/* =============================================================================
 * M01_MasterData_UI_Matset.ts
 * 자재 조합 화면 — 왼쪽 컨테이너(찾기) / 오른쪽 목록 · 상세 (일위대가 조합 화면과 같은 틀)
 * 상세 = 이름 · 비고 + 본뜬키 줄 + 담은 자재 표(코드 · 이름 · 규격 · 단위 · 빼기) + [자재 더하기]
 * 저장 · 지우기는 서버 자재 조합 마스터(`자재조합.json` · 키 UM) — 길은 `Matset_Api` 한 곳
 * ========================================================================== */

import {
  createButton,
  createInputField,
  el,
  showConfirmDialog,
  showToast,
} from "@ui/ui_template_elements";
import { searchMaterials } from "./M01_MasterData_Api_Fetch";
import { ApiError } from "./M01_MasterData_UI_Logic_Api";
import {
  deleteMatset,
  editMatset,
  fetchMatset,
  fetchMatsets,
  newMatset,
  type MatItem,
  type Matset,
  type MatsetSummary,
} from "./M01_MasterData_UI_Matset_Api";
import { tm } from "./M01_MasterData_UI_Matset_Text";
import type { SideHandle } from "./M01_MasterData_UI_Side";
import "./M01_MasterData_UI_Logic_Style.css";
import "./M01_MasterData_UI_LogicLab_Style.css";

const blank = (): Matset => ({
  키: "",
  이름: "",
  담은자재: [],
  본뜬키: null,
  소유: "현장",
  비고: null,
});

/** 서버가 준 까닭 — 422 · 409(지우기 막음) 는 글 목록 · 409 낡은 판본은 stale */
function reason(error: unknown): string {
  if (error instanceof ApiError && typeof error.detail === "object" && error.detail) {
    const d = error.detail as { errors?: string[]; stale?: string[] };
    if (d.errors) return d.errors.join(" / ");
    if (d.stale) return tm("Stale");
  }
  return error instanceof Error ? error.message : tm("Load_Failed");
}

const fail = (error: unknown): void =>
  showToast(error instanceof Error ? error.message : tm("Load_Failed"), "error");

/** [자재 더하기] 창 — 낱말로 자재DB 를 찾아 하나씩 고름 */
function openMaterialPicker(have: Set<string>, done: (item: MatItem) => void): void {
  const search = createInputField({ type: "search", placeholder: tm("Pick_Search") });
  const list = el("div", { className: "m01-logic__pick-list" });
  const hint = el("p", { className: "m01-logic__muted", text: tm("Pick_Hint") });
  const close = (): void => backdrop.remove();
  const find = async (): Promise<void> => {
    try {
      const found = await searchMaterials(search.input.value.trim());
      hint.textContent = found.length ? String(found.length) : tm("Pick_None");
      list.replaceChildren(
        ...found.map((x) => {
          const taken = have.has(x.코드);
          const row = el("button", {
            className: "m01-logic__pick-row m01-logic__pick-row--button",
            attrs: { type: "button", "data-pick": x.코드, ...(taken ? { disabled: "" } : {}) },
            children: [
              el("div", {
                className: "m01-logic__stack",
                children: [
                  el("strong", { text: x.이름 }),
                  el("span", { className: "m01-logic__muted", text: `${x.코드} · ${x.규격}` }),
                ],
              }),
              el("span", { text: taken ? tm("Pick_Have") : x.단위 }),
            ],
          });
          row.addEventListener("click", () => {
            close();
            done(x);
          });
          return row;
        }),
      );
    } catch (error) {
      fail(error);
    }
  };
  search.input.addEventListener("keydown", (ev) => ev.key === "Enter" && void find());
  const dialog = el("div", {
    className: "m01-logic__pick",
    attrs: { role: "dialog", "aria-label": tm("Pick_Title") },
    children: [
      el("div", {
        className: "m01-logic__section-head",
        children: [
          el("h3", { text: tm("Pick_Title") }),
          createButton({ label: tm("Pick_Close"), variant: "ghost", onClick: close }),
        ],
      }),
      el("div", {
        className: "m01-logic__filters",
        children: [
          search.root,
          createButton({ label: tm("Pick_Find"), variant: "filled", onClick: () => void find() }),
        ],
      }),
      hint,
      list,
    ],
  });
  const backdrop = el("div", { className: "m01-logic__backdrop", children: [dialog] });
  backdrop.addEventListener("click", (ev) => ev.target === backdrop && close());
  backdrop.addEventListener("keydown", (ev) => ev.key === "Escape" && close());
  document.body.append(backdrop);
  search.input.focus();
}

export interface MatsetHandle {
  /** 컨테이너를 펼칠 때 — 목록을 새로 받아 그림 */
  show: () => Promise<void>;
}

export function mountM01Matset(host: HTMLElement, side: SideHandle): MatsetHandle {
  let items: MatsetSummary[] = [];
  let q = "";
  /** 화면을 바꾼 횟수 — 늦게 온 답은 이 값이 달라졌으면 버림 */
  let nav = 0;
  /** 열어 둔 상세 — 다른 화면에 갔다 와도 그대로 돌아오게 기억 */
  let current: { matset: Matset; version: string } | null = null;
  const view = el("div", { className: "m01-logic__editor" });
  host.replaceChildren(view);

  const find = createInputField({ type: "search", placeholder: tm("Search") });
  find.input.addEventListener("input", () => {
    q = find.input.value.trim().toLowerCase();
    if (!current) drawList();
  });
  side.matsetHost.replaceChildren(find.root);

  const load = async (redraw = true): Promise<void> => {
    const my = nav;
    try {
      items = await fetchMatsets();
    } catch (error) {
      fail(error);
    }
    if (redraw && my === nav) drawList();
  };

  const show = async (): Promise<void> => {
    if (!items.length && !current) {
      view.replaceChildren(el("p", { className: "m01-logic__muted", text: tm("Loading") }));
    }
    await load(false);
    if (current) draw(current.matset, current.version);
    else drawList();
  };

  /* --- 목록 --- */
  const drawList = (): void => {
    nav++;
    current = null;
    const shown = items.filter((x) => !q || `${x.키} ${x.이름}`.toLowerCase().includes(q));
    const heads = [
      tm("Head_Key"),
      tm("Head_Name"),
      tm("Head_Count"),
      tm("Head_Origin"),
      tm("Head_Owner"),
    ];
    const rows = shown.map((x) => {
      const tr = el("tr", {
        className: "m01-master__table-row",
        attrs: { "data-matset-key": x.키 },
        children: [x.키, x.이름, String(x.count), x.본뜬키 ?? tm("Origin_Self"), x.소유 ?? ""].map(
          (v) => el("td", { text: v }),
        ),
      });
      tr.addEventListener("click", () => void open(x.키));
      return tr;
    });
    view.replaceChildren(
      el("div", {
        className: "m01-logic__section-head",
        children: [
          createButton({ label: tm("New"), variant: "filled", onClick: () => draw(blank(), "") }),
        ],
      }),
      shown.length
        ? el("div", {
            className: "m01-master__grid-wrap",
            children: [
              el("table", {
                className: "m01-master__grid",
                children: [
                  el("thead", {
                    children: [el("tr", { children: heads.map((t) => el("th", { text: t })) })],
                  }),
                  el("tbody", { children: rows }),
                ],
              }),
            ],
          })
        : el("p", { className: "m01-logic__muted", text: tm("Empty") }),
    );
  };

  const open = async (key: string): Promise<void> => {
    try {
      const my = ++nav;
      const one = await fetchMatset(key);
      if (my !== nav) return;
      draw(one.matset, one.version);
    } catch (error) {
      fail(error);
    }
  };

  /* --- 상세 --- */
  const draw = (matset: Matset, version: string): void => {
    nav++;
    current = { matset, version };
    const field = (label: string, name: "이름" | "비고") => {
      const f = createInputField({ type: "text", label });
      f.input.value = matset[name] ?? "";
      f.input.setAttribute("data-matset-field", name);
      f.input.addEventListener("input", () => {
        if (name === "이름") matset.이름 = f.input.value;
        else matset.비고 = f.input.value || null;
      });
      return f.root;
    };
    const table = el("div", { className: "m01-master__grid-wrap" });
    const drawTable = (): void => {
      const trs = matset.담은자재.map((m, i) =>
        el("tr", {
          attrs: { "data-matset-item": m.코드 },
          children: [
            el("td", { text: m.코드 }),
            el("td", { text: m.이름 }),
            el("td", { text: m.규격 }),
            el("td", { text: m.단위 }),
            el("td", {
              children: [
                createButton({
                  label: tm("Remove"),
                  variant: "ghost",
                  size: "sm",
                  onClick: () => {
                    matset.담은자재.splice(i, 1);
                    drawTable();
                  },
                }),
              ],
            }),
          ],
        }),
      );
      const heads = [
        tm("Col_Code"),
        tm("Col_Name"),
        tm("Col_Spec"),
        tm("Col_Unit"),
        tm("Col_Move"),
      ];
      table.replaceChildren(
        el("table", {
          className: "m01-master__grid",
          children: [
            el("thead", {
              children: [el("tr", { children: heads.map((t) => el("th", { text: t })) })],
            }),
            el("tbody", { children: trs }),
          ],
        }),
        ...(trs.length ? [] : [el("p", { className: "m01-logic__muted", text: tm("NoItem") })]),
      );
    };
    drawTable();

    const add = createButton({
      label: tm("AddItem"),
      variant: "filled",
      onClick: () =>
        openMaterialPicker(new Set(matset.담은자재.map((m) => m.코드)), (x) => {
          matset.담은자재.push({ 코드: x.코드, 이름: x.이름, 규격: x.규격, 단위: x.단위 });
          drawTable();
        }),
    });
    const save = createButton({
      label: tm("Save"),
      variant: "filled",
      onClick: async () => {
        if (!matset.이름.trim()) return showToast(tm("NeedName"), "error");
        if (!matset.담은자재.length) return showToast(tm("NeedItem"), "error");
        const my = nav;
        try {
          const key = matset.키 ? matset.키 : (await newMatset(matset)).key;
          if (matset.키) await editMatset(matset.키, version, matset);
          showToast(tm("Saved"), "success");
          await load(false);
          if (my !== nav) {
            if (current?.matset === matset) current = null; // 저장 사이에 나감 — 옛 판본을 붙들지 않음
            return;
          }
          await open(key);
        } catch (error) {
          showToast(reason(error), "error");
        }
      },
    });
    const remove = createButton({
      label: tm("Delete"),
      variant: "ghost",
      onClick: async () => {
        if (!matset.키 || !(await showConfirmDialog(tm("DeleteAsk")))) return;
        try {
          await deleteMatset(matset.키, version);
          showToast(tm("Deleted"), "success");
          await load();
        } catch (error) {
          showToast(reason(error), "error");
        }
      },
    });
    const back = createButton({ label: "←", variant: "ghost", onClick: () => drawList() });
    view.replaceChildren(
      el("div", {
        className: "m01-logic__section-head",
        children: [back, el("h3", { text: matset.키 || tm("New") }), remove, save],
      }),
      el("section", {
        className: "m01lab__box m01-logic__section",
        children: [
          el("div", {
            className: "m01lab__info",
            children: [
              field(tm("Head_Name"), "이름"),
              field(tm("Head_Note"), "비고"),
              el("p", {
                className: "m01-logic__muted",
                text: `${tm("Head_Origin")}: ${matset.본뜬키 ?? tm("Origin_Self")}`,
                attrs: { "data-matset-origin": matset.본뜬키 ?? "" },
              }),
            ],
          }),
        ],
      }),
      el("section", {
        className: "m01lab__box m01-logic__section",
        children: [
          el("div", {
            className: "m01-logic__section-head",
            children: [el("h3", { text: tm("Items_Title") }), add],
          }),
          table,
        ],
      }),
    );
  };

  return { show };
}