/* =============================================================================
 * formula_doc_lines.ts
 * 수식 문서 식 줄 · 금액 줄 · 묶음(PLAN 802-3 · 요구 660~664) — 왼쪽 기호 식 · 오른쪽 값 식 한 줄씩(격자 두 칸)
 *   식 줄: 왼쪽 `Q = 3600 × q … ÷ Cm`(그 자리 고침 = 공용 `editEq` · 머리 = 함께) · 오른쪽 `= 값 식 = 결과 단위`
 *          (값 식 숫자 누름 = 그 자리 값 고침 · 기호 값 누름 = 정의 줄 열림 · 그 밖 누름 = 식 고침)
 *   금액 줄: 경쟁사 꼴 `이름 : 단가 × 수량 = 금액`(÷ 한 줄) · 묶음 줄 = 노무비 · 재료비 · 경비 세 줄
 *   묶음: 돈 묶음 하나 = 머리 없이 「계」 · 둘 이상 = 「가. 이름」마다 「소계」 + 맨 끝 「합계」(지어낸 말 없음)
 *   고친 것은 부른 쪽(`formula_doc_screen.ts`) 훅으로 — 여기선 문서를 안 고침
 * ========================================================================== */

import { createButton, createIconButton } from "@ui/ui_template_button";
import { eqText } from "@ui/ui_template_equation";
import { editEq, editNumber, serializeEq, tidyEq } from "@ui/ui_template_equation_edit";
import { el } from "@ui/ui_template_elements";
import { createSelectField } from "@ui/ui_template_input";
import type { DocVar, FormulaDoc, MoneyLine, Node } from "../common_util/common_util_formula_doc";
import type { DocAnswer } from "../common_util/common_util_formula_doc_calc";
import { moneyScope } from "../common_util/common_util_formula_doc_view";
import {
  lineMap,
  litsOf,
  offLine,
  renderNode,
  symNode,
  takenOf,
  tryParse,
  valueNode,
  type Values,
} from "./formula_doc_render";
import { ft } from "./formula_doc_text";

export const COSTS = ["노무비", "재료비", "경비"] as const;
const KIND = [...COSTS, "묶음"];
const ORDER = "가나다라마바사아자차카타파하";

export type EditAt = { kind: "line" | "expr" | "price" | "qty" | "name"; i: number } | null;

export interface LinesHooks {
  admin: boolean;
  /** 선택으로 꺼진 금액 줄도 보임(고침 모드) */
  showOff?: boolean;
  onShowOff?: () => void;
  doc: FormulaDoc;
  answer: DocAnswer;
  vars: Map<string, DocVar>;
  /** 기호 · 금액 줄 이름 → 표지 글 */
  marks: Map<string, string>;
  auto: EditAt;
  onLine: (i: number, text: string) => void;
  onExpr: (i: number, text: string) => void;
  onMoney: (i: number, patch: Partial<MoneyLine> | null) => void;
  onLit: (target: "line" | "price" | "qty", i: number, at: number, value: number) => void;
  onPickVar: (id: string, number?: HTMLElement) => void;
  onAddLine: () => void;
  onAddMoney: (group: string) => void;
  onGroupName: (old: string, now: string) => void;
  onRedraw: () => void;
}

const span = (cls: string, text?: string): HTMLSpanElement =>
  el("span", { className: cls, ...(text !== undefined ? { text } : {}) });

const memo = new WeakMap<DocAnswer, Values>();
/** 기호 값 + 금액 줄 기호(그 줄 금액 — 뒤 금액 줄이 부름) */
function vals(h: LinesHooks): Values {
  let got = memo.get(h.answer);
  if (!got) {
    got = { ...(h.answer.값 ?? {}) };
    const outs = (h.answer.줄 ?? []) as { 금액?: number | null }[];
    (h.doc.금액 ?? []).forEach((l, i) => {
      if (l.기호 && typeof outs[i]?.금액 === "number") got![String(l.기호)] = outs[i].금액;
    });
    memo.set(h.answer, got);
  }
  return got;
}

/** 식 글 → 그림(못 풀면 글 그대로 빨강) · scope = 금액 줄이 부르는 비목 합(앞 줄 누계) */
function expr(
  text: unknown,
  h: LinesHooks,
  side: "sym" | "val",
  inline = false,
  cost?: string,
  scope?: Values,
) {
  const n = tryParse(text);
  if (!n) {
    const raw = span("fdoc__raw", String(text ?? ""));
    if (String(text ?? "").trim()) raw.dataset.bad = "1";
    return { node: raw, tree: null as Node | null };
  }
  const lits = side === "val" ? litsOf(n) : undefined;
  return {
    node: renderNode(n, {
      side,
      vals: scope ? { ...vals(h), ...scope } : vals(h),
      vars: h.vars,
      inline,
      cost,
      lits,
    }),
    tree: n,
  };
}

/** 그 자리 고침 시작 — 누른 자리에 커서 */
function startEdit(
  host: HTMLElement,
  h: LinesHooks,
  commit: (text: string) => void,
  at?: { x: number; y: number },
): void {
  if (host.dataset.editing) return;
  editEq(host, {
    at,
    onInput: (text) => {
      const body = text.includes(" = ") ? text.slice(text.indexOf(" = ") + 3) : text;
      host.toggleAttribute("data-bad", !!body.trim() && !tryParse(body));
    },
    onCommit: commit,
    onCancel: () => h.onRedraw(),
  });
  // 전체 고르기 = 한 줄 글(선형 꼴)로 바꿔 통째로 고침 · 지움
  host.addEventListener("keydown", (ev) => {
    if (!(ev.ctrlKey || ev.metaKey) || ev.key.toLowerCase() !== "a") return;
    ev.preventDefault();
    host.textContent = tidyEq(serializeEq(host));
    window.getSelection()?.selectAllChildren(host);
  });
}

/** 값 식 누름 — 수 = 그 자리 값 · 기호 값 = 정의 줄 · 그 밖 = 식 고침 */
function onValueClick(
  ev: MouseEvent,
  host: HTMLElement,
  h: LinesHooks,
  target: "line" | "price" | "qty",
  i: number,
  editAll: () => void,
): void {
  if (!h.admin || host.dataset.editing) return;
  const t = ev.target as HTMLElement;
  const lit = t.closest<HTMLElement>("[data-lit]");
  const atom = t.closest<HTMLElement>("[data-var]");
  if (lit && host.contains(lit)) {
    ev.stopPropagation();
    editNumber(lit, (text) => {
      const v = Number(text.replace(/,/g, ""));
      if (Number.isFinite(v)) h.onLit(target, i, Number(lit.dataset.lit), v);
      else h.onRedraw();
    });
  } else if (atom && host.contains(atom)) {
    ev.stopPropagation();
    h.onPickVar(atom.dataset.var!, atom.querySelector<HTMLElement>(".ui-eq__num") ?? undefined);
  } else editAll();
}

function lineRow(i: number, h: LinesHooks): HTMLElement[] {
  const line = (h.doc.식 ?? [])[i];
  const head = String(line.기호 ?? "");
  const left = el("div", { className: "fdoc__cell fdoc__sym", attrs: { "data-line": String(i) } });
  const edit = span("fdoc__edit");
  if (head) {
    const a = span("ui-eq__var fdoc__atom fdoc__head");
    a.dataset.tok = head;
    a.append(symNode(head));
    edit.append(a, span("ui-eq__op", "="));
  }
  edit.append(expr(line.식, h, "sym").node);
  const bad = h.marks.get(head);
  if (bad) {
    edit.dataset.bad = "1";
    edit.title = bad;
  }
  left.append(edit);
  const right = el("div", {
    className: "fdoc__cell fdoc__valcell",
    attrs: { "data-line": String(i) },
  });
  const vexpr = span("fdoc__edit");
  vexpr.append(expr(line.식, h, "val").node);
  const got = vals(h)[head];
  right.append(span("ui-eq__op", "="), vexpr);
  // 수 하나 · 기호 하나(탄 갈래) 줄 = 값 한 번만(「= 1 = 1」 없음)
  let eff = tryParse(line.식);
  for (let pick = eff ? takenOf(eff, vals(h)) : 0; eff && pick; pick = takenOf(eff, vals(h)))
    eff = (eff as ["call", string, Node[]])[2][pick];
  const single = !!eff && (eff[0] === "num" || (eff[0] === "var" && vals(h)[eff[1]] === got));
  if (single) {
    /* 값 식이 곧 결과 */
  } else if (got !== null && got !== undefined && typeof got !== "object") {
    right.append(span("ui-eq__op", "="), valueNode(got, unitOf(head, h)));
  } else right.append(span("ui-eq__op", "="), span("fdoc__dash", "—"));
  if (h.admin) {
    const commitLine = (text: string): void => h.onLine(i, text);
    left.addEventListener("click", (ev) =>
      startEdit(edit, h, commitLine, { x: ev.clientX, y: ev.clientY }),
    );
    vexpr.addEventListener("click", (ev) =>
      onValueClick(ev, vexpr, h, "line", i, () =>
        startEdit(vexpr, h, (text) => h.onExpr(i, text), { x: ev.clientX, y: ev.clientY }),
      ),
    );
    if (h.auto?.kind === "line" && h.auto.i === i) startEdit(edit, h, commitLine);
  }
  return [left, right];
}

const unitOf = (id: string, h: LinesHooks): string =>
  h.vars.get(id)?.단위 || (h.doc.결과 === id ? (h.doc.결과단위 ?? "") : "");

function moneyRow(i: number, h: LinesHooks): HTMLElement[] {
  const line = (h.doc.금액 ?? [])[i];
  const got = (h.answer.줄 ?? [])[i] as
    { 비목?: Record<string, number>; 금액?: number | null; 까닭?: string } | undefined;
  const left = el("div", { className: "fdoc__cell fdoc__sym fdoc__money" });
  const name = span("fdoc__name", line.이름 || ft("Unnamed"));
  const price = span("fdoc__edit");
  price.append(expr(line.단가, h, "sym", true).node);
  const qty = span("fdoc__edit");
  const hasQty = line.수량 !== null && line.수량 !== undefined && line.수량 !== "";
  if (hasQty) qty.append(expr(line.수량, h, "sym", true).node);
  else qty.append(span("ui-eq__num", "1"));
  const times = span("ui-eq__op", "×");
  left.append(name, span("ui-eq__op", ":"), price);
  // 수량 없음 = 1(흐리게 — 눌러 수량을 씀 · 묶음 줄은 단가 × 수량이어야 셈)
  if (hasQty || h.admin) left.append(times, qty);
  if (!hasQty) [times, qty].forEach((x) => x.classList.add("is-ghost"));
  const bad = h.marks.get(line.이름 ?? "");
  if (bad) {
    left.dataset.bad = "1";
    left.title = bad;
  }
  if (h.admin) {
    const kind = createSelectField({
      options: KIND.map((k) => ({ value: k, text: k })),
      value: line.비목 ?? "노무비",
      compact: true,
      size: 22,
      ariaLabel: ft("Kind"),
      onChange: (v) => h.onMoney(i, { 비목: v }),
    });
    kind.root.classList.add("fdoc__kind");
    const drop = createIconButton({
      glyph: "✕",
      title: ft("Drop_Line"),
      size: 20,
      variant: "ghost",
      onClick: (ev) => {
        ev.stopPropagation();
        h.onMoney(i, null);
      },
    });
    drop.classList.add("fdoc__drop");
    left.prepend(kind.root);
    left.append(drop);
    name.addEventListener("click", () =>
      editName(name, line.이름 ?? "", (t) => h.onMoney(i, { 이름: t })),
    );
    const put = (slot: "단가" | "수량") => (text: string) => h.onMoney(i, { [slot]: text });
    price.addEventListener("click", (ev) =>
      startEdit(price, h, put("단가"), { x: ev.clientX, y: ev.clientY }),
    );
    qty.addEventListener("click", (ev) =>
      startEdit(qty, h, put("수량"), { x: ev.clientX, y: ev.clientY }),
    );
    if (h.auto?.kind === "price" && h.auto.i === i) startEdit(price, h, put("단가"));
    if (h.auto?.kind === "name" && h.auto.i === i)
      editName(name, "", (t) => h.onMoney(i, { 이름: t }));
  }
  const right = el("div", { className: "fdoc__cell fdoc__valcell fdoc__money" });
  const costs = line.비목 === "묶음" ? [...COSTS] : [null];
  const scope = moneyScope(h.answer.줄, i);
  for (const cost of costs) {
    const row = span("fdoc__mrow");
    if (cost) row.append(span("fdoc__cost", cost), span("ui-eq__op", ":"));
    const pv = span("fdoc__edit");
    pv.append(expr(line.단가, h, "val", true, cost ?? undefined, scope).node);
    row.append(pv);
    if (hasQty) {
      const qv = span("fdoc__edit");
      qv.append(expr(line.수량, h, "val", true, undefined, scope).node);
      row.append(span("ui-eq__op", "×"), qv);
      if (h.admin)
        qv.addEventListener("click", (ev) => onValueClick(ev, qv, h, "qty", i, () => undefined));
    }
    if (h.admin)
      pv.addEventListener("click", (ev) => onValueClick(ev, pv, h, "price", i, () => undefined));
    const amount = cost ? got?.비목?.[cost] : got?.금액;
    row.append(span("ui-eq__op", "="));
    if (typeof amount === "number") row.append(span("ui-eq__num fdoc__amount", eqText(amount)));
    else {
      const dash = span("fdoc__dash", "—");
      if (got?.까닭) dash.title = got.까닭;
      row.append(dash);
    }
    right.append(row);
  }
  return [left, right];
}

/** 이름 그 자리 고침(글만) */
function editName(node: HTMLElement, before: string, done: (text: string) => void): void {
  node.textContent = before;
  node.contentEditable = "true";
  node.dataset.editing = "1";
  let over = false;
  const finish = (keep: boolean): void => {
    if (over) return;
    over = true;
    node.contentEditable = "false";
    const text = (node.textContent ?? "").trim();
    if (keep && text !== before) done(text);
    else node.textContent = before || ft("Unnamed");
    delete node.dataset.editing;
  };
  node.addEventListener("keydown", (ev) => {
    if (ev.key === "Enter" || ev.key === "Escape") {
      ev.preventDefault();
      finish(ev.key === "Enter");
    }
  });
  node.addEventListener("blur", () => finish(true), { once: true });
  queueMicrotask(() => {
    node.focus();
    window.getSelection()?.selectAllChildren(node);
  });
}

function totalRow(label: string, b: Record<string, unknown> | null, cls: string): HTMLElement[] {
  const left = el("div", {
    className: `fdoc__cell fdoc__total ${cls}`,
    children: [span("fdoc__name", label)],
  });
  const right = el("div", { className: `fdoc__cell fdoc__total ${cls}` });
  for (const k of [...COSTS, "계"]) {
    const v = b?.[k];
    right.append(
      span("fdoc__tk", k),
      typeof v === "number" ? span("ui-eq__num fdoc__amount", eqText(v)) : span("fdoc__dash", "—"),
    );
  }
  return [left, right];
}

/** 식 줄 · 금액 줄 · 묶음 · 계 — 격자 칸 차례 */
export function buildLines(h: LinesHooks): HTMLElement[] {
  const out: HTMLElement[] = [];
  const add = (cells: HTMLElement[]): void => void out.push(...cells);
  const pair = (left: HTMLElement | null, right: HTMLElement | null): void =>
    add([left ?? el("div"), right ?? el("div")]);
  (h.doc.식 ?? []).forEach((_, i) => add(lineRow(i, h)));
  if (h.admin)
    pair(
      el("div", {
        className: "fdoc__cell",
        children: [button(ft("Add_Line"), h.onAddLine)],
      }),
      null,
    );
  const lines = h.doc.금액 ?? [];
  const groups: string[] = [];
  lines.forEach((l) => groups.includes(l.묶음 ?? "") || groups.push(l.묶음 ?? ""));
  const steps = lineMap(h.doc);
  const off = new Set(lines.flatMap((l, i) => (offLine(l, vals(h), steps) ? [i] : [])));
  const seen = (i: number): boolean => !!h.showOff || !off.has(i);
  const many = groups.length > 1;
  const bundles = (h.answer.묶음 ?? []) as Record<string, unknown>[];
  const done = h.answer.셈됨;
  groups.forEach((g, gi) => {
    if (!lines.some((l, i) => (l.묶음 ?? "") === g && seen(i))) return; // 다 꺼진 묶음
    if (many) {
      const head = span("fdoc__group", `${ORDER[gi] ?? gi + 1}. `);
      const label = span("fdoc__name", g || ft("Unnamed"));
      head.append(label);
      if (h.admin)
        label.addEventListener("click", () => editName(label, g, (t) => h.onGroupName(g, t)));
      add([el("div", { className: "fdoc__cell fdoc__grouphead", children: [head] })]); // 두 칸 걸침
    }
    lines.forEach((l, i) => (l.묶음 ?? "") === g && seen(i) && add(moneyRow(i, h)));
    if (h.admin && lines.length)
      pair(
        el("div", {
          className: "fdoc__cell",
          children: [button(ft("Add_Money"), () => h.onAddMoney(g))],
        }),
        null,
      );
    if (many) add(totalRow(ft("Subtotal"), done ? (bundles[gi] ?? null) : null, "is-sub"));
  });
  if (h.admin && !lines.length)
    pair(
      el("div", {
        className: "fdoc__cell",
        children: [button(ft("Add_Money"), () => h.onAddMoney(""))],
      }),
      null,
    );
  if (h.admin && lines.length) {
    const kids = [button(ft("Add_Group"), () => h.onAddMoney(ft("New_Group")))];
    if (off.size && h.onShowOff)
      kids.push(button(`${h.showOff ? ft("Hide_Off") : ft("Show_Off")} ${off.size}`, h.onShowOff));
    pair(el("div", { className: "fdoc__cell", children: kids }), null);
  }
  if (lines.length) {
    const sum = done ? (h.answer as unknown as Record<string, unknown>) : null;
    add(totalRow(many ? ft("Total") : ft("Sum"), sum, "is-end"));
  }
  return out;
}

const button = (label: string, onClick: () => void): HTMLElement => {
  const b = createButton({ label, variant: "ghost", size: 24, onClick });
  b.classList.add("fdoc__add");
  return b;
};