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

from core_dsl import EdgeDefinition, NodeDefinition, WorkflowDefinition
from core_domain import ServiceHealth
from app.application.services import WorkflowApplicationService
from app.domain.repositories import (
    AppDefinitionRepository,
    AppVersionRepository,
    WorkflowDefinitionRepository,
    WorkflowVersionRepository,
)
from app.db.session import get_db
from app.schemas.app import AppCreateRequest, AppResponse, AppVersionCreateRequest, AppVersionResponse
from app.schemas.workflow import (
    WorkflowCreateRequest,
    WorkflowDefinitionResponse,
    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("/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(
    tenant_id: str = Query(...),
    service: WorkflowApplicationService = Depends(get_workflow_application_service),
) -> list[AppResponse]:
    return [AppResponse.from_entity(item) for item in service.list_apps(tenant_id)]


@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(
    tenant_id: str = Query(...),
    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(tenant_id, 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(
    tenant_id: str = Query(...),
    app_id: str | None = Query(default=None),
    service: WorkflowApplicationService = Depends(get_workflow_application_service),
) -> list[WorkflowDefinitionResponse]:
    items = service.list_workflows(tenant_id=tenant_id, 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(
    tenant_id: str = Query(...),
    workflow_id: str = Query(...),
    service: WorkflowApplicationService = Depends(get_workflow_application_service),
) -> list[WorkflowVersionResponse]:
    items = service.list_workflow_versions(tenant_id=tenant_id, 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,
    tenant_id: str = Query(...),
    service: WorkflowApplicationService = Depends(get_workflow_application_service),
) -> WorkflowVersionResponse:
    entity = service.get_workflow_version(tenant_id=tenant_id, 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)