/* =============================================================================
 * D03_PlanAnalysis_UI_3D.ts
 * D03 [3D] 큰 모달(PLAN 530-3 · 563-1) — 사업 전체 DEM + 그은 선 하나(지반에 붙임) + 측점 막대.
 *   선 고름 = 모달 위 칸(본선 · 갈래) · 뷰어 = B05 `createRouteViewer` 그대로 · 닫으면 버림(WebGL 문맥까지).
 *   예상 코리도 없음(꺾은선 · 계획고 = 지반고라 절성토 0 — 요구서 389 3장 11).
 * ========================================================================== */

import "../B05_Profile/B05_Profile_UI_Style.css";
import { createSelectField } from "@ui/ui_template_input";
import { openModal } from "@ui/ui_template_modal";
import { createProgressCircle } from "@ui/ui_template_progress";
import { showToast } from "@ui/ui_template_elements";
import type { DtmGrid } from "../common_util/common_util_surface_sampler";
import { createRouteViewer, type RouteViewer } from "../B05_Profile/B05_Profile_UI_Viewer";
import { sectionsGround } from "../B05_Profile/logic/B05_Profile_Sections_Ground";
import type { Vertex } from "./logic/D03_PlanAnalysis_Plan";

export interface Plan3dLine {
  name: string;
  line: Vertex[];
  /** 선 위 측점 누가(선마다 No.0 부터). */
  stations: number[];
}

/** 격자 → 뷰어 상자(지형에 붙는 선 · 막대는 높이 원점과 무관 · x · y 만 메시와 맞으면 됨). */
function gridBounds(grid: DtmGrid): {
  x: [number, number];
  y: [number, number];
  z: [number, number];
} {
  let low = Infinity;
  let high = -Infinity;
  for (const z of grid.z) {
    if (!Number.isFinite(z)) continue;
    if (z < low) low = z;
    if (z > high) high = z;
  }
  return {
    x: [grid.x[0], grid.x[grid.x.length - 1]],
    y: [grid.y[0], grid.y[grid.y.length - 1]],
    z: [low, high],
  };
}

export function openPlan3d(
  projectId: string,
  surface: { modelId: number; grid: DtmGrid },
  lines: Plan3dLine[],
): void {
  if (!lines.length) return void showToast("3D 로 볼 선이 없습니다.", "warning");
  let viewer: RouteViewer | null = createRouteViewer();
  let loaded = false;
  const pick = createSelectField({
    options: lines.map((item, i) => ({ value: String(i), text: item.name })),
    value: "0",
    size: 28,
    ariaLabel: "선",
  }).select;
  pick.classList.add("d03-plan__3d-year");
  const top = document.createElement("div");
  top.className = "d03-plan__3d-top";
  top.append(pick);

  const load = async (index: number): Promise<void> => {
    const item = lines[index] ?? lines[0];
    if (!viewer) return;
    const progress = createProgressCircle({ label: "3D 지형을 불러오는 중…", overlay: true });
    progress.set(null);
    viewer.root.append(progress.root);
    const started = performance.now();
    const stat: Record<string, unknown> = { line: item.name, done: false };
    (window as unknown as { __d03Plan3d?: unknown }).__d03Plan3d = stat;
    try {
      if (!loaded) {
        await viewer.loadSurface(
          projectId,
          surface.modelId,
          "dtm",
          true,
          5,
          gridBounds(surface.grid),
        );
        loaded = true;
      }
      if (!viewer) return;
      viewer.markers.renderRoute(item.line.map(([x, y]) => ({ x, y })));
      const ground = sectionsGround(item.line, item.stations, surface.grid);
      viewer.renderStationLines(
        ground.stations.map((station, i) => ({
          station_id: String(item.stations[i] ?? station.chainage_m),
          center_x: station.center_x,
          center_y: station.center_y,
          center_z: station.center_z,
          frame: { left_xy: station.left_xy },
          kind: "regular",
          chainage_m: item.stations[i] ?? station.chainage_m,
        })),
        2.5,
      );
      stat.stations = ground.stations.length;
      viewer.setView("iso");
    } catch (error) {
      showToast(error instanceof Error ? error.message : "3D 지형을 불러오지 못했습니다.", "error");
    } finally {
      stat.done = true;
      stat.totalMs = Math.round(performance.now() - started);
      progress.remove();
    }
  };
  pick.addEventListener("change", () => void load(Number(pick.value)));

  openModal({
    title: "3D 보기 — 지형 + 그은 선",
    closeLabel: "닫기",
    wide: true,
    dialogClass: "d03-plan__3d-modal",
    mount: (body) => {
      body.classList.add("d03-plan__3d-body");
      body.append(top, viewer!.root);
      viewer!.setActive(true);
    },
    beforeClose: () => {
      viewer?.dispose();
      viewer = null;
      return true;
    },
  });
  void load(0);
}