/* =============================================================================
 * M01_MasterData_UI_Logic_Wizard_Atom.ts
 * 값 하나를 고르는 칸 — 직접 값 / 설계 입력 / 표에서 찾기 / 다른 로직 부르기
 * 수량 · 조건 나누기의 각 갈래가 같이 씀 · 고른 것은 넘겨받은 Atom 에 바로 씀(식은 Model 이 조립)
 * ========================================================================== */

import { createInputField, createSelectField, el, showToast } from "@ui/ui_template_elements";
import {
  fetchTableFull,
  searchLogics,
  type LogicBrief,
  type TableBrief,
} from "./M01_MasterData_UI_Logic_Wizard_Api";
import { condChoices, tableInfo, type Atom } from "./M01_MasterData_UI_Logic_Wizard_Model";
import { tw } from "./M01_MasterData_UI_Logic_Wizard_Text";

type Option = { value: string; text: string };

export const select = (
  options: Option[],
  value: string,
  onChange: (v: string) => void,
  label?: string,
): HTMLElement => createSelectField({ options, value, onChange, compact: true, label }).root;

export const textBox = (
  value: string,
  placeholder: string,
  onInput: (v: string) => void,
  label?: string,
): HTMLElement => createInputField({ value, placeholder, onInput, label, type: "text" }).root;

/** 원자를 통째로 바꿔 씀(다른 갈래로 옮길 때) */
function reset(atom: Atom, next: Atom): void {
  for (const k of Object.keys(atom)) delete (atom as unknown as Record<string, unknown>)[k];
  Object.assign(atom, next);
}

const fresh = (kind: Atom["kind"]): Atom =>
  kind === "value"
    ? { kind, value: "" }
    : kind === "input"
      ? { kind, name: "" }
      : kind === "logic"
        ? { kind, key: "", args: "" }
        : { kind, table: "", col: "", cond: {} };

/**
 * `tables` = 원문 절 단계에서 고른 표 · `onChange` = 고른 것이 바뀔 때마다
 * `kinds` = 이 자리에서 고를 수 있는 갈래(기본 넷 다)
 */
export function atomEditor(
  atom: Atom,
  tables: TableBrief[],
  onChange: () => void,
  kinds: Atom["kind"][] = ["value", "table", "input", "logic"],
): HTMLElement {
  const host = el("div", { className: "m01w__atom" });
  const body = el("div", { className: "m01w__atom-body" });
  const names: Record<Atom["kind"], string> = {
    value: tw("Qty_Value"),
    table: tw("Qty_Table"),
    input: tw("Qty_Input"),
    logic: tw("Qty_Logic"),
  };

  const draw = (): void => {
    body.replaceChildren();
    if (atom.kind === "value") body.append(valueBox(atom, onChange));
    else if (atom.kind === "input") body.append(inputBox(atom, onChange));
    else if (atom.kind === "logic") body.append(logicBox(atom, onChange));
    else body.append(tableBox(atom, tables, onChange));
  };

  host.append(
    select(
      kinds.map((k) => ({ value: k, text: names[k] })),
      atom.kind,
      (v) => {
        reset(atom, fresh(v as Atom["kind"]));
        draw();
        onChange();
      },
    ),
    body,
  );
  draw();
  return host;
}

function valueBox(atom: Extract<Atom, { kind: "value" }>, onChange: () => void): HTMLElement {
  return textBox(atom.value, tw("Qty_Number_Ph"), (v) => {
    atom.value = v;
    onChange();
  });
}

function inputBox(atom: Extract<Atom, { kind: "input" }>, onChange: () => void): HTMLElement {
  return textBox(atom.name, tw("Qty_Name"), (v) => {
    atom.name = v.trim();
    onChange();
  });
}

function logicBox(atom: Extract<Atom, { kind: "logic" }>, onChange: () => void): HTMLElement {
  const list = el("div", { className: "m01w__found" });
  const key = createInputField({ value: atom.key, placeholder: tw("Qty_LogicKey"), type: "text" });
  key.input.addEventListener("input", () => {
    atom.key = key.input.value.trim();
    onChange();
  });
  const find = createInputField({ placeholder: tw("Line_Logic_Find"), type: "search" });
  let timer = 0;
  find.input.addEventListener("input", () => {
    window.clearTimeout(timer);
    timer = window.setTimeout(() => {
      const q = find.input.value.trim();
      if (!q) return list.replaceChildren();
      void searchLogics(q)
        .then((r) => showLogics(r.logics.slice(0, 8)))
        .catch((e: unknown) => showToast(e instanceof Error ? e.message : tw("Failed"), "error"));
    }, 250);
  });
  const showLogics = (found: LogicBrief[]): void => {
    list.replaceChildren(
      ...found.map((l) => {
        const row = el("button", {
          className: "m01w__row",
          attrs: { type: "button" },
          text: `${l.원문번호} ${l.이름} · ${l.결과단위} · ${l.키}`,
        });
        row.addEventListener("click", () => {
          atom.key = l.키;
          key.input.value = l.키;
          list.replaceChildren();
          onChange();
        });
        return row;
      }),
    );
  };
  const args = createInputField({
    value: atom.args,
    placeholder: tw("Qty_LogicArgs"),
    type: "text",
  });
  args.input.addEventListener("input", () => {
    atom.args = args.input.value;
    onChange();
  });
  return el("div", { className: "m01w__stack", children: [find.root, list, key.root, args.root] });
}

function tableBox(
  atom: Extract<Atom, { kind: "table" }>,
  tables: TableBrief[],
  onChange: () => void,
): HTMLElement {
  const host = el("div", { className: "m01w__stack" });
  const detail = el("div", { className: "m01w__stack" });
  const drawDetail = (): void => {
    const info = tableInfo.get(atom.table);
    detail.replaceChildren();
    if (!info) return;
    detail.append(
      select(
        [
          { value: "", text: "—" },
          ...Object.keys(info.값칸 ?? {}).map((c) => ({ value: c, text: c })),
        ],
        atom.col,
        (v) => {
          atom.col = v;
          onChange();
        },
        tw("Qty_Col"),
      ),
    );
    for (const cond of Object.keys(info.조건 ?? {})) detail.append(condRow(atom, cond, onChange));
  };
  const load = (key: string): void => {
    const brief = tables.find((t) => t.키 === key);
    if (!brief) return (drawDetail(), onChange());
    void fetchTableFull(brief.file, key)
      .then((full) => {
        tableInfo.set(key, full);
        for (const c of Object.keys(full.조건 ?? {})) atom.cond[c] ??= { ask: true };
        drawDetail();
        onChange();
      })
      .catch((e: unknown) => showToast(e instanceof Error ? e.message : tw("Failed"), "error"));
  };
  const choose = (key: string): void => {
    atom.table = key;
    atom.col = "";
    atom.cond = {};
    load(key);
  };
  host.append(
    select(
      [
        { value: "", text: "—" },
        ...tables.map((t) => ({ value: t.키, text: `${t.이름} · ${t.키}` })),
      ],
      atom.table,
      choose,
      tw("Qty_Table_Pick"),
    ),
    detail,
  );
  if (atom.table && !tableInfo.has(atom.table)) load(atom.table);
  else drawDetail();
  return host;
}

/** 표의 조건 칸 하나 — 설계자에게 물음 / 붙박이 값 */
function condRow(
  atom: Extract<Atom, { kind: "table" }>,
  cond: string,
  onChange: () => void,
): HTMLElement {
  atom.cond[cond] ??= { ask: true };
  const choices = condChoices(atom.table, cond);
  const value = el("div", { className: "m01w__inline" });
  const set = (v: string): void => {
    atom.cond[cond] = { ask: false, value: v };
    onChange();
  };
  const drawValue = (): void => {
    value.replaceChildren();
    const bind = atom.cond[cond];
    if (bind.ask) return;
    if (choices) {
      const now = bind.value || String(choices[0]);
      atom.cond[cond] = { ask: false, value: now };
      value.append(
        select(
          choices.map((c) => ({ value: String(c), text: String(c) })),
          now,
          set,
        ),
      );
    } else value.append(textBox(bind.value, tw("Qty_Number_Ph"), set));
  };
  const mode = select(
    [
      { value: "ask", text: tw("Qty_Ask") },
      { value: "fixed", text: tw("Qty_Fixed") },
    ],
    atom.cond[cond].ask ? "ask" : "fixed",
    (v) => {
      atom.cond[cond] = v === "ask" ? { ask: true } : { ask: false, value: "" };
      drawValue();
      onChange();
    },
  );
  drawValue();
  return el("div", {
    className: "m01w__inline",
    children: [el("strong", { text: cond }), mode, value],
  });
}