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

from app.application.services import (
    RuntimeApplicationService,
    RuntimeDebugSnapshot,
    build_runtime_application_service,
)
from app.bootstrap.settings import RuntimeServiceSettings
from app.db.session import get_db
from app.infrastructure.code_runner_client import CodeRunnerClientError
from app.infrastructure.human_client import HumanServiceClientError
from app.infrastructure.model_gateway_client import ModelGatewayClientError
from app.infrastructure.tool_client import ToolServiceClientError
from app.infrastructure.workflow_client import WorkflowServiceClientError
from app.schemas.run import (
    ExecutionLogResponse,
    HumanNodeResumeRequest,
    NodeArtifactResponse,
    NodeRunExecuteRequest,
    NodeRunExecuteResponse,
    NodeRunResponse,
    NodeRunStatusUpdateRequest,
    RunBootstrapResponse,
    RunCreateRequest,
    RunExecuteRequest,
    RunExecuteResponse,
    RuntimeDebugContinueRequest,
    RuntimeDebugSnapshotResponse,
    RuntimeDebugStepResponse,
    TraceSpanResponse,
    WorkerExecuteNextRequest,
    WorkerExecuteNextResponse,
    WorkflowRunResponse,
    WorkflowRunStatusUpdateRequest,
)

router = APIRouter()


def build_runtime_debug_snapshot_response(snapshot: RuntimeDebugSnapshot) -> RuntimeDebugSnapshotResponse:
    return RuntimeDebugSnapshotResponse(
        run=WorkflowRunResponse.from_entity(snapshot.run),
        node_runs=[
            NodeRunResponse.from_entity(item)
            for item in snapshot.node_runs
        ],
        run_state_json=snapshot.run_state_json,
        node_output_json_by_node_id=snapshot.node_output_json_by_node_id,
        node_output_text_by_node_id=snapshot.node_output_text_by_node_id,
        queued_node_ids=snapshot.queued_node_ids,
        running_node_ids=snapshot.running_node_ids,
        completed_node_ids=snapshot.completed_node_ids,
        failed_node_ids=snapshot.failed_node_ids,
        execution_logs=[
            ExecutionLogResponse.from_entity(item)
            for item in snapshot.execution_logs
        ],
        node_artifacts=[
            NodeArtifactResponse.from_entity(item)
            for item in snapshot.node_artifacts
        ],
        trace_spans=[
            TraceSpanResponse.from_entity(item)
            for item in snapshot.trace_spans
        ])


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 build_runtime_application_service(db=db, settings=settings)


@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,
        HumanServiceClientError,
        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(
    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(session_id=session_id)
    ]


@router.get("/node-runs", response_model=list[NodeRunResponse])
def list_node_runs(
    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(run_id=run_id)
    ]


@router.get("/execution-logs", response_model=list[ExecutionLogResponse])
def list_execution_logs(
    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(
            run_id=run_id,
            node_run_id=node_run_id)
    ]


@router.get("/node-artifacts", response_model=list[NodeArtifactResponse])
def list_node_artifacts(
    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(
            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(
    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(
            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,
        HumanServiceClientError,
        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,
    service: RuntimeApplicationService = Depends(get_runtime_application_service)) -> NodeRunExecuteResponse:
    try:
        result = service.execute_next_node_run(
            run_id=run_id,
            payload=payload)
    except (
        CodeRunnerClientError,
        ModelGatewayClientError,
        HumanServiceClientError,
        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,
    service: RuntimeApplicationService = Depends(get_runtime_application_service)) -> RunExecuteResponse:
    try:
        result = service.execute_run(
            run_id=run_id,
            payload=payload)
    except (
        CodeRunnerClientError,
        ModelGatewayClientError,
        HumanServiceClientError,
        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)


@router.get("/runs/{run_id}/debug/snapshot", response_model=RuntimeDebugSnapshotResponse)
def get_runtime_debug_snapshot(
    run_id: str,
    service: RuntimeApplicationService = Depends(get_runtime_application_service)) -> RuntimeDebugSnapshotResponse:
    snapshot = service.get_debug_snapshot(run_id=run_id)
    if snapshot is None:
        raise HTTPException(status_code=404, detail=f"workflow_run not found: {run_id}")
    return build_runtime_debug_snapshot_response(snapshot)


@router.post("/runs/{run_id}/debug/pause", response_model=RuntimeDebugSnapshotResponse)
def pause_runtime_debug_run(
    run_id: str,
    service: RuntimeApplicationService = Depends(get_runtime_application_service)) -> RuntimeDebugSnapshotResponse:
    snapshot = service.pause_run(run_id=run_id)
    if snapshot is None:
        raise HTTPException(status_code=404, detail=f"workflow_run not found: {run_id}")
    return build_runtime_debug_snapshot_response(snapshot)


@router.post("/runs/{run_id}/debug/resume", response_model=RuntimeDebugSnapshotResponse)
def resume_runtime_debug_run(
    run_id: str,
    service: RuntimeApplicationService = Depends(get_runtime_application_service)) -> RuntimeDebugSnapshotResponse:
    snapshot = service.resume_run(run_id=run_id)
    if snapshot is None:
        raise HTTPException(status_code=404, detail=f"workflow_run not found: {run_id}")
    return build_runtime_debug_snapshot_response(snapshot)


@router.post("/runs/{run_id}/debug/step", response_model=RuntimeDebugStepResponse)
def step_runtime_debug_run(
    run_id: str,
    payload: NodeRunExecuteRequest,
    service: RuntimeApplicationService = Depends(get_runtime_application_service)) -> RuntimeDebugStepResponse:
    result = service.step_debug_run(
        run_id=run_id,
        worker_key=payload.worker_key)
    if result is None:
        raise HTTPException(status_code=404, detail=f"workflow_run not found: {run_id}")
    snapshot, executed_node_runs, executor_names, reason = result
    return RuntimeDebugStepResponse(
        snapshot=build_runtime_debug_snapshot_response(snapshot),
        executed_node_runs=[NodeRunResponse.from_entity(item) for item in executed_node_runs],
        executor_names=executor_names,
        reason=reason)


@router.post("/runs/{run_id}/debug/continue", response_model=RuntimeDebugStepResponse)
def continue_runtime_debug_run(
    run_id: str,
    payload: RuntimeDebugContinueRequest,
    service: RuntimeApplicationService = Depends(get_runtime_application_service)) -> RuntimeDebugStepResponse:
    result = service.continue_debug_run(
        run_id=run_id,
        payload=payload)
    if result is None:
        raise HTTPException(status_code=404, detail=f"workflow_run not found: {run_id}")
    snapshot, executed_node_runs, executor_names, paused_before_node_id, reason = result
    return RuntimeDebugStepResponse(
        snapshot=build_runtime_debug_snapshot_response(snapshot),
        executed_node_runs=[NodeRunResponse.from_entity(item) for item in executed_node_runs],
        executor_names=executor_names,
        paused_before_node_id=paused_before_node_id,
        reason=reason)


@router.post("/node-runs/{node_run_id}/resume-human", response_model=NodeRunExecuteResponse)
def resume_human_node_run(
    node_run_id: str,
    payload: HumanNodeResumeRequest,
    service: RuntimeApplicationService = Depends(get_runtime_application_service)) -> NodeRunExecuteResponse:
    try:
        result = service.resume_human_node_run(
            node_run_id=node_run_id,
            payload=payload)
    except (
        CodeRunnerClientError,
        ModelGatewayClientError,
        HumanServiceClientError,
        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"human node_run not found or task mismatch: {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("/workers/execute-next", response_model=WorkerExecuteNextResponse)
def execute_next_worker_task(
    payload: WorkerExecuteNextRequest,
    settings: RuntimeServiceSettings = Depends(get_runtime_settings),
    service: RuntimeApplicationService = Depends(get_runtime_application_service)) -> WorkerExecuteNextResponse:
    try:
        result = service.execute_next_claimed_node_run(
            worker_key=payload.worker_key,
            lease_seconds=payload.lease_seconds or settings.worker_lease_seconds)
    except (
        CodeRunnerClientError,
        ModelGatewayClientError,
        HumanServiceClientError,
        ToolServiceClientError,
        WorkflowServiceClientError) as exc:
        raise HTTPException(status_code=502, detail=str(exc)) from exc

    if result is None:
        raise HTTPException(status_code=404, detail="queued worker task not found")

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