/* =============================================================================
 * E03_StabSection_UI_Reinforce.ts
 * E03 「보강 검토」 탭(PLAN 536-3) — 고른 측점 비탈 가정(1:n 완화 · 소단 폭 · 높이 · 최소 완화 찾기)
 *   → 서버 재해석(POST …/stab/whatif/{측점}) · 전후 안전율 · 판정 표 · 후 단면 그림 ·
 *   벽 있는 측점 = 벽 외적 안정 표(POST …/stab/wallcheck/{측점} · 활동 · 전도 · 지지력).
 *   가정은 형상만 바꾼 따로 저장본(원본 결과 그대로) · 계산은 서버.
 * ========================================================================== */

import { createButton, createInputField, createSelectField, el } from "@ui/ui_template_elements";
import { t, type LocaleKey } from "@ui/ui_template_locale";
import { createSectionCanvas } from "./E03_StabSection_UI_Section";
import { verdictChip } from "./E03_StabSection_UI_Result";
import type { Condition, SectionView, SideCase, StationRow } from "./logic/E03_StabSection_Logic";

export interface WhatIfRecord {
  type: "slope";
  station_key: string;
  assume: {
    side: string;
    role: "cut" | "fill";
    ratio: number;
    ratio_before: number;
    bench_w: number;
    bench_h: number;
  };
  search: {
    found: number | null;
    gentlest: number;
    tried: [number, boolean][];
    condition: Condition | null;
  } | null;
  before: Partial<Record<Condition, SideCase>>;
  after: Partial<Record<Condition, SideCase>>;
  elapsed_s: number;
  view: SectionView;
}

type Check = "sliding" | "overturning" | "bearing";
interface WallCase {
  case: "normal" | "seismic";
  fs: Record<Check, number>;
  required: Record<Check, number>;
  ok: Record<Check, boolean>;
  coefficients: { ka: number; kae: number | null };
  base: { e: number; q_max: number; q_ult: number };
  geometry: { H: number; B: number };
}
export interface WallRecord {
  type: "wall";
  params: { method: string; water_ratio: number; kh: number };
  walls: { name: string | null; side: string; role: string; cases: WallCase[] }[];
}

export interface SlopeAsk {
  side: string;
  ratio: number | null;
  bench_w: number;
  bench_h: number;
  search: boolean;
  /** 최소 완화 찾기 목표 조건(그 조건 기준안전율) */
  condition: Condition | null;
}
export interface WallAsk {
  method: string;
  water_ratio: number;
}

export interface ReinforceOptions {
  row: StationRow;
  condition: Condition;
  side: string | null;
  editable: boolean;
  busy: boolean;
  slope: WhatIfRecord | undefined;
  wall: WallRecord | undefined;
  runSlope: (ask: SlopeAsk) => void;
  runWall: (ask: WallAsk) => void;
}

const fmt = (v: number | null | undefined, d = 2): string =>
  v === null || v === undefined || !Number.isFinite(v) ? "-" : v.toFixed(d);
const CONDS: Condition[] = ["dry", "wet", "seismic"];
const CHECKS: Check[] = ["sliding", "overturning", "bearing"];

function num(input: HTMLInputElement): number | null {
  const v = Number(input.value);
  return input.value.trim() === "" || !Number.isFinite(v) ? null : v;
}

/** 전후 안전율 · 판정 표 — 비탈 가정 · 네일 · 앵커 가정 같이 씀 */
export function slopeTable(rec: Pick<WhatIfRecord, "before" | "after">): HTMLElement {
  const table = el("table", { className: "e03-table", attrs: { "data-role": "whatif-table" } });
  const head = ["E03_Condition", "E03_Rf_Before", "E03_Rf_After", "E03_Required"] as LocaleKey[];
  table.append(
    el("thead", {
      children: [
        el("tr", {
          children: [
            ...head.map((k, i) => el("th", { className: i ? "is-num" : "", text: t(k) })),
            el("th", { text: t("E03_Rf_VerdictBefore") }),
            el("th", { text: t("E03_Rf_VerdictAfter") }),
          ],
        }),
      ],
    }),
  );
  const body = el("tbody");
  for (const cond of CONDS) {
    const a = rec.after[cond];
    if (!a) continue;
    const b = rec.before[cond];
    const tr = el("tr", { attrs: { "data-cond": cond } });
    tr.append(
      el("td", { text: t(`E03_Cond_${cond}` as LocaleKey) }),
      el("td", { className: "is-num", text: fmt(b?.fs, 3) }),
      el("td", { className: "is-num", text: fmt(a.fs, 3), attrs: { "data-role": "fs-after" } }),
      el("td", { className: "is-num", text: fmt(a.required) }),
      el("td", { children: [verdictChip(b?.ok ?? null)] }),
      el("td", { children: [verdictChip(a.ok)] }),
    );
    body.append(tr);
  }
  table.append(body);
  return table;
}

function assumeText(rec: WhatIfRecord): string {
  const a = rec.assume;
  let text = `1:${a.ratio_before} → 1:${a.ratio}`;
  if (a.bench_w && a.bench_h) text += ` · ${t("E03_Rf_Bench")} ${a.bench_w} m / ${a.bench_h} m`;
  if (rec.search)
    text += rec.search.found
      ? ` · ${t("E03_Rf_Found")} (${rec.search.tried.length}${t("E03_Iter")})`
      : ` · ${t("E03_Rf_NotFound").replace("{n}", String(rec.search.gentlest))}`;
  return `${text} · ${rec.elapsed_s} s`;
}

function wallTable(rec: WallRecord): HTMLElement {
  const box = el("div", { attrs: { "data-role": "wall-table" } });
  for (const wall of rec.walls) {
    for (const c of wall.cases) {
      box.append(
        el("p", {
          className: "e03-muted",
          text:
            `${wall.name ?? t("E03_Rf_Wall")} · ${t(`E03_Rf_Case_${c.case}` as LocaleKey)} · ` +
            `H ${fmt(c.geometry.H)} m · B ${fmt(c.geometry.B)} m · Ka ${fmt(c.coefficients.ka, 3)}` +
            (c.coefficients.kae ? ` · KAE ${fmt(c.coefficients.kae, 3)}` : "") +
            ` · e ${fmt(c.base.e)} m · q_max ${fmt(c.base.q_max, 1)} kPa`,
        }),
      );
      const table = el("table", { className: "e03-table" });
      table.append(
        el("thead", {
          children: [
            el("tr", {
              children: [
                el("th", { text: t("E03_Rf_Check") }),
                el("th", { className: "is-num", text: t("E03_Rf_Fs") }),
                el("th", { className: "is-num", text: t("E03_Required") }),
                el("th", { text: t("E03_Verdict") }),
              ],
            }),
          ],
        }),
      );
      const body = el("tbody");
      for (const k of CHECKS)
        body.append(
          el("tr", {
            attrs: { "data-check": k, "data-case": c.case },
            children: [
              el("td", { text: t(`E03_Rf_${k}` as LocaleKey) }),
              el("td", { className: "is-num", text: fmt(c.fs[k]) }),
              el("td", { className: "is-num", text: fmt(c.required[k], 1) }),
              el("td", { children: [verdictChip(c.ok[k])] }),
            ],
          }),
        );
      table.append(body);
      box.append(table);
    }
  }
  return box;
}

export function buildReinforce(o: ReinforceOptions): HTMLElement {
  const host = el("div", { className: "e03-card", attrs: { "data-role": "reinforce" } });
  const sides = o.row.sides;
  const sideField = createSelectField({
    label: t("E03_Side"),
    options: sides.map((s) => ({
      value: s.side,
      text: `${t(s.side === "left" ? "E03_Left" : "E03_Right")} · ${t(s.role === "cut" ? "E03_Cut" : "E03_Fill")}`,
    })),
    value: o.slope?.assume.side ?? o.side ?? undefined,
    compact: true,
  });
  const ratio = createInputField({
    label: t("E03_Rf_Ratio"),
    type: "number",
    min: 0.1,
    max: 4,
    compact: true,
    value: o.slope ? String(o.slope.assume.ratio) : "",
    placeholder: t("E03_Rf_RatioNow"),
  });
  const benchW = createInputField({
    label: t("E03_Rf_BenchW"),
    type: "number",
    min: 0,
    compact: true,
    value: o.slope?.assume.bench_w ? String(o.slope.assume.bench_w) : "",
  });
  const benchH = createInputField({
    label: t("E03_Rf_BenchH"),
    type: "number",
    min: 0,
    compact: true,
    value: o.slope?.assume.bench_h ? String(o.slope.assume.bench_h) : "",
  });
  for (const f of [ratio, benchW, benchH]) f.input.step = "0.05";
  const ask = (search: boolean): SlopeAsk => ({
    side: sideField.select.value,
    ratio: search ? null : num(ratio.input),
    bench_w: num(benchW.input) ?? 0,
    bench_h: num(benchH.input) ?? 0,
    search,
    condition: search ? o.condition : null,
  });
  const run = createButton({
    label: o.busy ? t("E03_Rf_Busy") : t("E03_Rf_Run"),
    variant: "filled",
    onClick: () => o.runSlope(ask(false)),
  });
  const find = createButton({
    label: t("E03_Rf_Search"),
    variant: "ghost",
    onClick: () => o.runSlope(ask(true)),
  });
  run.disabled = find.disabled = o.busy || !o.editable;
  run.dataset.role = "whatif-run";
  find.dataset.role = "whatif-search";
  const fields = el("div", { className: "e03-panel__row" });
  fields.append(sideField.root, ratio.root, benchW.root, benchH.root);
  const buttons = el("div", { className: "e03-panel__row" });
  buttons.append(find, run);
  host.append(
    el("h3", { className: "e03-card__title", text: t("E03_Rf_Title") }),
    el("p", { className: "e03-muted", text: t("E03_Rf_Hint") }),
    el("p", {
      className: "e03-muted",
      text: t("E03_Rf_Goal").replace("{c}", t(`E03_Cond_${o.condition}` as LocaleKey)),
    }),
    fields,
    buttons,
  );
  if (o.slope) {
    host.append(
      el("p", {
        className: "e03-muted",
        text: assumeText(o.slope),
        attrs: { "data-role": "assume" },
      }),
      slopeTable(o.slope),
      el("h4", { className: "e03-card__title", text: t("E03_Rf_AfterSection") }),
    );
    const canvas = createSectionCanvas(() => undefined);
    canvas.root.style.height = "260px";
    canvas.root.style.flex = "none";
    canvas.root.dataset.role = "whatif-section";
    host.append(canvas.root);
    const analyses = o.slope.view.analyses.filter((a) => a.condition === o.condition);
    const analysis = analyses.find((a) => a.side === o.slope!.assume.side) ?? analyses[0] ?? null;
    const draw = {
      view: o.slope.view,
      analysis,
      toggles: { map: false, centers: false, candidates: false },
      picked: null,
    };
    canvas.render(draw); // 붙기 전 = 기본 폭 · 붙으면 ResizeObserver 가 다시 그림
  }
  if (o.row.walls) {
    const method = createSelectField({
      label: t("E03_Rf_Method"),
      options: [
        { value: "coulomb", text: "Coulomb" },
        { value: "rankine", text: "Rankine" },
      ],
      value: o.wall?.params.method,
      compact: true,
    });
    const water = createInputField({
      label: t("E03_Rf_Water"),
      type: "number",
      min: 0,
      max: 1,
      compact: true,
      value: String(o.wall?.params.water_ratio ?? 0),
    });
    water.input.step = "0.1";
    const check = createButton({
      label: t("E03_Rf_WallRun"),
      variant: "ghost",
      onClick: () => o.runWall({ method: method.select.value, water_ratio: num(water.input) ?? 0 }),
    });
    check.disabled = o.busy || !o.editable;
    check.dataset.role = "wall-run";
    const row = el("div", { className: "e03-panel__row" });
    row.append(method.root, water.root, check);
    host.append(el("h3", { className: "e03-card__title", text: t("E03_Rf_WallTitle") }), row);
    if (o.wall) host.append(wallTable(o.wall));
  }
  return host;
}