import {
  API_BASE_URL,
  CURRENT_PROJECT_ID_KEY,
  ROUTES,
  type RoutePath,
} from "@config/config_frontend";
import type { WorkflowStage } from "@ui/ui_template_workflow_layout";
import { isProjectPreloaded, setPreloadTarget } from "./b_asset_cache";
import { navigateTo } from "./router";

export interface WorkflowState {
  project_id: string;
  current_stage: number;
  stages: WorkflowStage[];
}

export const WORKFLOW_STEP_ROUTES: readonly RoutePath[] = [
  ROUTES.B03_FILE_INPUT,
  ROUTES.B04_WF1_SURFACE,
  ROUTES.B05_WF2_ROUTE,
  ROUTES.B06_WF3_PROFILE_CROSS,
  ROUTES.B07_WF4_DESIGN_DETAIL,
  ROUTES.B08_WF5_QUANTITY,
  ROUTES.B09_WF6_ESTIMATION,
];

export async function fetchWorkflowState(projectId: string): Promise<WorkflowState> {
  const response = await fetch(`${API_BASE_URL}/projects/${projectId}/workflow-state`, {
    credentials: "include",
  });
  if (!response.ok) {
    throw new Error(`Workflow state request failed: ${response.status}`);
  }
  const data = await response.json();
  return data.workflow_state ?? data;
}

export function goToWorkflowStage(projectId: string, route: RoutePath): void {
  localStorage.setItem(CURRENT_PROJECT_ID_KEY, projectId);
  // 이 프로젝트를 아직 준비하지 않았으면 준비 화면(B11)을 먼저 거친다. 거기서 3D 지표면과
  // 등고선을 브라우저에 담고 원래 가려던 화면으로 넘겨준다. 같은 프로젝트로 다시 들어오면
  // 건너뛴다(2026-08-01 사용자 지시).
  if (!isProjectPreloaded(projectId)) {
    setPreloadTarget(route);
    navigateTo(ROUTES.B11_LOADING);
    return;
  }
  navigateTo(route);
}