/* =============================================================================
 * M01_EasyCalc_Entry.ts
 * 쉬운 단가산출 시험 길 — 들어가는 단추 · 큰 창 틀 · 시작 화면 · 고치는 화면 틀(위 띠 · 자리들)
 * 모양은 `docs/raw/M01_쉬운단가/설계.md` · 이 폴더째 지워도 됨(폴더 밖 참조는 LogicLab.ts 두 줄).
 * 1걸음 = 틀만 — 카드 · 설계 때 정하는 값 · 실무 일위대가표 · 저장 · 지우기 · 되돌리기는 2걸음에 이음.
 * ========================================================================== */

import { currentLanguageIndex } from "@ui/ui_template_locale";
import {
  createButton,
  createInputField,
  createSelectField,
  createTag,
  el,
  showConfirmDialog,
  showToast,
} from "@ui/ui_template_elements";
import { openModal } from "@ui/ui_template_modal";
import { fetchLogic, fetchLogics, type LogicRow } from "../M01_MasterData_UI_Logic_Api";
import {
  listEasy,
  openEasy,
  plainError,
  type EasyListItem,
  type EasyOpened,
} from "./M01_EasyCalc_Api";
import type { EasyDoc } from "./M01_EasyCalc_Model";
import "./M01_EasyCalc_Style.css";

const TEXT = {
  Open: ["쉬운 단가산출(시험)", "Easy unit-price (trial)"],
  Title: ["쉬운 단가산출", "Easy unit-price"],
  CloseWindow: ["창 닫기", "Close window"],
  Close: ["닫기", "Close"],
  Loading: ["불러오는 중", "Loading"],
  LoadFailed: ["목록을 못 불러옴 — {v}", "Could not load the list — {v}"],
  Start_Ask: ["무엇과 비슷한가요?", "What is it similar to?"],
  Start_Search: ["이름으로 찾기 — 예: 거푸집", "Search by name — e.g. formwork"],
  Start_Blank: ["빈 종이로 새로 만들기", "Start from a blank sheet"],
  Start_Mine: ["내가 만든 것", "Made by me"],
  Start_MineNone: ["아직 없음", "None yet"],
  Start_Found: ["찾은 것", "Found"],
  Start_Count: ["{n} 개 중 {m} 개 보임 — 더 좁혀 찾기", "Showing {m} of {n} — narrow the search"],
  Start_None: ["찾은 것 없음", "Nothing found"],
  Base: ["품셈 기본", "Standard"],
  Mine: ["내가 만든 것", "Made by me"],
  CannotOpen: ["쉬운 길로 못 엶", "Not for the easy view"],
  Per: ["{u} 당", "per {u}"],
  Name: ["이름", "Name"],
  NamePlaceholder: ["예: 거푸집 설치", "e.g. formwork setup"],
  Spec: ["크기", "Size"],
  Unit: ["단위", "Unit"],
  Total: ["{u} 만드는 데 {v} 원", "{v} won to make {u}"],
  Undo: ["되돌리기", "Undo"],
  Save: ["저장", "Save"],
  Delete: ["지우기", "Delete"],
  Unsaved: ["저장 안 함", "Not saved"],
  BaseNote: [
    "품셈 기본은 읽기만 — 고치려면 아래 단추로 내 것을 만듦",
    "Standard items are read-only — use the button below to make your own copy",
  ],
  BaseCopy: ["이걸 바탕으로 고치기", "Edit a copy of this"],
  Trial: ["설계 때 정하는 값", "Values set at design time"],
  Cards: ["무엇이 들어가나", "What goes in"],
  Sheet: ["실무 일위대가표로 보기", "View as a unit-cost sheet"],
  NotYet: ["준비 중", "Coming soon"],
  Leave_Ask: [
    "저장 안 한 것이 있음 — 저장하지 않고 닫을까요?",
    "There are unsaved changes — close without saving?",
  ],
  Leave_Ok: ["저장 안 하고 닫기", "Close without saving"],
} as const;

type TextKey = keyof typeof TEXT;

const te = (key: TextKey, vars: Record<string, string | number> = {}): string =>
  Object.entries(vars).reduce(
    (text, [k, v]) => text.replace(`{${k}}`, String(v)),
    (TEXT[key][currentLanguageIndex as 0 | 1] ?? TEXT[key][0]) as string,
  );

/** 목록에 한 번에 보이는 줄 수 */
const SHOWN = 50;

/* ponytail: Api(sub4) 속이 「준비 중」 인 동안만 Logic_Api 로 대신함 — Api 가 채워지면 아래 셋의 catch 를 지움 */
const loadList = (): Promise<EasyListItem[]> =>
  listEasy("").catch(() =>
    fetchLogics().then((all) =>
      all.map((x) => {
        const isBase = !x.키.startsWith("GX");
        const canOpen = x.결과단위.startsWith("원/");
        return {
          key: x.키,
          name: x.이름,
          isBase,
          owner: isBase ? te("Base") : te("Mine"),
          resultUnit: x.결과단위,
          canOpen,
          whyNot: canOpen ? null : te("CannotOpen"),
          where: `${x.구분} ${x.상세구분}`.trim(),
        };
      }),
    ),
  );
const loadOne = (key: string): Promise<EasyOpened> =>
  openEasy(key).catch(() =>
    fetchLogic(key).then((one) => ({
      row: one.logic,
      version: one.version,
      isBase: !one.logic.키.startsWith("GX"),
      trial: {},
    })),
  );
const plain = (error: unknown): string => {
  try {
    return plainError(error);
  } catch {
    return error instanceof Error ? error.message : String(error);
  }
};

/** 빈 종이 — 꼭 채울 칸만(검토 A 「꼭 채울 것」) · 구분 · 상세구분 · 소유 · 키는 서버가 채움 */
const blankRow = (resultUnit: string): LogicRow => ({
  키: "",
  원문번호: "",
  이름: "",
  결과단위: resultUnit,
  출처: "자체",
  입력: [],
  중간: [],
  호표: [],
  덧줄: [],
  끝수: null,
});

const docOf = (opened: EasyOpened, key: string | null): EasyDoc => ({
  key,
  version: opened.version,
  isBase: opened.isBase,
  name: opened.row.이름,
  spec: "",
  resultUnit: opened.row.결과단위,
  inputs: opened.row.입력 ?? [],
  cards: [],
  row: opened.row,
});
/** 「원/㎡」 → 「㎡」 */
const unitOf = (resultUnit: string): string => resultUnit.replace(/^원\//, "");
/** 「㎡」 → 「1㎡」 · 「100m」 은 그대로 */
const amountOf = (resultUnit: string): string => {
  const unit = unitOf(resultUnit);
  return /^\d/.test(unit) ? unit : `1${unit}`;
};

/** 「추가」 옆에 놓는 단추 — 누르면 큰 창 */
export function createEasyCalcButton(): HTMLButtonElement {
  return createButton({ label: te("Open"), variant: "filled", onClick: openEasyCalc });
}

function openEasyCalc(): void {
  let body: HTMLElement;
  let paper: EasyDoc | null = null;
  let dirty = false;
  let logics: EasyListItem[] | null = null;
  let query = "";

  /** 저장 안 한 것이 있으면 한 번 물음 — 닫아도 되면 true */
  const mayLeave = async (): Promise<boolean> =>
    !paper || !dirty || showConfirmDialog(te("Leave_Ask"), te("Leave_Ok"));

  const notYet = (): void => showToast(te("NotYet"), "info");

  /* ---------- 시작 화면 ---------- */

  const listRow = (item: EasyListItem): HTMLElement => {
    const ok = item.canOpen;
    const row = el("button", {
      className: "m01-easycalc__item",
      attrs: { type: "button" },
      children: [
        el("span", { className: "m01-easycalc__item-name", text: item.name }),
        createTag(item.owner, item.isBase ? "neutral" : "accent"),
        el("span", {
          className: "m01-easycalc__item-unit",
          text: ok ? te("Per", { u: amountOf(item.resultUnit) }) : item.resultUnit,
        }),
        ...(ok ? [] : [createTag(item.whyNot ?? te("CannotOpen"), "warning")]),
      ],
    });
    row.disabled = !ok;
    row.title = item.where;
    row.addEventListener("click", () => void openPaper(item.key));
    return row;
  };

  const showStart = async (): Promise<void> => {
    paper = null;
    dirty = false;
    const status = el("p", { className: "m01-easycalc__muted", text: te("Loading") });
    const mineHost = el("div", { className: "m01-easycalc__list" });
    const foundHost = el("div", { className: "m01-easycalc__list" });
    const search = createInputField({
      type: "search",
      placeholder: te("Start_Search"),
      value: query,
      onInput: (v) => {
        query = v;
        drawFound();
      },
    });
    search.root.classList.add("m01-easycalc__search");

    const drawFound = (): void => {
      if (!logics) return;
      const words = query.trim().toLowerCase().split(/\s+/).filter(Boolean);
      const hits = words.length
        ? logics.filter((x) => words.every((w) => x.name.toLowerCase().includes(w)))
        : logics;
      status.textContent = !hits.length
        ? te("Start_None")
        : hits.length > SHOWN
          ? te("Start_Count", { n: hits.length.toLocaleString(), m: SHOWN })
          : "";
      foundHost.replaceChildren(...hits.slice(0, SHOWN).map(listRow));
    };

    body.replaceChildren(
      el("div", {
        className: "m01-easycalc__start",
        children: [
          el("div", {
            className: "m01-easycalc__start-col",
            children: [
              el("h3", { className: "m01-easycalc__ask", text: te("Start_Ask") }),
              search.root,
              el("h4", { text: te("Start_Found") }),
              status,
              foundHost,
            ],
          }),
          el("div", {
            className: "m01-easycalc__start-col m01-easycalc__start-side",
            children: [
              createBigButton(te("Start_Blank"), () => openBlank()),
              el("h4", { text: te("Start_Mine") }),
              mineHost,
            ],
          }),
        ],
      }),
    );
    search.input.focus();

    try {
      logics ??= await loadList();
    } catch (error) {
      status.textContent = te("LoadFailed", { v: plain(error) });
      return;
    }
    const mine = logics.filter((x) => !x.isBase);
    mineHost.replaceChildren(
      ...(mine.length
        ? mine.map(listRow)
        : [el("p", { className: "m01-easycalc__muted", text: te("Start_MineNone") })]),
    );
    drawFound();
  };

  /* ---------- 고치는 화면 ---------- */

  const openBlank = (): void => {
    const row = blankRow(unitChoices()[0] ?? "원/㎡");
    paper = { ...docOf({ row, version: "", isBase: false, trial: {} }, null), version: null };
    showPaper();
  };

  const openPaper = async (key: string): Promise<void> => {
    body.replaceChildren(el("p", { className: "m01-easycalc__muted", text: te("Loading") }));
    try {
      paper = docOf(await loadOne(key), key);
      showPaper();
    } catch (error) {
      showToast(plain(error), "error");
      void showStart();
    }
  };

  /** 단위 고르기 후보 — 목록에 많이 쓰인 「원/…」 차례 */
  const unitChoices = (): string[] => {
    const count = new Map<string, number>();
    for (const x of logics ?? []) {
      if (x.canOpen) count.set(x.resultUnit, (count.get(x.resultUnit) ?? 0) + 1);
    }
    return [...count.entries()].sort((a, b) => b[1] - a[1]).map(([u]) => u);
  };

  const showPaper = (): void => {
    const p = paper;
    if (!p) return;
    const readOnly = p.isBase;
    const unsaved = createTag(te("Unsaved"), "warning");
    unsaved.hidden = true;
    const total = el("div", { className: "m01-easycalc__total" });
    const drawTotal = (): void => {
      total.textContent = te("Total", { u: amountOf(p.resultUnit), v: "—" });
    };
    const touched = (): void => {
      dirty = true;
      unsaved.hidden = false;
    };

    const name = createInputField({
      label: te("Name"),
      placeholder: te("NamePlaceholder"),
      value: p.name,
      onInput: (v) => {
        p.name = v;
        touched();
      },
    });
    const spec = createInputField({
      label: te("Spec"),
      value: p.spec,
      onInput: (v) => {
        p.spec = v;
        touched();
      },
    });
    const units = unitChoices();
    if (!units.includes(p.resultUnit)) units.unshift(p.resultUnit);
    const unit = createSelectField({
      label: te("Unit"),
      options: units.map((u) => ({ value: u, text: unitOf(u) })),
      value: p.resultUnit,
      disabled: readOnly,
      onChange: (v) => {
        p.resultUnit = v;
        drawTotal();
        touched();
      },
    });
    name.input.disabled = readOnly;
    spec.input.disabled = readOnly;
    name.root.classList.add("m01-easycalc__name");

    const undo = createButton({ label: te("Undo"), variant: "ghost", onClick: notYet });
    undo.disabled = true;
    const close = createButton({
      label: te("Close"),
      variant: "ghost",
      onClick: () =>
        void (async () => {
          if (await mayLeave()) void showStart();
        })(),
    });
    const actions = readOnly
      ? [close]
      : [
          undo,
          createButton({ label: te("Save"), onClick: notYet }),
          ...(p.key && !p.isBase
            ? [createButton({ label: te("Delete"), variant: "danger", onClick: notYet })]
            : []),
          close,
        ];

    const section = (title: string, extra = ""): HTMLElement =>
      el("section", {
        className: `m01-easycalc__part ${extra}`.trim(),
        children: [
          el("h4", { text: title }),
          el("p", { className: "m01-easycalc__muted", text: te("NotYet") }),
        ],
      });
    const sheet = el("details", {
      className: "m01-easycalc__part m01-easycalc__sheet",
      children: [
        el("summary", { text: te("Sheet") }),
        el("p", { className: "m01-easycalc__muted", text: te("NotYet") }),
      ],
    });

    drawTotal();
    body.replaceChildren(
      el("div", {
        className: "m01-easycalc__strip",
        children: [
          name.root,
          spec.root,
          unit.root,
          total,
          unsaved,
          el("div", { className: "m01-easycalc__actions", children: actions }),
        ],
      }),
      ...(readOnly
        ? [
            el("div", {
              className: "m01-easycalc__base",
              children: [
                el("p", { text: te("BaseNote") }),
                createBigButton(te("BaseCopy"), notYet),
              ],
            }),
          ]
        : []),
      section(te("Trial"), "m01-easycalc__trial"),
      section(te("Cards"), "m01-easycalc__cards"),
      sheet,
    );
    if (!readOnly) name.input.focus();
  };

  // 화면 함수들을 다 만든 뒤에 엶 — mount 가 바로 showStart 를 부름
  openModal({
    title: te("Title"),
    closeLabel: te("CloseWindow"),
    dialogClass: "m01-easycalc",
    beforeClose: mayLeave,
    mount: (host) => {
      body = host;
      void showStart();
    },
  });
}

function createBigButton(label: string, onClick: () => void): HTMLButtonElement {
  const button = createButton({ label, variant: "filled", onClick });
  button.classList.add("m01-easycalc__big");
  return button;
}