/* =============================================================================
 * E02_StabGround_UI_Page.ts
 * E02 지반 조건(요구서 345 4-3 · 요구 347-2 · 3 · 4 · PLAN 532-3) — B05~B09 틀(group_workflow).
 *   GET /api/projects/{id}/stab/ground → 작업본(없으면 초기값) · 기본값 · 고칠 수 있는지.
 *   조작 = sessionStorage 캐시만(자동저장 없음) · [저장] = PUT(서버가 다시 검사 · 측점은 서버 값) ·
 *   [초기화] = POST …/reset(초기값 덮어씀). 검사 = logic/E02_StabGround_Check(파이썬 짝).
 *   칸 위 마우스 = 틀린 까닭 · 기본값 · 근거(지식DB 07 · KDS 11 70 05).
 * ========================================================================== */

import "./E02_StabGround_UI_Style.css";
import { API_BASE_URL, CURRENT_PROJECT_ID_KEY, ROUTES } from "@config/config_frontend";
import {
  createButton,
  el,
  hideLoadingOverlay,
  showConfirmDialog,
  showLoadingOverlay,
  showToast,
} from "@ui/ui_template_elements";
import { attachHoverInfo } from "@ui/ui_template_hover_info";
import { t, type LocaleKey } from "@ui/ui_template_locale";
import { mountGroupStep } from "../A00_Common/group_workflow";
import { buildMissingBanner } from "../E01_StabRegister/E01_StabRegister_UI_Missing";
import { buildCards, type E02View } from "./E02_StabGround_UI_Tables";
import {
  checkGround,
  type CheckError,
  type Ground,
  type GroundDefaults,
} from "./logic/E02_StabGround_Check";

interface GroundResponse {
  ground: Ground;
  saved?: boolean;
  defaults?: GroundDefaults;
  editable?: boolean;
  missing_stations?: number[];
}

const cacheKey = (projectId: string): string => `e02_ground_cache:${projectId}`;

/** 검사 열쇠 → 범위 열쇠(limits) */
function limitKey(path: string): string {
  const last = path.split(".").pop() ?? "";
  if (path.startsWith("safety_factors.")) return "safety_factor";
  if (last === "from_m" || last === "to_m") return "chainage_m";
  if (/\.points\.\d+\.0$/.test(path)) return "offset_m";
  if (/\.points\.\d+\.1$/.test(path)) return "water_depth_m";
  return last;
}

function errorText(error: CheckError, defaults: GroundDefaults): string {
  const text = t(`E02_Err_${error.code}` as LocaleKey);
  const bound = defaults.limits[limitKey(error.path)];
  return error.code === "range" && bound ? `${text} (${bound[0]} ~ ${bound[1]})` : text;
}

async function request(path: string, init?: RequestInit): Promise<GroundResponse> {
  const response = await fetch(`${API_BASE_URL}${path}`, {
    credentials: "include",
    headers: { "Content-Type": "application/json" },
    ...init,
  });
  const body = (await response.json().catch(() => ({}))) as GroundResponse & { detail?: unknown };
  if (!response.ok) {
    const detail = body.detail;
    if (typeof detail === "string") throw new Error(detail);
    const errors = (detail as { errors?: CheckError[] } | undefined)?.errors;
    throw new Error(errors ? `${t("E02_Invalid")} ${errors.length}` : `HTTP ${response.status}`);
  }
  return body;
}

export function renderE02StabGround(root: HTMLElement): void {
  const projectId = localStorage.getItem(CURRENT_PROJECT_ID_KEY);
  const main = el("div", { className: "e02-page" });
  const status = el("p", { className: "e02-status" });
  const saveButton = createButton({
    label: t("Common_Btn_Save"),
    variant: "filled",
    onClick: () => void save(),
  });
  const resetButton = createButton({
    label: t("Common_Btn_Reset"),
    variant: "danger-ghost",
    onClick: () => void reset(),
  });
  saveButton.disabled = resetButton.disabled = true; // 읽어 온 뒤 켬
  const actions = el("div", { className: "ui-sidebar-actions" });
  actions.append(resetButton, saveButton);
  const panel = el("div", { className: "ui-sidebar-panel e02-panel" });
  panel.append(el("p", { className: "e02-hint", text: t("E02_Note") }), status, actions);
  mountGroupStep(root, ROUTES.E02_STAB_GROUND, { mainContent: main, leftPanel: panel });
  if (!projectId)
    return void main.append(el("p", { className: "e02-empty", text: t("E02_NoProject") }));

  let view: E02View | null = null;
  let refreshStations = (): void => {};
  let dirty = false;
  let missing: number[] = [];

  const paintStatus = (errors: CheckError[]): void => {
    const lines: string[] = [];
    if (view && !view.editable) lines.push(t("E02_ReadOnly"));
    if (dirty) lines.push(t("E02_Unsaved"));
    if (errors.length) lines.push(`${t("E02_Invalid")} ${errors.length}`);
    status.textContent = lines.join("\n");
    status.classList.toggle("is-error", errors.length > 0);
  };

  /** 틀린 칸 표시 — 칸마다 is-invalid + data-error(마우스 글) */
  const mark = (): CheckError[] => {
    if (!view) return [];
    const errors = checkGround(view.ground, view.defaults.limits);
    for (const node of main.querySelectorAll<HTMLElement>(".is-invalid")) {
      node.classList.remove("is-invalid");
      delete node.dataset.error;
    }
    for (const error of errors) {
      const node = main.querySelector<HTMLElement>(`[data-path="${error.path}"]`);
      if (!node) continue;
      node.classList.add("is-invalid");
      node.dataset.error = errorText(error, view.defaults);
    }
    paintStatus(errors);
    return errors;
  };

  const render = (): void => {
    if (!view) return;
    const cards = buildCards(view);
    refreshStations = cards.refreshStations;
    main.replaceChildren(buildMissingBanner(missing), cards.root);
    mark();
  };

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

  const adopt = (body: GroundResponse, keepCache: boolean): void => {
    if (!view || !body.defaults) return;
    let ground = body.ground;
    const cached = keepCache ? sessionStorage.getItem(cacheKey(projectId)) : null;
    if (cached) ground = JSON.parse(cached) as Ground;
    else sessionStorage.removeItem(cacheKey(projectId));
    // 옛 캐시(지하수 갈래 칸 전) — 빠진 칸은 서버 값(서버가 기본값으로 채워 보냄)
    ground.groundwater = { ...body.ground.groundwater, ...ground.groundwater };
    dirty = Boolean(cached);
    view.ground = ground;
    view.defaults = body.defaults;
    view.editable = body.editable ?? false;
    saveButton.disabled = resetButton.disabled = !view.editable;
    render();
  };

  async function save(): Promise<void> {
    if (!view?.editable) return;
    const errors = mark();
    if (errors.length) {
      showToast(
        `${t("E02_Invalid")} ${errors.length} — ${errorText(errors[0], view.defaults)}`,
        "error",
      );
      return;
    }
    showLoadingOverlay();
    try {
      const body = await request(`/projects/${projectId}/stab/ground`, {
        method: "PUT",
        body: JSON.stringify({ ground: view.ground }),
      });
      adopt({ ...body, defaults: view.defaults, editable: view.editable }, false);
      showToast(t("E02_Saved"), "success");
    } catch (error) {
      showToast(error instanceof Error ? error.message : t("Common_Status_Error"), "error");
    } finally {
      hideLoadingOverlay();
    }
  }

  async function reset(): Promise<void> {
    if (!view?.editable) return;
    if (
      !(await showConfirmDialog(
        t("E02_ResetConfirm"),
        t("Common_Btn_Reset"),
        t("Common_Btn_Cancel"),
      ))
    )
      return;
    showLoadingOverlay();
    try {
      const body = await request(`/projects/${projectId}/stab/ground/reset`, { method: "POST" });
      adopt({ ...body, defaults: view.defaults, editable: view.editable }, false);
      showToast(t("E02_ResetDone"), "success");
    } catch (error) {
      showToast(error instanceof Error ? error.message : t("Common_Status_Error"), "error");
    } finally {
      hideLoadingOverlay();
    }
  }

  attachHoverInfo(
    main,
    (target) => {
      if (!view) return null;
      const src = target.dataset.src;
      const source = src ? view.defaults.sources[src] : undefined;
      const userLayer = src?.startsWith("materials.") && !source;
      return [
        target.dataset.error,
        target.dataset.def !== undefined ? `${t("E02_DefaultIs")} ${target.dataset.def}` : "",
        source ?? (userLayer ? t("E02_UserLayer") : ""),
      ]
        .filter(Boolean)
        .join("\n");
    },
    "[data-path]",
  );

  void (async () => {
    try {
      const body = await request(`/projects/${projectId}/stab/ground`);
      missing = body.missing_stations ?? [];
      view = {
        ground: body.ground,
        defaults: body.defaults as GroundDefaults,
        editable: false,
        change: () => {
          remember();
          refreshStations();
          mark();
        },
        rebuild: () => {
          remember();
          render();
        },
      };
      adopt(body, true);
    } catch (error) {
      main.replaceChildren(
        el("p", {
          className: "e02-empty",
          text: error instanceof Error ? error.message : t("Common_Status_Error"),
        }),
      );
    }
  })();
}