/* =============================================================================
 * M02_MasterTemplete_UI_Side.ts
 * 마스터 템플릿 좌측 패널 — 시스템 양식 목록(표/도면) · 새로 · 본떠 · 지우기. 서버 길은 계약 `6_계약.md`.
 * ========================================================================== */

import {
  createButton,
  createInputField,
  createSelectField,
  el,
  showConfirmDialog,
  showToast,
} from "@ui/ui_template_elements";
import { t as L } from "@ui/ui_template_locale";
import { openModal } from "@ui/ui_template_modal";
import {
  deleteTemplate,
  listTemplates,
  readTemplate,
  saveTemplate,
  StaleError,
  type Kind,
  type TemplateInfo,
} from "./M02_MasterTemplete_Api_Fetch";
import { canEdit, type Selection } from "./M02_MasterTemplete_UI_Main";

const KINDS: { kind: Kind; label: () => string }[] = [
  { kind: "table", label: () => L("M02_KindTable") },
  { kind: "drawing", label: () => L("M02_KindDrawing") },
];
/** 새 양식의 첫 문서 — 표는 `3_표양식.md` 4장 틀 · 도면은 빈 웹캐드 문서 */
function stubDoc(kind: Kind, name: string): unknown {
  return kind === "table"
    ? {
        양식: name,
        종류: "표",
        판: 1,
        층: ["종류", "공법", "규격"],
        열: [{ id: "sta", 머리: ["측점", null, null], 단위: null, 꼴: "글", 고정: true }],
        줄: [],
        합계줄: [],
        보기: {},
      }
    : { format: 6, entities: [] };
}

export interface SideOptions {
  isAdmin: boolean;
  onOpen: (sel: Selection | null) => void;
  getOpen: () => Selection | null;
  /** 저장 안 한 고침을 버릴지 확인 — 취소면 false */
  confirmLeave: () => Promise<boolean>;
}

export interface SideHandle {
  root: HTMLElement;
  refresh: () => Promise<void>;
}

/** 서버 이름 규칙과 같게 — 화면에서 먼저 막음 */
const badName = (name: string): boolean =>
  /[\\/:*?"<>|\x00-\x1f]|\.\./.test(name) || name.startsWith(".");

const why = (error: unknown): string => (error instanceof Error ? error.message : "");
const failed = (error: unknown): void =>
  showToast(L("M02_ActionFailed").replace("{value}", why(error)), "error");

export function buildSide(opt: SideOptions): SideHandle {
  const layer = "system" as const;
  let items: TemplateInfo[] = [];
  let seq = 0;

  const listHost = el("div", { className: "m02-side__lists" });

  const btnNew = createButton({ label: L("M02_New"), variant: "filled" });
  const btnCopy = createButton({ label: L("M02_Copy"), variant: "ghost" });
  const btnDel = createButton({ label: L("M02_Delete"), variant: "danger" });
  const editRow = el("div", { className: "m02-side__row", children: [btnNew, btnCopy, btnDel] });

  const root = el("div", { className: "m02-side", children: [listHost, editRow] });

  const isOpen = (info: TemplateInfo): boolean => {
    const cur = opt.getOpen();
    return !!cur && cur.layer === layer && cur.kind === info.종류 && cur.name === info.이름;
  };

  const currentInfo = (): TemplateInfo | undefined => {
    const cur = opt.getOpen();
    return cur ? items.find((i) => i.종류 === cur.kind && i.이름 === cur.name) : undefined;
  };

  function paintList(): void {
    listHost.replaceChildren(
      ...KINDS.map(({ kind, label }) => {
        const mine = items.filter((i) => i.종류 === kind);
        return el("div", {
          className: "m02-side__group",
          children: [
            el("h4", { text: label() }),
            ...(mine.length
              ? mine.map((info) => {
                  const b = el("button", {
                    className: `m02-side__item${isOpen(info) ? " is-active" : ""}`,
                    text: info.이름,
                    attrs: { type: "button", title: info.수정일 },
                  });
                  b.addEventListener("click", () => void select(info));
                  return b;
                })
              : [el("p", { className: "m02-side__empty", text: L("M02_NoTemplates") })]),
          ],
        });
      }),
    );
  }

  function paintButtons(): void {
    const editable = canEdit(layer, opt.isAdmin);
    btnNew.disabled = !editable;
    btnCopy.disabled = !editable || !currentInfo();
    btnDel.disabled = !editable || !currentInfo();
  }

  async function select(info: TemplateInfo): Promise<void> {
    if (!isOpen(info) && !(await opt.confirmLeave())) return;
    opt.onOpen({ layer, projectId: null, kind: info.종류, name: info.이름 });
    paintList();
    paintButtons();
  }

  async function refresh(): Promise<void> {
    const mine = ++seq;
    paintButtons();
    try {
      items = await listTemplates(layer, null);
    } catch (error) {
      items = [];
      showToast(L("M02_LoadFailed").replace("{value}", why(error)), "error");
    }
    if (mine !== seq) return;
    paintList();
    paintButtons();
  }

  /* --- 시스템 층 새로 · 본떠 · 지우기 --- */
  const nameDialog = (
    title: string,
    withKind: boolean,
    onOk: (kind: Kind, name: string) => Promise<void>,
  ): void => {
    const name = createInputField({ label: L("M02_Name"), placeholder: L("M02_Name") });
    const kind = createSelectField({
      label: L("M02_Kind"),
      options: KINDS.map((k) => ({ value: k.kind, text: k.label() })),
    });
    openModal({
      title,
      closeLabel: L("M02_Close"),
      dialogClass: "m02-modal",
      mount: (body, close) => {
        const ok = createButton({ label: L("M02_Create"), variant: "filled" });
        ok.addEventListener("click", async () => {
          const text = name.input.value.trim();
          if (!text) return showToast(L("M02_NameNeeded"), "error");
          if (badName(text)) return showToast(L("M02_BadName"), "error");
          ok.disabled = true; // 연달아 눌러도 한 번만
          try {
            await onOk(kind.select.value as Kind, text);
            close();
          } catch (error) {
            if (error instanceof StaleError) showToast(L("M02_NameExists"), "error");
            else failed(error);
          } finally {
            ok.disabled = false;
          }
        });
        body.append(...(withKind ? [kind.root] : []), name.root, ok);
        name.input.focus();
      },
    });
  };

  const openCreated = async (kind: Kind, name: string): Promise<void> => {
    showToast(L("M02_Created"), "success");
    await refresh();
    const info = items.find((i) => i.종류 === kind && i.이름 === name);
    if (info) await select(info);
  };

  btnNew.addEventListener("click", () =>
    nameDialog(L("M02_NewTitle"), true, async (kind, name) => {
      await saveTemplate("system", kind, name, null, "", stubDoc(kind, name));
      await openCreated(kind, name);
    }),
  );
  btnCopy.addEventListener("click", () => {
    const from = currentInfo();
    if (!from) return;
    nameDialog(L("M02_CopyTitle"), false, async (_kind, name) => {
      const got = await readTemplate("system", from.종류, from.이름, null);
      await saveTemplate("system", from.종류, name, null, "", got.문서);
      await openCreated(from.종류, name);
    });
  });
  btnDel.addEventListener("click", async () => {
    await refresh(); // 저장 직후여도 최신 판으로
    const info = currentInfo();
    if (!info) return;
    if (!(await showConfirmDialog(L("M02_DeleteConfirm").replace("{value}", info.이름)))) return;
    try {
      await deleteTemplate(info.종류, info.이름, info.판);
      showToast(L("M02_Deleted"), "success");
      opt.onOpen(null);
      await refresh();
    } catch (error) {
      failed(error);
    }
  });

  void refresh();
  return { root, refresh };
}