/* =============================================================================
 * M01_EasyCalc_Pick.ts
 * 쉬운 단가산출 고르기 창 — 물음 셋(① 무엇 → ② 어떤 것 → ③ 얼마) · 한 화면 한 물음.
 * 돌려주는 PickResult.element = 호표 「요소」 칸에 들어갈 값 그대로. 모양은 설계.md 3절.
 * 글 [한, 영] 짝은 아래 TEXT. 이 폴더째 지워도 됨.
 * ========================================================================== */

import { currentLanguageIndex } from "@ui/ui_template_locale";
import {
  createButton,
  createInputField,
  createSelectField,
  el,
  showToast,
} from "@ui/ui_template_elements";
import { openModal } from "@ui/ui_template_modal";
import { fetchPick, fetchSubs, type SubInfo } from "../M01_MasterData_Api_Fetch";
import { fetchLogic, fetchMaterials, type ElementBrief } from "../M01_MasterData_UI_Logic_Api";
import { listEasy, listMachines, machineElement, plainError } from "./M01_EasyCalc_Api";
import type { PickResult } from "./M01_EasyCalc_Model";
import "./M01_EasyCalc_Pick.css";

type Kind = PickResult["kind"];
/** 후보 줄 — 서버는 구분 · 상세구분도 주지만 ElementBrief 타입에는 없음 */
type Brief = ElementBrief & { 구분?: string; 상세구분?: string };

const TEXT = {
  Title: ["넣을 것 고르기", "Pick what to add"],
  Close: ["닫기", "Close"],
  Back: ["← 뒤로", "← Back"],
  AskKind: ["무엇을 넣을까요?", "What do you want to add?"],
  AskWhich: ["어떤 것인가요?", "Which one?"],
  AskQty: ["얼마나 쓰나요?", "How much?"],
  Person: ["사람", "People"],
  Material: ["재료", "Material"],
  Machine: ["기계", "Machine"],
  Logic: ["다른 일위대가", "Another unit-price job"],
  PersonDesc: ["일하는 사람 — 석공 · 보통인부", "Workers — mason, laborer"],
  MaterialDesc: ["쓰는 물건 — 돌 · 시멘트 · 관", "Things used — stone, cement, pipe"],
  MachineDesc: ["쓰는 기계 — 굴삭기 · 덤프트럭", "Machines used — excavator, truck"],
  LogicDesc: ["이미 만들어 둔 일을 가져다 씀", "Reuse a job already made"],
  Search: ["이름을 쳐서 찾기", "Type a name to search"],
  AllSub: ["전체", "All"],
  SubLabel: ["구분", "Group"],
  DetailLabel: ["상세구분", "Detail"],
  Hint: ["구분을 고르거나 이름을 쳐 보세요", "Choose a group or type a name"],
  Loading: ["찾는 중…", "Searching…"],
  None: ["찾는 것 없음", "Nothing found"],
  Count: ["{n} 개 중 앞 {m} 개", "First {m} of {n}"],
  NoPrice: ["단가 없음", "No price"],
  PerDay: ["하루 {p} 원", "{p} won per day"],
  PerUnit: ["{u} 당 {p} 원", "{p} won per {u}"],
  Picked: ["고른 것", "Chosen"],
  QtyPlace: ["예: 0.072", "e.g. 0.072"],
  QtyLabel: ["{u} (숫자)", "{u} (number)"],
  Rough: ["금액 어림 약 {m} 원", "About {m} won"],
  Add: ["넣기", "Add"],
  QtyBad: ["0 보다 큰 숫자를 쳐 주세요", "Enter a number above 0"],
  Failed: ["불러오지 못함", "Could not load"],
} as const;

const te = (key: keyof typeof TEXT, vars: Record<string, string | number> = {}): string =>
  Object.entries(vars).reduce(
    (text, [k, v]) => text.replace(`{${k}}`, String(v)),
    TEXT[key][currentLanguageIndex] as string,
  );

const won = (n: number): string => Math.round(n).toLocaleString("ko-KR");
/** 목록에 그릴 줄 수 — 더 찾으려면 이름을 쳐서 좁힘 */
const SHOW = 100;
const MAT_FILE = "재료_자재품목.json";

/** 목록 한 줄 — 고르면 PickResult(수량 빼고) 를 만들어 줌 */
interface Candidate {
  name: string;
  spec: string;
  unit: string;
  /** 줄 단위 1 당 단가 · 모르면 null — 금액 어림용 */
  price: number | null;
  /** 줄 오른쪽 글(단가 표시) */
  priceText: string;
  tag?: string;
  make: () => Promise<Omit<PickResult, "qty">>;
}

interface Filter {
  q: string;
  sub: string;
  detail: string;
}

interface Source {
  title: string;
  desc: string;
  /** 구분 · 상세구분 칸을 보일지(재료만) */
  grouped?: boolean;
  /** 이름 · 구분이 비면 목록을 안 부르고 null(안내 글만) */
  load: (f: Filter) => Promise<{ total: number; items: Candidate[] } | null>;
}

/** 찾는 말과 이름이 똑같으면 0 · 그 말로 시작하고 말이 거기서 끝나면(「모래, 서울」 「모래(건조)」) 1 ·
 * 더 이어지면(「모래적사장」) 2 · 나머지 3 — 앞에 놓음(같은 차례끼리 순서는 그대로) */
const byName = <T extends { 이름?: string }>(items: T[], q: string): T[] => {
  const squash = (t: string): string => t.replace(/\s+/g, "").toLowerCase();
  const w = squash(q);
  const rank = (it: T): number => {
    const n = squash(it.이름 ?? "");
    if (n === w) return 0;
    if (!n.startsWith(w)) return 3;
    return /[가-힣a-z0-9]/.test(n.charAt(w.length)) ? 2 : 1;
  };
  return items
    .map((it, i) => ({ it, i, r: rank(it) }))
    .sort((a, b) => a.r - b.r || a.i - b.i)
    .map((x) => x.it);
};

const num = (v: unknown): number | null => (typeof v === "number" && Number.isFinite(v) ? v : null);

const SOURCES: Partial<Record<Kind, Source>> = {
  person: {
    title: te("Person"),
    desc: te("PersonDesc"),
    load: async (f) => {
      const { total, items } = await fetchPick("job", f.q);
      return {
        total,
        items: items.map((it) => {
          const price = num(it.값);
          return {
            name: it.이름,
            spec: it.규격,
            unit: "인",
            price,
            priceText: price === null ? te("NoPrice") : te("PerDay", { p: won(price) }),
            make: async () => ({
              kind: "person",
              name: it.이름,
              spec: it.규격,
              unit: "인",
              element: it.ref,
            }),
          };
        }),
      };
    },
  },
  material: {
    title: te("Material"),
    desc: te("MaterialDesc"),
    grouped: true,
    load: async (f) => {
      if (!f.q && !f.sub) return null;
      const found = f.q
        ? await fetchPick("price", f.q).then((r) => ({
            total: r.total,
            items: byName(r.items, f.q)
              .filter((it) => !f.sub || (it as Brief).구분 === f.sub)
              .map((it) => ({ ...it, 구분: (it as Brief).구분 })),
          }))
        : await fetchMaterials({ sub: f.sub, ...(f.detail ? { detail: f.detail } : {}) }).then(
            (r) => ({
              total: r.total,
              items: r.items.map((it) => ({ ...it, 구분: (it as Brief).구분 ?? f.sub })),
            }),
          );
      return {
        total: found.total,
        items: found.items.map((it) => {
          const name = it.이름 ?? "";
          const spec = it.규격 ?? "";
          const unit = typeof it.단위 === "string" ? it.단위 : "";
          const price = num(it.값);
          const element: Record<string, string> = { 구분: it.구분 ?? f.sub };
          const detail = (it as Brief).상세구분;
          if (detail) element["상세구분"] = detail;
          element["검색어"] = `${name} ${spec}`.trim();
          return {
            name,
            spec,
            unit,
            price,
            priceText:
              price === null ? te("NoPrice") : te("PerUnit", { u: unit || "1", p: won(price) }),
            tag: element["구분"],
            make: async () => ({ kind: "material", name, spec, unit, element }),
          };
        }),
      };
    },
  },
  machine: {
    title: te("Machine"),
    desc: te("MachineDesc"),
    load: async (f) => {
      const items = await listMachines(f.q);
      return {
        total: items.length,
        items: items.map((m) => ({
          name: m.이름,
          spec: m.규격,
          unit: m.단위,
          price: null,
          priceText: "",
          make: async () => {
            const { element, needInputs } = await machineElement(m.분류번호);
            return {
              kind: "machine",
              name: m.이름,
              spec: m.규격,
              unit: m.단위,
              element,
              needInputs,
            };
          },
        })),
      };
    },
  },
  logic: {
    title: te("Logic"),
    desc: te("LogicDesc"),
    load: async (f) => {
      // 돈으로 나오는 일위대가만 — 「원/㎡」 꼴
      const items = (await listEasy(f.q)).filter((e) => e.resultUnit.startsWith("원/"));
      return {
        total: items.length,
        items: items.map((e) => {
          const unit = e.resultUnit.slice(2);
          return {
            name: e.name,
            spec: "",
            unit,
            price: null,
            priceText: "",
            tag: e.owner,
            make: async () => {
              // 그 일위대가가 받는 값은 같은 이름으로 넘기고 「설계 때 정하는 값」으로 돌려줌(기계와 같은 꼴)
              const needInputs = (await fetchLogic(e.key)).logic.입력;
              const quote = (n: string): string => (/^[\w가-힣]+$/.test(n) ? n : `'${n}'`);
              const rest = needInputs.map((i) => `, ${quote(i.이름)}=${quote(i.이름)}`).join("");
              return {
                kind: "logic",
                name: e.name,
                spec: "",
                unit,
                element: `로직(${e.key}${rest})`,
                needInputs,
              };
            },
          };
        }),
      };
    },
  },
};

/** 물음 셋 — 고른 것 · 취소는 null */
export function openEasyPick(
  kind?: Kind,
  opts: { qty?: number | null } = {},
): Promise<PickResult | null> {
  return new Promise((resolve) => {
    let settled = false;
    const finish = (r: PickResult | null): void => {
      if (!settled) resolve(r);
      settled = true;
    };
    openModal({
      title: te("Title"),
      closeLabel: te("Close"),
      dialogClass: "m01-easypick",
      beforeClose: () => (finish(null), true),
      mount: (body, close) => {
        const done = (r: PickResult): void => (finish(r), close());
        const stepKinds = (): void => {
          body.replaceChildren(
            el("h4", { className: "m01-easypick__ask", text: te("AskKind") }),
            kindButtons(),
          );
          body.querySelector<HTMLElement>("button")?.focus();
        };
        const kindButtons = (): HTMLElement => {
          const order: Kind[] = ["person", "material", "machine", "logic"];
          const grid = el("div", { className: "m01-easypick__kinds" });
          order.forEach((k, i) => {
            const src = SOURCES[k];
            const b = el("button", {
              className: "m01-easypick__kind",
              attrs: { type: "button", "data-kind": k, "aria-keyshortcuts": String(i + 1) },
              children: [
                el("strong", { text: src?.title ?? labelOf(k) }),
                el("span", { text: src?.desc ?? descOf(k) }),
              ],
            });
            b.addEventListener("click", () => stepList(k, true));
            grid.append(b);
          });
          grid.addEventListener("keydown", (ev) => {
            const k = order[Number(ev.key) - 1];
            if (k) stepList(k, true);
          });
          return grid;
        };
        const stepList = (k: Kind, canBack: boolean): void => {
          const src = SOURCES[k];
          if (!src) return;
          const back = canBack ? stepKinds : null;
          const search = createInputField({ type: "search", placeholder: te("Search") });
          const filter: Filter = { q: "", sub: "", detail: "" };
          const list = el("div", { className: "m01-easypick__list", attrs: { role: "listbox" } });
          const count = el("span", { className: "m01-easypick__muted" });
          const bar: HTMLElement[] = [search.root];
          let seq = 0;
          const load = async (): Promise<void> => {
            const mine = ++seq;
            count.textContent = "";
            list.replaceChildren(
              el("p", { className: "m01-easypick__muted", text: te("Loading") }),
            );
            try {
              const found = await src.load(filter);
              if (mine !== seq) return; // 최신 응답만
              if (!found)
                return void list.replaceChildren(
                  el("p", { className: "m01-easypick__muted", text: te("Hint") }),
                );
              const shown = found.items.slice(0, SHOW);
              count.textContent = te("Count", { n: found.total, m: shown.length });
              list.replaceChildren(
                ...(shown.length
                  ? shown.map((c) =>
                      rowOf(c, () => stepQty(k, c, back ? () => stepList(k, canBack) : null)),
                    )
                  : [el("p", { className: "m01-easypick__muted", text: te("None") })]),
              );
            } catch (e) {
              if (mine === seq) showToast(plainError(e), "error");
            }
          };
          if (src.grouped) bar.unshift(...subFilters(filter, load));
          let timer = 0;
          search.input.addEventListener("input", () => {
            filter.q = search.input.value.trim();
            window.clearTimeout(timer);
            timer = window.setTimeout(load, 250);
          });
          body.replaceChildren(
            ...(back ? [createButton({ label: te("Back"), variant: "ghost", onClick: back })] : []),
            el("h4", { className: "m01-easypick__ask", text: `${src.title} — ${te("AskWhich")}` }),
            el("div", { className: "m01-easypick__bar", children: bar }),
            count,
            list,
          );
          body.onkeydown = (ev) => {
            if (back && ev.altKey && ev.key === "ArrowLeft") back();
            else if (ev.key === "ArrowDown" || ev.key === "ArrowUp") moveFocus(body, ev);
          };
          search.input.focus();
          void load();
        };
        const stepQty = (k: Kind, c: Candidate, back: (() => void) | null): void => {
          const qty = createInputField({
            type: "text",
            label: te("QtyLabel", { u: c.unit || "—" }),
            placeholder: te("QtyPlace"),
          });
          qty.input.inputMode = "decimal";
          if (opts.qty != null) qty.input.value = String(opts.qty); // 다시 고르기 — 지금 수량 미리 채움
          const rough = el("p", { className: "m01-easypick__rough" });
          const parse = (): number | null => {
            const n = Number(qty.input.value.trim().replace(/,/g, ""));
            return qty.input.value.trim() !== "" && Number.isFinite(n) && n > 0 ? n : null;
          };
          const refresh = (): void => {
            const n = parse();
            rough.textContent =
              n !== null && c.price !== null ? te("Rough", { m: won(n * c.price) }) : "";
            qty.setError(undefined);
          };
          const submit = async (): Promise<void> => {
            const n = parse();
            if (n === null) return qty.setError(te("QtyBad"));
            try {
              done({ ...(await c.make()), qty: n });
            } catch (e) {
              qty.setError(plainError(e));
            }
          };
          qty.input.addEventListener("input", refresh);
          qty.input.addEventListener("keydown", (ev) => ev.key === "Enter" && void submit());
          body.replaceChildren(
            ...(back ? [createButton({ label: te("Back"), variant: "ghost", onClick: back })] : []),
            el("h4", { className: "m01-easypick__ask", text: te("AskQty") }),
            el("p", {
              className: "m01-easypick__chosen",
              children: [
                el("span", { className: "m01-easypick__muted", text: te("Picked") }),
                el("strong", { text: ` ${c.name} ${c.spec}`.trimEnd() }),
              ],
            }),
            qty.root,
            rough,
            createButton({ label: te("Add"), variant: "filled", onClick: () => void submit() }),
          );
          body.onkeydown = (ev) => ev.altKey && ev.key === "ArrowLeft" && back?.();
          qty.input.focus();
          void k;
        };
        if (kind) stepList(kind, false);
        else stepKinds();
      },
    });
  });
}

const labelOf = (k: Kind): string =>
  te(({ person: "Person", material: "Material", machine: "Machine", logic: "Logic" } as const)[k]);
const descOf = (k: Kind): string =>
  te(
    (
      {
        person: "PersonDesc",
        material: "MaterialDesc",
        machine: "MachineDesc",
        logic: "LogicDesc",
      } as const
    )[k],
  );

/** 목록 줄 — 이름 · 크기 · 단위 · 단가 */
function rowOf(c: Candidate, onPick: () => void): HTMLElement {
  const b = el("button", {
    className: "m01-easypick__row",
    attrs: { type: "button", role: "option" },
    children: [
      el("span", {
        className: "m01-easypick__name",
        children: [
          el("strong", { text: c.name }),
          ...(c.spec ? [el("span", { className: "m01-easypick__muted", text: ` ${c.spec}` })] : []),
          ...(c.tag ? [el("span", { className: "m01-easypick__tag", text: c.tag })] : []),
        ],
      }),
      el("span", { className: "m01-easypick__unit", text: c.unit }),
      el("span", { className: "m01-easypick__price", text: c.priceText }),
    ],
  });
  b.addEventListener("click", onPick);
  return b;
}

/** 위·아래 화살표로 찾기 칸 ↔ 줄 사이 오감 */
function moveFocus(body: HTMLElement, ev: KeyboardEvent): void {
  const items = [...body.querySelectorAll<HTMLElement>("input[type=search], .m01-easypick__row")];
  const at = items.indexOf(document.activeElement as HTMLElement);
  if (at < 0) return;
  const next = items[at + (ev.key === "ArrowDown" ? 1 : -1)];
  if (!next) return;
  ev.preventDefault();
  next.focus();
}

/** 재료 구분 → 상세구분 고르기 칸 둘 — 바꾸면 load 다시 */
function subFilters(filter: Filter, load: () => Promise<void>): HTMLElement[] {
  let subs: SubInfo[] = [];
  const all = { value: "", text: te("AllSub") };
  const subBox = createSelectField({
    options: [all],
    value: "",
    compact: true,
    ariaLabel: te("SubLabel"),
    onChange: (v) => ((filter.sub = v), (filter.detail = ""), fillDetail(), void load()),
  });
  const detailBox = createSelectField({
    options: [all],
    value: "",
    compact: true,
    ariaLabel: te("DetailLabel"),
    onChange: (v) => ((filter.detail = v), void load()),
  });
  const fillDetail = (): void => {
    const details = subs.find((s) => s.name === filter.sub)?.details ?? [];
    detailBox.root.hidden = !details.length;
    detailBox.setOptions([all, ...details.map((d) => ({ value: d, text: d }))], "");
  };
  fillDetail();
  void fetchSubs({ file: MAT_FILE })
    .then((r) => {
      subs = r;
      subBox.setOptions([all, ...r.map((s) => ({ value: s.name, text: s.name }))], filter.sub);
    })
    .catch(() => showToast(te("Failed"), "error"));
  return [subBox.root, detailBox.root];
}