/* =============================================================================
 * D03_PlanAnalysis_UI_3D.ts
 * D03 [3D] 큰 모달(PLAN 530-3 · 563-1 · 601-3 · 요구 463-21) — 사업 전체 DEM + 노선망 전체(본선 · 갈래) 한 번에.
 *   선마다 예상 코리도 = 측점 예상 단면(`logic/D03_PlanAnalysis_Expect` · 리핑암 · 산쪽 절토 · 일반 측구 ·
 *   계획고 = 지반고) → B05 `buildCorridor` → 뷰어 `setCorridors`(벌마다 노면 · 지형 잘림 한 번) ·
 *   갈래 머리 = 부모 노면만큼 잘라 냄 · 뷰어 = B05 `createRouteViewer` · 닫으면 버림(WebGL 문맥까지) · 보기만(저장 없음).
 * ========================================================================== */

import "../B05_Profile/B05_Profile_UI_Style.css";
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 { buildCorridor } from "../B05_Profile/logic/B05_Profile_Corridor_Build";
import type { CorridorBuildResult } from "../B05_Profile/logic/B05_Profile_Corridor_Build";
import type { SectionStationMarker } from "../B05_Profile/B05_Profile_UI_Markers";
import { fetchSectionContext } from "../B06_Section/B06_Section_Api_Context";
import type { CrossSection } from "../B06_Section/B06_Section_Api_Types";
import type { Vertex } from "./logic/D03_PlanAnalysis_Plan";
import {
  branchTrimM,
  expectLine,
  expectSections,
  type ExpectStandard,
} from "./logic/D03_PlanAnalysis_Expect";

export interface Plan3dLine {
  name: string;
  line: Vertex[];
  /** 갈래(다른 선에 붙은 선) — 머리를 부모 노면만큼 잘라 지음. */
  branch: boolean;
}

/** 표준 횡단 기본값(config · 서버) — 못 받으면 null(선만). */
function loadExpectStandard(projectId: string): Promise<ExpectStandard | null> {
  return fetchSectionContext(projectId).then(
    (context) => ({
      standard: context.standard_cross_section as ExpectStandard["standard"],
      rockBoundaryM: context.rock_boundary_default_offset_m,
    }),
    () => null,
  );
}

/** 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[],
  intervalM: number,
): void {
  if (!lines.length) return void showToast("3D 로 볼 선이 없습니다.", "warning");
  let viewer: RouteViewer | null = createRouteViewer();
  const standard = loadExpectStandard(projectId);

  const load = async (): Promise<void> => {
    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> = { lines: lines.length, done: false };
    (window as unknown as { __d03Plan3d?: unknown }).__d03Plan3d = stat;
    try {
      const [std] = await Promise.all([
        standard,
        viewer.loadSurface(projectId, surface.modelId, "dtm", true, 5, gridBounds(surface.grid)),
      ]);
      if (!viewer) return;
      stat.surfaceMs = Math.round(performance.now() - started);
      viewer.markers.renderRoutes(lines.map((item) => item.line.map(([x, y]) => ({ x, y }))));
      const built = performance.now();
      const trim = std ? branchTrimM(std) : 0;
      const markers: SectionStationMarker[] = [];
      const builds: CorridorBuildResult[] = [];
      const perLine: Array<Record<string, unknown>> = [];
      lines.forEach((item, index) => {
        const plan = expectLine(item.line, item.branch ? trim : 0, intervalM);
        if (!plan) return;
        const ground = sectionsGround(plan.line, plan.stations, surface.grid);
        ground.stations.forEach((station, i) => {
          const chainage = (plan.stations[i] ?? station.chainage_m) + plan.offsetM;
          markers.push({
            station_id: `${index}:${chainage}`,
            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: chainage,
          });
        });
        if (!std) return;
        const sections = expectSections(
          ground.stations,
          std,
          surface.grid,
        ) as unknown as CrossSection[];
        const build = buildCorridor(
          sections,
          plan.line.map(([x, y]) => ({ x, y })),
        );
        if (build) {
          build.sections = sections; // 지형 잘림이 읽음
          builds.push(build);
        }
        perLine.push({
          name: item.name,
          branch: item.branch,
          offsetM: plan.offsetM,
          sections: sections.length,
          corridor: !!build,
          // 노면 중심(설계선 오프셋 0) − 측점 지반고
          centerDelta: sections.map((c) =>
            c.center_z === null ? null : (c.design?.design_elevation_m ?? NaN) - c.center_z,
          ),
        });
      });
      viewer.renderStationLines(markers, 2.5);
      viewer.setCorridors(builds);
      Object.assign(stat, {
        trimM: trim,
        corridors: builds.length,
        stations: markers.length,
        buildMs: Math.round(performance.now() - built),
        perLine,
      });
      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();
    }
  };

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