/**
 * Activity monitoring and display functionality
 */

class ActivityMonitor {
  constructor() {
    this.activityLog = document.getElementById("activityLog");
    this.notificationsToggle = document.getElementById("notificationsToggle");
    this.notificationsEnabled = true;
    this.lastPaperTimestamp = new Date().toISOString();

    // Pagination state
    this.currentPage = 1;
    this.perPage = 20;
    this.statusFilter = "";
    this.totalPages = 1;
    this.totalEntries = 0;

    // Pagination elements
    this.paginationContainer = document.getElementById("activityPagination");
    this.paginationInfo = document.getElementById("activityPaginationInfo");
    this.prevPageBtn = document.getElementById("activityPrevPage");
    this.nextPageBtn = document.getElementById("activityNextPage");
    this.currentPageSpan = document.getElementById("activityCurrentPage");
    this.pageSizeSelect = document.getElementById("activityPageSize");
    this.statusFilterSelect = document.getElementById("activityStatusFilter");

    this.initEventListeners();
    this.setupWebSocket();
  }

  /**
   * Initialize event listeners
   */
  initEventListeners() {
    if (this.notificationsToggle) {
      this.notificationsToggle.addEventListener("click", () => {
        this.notificationsEnabled = this.notificationsToggle.checked;
      });
    }

    // Time range buttons
    document.querySelectorAll(".time-range-btn").forEach((btn) => {
      btn.addEventListener("click", () => {
        document
          .querySelectorAll(".time-range-btn")
          .forEach((b) => b.classList.remove("active"));
        btn.classList.add("active");
        const currentTimeRange = parseInt(btn.dataset.hours);

        // Trigger chart refresh if callback is provided
        if (this.onChartRefresh) {
          this.onChartRefresh(currentTimeRange);
        }
      });
    });

    // Pagination event listeners
    if (this.prevPageBtn) {
      this.prevPageBtn.addEventListener("click", (e) => {
        e.preventDefault();
        if (this.currentPage > 1) {
          this.currentPage--;
          this.loadRecentActivity();
        }
      });
    }

    if (this.nextPageBtn) {
      this.nextPageBtn.addEventListener("click", (e) => {
        e.preventDefault();
        if (this.currentPage < this.totalPages) {
          this.currentPage++;
          this.loadRecentActivity();
        }
      });
    }

    // Page size change
    if (this.pageSizeSelect) {
      this.pageSizeSelect.addEventListener("change", () => {
        this.perPage = parseInt(this.pageSizeSelect.value);
        this.currentPage = 1; // Reset to first page
        this.loadRecentActivity();
      });
    }

    // Status filter change
    if (this.statusFilterSelect) {
      this.statusFilterSelect.addEventListener("change", () => {
        this.statusFilter = this.statusFilterSelect.value;
        this.currentPage = 1; // Reset to first page
        this.loadRecentActivity();
      });
    }
  }

  /**
   * Load and render recent activity
   */
  async loadRecentActivity() {
    if (!this.activityLog) return;

    try {
      // Build query parameters for pagination
      const params = new URLSearchParams({
        page: this.currentPage,
        per_page: this.perPage,
      });

      // Add multiple category parameters
      params.append("category", "scraper_activity");
      params.append("category", "scraper_command");

      if (this.statusFilter) {
        params.append("status", this.statusFilter);
      }

      const data = await apiRequest(`/scraper/logs?${params.toString()}`);

      if (data.success) {
        this.renderActivityLog(data.logs);
        this.updatePagination(data.pagination);
        console.log("Activity log refreshed with latest data");
      } else {
        throw new Error(data.message || "Failed to load logs");
      }
    } catch (error) {
      console.error("Failed to load activity logs:", error);
      // If the API endpoint doesn't exist, just show a message
      this.activityLog.innerHTML =
        '<tr><td colspan="4" class="text-center">Activity log API not available</td></tr>';
      this.hidePagination();
    }
  }

  /**
   * Render activity log data
   * @param {Array} logs - Array of log entries
   */
  renderActivityLog(logs) {
    if (!this.activityLog) return;

    this.activityLog.innerHTML = "";

    if (!logs || logs.length === 0) {
      this.activityLog.innerHTML =
        '<tr><td colspan="4" class="text-center">No recent activity</td></tr>';
      return;
    }

    logs.forEach((log) => {
      const row = document.createElement("tr");

      // Format timestamp
      const timeStr = formatTimestamp(log.timestamp);

      // Create status badge
      const statusBadge = createStatusBadge(log.status);

      row.innerHTML = `
                <td>${timeStr}</td>
                <td>${log.action}</td>
                <td>${statusBadge}</td>
                <td>${log.description || ""}</td>
            `;

      this.activityLog.appendChild(row);
    });
  }

  /**
   * Update pagination controls based on API response
   * @param {Object} pagination - Pagination data from API
   */
  updatePagination(pagination) {
    if (!pagination || !this.paginationContainer) return;

    this.currentPage = pagination.page;
    this.totalPages = pagination.pages;
    this.totalEntries = pagination.total;

    // Show pagination container
    this.paginationContainer.classList.remove("d-none");

    // Update pagination info
    const startEntry = (pagination.page - 1) * pagination.per_page + 1;
    const endEntry = Math.min(
      pagination.page * pagination.per_page,
      pagination.total
    );

    if (this.paginationInfo) {
      this.paginationInfo.textContent = `Showing ${startEntry} - ${endEntry} of ${pagination.total} entries`;
    }

    // Update current page display
    if (this.currentPageSpan) {
      this.currentPageSpan.textContent = `${pagination.page} of ${pagination.pages}`;
    }

    // Update previous button
    if (this.prevPageBtn) {
      if (pagination.has_prev) {
        this.prevPageBtn.classList.remove("disabled");
        this.prevPageBtn.querySelector("a").removeAttribute("tabindex");
        this.prevPageBtn
          .querySelector("a")
          .setAttribute("aria-disabled", "false");
      } else {
        this.prevPageBtn.classList.add("disabled");
        this.prevPageBtn.querySelector("a").setAttribute("tabindex", "-1");
        this.prevPageBtn
          .querySelector("a")
          .setAttribute("aria-disabled", "true");
      }
    }

    // Update next button
    if (this.nextPageBtn) {
      if (pagination.has_next) {
        this.nextPageBtn.classList.remove("disabled");
        this.nextPageBtn.querySelector("a").removeAttribute("tabindex");
        this.nextPageBtn
          .querySelector("a")
          .setAttribute("aria-disabled", "false");
      } else {
        this.nextPageBtn.classList.add("disabled");
        this.nextPageBtn.querySelector("a").setAttribute("tabindex", "-1");
        this.nextPageBtn
          .querySelector("a")
          .setAttribute("aria-disabled", "true");
      }
    }
  }

  /**
   * Hide pagination controls when not needed
   */
  hidePagination() {
    if (this.paginationContainer) {
      this.paginationContainer.classList.add("d-none");
    }
  }

  /**
   * Setup WebSocket for real-time notifications
   */
  setupWebSocket() {
    // If WebSocket is available, implement it here
    // For now we'll poll the server periodically for new papers
    setInterval(() => this.checkForNewPapers(), 10000); // Check every 10 seconds
  }

  /**
   * Check for new papers and show notifications
   */
  async checkForNewPapers() {
    if (!this.notificationsEnabled) return;

    try {
      // Use the API endpoint for checking new papers, with limit for efficiency
      const data = await apiRequest(
        `/api/activity_logs?category=scraper_activity&category=scraper_command&action=scrape_paper&after=${this.lastPaperTimestamp}&limit=5`
      );

      if (data && data.length > 0) {
        // Update the timestamp
        this.lastPaperTimestamp = new Date().toISOString();

        // Show notifications for new papers
        data.forEach((log) => {
          const extraData = log.extra_data ? JSON.parse(log.extra_data) : {};
          if (log.status === "success") {
            showFlashMessage(
              `New paper scraped: ${extraData.title || "Unknown title"}`,
              "success"
            );
          } else if (log.status === "error") {
            showFlashMessage(
              `Failed to scrape paper: ${log.description}`,
              "error"
            );
          }
        });

        // Refresh the activity chart and log
        if (this.onChartRefresh) {
          this.onChartRefresh();
        }
        // Only reload if we're on page 1 to avoid disrupting user navigation
        if (this.currentPage === 1) {
          this.loadRecentActivity();
        }
      }
    } catch (error) {
      // If the API endpoint doesn't exist, do nothing
      console.debug("Activity polling failed (this may be expected):", error);
    }
  }

  /**
   * Set callback for chart refresh
   */
  setChartRefreshCallback(callback) {
    this.onChartRefresh = callback;
  }

  /**
   * Refresh activity log manually (useful for external triggers)
   */
  refresh() {
    this.loadRecentActivity();
  }

  /**
   * Reset pagination to first page
   */
  resetToFirstPage() {
    this.currentPage = 1;
    this.loadRecentActivity();
  }
}

// Export for use in other modules
if (typeof window !== "undefined") {
  window.ActivityMonitor = ActivityMonitor;
}