/* =============================================================================
 * B01_Dashboard_UI_PlanLink.ts
 * 받은 예정노선 [연결] 모달(요구서 345 3-5 · PLAN 531-4) — 본보기 `B03_FileInput_UI_PlanImport.ts`.
 *   ① 새 임도 프로젝트로 ② 기존 프로젝트에 연결(우리 회사 ROAD 프로젝트 고르기) →
 *     POST /api/dashboard/plan-routes/{assignee}/link · 지울 결과 409 confirm → 확인 창 → 다시 ·
 *   끝나면 그 임도 프로젝트 B03 으로 이동.
 * ========================================================================== */

import { API_BASE_URL, ROUTES } from "@config/config_frontend";
import {
  createButton,
  createSelectField,
  el,
  hideLoadingOverlay,
  showConfirmDialog,
  showLoadingOverlay,
  showToast,
} from "@ui/ui_template_elements";
import { openModal } from "@ui/ui_template_modal";
import { goToWorkflowStage } from "../A00_Common/b_workflow_nav";
import { fetchUserProjects } from "./B01_Dashboard_Api_Fetch";
import { L } from "./B01_Dashboard_UI_Common";

type LinkTarget = { mode: "new" } | { mode: "existing"; project_id: string };

/** 연결 — 지울 결과가 있으면 한 번 묻고 다시 · 성공 = 임도 프로젝트 id */
async function postLink(assigneeId: number, target: LinkTarget): Promise<string | null> {
  // 「LAS 없이 설계」는 B03 화면 기억값(localStorage) — 기존 프로젝트만
  const lasFree =
    target.mode === "existing" && localStorage.getItem(`b03_las_free_${target.project_id}`) === "1";
  const send = (confirmReplace: boolean): Promise<Response> =>
    fetch(`${API_BASE_URL}/dashboard/plan-routes/${assigneeId}/link`, {
      method: "POST",
      credentials: "include",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ ...target, confirm_replace: confirmReplace, las_free: lasFree }),
    });
  showLoadingOverlay();
  try {
    let response = await send(false);
    let data = (await response.json().catch(() => ({}))) as {
      confirm?: string;
      message?: string;
      detail?: unknown;
      project_id?: string;
    };
    if (response.status === 409 && data.confirm === "replace_outputs") {
      hideLoadingOverlay();
      const agreed = await showConfirmDialog(data.message ?? "", L("DE_Assigned_Link"));
      showLoadingOverlay();
      if (!agreed) return null;
      response = await send(true);
      data = (await response.json().catch(() => ({}))) as typeof data;
    }
    if (!response.ok || !data.project_id) {
      throw new Error(typeof data.detail === "string" ? data.detail : `HTTP ${response.status}`);
    }
    showToast(L("D04_Import_Done"), "success");
    return data.project_id;
  } catch (error) {
    showToast(error instanceof Error ? error.message : String(error), "error");
    return null;
  } finally {
    hideLoadingOverlay();
  }
}

export async function openPlanLinkModal(assigneeId: number, title: string): Promise<void> {
  // 사용자 프로젝트 목록 = 회사 프로젝트(서버 범위) — 그중 임도만
  const roads = (await fetchUserProjects().catch(() => [])).filter(
    (project) => (project.project_kind ?? "ROAD") === "ROAD",
  );
  const run = async (target: LinkTarget, close: () => void): Promise<void> => {
    close();
    const projectId = await postLink(assigneeId, target);
    if (projectId) await goToWorkflowStage(projectId, ROUTES.B03_FILE_INPUT);
  };
  openModal({
    title: `${L("DE_Link_Title")} — ${title}`,
    closeLabel: "×",
    mount: (body, close) => {
      const pick = createSelectField({
        label: L("DE_Link_Existing"),
        options: roads.map((project) => ({ value: project.id, text: project.name })),
      });
      const existing = createButton({
        label: L("DE_Link_Existing"),
        variant: "ghost",
        onClick: () => void run({ mode: "existing", project_id: pick.select.value }, close),
      });
      existing.disabled = !roads.length;
      body.append(
        createButton({
          label: L("DE_Link_New"),
          variant: "filled",
          onClick: () => void run({ mode: "new" }, close),
        }),
        roads.length ? pick.root : el("p", { text: L("DE_Link_NoRoad") }),
        existing,
      );
    },
  });
}