/* =============================================================================
 * M01_MasterData_UI_Side.ts
 * 왼쪽 패널 — 공용 접기 컨테이너(`ui-collapsible ui-sidebar-section`) 여덟 개
 * 인력 · 재료 · 기계 · 소요량 · 계수 · 환율 · 요율 · 일위대가 로직
 * 펼치면 하위 목록(거름 · 파일) · 환율/요율은 누르면 바로 표 · 로직은 안에 로직 목록
 * ========================================================================== */

import { el, showToast } from "@ui/ui_template_elements";
import { attachCollapsible } from "@ui/ui_template_collapsible";
import { t as L } from "@ui/ui_template_locale";
import {
  fetchFiles,
  fetchRows,
  fetchSubs,
  type FileInfo,
  type SubInfo,
} from "./M01_MasterData_Api_Fetch";
import { renderTree, type MakeRow, type TreeNode } from "./M01_MasterData_UI_Tree";

/** 요소 화면에서 열 것 — 파일 · 하위 거름(구분·세부분류) · 상세구분 · 제목 */
export interface Pick {
  group: string;
  file: FileInfo;
  sub: string;
  detail: string;
  label: string;
}

export interface SideHandle {
  root: HTMLElement;
  /** 일위대가 로직 컨테이너 안(로직 목록이 들어갈 자리) */
  logicHost: HTMLElement;
  /** 그룹의 파일 판본을 다시 받음(저장 뒤) — 돌려받는 것 = 새 목록 */
  refresh: (group: string) => Promise<FileInfo[]>;
  setActive: (id: string | null) => void;
}

const LABOR_FILTER = "m01.laborFilter";
const LABOR_ID = "인력|";
const MATERIAL_NAMES: Record<string, string> = { 나라장터자재: "나라장터", 오피넷유가: "유가" };

/** 파일 이름 → 목록 글자 — 「소요량_건설품셈_10장_창호…」 → 「건설품셈_10장_창호…」 */
export const fileLabel = (file: string): string =>
  file.replace(/^[^_]+_/, "").replace(/\.json$/, "");

const GROUP_TITLE = {
  인력: "M01_GroupLabor",
  재료: "M01_GroupMaterial",
  기계: "M01_GroupMachine",
  소요량: "M01_GroupQuantity",
  계수: "M01_GroupFactor",
  환율: "M01_GroupExchange",
  요율: "M01_GroupRate",
} as const;

type Group = keyof typeof GROUP_TITLE;
const GROUPS = Object.keys(GROUP_TITLE) as Group[];
const LEAF: Group[] = ["환율", "요율"];

export function buildSide(onOpen: (pick: Pick) => void, onLogic: () => void): SideHandle {
  const lists = new Map<Group, FileInfo[]>();
  const bodies = new Map<Group, HTMLElement>();
  const buttons = new Map<string, HTMLElement>();
  const counts = new Map<string, number>();
  // 하위 거름은 서버가 준 목록(파일 머리에 등록된 구분·세부분류) — 새 조사가 늘어도 화면은 그대로
  const kinds = new Map<Group, SubInfo[]>();

  const setActive = (id: string | null): void => {
    for (const [key, button] of buttons) button.classList.toggle("is-active", key === id);
  };

  /** 트리 줄 — 부모는 접기/펴기 · 누를 일이 있는 줄만 밝게 */
  const make: MakeRow = (node, caret, depth, onClick) => {
    const button = el("button", {
      className: "m01-side__item",
      attrs: { type: "button" },
      children: [
        el("span", {
          children: [
            el("span", { className: "m01-tree__caret", text: caret }),
            el("span", { text: node.label }),
          ],
        }),
        ...(node.count === null
          ? []
          : [
              el("span", {
                className: "m01-side__muted",
                text: node.count.toLocaleString("ko-KR"),
              }),
            ]),
      ],
    });
    button.style.paddingLeft = `calc(var(--spacing-8) + ${depth} * var(--spacing-16))`;
    if (node.run) buttons.set(node.id, button);
    button.addEventListener("click", () => {
      if (node.run) setActive(node.id);
      onClick();
    });
    return button;
  };

  /** 인력 — 「전체」 한 줄 + 구분 → 상세구분 두 단 거름(서버가 준 목록 · 고른 것은 기억) */
  const laborFilter = (
    file: FileInfo,
    open: (file: FileInfo, sub: string, label: string, detail?: string) => void,
  ): HTMLElement => {
    const list = kinds.get("인력") ?? [];
    const saved = (() => {
      try {
        return JSON.parse(sessionStorage.getItem(LABOR_FILTER) ?? "[]") as string[];
      } catch {
        return [];
      }
    })();
    const pickSub = list.find((k) => k.name === saved[0]);
    const choose = (name: string, values: string[], value: string): HTMLSelectElement => {
      const select = el("select", {
        className: "m01-side__select",
        attrs: { "aria-label": name },
        children: [L("M01_All"), ...values].map((v, i) =>
          el("option", { text: v, attrs: { value: i ? v : "" } }),
        ),
      });
      select.value = value;
      return select;
    };
    const sub = choose(
      L("M01_LaborSub"),
      list.map((k) => k.name),
      pickSub?.name ?? "",
    );
    const detail = choose(L("M01_LaborDetail"), pickSub?.details ?? [], saved[1] ?? "");
    detail.disabled = !pickSub?.details.length;
    const run = (): void => {
      try {
        sessionStorage.setItem(LABOR_FILTER, JSON.stringify([sub.value, detail.value]));
      } catch {
        /* 기억 못 해도 거름은 됨 */
      }
      const label = [sub.value, detail.value].filter(Boolean).join(" · ") || L("M01_All");
      setActive(LABOR_ID);
      open(file, sub.value, label, detail.value);
    };
    sub.addEventListener("change", () => {
      const details = list.find((k) => k.name === sub.value)?.details ?? [];
      detail.replaceChildren(
        ...[L("M01_All"), ...details].map((v, i) =>
          el("option", { text: v, attrs: { value: i ? v : "" } }),
        ),
      );
      detail.disabled = details.length === 0;
      run();
    });
    detail.addEventListener("change", run);
    const all = make({ id: LABOR_ID, label: L("M01_All"), count: file.rows, run }, "", 0, () => {
      sub.value = detail.value = "";
      sub.dispatchEvent(new Event("change"));
    });
    return el("div", {
      children: [
        all,
        el("label", {
          className: "m01-side__filter",
          children: [el("span", { text: L("M01_LaborSub") }), sub],
        }),
        el("label", {
          className: "m01-side__filter",
          children: [el("span", { text: L("M01_LaborDetail") }), detail],
        }),
      ],
    });
  };

  const drawGroup = (group: Group): void => {
    const files = lists.get(group) ?? [];
    const body = bodies.get(group);
    if (!body) return;
    const open = (file: FileInfo, sub: string, label: string, detail = ""): void =>
      onOpen({ group, file, sub, detail, label });
    const one = files[0];
    if (group === "인력" && one) {
      body.replaceChildren(laborFilter(one, open));
      return;
    }
    if (group === "기계") {
      const list = kinds.get(group) ?? [];
      const all: TreeNode[] = one
        ? [
            {
              id: `${group}\n`,
              label: L("M01_All"),
              count: one.rows,
              open: true,
              run: () => open(one, "", L("M01_All")),
              children: list.map((k) => ({
                id: `${group}\n${k.name}`,
                label: k.name,
                count: counts.get(`${group}\n${k.name}`) ?? null,
                run: () => open(one, k.name, k.name),
                children: k.details.map((d) => ({
                  id: `${group}\n${k.name}\n${d}`,
                  label: d,
                  count: null,
                  run: () => open(one, k.name, `${k.name} · ${d}`, d),
                })),
              })),
            },
          ]
        : [];
      body.replaceChildren(...renderTree(all, make));
      return;
    }
    if (group === "소요량" || group === "계수") {
      // 전체 → 구분(원문+부문) → 상세구분(장) — 목록은 서버가 준 것 · 장 차례대로
      const list = kinds.get(group) ?? [];
      const chapter = (k: SubInfo, detail: string): FileInfo | undefined =>
        files.find((f) => f.file === `${group}_${k.book}_${detail.replaceAll(" ", "_")}.json`);
      const rows = (k: SubInfo): number =>
        k.details.reduce((n, d) => n + (chapter(k, d)?.rows ?? 0), 0);
      const all: TreeNode[] = one
        ? [
            {
              id: `${group}\n`,
              label: L("M01_All"),
              count: files.reduce((n, f) => n + f.rows, 0),
              open: true,
              run: () => open(one, "", L("M01_All")),
              children: list.map((k) => ({
                id: `${group}\n${k.name}`,
                label: k.name,
                count: rows(k),
                run: () => open(chapter(k, k.details[0] ?? "") ?? one, k.name, k.name),
                children: k.details.map((d) => ({
                  id: `${group}\n${k.name}\n${d}`,
                  label: d,
                  count: chapter(k, d)?.rows ?? null,
                  run: () => open(chapter(k, d) ?? one, k.name, `${k.name} · ${d}`, d),
                })),
              })),
            },
          ]
        : [];
      body.replaceChildren(...renderTree(all, make));
      return;
    }
    body.replaceChildren(
      ...renderTree(
        files.map((f) => {
          const name = fileLabel(f.file);
          const label = group === "재료" ? (MATERIAL_NAMES[name] ?? name) : name;
          return { id: `${group}\n${f.file}`, label, count: f.rows, run: () => open(f, "", label) };
        }),
        make,
      ),
    );
  };

  const refresh = async (group: string): Promise<FileInfo[]> => {
    const list = await fetchFiles(group);
    if (list[0] && (group === "인력" || group === "기계")) {
      const file = list[0].file;
      const subs = await fetchSubs({ file });
      kinds.set(group, subs);
      await Promise.all(
        (group === "기계" ? subs : []).map(async (k) =>
          counts.set(`${group}\n${k.name}`, (await fetchRows(file, 1, 1, "", false, k.name)).total),
        ),
      );
    } else if (group === "소요량" || group === "계수") {
      kinds.set(group, await fetchSubs({ group }));
    }
    lists.set(group as Group, list);
    drawGroup(group as Group);
    return list;
  };

  const section = (title: string, body: HTMLElement | null): HTMLElement =>
    el("section", {
      className: "m01-side__group ui-collapsible ui-sidebar-section is-collapsed",
      children: [
        el("h3", { className: "ui-collapsible__title", text: title }),
        ...(body ? [body] : []),
      ],
    });

  const groups = GROUPS.map((group) => {
    const body = LEAF.includes(group) ? null : el("div", { className: "m01-side__items" });
    if (body) bodies.set(group, body);
    const root = section(L(GROUP_TITLE[group]), body);
    if (!body) {
      root.classList.add("m01-side__leaf");
      buttons.set(`${group}\n`, root);
      root.querySelector(".ui-collapsible__title")?.addEventListener("click", () => {
        const one = lists.get(group)?.[0];
        if (!one) return;
        setActive(`${group}\n`);
        onOpen({ group, file: one, sub: "", detail: "", label: L(GROUP_TITLE[group]) });
      });
    }
    return root;
  });

  const logicHost = el("div", { className: "m01-side__items" });
  const logic = section(L("M01_GroupLogic"), logicHost);
  logic.querySelector(".ui-collapsible__title")?.addEventListener("click", () => {
    setActive(null);
    onLogic();
  });

  const root = el("div", { className: "m01-side", children: [...groups, logic] });
  attachCollapsible(root);
  void Promise.all(GROUPS.map(refresh)).catch((error) =>
    showToast(error instanceof Error ? error.message : L("M01_LoadFailed"), "error"),
  );
  return { root, logicHost, refresh, setActive };
}