/* =============================================================================
 * B04_PreProcess_UI_TerrainViewer_Chrome.ts
 * 지표면 3D 뷰어의 **DOM 뼈대** — 상태줄·표시 토글·등고선 간격 폼·뷰포트·축척 막대·
 * 방위 컴파스·표고 범례·로딩 서클을 만들어 넘긴다.
 *
 * `B04_PreProcess_UI_TerrainViewer` 가 700줄을 넘겨 떼어낸 조각이다(2026-09-04).
 * 만드는 순서·클래스·인라인 스타일은 옮기기 전 그대로다. 이벤트 배선과 THREE 렌더링은
 * 뷰어 본체에 남아 있고, 여기서는 엘리먼트만 만든다.
 * ========================================================================== */

import { createTerrainCompass } from "@ui/ui_template_compass";
import { currentLanguageIndex, ui_locales } from "@ui/ui_template_locale";
import { createProgressCircle } from "@ui/ui_template_progress";

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

/** 뷰어 본체가 이어 쓸 엘리먼트 묶음 — 이름은 분리 전 지역변수와 같다. */
export type TerrainViewerChrome = ReturnType<typeof buildTerrainViewerChrome>;

export function buildTerrainViewerChrome() {
  const root = document.createElement("div");
  root.className = "terrain-model-group";

  const statusSpan = document.createElement("span");
  statusSpan.className = "terrain-status";
  statusSpan.style.fontSize = "var(--text-caption)";
  statusSpan.style.color = "var(--color-text-secondary)";
  statusSpan.textContent = "모델 선택 대기 중...";

  const axesCheck = document.createElement("input");
  axesCheck.type = "checkbox";
  axesCheck.checked = false;

  const rightControls = document.createElement("div");
  rightControls.className = "viewer-options model-display-options";

  // Surface Toggle
  const surfLabel = document.createElement("label");
  surfLabel.className = "toggle-label toggle-button";
  const surfCheck = document.createElement("input");
  surfCheck.type = "checkbox";
  surfCheck.checked = true;
  surfLabel.append(surfCheck, document.createTextNode(" 서피스"));

  // 스무딩(tin/dtm 전용) — 지면 필터·서피스와 함께 "지표면 분석" 컨테이너로 옮겼다.
  // 주변 입력과 양식을 맞추려고 버튼이 아니라 드롭다운이다(2026-08-01 사용자 지시).
  // 상태·재렌더 배선은 여기 그대로 두고, 페이지는 이 엘리먼트를 원하는 자리에 놓기만 한다.
  const smoothLabel = document.createElement("label");
  smoothLabel.className = "b04-surface__field";
  const smoothCaption = document.createElement("span");
  smoothCaption.textContent = L("B04_Surface_Field_Smoothing");
  const smoothSelect = document.createElement("select");
  smoothSelect.className = "b04-surface__select";
  (
    [
      ["on", "B04_Surface_Smoothing_On"],
      ["off", "B04_Surface_Smoothing_Off"],
    ] as const
  ).forEach(([value, key]) => {
    const option = document.createElement("option");
    option.value = value;
    option.textContent = L(key);
    smoothSelect.append(option);
  });
  smoothSelect.value = "on";
  smoothLabel.append(smoothCaption, smoothSelect);

  // Contour Toggle
  const contourLabel = document.createElement("label");
  contourLabel.className = "toggle-label toggle-button";
  const contourCheck = document.createElement("input");
  contourCheck.type = "checkbox";
  contourCheck.checked = true;
  contourLabel.append(contourCheck, document.createTextNode(" 등고선"));

  // Contour Interval input form
  const intervalForm = document.createElement("form");
  intervalForm.className = "contour-interval-form";

  const intervalInput = document.createElement("input");
  intervalInput.type = "number";
  intervalInput.value = "1.0";
  intervalInput.step = "0.5";
  intervalInput.min = "0.5";
  intervalInput.className = "contour-interval-input";

  const intervalSubmit = document.createElement("button");
  intervalSubmit.type = "submit";
  intervalSubmit.textContent = "적용";
  intervalSubmit.className = "contour-interval-submit";

  intervalForm.append(
    document.createTextNode("간격 "),
    intervalInput,
    document.createTextNode("m "),
    intervalSubmit,
  );

  const axesLabel = document.createElement("label");
  axesLabel.className = "toggle-label toggle-button";
  axesLabel.append(axesCheck, document.createTextNode(" 축"));
  rightControls.append(axesLabel, surfLabel, contourLabel, intervalForm);

  // 표시 토글 묶음 + 상태 줄. 컨테이너(제목)는 페이지가 만든다 — 포인트 옵션과 한 칸을 쓴다.
  const optionsContent = document.createElement("div");
  optionsContent.className = "terrain-options-content";
  optionsContent.append(rightControls, statusSpan);

  // 3D View container
  const viewerArea = document.createElement("div");
  viewerArea.className = "three-viewer";
  viewerArea.style.position = "relative";
  viewerArea.style.borderRadius = "0 0 var(--radius-cards) var(--radius-cards)";
  viewerArea.style.overflow = "hidden";

  const canvas = document.createElement("canvas");
  canvas.className = "b04-surface-viewer__canvas";
  viewerArea.append(canvas);
  root.append(viewerArea);

  // Scale bar overlay
  const scaleBar = document.createElement("div");
  scaleBar.className = "b04-surface__scale";
  scaleBar.hidden = true;

  const scaleLabel = document.createElement("span");
  scaleBar.append(scaleLabel);
  viewerArea.append(scaleBar);

  // 방위 콤파스 — 축척 막대 반대편(우하단). 바늘 각도는 애니메이션 루프가 맞춘다.
  const compass = createTerrainCompass({ className: "b04-surface__compass" });
  viewerArea.append(compass.root);

  // Elevation bounds legend bar overlay (I-403)
  const legendBar = document.createElement("div");
  legendBar.style.position = "absolute";
  legendBar.style.top = "16px";
  legendBar.style.right = "16px";
  legendBar.style.background = "rgba(255, 255, 255, 0.9)";
  legendBar.style.border = "1px solid #cbd5e1";
  legendBar.style.borderRadius = "6px";
  legendBar.style.padding = "8px";
  legendBar.style.width = "50px";
  legendBar.style.display = "none"; // hidden until contours are loaded
  legendBar.style.flexDirection = "column";
  legendBar.style.alignItems = "center";
  legendBar.style.zIndex = "10";
  legendBar.style.boxShadow = "0 2px 6px rgba(0,0,0,0.08)";
  legendBar.style.pointerEvents = "none";

  const maxValSpan = document.createElement("span");
  maxValSpan.style.fontSize = "10px";
  maxValSpan.style.fontWeight = "bold";
  maxValSpan.style.color = "#b91c1c";
  maxValSpan.style.marginBottom = "4px";

  const gradientDiv = document.createElement("div");
  gradientDiv.style.width = "12px";
  gradientDiv.style.height = "120px";
  gradientDiv.style.background =
    "linear-gradient(to bottom, #d60000 0%, #ff5100 25%, #e6a100 50%, #228b22 75%, #3a85ff 100%)";
  gradientDiv.style.borderRadius = "2px";
  gradientDiv.style.border = "1px solid #94a3b8";

  const minValSpan = document.createElement("span");
  minValSpan.style.fontSize = "10px";
  minValSpan.style.fontWeight = "bold";
  minValSpan.style.color = "#1d4ed8";
  minValSpan.style.marginTop = "4px";

  legendBar.append(maxValSpan, gradientDiv, minValSpan);
  viewerArea.append(legendBar);

  // 뷰포트 정중앙 로딩 서클 — 메쉬 파일은 수십 MB라 내려받는 동안 화면이 비어 보인다.
  const progress = createProgressCircle({ overlay: true });
  progress.root.hidden = true;
  viewerArea.append(progress.root);

  return {
    root,
    statusSpan,
    axesCheck,
    rightControls,
    surfLabel,
    surfCheck,
    smoothLabel,
    smoothCaption,
    smoothSelect,
    contourLabel,
    contourCheck,
    intervalForm,
    intervalInput,
    intervalSubmit,
    axesLabel,
    optionsContent,
    viewerArea,
    canvas,
    scaleBar,
    scaleLabel,
    compass,
    legendBar,
    maxValSpan,
    gradientDiv,
    minValSpan,
    progress,
  };
}