from __future__ import annotations

from collections.abc import Generator
from datetime import datetime
from pathlib import Path

from sqlalchemy.orm import Session

from tests.conftest import (
    build_fastapi_test_client,
    build_sqlite_database_url,
    prepare_known_service_import,
)


def test_runtime_debugger_pause_step_and_breakpoint_continue(tmp_path: Path) -> None:
    prepare_known_service_import("runtime-service")

    from app.api.routes import get_runtime_application_service
    from app.application.services import RuntimeApplicationService
    from app.bootstrap.app import create_app
    from app.bootstrap.settings import RuntimeServiceSettings
    from app.db.session import build_session_factory
    from app.domain.repositories import (
        ExecutionLogRepository,
        NodeArtifactRepository,
        NodeRunRepository,
        TraceSpanRepository,
        WorkflowRunRepository,
    )
    from app.infrastructure.executors import build_node_execution_dispatcher
    from core_db import Base
    from core_domain import WorkflowVersionContract

    class FakeWorkflowClient:
        def get_workflow_version(
            self,
            *,
            tenant_id: str,
            workflow_version_id: str,
        ) -> WorkflowVersionContract:
            assert tenant_id == "t1"
            assert workflow_version_id == "wv1"
            return WorkflowVersionContract(
                id="wv1",
                tenant_id="t1",
                workflow_id="wf1",
                version_no=1,
                status="published",
                created_time=datetime.utcnow(),
                dsl_json={
                    "code": "debug_flow",
                    "nodes": [
                        {"id": "start", "type": "template", "config": {"template": "hello"}},
                        {"id": "answer", "type": "answer", "config": {"text": "done"}},
                    ],
                    "edges": [{"source": "start", "target": "answer"}],
                },
            )

    settings = RuntimeServiceSettings(database_url=build_sqlite_database_url(tmp_path, "runtime.db"))
    session_factory = build_session_factory(settings)
    engine = session_factory.kw["bind"]
    Base.metadata.create_all(bind=engine)

    def override_service() -> Generator[RuntimeApplicationService, None, None]:
        db: Session = session_factory()
        try:
            yield RuntimeApplicationService(
                workflow_run_repository=WorkflowRunRepository(db),
                node_run_repository=NodeRunRepository(db),
                execution_log_repository=ExecutionLogRepository(db),
                node_artifact_repository=NodeArtifactRepository(db),
                trace_span_repository=TraceSpanRepository(db),
                execution_dispatcher=build_node_execution_dispatcher(),
                workflow_client=FakeWorkflowClient(),
            )
        finally:
            db.close()

    app = create_app()
    app.state.session_factory = session_factory
    app.dependency_overrides[get_runtime_application_service] = override_service
    client = build_fastapi_test_client(app)

    create_response = client.post(
        "/runtime/runs",
        json={
            "tenant_id": "t1",
            "app_id": "app1",
            "app_version_id": "av1",
            "workflow_id": "wf1",
            "workflow_version_id": "wv1",
        },
    )
    assert create_response.status_code == 200
    run_id = create_response.json()["run"]["id"]

    pause_response = client.post(
        f"/runtime/runs/{run_id}/debug/pause",
        params={"tenant_id": "t1"},
    )
    assert pause_response.status_code == 200
    assert pause_response.json()["run"]["status"] == "paused"
    assert pause_response.json()["queued_node_ids"] == ["start"]

    protected_execute_response = client.post(
        f"/runtime/runs/{run_id}/execute-next",
        params={"tenant_id": "t1"},
        json={"worker_key": "debugger"},
    )
    assert protected_execute_response.status_code == 200
    assert protected_execute_response.json()["executor_name"] == "debug_paused"
    assert protected_execute_response.json()["node_run"]["status"] == "queued"

    step_response = client.post(
        f"/runtime/runs/{run_id}/debug/step",
        params={"tenant_id": "t1"},
        json={"worker_key": "debugger"},
    )
    assert step_response.status_code == 200
    step_payload = step_response.json()
    assert step_payload["reason"] == "step_completed"
    assert [item["node_id"] for item in step_payload["executed_node_runs"]] == ["start"]
    assert step_payload["snapshot"]["run"]["status"] == "paused"
    assert step_payload["snapshot"]["completed_node_ids"] == ["start"]
    assert step_payload["snapshot"]["queued_node_ids"] == ["answer"]

    breakpoint_response = client.post(
        f"/runtime/runs/{run_id}/debug/continue",
        params={"tenant_id": "t1"},
        json={"worker_key": "debugger", "breakpoint_node_ids": ["answer"], "max_steps": 5},
    )
    assert breakpoint_response.status_code == 200
    breakpoint_payload = breakpoint_response.json()
    assert breakpoint_payload["reason"] == "breakpoint_hit"
    assert breakpoint_payload["paused_before_node_id"] == "answer"
    assert breakpoint_payload["executed_node_runs"] == []
    assert breakpoint_payload["snapshot"]["queued_node_ids"] == ["answer"]

    finish_response = client.post(
        f"/runtime/runs/{run_id}/debug/continue",
        params={"tenant_id": "t1"},
        json={"worker_key": "debugger", "max_steps": 5},
    )
    assert finish_response.status_code == 200
    finish_payload = finish_response.json()
    assert finish_payload["snapshot"]["run"]["status"] == "completed"
    assert finish_payload["snapshot"]["completed_node_ids"] == ["start", "answer"]
    assert finish_payload["snapshot"]["queued_node_ids"] == []

    engine.dispose()