/* =============================================================================
 * M01_MasterData_UI_Logic_Page.ts
 * 관리자 화면 — 로직 칸. 가운데 일위대가표(호표) 고치기 / 오른쪽 시험 계산
 * 로직 목록(원문·장 고르기 · 찾기 · 막힘 거름)은 왼쪽 패널 「일위대가 로직」 컨테이너(`listHost`) 안
 *
 * 데이터 흐름(CLAUDE.md 5장) — 고친 것은 캐시(sessionStorage)에 쌓고 [저장] 한 번에 `POST /save`.
 * 409 = 그 사이 파일이 바뀜 · 422 = 검사 걸림(아무것도 안 씀) — 까닭은 서버 글 그대로 보임.
 * ========================================================================== */

import { t as L } from "@ui/ui_template_locale";
import {
  createButton,
  el,
  hideLoadingOverlay,
  showConfirmDialog,
  showLoadingOverlay,
  showToast,
} from "@ui/ui_template_elements";
import {
  ApiError,
  copyLogic,
  fetchLogic,
  fetchLogicFiles,
  fetchLogics,
  fetchLogicSubs,
  saveFiles,
  type CalcLine,
  type ElementBrief,
  type LogicFile,
  type LogicRow,
  type LogicSummary,
  type SaveFile,
} from "./M01_MasterData_UI_Logic_Api";
import { buildCalc } from "./M01_MasterData_UI_Logic_Calc";
import { buildEditor } from "./M01_MasterData_UI_Logic_Edit";
import { isOwnLogic, mountFlow } from "./M01_MasterData_UI_Logic_Flow";
import { buildList, logicId, type ListItem, type ListMark } from "./M01_MasterData_UI_Logic_List";
import { openLogicWizard } from "./M01_MasterData_UI_Logic_Wizard";
import { openPicker } from "./M01_MasterData_UI_Logic_Pick";
import type { SideHandle } from "./M01_MasterData_UI_Side";
import { tx } from "./M01_MasterData_UI_Logic_Text";
import "./M01_MasterData_UI_Logic_Style.css";

/** 저장 안 한 로직 하나 — origKey null = 새 로직 · row null = 지움 */
interface Draft {
  /** 구분(원문 + 부문) — 목록 id 를 세움 */
  sub: string;
  file: string;
  version: string;
  origKey: string | null;
  row: LogicRow | null;
}

interface Opened extends Draft {
  id: string;
  row: LogicRow | null;
  original: string | null;
  prices: Record<string, ElementBrief | null>;
  reasons: string[];
  lines: CalcLine[] | null;
  values: Record<string, string>;
}

const CACHE_KEY = "m01_logic_drafts";
/** 기본 보기 = 흐름 그림 · 「고급」 = 옛 호표 표 + 시험 계산 칸 */
const VIEW_KEY = "m01.logic.view";
const clone = <T>(v: T): T => JSON.parse(JSON.stringify(v)) as T;

function loadDrafts(): Record<string, Draft> {
  try {
    return JSON.parse(sessionStorage.getItem(CACHE_KEY) ?? "{}") as Record<string, Draft>;
  } catch {
    return {};
  }
}

export interface LogicHandle {
  /** 밖(요소 화면)에서 이 키를 바로 엶 — 소요량·계수 표의 「쓰는 로직」 눌렀을 때. */
  openKey: (key: string) => Promise<void>;
}

export async function mountM01Logic(
  host: HTMLElement,
  side: SideHandle,
  openKey?: string,
): Promise<LogicHandle> {
  let drafts = loadDrafts();
  let files: LogicFile[] = [];
  let opened: Opened | null = null;
  let calcInputs = "";
  let view: "flow" | "advanced" =
    sessionStorage.getItem(VIEW_KEY) === "advanced" ? "advanced" : "flow";

  const editor = el("div", { className: "m01-logic__editor" });
  const errors = el("div", { className: "m01-logic__reasons", attrs: { hidden: "" } });
  const calc = el("aside", { className: "m01-logic__calc" });
  const filterHost = el("div");
  const pending = el("span", { className: "m01-logic__muted" });
  const list = buildList((item) => void open(item.id, item.sub, item.key));
  const back = createButton({ label: tx("Bar_Back"), variant: "ghost", onClick: () => show(null) });

  const persist = (): void => {
    try {
      sessionStorage.setItem(CACHE_KEY, JSON.stringify(drafts));
    } catch {
      /* 캐시가 막혀도 화면 안의 고친 것은 남음 */
    }
    const marks = new Map<string, ListMark>();
    const extra: ListItem[] = [];
    for (const [id, d] of Object.entries(drafts)) {
      marks.set(id, d.origKey === null ? "new" : d.row === null ? "deleted" : "edited");
      if (d.origKey === null && d.row) {
        extra.push({
          id,
          sub: d.sub,
          detail: "",
          key: d.row.키,
          number: d.row.원문번호,
          name: d.row.이름,
          unit: d.row.결과단위,
          source: d.row.출처,
          blocked: false,
          reasons: [],
        });
      }
    }
    list.setMarks(marks, extra);
    const n = Object.keys(drafts).length;
    pending.textContent = n ? tx("Bar_Pending", { n }) : "";
    saveButton.disabled = discardButton.disabled = n === 0;
  };

  const touch = (): void => {
    if (!opened?.row) return;
    const now = JSON.stringify(opened.row);
    if (opened.origKey !== null && now === opened.original) delete drafts[opened.id];
    else drafts[opened.id] = pick(opened, clone(opened.row));
    persist();
    if (view === "flow") return; // 흐름 그림은 제 안에서 다시 셈 — 다시 그리면 펼친 상자가 접힘
    const inputs = JSON.stringify(opened.row.입력 ?? []);
    if (inputs !== calcInputs) drawCalc();
  };

  const pick = (o: Opened, row: LogicRow | null): Draft => ({
    sub: o.sub,
    file: o.file,
    version: o.version,
    origKey: o.origKey,
    row,
  });

  const drawCalc = (): void => {
    if (!opened?.row || view === "flow") {
      calc.replaceChildren();
      return;
    }
    const current = opened;
    calcInputs = JSON.stringify(current.row?.입력 ?? []);
    buildCalc(calc, {
      savedKey: current.origKey,
      file: current.file,
      row: current.row as LogicRow,
      dirty: () => current.id in drafts,
      values: current.values,
      onLines: (lines) => {
        current.lines = lines;
        drawEditor();
      },
    });
  };

  const drawEditor = (): void => {
    // 고른 로직이 없으면 목록 · 있으면 흐름 그림(기본) 또는 고급 = 호표 표 + 시험 계산
    const listing = !opened;
    list.root.hidden = !listing;
    editor.hidden = back.hidden = viewButton.hidden = listing;
    calc.hidden = listing || view === "flow";
    if (!opened) return;
    if (!opened.row) {
      editor.replaceChildren(
        el("p", { className: "m01-logic__empty", text: `● ${tx("List_Deleted")}` }),
      );
      return;
    }
    const current = opened;
    const shown = current.row as LogicRow;
    if (view === "flow") {
      mountFlow(editor, {
        one: {
          file: current.file,
          version: current.version,
          logic: shown,
          blocked: false,
          reasons: current.reasons,
          prices: current.prices,
        },
        row: shown,
        editable: isOwnLogic(current.file, shown),
        onChange: touch,
        onCopy: () => void onCopy(current),
      });
      return;
    }
    buildEditor(editor, {
      row: current.row as LogicRow,
      file: current.file,
      isNew: current.origKey === null,
      files: files.map((f) => f.file),
      reasons: current.reasons,
      prices: current.prices,
      lines: current.lines,
      onChange: touch,
      onFile: (file) => {
        const f = files.find((x) => x.file === file);
        if (!f) return;
        Object.assign(current, { file: f.file, sub: subOf(f), version: f.version });
        touch();
      },
      onPick: openPicker,
    });
  };

  /** 로직 파일 → 구분(원문 + 부문) — 「공통 03장 토공사」 의 앞말이 부문 */
  const subOf = (f: LogicFile): string =>
    f.book === "건설품셈" ? `${f.book} ${f.chapter.split(" ")[0]}` : String(f.book);

  const show = (next: Opened | null): void => {
    opened = next;
    errors.hidden = true;
    drawEditor();
    drawCalc();
  };

  const open = async (id: string, sub: string, key: string): Promise<void> => {
    const draft = drafts[id];
    if (draft?.origKey === null) {
      show({ ...draft, id, original: null, prices: {}, reasons: [], lines: null, values: {} });
      return;
    }
    try {
      const one = await fetchLogic(key);
      show({
        id,
        sub,
        file: draft?.file ?? one.file,
        version: draft?.version ?? one.version,
        origKey: key,
        row: draft ? (draft.row === null ? null : clone(draft.row)) : clone(one.logic),
        original: JSON.stringify(one.logic),
        prices: one.prices,
        reasons: one.reasons,
        lines: null,
        values: {},
      });
    } catch (error) {
      showToast(error instanceof Error ? error.message : tx("Load_Failed"), "error");
    }
  };

  let allLogics: LogicSummary[] = [];

  const reload = async (): Promise<void> => {
    const [logics, logicFiles, subs] = await Promise.all([
      fetchLogics(),
      fetchLogicFiles(),
      fetchLogicSubs(),
    ]);
    files = logicFiles;
    allLogics = logics;
    list.setItems(logics);
    // 왼쪽 「전체」 + 구분 → 상세구분 거름 — 고르면 목록으로 돌아와 그 범위만
    filterHost.replaceChildren(
      side.filter({
        id: "로직|",
        store: "m01.filter.로직",
        subs,
        total: list.total(),
        subLabel: L("M01_LaborSub"),
        detailLabel: L("M01_LaborDetail"),
        restore: true,
        onPick: (sub, detail) => {
          list.setPick(sub, detail);
          if (opened) show(null);
        },
      }),
    );
    persist();
  };

  /** 「새로 만들기」 모달 — 저장·본떠 저장이 끝나면 그 새 자체 로직을 흐름 그림으로 바로 엶 */
  const onNew = (): void =>
    openLogicWizard({
      onSaved: (key) =>
        void reload()
          .then(() => open(logicId("자체", key), "자체", key))
          .catch(failed),
    });

  /** 「본떠 만들기」 — 정본을 자체 파일로 복제하고(계약 5장) 그 새 로직을 바로 엶 */
  const onCopy = async (from: Opened): Promise<void> => {
    if (!from.origKey) return;
    showLoadingOverlay();
    try {
      const made = await copyLogic(from.origKey);
      await reload();
      showToast(tx("Edit_Copied", { v: made.key }), "success");
      await open(logicId("자체", made.key), "자체", made.key);
    } catch (error) {
      failed(error);
    } finally {
      hideLoadingOverlay();
    }
  };

  const onDelete = async (): Promise<void> => {
    if (!opened?.row) return;
    if (
      !(await showConfirmDialog(
        tx("Confirm_Delete", { v: opened.row.원문번호 || opened.row.키 }),
        tx("Bar_Delete"),
      ))
    )
      return;
    if (opened.origKey === null) {
      delete drafts[opened.id];
      persist();
      show(null);
      return;
    }
    drafts[opened.id] = pick(opened, null);
    opened.row = null;
    persist();
    show(opened);
  };

  const onDiscard = async (): Promise<void> => {
    if (!(await showConfirmDialog(tx("Confirm_Discard"), tx("Bar_Discard")))) return;
    drafts = {};
    persist();
    const was = opened;
    if (was && was.origKey !== null)
      await open(logicId(was.sub, was.origKey), was.sub, was.origKey);
    else show(null);
  };

  const onSave = async (): Promise<void> => {
    const byFile = new Map<string, SaveFile>();
    for (const d of Object.values(drafts)) {
      const part = byFile.get(d.file) ?? { file: d.file, version: d.version, changes: [] };
      if (d.origKey === null) {
        if (d.row) part.changes.push({ op: "add", row: d.row });
      } else if (d.row === null) part.changes.push({ op: "delete", key: d.origKey });
      else part.changes.push({ op: "edit", key: d.origKey, row: d.row });
      byFile.set(d.file, part);
    }
    if (!byFile.size) {
      showToast(tx("Save_Nothing"), "info");
      return;
    }
    showLoadingOverlay();
    try {
      await saveFiles([...byFile.values()]);
      const was = opened;
      drafts = {};
      await reload();
      showToast(tx("Save_Done"), "success");
      if (was?.row?.키) await open(logicId(was.sub, was.row.키), was.sub, was.row.키);
      else show(null);
    } catch (error) {
      failed(error);
    } finally {
      hideLoadingOverlay();
    }
  };

  const failed = (error: unknown): void => {
    const detail =
      error instanceof ApiError ? (error.detail as { stale?: string[]; errors?: string[] }) : null;
    if (error instanceof ApiError && error.status === 409) {
      showToast(tx("Save_Stale", { v: (detail?.stale ?? []).join(", ") }), "error");
    } else if (error instanceof ApiError && error.status === 422) {
      errors.replaceChildren(
        el("strong", { text: tx("Save_Errors") }),
        ...(detail?.errors ?? []).map((x) => el("div", { text: x })),
      );
      errors.hidden = false;
    } else {
      showToast(error instanceof Error ? error.message : tx("Save_Failed"), "error");
    }
  };

  const viewButton = createButton({
    label: tx("View_Advanced"),
    variant: "ghost",
    onClick: () => {
      view = view === "flow" ? "advanced" : "flow";
      try {
        sessionStorage.setItem(VIEW_KEY, view);
      } catch {
        /* 캐시가 막혀도 이 판 안에서는 바뀐 보기가 남음 */
      }
      viewButton.textContent = view === "flow" ? tx("View_Advanced") : tx("View_Flow");
      editor.replaceChildren();
      drawEditor();
      drawCalc();
    },
  });
  viewButton.textContent = view === "flow" ? tx("View_Advanced") : tx("View_Flow");
  const saveButton = createButton({ label: tx("Bar_Save"), onClick: () => void onSave() });
  const discardButton = createButton({
    label: tx("Bar_Discard"),
    variant: "ghost",
    onClick: () => void onDiscard(),
  });
  const bar = el("div", {
    className: "m01-logic__bar",
    children: [
      back,
      el("h2", { text: tx("Title") }),
      viewButton,
      pending,
      createButton({ label: tx("Bar_New"), variant: "ghost", onClick: onNew }),
      createButton({ label: tx("Bar_Delete"), variant: "danger", onClick: () => void onDelete() }),
      discardButton,
      saveButton,
    ],
  });
  host.replaceChildren(
    el("div", {
      className: "m01-logic",
      children: [
        el("main", { className: "m01-logic__main", children: [bar, errors, list.root, editor] }),
        calc,
      ],
    }),
  );
  side.logicHost.replaceChildren(filterHost);
  show(null);
  showLoadingOverlay();
  const openKeyOn = async (key: string): Promise<void> => {
    const found = allLogics.find((x) => x.키 === key);
    if (found) await open(logicId(found.구분, found.키), found.구분, found.키);
    else showToast(tx("Load_Failed"), "error");
  };

  try {
    await reload();
    if (openKey) await openKeyOn(openKey);
  } catch (error) {
    showToast(error instanceof Error ? error.message : tx("Load_Failed"), "error");
  } finally {
    hideLoadingOverlay();
  }
  return { openKey: openKeyOn };
}