/**
 * Страница «Журнал»: GET /api/v1/journal/recent с пагинацией (30 записей на страницу).
 *
 * Автор: Сергей Антропов
 * Сайт: https://devops.org.ru
 */
(function () {
  "use strict";

  const body = document.body;
  if ((body.getAttribute("data-dashboard-mode") || "") !== "journal") return;

  const API = (body.dataset.apiBase || "/api/v1").replace(/\/$/, "");
  /** Размер страницы (синхронно с default limit в API). */
  var PAGE_SIZE = 30;

  /** Текущая страница с 1 (состояние для пагинации). */
  var currentPage = 1;

  /**
   * @param {string} path
   */
  async function apiGet(path) {
    const url = path.startsWith("http") ? path : API + path;
    const r = await fetch(url, { headers: { Accept: "application/json" } });
    const text = await r.text();
    var data;
    try {
      data = text ? JSON.parse(text) : null;
    } catch (e) {
      data = { raw: text };
    }
    if (!r.ok) {
      const msg =
        typeof data.detail === "string"
          ? data.detail
          : Array.isArray(data.detail)
            ? data.detail.map(function (x) { return x.msg || JSON.stringify(x); }).join("; ")
            : text || r.statusText;
      const err = new Error(msg);
      err.status = r.status;
      throw err;
    }
    return data;
  }

  const tbody = document.getElementById("journal-tbody");
  const statusEl = document.getElementById("journal-status");
  const emptyEl = document.getElementById("journal-empty");
  const tableWrap = document.getElementById("journal-table-wrap");
  const refreshBtn = document.getElementById("journal-refresh-btn");
  const pagNav = document.getElementById("journal-pagination");

  /** Скрыть полноэкранный спиннер первой загрузки (повторные вызовы безопасны). */
  function hideJournalPageLoadingOverlay() {
    const el = document.getElementById("journal-page-loading-overlay");
    if (!el) return;
    el.classList.add("hidden");
    el.setAttribute("aria-busy", "false");
    el.setAttribute("aria-hidden", "true");
    document.body.classList.remove("journal-page-loading");
  }

  function esc(s) {
    const d = document.createElement("div");
    d.textContent = s == null ? "" : String(s);
    return d.innerHTML;
  }

  function formatUtc(iso) {
    if (!iso) return "—";
    try {
      const d = new Date(iso);
      if (Number.isNaN(d.getTime())) return iso;
      return d.toISOString().replace("T", " ").replace(/\.\d{3}Z$/, " Z");
    } catch (e) {
      return iso;
    }
  }

  function statusClass(st) {
    const s = (st || "").toLowerCase();
    if (s === "success") return "journal-status-pill journal-status-pill--ok";
    if (s === "failed") return "journal-status-pill journal-status-pill--err";
    if (s === "cancelled") return "journal-status-pill journal-status-pill--warn";
    return "journal-status-pill";
  }

  /**
   * Список номеров страниц и многоточий для компактной навигации.
   * @param {number} current
   * @param {number} total
   * @returns {(number|string)[]}
   */
  function visiblePageItems(current, total) {
    const delta = 2;
    const range = [];
    let i;
    for (i = 1; i <= total; i++) {
      if (i === 1 || i === total || (i >= current - delta && i <= current + delta)) {
        range.push(i);
      }
    }
    const out = [];
    let l = 0;
    for (i = 0; i < range.length; i++) {
      const p = range[i];
      if (l) {
        if (p - l === 2) out.push(l + 1);
        else if (p - l > 2) out.push("…");
      }
      out.push(p);
      l = p;
    }
    return out;
  }

  /**
   * @param {number} itemCount число строк на текущей странице (для подписи «записи N–M»)
   */
  function renderPagination(total, limit, offset, page, totalPages, itemCount, onSelectPage) {
    if (!pagNav) return;
    pagNav.innerHTML = "";
    if (total <= 0 || totalPages <= 0) {
      pagNav.classList.add("hidden");
      return;
    }
    pagNav.classList.remove("hidden");

    const wrap = document.createElement("div");
    wrap.className = "journal-pagination-inner";

    function mkBtn(label, disabled, ariaLabel, onClick) {
      const b = document.createElement("button");
      b.type = "button";
      b.className = "journal-pag-btn";
      b.textContent = label;
      b.setAttribute("aria-label", ariaLabel);
      b.disabled = !!disabled;
      if (!disabled && onClick) b.addEventListener("click", onClick);
      return b;
    }

    const firstOff = 0;
    const prevOff = Math.max(0, offset - limit);
    const nextOff = Math.min(Math.max(0, total - 1), offset + limit);
    const lastOff = totalPages > 0 ? (totalPages - 1) * limit : 0;

    wrap.appendChild(
      mkBtn("« Первая", page <= 1, "Первая страница", function () {
        onSelectPage(1);
      }),
    );
    wrap.appendChild(
      mkBtn("‹ Назад", page <= 1, "Предыдущая страница", function () {
        onSelectPage(page - 1);
      }),
    );

    const pagesEl = document.createElement("div");
    pagesEl.className = "journal-pag-pages";
    pagesEl.setAttribute("role", "group");
    pagesEl.setAttribute("aria-label", "Номера страниц");

    visiblePageItems(page, totalPages).forEach(function (item) {
      if (item === "…") {
        const span = document.createElement("span");
        span.className = "journal-pag-ellipsis";
        span.setAttribute("aria-hidden", "true");
        span.textContent = "…";
        pagesEl.appendChild(span);
        return;
      }
      const pNum = item;
      const b = document.createElement("button");
      b.type = "button";
      b.className = "journal-pag-num" + (pNum === page ? " journal-pag-num--active" : "");
      b.textContent = String(pNum);
      b.setAttribute("aria-label", "Страница " + pNum);
      if (pNum === page) b.setAttribute("aria-current", "page");
      else b.removeAttribute("aria-current");
      if (pNum !== page) {
        b.addEventListener("click", function () {
          onSelectPage(pNum);
        });
      }
      pagesEl.appendChild(b);
    });

    wrap.appendChild(pagesEl);

    wrap.appendChild(
      mkBtn("Вперёд ›", page >= totalPages, "Следующая страница", function () {
        onSelectPage(page + 1);
      }),
    );
    wrap.appendChild(
      mkBtn("Последняя »", page >= totalPages, "Последняя страница", function () {
        onSelectPage(totalPages);
      }),
    );

    pagNav.appendChild(wrap);

    const from = total === 0 || itemCount === 0 ? 0 : offset + 1;
    const to = total === 0 || itemCount === 0 ? 0 : offset + itemCount;
    const hint = document.createElement("p");
    hint.className = "muted journal-pagination-summary";
    hint.textContent =
      from && to
        ? "Записи " + from + "–" + to + " из " + total + " · страница " + page + " из " + totalPages
        : "Всего записей: " + total + (totalPages ? " · страниц: " + totalPages : "");
    pagNav.appendChild(hint);
  }

  function goToPage(p) {
    if (p < 1) p = 1;
    currentPage = p;
    loadJournal(false);
  }

  /**
   * @param {boolean} resetPage сбросить на 1 (после «Обновить»)
   */
  async function loadJournal(resetPage) {
    if (!tbody || !statusEl) {
      hideJournalPageLoadingOverlay();
      return;
    }
    if (resetPage) currentPage = 1;
    const offset = (currentPage - 1) * PAGE_SIZE;
    statusEl.textContent = "Загрузка…";
    tbody.innerHTML = "";
    if (emptyEl) emptyEl.classList.add("hidden");
    if (tableWrap) tableWrap.classList.remove("hidden");
    if (pagNav) pagNav.classList.add("hidden");

    try {
      const data = await apiGet(
        "/journal/recent?limit=" +
          encodeURIComponent(String(PAGE_SIZE)) +
          "&offset=" +
          encodeURIComponent(String(offset)),
      );
      const entries = data.entries || [];
      const total = typeof data.total === "number" ? data.total : entries.length;
      const limit = typeof data.limit === "number" ? data.limit : PAGE_SIZE;
      const respOffset = typeof data.offset === "number" ? data.offset : offset;
      const totalPages = typeof data.total_pages === "number" ? data.total_pages : Math.ceil(total / limit) || 0;
      let page = typeof data.page === "number" ? data.page : currentPage;

      if (total > 0 && currentPage > totalPages) {
        currentPage = totalPages;
        await loadJournal(false);
        return;
      }

      if (total > 0 && entries.length === 0 && respOffset >= total && totalPages > 0) {
        currentPage = totalPages;
        await loadJournal(false);
        return;
      }

      page = currentPage;

      if (!entries.length) {
        if (emptyEl) emptyEl.classList.remove("hidden");
        if (tableWrap) tableWrap.classList.add("hidden");
        statusEl.textContent =
          total === 0
            ? "Нет записей в журналах."
            : "Страница пуста (всего записей: " + total + ").";
        renderPagination(total, limit, respOffset, page, totalPages, 0, goToPage);
        return;
      }

      const fromN = respOffset + 1;
      const toN = respOffset + entries.length;
      statusEl.textContent =
        "Записи " + fromN + "–" + toN + " из " + total + " · страница " + page + " из " + (totalPages || 1) + ".";

      entries.forEach(function (e) {
        const tr = document.createElement("tr");
        tr.className = "journal-data-row";
        const cluster = e.source_cluster || e.cluster_name || "—";
        const finished = formatUtc(e.finished_at_utc || e.created_at_utc);
        const msg = (e.message || "").trim();
        const lines = Array.isArray(e.log_lines) ? e.log_lines : [];
        const logText = lines.join("\n");
        const detailsId = "journal-log-" + Math.random().toString(36).slice(2, 11);

        tr.innerHTML =
          "<td class=\"journal-cell-time\">" + esc(finished) + "</td>" +
          "<td><code class=\"journal-code\">" + esc(cluster) + "</code></td>" +
          "<td><code class=\"journal-code\">" + esc(e.kind || "") + "</code></td>" +
          "<td><span class=\"" + esc(statusClass(e.status)) + "\">" + esc(e.status || "") + "</span></td>" +
          "<td class=\"journal-cell-msg\">" + esc(msg || "—") + "</td>" +
          "<td class=\"journal-cell-actions\">" +
          "<button type=\"button\" class=\"btn-secondary btn-journal-toggle\" aria-expanded=\"false\" aria-controls=\"" +
          detailsId + "\">Показать лог</button>" +
          "</td>";
        tbody.appendChild(tr);

        if (logText) {
          const trDetails = document.createElement("tr");
          trDetails.className = "journal-details-row hidden";
          trDetails.innerHTML =
            "<td colspan=\"6\" class=\"journal-details-cell\">" +
            "<pre id=\"" + detailsId + "\" class=\"mono journal-log-pre\" hidden></pre>" +
            "</td>";
          tbody.appendChild(trDetails);
          const pre = trDetails.querySelector("pre");
          if (pre) pre.textContent = logText;
          const btn = tr.querySelector(".btn-journal-toggle");
          if (btn && trDetails && pre) {
            btn.addEventListener("click", function () {
              const open = trDetails.classList.contains("hidden");
              trDetails.classList.toggle("hidden", !open);
              pre.hidden = !open;
              btn.setAttribute("aria-expanded", open ? "true" : "false");
              btn.textContent = open ? "Скрыть лог" : "Показать лог";
            });
          }
        } else {
          const btn = tr.querySelector(".btn-journal-toggle");
          if (btn) {
            btn.disabled = true;
            btn.textContent = "Нет строк";
          }
        }
      });

      renderPagination(total, limit, respOffset, page, totalPages, entries.length, goToPage);
    } catch (err) {
      statusEl.textContent = "Ошибка: " + err.message;
      if (emptyEl) emptyEl.classList.remove("hidden");
      if (tableWrap) tableWrap.classList.add("hidden");
      if (pagNav) pagNav.classList.add("hidden");
    } finally {
      hideJournalPageLoadingOverlay();
    }
  }

  if (refreshBtn) refreshBtn.addEventListener("click", function () { loadJournal(true); });

  loadJournal(false);
})();