/* =============================================================================
 * E06_StabRock_UI_Stereonet.ts
 * E06 가운데 스테레오넷(SVG · 하반구) — 서버가 내려 준 투영 좌표(반지름 1 · x = 동 · y = 북)를
 *   그리기만 함(계산 = E06_StabRock_Stereonet.py). 보기 = 전체 · 평면 · 쐐기 · 전도.
 *   평면 · 전도 = 극점 + 극점 마찰원(φ) · 쐐기 = 교선 + 교선 마찰원 · 위험 영역 = 모드 색 ·
 *   일광 엔벨로프(평면) · 사면 대원 = 굵은 선. 위험 판정된 절리 · 교선 = 테두리 강조.
 * ========================================================================== */

import { el } from "@ui/ui_template_elements";
import { t, type LocaleKey } from "@ui/ui_template_locale";

const SVG_NS = "http://www.w3.org/2000/svg";
const SIZE = 440;
const R = 190;
const C = SIZE / 2;

export type NetMode = "all" | "planar" | "wedge" | "toppling";
type XY = [number, number];

export interface NetData {
  projection: string;
  slope: { pole: XY; great_circle: XY[] };
  planes: { id: string; pole: XY; great_circle: XY[] }[];
  intersections: { ids: [string, string]; point: XY }[];
  friction_pole_r: number;
  friction_line_r: number;
  daylight_envelope: XY[];
  zones: Record<"planar" | "wedge" | "toppling", XY[] | null>;
}

export interface NetMarks {
  planar: string[];
  toppling: string[];
  wedge: string[]; // "J1|J2"
}

function svg<K extends keyof SVGElementTagNameMap>(
  tag: K,
  attrs: Record<string, string | number> = {},
  text?: string,
): SVGElementTagNameMap[K] {
  const node = document.createElementNS(SVG_NS, tag);
  for (const [k, v] of Object.entries(attrs)) node.setAttribute(k, String(v));
  if (text !== undefined) node.textContent = text;
  return node;
}

const sx = (p: XY): number => C + R * p[0];
const sy = (p: XY): number => C - R * p[1];
const path = (pts: XY[], close = false): string =>
  pts.map((p, i) => `${i ? "L" : "M"}${sx(p).toFixed(1)},${sy(p).toFixed(1)}`).join("") +
  (close ? "Z" : "");

/** 절리 색 번호(0~5) — 표 · 그림 같은 차례 */
export const jointTone = (index: number): number => index % 6;

export function drawStereonet(net: NetData, mode: NetMode, marks: NetMarks): SVGSVGElement {
  const root = svg("svg", {
    viewBox: `0 0 ${SIZE} ${SIZE}`,
    class: "e06-net",
    "data-role": "stereonet",
    "data-projection": net.projection,
    "data-mode": mode,
  });
  const clip = svg("clipPath", { id: "e06-net-clip" });
  clip.append(svg("circle", { cx: C, cy: C, r: R }));
  const defs = svg("defs");
  defs.append(clip);
  root.append(defs, svg("circle", { cx: C, cy: C, r: R, class: "e06-net__rim" }));
  const body = svg("g", { "clip-path": "url(#e06-net-clip)" });
  root.append(body);

  const show = (m: Exclude<NetMode, "all">): boolean => mode === "all" || mode === m;
  for (const m of ["planar", "wedge", "toppling"] as const) {
    const zone = net.zones[m];
    if (zone && show(m))
      body.append(
        svg("path", {
          d: path(zone, true),
          class: `e06-net__zone e06-net__zone--${m}`,
          "data-zone": m,
        }),
      );
  }
  // 마찰원
  if (show("planar") || show("toppling"))
    body.append(
      svg("circle", {
        cx: C,
        cy: C,
        r: R * net.friction_pole_r,
        class: "e06-net__friction",
        "data-role": "friction-pole",
      }),
    );
  if (show("wedge"))
    body.append(
      svg("circle", {
        cx: C,
        cy: C,
        r: R * net.friction_line_r,
        class: "e06-net__friction e06-net__friction--line",
        "data-role": "friction-line",
      }),
    );
  if (show("planar"))
    body.append(
      svg("path", {
        d: path(net.daylight_envelope),
        class: "e06-net__envelope",
        "data-role": "daylight",
      }),
    );
  // 대원
  net.planes.forEach((p, i) =>
    body.append(
      svg("path", {
        d: path(p.great_circle),
        class: `e06-net__gc e06-tone-${jointTone(i)}`,
        "data-id": p.id,
      }),
    ),
  );
  body.append(
    svg("path", { d: path(net.slope.great_circle), class: "e06-net__slope", "data-role": "slope" }),
  );

  // 극점(평면 · 전도 보기) · 교선(쐐기 보기)
  if (mode !== "wedge")
    net.planes.forEach((p, i) => {
      const risky = marks.planar.includes(p.id) || marks.toppling.includes(p.id);
      const g = svg("g", {
        class: `e06-net__pole e06-tone-${jointTone(i)}${risky ? " is-risk" : ""}`,
        "data-pole": p.id,
      });
      g.append(svg("circle", { cx: sx(p.pole), cy: sy(p.pole), r: 5 }));
      g.append(svg("text", { x: sx(p.pole) + 7, y: sy(p.pole) - 6 }, p.id));
      root.append(g);
    });
  if (mode === "all" || mode === "wedge")
    for (const line of net.intersections) {
      const key = line.ids.join("|");
      const risky = marks.wedge.includes(key);
      const [x, y] = [sx(line.point), sy(line.point)];
      const g = svg("g", { class: `e06-net__line${risky ? " is-risk" : ""}`, "data-line": key });
      g.append(svg("path", { d: `M${x},${y - 6}L${x + 5.5},${y + 4}L${x - 5.5},${y + 4}Z` }));
      g.append(svg("text", { x: x + 7, y: y + 12 }, line.ids.join("·")));
      root.append(g);
    }
  // 사면 극점 · 방위
  root.append(
    svg("rect", {
      x: sx(net.slope.pole) - 4,
      y: sy(net.slope.pole) - 4,
      width: 8,
      height: 8,
      class: "e06-net__slope-pole",
    }),
  );
  for (const [label, x, y] of [
    ["N", C, C - R - 8],
    ["E", C + R + 10, C + 4],
    ["S", C, C + R + 18],
    ["W", C - R - 10, C + 4],
  ] as const)
    root.append(svg("text", { x, y, class: "e06-net__dir", "text-anchor": "middle" }, label));
  root.append(svg("line", { x1: C - 6, y1: C, x2: C + 6, y2: C, class: "e06-net__tick" }));
  root.append(svg("line", { x1: C, y1: C - 6, x2: C, y2: C + 6, class: "e06-net__tick" }));
  return root;
}

export function netLegend(mode: NetMode): HTMLElement {
  const box = el("div", { className: "e06-legend" });
  const items: [string, LocaleKey][] = [
    ["slope", "E06_Lg_Slope"],
    ["friction", "E06_Lg_Friction"],
  ];
  if (mode === "all" || mode === "planar")
    items.push(["planar", "E06_Lg_Planar"], ["daylight", "E06_Lg_Daylight"]);
  if (mode === "all" || mode === "wedge")
    items.push(["wedge", "E06_Lg_Wedge"], ["line", "E06_Lg_Line"]);
  if (mode === "all" || mode === "toppling") items.push(["toppling", "E06_Lg_Toppling"]);
  if (mode !== "wedge") items.push(["pole", "E06_Lg_Pole"]);
  for (const [cls, key] of items) {
    const row = el("span", { className: "e06-legend__row" });
    row.append(
      el("i", { className: `e06-legend__mark e06-legend__mark--${cls}` }),
      el("span", { text: t(key) }),
    );
    box.append(row);
  }
  return box;
}