from fastapi import APIRouter, Depends, HTTPException, Query
from sqlalchemy import text
from sqlalchemy.orm import Session

from core_domain import ServiceHealth
from app.application.services import RuntimeApplicationService
from app.bootstrap.settings import RuntimeServiceSettings
from app.db.session import get_db
from app.domain.repositories import (
    ExecutionLogRepository,
    NodeArtifactRepository,
    NodeRunRepository,
    TraceSpanRepository,
    WorkflowRunRepository,
)
from app.infrastructure.code_runner_client import CodeRunnerClient, CodeRunnerClientError
from app.infrastructure.executors import build_node_execution_dispatcher_with_clients
from app.infrastructure.model_gateway_client import ModelGatewayClient, ModelGatewayClientError
from app.infrastructure.tool_client import ToolServiceClient, ToolServiceClientError
from app.infrastructure.workflow_client import WorkflowServiceClient, WorkflowServiceClientError
from app.schemas.run import (
    ExecutionLogResponse,
    NodeArtifactResponse,
    NodeRunExecuteRequest,
    NodeRunExecuteResponse,
    NodeRunResponse,
    NodeRunStatusUpdateRequest,
    RunBootstrapResponse,
    RunCreateRequest,
    RunExecuteRequest,
    RunExecuteResponse,
    TraceSpanResponse,
    WorkflowRunResponse,
    WorkflowRunStatusUpdateRequest,
)

router = APIRouter()


def get_runtime_settings() -> RuntimeServiceSettings:
    return RuntimeServiceSettings()


def get_runtime_application_service(
    db: Session = Depends(get_db),
    settings: RuntimeServiceSettings = Depends(get_runtime_settings),
) -> RuntimeApplicationService:
    return 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_with_clients(
            code_runner_client=CodeRunnerClient(base_url=settings.code_runner_service_url),
            model_gateway_client=ModelGatewayClient(base_url=settings.model_gateway_service_url),
            tool_client=ToolServiceClient(base_url=settings.tool_service_url),
        ),
        workflow_client=WorkflowServiceClient(base_url=settings.workflow_service_url),
    )


@router.get("/health", response_model=ServiceHealth)
def health_check(db: Session = Depends(get_db)) -> ServiceHealth:
    db.execute(text("SELECT 1"))
    return ServiceHealth(service="runtime-service", status="ok", database="ok")


@router.post("/runs", response_model=RunBootstrapResponse)
def create_run(
    payload: RunCreateRequest,
    service: RuntimeApplicationService = Depends(get_runtime_application_service),
) -> RunBootstrapResponse:
    try:
        workflow_run, initial_node = service.create_run(payload)
    except (
        CodeRunnerClientError,
        ModelGatewayClientError,
        ToolServiceClientError,
        WorkflowServiceClientError,
    ) as exc:
        raise HTTPException(status_code=502, detail=str(exc)) from exc
    return RunBootstrapResponse(
        run=WorkflowRunResponse.from_entity(workflow_run),
        initial_node=NodeRunResponse.from_entity(initial_node) if initial_node else None,
    )


@router.get("/runs", response_model=list[WorkflowRunResponse])
def list_runs(
    tenant_id: str = Query(...),
    session_id: str | None = Query(default=None),
    service: RuntimeApplicationService = Depends(get_runtime_application_service),
) -> list[WorkflowRunResponse]:
    return [
        WorkflowRunResponse.from_entity(item)
        for item in service.list_runs(tenant_id=tenant_id, session_id=session_id)
    ]


@router.get("/node-runs", response_model=list[NodeRunResponse])
def list_node_runs(
    tenant_id: str = Query(...),
    run_id: str = Query(...),
    service: RuntimeApplicationService = Depends(get_runtime_application_service),
) -> list[NodeRunResponse]:
    return [
        NodeRunResponse.from_entity(item)
        for item in service.list_node_runs(tenant_id=tenant_id, run_id=run_id)
    ]


@router.get("/execution-logs", response_model=list[ExecutionLogResponse])
def list_execution_logs(
    tenant_id: str = Query(...),
    run_id: str | None = Query(default=None),
    node_run_id: str | None = Query(default=None),
    service: RuntimeApplicationService = Depends(get_runtime_application_service),
) -> list[ExecutionLogResponse]:
    return [
        ExecutionLogResponse.from_entity(item)
        for item in service.list_execution_logs(
            tenant_id=tenant_id,
            run_id=run_id,
            node_run_id=node_run_id,
        )
    ]


@router.get("/node-artifacts", response_model=list[NodeArtifactResponse])
def list_node_artifacts(
    tenant_id: str = Query(...),
    run_id: str | None = Query(default=None),
    node_run_id: str | None = Query(default=None),
    artifact_type: str | None = Query(default=None),
    service: RuntimeApplicationService = Depends(get_runtime_application_service),
) -> list[NodeArtifactResponse]:
    return [
        NodeArtifactResponse.from_entity(item)
        for item in service.list_node_artifacts(
            tenant_id=tenant_id,
            run_id=run_id,
            node_run_id=node_run_id,
            artifact_type=artifact_type,
        )
    ]


@router.get("/trace-spans", response_model=list[TraceSpanResponse])
def list_trace_spans(
    tenant_id: str = Query(...),
    run_id: str | None = Query(default=None),
    node_run_id: str | None = Query(default=None),
    span_type: str | None = Query(default=None),
    service: RuntimeApplicationService = Depends(get_runtime_application_service),
) -> list[TraceSpanResponse]:
    return [
        TraceSpanResponse.from_entity(item)
        for item in service.list_trace_spans(
            tenant_id=tenant_id,
            run_id=run_id,
            node_run_id=node_run_id,
            span_type=span_type,
        )
    ]


@router.post("/runs/{run_id}/status", response_model=WorkflowRunResponse)
def update_run_status(
    run_id: str,
    payload: WorkflowRunStatusUpdateRequest,
    service: RuntimeApplicationService = Depends(get_runtime_application_service),
) -> WorkflowRunResponse:
    entity = service.update_run_status(run_id=run_id, payload=payload)
    if entity is None:
        raise HTTPException(status_code=404, detail=f"workflow_run not found: {run_id}")
    return WorkflowRunResponse.from_entity(entity)


@router.post("/node-runs/{node_run_id}/status", response_model=NodeRunResponse)
def update_node_run_status(
    node_run_id: str,
    payload: NodeRunStatusUpdateRequest,
    service: RuntimeApplicationService = Depends(get_runtime_application_service),
) -> NodeRunResponse:
    entity = service.update_node_run_status(node_run_id=node_run_id, payload=payload)
    if entity is None:
        raise HTTPException(status_code=404, detail=f"node_run not found: {node_run_id}")
    return NodeRunResponse.from_entity(entity)


@router.post("/node-runs/{node_run_id}/execute", response_model=NodeRunExecuteResponse)
def execute_node_run(
    node_run_id: str,
    payload: NodeRunExecuteRequest,
    service: RuntimeApplicationService = Depends(get_runtime_application_service),
) -> NodeRunExecuteResponse:
    try:
        result = service.execute_node_run(node_run_id=node_run_id, payload=payload)
    except (
        CodeRunnerClientError,
        ModelGatewayClientError,
        ToolServiceClientError,
        WorkflowServiceClientError,
    ) as exc:
        raise HTTPException(status_code=502, detail=str(exc)) from exc

    if result is None:
        raise HTTPException(status_code=404, detail=f"node_run not found: {node_run_id}")

    workflow_run, node_run, executor_name = result
    return NodeRunExecuteResponse(
        run=WorkflowRunResponse.from_entity(workflow_run),
        node_run=NodeRunResponse.from_entity(node_run),
        executor_name=executor_name,
    )


@router.post("/runs/{run_id}/execute-next", response_model=NodeRunExecuteResponse)
def execute_next_node_run(
    run_id: str,
    payload: NodeRunExecuteRequest,
    tenant_id: str = Query(...),
    service: RuntimeApplicationService = Depends(get_runtime_application_service),
) -> NodeRunExecuteResponse:
    try:
        result = service.execute_next_node_run(
            tenant_id=tenant_id,
            run_id=run_id,
            payload=payload,
        )
    except (
        CodeRunnerClientError,
        ModelGatewayClientError,
        ToolServiceClientError,
        WorkflowServiceClientError,
    ) as exc:
        raise HTTPException(status_code=502, detail=str(exc)) from exc

    if result is None:
        raise HTTPException(status_code=404, detail=f"queued node_run not found for run: {run_id}")

    workflow_run, node_run, executor_name = result
    return NodeRunExecuteResponse(
        run=WorkflowRunResponse.from_entity(workflow_run),
        node_run=NodeRunResponse.from_entity(node_run),
        executor_name=executor_name,
    )


@router.post("/runs/{run_id}/execute", response_model=RunExecuteResponse)
def execute_run(
    run_id: str,
    payload: RunExecuteRequest,
    tenant_id: str = Query(...),
    service: RuntimeApplicationService = Depends(get_runtime_application_service),
) -> RunExecuteResponse:
    try:
        result = service.execute_run(
            tenant_id=tenant_id,
            run_id=run_id,
            payload=payload,
        )
    except (
        CodeRunnerClientError,
        ModelGatewayClientError,
        ToolServiceClientError,
        WorkflowServiceClientError,
    ) as exc:
        raise HTTPException(status_code=502, detail=str(exc)) from exc

    if result is None:
        raise HTTPException(status_code=404, detail=f"workflow_run not found: {run_id}")

    workflow_run, node_runs, executor_names = result
    return RunExecuteResponse(
        run=WorkflowRunResponse.from_entity(workflow_run),
        node_runs=[NodeRunResponse.from_entity(item) for item in node_runs],
        executor_names=executor_names,
    )