/* =============================================================================
 * E03_StabSection_UI_Result.ts
 * E03 우측 결과(PLAN 532-3) — 안전율 · 기준 · 판정 · 방법 · 수렴 · 중심/반경 · 방법별 최소 안전율 ·
 *   절편표(누르면 고름) · 절편 자유물체도(고른 절편 힘 화살) · 절편력 그래프(바닥 유효 수직응력 ·
 *   간극수압 · 동원 전단응력 — kPa 한 축). 계산은 logic.
 * ========================================================================== */

import { createBadge } from "@ui/ui_template_badge";
import { el } from "@ui/ui_template_elements";
import { createKv, type KvRow } from "@ui/ui_template_kv";
import { t, type LocaleKey } from "@ui/ui_template_locale";
import {
  forceArrows,
  niceTicks,
  pointsText,
  sliceShape,
  sliceStress,
  type Analysis,
  type Point,
  type SectionView,
  type SideCase,
} from "./logic/E03_StabSection_Logic";
import { WALL_ID, materialClass, svgEl } from "./E03_StabSection_UI_Section";
import { card, emptyBox, legend, muted } from "./E03_StabSection_UI_Parts";
import { e03Table } from "./E03_StabSection_UI_Table";

const fmt = (v: number | null | undefined, d = 2): string =>
  v === null || v === undefined || !Number.isFinite(v) ? "-" : v.toFixed(d);

const METHODS = ["ordinary", "bishop", "janbu", "spencer"] as const;

export function verdictChip(ok: boolean | null): HTMLElement {
  const v = ok === null ? "none" : ok ? "ok" : "ng";
  const chip = createBadge(
    t(`E03_Verdict_${v}` as LocaleKey),
    v === "ok" ? "success" : v === "ng" ? "danger" : "neutral",
    { kind: "lamp" },
  );
  chip.classList.add("e03-verdict", `e03-verdict--${v}`);
  return chip;
}

function flag(textKey: LocaleKey, hintKey: LocaleKey, role: string, hint?: string): HTMLElement {
  const badge = createBadge(t(textKey), "warning", { size: 18 });
  badge.title = hint ?? t(hintKey);
  badge.dataset.role = role;
  return badge;
}

function kpi(analysis: Analysis, walls: number, basis?: SideCase): HTMLElement {
  const c = analysis.critical;
  const method = (basis?.method || "bishop") as string;
  const rows: KvRow[] = [
    { label: t("E03_Fs"), value: fmt(c?.fs, 3), big: true },
    { label: t("E03_Verdict"), value: verdictChip(analysis.ok) },
    { label: t("E03_Required"), value: fmt(analysis.required) },
    {
      label: t("E03_Method"),
      value: `${t(`E03_Method_${method}` as LocaleKey)} · ${c?.kind === "circle" ? t("E03_Circle") : t("E03_NonCircle")}`,
    },
    {
      label: t("E03_Converged"),
      value: c
        ? `${c.converged ? t("E03_Yes") : t("E03_No")} · ${c.iterations ?? "-"}${t("E03_Iter")}`
        : "-",
    },
    { label: t("E03_Height"), value: `${fmt(analysis.height_m)} m` },
  ];
  if (analysis.surface_check) {
    const circular = basis?.fs_circular;
    const hint = `${t("E03_SurfaceCheck_Hint")}${circular != null ? ` · ${t("E03_Method_bishop")} ${fmt(circular, 3)}` : ""}`;
    rows.push({
      label: t("E03_Col_Basis"),
      value: flag("E03_SurfaceCheck", "E03_SurfaceCheck_Hint", "surface-check", hint),
    });
  }
  if (analysis.edge)
    rows.push({
      label: t("E03_Col_Basis"),
      value: flag("E03_EdgeSurface", "E03_EdgeSurface_Hint", "edge-surface"),
    });
  if (walls)
    rows.push({
      label: t("E03_Walls"),
      value: el("span", { text: String(walls), attrs: { "data-role": "walls" } }),
    });
  if (c?.center) {
    rows.push({ label: t("E03_Center"), value: `${fmt(c.center[0])}, ${fmt(c.center[1])}` });
    rows.push({ label: t("E03_Radius"), value: `${fmt(c.radius)} m` });
  }
  const dl = createKv(rows);
  dl.classList.add("e03-kpi");
  return dl;
}

function methodTable(analysis: Analysis): HTMLElement {
  return e03Table(
    METHODS.map((m) => ({ label: t(`E03_Method_${m}` as LocaleKey), num: true })),
    [
      METHODS.map((m) => {
        const v = analysis.min_by_method[m];
        const unsolved = (v === null || v === undefined) && analysis.no_solution?.includes(m);
        return unsolved ? t("E03_NoSolution") : fmt(v, 3);
      }),
    ],
    "methods",
  ).root;
}

function sliceTable(
  analysis: Analysis,
  picked: number | null,
  onPick: (i: number | null) => void,
): HTMLElement {
  const wrap = el("div", { className: "e03-slices" });
  const cols: [LocaleKey, (s: Analysis["slices"][number]) => string][] = [
    ["E03_Col_No", (s) => String(s.i)],
    ["E03_Col_Width", (s) => fmt(s.width)],
    ["E03_Col_Height", (s) => fmt(s.height)],
    ["E03_Col_Alpha", (s) => fmt(s.alpha_deg, 1)],
    ["E03_Col_W", (s) => fmt(s.weight + s.surcharge, 1)],
    ["E03_Col_U", (s) => fmt(s.pore_pressure, 1)],
    ["E03_Col_N", (s) => fmt(s.N_eff, 1)],
    ["E03_Col_S", (s) => fmt(s.S, 1)],
    ["E03_Col_C", (s) => fmt(s.c, 0)],
    ["E03_Col_Phi", (s) => fmt(s.phi_deg, 0)],
  ];
  const slices = e03Table(
    cols.map(([k]) => ({ label: t(k), num: true })),
    analysis.slices.map((s) => cols.map(([, f]) => f(s))),
    "slice-table",
  );
  slices.rows.forEach((tr, i) => {
    tr.dataset.i = String(i);
    tr.classList.toggle("is-picked", picked === i);
    tr.classList.toggle("is-active", picked === i);
    tr.addEventListener("click", () => onPick(picked === i ? null : i));
  });
  wrap.append(slices.root);
  if (picked !== null)
    queueMicrotask(() => slices.rows[picked]?.scrollIntoView({ block: "nearest" }));
  return wrap;
}

/** 자유물체도 — 고른 절편을 판에 맞춰 키우고 힘 화살(길이 = 힘 비례) · 값 글 */
function freeBody(view: SectionView, analysis: Analysis, picked: number | null): HTMLElement {
  const box = el("div", { className: "e03-fbd" });
  const slice = picked !== null ? analysis.slices[picked] : null;
  if (!slice || !analysis.critical) {
    box.append(muted(t("E03_PickSlice")));
    return box;
  }
  const W = 380;
  const H = 260;
  const shape = sliceShape(slice, view.surface, analysis.critical.points);
  const xs = shape.map((p) => p[0]);
  const zs = shape.map((p) => p[1]);
  const span = Math.max(Math.max(...xs) - Math.min(...xs), Math.max(...zs) - Math.min(...zs), 0.01);
  const k = 90 / span; // 절편 = 약 90 px
  const cx = (Math.min(...xs) + Math.max(...xs)) / 2;
  const cz = (Math.min(...zs) + Math.max(...zs)) / 2;
  // 화면 = 횡단과 같은 방향(좌측 +offset 이 왼쪽)
  const scr = (p: Point): Point => [W / 2 - k * (p[0] - cx), H / 2 - k * (p[1] - cz)];
  const forces = [slice.weight, slice.surcharge, slice.N_eff, slice.U, slice.S].concat(
    [slice.E_left, slice.E_right, slice.X_left, slice.X_right].map(Math.abs),
  );
  const maxF = Math.max(...forces, 1e-6);
  const lengthPerKn = 80 / k / maxF; // 가장 큰 힘 = 80 px
  const svg = svgEl("svg", { viewBox: `0 0 ${W} ${H}`, "data-role": "fbd" });
  const defs = svgEl("defs");
  const marker = svgEl("marker", {
    id: "e03-head",
    viewBox: "0 0 10 10",
    refX: 9,
    refY: 5,
    markerWidth: 7,
    markerHeight: 7,
    orient: "auto-start-reverse",
  });
  marker.append(svgEl("path", { d: "M0,0 L10,5 L0,10 z", fill: "context-stroke" }));
  defs.append(marker);
  svg.append(defs);
  svg.append(
    svgEl("polygon", {
      points: shape.map((p) => scr(p).join(",")).join(" "),
      class: `e03-region ${materialClass(view, slice.material ?? "")}`,
    }),
  );
  for (const a of forceArrows(slice, shape, analysis.direction, lengthPerKn)) {
    const [p0, p1] = [scr(a.from), scr(a.to)];
    svg.append(
      svgEl("line", {
        x1: p0[0],
        y1: p0[1],
        x2: p1[0],
        y2: p1[1],
        class: `e03-arrow e03-arrow--${a.name}`,
        "marker-end": "url(#e03-head)",
        "data-force": a.name,
        "data-value": String(a.value),
      }),
    );
    // 글 = 화살 바깥 끝(들어오는 힘 = 꼬리 · 나가는 힘 = 머리)에서 화살 방향으로 조금 더
    const len = Math.hypot(p1[0] - p0[0], p1[1] - p0[1]) || 1;
    const d: Point = [(p1[0] - p0[0]) / len, (p1[1] - p0[1]) / len];
    const ending = a.name !== "W";
    const out: Point = ending ? [-d[0], -d[1]] : d;
    const at: Point = ending ? p0 : p1;
    const anchor = out[0] > 0.3 ? "start" : out[0] < -0.3 ? "end" : "middle";
    const label = { x: at[0] + out[0] * 6, y: at[1] + out[1] * 6 + (out[1] > 0.3 ? 10 : 0) };
    svg.append(
      svgEl(
        "text",
        { ...label, "text-anchor": anchor, class: "e03-label" },
        `${a.name} ${fmt(a.value, 1)}`,
      ),
    );
  }
  box.append(svg);
  box.append(
    muted(
      `#${slice.i} · α ${fmt(slice.alpha_deg, 1)}° · b ${fmt(slice.width)} m · ${t("E03_FbdUnit")}`,
    ),
  );
  return box;
}

/** 절편력 그래프 — x = 절편 가운데(횡단과 같은 방향) · y = kPa(한 축) · 고른 절편 세로선 */
function stressGraph(analysis: Analysis, picked: number | null): HTMLElement {
  const box = el("div", { className: "e03-graph" });
  const rows = sliceStress(analysis.slices);
  if (!rows.length) return box;
  const W = 380;
  const H = 200;
  const pad = { l: 44, r: 10, t: 10, b: 26 };
  const xs = rows.map((r) => r.x);
  const values = rows.flatMap((r) => [r.sigma, r.u, r.tau]);
  const ticks = niceTicks(Math.min(...values), Math.max(...values), 4);
  const [y0, y1] = [ticks[0], ticks[ticks.length - 1]];
  const [x0, x1] = [Math.min(...xs), Math.max(...xs)];
  const sx = (x: number): number =>
    pad.l + ((x1 - x) / Math.max(x1 - x0, 1e-6)) * (W - pad.l - pad.r);
  const sy = (y: number): number =>
    H - pad.b - ((y - y0) / Math.max(y1 - y0, 1e-6)) * (H - pad.t - pad.b);
  const svg = svgEl("svg", { viewBox: `0 0 ${W} ${H}`, "data-role": "stress-graph" });
  const axis = svgEl("g", { class: "e03-axis" });
  for (const v of ticks) {
    axis.append(svgEl("line", { x1: pad.l, x2: W - pad.r, y1: sy(v), y2: sy(v) }));
    axis.append(svgEl("text", { x: pad.l - 4, y: sy(v) + 4, "text-anchor": "end" }, String(v)));
  }
  axis.append(svgEl("text", { x: pad.l, y: H - 6 }, `${fmt(x1, 1)} m`));
  axis.append(svgEl("text", { x: W - pad.r, y: H - 6, "text-anchor": "end" }, `${fmt(x0, 1)} m`));
  axis.append(svgEl("text", { x: W / 2, y: H - 6, "text-anchor": "middle" }, t("E03_Offset")));
  svg.append(axis);
  if (picked !== null && rows[picked]) {
    const x = sx(rows[picked].x);
    svg.append(svgEl("line", { x1: x, x2: x, y1: pad.t, y2: H - pad.b, class: "e03-radius" }));
  }
  for (const key of ["sigma", "u", "tau"] as const) {
    const pts: Point[] = rows.map((r) => [sx(r.x), sy(r[key])]);
    svg.append(svgEl("polyline", { points: pointsText(pts), class: `e03-line e03-line--${key}` }));
  }
  // 가는 기둥마다 툴팁(절편 번호 · 세 값)
  rows.forEach((r, i) => {
    const w = (W - pad.l - pad.r) / rows.length;
    const hit = svgEl("rect", {
      x: sx(r.x) - w / 2,
      y: pad.t,
      width: w,
      height: H - pad.t - pad.b,
      fill: "transparent",
    });
    hit.append(
      svgEl(
        "title",
        {},
        `#${i + 1} · σ' ${fmt(r.sigma, 1)} · u ${fmt(r.u, 1)} · τ ${fmt(r.tau, 1)} kPa`,
      ),
    );
    svg.append(hit);
  });
  box.append(svg);
  box.append(
    legend([
      { label: t("E03_Graph_Sigma"), color: "var(--e03-mat-0)", kind: "line" },
      { label: t("E03_Graph_U"), color: "var(--e03-water)", kind: "dash" },
      { label: t("E03_Graph_Tau"), color: "var(--e03-mat-1)", kind: "line" },
    ]),
  );
  return box;
}

export function buildResult(
  view: SectionView,
  analysis: Analysis | null,
  picked: number | null,
  onPick: (i: number | null) => void,
  basis?: SideCase,
): HTMLElement {
  const root = card("e03-result");
  if (!analysis || !analysis.critical) {
    root.append(emptyBox(t("E03_NoSurface")));
    return root;
  }
  const head = (key: LocaleKey): HTMLElement =>
    el("h3", { className: "e03-card__title", text: t(key) });
  const walls = view.regions.filter((r) => r.material_id === WALL_ID).length;
  root.append(head("E03_Result"), kpi(analysis, walls, basis), methodTable(analysis));
  root.append(head("E03_Slices"), sliceTable(analysis, picked, onPick));
  root.append(head("E03_Fbd"), freeBody(view, analysis, picked));
  root.append(head("E03_Graph"), stressGraph(analysis, picked));
  return root;
}