/* =============================================================================
 * M02_MasterTemplete_Options.ts
 * 좌측 「구조물 옵션 보이기」 줄(구조물 집계 양식 아래 별도) — 누르면 메인 칸에
 * 종류 목록(군별) → 고른 종류의 옵션 체크 목록(라벨 · 키 작은 글 · B06 전용 · 필수 표시) ·
 * [저장] · [모두 보임]. 체크 안 한 옵션은 B05 · B06 구조물 폼에서 숨음(정의 · 값은 그대로).
 * 서버 = `M02_MasterTemplete_Options.py`(마스터 템플릿 `구조물옵션표시.json` · 숨긴 것만 저장).
 * ========================================================================== */

import { createButton, createTag, el, showToast } from "@ui/ui_template_elements";
import {
  fetchStructureOptions,
  saveStructureOptions,
  StaleError,
  type OptionKind,
  type OptionsDoc,
} from "./M02_MasterTemplete_Api_Fetch";
import { to } from "./M02_MasterTemplete_Options_Text";

export interface OptionsSectionOptions {
  isAdmin: boolean;
  /** 저장 안 한 고침을 버릴지 확인 — 취소면 false */
  confirmLeave: () => Promise<boolean>;
  /** 메인 칸에 화면을 띄움 — 고침 표시 손잡이를 돌려받음 */
  show: (label: string, node: HTMLElement) => (dirty: boolean) => void;
  /** 화면을 열었음 — 좌측 다른 고름 표시를 지움 */
  onOpen: () => void;
}

export interface OptionsSection {
  title: string;
  body: HTMLElement;
  /** 다른 화면을 열었음 — 고름 표시만 지움 */
  clear: () => void;
}

const why = (error: unknown): string => (error instanceof Error ? error.message : "");

export function buildOptionsSection(opt: OptionsSectionOptions): OptionsSection {
  const row = el("button", {
    className: "m02-side__item ui-sidebar-row",
    text: to("Row"),
    attrs: { type: "button", "data-options-row": "" },
  });
  const body = el("div", { className: "m02-side__items ui-sidebar-list", children: [row] });
  row.addEventListener("click", () => void open());

  /** 이 화면이 열려 있는 동안 참 — 다른 것이 열리면 `clear` 가 내림 */
  let opened = false;
  const mark = (on: boolean): void => {
    opened = on;
    row.classList.toggle("is-active", on);
  };

  async function open(): Promise<void> {
    if (opened || !(await opt.confirmLeave())) return;
    let doc: OptionsDoc;
    try {
      doc = await fetchStructureOptions();
    } catch (error) {
      return showToast(to("Load_Failed", why(error)), "error");
    }
    draw(doc);
  }

  /** 메인 칸 화면 — `doc.표시` 를 고칠 사본(저장 전까지 서버에 안 감)으로 쥠 */
  function draw(doc: OptionsDoc): void {
    let version = doc.판;
    const edit = opt.isAdmin;
    /** 숨긴 옵션 — 종류 → 키 집합 */
    const hidden = new Map<string, Set<string>>();
    const load = (src: OptionsDoc["표시"]): void => {
      hidden.clear();
      for (const [id, keys] of Object.entries(src)) hidden.set(id, new Set(Object.keys(keys)));
    };
    load(doc.표시);
    let kinds = doc.종류;
    let current: OptionKind | null = null;

    const kindList = el("div", { className: "m02-opts__kinds" });
    const optionList = el("div", { className: "m02-opts__list" });
    const off = (id: string): number => hidden.get(id)?.size ?? 0;

    const paintKinds = (): void => {
      const parts: HTMLElement[] = [];
      let group = "";
      for (const k of kinds) {
        if (k.group !== group) {
          group = k.group;
          parts.push(
            el("h4", {
              className: "m02-opts__group",
              text: group.length === 1 ? to("Group", group) : group,
            }),
          );
        }
        const n = off(k.type_id);
        const b = el("button", {
          className: `m02-opts__kind${k.type_id === current?.type_id ? " is-active" : ""}`,
          attrs: { type: "button", "data-options-kind": k.type_id },
          children: [
            el("span", { text: k.name }),
            ...(n ? [createTag(to("Hidden", String(n)), "warning")] : []),
            ...(k.enabled ? [] : [createTag(to("Off"), "neutral")]),
          ],
        });
        b.addEventListener("click", () => {
          current = k;
          paintKinds();
          paintOptions();
        });
        parts.push(b);
      }
      kindList.replaceChildren(...parts);
    };

    const paintOptions = (): void => {
      if (!current) {
        optionList.replaceChildren(el("p", { className: "m02-side__empty", text: to("Pick") }));
        return;
      }
      const kind = current;
      optionList.replaceChildren(
        el("h3", { className: "m02-matset__head", text: kind.name }),
        ...kind.options.map((o) => {
          const box = el("input", {
            attrs: { type: "checkbox", "data-options-key": o.key },
          }) as HTMLInputElement;
          box.checked = !hidden.get(kind.type_id)?.has(o.key);
          box.disabled = !edit;
          box.addEventListener("change", () => {
            const set = hidden.get(kind.type_id) ?? new Set<string>();
            if (box.checked) set.delete(o.key);
            else set.add(o.key);
            hidden.set(kind.type_id, set);
            setDirty(true);
            paintKinds();
          });
          const tags: HTMLElement[] = [];
          if (o.phase === "detail") tags.push(createTag(to("Detail"), "accent"));
          if (o.required && o.phase === "b05") {
            const tag = createTag(to("Required"), "danger");
            tag.title = to("RequiredTip");
            tags.push(tag);
          }
          return el("label", {
            className: "m02-opts__option",
            children: [
              box,
              el("span", { text: o.label }),
              el("small", { className: "m02-opts__key", text: o.key }),
              ...tags,
            ],
          });
        }),
      );
    };

    const save = createButton({ label: to("Save"), variant: "filled" });
    const all = createButton({ label: to("ShowAll"), variant: "ghost" });
    all.addEventListener("click", () => {
      if (![...hidden.values()].some((s) => s.size)) return;
      hidden.clear();
      setDirty(true);
      paintKinds();
      paintOptions();
    });
    save.addEventListener("click", async () => {
      const 표시: OptionsDoc["표시"] = {};
      for (const [id, keys] of hidden)
        if (keys.size) 표시[id] = Object.fromEntries([...keys].map((k) => [k, false as const]));
      save.disabled = true; // 연달아 눌러도 한 번만
      try {
        const done = await saveStructureOptions(version, 표시);
        version = done.판;
        load(done.표시);
        setDirty(false);
        showToast(to("Saved"), "success");
        paintKinds();
        paintOptions();
      } catch (error) {
        if (error instanceof StaleError) {
          showToast(to("Stale"), "error");
          try {
            const fresh = await fetchStructureOptions();
            version = fresh.판;
            kinds = fresh.종류;
            load(fresh.표시);
            setDirty(false);
            current = kinds.find((k) => k.type_id === current?.type_id) ?? null;
            paintKinds();
            paintOptions();
          } catch (again) {
            showToast(to("Load_Failed", why(again)), "error");
          }
        } else showToast(to("Failed", why(error)), "error");
      } finally {
        save.disabled = false;
      }
    });

    const node = el("div", {
      className: "m02-opts",
      children: [
        el("p", { className: "m02-side__empty", text: to("Note") }),
        el("div", {
          className: "m02-opts__panes",
          children: [kindList, optionList],
        }),
        ...(edit ? [el("div", { className: "m02-side__row", children: [save, all] })] : []),
      ],
    });
    const setDirty = opt.show(to("Screen"), node);
    paintKinds();
    paintOptions();
    opt.onOpen();
    mark(true);
  }

  return { title: to("Title"), body, clear: () => mark(false) };
}