from core_domain import ServiceHealth
from core_dsl import EdgeDefinition, NodeDefinition, WorkflowDefinition
from fastapi import APIRouter, Depends, HTTPException, Query
from sqlalchemy import text
from sqlalchemy.orm import Session

from app.application.services import WorkflowApplicationService
from app.db.session import get_db
from app.domain.repositories import (
    AppDefinitionRepository,
    AppVersionRepository,
    WorkflowDefinitionRepository,
    WorkflowVersionRepository,
)
from app.schemas.app import (
    AppCreateRequest,
    AppResponse,
    AppVersionCreateRequest,
    AppVersionResponse,
)
from app.schemas.workflow import (
    WorkflowCreateRequest,
    WorkflowDebuggerPlanRequest,
    WorkflowDebuggerPlanResponse,
    WorkflowDefinitionResponse,
    WorkflowDesignerValidateRequest,
    WorkflowDesignerValidateResponse,
    WorkflowVersionCreateRequest,
    WorkflowVersionResponse,
)

router = APIRouter()


def get_workflow_application_service(db: Session = Depends(get_db)) -> WorkflowApplicationService:
    return WorkflowApplicationService(
        app_repository=AppDefinitionRepository(db),
        workflow_repository=WorkflowDefinitionRepository(db),
        app_version_repository=AppVersionRepository(db),
        workflow_version_repository=WorkflowVersionRepository(db))


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


@router.get("/sample", response_model=WorkflowDefinition)
def get_sample_workflow() -> WorkflowDefinition:
    return WorkflowDefinition(
        code="sample_workflow",
        name="Sample Workflow",
        nodes=[
            NodeDefinition(id="start", type="llm"),
            NodeDefinition(id="end", type="answer"),
        ],
        edges=[EdgeDefinition(source="start", target="end")])


@router.post("/designer/validate", response_model=WorkflowDesignerValidateResponse)
def validate_workflow_designer_dsl(
    payload: WorkflowDesignerValidateRequest,
    service: WorkflowApplicationService = Depends(get_workflow_application_service)) -> WorkflowDesignerValidateResponse:
    inspection = service.validate_designer_workflow(payload)
    return WorkflowDesignerValidateResponse.from_inspection(inspection)


@router.post("/designer/debug", response_model=WorkflowDebuggerPlanResponse)
def debug_workflow_designer_dsl(
    payload: WorkflowDebuggerPlanRequest,
    service: WorkflowApplicationService = Depends(get_workflow_application_service)) -> WorkflowDebuggerPlanResponse:
    plan = service.build_designer_debug_plan(payload)
    return WorkflowDebuggerPlanResponse.from_plan(plan)


@router.post("/apps", response_model=AppResponse)
def create_app(
    payload: AppCreateRequest,
    service: WorkflowApplicationService = Depends(get_workflow_application_service)) -> AppResponse:
    entity = service.create_app(payload)
    return AppResponse.from_entity(entity)


@router.get("/apps", response_model=list[AppResponse])
def list_apps(
    service: WorkflowApplicationService = Depends(get_workflow_application_service)) -> list[AppResponse]:
    return [AppResponse.from_entity(item) for item in service.list_apps()]


@router.post("/apps/versions", response_model=AppVersionResponse)
def create_app_version(
    payload: AppVersionCreateRequest,
    service: WorkflowApplicationService = Depends(get_workflow_application_service)) -> AppVersionResponse:
    entity = service.create_app_version(payload)
    return AppVersionResponse.from_entity(entity)


@router.get("/apps/versions", response_model=list[AppVersionResponse])
def list_app_versions(
    app_id: str = Query(...),
    service: WorkflowApplicationService = Depends(get_workflow_application_service)) -> list[AppVersionResponse]:
    return [AppVersionResponse.from_entity(item) for item in service.list_app_versions(app_id)]


@router.post("", response_model=WorkflowDefinitionResponse)
def create_workflow(
    payload: WorkflowCreateRequest,
    service: WorkflowApplicationService = Depends(get_workflow_application_service)) -> WorkflowDefinitionResponse:
    entity = service.create_workflow(payload)
    return WorkflowDefinitionResponse.from_entity(entity)


@router.get("", response_model=list[WorkflowDefinitionResponse])
def list_workflows(
    app_id: str | None = Query(default=None),
    service: WorkflowApplicationService = Depends(get_workflow_application_service)) -> list[WorkflowDefinitionResponse]:
    items = service.list_workflows(app_id=app_id)
    return [WorkflowDefinitionResponse.from_entity(item) for item in items]


@router.post("/versions", response_model=WorkflowVersionResponse)
def create_workflow_version(
    payload: WorkflowVersionCreateRequest,
    service: WorkflowApplicationService = Depends(get_workflow_application_service)) -> WorkflowVersionResponse:
    try:
        entity = service.create_workflow_version(payload)
    except ValueError as exc:
        raise HTTPException(status_code=422, detail=str(exc)) from exc
    return WorkflowVersionResponse.from_entity(entity)


@router.get("/versions", response_model=list[WorkflowVersionResponse])
def list_workflow_versions(
    workflow_id: str = Query(...),
    service: WorkflowApplicationService = Depends(get_workflow_application_service)) -> list[WorkflowVersionResponse]:
    items = service.list_workflow_versions(workflow_id=workflow_id)
    return [WorkflowVersionResponse.from_entity(item) for item in items]


@router.get("/versions/{workflow_version_id}", response_model=WorkflowVersionResponse)
def get_workflow_version(
    workflow_version_id: str,
    service: WorkflowApplicationService = Depends(get_workflow_application_service)) -> WorkflowVersionResponse:
    entity = service.get_workflow_version(workflow_version_id=workflow_version_id)
    if entity is None:
        raise HTTPException(status_code=404, detail=f"workflow_version not found: {workflow_version_id}")
    return WorkflowVersionResponse.from_entity(entity)


@router.get("/versions/{workflow_version_id}/debug", response_model=WorkflowDebuggerPlanResponse)
def debug_workflow_version(
    workflow_version_id: str,
    max_preview_steps: int = Query(default=50, ge=1, le=500),
    service: WorkflowApplicationService = Depends(get_workflow_application_service)) -> WorkflowDebuggerPlanResponse:
    plan = service.build_version_debug_plan(
        workflow_version_id=workflow_version_id,
        max_preview_steps=max_preview_steps)
    if plan is None:
        raise HTTPException(status_code=404, detail=f"workflow_version not found: {workflow_version_id}")
    return WorkflowDebuggerPlanResponse.from_plan(plan)