import {
  CURRENT_PROJECT_ID_KEY,
  ROUTES,
  UPLOAD_ALLOWED_EXT,
  UPLOAD_MAX_FILES,
  UPLOAD_MAX_MB,
} from "@config/config_frontend";
import { currentLanguageIndex, ui_locales } from "@ui/ui_template_locale";
import { createButton, createTag, showToast } from "@ui/ui_template_elements";
import { createGeneralLayout } from "@ui/ui_template_general_layout";
import { createWorkflowOverlays } from "@ui/ui_template_overlay";
import { createStepBar, WORKFLOW_STEP_ICONS } from "@ui/ui_template_workflow_layout";
import { fetchUploadOverview, type UploadedFileResult } from "./B03_FileInput_Api_Fetch";
import { clearPreloadMark } from "../A00_Common/b_asset_cache";
import { navigateTo } from "../A00_Common/router";
import { attachTempBatch } from "../B01_Dashboard/B01_Dashboard_Api_Temp";
import { clearRouteLatestCache } from "../B05_Profile/B05_Profile_Api_Fetch";
import { invalidateSectionDetail } from "../B06_Section/B06_Section_Section_Store";
import { createTempPicker } from "./B03_FileInput_UI_TempPicker";
import { workflowSteps } from "../A00_Common/b_page_scaffold";
import {
  fetchWorkflowState,
  goToWorkflowStage,
  WORKFLOW_STEP_ROUTES,
} from "../A00_Common/b_workflow_nav";
import { restoreB03ProjectState } from "./B03_FileInput_State";
import {
  confirmReplaceUpload,
  isInitialPipelineRunning,
  pollInitialPipeline,
  renderUploadResults,
  uploadOneFile,
} from "./B03_FileInput_UI_Upload";
import {
  createFileCardTemplate,
  formatBytes,
  formatEta,
  getExtension,
  initializeSlots,
  makeSessionKey,
  type FileSlot,
  type FileSlotState,
  type StoredUploadSession,
  type UploadStatus,
} from "./B03_FileInput_UI_Support";
import "./B03_FileInput_UI_Style.css";

function L(key: keyof typeof ui_locales): string {
  return ui_locales[key][currentLanguageIndex];
}

export async function renderB03FileInput(root: HTMLElement): Promise<void> {
  // 업로드가 끝나면 역할과 무관하게 종단설계로 보낸다 — 전처리(B04)는 자동 확정까지
  // 끝난 관리자 전용 점검 화면이라 일반 진행 경로가 아니다(2026-08-08 사용자 지시).
  const completionRoute = ROUTES.B05_PROFILE;
  const slots = initializeSlots();
  // 대시보드 임시 보관함에서 가져올 자료 선택기 — 선택되면 [업로드]가 이동을 수행한다.
  const tempPicker = createTempPicker(() => updateUploadButton());
  const cardMap = new Map<FileSlot, HTMLElement>();
  const resultList = document.createElement("ul");
  resultList.className = "b03-file__results";
  let uploadButton: HTMLButtonElement;
  let resumeBanner: HTMLDivElement;
  let activeProjectId = localStorage.getItem(CURRENT_PROJECT_ID_KEY) ?? "";
  // 업로드가 도는 동안은 화면 전체를 잠근다 — 같은 파일을 두 번 올리거나 도중에 다른
  // 단계로 넘어가는 것을 막는다(2026-08-08 사용자 지시).
  let pageRoot: HTMLElement | null = null;
  let isUploading = false;

  function clearDerivedCaches(projectId: string): void {
    clearRouteLatestCache(projectId);
    invalidateSectionDetail(projectId);
    clearPreloadMark();
  }

  const subtitle = document.createElement("p");
  subtitle.className = "b03-file__subtitle";
  subtitle.textContent = L("B03_File_Subtitle");

  const fileInput = document.createElement("input");
  fileInput.type = "file";
  fileInput.multiple = true;
  fileInput.accept = UPLOAD_ALLOWED_EXT.join(",");
  fileInput.className = "b03-file__native-input";

  const dropzone = document.createElement("div");
  dropzone.className = "b03-file__dropzone";
  dropzone.tabIndex = 0;
  const dropzoneLabel = document.createElement("strong");
  dropzoneLabel.textContent = L("B03_File_Select_Label");
  const dropzoneHint = document.createElement("span");
  dropzoneHint.textContent = L("B03_File_Select_Hint");
  dropzone.append(dropzoneLabel, dropzoneHint, fileInput);

  const pageError = document.createElement("p");
  pageError.className = "b03-file__error";
  pageError.setAttribute("role", "alert");

  // 업로드 버튼 안에서 도는 원 — 공용 스피너를 버튼 크기로 줄여 쓴다.
  const uploadSpinner = document.createElement("span");
  uploadSpinner.className = "ui-spinner b03-file__upload-spinner";
  uploadSpinner.setAttribute("aria-hidden", "true");

  resumeBanner = document.createElement("div");
  resumeBanner.className = "b03-file__resume";

  // 재접속 현황(서버 정본) 표시 — 전체 완료 배지와 중단 세션 안내가 여기 붙는다.
  const overviewBanner = document.createElement("div");
  overviewBanner.className = "b03-file__overview";

  const template = createFileCardTemplate();

  function selectedStates(): FileSlotState[] {
    return Array.from(slots.values()).filter((state) => state.file);
  }

  function setCardState(slot: FileSlot, stateName: "empty" | "selected" | UploadStatus): void {
    const card = cardMap.get(slot);
    if (!card) return;
    card.classList.remove(
      "b03-file__card--empty",
      "b03-file__card--selected",
      "b03-file__card--uploading",
      "b03-file__card--completed",
      "b03-file__card--failed",
      "b03-file__card--error",
    );
    const cssState = stateName === "failed" ? "error" : stateName;
    card.classList.add(`b03-file__card--${cssState}`);

    const badgeContainer = card.querySelector<HTMLDivElement>(".b03-file__card-badge-container");
    if (badgeContainer) {
      badgeContainer.replaceChildren();
      if (stateName === "empty") {
        badgeContainer.append(createTag("미등록", "neutral"));
      } else if (stateName === "selected") {
        badgeContainer.append(createTag("대기중", "neutral"));
      } else if (stateName === "uploading") {
        badgeContainer.append(createTag("업로드중", "warning"));
      } else if (stateName === "completed") {
        badgeContainer.append(createTag("완료", "success"));
      } else if (stateName === "failed") {
        badgeContainer.append(createTag("오류", "danger"));
      }
    }
  }

  /** 업로드 중 표시 — 버튼 안에 도는 원을 넣고 화면을 잠근다. */
  function setUploading(busy: boolean): void {
    isUploading = busy;
    pageRoot?.classList.toggle("b03-file--busy", busy);
    const label = uploadButton.querySelector<HTMLSpanElement>(".ui-btn__label");
    if (busy) {
      uploadButton.disabled = true;
      uploadButton.prepend(uploadSpinner);
      if (label) label.textContent = L("B03_File_Upload_Busy");
      return;
    }
    uploadSpinner.remove();
    if (label) label.textContent = L("B03_File_Upload_Button");
    updateUploadButton();
  }

  function updateUploadButton(): void {
    // 업로드가 도는 동안에는 어떤 이유로도 다시 눌리면 안 된다.
    if (isUploading) {
      uploadButton.disabled = true;
      return;
    }
    // 보관함 자료를 지정했으면 슬롯 검사와 무관하게 업로드(=이동)를 열어 준다.
    if (tempPicker.selected()) {
      uploadButton.disabled = false;
      pageError.textContent = "";
      return;
    }
    const validation = validateSlots();
    uploadButton.disabled = validation !== null;
    pageError.textContent = validation ?? "";
  }

  function renderSlot(slot: FileSlot): void {
    const state = slots.get(slot);
    const card = cardMap.get(slot);
    if (!state || !card) return;

    const fileName = card.querySelector<HTMLSpanElement>(".b03-file__file-name");
    const fileSize = card.querySelector<HTMLSpanElement>(".b03-file__file-size");
    const progress = card.querySelector<HTMLDivElement>(".b03-file__progress-bar");
    const progressBytes = card.querySelector<HTMLSpanElement>(".b03-file__progress-bytes");
    const progressSpeed = card.querySelector<HTMLSpanElement>(".b03-file__progress-speed");
    const progressEta = card.querySelector<HTMLSpanElement>(".b03-file__progress-eta");
    const error = card.querySelector<HTMLDivElement>(".b03-file__error-message");
    const remove = card.querySelector<HTMLButtonElement>(".b03-file__card-remove");

    const percent = state.file ? Math.min(100, (state.progressBytes / state.file.size) * 100) : 0;
    // 로컬 파일이 없어도 서버에 업로드된 파일이 있으면 그 정보(정본)를 보여준다.
    if (fileName) fileName.textContent = state.file?.name ?? state.serverUploaded?.name ?? "";
    if (fileSize) {
      fileSize.textContent = state.file
        ? formatBytes(state.file.size)
        : state.serverUploaded
          ? `${state.serverUploaded.sizeMb.toFixed(2)} MB`
          : "";
    }
    if (progress) progress.style.width = `${percent}%`;
    if (progressBytes) {
      progressBytes.textContent = `${L("B03_File_Progress_Bytes")}: ${formatBytes(
        state.progressBytes,
      )} / ${state.file ? formatBytes(state.file.size) : "-"}`;
    }
    if (progressSpeed) {
      progressSpeed.textContent = `${L("B03_File_Progress_Speed")}: ${state.speedMbs.toFixed(
        1,
      )} MB/s`;
    }
    if (progressEta) {
      progressEta.textContent = `${L("B03_File_Progress_Eta")}: ${formatEta(state.etaSeconds)}`;
    }
    if (error) error.textContent = state.error ?? "";
    if (remove) remove.hidden = !state.file;

    if (state.error) setCardState(slot, "failed");
    else if (!state.file) setCardState(slot, state.serverUploaded ? "completed" : "empty");
    else setCardState(slot, state.uploadStatus === "pending" ? "selected" : state.uploadStatus);
    updateUploadButton();
  }

  function showErrorMessage(slot: FileSlot, error: string): void {
    const state = slots.get(slot);
    if (!state) return;
    state.error = error;
    state.uploadStatus = "failed";
    renderSlot(slot);
  }

  function validateFileForSlot(file: File, state: FileSlotState): string | null {
    const extension = getExtension(file.name);
    const maxBytes = UPLOAD_MAX_MB * 1024 * 1024;
    if (!state.extensions.includes(extension)) return L("B03_File_Error_SlotType");
    if (file.size === 0 || file.size > maxBytes) return L("B03_File_Error_Size");
    return null;
  }

  async function assignFileToSlot(file: File, targetSlot?: FileSlot): Promise<void> {
    const extension = getExtension(file.name);
    const state = targetSlot
      ? slots.get(targetSlot)
      : Array.from(slots.values()).find((candidate) => candidate.extensions.includes(extension));
    if (!state) {
      pageError.textContent = `${L("B03_File_Error_Extension")} ${file.name}`;
      return;
    }
    const validation = validateFileForSlot(file, state);
    if (validation) {
      showErrorMessage(state.slot, `${validation} ${file.name}`);
      return;
    }
    if (!targetSlot && state.file && state.file.name !== file.name) {
      showErrorMessage(state.slot, `${L("B03_File_Error_DuplicateSlot")} ${file.name}`);
      return;
    }
    // 서버에 이미 완료된 슬롯이면 교체 확인을 받는다(2026-08-04 사용자 지시). 이어올리기로
    // 같은 파일을 다시 고르는 경우는 업로드가 미완료라 serverUploaded가 없어 묻지 않는다.
    if (state.serverUploaded) {
      const accepted = await confirmReplaceUpload(L(state.labelKey), state.serverUploaded.name);
      if (!accepted) return;
    }

    state.file = file;
    state.uploadSessionId = undefined;
    state.uploadStatus = "pending";
    state.progressBytes = 0;
    state.speedMbs = 0;
    state.etaSeconds = null;
    state.error = undefined;
    renderSlot(state.slot);
  }

  function onFileSelected(files: readonly File[], targetSlot?: FileSlot): void {
    if (files.length === 0) return;
    // 개수는 "고른 파일 수"가 아니라 **최종적으로 차는 슬롯 수**로 센다.
    // 같은 슬롯을 다시 고르는 것은 교체라 개수가 늘지 않는다 — 더하기로 세면 5개를 고른
    // 뒤 파일 선택 영역으로 하나만 바꾸려 해도 초과로 막힌다(2026-08-08).
    const occupied = new Set(selectedStates().map((state) => state.slot));
    for (const file of files) {
      const extension = getExtension(file.name);
      const slot =
        targetSlot ??
        Array.from(slots.values()).find((candidate) => candidate.extensions.includes(extension))
          ?.slot;
      if (slot) occupied.add(slot);
    }
    if (occupied.size > UPLOAD_MAX_FILES) {
      pageError.textContent = L("B03_File_Error_Count");
      return;
    }
    pageError.textContent = "";
    void (async () => {
      for (const file of files) await assignFileToSlot(file, targetSlot);
      await detectPausedUploads();
    })();
  }

  function removeFile(slot: FileSlot): void {
    const state = slots.get(slot);
    if (!state) return;
    if (activeProjectId && state.file) {
      localStorage.removeItem(makeSessionKey(activeProjectId, state.file));
    }
    state.file = undefined;
    state.uploadSessionId = undefined;
    state.uploadStatus = "pending";
    state.progressBytes = 0;
    state.speedMbs = 0;
    state.etaSeconds = null;
    state.error = undefined;
    renderSlot(slot);
  }

  function validateSlots(): string | null {
    if (!activeProjectId) return L("B03_File_Error_Project");
    const selected = selectedStates();
    if (selected.length === 0) return L("B03_File_Error_Required");
    if (selected.length > UPLOAD_MAX_FILES) return L("B03_File_Error_Count");
    // 필수 슬롯은 로컬 선택이 없어도 **서버에 이미 올라간 파일**이 있으면 충족이다 —
    // 재접속 후 파일 하나만 교체 업로드하는 흐름을 막지 않는다(2026-08-04 사용자 지시).
    const missingRequired = Array.from(slots.values()).some(
      (state) => state.isRequired && !state.file && !state.serverUploaded,
    );
    if (missingRequired) return L("B03_File_Error_RequiredSlots");
    const lasState = slots.get("las_laz");
    if (!lasState?.file && !lasState?.serverUploaded) return L("B03_File_Error_Las");
    for (const state of selected) {
      if (state.error) return state.error;
      const validation = validateFileForSlot(state.file!, state);
      if (validation) return validation;
    }
    return null;
  }

  /**
   * 재접속 현황(서버 정본) 적용 — 업로드 완료 파일을 슬롯 카드에 표시하고, 중단된 청크
   * 세션은 파일 재선택 전에도 안내하며, 전체 완료면 완료 배지를 띄운다.
   * localStorage 기반 표시(restoreB03ProjectState)는 보조로 유지된다.
   */
  async function applyUploadOverview(): Promise<void> {
    if (!activeProjectId) return;
    overviewBanner.replaceChildren();
    overviewBanner.classList.remove("is-visible");
    try {
      const overview = await fetchUploadOverview(activeProjectId);
      // 확장자 → 슬롯 매핑으로 서버 파일을 카드에 얹는다(같은 슬롯이면 최신 것 우선 — 목록이
      // id 오름차순이므로 마지막 것이 남는다).
      for (const state of slots.values()) state.serverUploaded = undefined;
      for (const file of overview.files) {
        const extension = `.${file.file_type.toLowerCase()}`;
        const state = Array.from(slots.values()).find((candidate) =>
          candidate.extensions.includes(extension),
        );
        if (state) {
          state.serverUploaded = { name: file.original_filename, sizeMb: file.file_size_mb };
        }
      }
      for (const slot of slots.keys()) renderSlot(slot);

      const notes: HTMLElement[] = [];
      if (overview.required_complete && overview.analysis_complete) {
        const complete = document.createElement("p");
        complete.className = "b03-file__overview-complete";
        complete.textContent = L("B03_File_Overview_Complete");
        notes.push(complete);
      }
      for (const session of overview.pending_sessions) {
        const pending = document.createElement("p");
        pending.className = "b03-file__overview-pending";
        pending.textContent =
          `${session.original_filename} — ${session.progress_percent}% ` +
          L("B03_File_Overview_Pending");
        notes.push(pending);
      }
      if (notes.length) {
        overviewBanner.append(...notes);
        overviewBanner.classList.add("is-visible");
      }
    } catch {
      // 현황 조회 실패는 업로드 자체를 막지 않는다 — localStorage 보조 표시로만 동작.
    }
  }

  function createFileCard(state: FileSlotState): HTMLElement {
    const fragment = template.content.cloneNode(true) as DocumentFragment;
    const card = fragment.querySelector<HTMLElement>(".b03-file__card");
    if (!card) throw new Error("file-card-template is invalid");
    card.dataset.slotId = state.slot;
    card.querySelector(".b03-file__card-icon")!.textContent = state.icon;
    card.querySelector(".b03-file__card-label")!.textContent = L(state.labelKey);
    // 지형 래스터만 선택 항목이라 확장자 옆에 표시해 둔다.
    const extLabel = state.extensions.join(", ");
    card.querySelector(".b03-file__card-ext")!.textContent = state.isRequired
      ? extLabel
      : `${extLabel} · ${L("B03_File_Card_Optional")}`;
    const input = card.querySelector<HTMLInputElement>(".b03-file__slot-input")!;
    input.accept = state.extensions.join(",");
    const select = card.querySelector<HTMLButtonElement>(".b03-file__card-select")!;
    select.textContent = L("B03_File_Card_Select");
    select.addEventListener("click", () => input.click());
    input.addEventListener("change", () => {
      onFileSelected(input.files ? Array.from(input.files) : [], state.slot);
      input.value = "";
    });
    const remove = card.querySelector<HTMLButtonElement>(".b03-file__card-remove")!;
    remove.textContent = "×";
    remove.title = L("B03_File_Card_Remove");
    remove.setAttribute("aria-label", L("B03_File_Card_Remove"));
    remove.addEventListener("click", () => removeFile(state.slot));
    cardMap.set(state.slot, card);
    return card;
  }

  function createCardGroup(title: string, groupSlots: readonly FileSlot[]): HTMLElement {
    const group = document.createElement("section");
    group.className = "b03-file__group";
    if (title) {
      const groupTitle = document.createElement("h3");
      groupTitle.className = "b03-file__group-title";
      groupTitle.textContent = title;
      group.append(groupTitle);
    }
    const content = document.createElement("div");
    content.className = "b03-file__group-content";
    for (const slot of groupSlots) {
      const state = slots.get(slot);
      if (state) content.append(createFileCard(state));
    }
    group.append(content);
    return group;
  }

  async function detectPausedUploads(): Promise<void> {
    activeProjectId = localStorage.getItem(CURRENT_PROJECT_ID_KEY) ?? "";
    resumeBanner.replaceChildren();
    resumeBanner.classList.remove("is-visible");
    if (!activeProjectId) return;

    for (const state of selectedStates()) {
      const stored = localStorage.getItem(makeSessionKey(activeProjectId, state.file!));
      if (!stored) continue;
      const session = JSON.parse(stored) as StoredUploadSession;
      state.uploadSessionId = session.uploadSessionId;
      state.progressBytes = session.completedChunks * session.chunkSizeBytes;
      renderSlot(state.slot);
      const text = document.createElement("span");
      text.textContent = `${L("B03_File_Status_Detected")}: ${session.fileName}`;
      const resume = createButton({
        label: L("B03_File_Resume_Button"),
        variant: "ghost",
        onClick: () => void startChunkedUpload([state]),
      });
      const fresh = createButton({
        label: L("B03_File_New_Button"),
        variant: "ghost",
        onClick: () => {
          localStorage.removeItem(session.key);
          state.uploadSessionId = undefined;
          state.progressBytes = 0;
          renderSlot(state.slot);
          resumeBanner.replaceChildren();
          resumeBanner.classList.remove("is-visible");
        },
      });
      resumeBanner.append(text, resume, fresh);
      resumeBanner.classList.add("is-visible");
      break;
    }
  }

  /** 분석 대기 — 자동 확정이 보류되면 그 사유를 화면과 알림으로 남긴다. */
  const pollAnalysis = (projectId: string): Promise<boolean> =>
    pollInitialPipeline(projectId, (message) => {
      pageError.textContent = message;
      showToast(message, "warning");
    });

  /**
   * 보관함 자료를 이 프로젝트로 옮기고 초기 분석까지 이어 간다.
   * 파일을 직접 고른 게 아니라 이미 서버에 있는 자료를 옮기는 것이라 청크 업로드를 타지
   * 않는다 — 이동이 끝나면 같은 분석 대기 흐름으로 합류한다.
   */
  async function attachSelectedTempBatch(): Promise<void> {
    const batch = tempPicker.selected();
    if (!batch) return;
    activeProjectId = localStorage.getItem(CURRENT_PROJECT_ID_KEY) ?? "";
    if (!activeProjectId) {
      pageError.textContent = L("B03_File_Error_Project");
      return;
    }
    pageError.textContent = "";
    try {
      const result = await attachTempBatch(activeProjectId, batch.batch_id);
      clearDerivedCaches(activeProjectId);
      tempPicker.clear();
      showToast(L("B03_Temp_Attach_Success"), "success");
      await applyUploadOverview();
      if (!result.analysis_started) {
        showToast(L("B03_Temp_Attach_NoAnalysis"), "warning");
        return;
      }
      showToast(L("B03_File_Analysis_InProgress"), "info");
      const analysisComplete = await pollAnalysis(activeProjectId);
      if (analysisComplete) {
        navigateTo(completionRoute);
      } else {
        showToast(L("B03_File_Analysis_StillRunning"), "warning");
      }
    } catch (error) {
      const detail = error instanceof Error ? error.message : L("B03_Temp_Attach_Failed");
      pageError.textContent = `${L("B03_Temp_Attach_Failed")} ${detail}`;
      showToast(L("B03_Temp_Attach_Failed"), "error");
    }
  }

  /**
   * 새로고침·재진입해도 초기 자동 계산이 도는 중이면 업로드 버튼을 다시 잠근다.
   * 잠금이 화면 상태로만 남아 있으면 새로고침 한 번으로 풀려 자료를 겹쳐 올릴 수 있다.
   */
  async function relockWhileInitialPipelineRuns(): Promise<void> {
    if (!activeProjectId || isUploading) return;
    try {
      const state = await fetchWorkflowState(activeProjectId);
      if (!isInitialPipelineRunning(state)) return;
    } catch {
      return; // 상태를 못 읽으면 잠그지 않는다 — 서버가 막아 준다.
    }
    setUploading(true);
    showToast(L("B03_File_Analysis_InProgress"), "info");
    try {
      const done = await pollAnalysis(activeProjectId);
      if (done) showToast(L("B03_File_Upload_Success"), "success");
    } finally {
      setUploading(false);
      void applyUploadOverview();
    }
  }

  async function startChunkedUpload(targetStates = selectedStates()): Promise<void> {
    if (isUploading) return;
    // 보관함에서 불러온 자료가 지정돼 있으면 그것을 옮기는 것이 이 버튼의 동작이다.
    if (tempPicker.selected()) {
      setUploading(true);
      try {
        await attachSelectedTempBatch();
      } finally {
        setUploading(false);
      }
      return;
    }
    activeProjectId = localStorage.getItem(CURRENT_PROJECT_ID_KEY) ?? "";
    const validation = validateSlots();
    if (validation) {
      pageError.textContent = validation;
      return;
    }

    pageError.textContent = "";
    setUploading(true);
    const uploaded: UploadedFileResult[] = [];
    try {
      for (let index = 0; index < targetStates.length; index += 1) {
        const state = targetStates[index];
        uploaded.push(
          ...(await uploadOneFile(activeProjectId, state, index === targetStates.length - 1, () =>
            renderSlot(state.slot),
          )),
        );
      }
      clearDerivedCaches(activeProjectId);
      renderUploadResults(resultList, uploaded);
      showToast(L("B03_File_Upload_Success"), "success");

      showToast(L("B03_File_Analysis_InProgress"), "info");
      const analysisComplete = await pollAnalysis(activeProjectId);

      if (analysisComplete) {
        navigateTo(completionRoute);
      } else {
        showToast(L("B03_File_Analysis_StillRunning"), "warning");
      }
    } catch (error) {
      const failed = targetStates.find((state) => state.uploadStatus === "uploading");
      const detail = error instanceof Error ? error.message : L("B03_File_Upload_Failed");
      if (failed) showErrorMessage(failed.slot, detail);
      pageError.textContent = `${L("B03_File_Upload_Failed")} ${detail}`;
      showToast(L("B03_File_Upload_Failed"), "error");
    } finally {
      setUploading(false);
    }
  }

  async function registerB03ServiceWorker(): Promise<void> {
    if (!("serviceWorker" in navigator)) {
      showToast(L("B03_File_ServiceWorker_Unavailable"), "warning");
      return;
    }
    try {
      const registration = await navigator.serviceWorker.register(
        new URL("./B03_FileInput_ServiceWorker.ts", import.meta.url),
        { type: "module" },
      );
      registration.active?.postMessage({ type: "B03_SW_PING" });
      showToast(L("B03_File_ServiceWorker_Ready"), "info");
    } catch {
      showToast(L("B03_File_ServiceWorker_Unavailable"), "warning");
    }
  }

  function onB03_File_Select_Change(): void {
    onFileSelected(fileInput.files ? Array.from(fileInput.files) : []);
    fileInput.value = "";
  }

  function onB03_File_Drop(event: DragEvent): void {
    event.preventDefault();
    dropzone.classList.remove("is-dragging");
    onFileSelected(event.dataTransfer?.files ? Array.from(event.dataTransfer.files) : []);
  }

  fileInput.addEventListener("change", onB03_File_Select_Change);
  dropzone.addEventListener("click", () => fileInput.click());
  dropzone.addEventListener("keydown", (event) => {
    if (event.key === "Enter" || event.key === " ") fileInput.click();
  });
  dropzone.addEventListener("dragover", (event) => {
    event.preventDefault();
    dropzone.classList.add("is-dragging");
  });
  dropzone.addEventListener("dragleave", () => dropzone.classList.remove("is-dragging"));
  dropzone.addEventListener("drop", onB03_File_Drop);

  uploadButton = createButton({
    label: L("B03_File_Upload_Button"),
    variant: "filled",
    onClick: () => void startChunkedUpload(),
    disabled: true,
  });

  const uploadControlPanel = document.createElement("div");
  uploadControlPanel.className = "b03-file__control-panel";
  uploadControlPanel.append(
    subtitle,
    overviewBanner,
    dropzone,
    // 대시보드 임시 보관함에서 자료를 끌어오는 자리 — 업로드 컨테이너 안에 둔다.
    tempPicker.root,
    resumeBanner,
    pageError,
    uploadButton,
    resultList,
  );

  // 계획노선과 지형 자료는 지형 래스터(tif)만 빼면 모두 필수라 따로 묶지 않는다
  // (2026-08-08 사용자 지시).
  const inputsGroup = createCardGroup(L("B03_File_Group_Inputs"), [
    "csv",
    "las_laz",
    "prj",
    "tfw",
    "tif",
  ]);

  const cardsContainer = document.createElement("div");
  cardsContainer.className = "b03-file__control-panel b03-file__cards-container-panel";
  cardsContainer.append(inputsGroup);

  const workflowState = activeProjectId
    ? await fetchWorkflowState(activeProjectId).catch(() => undefined)
    : undefined;
  const steps = workflowSteps();
  const progressContent = createStepBar(steps, 0, {
    stages: workflowState?.stages,
    currentStage: workflowState?.current_stage,
    routes: WORKFLOW_STEP_ROUTES,
    orientation: "vertical",
    icons: WORKFLOW_STEP_ICONS,
    onStepClick: (stepIndex) => {
      if (activeProjectId) {
        goToWorkflowStage(activeProjectId, WORKFLOW_STEP_ROUTES[stepIndex]);
      }
    },
    // B03은 일반 레이아웃을 쓰느라 오버레이를 직접 조립한다 — createWorkflowLayout이
    // 넘겨 주던 대시보드 탈출구를 여기서도 똑같이 달아야 다른 단계 화면과 어긋나지 않는다.
    homeButton: true,
  });
  const layout = createGeneralLayout({
    pageClass: "b03-file",
    content: [uploadControlPanel, cardsContainer],
  });
  layout.content.classList.add("b03-file__main-layout");
  const overlays = createWorkflowOverlays({
    title: L("B03_File_Title"),
    progressContent,
    showTitlePanel: false,
  });
  layout.root.append(overlays.root);
  pageRoot = layout.root;
  root.replaceChildren(layout.root);

  for (const slot of slots.keys()) renderSlot(slot);
  void relockWhileInitialPipelineRuns();
  void registerB03ServiceWorker();
  void applyUploadOverview();
  void detectPausedUploads();
  if (activeProjectId) {
    restoreB03ProjectState({
      projectId: activeProjectId,
      label: L("B03_File_Restore_State"),
      container: resumeBanner,
      poll: pollAnalysis,
      onComplete: () => navigateTo(completionRoute),
    });
  }
}