_INVOCATION_COUNT in keys
    assert OperationalMetricKey.ACTOR_LATENCY_MS in keys


@when('I call on_tool_execution with tool "{tool}" and no error')
def step_on_tool_no_error(context: Context, tool: str) -> None:
    context.hook_metrics = context.service.on_tool_execution(
        context.metric_plan_id, tool, errored=False
    )


@when('I call on_tool_execution with tool "{tool}" and error')
def step_on_tool_error(context: Context, tool: str) -> None:
    context.hook_metrics = context.service.on_tool_execution(
        context.metric_plan_id, tool, errored=True
    )


@then("I should get a TOOL_INVOCATION_COUNT metric")
def step_tool_invocation(context: Context) -> None:
    keys = {m.key for m in context.hook_metrics}
    assert OperationalMetricKey.TOOL_INVOCATION_COUNT in keys


@then("I should not get a TOOL_ERROR_RATE metric")
def step_no_tool_error_rate(context: Context) -> None:
    keys = {m.key for m in context.hook_metrics}
    assert OperationalMetricKey.TOOL_ERROR_RATE not in keys


@then("I should get both TOOL_INVOCATION_COUNT and TOOL_ERROR_RATE metrics")
def step_tool_both_metrics(context: Context) -> None:
    keys = {m.key for m in context.hook_metrics}
    assert OperationalMetricKey.TOOL_INVOCATION_COUNT in keys
    assert OperationalMetricKey.TOOL_ERROR_RATE in keys


# ---------------------------------------------------------------------------
# LangSmith forwarding
# ---------------------------------------------------------------------------


@given('LANGCHAIN_TRACING_V2 is set to "{value}"')
def step_langsmith_enabled(context: Context, value: str) -> None:
    os.environ["LANGCHAIN_TRACING_V2"] = value


@given("LANGCHAIN_TRACING_V2 is not set")
def step_langsmith_disabled(context: Context) -> None:
    os.environ.pop("LANGCHAIN_TRACING_V2", None)


@given("the LangSmith forwarder will raise an exception")
def step_langsmith_error(context: Context) -> None:
    context.langsmith_will_fail = True


@then("the LangSmith forwarder should have been called")
def step_langsmith_called(context: Context) -> None:
    assert context.langsmith_called is True


@then("the LangSmith forwarder should not have been called")
def step_langsmith_not_called(context: Context) -> None:
    assert context.langsmith_called is False


@then("no exception should propagate")
def step_no_exception(context: Context) -> None:
    assert context.error is None


@then("the trace should still be persisted")
def step_trace_persisted(context: Context) -> None:
    result = context.service.get_trace(context.trace.trace_id)
    assert result is not None


# ---------------------------------------------------------------------------
# Convenience collectors
# ---------------------------------------------------------------------------


@when("I call MetricCollector.plan_duration with {value:g}")
def step_collector_plan_duration(context: Context, value: float) -> None:
    context.metric_entry = MetricCollector.plan_duration(context.metric_plan_id, value)


@when("I call MetricCollector.plan_cost with {value:g}")
def step_collector_plan_cost(context: Context, value: float) -> None:
    context.metric_entry = MetricCollector.plan_cost(context.metric_plan_id, value)


@when("I call MetricCollector.llm_call_count with {value:d}")
def step_collector_llm_call_count(context: Context, value: int) -> None:
    context.metric_entry = MetricCollector.llm_call_count(
        context.metric_plan_id, float(value)
    )


@then("the metric key should be PLAN_DURATION_MS")
def step_key_plan_duration(context: Context) -> None:
    assert context.metric_entry.key == OperationalMetricKey.PLAN_DURATION_MS


@then("the metric key should be PLAN_TOTAL_COST_USD")
def step_key_plan_cost(context: Context) -> None:
    assert context.metric_entry.key == OperationalMetricKey.PLAN_TOTAL_COST_USD


@then("the metric key should be LLM_CALL_COUNT")
def step_key_llm_call(context: Context) -> None:
    assert context.metric_entry.key == OperationalMetricKey.LLM_CALL_COUNT


@then("the metric value should be {value:g}")
def step_metric_exact_value(context: Context, value: float) -> None:
    assert context.metric_entry.value == value


# ---------------------------------------------------------------------------
# Database model
# ---------------------------------------------------------------------------


@then('the LLMTraceModel should have tablename "{name}"')
def step_table_name(context: Context, name: str) -> None:
    assert LLMTraceModel.__tablename__ == name


# ---------------------------------------------------------------------------
# Repository integration (SQLAlchemy in-memory)
# ---------------------------------------------------------------------------


def _create_in_memory_engine_and_session():
    """Create an in-memory SQLite engine and session factory for testing."""
    engine = create_engine("sqlite:///:memory:")
    Base.metadata.create_all(engine)
    factory = sessionmaker(bind=engine)
    return engine, factory


@when("I create a repository with None session_factory")
def step_repo_none_factory(context: Context) -> None:
    try:
        LLMTraceRepository(session_factory=None)  # type: ignore[arg-type]
    except ValueError as exc:
        context.error = exc


@then("a ValueError should be raised for the repository")
def step_repo_valueerror_raised(context: Context) -> None:
    assert context.error is not None, "Expected a ValueError"
    assert isinstance(context.error, ValueError)


@given("a SQLAlchemy in-memory repository")
def step_sqla_repo(context: Context) -> None:
    engine, factory = _create_in_memory_engine_and_session()
    context.sqla_engine = engine
    context.sqla_factory = factory
    # Use a single session for all repository operations so that
    # flush() (without commit) keeps data visible across calls.
    shared_session = factory()
    context.sqla_shared_session = shared_session
    context.sqla_repo = LLMTraceRepository(session_factory=lambda: shared_session)


@given("a valid LLM trace with tool calls")
def step_trace_with_tool_calls(context: Context) -> None:
    context.trace = _make_trace(
        tool_calls=[{"name": "search", "arguments": {"q": "test"}}],
    )


@when("I save the trace via the repository")
def step_save_via_repo(context: Context) -> None:
    context.sqla_repo.save(context.trace)


@then("I should be able to get it by trace_id from the repository")
def step_get_from_repo(context: Context) -> None:
    result = context.sqla_repo.get(context.trace.trace_id)
    assert result is not None
    assert result.trace_id == context.trace.trace_id
    assert result.plan_id == context.trace.plan_id
    assert result.actor == context.trace.actor
    assert result.provider == context.trace.provider
    assert result.model == context.trace.model
    assert result.prompt_tokens == context.trace.prompt_tokens
    assert result.completion_tokens == context.trace.completion_tokens
    context.repo_result = result


@then("the retrieved trace should have tool calls")
def step_retrieved_has_tool_calls(context: Context) -> None:
    result = context.sqla_repo.get(context.trace.trace_id)
    assert result is not None
    assert len(result.tool_calls) > 0
    assert result.tool_calls[0]["name"] == "search"


@when("I get a non-existent trace from the repository")
def step_get_nonexistent_from_repo(context: Context) -> None:
    context.repo_result = context.sqla_repo.get("01HXZZZZZZZZZZZZZZZZZZZZZZ")


@then("the repository result should be None")
def step_repo_result_none(context: Context) -> None:
    assert context.repo_result is None


@given("two traces for the same plan in the repository")
def step_two_traces_same_plan_repo(context: Context) -> None:
    context.repo_traces = [
        _make_trace(trace_id=VALID_ULID_1, plan_id=VALID_PLAN_ID),
        _make_trace(trace_id=VALID_ULID_2, plan_id=VALID_PLAN_ID),
    ]


@when("I save both traces via the repository")
def step_save_both_repo(context: Context) -> None:
    for t in context.repo_traces:
        context.sqla_repo.save(t)


@then("listing by plan from the repository should return {count:d} traces")
def step_list_by_plan_repo(context: Context, count: int) -> None:
    results = context.sqla_repo.list_by_plan(VALID_PLAN_ID)
    assert len(results) == count


@when("I list traces for a non-existent plan from the repository")
def step_list_nonexistent_plan_repo(context: Context) -> None:
    context.repo_list_result = context.sqla_repo.list_by_plan(
        "01HXZZZZZZZZZZZZZZZZZZZZZZ"
    )


@then("the repository list should be empty")
def step_repo_list_empty(context: Context) -> None:
    assert len(context.repo_list_result) == 0


@given("two traces for the same decision in the repository")
def step_two_traces_same_decision_repo(context: Context) -> None:
    context.repo_traces = [
        _make_trace(
            trace_id=VALID_ULID_1,
            plan_id=VALID_PLAN_ID,
            decision_id=VALID_DECISION_ID,
        ),
        _make_trace(
            trace_id=VALID_ULID_2,
            plan_id=VALID_PLAN_ID,
            decision_id=VALID_DECISION_ID,
        ),
    ]


@then("listing by decision from the repository should return {count:d} traces")
def step_list_by_decision_repo(context: Context, count: int) -> None:
    results = context.sqla_repo.list_by_decision(VALID_DECISION_ID)
    assert len(results) == count


@when("I list traces for a non-existent decision from the repository")
def step_list_nonexistent_decision_repo(context: Context) -> None:
    context.repo_list_result = context.sqla_repo.list_by_decision(
        "01HXZZZZZZZZZZZZZZZZZZZZZZ"
    )


# --- Repository error paths -----------------------------------------------


class _BrokenSession:
    """A mock session that raises SQLAlchemyDatabaseError on all ops."""

    def add(self, _obj: Any) -> None:
        raise SQLAlchemyDatabaseError("mock", {}, Exception("broken"))

    def commit(self) -> None:
        raise SQLAlchemyDatabaseError("mock", {}, Exception("broken"))

    def rollback(self) -> None:
        pass

    def close(self) -> None:
        pass

    def query(self, *_args: Any, **_kwargs: Any) -> Any:
        raise SQLAlchemyDatabaseError("mock", {}, Exception("broken"))


@given("a SQLAlchemy repository with a broken session")
def step_broken_repo(context: Context) -> None:
    context.broken_repo = LLMTraceRepository(
        session_factory=lambda: _BrokenSession()  # type: ignore[return-value]
    )


@when("I save the trace via the broken repository")
def step_save_broken(context: Context) -> None:
    try:
        context.broken_repo.save(context.trace)
    except AppDatabaseError as exc:
        context.error = exc
    except Exception as exc:
        # tenacity may wrap in RetryError; unwrap to the root cause
        cause = getattr(exc, "__cause__", None) or exc
        context.error = cause


@when("I get a trace from the broken repository")
def step_get_broken(context: Context) -> None:
    try:
        context.broken_repo.get(VALID_ULID_1)
    except AppDatabaseError as exc:
        context.error = exc
    except Exception as exc:
        cause = getattr(exc, "__cause__", None) or exc
        context.error = cause


@when("I list by plan from the broken repository")
def step_list_plan_broken(context: Context) -> None:
    try:
        context.broken_repo.list_by_plan(VALID_PLAN_ID)
    except AppDatabaseError as exc:
        context.error = exc
    except Exception as exc:
        cause = getattr(exc, "__cause__", None) or exc
        context.error = cause


@when("I list by decision from the broken repository")
def step_list_decision_broken(context: Context) -> None:
    try:
        context.broken_repo.list_by_decision(VALID_DECISION_ID)
    except AppDatabaseError as exc:
        context.error = exc
    except Exception as exc:
        cause = getattr(exc, "__cause__", None) or exc
        context.error = cause


# ---------------------------------------------------------------------------
# LangSmith internal forwarder detail tests
# ---------------------------------------------------------------------------


@given("the langsmith SDK is mocked as available")
def step_langsmith_sdk_available(context: Context) -> None:
    context.mock_langsmith_client = MagicMock()
    context.mock_langsmith_module = MagicMock()
    context.mock_langsmith_module.Client.return_value = context.mock_langsmith_client


@given('a valid LLM trace with error "{error_msg}"')
def step_trace_with_error(context: Context, error_msg: str) -> None:
    context.trace = _make_trace(error=error_msg)


@when("I call the internal LangSmith forwarder")
def step_call_internal_forwarder(context: Context) -> None:
    if hasattr(context, "mock_langsmith_module"):
        # Mock the langsmith import inside _forward_trace_to_langsmith
        real_import = builtins.__import__

        def mock_import(name: str, *args: Any, **kwargs: Any) -> Any:
            if name == "langsmith":
                return context.mock_langsmith_module
            return real_import(name, *args, **kwargs)

        with patch.object(builtins, "__import__", side_effect=mock_import):
            _forward_trace_to_langsmith(context.trace)
    elif getattr(context, "langsmith_not_importable", False):
        # Block the langsmith import to simulate SDK not installed
        real_import = builtins.__import__

        def block_langsmith(name: str, *args: Any, **kwargs: Any) -> Any:
            if name == "langsmith":
                raise ImportError("No module named 'langsmith'")
            return real_import(name, *args, **kwargs)

        with patch.object(builtins, "__import__", side_effect=block_langsmith):
            _forward_trace_to_langsmith(context.trace)
    else:
        _forward_trace_to_langsmith(context.trace)


@then("the langsmith Client create_run should have been called")
def step_langsmith_create_run_called(context: Context) -> None:
    context.mock_langsmith_client.create_run.assert_called_once()


@then("the langsmith Client create_run should have been called with error")
def step_langsmith_create_run_with_error(context: Context) -> None:
    context.mock_langsmith_client.create_run.assert_called_once()
    call_kwargs = context.mock_langsmith_client.create_run.call_args
    # The call uses **run_data, so check kwargs
    all_args = call_kwargs.kwargs if call_kwargs.kwargs else {}
    assert "error" in all_args, f"Expected 'error' in call kwargs: {all_args}"


@given("the langsmith SDK is not importable")
def step_langsmith_not_importable(context: Context) -> None:
    context.langsmith_not_importable = True
    context.langsmith_client_created = False


@then("no langsmith Client should have been created")
def step_no_langsmith_client(context: Context) -> None:
    # Verified by the fact that no error was raised and the function
    # returned cleanly when the import was blocked.
    assert not getattr(context, "langsmith_client_created", False)


@then("the langsmith_enabled check should return True")
def step_langsmith_enabled_true(context: Context) -> None:
    assert TraceService._langsmith_enabled() is True


@then("the raw tool_calls_json in the database should be null")
def step_raw_tool_calls_null(context: Context) -> None:
    session = getattr(context, "sqla_shared_session", None) or context.sqla_factory()
    row = (
        session.query(LLMTraceModel).filter_by(trace_id=context.trace.trace_id).first()
    )
    assert row is not None
    assert row.tool_calls_json is None


# ---------------------------------------------------------------------------
# Session contract: flush not commit
# ---------------------------------------------------------------------------


@when("I save the trace via the repository and spy on the session")
def step_save_with_spy(context: Context) -> None:
    engine, factory = _create_in_memory_engine_and_session()
    context.sqla_engine = engine
    context.sqla_factory = factory

    # Create a real session but wrap it to spy on flush/commit calls
    real_session = factory()
    context.spy_session = real_session
    context.flush_called = False
    context.commit_called = False

    original_flush = real_session.flush
    original_commit = real_session.commit

    def spy_flush(*args: Any, **kwargs: Any) -> None:
        context.flush_called = True
        return original_flush(*args, **kwargs)

    def spy_commit(*args: Any, **kwargs: Any) -> None:
        context.commit_called = True
        return original_commit(*args, **kwargs)

    # Assign spy functions to session methods
    # Using object.__setattr__ to bypass type checking for method replacement
    object.__setattr__(real_session, "flush", spy_flush)
    object.__setattr__(real_session, "commit", spy_commit)

    # Pass the session explicitly to test the UoW path: save() must flush
    # but must NOT commit (the caller owns the transaction boundary).
    repo = LLMTraceRepository(session_factory=lambda: real_session)
    repo.save(context.trace, session=real_session)
    # Commit so the data is visible for subsequent queries
    object.__setattr__(real_session, "commit", original_commit)
    real_session.commit()


@then("the session flush should have been called")
def step_flush_called(context: Context) -> None:
    assert context.flush_called is True, "Expected session.flush() to have been called"


@then("the session commit should not have been called")
def step_commit_not_called(context: Context) -> None:
    assert context.commit_called is False, (
        "Expected session.commit() NOT to have been called by save(), but it was called"
    )


# ---------------------------------------------------------------------------
# UnitOfWork rollback propagation
# ---------------------------------------------------------------------------


@given("a UnitOfWork with an in-memory database")
def step_uow_in_memory(context: Context) -> None:
    engine = create_engine(
        "sqlite:///:memory:",
        connect_args={"check_same_thread": False},
    )
    Base.metadata.create_all(engine)
    context.uow_engine = engine
    context.uow_session_factory = sessionmaker(
        bind=engine,
        expire_on_commit=False,
        autoflush=False,
        autocommit=False,
    )


@when("I save the trace inside a UnitOfWork transaction that rolls back")
def step_save_in_uow_rollback(context: Context) -> None:
    session = context.uow_session_factory()
    repo = LLMTraceRepository(session_factory=lambda: session)
    try:
        # Pass the session explicitly to use UoW mode: save() flushes but
        # does NOT commit, so the caller's rollback can undo the change.
        repo.save(context.trace, session=session)
        # Simulate a subsequent failure that triggers rollback
        raise RuntimeError("Simulated failure after save")
    except RuntimeError:
        session.rollback()
    finally:
        session.close()


@then("the LLM trace should not be persisted in the database")
def step_trace_not_persisted(context: Context) -> None:
    session = context.uow_session_factory()
    try:
        row = (
            session.query(LLMTraceModel)
            .filter_by(trace_id=context.trace.trace_id)
            .first()
        )
        assert row is None, (
            f"Expected LLM trace {context.trace.trace_id} to be rolled back, "
            f"but it was found in the database"
        )
    finally:
        session.close()