/* =============================================================================
 * E06_StabRock_UI_Page.ts
 * E06 암반 평사투영 해석(요구 345 · 351 · 요구서 4-2 2차 · PLAN 536-1) — B05~B09 틀(group_workflow).
 *   좌 = 절리군 표 · 해석 설정 · [초기화] [저장] [해석]
 *   가운데 = 위험 띠 · 스테레오넷(등각 · 등면적 · 보기 = 전체 · 평면 · 쐐기 · 전도)
 *   우 = 측점별 모드 수 · 최소 안전율 · 판정 · 고른 측점 안전율 표
 *   조작 = sessionStorage 캐시만(자동저장 없음) · [저장] = PUT · [초기화] = POST …/reset ·
 *   [해석] = 저장 안 한 고침이 있으면 먼저 저장 → POST …/analyze(서버 단독) → 결과 GET.
 * ========================================================================== */

import "./E06_StabRock_UI_Style.css";
import { API_BASE_URL, CURRENT_PROJECT_ID_KEY, ROUTES } from "@config/config_frontend";
import { attachCollapsible } from "@ui/ui_template_collapsible";
import {
  createButton,
  el,
  hideLoadingOverlay,
  showConfirmDialog,
  showLoadingOverlay,
  showToast,
} from "@ui/ui_template_elements";
import { t, type LocaleKey } from "@ui/ui_template_locale";
import { createSidePanels } from "@ui/ui_template_side_panels";
import { mountGroupStep } from "../A00_Common/group_workflow";
import {
  buildJointCards,
  type JointsDoc,
  type JointsView,
  type Projection,
  type RockDefaults,
} from "./E06_StabRock_UI_Joints";
import {
  buildBand,
  buildDetail,
  buildList,
  entryId,
  type RockResult,
  type StationEntry,
} from "./E06_StabRock_UI_Result";
import { drawStereonet, netLegend, type NetData, type NetMode } from "./E06_StabRock_UI_Stereonet";

interface RockResponse {
  joints: JointsDoc;
  saved?: boolean;
  defaults?: RockDefaults;
  stations?: { chainage_m: number; label: string; ground_type: string }[];
  editable?: boolean;
}

interface ResultResponse {
  status: string;
  stale: boolean;
  result: RockResult | null;
}

interface StationResponse {
  entry: StationEntry;
  stereonet: Record<Projection, NetData> & { phi: number };
}

const cacheKey = (projectId: string): string => `e06_rock_cache:${projectId}`;

async function api<T>(path: string, init?: RequestInit): Promise<T> {
  const response = await fetch(`${API_BASE_URL}${path}`, {
    credentials: "include",
    headers: { "Content-Type": "application/json" },
    ...init,
  });
  const body = (await response.json().catch(() => ({}))) as T & { detail?: unknown };
  if (!response.ok) {
    const detail = body.detail;
    if (typeof detail === "string") throw new Error(detail);
    const errors = (detail as { errors?: unknown[] } | undefined)?.errors;
    throw new Error(errors ? `${t("E06_Invalid")} ${errors.length}` : `HTTP ${response.status}`);
  }
  return body;
}

function toggle<T extends string>(options: [LocaleKey, T][], value: T, onPick: (v: T) => void) {
  const group = el("div", { className: "e06-toggle" });
  const buttons = options.map(([key, v]) => {
    const button = createButton({ label: t(key), variant: "ghost", size: "sm" });
    button.dataset.value = v;
    button.classList.toggle("is-on", v === value);
    button.addEventListener("click", () => {
      buttons.forEach((b) => b.classList.toggle("is-on", b === button));
      onPick(v);
    });
    return button;
  });
  group.append(...buttons);
  return group;
}

export function renderE06StabRock(root: HTMLElement): void {
  const projectId = localStorage.getItem(CURRENT_PROJECT_ID_KEY);
  const panel = el("div", { className: "ui-sidebar-panel e06-panel" });
  const main = el("div", { className: "e06-page" });
  mountGroupStep(root, ROUTES.E06_STAB_ROCK, { mainContent: main, leftPanel: panel });
  if (!projectId)
    return void main.append(el("p", { className: "e06-empty", text: t("E06_NoProject") }));

  // ---- 좌 ----
  const cards = el("div", { className: "e06-cards" });
  const status = el("p", { className: "e06-status" });
  const saveButton = createButton({
    label: t("Common_Btn_Save"),
    variant: "ghost",
    onClick: () => void save(),
  });
  const resetButton = createButton({
    label: t("Common_Btn_Reset"),
    variant: "danger-ghost",
    onClick: () => void reset(),
  });
  const analyzeButton = createButton({
    label: t("E06_Analyze"),
    variant: "filled",
    onClick: () => void analyze(),
  });
  saveButton.disabled = resetButton.disabled = analyzeButton.disabled = true;
  const actions = el("div", { className: "ui-sidebar-actions" });
  actions.append(resetButton, saveButton, analyzeButton);
  panel.append(el("p", { className: "e06-hint", text: t("E06_Note") }), cards, status, actions);
  attachCollapsible(cards);

  // ---- 가운데 · 우 ----
  const staleBar = el("div", { className: "e06-stale", text: t("E06_Stale") });
  staleBar.hidden = true;
  const bandSlot = el("div");
  const title = el("strong", { className: "e06-title" });
  const netSlot = el("div", { className: "e06-net-slot" });
  const legendSlot = el("div");
  let projection: Projection = "equal_angle";
  let netMode: NetMode = "all";
  const toolbar = el("div", { className: "e06-toolbar" });
  const projectionToggle = el("div");
  toolbar.append(
    title,
    projectionToggle,
    toggle<NetMode>(
      [
        ["E06_View_All", "all"],
        ["E06_Mode_planar", "planar"],
        ["E06_Mode_wedge", "wedge"],
        ["E06_Mode_toppling", "toppling"],
      ],
      netMode,
      (v) => {
        netMode = v;
        paintNet();
      },
    ),
  );
  const stage = el("div", { className: "e06-stage" });
  stage.append(netSlot, legendSlot);
  const center = el("div", { className: "e06-center" });
  center.append(staleBar, bandSlot, toolbar, stage);
  const listSlot = el("div", { className: "e06-list-slot" });
  const detailSlot = el("div");
  const sideBody = el("div", { className: "e06-side" });
  sideBody.append(listSlot, detailSlot);
  const side = createSidePanels({
    prefKey: "e06-stab-rock-result",
    panels: [{ id: "result", title: t("E06_Result_Title"), body: sideBody }],
    defaultOpen: "result",
    defaultWidth: 380,
    follow: false,
  });
  const row = el("div", { className: "ui-side-panels-row e06-row" });
  row.append(center, side.root);
  main.append(row);

  // ---- 상태 ----
  let view: JointsView | null = null;
  let dirty = false;
  let result: RockResult | null = null;
  let active: string | null = null;
  let shown: StationResponse | null = null;

  const invalidCount = (): number => cards.querySelectorAll(".is-invalid").length;
  const paintStatus = (): void => {
    const lines: string[] = [];
    if (view && !view.editable) lines.push(t("E06_ReadOnly"));
    if (dirty) lines.push(t("E06_Unsaved"));
    const bad = invalidCount();
    if (bad) lines.push(`${t("E06_Invalid")} ${bad}`);
    status.textContent = lines.join("\n");
    status.classList.toggle("is-error", bad > 0);
  };

  const renderCards = (): void => {
    if (!view) return;
    // 다시 그려도 접힘은 그대로
    const folded = [...cards.children].map((c) => c.classList.contains("is-collapsed"));
    const built = buildJointCards(view);
    built.forEach(
      (c, i) => folded[i] !== undefined && c.classList.toggle("is-collapsed", folded[i]),
    );
    cards.replaceChildren(...built);
    paintStatus();
  };

  const remember = (): void => {
    if (!view) return;
    dirty = true;
    sessionStorage.setItem(cacheKey(projectId), JSON.stringify(view.doc));
  };

  function paintProjection(): void {
    projectionToggle.replaceChildren(
      toggle<Projection>(
        [
          ["E06_Proj_Angle", "equal_angle"],
          ["E06_Proj_Area", "equal_area"],
        ],
        projection,
        (v) => {
          projection = v; // 보기 고름 — 정본 아님(해석 지문에도 안 들어감)
          paintNet();
        },
      ),
    );
  }

  function paintNet(): void {
    legendSlot.replaceChildren(netLegend(netMode));
    if (!shown) {
      title.textContent = "";
      netSlot.replaceChildren(el("p", { className: "e06-empty", text: t("E06_PickStation") }));
      return;
    }
    const e = shown.entry;
    title.textContent = `${e.label ?? e.key} · ${t(e.slope.side === "left" ? "E06_Left" : "E06_Right")} · φ ${shown.stereonet.phi}°`;
    netSlot.replaceChildren(
      drawStereonet(shown.stereonet[projection], netMode, {
        planar: e.kinematic.planar,
        toppling: e.kinematic.toppling,
        wedge: e.kinematic.wedge.map((w) => w.ids.join("|")),
      }),
    );
  }

  function paintResult(): void {
    const stations = result?.stations ?? [];
    bandSlot.replaceChildren(buildBand(stations, active, (id) => void select(id)));
    listSlot.replaceChildren(
      stations.length
        ? buildList(stations, active, (id) => void select(id))
        : el("p", { className: "e06-hint", text: t(result ? "E06_NoRock" : "E06_NoResult") }),
    );
    detailSlot.replaceChildren(shown ? buildDetail(shown.entry) : el("span"));
    paintNet();
  }

  async function select(id: string): Promise<void> {
    active = id;
    const [key, sideName] = id.split("|");
    try {
      shown = await api<StationResponse>(
        `/projects/${projectId}/stab/rock/result?station=${encodeURIComponent(key)}&side=${sideName}`,
      );
    } catch (error) {
      shown = null;
      showToast(error instanceof Error ? error.message : t("Common_Status_Error"), "error");
    }
    paintResult();
  }

  async function loadResult(): Promise<void> {
    const body = await api<ResultResponse>(`/projects/${projectId}/stab/rock/result`);
    result = body.result;
    staleBar.hidden = !body.stale;
    const stations = result?.stations ?? [];
    const keep = stations.find((e) => entryId(e) === active);
    const first = keep ?? stations.find((e) => e.verdict === "NG") ?? stations[0];
    if (first) await select(entryId(first));
    else {
      active = null;
      shown = null;
      paintResult();
    }
  }

  const adopt = (body: RockResponse, keepCache: boolean): void => {
    if (!view) return;
    const cached = keepCache ? sessionStorage.getItem(cacheKey(projectId)) : null;
    if (!cached) sessionStorage.removeItem(cacheKey(projectId));
    view.doc = cached ? (JSON.parse(cached) as JointsDoc) : body.joints;
    dirty = Boolean(cached);
    saveButton.disabled = resetButton.disabled = analyzeButton.disabled = !view.editable;
    renderCards();
  };

  async function putJoints(): Promise<boolean> {
    if (!view?.editable) return false;
    if (invalidCount()) {
      showToast(`${t("E06_Invalid")} ${invalidCount()}`, "error");
      return false;
    }
    const body = await api<RockResponse>(`/projects/${projectId}/stab/rock`, {
      method: "PUT",
      body: JSON.stringify({ joints: view.doc }),
    });
    adopt(body, false);
    return true;
  }

  async function save(): Promise<void> {
    showLoadingOverlay();
    try {
      if (await putJoints()) {
        showToast(t("E06_Saved"), "success");
        await loadResult();
      }
    } catch (error) {
      showToast(error instanceof Error ? error.message : t("Common_Status_Error"), "error");
    } finally {
      hideLoadingOverlay();
    }
  }

  async function reset(): Promise<void> {
    if (!view?.editable) return;
    const ok = await showConfirmDialog(
      t("E06_ResetConfirm"),
      t("Common_Btn_Reset"),
      t("Common_Btn_Cancel"),
    );
    if (!ok) return;
    showLoadingOverlay();
    try {
      const body = await api<RockResponse>(`/projects/${projectId}/stab/rock/reset`, {
        method: "POST",
      });
      adopt(body, false);
      showToast(t("E06_ResetDone"), "success");
      await loadResult();
    } catch (error) {
      showToast(error instanceof Error ? error.message : t("Common_Status_Error"), "error");
    } finally {
      hideLoadingOverlay();
    }
  }

  async function analyze(): Promise<void> {
    if (!view?.editable) return;
    analyzeButton.disabled = true;
    status.textContent = t("E06_Running");
    try {
      if (dirty && !(await putJoints())) return;
      const body = await api<{ status: string; summary?: RockResult["summary"] }>(
        `/projects/${projectId}/stab/rock/analyze`,
        { method: "POST" },
      );
      await loadResult();
      showToast(t(body.status === "fresh" ? "E06_Fresh" : "E06_Done"), "success");
    } catch (error) {
      showToast(error instanceof Error ? error.message : t("Common_Status_Error"), "error");
    } finally {
      analyzeButton.disabled = !view.editable;
      paintStatus();
    }
  }

  void (async () => {
    try {
      const body = await api<RockResponse>(`/projects/${projectId}/stab/rock`);
      const stations = body.stations ?? [];
      projection = body.joints.settings.projection;
      paintProjection();
      view = {
        doc: body.joints,
        defaults: body.defaults as RockDefaults,
        editable: body.editable ?? false,
        endM: stations.length ? stations[stations.length - 1].chainage_m : 0,
        change: () => {
          remember();
          paintStatus();
        },
        rebuild: () => {
          remember();
          renderCards();
        },
      };
      adopt(body, true);
      await loadResult();
    } catch (error) {
      main.replaceChildren(
        el("p", {
          className: "e06-empty",
          text: error instanceof Error ? error.message : t("Common_Status_Error"),
        }),
      );
    }
  })();
}