/* =============================================================================
 * M02_MasterTemplete_ItemPick.ts
 * 가져올 곳 고르기(PLAN 39-5) — 탭(마스터 · 회사 · 개인 · 다른 사람 · 실무문서) + 항목 목록(`ItemList`).
 * 복사 생성(상세 칸 안 · `buildPicker`) · 복사해 가져오기(창 · `pickFrom`)가 같이 씀.
 * 탭 목록 · 기본 탭 = `readableSources`(권한 몫 · `M02_MasterTemplete_Layer.ts`) · 탭은 목록만 바꿈
 * (좌측 층 단추와 달리 화면을 다시 안 세움) · 모양은 층 단추(`m02-layers__btn`) 그대로.
 * 다른 사람 = 사람 고르기 하나(`fetchOwners`) · 실무문서 = 마스터 일위대가 조합 줄(일위대가 고를 때만).
 * ========================================================================== */

import { createButton, createSelectField, el, showConfirmDialog } from "@ui/ui_template_elements";
import { openModal } from "@ui/ui_template_modal";
import { fetchSessionUser, type SessionUser } from "../A06_Login/A06_Login_Api_Fetch";
import { fetchOwners, type Layer } from "./M02_MasterTemplete_Api_Fetch";
import {
  buildItemList,
  ITEM_COLS,
  loadItems,
  type Col,
  type ItemRow,
  type ListKind,
} from "./M02_MasterTemplete_ItemList";
import { fetchCombos, type ComboSummary } from "./M02_MasterTemplete_Labor_Api";
import {
  entryFromHash,
  ownOwner,
  readableSources,
  viewCompany,
  type Source,
} from "./M02_MasterTemplete_Layer";
import { leafName } from "./M02_MasterTemplete_TreePanel_Model";
import "./M02_MasterTemplete_TreePanel.css";
import "./M02_MasterTemplete_ItemPick.css";

const TEXT = {
  close: "닫기",
  person: "사람",
  noPeople: "다른 사람이 없음",
  empty: "비어 있음",
  failed: "목록을 못 받음 — {value}",
  makeNew: "새로 만들기",
  makeCopy: "복사 생성",
};

/** 고른 곳 — `practice` = 실무문서(마스터 일위대가 조합) */
export interface From {
  layer: Layer;
  owner: string | null;
  label: string;
  practice: boolean;
}

export type Picked = { from: From; row: ItemRow } | { from: From; combo: ComboSummary };

/** 고른 것 이름 — 확인 글에 씀 */
export const pickedName = (p: Picked): string =>
  "row" in p ? leafName(p.row) : `${p.combo.키} ${p.combo.이름}`;

const PRACTICE_COLS: Col<ComboSummary>[] = [
  { head: "키", get: (c) => c.키 },
  { head: "이름", get: (c) => c.이름 },
  { head: "구분", get: (c) => c.구분 ?? "" },
  { head: "상세구분", get: (c) => c.상세구분 ?? "" },
  { head: "단위", get: (c) => c.단위 ?? "" },
  { head: "담은 로직 수", get: (c) => String(c.count) },
];

const why = (error: unknown): string => (error instanceof Error ? error.message : String(error));
/** 층 폴더가 아직 없는 사람(서버 사람 목록 `비어있음` · 39-6) */
const empty = (o: { owner: string }): boolean => !!(o as { 비어있음?: boolean }).비어있음;

export interface PickerOptions {
  user: SessionUser | null;
  /** 볼 회사(`viewCompany`) */
  company: string | null;
  /** 칸 종류 — 항목 통째(복사 생성) · 도면 · 면적산출 · 일위대가(실무문서 탭이 붙음) */
  kind: ListKind;
  /** 고를 수 없는 줄(받는 열 자신 등) — 목록에서 뺌 */
  skip?: (from: From, row: ItemRow) => boolean;
  onPick: (picked: Picked) => void;
}

/** 탭 + 목록 — 부르는 쪽이 칸 안 · 창에 붙임 */
export function buildPicker(opt: PickerOptions): { root: HTMLElement } {
  const { tabs, first } = readableSources(opt.user, opt.company, {
    practice: opt.kind === "labor",
  });
  const list = buildItemList();
  const people = createSelectField({ options: [], compact: true, label: TEXT.person });
  people.root.hidden = true;
  let owners: { owner: string; name: string }[] | null = null;
  let seq = 0;

  const buttons = tabs.map((tab) => {
    const b = el("button", {
      className: "m02-layers__btn",
      text: tab.label,
      attrs: { type: "button", "data-source": tab.id },
    });
    b.addEventListener("click", () => void show(tab));
    return b;
  });

  async function show(tab: Source): Promise<void> {
    const mine = ++seq;
    buttons.forEach((b) => b.classList.toggle("is-active", b.dataset.source === tab.id));
    people.root.hidden = tab.id !== "people";
    list.message();
    try {
      if (tab.id === "practice") {
        const combos = await fetchCombos();
        if (mine !== seq) return;
        const from = { layer: tab.layer, owner: null, label: tab.label, practice: true };
        return list.show(combos, PRACTICE_COLS, (combo) => opt.onPick({ from, combo }));
      }
      let owner = tab.owner;
      let label = tab.label;
      if (tab.id === "people") {
        // 나는 「개인」 탭 — 뺌 · 빈 사람은 「비어 있음」 · 처음 = 첫 빈 아닌 사람
        const me = ownOwner("personal", opt.user);
        owners ??= (await fetchOwners("personal", opt.company)).filter((o) => o.owner !== me);
        if (mine !== seq) return;
        if (!owners.length) return list.message(TEXT.noPeople);
        if (!people.select.value) {
          people.setOptions(
            owners.map((o) => ({
              value: o.owner,
              text: empty(o) ? `${o.name} · ${TEXT.empty}` : o.name,
            })),
            (owners.find((o) => !empty(o)) ?? owners[0]).owner,
          );
        }
        owner = people.select.value;
        const who = owners.find((o) => o.owner === owner);
        label = `${tab.label} · ${who?.name ?? owner}`;
        if (who && empty(who)) return list.show([], ITEM_COLS[opt.kind], () => {}); // 층 폴더 없음
      }
      const rows = await loadItems(tab.layer, owner);
      if (mine !== seq) return;
      const from = { layer: tab.layer, owner, label, practice: false };
      list.show(
        rows.filter((row) => !opt.skip?.(from, row)),
        ITEM_COLS[opt.kind],
        (row) => opt.onPick({ from, row }),
      );
    } catch (error) {
      if (mine === seq) list.message(TEXT.failed.replace("{value}", why(error)));
    }
  }

  people.select.addEventListener("change", () => {
    const tab = tabs.find((t) => t.id === "people");
    if (tab) void show(tab);
  });
  const start = tabs.find((t) => t.id === first) ?? tabs[0];
  if (start) void show(start);
  return {
    root: el("div", {
      className: "m02-itempick",
      children: [
        el("div", { className: "m02-layers__row", children: [...buttons, people.root] }),
        list.root,
      ],
    }),
  };
}

export interface TwoWayOptions {
  /** 위 안내 한 줄 */
  note: string;
  /** [새로 만들기] — 지금 길(창 · 빈 문서) */
  onNew: () => void;
  /** [복사 생성] 뒤 고를 목록 */
  picker: Omit<PickerOptions, "onPick">;
  /** 줄 누름 → 확인 글(취소면 그대로 고름) */
  ask: (picked: Picked) => string;
  /** 확인 뒤 — 복사(실패 알림은 부르는 쪽) */
  onCopy: (picked: Picked) => Promise<void>;
}

/** [새로 만들기] [복사 생성] 두 단추(39-5 · 답 2) — 복사 생성을 누르면 같은 칸 아래 탭 + 목록 */
export function buildTwoWay(opt: TwoWayOptions): HTMLElement {
  const fresh = createButton({ label: TEXT.makeNew, variant: "filled" });
  const copy = createButton({ label: TEXT.makeCopy, variant: "ghost" });
  const below = el("div", { className: "m02-itempick__below" });
  let busy = false;
  fresh.addEventListener("click", opt.onNew);
  copy.addEventListener("click", () => {
    if (below.firstChild) return;
    copy.classList.add("is-active");
    const picker = buildPicker({
      ...opt.picker,
      onPick: (picked) =>
        void (async () => {
          if (busy || !(await showConfirmDialog(opt.ask(picked)))) return;
          busy = true; // 연달아 눌러도 한 번만
          try {
            await opt.onCopy(picked);
          } finally {
            busy = false;
          }
        })(),
    });
    below.append(picker.root);
  });
  return el("div", {
    className: "m02-itempick__two",
    children: [
      el("p", { className: "m02-itempick__note", text: opt.note }),
      el("div", { className: "m02-itempick__buttons", children: [fresh, copy] }),
      below,
    ],
  });
}

/** 창으로 고름 — 줄 누름 → `ask` 확인(있으면) → 고른 것 · 닫으면 null */
export function pickFrom(
  opt: Omit<PickerOptions, "onPick"> & { title: string; ask?: (picked: Picked) => string },
): Promise<Picked | null> {
  return new Promise((resolve) => {
    let done = false;
    const finish = (value: Picked | null): void => {
      if (!done) resolve(value);
      done = true;
    };
    openModal({
      title: opt.title,
      closeLabel: TEXT.close,
      dialogClass: "m02-modal m02-itempick__dialog",
      beforeClose: () => (finish(null), true),
      mount: (body, close) => {
        const picker = buildPicker({
          ...opt,
          onPick: (picked) =>
            void (async () => {
              if (opt.ask && !(await showConfirmDialog(opt.ask(picked)))) return;
              finish(picked);
              close();
            })(),
        });
        body.append(picker.root);
      },
    });
  });
}

/** 지금 화면의 사람 · 볼 회사로 `pickFrom`(카드 · 집계표 줄처럼 페이지 값을 못 받는 곳) */
export async function pickHere(
  opt: Omit<PickerOptions, "onPick" | "user" | "company"> & {
    title: string;
    ask?: (picked: Picked) => string;
  },
): Promise<Picked | null> {
  const user = await fetchSessionUser().catch(() => null);
  return pickFrom({ ...opt, user, company: viewCompany(entryFromHash(), user) });
}