/* =============================================================================
 * 「시스템」 탭(92장 · 시스템 관리자만) — 리소스(7 · 30 · 90일) · 활성 추이 · 전체 회사 ·
 * 전체 사용자 · 시스템 로그(쪽 넘김) · 고객 문의. 모두 이미 있는 API.
 * ========================================================================== */

import { createButton, createTag, showToast, type TagVariant } from "@ui/ui_template_elements";
import { section, text } from "@ui/ui_template_general_blocks";
import {
  fetchAuditLogPage,
  fetchSystemResources,
  type AuditLog,
  type ResourceData,
  type SupportRequest,
} from "./B01_Dashboard_Api_Fetch";
import { allUserTable, auditLogTable } from "./B01_Dashboard_UI_Admin";
import { companyTable } from "./B01_Dashboard_UI_Company";
import { formatDate, formatTime, L, stackedCell } from "./B01_Dashboard_UI_Common";
import type { DashboardState } from "./B01_Dashboard_UI_Page";
import { buildPager, createPagedTable } from "./B01_Dashboard_UI_Paging";
import { buildActivityChart, buildResourcePanel } from "./B01_Dashboard_UI_Resources";

/** 리소스 기간(일) — 백엔드 최대 90 */
export const RESOURCE_DAYS = [7, 30, 90] as const;
/** 시스템 로그 한 쪽 줄 수 */
export const AUDIT_PAGE_SIZE = 20;

const INQUIRY_TAG: Record<SupportRequest["status"], TagVariant> = {
  NEW: "warning",
  REVIEWED: "accent",
  RESOLVED: "success",
  DELETED: "neutral",
};

/** 기간 고르기 + 리소스 현황 + 활성 추이 — 기간을 바꾸면 이 두 컨테이너만 새로 받음 */
function buildResourceSections(initial: ResourceData | null): HTMLElement[] {
  const bar = document.createElement("div");
  bar.className = "b01-dashboard__period";
  const panelHost = document.createElement("div");
  const trendHost = document.createElement("div");
  let days: number = RESOURCE_DAYS[0];
  let latest = 0;

  const draw = (data: ResourceData | null): void => {
    panelHost.replaceChildren(buildResourcePanel(data, days));
    trendHost.replaceChildren(buildActivityChart(data, days));
  };
  const drawBar = (): void => {
    bar.replaceChildren(
      ...RESOURCE_DAYS.map((value) => {
        const button = createButton({
          label: L("B01_Sy_Days").replace("{days}", String(value)),
          variant: value === days ? "filled" : "ghost",
          onClick: () => void pick(value),
        });
        button.setAttribute("aria-pressed", String(value === days));
        button.dataset.b01Days = String(value);
        return button;
      }),
    );
  };
  const pick = async (value: number): Promise<void> => {
    if (value === days) return;
    days = value;
    drawBar();
    const mine = ++latest;
    try {
      const data = await fetchSystemResources(value);
      if (mine === latest) draw(data);
    } catch (error) {
      if (mine === latest) showToast(error instanceof Error ? error.message : "", "error");
    }
  };
  drawBar();
  draw(initial);
  const resource = section(L("B01_Dashboard_Resources"), panelHost, true);
  resource.querySelector(".ui-card__body")?.prepend(bar);
  return [resource, section(L("B01_Sy_ActiveTrend"), trendHost, true)];
}

/** 시스템 로그 — 서버가 쪽으로 나눠 줌(전체 건수 포함) */
function buildAuditSection(first: { total: number; items: AuditLog[] }): HTMLElement {
  const host = document.createElement("div");
  const draw = (page: number, data: { total: number; items: AuditLog[] }): void => {
    const pages = Math.max(1, Math.ceil(data.total / AUDIT_PAGE_SIZE));
    host.replaceChildren(
      auditLogTable(data.items),
      buildPager(page, pages, data.total, (next) => {
        fetchAuditLogPage(next, AUDIT_PAGE_SIZE)
          .then((result) => draw(next, result))
          .catch((error) => showToast(error instanceof Error ? error.message : "", "error"));
      }),
    );
  };
  draw(1, first);
  return section(L("B01_Dashboard_AuditLogs"), host, true);
}

function inquiryTable(requests: SupportRequest[]): HTMLElement {
  return createPagedTable(
    [
      L("B01_Sy_Received"),
      L("B01_Sy_Sender"),
      L("B01_Dashboard_Table_Company"),
      L("B01_Sy_Subject"),
      L("B01_Pj_Message"),
      L("B01_Dashboard_Table_Status"),
    ],
    (request: SupportRequest) => {
      const message = document.createElement("span");
      message.className = "b01-dashboard__ellipsis";
      message.textContent = request.message;
      message.title = request.message;
      return [
        stackedCell(formatDate(request.created_at), formatTime(request.created_at)),
        text([request.user_name, request.user_email].filter(Boolean).join(" · ")),
        text(request.company_name),
        text(request.subject),
        message,
        createTag(L(`B01_Sy_Inquiry_${request.status}`), INQUIRY_TAG[request.status]),
      ];
    },
    requests,
  ).root;
}

export function buildSystemTab(state: DashboardState): HTMLElement[] {
  return [
    ...buildResourceSections(state.resources),
    section(L("B01_Sy_AllCompanies"), companyTable(state.allCompanies, state.user), true),
    section(L("B01_Sy_AllUsers"), allUserTable(state.systemUsers), true),
    buildAuditSection({ total: state.auditTotal, items: state.auditLogs }),
    section(L("B01_Sy_Inquiries"), inquiryTable(state.supportRequests), true),
  ];
}