/* =============================================================================
 * ui_template_item_picker_edit.ts
 * 항목 고르기 모달의 **편집 화면**(계획서 25-2d) — 카드 [수정] 이 모달 안에서 이 화면으로 바뀜.
 * 도면 = M02 CAD 부품 · 면적산출 · 재료산출 = M02 스프레드시트 · 선택 입력 = 값 받기 카드.
 * 고침은 **프로젝트 복사본**에만 씀(`ProjectItems.write`) — 마스터 · 회사 · 개인 원본은 안 바뀜.
 * [뒤로] = 선택지(나무 + 카드)로 · 저장 안 한 고침이 있으면 버릴지 물음.
 * 편집 부품은 이 화면을 열 때만 `import()`(B05 · B06 번들에 안 섞임).
 * ========================================================================== */

import { createButton, el, showConfirmDialog, showToast } from "./ui_template_elements";
import type { SpreadsheetHandle, Workbook } from "../A00_Common/spreadsheet/spreadsheet";
import type { LinkOptions } from "../A00_Common/spreadsheet/spreadsheet_links";
import type { DrawingTemplateHandle } from "../M02_MasterTemplete/M02_MasterTemplete_Drawing";
import type { InputsValueHandle } from "../M02_MasterTemplete/M02_MasterTemplete_Inputs";
import { pillsOf, type ValueDoc } from "../M02_MasterTemplete/M02_MasterTemplete_Inputs_Model";
import type { InputLinks, StructureDoc } from "../M02_MasterTemplete/M02_MasterTemplete_Api_Fetch";
import type { EditRequest } from "./ui_template_item_picker_detail";
import { itemName } from "./ui_template_item_picker_data";
import { loadInputs, PART_OF } from "./ui_template_item_picker_project";

export interface EditView {
  root: HTMLElement;
  /** 붙인 뒤 부름 — 편집 부품을 받아 세움 */
  start: () => void;
  isDirty: () => boolean;
  /** 저장 안 한 고침을 버릴지 묻고, 괜찮으면 부품을 치움 — false 면 그대로 */
  leave: () => Promise<boolean>;
  destroy: () => void;
}

const TEXT = {
  back: "← 뒤로",
  save: "저장",
  saved: "프로젝트 복사본에 저장했음",
  saveFailed: "저장하지 못함 — {value}",
  loadFailed: "복사본을 못 읽음 — {value}",
  discard: "저장 안 한 고침이 있음 — 버리고 돌아갈까요?",
  outOfRange: "범위 밖 값이 있어 저장하지 못함",
  noAreaPill:
    "면적산출 알약 없음 — 선택 입력에서 자리를 면적산출로 이으면 여기 뜸(마스터 · 회사 · 개인 층에서)",
  drawing: "도면",
  area: "면적산출",
  material: "재료산출",
  inputs: "선택 입력",
  suffix: "{value} 수정",
};

const why = (error: unknown): string => (error instanceof Error ? error.message : String(error));
const fill = (text: string, value: string): string => text.replace("{value}", value);

export function createEditView(req: EditRequest, onBack: (saved: boolean) => void): EditView {
  const { kind, row, info, items } = req;
  let dirty = false;
  let saving = false;
  let saved = false; // 한 번이라도 저장했나 — 돌아갈 때 「고침 있음」 표시
  let doc: unknown = null;
  let drawing: DrawingTemplateHandle | null = null;
  let sheet: SpreadsheetHandle | null = null;
  let card: InputsValueHandle | null = null;

  const word = {
    structure: TEXT.drawing,
    area: TEXT.area,
    material: TEXT.material,
    inputs: TEXT.inputs,
  }[kind];
  const back = createButton({ label: TEXT.back, variant: "ghost", size: "sm" });
  const save = createButton({ label: TEXT.save, variant: "filled", size: "sm" });
  save.disabled = true;
  const note = el("span", { className: "ui-item-picker__edit-note" });
  const body = el("div", { className: "ui-item-picker__edit-body" });
  const root = el("div", {
    className: "ui-item-picker__edit",
    children: [
      el("div", {
        className: "ui-item-picker__edit-top",
        children: [
          back,
          el("h4", {
            className: "ui-item-picker__edit-title",
            text: `${itemName(row)} — ${fill(TEXT.suffix, word)}`,
          }),
          note,
          save,
        ],
      }),
      body,
    ],
  });

  const setDirty = (next: boolean): void => {
    dirty = next;
    save.disabled = !next || saving;
  };
  const fail = (text: string): void => {
    body.replaceChildren(el("p", { className: "ui-item-picker__hint", text }));
  };

  /** 복사본의 항목 연결 — 자리가 면적 · 재료인 입력이 그 시트 알약(25-1b · 키 모양은 `pillsOf`) */
  const linkOf = async (): Promise<InputLinks | null> =>
    (await items.read(info.폴더, "입력연결")) as InputLinks | null;

  async function sheetLinks(kindOf: "area" | "material"): Promise<LinkOptions> {
    const [list, link, { searchMaterials }] = await Promise.all([
      loadInputs(row),
      linkOf(),
      import("../M01_MasterData/M01_MasterData_Api_Fetch"),
    ]);
    const 항목 = pillsOf(list, link, kindOf === "area" ? "면적" : "재료");
    if (kindOf === "area") {
      if (!항목.length) note.textContent = TEXT.noAreaPill;
      return { 항목, 모드: "입력" };
    }
    return { 항목, 모드: "자재", 자재찾기: searchMaterials };
  }

  async function mountSheet(kindOf: "area" | "material"): Promise<void> {
    const [{ createSpreadsheet }, links] = await Promise.all([
      import("../A00_Common/spreadsheet/spreadsheet"),
      sheetLinks(kindOf),
    ]);
    const host = el("div", { className: "ui-item-picker__edit-sheet" });
    body.replaceChildren(host);
    sheet = createSpreadsheet(host, doc as Workbook, {
      readOnly: false,
      tabs: false,
      onChange: () => setDirty(true),
      links,
    });
  }

  async function mountDrawing(): Promise<void> {
    const { mountDrawingTemplate } =
      await import("../M02_MasterTemplete/M02_MasterTemplete_Drawing");
    const host = el("div", { className: "ui-item-picker__edit-cad" });
    body.replaceChildren(host);
    drawing = mountDrawingTemplate(host, (doc as StructureDoc).도면 as never, {
      onSave: () => void doSave(),
      readOnly: false,
      name: `item:${info.폴더}`,
      layer: "project",
      projectId: req.projectId,
      onChanged: (changed) => setDirty(changed),
      originMarker: true,
      noArea: true,
    });
  }

  async function mountInputs(): Promise<void> {
    const [{ createInputsValueCard }, list, link] = await Promise.all([
      import("../M02_MasterTemplete/M02_MasterTemplete_Inputs"),
      loadInputs(row),
      linkOf(),
    ]);
    const values = ((await items.read(info.폴더, "입력값")) as ValueDoc | null) ?? {};
    card = createInputsValueCard({ mode: "value", onChange: () => setDirty(true) });
    card.set({ list, link, values });
    body.replaceChildren(
      el("div", { className: "ui-item-picker__edit-inputs", children: [card.root] }),
    );
  }

  async function start(): Promise<void> {
    try {
      if (kind !== "inputs") {
        doc = await items.read(info.폴더, PART_OF[kind]);
        if (doc == null) return fail(fill(TEXT.loadFailed, "복사본에 없음"));
      }
      if (kind === "structure") await mountDrawing();
      else if (kind === "inputs") await mountInputs();
      else await mountSheet(kind);
    } catch (error) {
      fail(fill(TEXT.loadFailed, why(error)));
    }
  }

  async function doSave(): Promise<void> {
    if (saving) return;
    saving = true;
    save.disabled = true;
    try {
      if (kind === "inputs") {
        if (!card?.isValid()) return void showToast(TEXT.outOfRange, "error");
        await items.write(info.폴더, "입력값", card.getValues());
      } else if (kind === "structure") {
        const edited = await drawing?.getDoc();
        await items.write(info.폴더, "도면", { ...(doc as StructureDoc), 도면: edited });
      } else if (sheet) {
        // 번호 칸은 스프레드시트가 모름 — 읽은 문서 위에 편집본을 얹음(M02 저장과 같은 규칙)
        const merged = { ...(doc as Record<string, unknown>), ...sheet.getDoc() };
        await items.write(info.폴더, PART_OF[kind], merged);
        doc = merged;
      }
      setDirty(false);
      saved = true;
      showToast(TEXT.saved, "success");
    } catch (error) {
      showToast(fill(TEXT.saveFailed, why(error)), "error");
    } finally {
      saving = false;
      save.disabled = !dirty;
    }
  }

  const destroy = (): void => {
    drawing?.destroy();
    sheet?.destroy();
    drawing = null;
    sheet = null;
    root.remove();
  };
  const leave = async (): Promise<boolean> => !dirty || showConfirmDialog(TEXT.discard);

  save.addEventListener("click", () => void doSave());
  back.addEventListener("click", async () => {
    if (await leave()) onBack(saved);
  });

  return { root, start: () => void start(), isDirty: () => dirty, leave, destroy };
}