/* =============================================================================
 * E02_StabGround_UI_Water.ts
 * E02 지하수 카드(요구 347 · 351 · PLAN 532-3) — 건기 규칙 · 우기 갈래 넷(KDS 기본 · 지표 아래 깊이 비율 ·
 *   r_u · 사용자 수위선 구간) · 「KDS 기본 · 우기 기준안전율 1.2 와 짝」 안내 · [기본값].
 *   엔진 꼴로 바꾸기는 서버(`E02_StabGround_Model.station_groundwater`) — 여기는 값만 고침.
 * ========================================================================== */

import { createButton, el } from "@ui/ui_template_elements";
import { t, type LocaleKey } from "@ui/ui_template_locale";
import { WATER_KEYS, WATER_RULES, WET_MODES, type WetMode } from "./logic/E02_StabGround_Check";
import {
  card,
  clone,
  headButtons,
  numInput,
  selectInput,
  table,
  type E02View,
} from "./E02_StabGround_UI_Tables";

const L = (key: string): string => t(key as LocaleKey);

function field(label: string, input: HTMLElement): HTMLElement {
  const node = el("label", { className: "e02-field" });
  node.append(el("span", { text: label }), input);
  return node;
}

function removeButton(view: E02View, onClick: () => void): HTMLButtonElement {
  const button = createButton({
    label: t("E02_Btn_Remove"),
    variant: "danger-ghost",
    size: "sm",
    onClick,
  });
  button.hidden = !view.editable;
  return button;
}

/** 사용자 수위선 구간 표 — 줄마다 시작 · 끝 · 점(offset · 깊이) · [점 추가] · [지움] */
function linesBody(view: E02View): HTMLElement {
  const water = view.ground.groundwater;
  if (!water.lines.length) return el("p", { className: "e02-empty", text: t("E02_Line_Empty") });
  const rows = water.lines.map((line, i) => {
    const base = `groundwater.lines.${i}`;
    const points = el("div", { className: "e02-points" });
    points.dataset.path = `${base}.points`;
    line.points.forEach((point, k) => {
      const pair = el("span", { className: "e02-point" });
      pair.append(
        numInput(view, `${base}.points.${k}.0`, point[0], (v) => (point[0] = v as number)),
        numInput(view, `${base}.points.${k}.1`, point[1], (v) => (point[1] = v as number)),
        removeButton(view, () => {
          line.points.splice(k, 1);
          view.rebuild();
        }),
      );
      points.append(pair);
    });
    const addPoint = createButton({
      label: t("E02_Btn_AddPoint"),
      variant: "ghost",
      size: "sm",
      onClick: () => {
        const last = line.points[line.points.length - 1];
        line.points.push(last ? [last[0] + 5, last[1]] : [0, 1]);
        view.rebuild();
      },
    });
    addPoint.hidden = !view.editable;
    points.append(addPoint);
    return [
      numInput(view, `${base}.from_m`, line.from_m, (v) => (line.from_m = v as number)),
      numInput(view, `${base}.to_m`, line.to_m, (v) => (line.to_m = v as number)),
      points,
      removeButton(view, () => {
        water.lines.splice(i, 1);
        view.rebuild();
      }),
    ];
  });
  return table([t("E02_Col_From"), t("E02_Col_To"), t("E02_Col_Points"), ""], rows);
}

export function waterCard(view: E02View): HTMLElement {
  const water = view.ground.groundwater;
  const d = view.defaults.groundwater;
  const rule = (key: (typeof WATER_KEYS)[number]): HTMLElement =>
    field(
      L(`E02_Water_${key}`),
      selectInput(
        view,
        `groundwater.${key}`,
        WATER_RULES.map((r) => ({ value: r, text: L(`E02_Rule_${r}`) })),
        water[key],
        (v) => (water[key] = v as (typeof WATER_RULES)[number]),
        { src: `groundwater.${key}`, def: L(`E02_Rule_${d[key]}`) },
      ),
    );
  const mode = selectInput(
    view,
    "groundwater.wet_mode",
    WET_MODES.map((m) => ({ value: m, text: L(`E02_WetMode_${m}`) })),
    water.wet_mode,
    (v) => {
      water.wet_mode = v as WetMode;
      view.rebuild();
    },
    { src: "groundwater.wet_mode", def: L(`E02_WetMode_${d.wet_mode}`) },
  );
  const grid = el("div", { className: "e02-grid" });
  grid.append(rule("dry"), field(t("E02_WetMode"), mode));
  const body: HTMLElement[] = [];
  if (water.wet_mode === "kds") grid.append(rule("wet_soil"), rule("wet_rock"));
  if (water.wet_mode === "depth_ratio")
    grid.append(
      field(
        t("E02_DepthRatio"),
        numInput(
          view,
          "groundwater.depth_ratio",
          water.depth_ratio,
          (v) => (water.depth_ratio = v as number),
          { src: "groundwater.depth_ratio", def: d.depth_ratio },
        ),
      ),
    );
  if (water.wet_mode === "ru")
    grid.append(
      field(
        t("E02_Ru"),
        numInput(view, "groundwater.ru", water.ru, (v) => (water.ru = v as number), {
          src: "groundwater.ru",
          def: d.ru,
        }),
      ),
    );
  if (water.wet_mode === "line")
    body.push(el("p", { className: "e02-hint", text: t("E02_Line_Hint") }), linesBody(view));

  const { section, head } = card(
    "E02_Card_Water",
    el("p", { className: "e02-hint", text: t("E02_Water_Hint") }),
    grid,
    ...body,
  );
  const stations = view.ground.stations;
  const first = stations[0]?.chainage_m ?? 0;
  const last = stations[stations.length - 1]?.chainage_m ?? 100;
  const buttons = [
    createButton({
      label: t("E02_Btn_Defaults"),
      variant: "ghost",
      size: "sm",
      onClick: () => {
        view.ground.groundwater = clone(d);
        view.rebuild();
      },
    }),
  ];
  if (water.wet_mode === "line")
    buttons.unshift(
      createButton({
        label: t("E02_Btn_AddLine"),
        variant: "ghost",
        size: "sm",
        onClick: () => {
          water.lines.push({
            from_m: first,
            to_m: last > first ? last : first + 20,
            points: [
              [-10, 1],
              [10, 1],
            ],
          });
          view.rebuild();
        },
      }),
    );
  headButtons(view, head, ...buttons);
  return section;
}