import json
import sys
from contextlib import contextmanager, nullcontext
from types import ModuleType
from unittest.mock import MagicMock, patch

import pytest
from celery.exceptions import Retry
from flask import Flask

from configs import dify_config
from core.ops.base_trace_instance import (
    ApplicationTracingHooksNotRegisteredError,
    bind_application_tracing_hooks,
)
from core.ops.entities.config_entity import OPS_TRACE_FAILED_KEY
from core.ops.entities.trace_entity import BaseTraceInfo
from core.ops.exceptions import PendingTraceParentContextError, RetryableTraceDispatchError
from services.tracing.provider_dispatch import TraceExportUncertainError
from services.tracing.runtime_bridge import RuntimeApplicationTracingHooks
from tasks.ops_trace_task import process_trace_tasks
from tests.helpers.unit.config_override import apply_config_overrides


@pytest.fixture(autouse=True)
def _application_tracing_disabled(monkeypatch: pytest.MonkeyPatch) -> None:
    apply_config_overrides(monkeypatch, OPS_AGENT_TRACE_ENABLED=False)


@contextmanager
def fake_app_context():
    yield


class FakeCurrentApp:
    def app_context(self):
        return fake_app_context()


def _install_trace_manager(
    trace_instance: MagicMock,
    *,
    enterprise_enabled: bool = False,
    enterprise_trace_cls: MagicMock | None = None,
) -> dict[str, ModuleType]:
    ops_trace_manager_module = ModuleType("core.ops.ops_trace_manager")

    class StubOpsTraceManager:
        @staticmethod
        def get_ops_trace_instance(app_id: str) -> MagicMock:
            return trace_instance

    telemetry_module = ModuleType("extensions.ext_enterprise_telemetry")
    telemetry_module.is_enabled = lambda: enterprise_enabled

    ops_trace_manager_module.OpsTraceManager = StubOpsTraceManager
    modules = {
        "core.ops.ops_trace_manager": ops_trace_manager_module,
        "extensions.ext_enterprise_telemetry": telemetry_module,
    }
    if enterprise_trace_cls is not None:
        enterprise_module = ModuleType("enterprise")
        enterprise_telemetry_module = ModuleType("enterprise.telemetry")
        enterprise_trace_module = ModuleType("enterprise.telemetry.enterprise_trace")
        enterprise_trace_module.EnterpriseOtelTrace = enterprise_trace_cls
        modules.update(
            {
                "enterprise": enterprise_module,
                "enterprise.telemetry": enterprise_telemetry_module,
                "enterprise.telemetry.enterprise_trace": enterprise_trace_module,
            }
        )
    return modules


def _make_payload() -> str:
    return json.dumps({"trace_info": {}, "trace_info_type": None})


def _decode_saved_payload(payload: bytes | str) -> dict[str, object]:
    if isinstance(payload, bytes):
        payload = payload.decode("utf-8")
    return json.loads(payload)


def _retryable_dispatch_error() -> RetryableTraceDispatchError:
    return RetryableTraceDispatchError("transient trace dispatch failure")


def _run_task(file_info: dict[str, str], retries: int = 0) -> None:
    process_trace_tasks.push_request(retries=retries)
    try:
        process_trace_tasks.run(file_info)
    finally:
        process_trace_tasks.pop_request()


@pytest.mark.parametrize(
    "pending_error",
    [
        _retryable_dispatch_error(),
        PendingTraceParentContextError("parent-node"),
        TraceExportUncertainError("DO_NOT_EXPOSE_PROVIDER_BODY"),
    ],
)
def test_process_trace_tasks_retries_only_confirmed_retryable_dispatch_failures(
    pending_error: RetryableTraceDispatchError,
    caplog: pytest.LogCaptureFixture,
) -> None:
    file_info = {"app_id": "app-id", "file_id": "file-id"}
    trace_instance = MagicMock()
    trace_instance.trace.side_effect = pending_error
    retry_error = Retry()

    with (
        patch.dict(sys.modules, _install_trace_manager(trace_instance)),
        patch("tasks.ops_trace_task.current_app", FakeCurrentApp()),
        patch("tasks.ops_trace_task.storage.load", return_value=_make_payload()),
        patch("tasks.ops_trace_task.storage.delete") as mock_delete,
        patch("tasks.ops_trace_task.redis_client.incr") as mock_incr,
        patch.object(process_trace_tasks, "retry", side_effect=retry_error) as mock_retry,
        pytest.raises(Retry) if not pending_error.acceptance_unknown else nullcontext(),
    ):
        _run_task(file_info)

    trace_instance.trace.assert_called_once_with({})
    if pending_error.acceptance_unknown:
        mock_retry.assert_not_called()
        mock_delete.assert_called_once_with("ops_trace/app-id/file-id.json")
        mock_incr.assert_called_once_with(f"{OPS_TRACE_FAILED_KEY}_app-id")
        assert "DO_NOT_EXPOSE_PROVIDER_BODY" not in caplog.text
    else:
        mock_retry.assert_called_once_with(
            exc=pending_error,
            countdown=process_trace_tasks.default_retry_delay,
        )
        mock_delete.assert_not_called()
        mock_incr.assert_not_called()


def test_process_trace_tasks_marks_enterprise_trace_dispatched_before_retryable_dispatch_retry():
    file_info = {"app_id": "app-id", "file_id": "file-id"}
    trace_instance = MagicMock()
    pending_error = _retryable_dispatch_error()
    trace_instance.trace.side_effect = pending_error
    retry_error = Retry()
    enterprise_tracer = MagicMock()
    enterprise_trace_cls = MagicMock(return_value=enterprise_tracer)

    with (
        patch.dict(
            sys.modules,
            _install_trace_manager(
                trace_instance,
                enterprise_enabled=True,
                enterprise_trace_cls=enterprise_trace_cls,
            ),
        ),
        patch("tasks.ops_trace_task.current_app", FakeCurrentApp()),
        patch("tasks.ops_trace_task.storage.load", return_value=_make_payload()),
        patch("tasks.ops_trace_task.storage.save") as mock_save,
        patch("tasks.ops_trace_task.storage.delete") as mock_delete,
        patch("tasks.ops_trace_task.redis_client.incr") as mock_incr,
        patch.object(process_trace_tasks, "retry", side_effect=retry_error) as mock_retry,
        pytest.raises(Retry),
    ):
        _run_task(file_info)

    enterprise_tracer.trace.assert_called_once_with({})
    saved_path, saved_payload = mock_save.call_args.args
    assert saved_path == "ops_trace/app-id/file-id.json"
    assert _decode_saved_payload(saved_payload)["_enterprise_trace_dispatched"] is True
    mock_retry.assert_called_once_with(
        exc=pending_error,
        countdown=process_trace_tasks.default_retry_delay,
    )
    mock_delete.assert_not_called()
    mock_incr.assert_not_called()


def test_process_trace_tasks_does_not_mark_failed_enterprise_trace_as_dispatched_before_retry():
    file_info = {"app_id": "app-id", "file_id": "file-id"}
    trace_instance = MagicMock()
    pending_error = _retryable_dispatch_error()
    trace_instance.trace.side_effect = pending_error
    retry_error = Retry()
    enterprise_tracer = MagicMock()
    enterprise_tracer.trace.side_effect = RuntimeError("enterprise trace failed")
    enterprise_trace_cls = MagicMock(return_value=enterprise_tracer)

    with (
        patch.dict(
            sys.modules,
            _install_trace_manager(
                trace_instance,
                enterprise_enabled=True,
                enterprise_trace_cls=enterprise_trace_cls,
            ),
        ),
        patch("tasks.ops_trace_task.current_app", FakeCurrentApp()),
        patch("tasks.ops_trace_task.storage.load", return_value=_make_payload()),
        patch("tasks.ops_trace_task.storage.save") as mock_save,
        patch("tasks.ops_trace_task.storage.delete") as mock_delete,
        patch("tasks.ops_trace_task.redis_client.incr") as mock_incr,
        patch.object(process_trace_tasks, "retry", side_effect=retry_error) as mock_retry,
        pytest.raises(Retry),
    ):
        _run_task(file_info)

    enterprise_tracer.trace.assert_called_once_with({})
    mock_save.assert_not_called()
    mock_retry.assert_called_once_with(
        exc=pending_error,
        countdown=process_trace_tasks.default_retry_delay,
    )
    mock_delete.assert_not_called()
    mock_incr.assert_not_called()


def test_process_trace_tasks_skips_enterprise_trace_when_retry_payload_was_already_dispatched():
    file_info = {"app_id": "app-id", "file_id": "file-id"}
    trace_instance = MagicMock()
    enterprise_trace_cls = MagicMock()
    payload = json.dumps({"trace_info": {}, "trace_info_type": None, "_enterprise_trace_dispatched": True})

    with (
        patch.dict(
            sys.modules,
            _install_trace_manager(
                trace_instance,
                enterprise_enabled=True,
                enterprise_trace_cls=enterprise_trace_cls,
            ),
        ),
        patch("tasks.ops_trace_task.current_app", FakeCurrentApp()),
        patch("tasks.ops_trace_task.storage.load", return_value=payload),
        patch("tasks.ops_trace_task.storage.save") as mock_save,
        patch("tasks.ops_trace_task.storage.delete") as mock_delete,
        patch("tasks.ops_trace_task.redis_client.incr") as mock_incr,
    ):
        _run_task(file_info)

    enterprise_trace_cls.assert_not_called()
    trace_instance.trace.assert_called_once_with({})
    mock_save.assert_not_called()
    mock_delete.assert_called_once_with("ops_trace/app-id/file-id.json")
    mock_incr.assert_not_called()


def test_process_trace_tasks_default_retry_window_covers_workflow_and_export_grace_period():
    assert (
        process_trace_tasks.max_retries * process_trace_tasks.default_retry_delay
        >= dify_config.WORKFLOW_MAX_EXECUTION_TIME + 300
    )


def test_process_trace_tasks_deletes_payload_on_success():
    file_info = {"app_id": "app-id", "file_id": "file-id"}
    trace_instance = MagicMock()

    with (
        patch.dict(sys.modules, _install_trace_manager(trace_instance)),
        patch("tasks.ops_trace_task.current_app", FakeCurrentApp()),
        patch("tasks.ops_trace_task.storage.load", return_value=_make_payload()),
        patch("tasks.ops_trace_task.storage.delete") as mock_delete,
        patch("tasks.ops_trace_task.redis_client.incr") as mock_incr,
    ):
        _run_task(file_info)

    trace_instance.trace.assert_called_once_with({})
    mock_delete.assert_called_once_with("ops_trace/app-id/file-id.json")
    mock_incr.assert_not_called()


def test_process_trace_tasks_deletes_payload_and_counts_terminal_failure():
    file_info = {"app_id": "app-id", "file_id": "file-id"}
    trace_instance = MagicMock()
    trace_instance.trace.side_effect = RuntimeError("trace failed")

    with (
        patch.dict(sys.modules, _install_trace_manager(trace_instance)),
        patch("tasks.ops_trace_task.current_app", FakeCurrentApp()),
        patch("tasks.ops_trace_task.storage.load", return_value=_make_payload()),
        patch("tasks.ops_trace_task.storage.delete") as mock_delete,
        patch("tasks.ops_trace_task.redis_client.incr") as mock_incr,
    ):
        _run_task(file_info)

    mock_delete.assert_called_once_with("ops_trace/app-id/file-id.json")
    mock_incr.assert_called_once_with(f"{OPS_TRACE_FAILED_KEY}_app-id")


def test_process_trace_tasks_treats_retry_enqueue_failure_as_terminal_failure():
    file_info = {"app_id": "app-id", "file_id": "file-id"}
    trace_instance = MagicMock()
    pending_error = _retryable_dispatch_error()
    retry_enqueue_error = RuntimeError("retry enqueue failed")
    trace_instance.trace.side_effect = pending_error

    with (
        patch.dict(sys.modules, _install_trace_manager(trace_instance)),
        patch("tasks.ops_trace_task.current_app", FakeCurrentApp()),
        patch("tasks.ops_trace_task.storage.load", return_value=_make_payload()),
        patch("tasks.ops_trace_task.storage.delete") as mock_delete,
        patch("tasks.ops_trace_task.redis_client.incr") as mock_incr,
        patch.object(process_trace_tasks, "retry", side_effect=retry_enqueue_error) as mock_retry,
    ):
        _run_task(file_info)

    mock_retry.assert_called_once_with(
        exc=pending_error,
        countdown=process_trace_tasks.default_retry_delay,
    )
    mock_delete.assert_called_once_with("ops_trace/app-id/file-id.json")
    mock_incr.assert_called_once_with(f"{OPS_TRACE_FAILED_KEY}_app-id")


def test_process_trace_tasks_deletes_payload_and_counts_exhausted_retryable_dispatch_failure():
    file_info = {"app_id": "app-id", "file_id": "file-id"}
    trace_instance = MagicMock()
    pending_error = _retryable_dispatch_error()
    trace_instance.trace.side_effect = pending_error

    with (
        patch.dict(sys.modules, _install_trace_manager(trace_instance)),
        patch("tasks.ops_trace_task.current_app", FakeCurrentApp()),
        patch("tasks.ops_trace_task.storage.load", return_value=_make_payload()),
        patch("tasks.ops_trace_task.storage.delete") as mock_delete,
        patch("tasks.ops_trace_task.redis_client.incr") as mock_incr,
        patch.object(process_trace_tasks, "retry") as mock_retry,
    ):
        _run_task(file_info, retries=process_trace_tasks.max_retries)

    mock_retry.assert_not_called()
    mock_delete.assert_called_once_with("ops_trace/app-id/file-id.json")
    mock_incr.assert_called_once_with(f"{OPS_TRACE_FAILED_KEY}_app-id")


def test_managed_application_capture_receives_restored_info_and_preserves_enterprise(monkeypatch: pytest.MonkeyPatch):
    from core.ops.entities.trace_entity import MessageTraceInfo

    apply_config_overrides(monkeypatch, OPS_AGENT_TRACE_ENABLED=True)
    calls: list[BaseTraceInfo] = []

    def capture(info: BaseTraceInfo) -> bool:
        calls.append(info)
        return True

    monkeypatch.setattr(RuntimeApplicationTracingHooks, "capture_terminal", staticmethod(capture))
    hooks = RuntimeApplicationTracingHooks()
    app = Flask(__name__)
    bind_application_tracing_hooks(app, hooks)
    enterprise_calls: list[BaseTraceInfo] = []

    class RecordingEnterpriseTrace:
        def trace(self, info: BaseTraceInfo) -> None:
            enterprise_calls.append(info)

    payload = json.dumps(
        {
            "trace_info_type": "MessageTraceInfo",
            "trace_info": {
                "metadata": {},
                "message_id": "message-id",
                "conversation_model": "agent",
                "conversation_mode": "agent",
                "message_tokens": 0,
                "answer_tokens": 0,
                "total_tokens": 0,
            },
        }
    )
    with (
        app.app_context(),
        patch("extensions.ext_enterprise_telemetry.is_enabled", return_value=True),
        patch("enterprise.telemetry.enterprise_trace.EnterpriseOtelTrace", new=RecordingEnterpriseTrace),
        patch(
            "core.ops.ops_trace_manager.OpsTraceManager.get_ops_trace_instance",
            side_effect=AssertionError("managed traces must not instantiate legacy providers"),
        ) as lookup,
        patch("tasks.ops_trace_task.storage.load", return_value=payload),
        patch("tasks.ops_trace_task.storage.delete") as deleted,
    ):
        _run_task({"app_id": "app-id", "file_id": "file-id"})
    assert len(calls) == 1
    restored = calls[0]
    assert isinstance(restored, MessageTraceInfo)
    assert restored.message_id == "message-id"
    assert enterprise_calls == [restored]
    lookup.assert_not_called()
    deleted.assert_called_once()


@pytest.mark.parametrize("enabled", [False, True])
def test_nonmanaged_task_uses_legacy_and_disabled_gate_never_calls_collector(
    monkeypatch: pytest.MonkeyPatch, enabled: bool
):
    apply_config_overrides(monkeypatch, OPS_AGENT_TRACE_ENABLED=enabled)
    legacy_calls: list[object] = []

    class RecordingLegacyTrace:
        def trace(self, info: object) -> None:
            legacy_calls.append(info)

    legacy = RecordingLegacyTrace()
    calls: list[BaseTraceInfo] = []

    def capture(info: BaseTraceInfo) -> bool:
        calls.append(info)
        return False

    monkeypatch.setattr(RuntimeApplicationTracingHooks, "capture_terminal", staticmethod(capture))
    hooks = RuntimeApplicationTracingHooks()
    app = Flask(__name__)
    bind_application_tracing_hooks(app, hooks)
    with (
        app.app_context(),
        patch("extensions.ext_enterprise_telemetry.is_enabled", return_value=False),
        patch("core.ops.ops_trace_manager.OpsTraceManager.get_ops_trace_instance", return_value=legacy) as lookup,
        patch("tasks.ops_trace_task.storage.load", return_value=_make_payload()),
        patch("tasks.ops_trace_task.storage.delete"),
    ):
        _run_task({"app_id": "app-id", "file_id": "file-id"})
    assert calls == ([{}] if enabled else [])
    assert legacy_calls == [{}]
    lookup.assert_called_once_with("app-id")


def test_capture_persistence_failure_preserves_payload_without_legacy_export(monkeypatch: pytest.MonkeyPatch):
    apply_config_overrides(monkeypatch, OPS_AGENT_TRACE_ENABLED=True)
    pending_error = RetryableTraceDispatchError("database busy")
    calls: list[BaseTraceInfo] = []

    def capture(info: BaseTraceInfo) -> bool:
        calls.append(info)
        raise pending_error

    monkeypatch.setattr(RuntimeApplicationTracingHooks, "capture_terminal", staticmethod(capture))
    hooks = RuntimeApplicationTracingHooks()
    app = Flask(__name__)
    bind_application_tracing_hooks(app, hooks)
    with (
        app.app_context(),
        patch(
            "core.ops.ops_trace_manager.OpsTraceManager.get_ops_trace_instance",
            side_effect=AssertionError("capture failures must not instantiate legacy providers"),
        ) as lookup,
        patch("tasks.ops_trace_task.storage.load", return_value=_make_payload()),
        patch("tasks.ops_trace_task.storage.delete") as deleted,
        patch.object(process_trace_tasks, "retry", side_effect=Retry()) as retry,
        pytest.raises(Retry),
    ):
        _run_task({"app_id": "app-id", "file_id": "file-id"})
    lookup.assert_not_called()
    deleted.assert_not_called()

    assert calls == [{}]
    retry.assert_called_once_with(exc=pending_error, countdown=process_trace_tasks.default_retry_delay)


def test_unregistered_application_hooks_preserve_payload_without_legacy_export(monkeypatch: pytest.MonkeyPatch) -> None:
    apply_config_overrides(monkeypatch, OPS_AGENT_TRACE_ENABLED=True)
    app = Flask(__name__)
    with (
        app.app_context(),
        patch(
            "core.ops.ops_trace_manager.OpsTraceManager.get_ops_trace_instance",
            side_effect=AssertionError("unregistered hooks must not instantiate legacy providers"),
        ) as lookup,
        patch("tasks.ops_trace_task.storage.load", return_value=_make_payload()),
        patch("tasks.ops_trace_task.storage.delete") as deleted,
        patch("tasks.ops_trace_task.redis_client.incr") as failed,
        patch.object(process_trace_tasks, "retry", side_effect=Retry()) as retry,
        pytest.raises(Retry),
    ):
        _run_task({"app_id": "app-id", "file_id": "file-id"})

    deleted.assert_not_called()
    failed.assert_not_called()
    retry.assert_called_once()
    lookup.assert_not_called()
    assert isinstance(retry.call_args.kwargs["exc"], ApplicationTracingHooksNotRegisteredError)
    assert retry.call_args.kwargs["countdown"] == process_trace_tasks.default_retry_delay


@pytest.mark.parametrize("marker", [True, "false", 0, None, {}])
def test_restricted_or_malformed_trace_policy_never_resolves_provider_but_keeps_enterprise(marker, mocker):
    class EnterpriseTraceBoundary:
        def trace(self, _data):
            raise AssertionError("trace transport must be patched")

    modules = _install_trace_manager(None, enterprise_enabled=True, enterprise_trace_cls=EnterpriseTraceBoundary)
    provider = mocker.patch.object(
        modules["core.ops.ops_trace_manager"].OpsTraceManager,
        "get_ops_trace_instance",
        side_effect=AssertionError("external provider resolution forbidden"),
    )
    enterprise_trace = mocker.patch.object(EnterpriseTraceBoundary, "trace")
    with (
        patch.dict(sys.modules, modules),
        patch(
            "tasks.ops_trace_task.storage.load",
            return_value=json.dumps(
                {
                    "trace_info": {},
                    "trace_info_type": None,
                    "external_tracing_disabled": marker,
                }
            ),
        ),
        patch("tasks.ops_trace_task.storage.delete") as delete,
    ):
        _run_task({"app_id": "app", "file_id": "trace"})
    provider.assert_not_called()
    enterprise_trace.assert_called_once_with({})
    delete.assert_called_once()