/* =============================================================================
 * B06_Section_UI_Cross_Detail.ts
 * 횡단 카드 측구 줄 맨 오른쪽 [상세] → 모달(138-4).
 *
 * 맨 위 = 측점 구조물 글(`design.structure_note` · 세션 초안 → [저장]이 patch 로 내보냄) ·
 * 가운데 = 카드 그림 복제(어두운 바탕 · CAD 꼴) · 아래 = B07 횡단 수량표(값 · 칸 배치 모두
 * 서버 `cross-quantity-table` 한 길 · 캐시 설계로 · 열 때 부름).
 * 막은 투명(누름 통과) · 자리는 그 카드를 안 가리는 넓은 쪽(좌/우 → 위/아래).
 * 모달이 열린 채 카드를 다시 그리면 그림 · 표를 새로 맞춤.
 * ========================================================================== */

import "./B06_Section_UI_Style_Cross_Detail.css";
import { openModal } from "@ui/ui_template_modal";
import { readState, writeState } from "../A00_Common/b_page_state";
import { fetchCrossQuantityTable } from "./B06_Section_Api_Fetch";
import type {
  CrossQuantitySheet,
  CrossSection,
  SectionDetailResponse,
} from "./B06_Section_Api_Fetch";
import { inferStationInterval, stationLabel } from "./B06_Section_UI_Section_Common";

/** 페이지가 한 번 걸어 줌(`_UI_Page_Design_Sync`) — 카드 줄은 프로젝트 · 노선을 모름. */
export interface CrossDetailHost {
  projectId: string;
  routeId: () => number | null;
  detail: () => SectionDetailResponse | null;
}

let host: CrossDetailHost | null = null;
export function setCrossDetailHost(next: CrossDetailHost): void {
  host = next;
}

/* ── 구조물 글 세션 초안(측점키 0.01 m → 글) ─────────────────────────────── */

const noteKey = (chainageM: number): string => chainageM.toFixed(2);

/** [저장]이 patch 로 싣는 글 — 측점(m) → 글(빈 글 = 지움). */
export function readStructureNotes(projectId: string, routeId: number): Map<number, string> {
  const raw = readState<Record<string, string>>("structure-notes", projectId, routeId) ?? {};
  return new Map(Object.entries(raw).map(([key, text]) => [Number(key), String(text)]));
}

function noteOf(section: CrossSection): string {
  const routeId = host?.routeId();
  if (host && routeId !== null && routeId !== undefined) {
    const draft = readState<Record<string, string>>("structure-notes", host.projectId, routeId);
    const text = draft?.[noteKey(section.chainage_m)];
    if (text !== undefined) return text;
  }
  return section.design?.structure_note ?? "";
}

function writeNote(section: CrossSection, text: string): void {
  // 캐시 설계에도 얹음 — B05 [저장](`crossPatchesFromCache`)이 같은 값을 실음
  if (section.design) section.design.structure_note = text;
  const routeId = host?.routeId();
  if (!host || routeId === null || routeId === undefined) return;
  const all = readState<Record<string, string>>("structure-notes", host.projectId, routeId) ?? {};
  all[noteKey(section.chainage_m)] = text;
  writeState("structure-notes", all, host.projectId, routeId);
}

/* ── 자리 ───────────────────────────────────────────────────────────── */

const GAP_PX = 12;
const MIN_WIDTH_PX = 360;
const MAX_WIDTH_PX = 720;

/** 카드를 안 가리는 넓은 쪽에 붙임 — 좌우가 좁으면 위아래. */
function place(dialog: HTMLElement, card: HTMLElement | null): void {
  const vw = window.innerWidth;
  const vh = window.innerHeight;
  const rect = card?.getBoundingClientRect();
  const style = dialog.style;
  style.position = "fixed";
  style.margin = "0";
  if (!rect) {
    style.width = `${Math.min(MAX_WIDTH_PX, vw - GAP_PX * 2)}px`;
    style.left = `${(vw - Math.min(MAX_WIDTH_PX, vw - GAP_PX * 2)) / 2}px`;
    style.top = `${GAP_PX}px`;
    style.maxHeight = `${vh - GAP_PX * 2}px`;
    return;
  }
  const left = rect.left;
  const right = vw - rect.right;
  if (Math.max(left, right) >= MIN_WIDTH_PX + GAP_PX * 2) {
    const width = Math.min(MAX_WIDTH_PX, Math.max(left, right) - GAP_PX * 2);
    const top = Math.min(Math.max(rect.top, GAP_PX), vh - GAP_PX - 240);
    style.width = `${width}px`;
    style.left = `${right >= left ? rect.right + GAP_PX : rect.left - GAP_PX - width}px`;
    style.top = `${Math.max(top, GAP_PX)}px`;
    style.maxHeight = `${vh - Math.max(top, GAP_PX) - GAP_PX}px`;
    return;
  }
  const width = Math.min(MAX_WIDTH_PX, vw - GAP_PX * 2);
  style.width = `${width}px`;
  style.left = `${Math.min(Math.max(rect.left, GAP_PX), vw - GAP_PX - width)}px`;
  const below = vh - rect.bottom;
  if (below >= rect.top) {
    style.top = `${rect.bottom + GAP_PX}px`;
    style.maxHeight = `${Math.max(below - GAP_PX * 2, 160)}px`;
  } else {
    style.top = `${GAP_PX}px`;
    style.maxHeight = `${Math.max(rect.top - GAP_PX * 2, 160)}px`;
  }
}

/* ── 표(B07 칸 배치 그대로) ─────────────────────────────────────────────── */

function cell(tag: "th" | "td", text: string, span?: { col?: number; row?: number }): HTMLElement {
  const element = document.createElement(tag);
  element.textContent = text;
  if (span?.col) element.setAttribute("colspan", String(span.col));
  if (span?.row) element.setAttribute("rowspan", String(span.row));
  return element;
}

/** B07 `_cross_table_entities` 와 같은 꼴 — 제목 · 머리 넷 쌍 · 본문 6행 × (좌 · 중 · 우). */
export function buildQuantityTable(sheet: CrossQuantitySheet, title: string): HTMLTableElement {
  const { layout, text } = sheet;
  const value = (key: string | null): string => (key ? (text[key] ?? "-") : "");
  const table = document.createElement("table");
  table.className = "b06-detail__qtable";
  const titleRow = table.insertRow();
  titleRow.append(cell("th", title, { col: 8 }));
  const headRow = table.insertRow();
  for (const [label, key] of layout.header)
    headRow.append(cell("th", label), cell("td", value(key)));
  layout.left.forEach(([groupL, subL, keyL], index) => {
    const row = table.insertRow();
    if (groupL !== null && subL !== null) row.append(cell("th", groupL, { row: 2 }));
    else if (groupL !== null) row.append(cell("th", groupL, { col: 2 }));
    if (subL !== null) row.append(cell("th", subL));
    row.append(cell("td", value(keyL)));
    const [groupM, subM, keyM] = layout.middle[index];
    if (groupM !== null) row.append(cell("th", groupM, { row: 2 }));
    row.append(cell("th", subM), cell("td", value(keyM)));
    const [labelR, keyR] = layout.right[index];
    row.append(cell("th", labelR ?? ""), cell("td", value(keyR)));
  });
  return table;
}

/* ── 모달 ───────────────────────────────────────────────────────────── */

interface OpenDetail {
  stationId: string;
  section: CrossSection;
  paint: () => void;
  loadTable: () => void;
  close: () => void;
}

let current: OpenDetail | null = null;
let tableTimer = 0;

const cardOf = (section: CrossSection): HTMLElement | null =>
  document.getElementById(`cross-${section.station_id}`);

function titleOf(section: CrossSection): string {
  const stations = host?.detail()?.longitudinal.stations ?? [];
  return stationLabel(section.chainage_m, inferStationInterval(stations));
}

/** [상세] — 이미 열린 것은 닫고 이 측점으로 엶. */
export function openCrossDetail(section: CrossSection): void {
  current?.close();
  const title = titleOf(section);
  let tableSeq = 0;
  openModal({
    title: `${title} 상세`,
    closeLabel: "닫기",
    dialogClass: "b06-detail",
    backdropClass: "b06-detail__backdrop",
    mount(body, close) {
      const dialog = body.parentElement as HTMLElement;
      const note = document.createElement("textarea");
      note.className = "ui-input b06-detail__note";
      note.rows = 3;
      note.placeholder = "구조물 메모 — 이 측점에 남길 글";
      note.value = noteOf(section);
      note.addEventListener("input", () => writeNote(state.section, note.value));
      const cad = document.createElement("div");
      cad.className = "b06-detail__cad";
      const tableBox = document.createElement("div");
      tableBox.className = "b06-detail__table";
      body.append(note, cad, tableBox);

      const state: OpenDetail = {
        stationId: section.station_id,
        section,
        paint() {
          const card = cardOf(state.section);
          const svg = card?.querySelector("svg.b06-section__chart");
          cad.replaceChildren(svg ? svg.cloneNode(true) : document.createTextNode("그림 없음"));
          place(dialog, card);
        },
        loadTable() {
          const projectId = host?.projectId;
          const routeId = host?.routeId();
          if (!projectId || routeId === null || routeId === undefined) {
            tableBox.textContent = "노선 정보 없음";
            return;
          }
          const seq = ++tableSeq;
          tableBox.classList.add("is-loading");
          fetchCrossQuantityTable(
            projectId,
            routeId,
            state.section.chainage_m,
            state.section.design,
          )
            .then((sheet) => {
              if (seq !== tableSeq || current !== state) return;
              tableBox.replaceChildren(buildQuantityTable(sheet, title));
            })
            .catch((error: unknown) => {
              if (seq !== tableSeq || current !== state) return;
              tableBox.textContent = `수량표를 못 받음 — ${error instanceof Error ? error.message : error}`;
            })
            .finally(() => seq === tableSeq && tableBox.classList.remove("is-loading"));
        },
        close() {
          forget();
          close();
        },
      };
      current = state;
      tableBox.textContent = "수량표 불러오는 중…";
      state.paint();
      state.loadTable();
    },
    // 닫기 단추 · Esc 도 같은 정리를 거침
    beforeClose: () => {
      forget();
      return true;
    },
  });
}

/** 열린 모달 기억을 지움(닫힐 때). */
function forget(): void {
  window.clearTimeout(tableTimer);
  current = null;
}

/**
 * 카드를 다시 그릴 때마다 부름(`buildDesignControls`) — 그 측점 모달이 열려 있으면 새 카드로
 * 그림을 다시 뜨고 표는 조작이 멈춘 뒤 한 번 다시 받음(최신 응답만).
 */
export function refreshCrossDetail(section: CrossSection): void {
  const open = current;
  if (!open || open.stationId !== section.station_id) return;
  open.section = section;
  requestAnimationFrame(() => current === open && open.paint());
  window.clearTimeout(tableTimer);
  tableTimer = window.setTimeout(() => current === open && open.loadTable(), 400);
}