{% extends "page.html" %}

{% block main %}
<div class="container">
  <h1>User Activity Monitor</h1>
  <p class="text-muted">Real-time resource usage and engagement metrics</p>

  <hr>

  <!-- Loading indicator -->
  <div id="loading-indicator" class="text-center py-4">
    <span class="spinner-border spinner-border-sm" role="status" aria-hidden="true"></span>
    <span class="ms-2">Loading activity data...</span>
  </div>

  <!-- No data message -->
  <div id="no-data-message" style="display: none;">
    <div class="alert alert-info">
      <i class="fa fa-info-circle" aria-hidden="true"></i>
      No active user servers found. Start a server to see activity data.
    </div>
  </div>

  <!-- Activity table -->
  <div id="activity-table-container" style="display: none;">
    <div class="d-flex justify-content-between align-items-center mb-3">
      <div>
        <span class="badge bg-dark" id="active-count"></span>
      </div>
      <div>
        <button class="btn btn-outline-danger btn-sm me-2" id="reset-btn">
          <i class="fa fa-trash" aria-hidden="true"></i> Reset
        </button>
        <button class="btn btn-outline-secondary btn-sm" id="refresh-btn">
          <i class="fa fa-refresh" aria-hidden="true"></i> Refresh
        </button>
      </div>
    </div>

    <table class="table table-sm table-striped table-hover activity-table">
      <thead class="table-dark">
        <tr>
          <th class="col-user sortable" data-sort="username" title="JupyterHub username">User <span class="sort-icon"></span></th>
          <th class="col-auth text-center sortable" data-sort="is_authorized" title="Authorization status in NativeAuthenticator">Auth <span class="sort-icon"></span></th>
          <th class="col-status text-center sortable" data-sort="status" title="Server status: green=active, yellow=idle, red=offline">Status <span class="sort-icon"></span></th>
          <th class="col-cpu text-center sortable" data-sort="cpu_percent" title="Current CPU usage of user container">CPU <span class="sort-icon"></span></th>
          <th class="col-memory text-center sortable" data-sort="memory_mb" title="Current memory usage of user container">Memory <span class="sort-icon"></span></th>
          <th class="col-volumes text-center sortable" data-sort="volume_size_mb" title="Total size of user volumes (hover for breakdown)">Volumes <span class="sort-icon"></span></th>
          <th class="col-timeleft text-center sortable" data-sort="time_remaining_seconds" title="Time until idle culler stops the server">Time Left <span class="sort-icon"></span></th>
          <th class="col-lastactive sortable" data-sort="last_activity" title="Time since last JupyterLab activity">Last Active <span class="sort-icon"></span></th>
          <th class="col-activity sortable" data-sort="activity_score" title="Activity score based on exponential decay (hover bar for %)">Activity <span class="sort-icon"></span></th>
        </tr>
      </thead>
      <tbody id="activity-table-body">
        <!-- Populated by JavaScript -->
      </tbody>
    </table>
  </div>

</div>

<script>
require(["jquery"], function($) {
  "use strict";

  // Target hours for 100% activity score (from config)
  var targetHours = {{ activitymon_target_hours | default(8) }};
  var normalizationFactor = targetHours / 24;  // e.g., 8/24 = 0.333

  // Minimum samples required for 24h of data
  var sampleInterval = {{ activitymon_sample_interval | default(600) }};  // seconds
  var minSamplesFor24h = Math.ceil(86400 / sampleInterval);  // e.g., 86400/600 = 144 samples

  var autoRefreshInterval = null;
  var currentUsersData = [];  // Store data for re-sorting
  var sortColumn = null;      // Current sort column
  var sortDirection = null;   // 'asc', 'desc', or null

  // Initial fetch
  fetchActivityData();

  // Sorting click handlers
  $('th.sortable').on('click', function() {
    var column = $(this).data('sort');

    // Cycle through: none -> desc -> asc -> none
    if (sortColumn !== column) {
      sortColumn = column;
      sortDirection = 'desc';
    } else if (sortDirection === 'desc') {
      sortDirection = 'asc';
    } else if (sortDirection === 'asc') {
      sortColumn = null;
      sortDirection = null;
    }

    updateSortIcons();
    renderTableRows();
  });

  function updateSortIcons() {
    $('th.sortable .sort-icon').html('');
    if (sortColumn && sortDirection) {
      var icon = sortDirection === 'asc' ? '<i class="fa fa-sort-up"></i>' : '<i class="fa fa-sort-down"></i>';
      $('th.sortable[data-sort="' + sortColumn + '"] .sort-icon').html(icon);
    }
  }

  // Auto-refresh resources every 10 seconds (status, CPU, memory, timers)
  autoRefreshInterval = setInterval(fetchActivityData, 10000);

  // Manual refresh button
  $('#refresh-btn').on('click', function() {
    var btn = $(this);
    btn.prop('disabled', true).html('<span class="spinner-border spinner-border-sm" role="status" aria-hidden="true"></span>');
    fetchActivityData(function() {
      btn.prop('disabled', false).html('<i class="fa fa-refresh" aria-hidden="true"></i> Refresh');
    });
  });

  // Reset button
  $('#reset-btn').on('click', function() {
    if (!confirm('Reset all activity data? This will clear all historical samples.')) {
      return;
    }
    var btn = $(this);
    btn.prop('disabled', true);
    $.ajax({
      url: '{{ base_url }}api/activity/reset',
      method: 'POST',
      headers: {
        'X-XSRFToken': getCookie('_xsrf')
      },
      success: function(data) {
        btn.prop('disabled', false);
        fetchActivityData();
      },
      error: function(xhr) {
        btn.prop('disabled', false);
        alert('Failed to reset activity data');
      }
    });
  });

  function fetchActivityData(callback) {
    $.ajax({
      url: '{{ base_url }}api/activity',
      method: 'GET',
      headers: {
        'X-XSRFToken': getCookie('_xsrf')
      },
      success: function(data) {
        renderActivityTable(data);
        if (callback) callback();
      },
      error: function(xhr) {
        $('#loading-indicator').hide();
        $('#activity-table-container').hide();
        $('#no-data-message').show().find('.alert')
          .removeClass('alert-info')
          .addClass('alert-danger')
          .html('<i class="fa fa-exclamation-circle"></i> Failed to load activity data');
        if (callback) callback();
      }
    });
  }

  function renderActivityTable(data) {
    var users = data.users || [];

    $('#loading-indicator').hide();

    if (users.length === 0) {
      $('#activity-table-container').hide();
      $('#no-data-message').show();
      return;
    }

    $('#no-data-message').hide();
    $('#activity-table-container').show();

    // Update header info - count users by status
    var activeCount = users.filter(function(u) { return u.server_active && u.recently_active; }).length;
    var idleCount = users.filter(function(u) { return u.server_active && !u.recently_active; }).length;
    var offlineCount = users.filter(function(u) { return !u.server_active; }).length;
    var badgeText = users.length + ' user' + (users.length !== 1 ? 's' : '') +
                    ' (' + activeCount + ' active, ' + idleCount + ' idle, ' + offlineCount + ' offline)';
    $('#active-count').text(badgeText);

    // Store data for sorting
    currentUsersData = users;
    renderTableRows();
  }

  function renderTableRows() {
    if (currentUsersData.length === 0) return;

    // Copy array for sorting
    var users = currentUsersData.slice();

    // Helper to get sortable value for a column
    function getSortValue(user, column, direction) {
      // Status sorting: active > inactive > offline (higher = better)
      // Must be checked first since 'status' is not a real field
      if (column === 'status') {
        if (user.server_active && user.recently_active) return 2;  // green - active
        if (user.server_active) return 1;  // amber - inactive
        return 0;  // red - offline
      }

      // Authorization sorting: authorized (1) > not authorized (0)
      if (column === 'is_authorized') {
        return user.is_authorized ? 1 : 0;
      }

      var val = user[column];

      // Handle null/undefined - push to end regardless of direction
      if (val === null || val === undefined) {
        return direction === 'asc' ? Infinity : -Infinity;
      }

      // String comparison for username
      if (column === 'username') {
        return (val || '').toLowerCase();
      }

      // Date comparison for last_activity
      if (column === 'last_activity') {
        return val ? new Date(val).getTime() : (direction === 'asc' ? Infinity : -Infinity);
      }

      return val;
    }

    // Apply sorting with secondary sort by username
    users.sort(function(a, b) {
      var column = sortColumn || 'status';
      var direction = sortDirection || 'desc';

      var aVal = getSortValue(a, column, direction);
      var bVal = getSortValue(b, column, direction);

      var result = 0;
      if (aVal < bVal) result = direction === 'asc' ? -1 : 1;
      else if (aVal > bVal) result = direction === 'asc' ? 1 : -1;

      // Secondary sort by username (always ascending) when primary values are equal
      if (result === 0 && column !== 'username') {
        var aName = (a.username || '').toLowerCase();
        var bName = (b.username || '').toLowerCase();
        if (aName < bName) result = -1;
        else if (aName > bName) result = 1;
      }

      return result;
    });

    // Build table rows
    var tbody = $('#activity-table-body');
    tbody.empty();

    users.forEach(function(user) {
      var row = '<tr>' +
        '<td><strong>' + escapeHtml(user.username) + '</strong></td>' +
        '<td class="text-center">' + formatAuth(user.is_authorized) + '</td>' +
        '<td class="text-center">' + formatStatus(user.server_active, user.recently_active) + '</td>' +
        '<td class="text-center">' + formatCpu(user.cpu_percent) + '</td>' +
        '<td class="text-center">' + formatMemory(user.memory_mb, user.memory_percent) + '</td>' +
        '<td class="text-center">' + formatVolumeSize(user.volume_size_mb, user.volume_breakdown) + '</td>' +
        '<td class="text-center">' + formatTimeRemaining(user.time_remaining_seconds) + '</td>' +
        '<td>' + formatLastActive(user.last_activity) + '</td>' +
        '<td>' + renderActivityBar(user.activity_score, user.sample_count) + '</td>' +
        '</tr>';
      tbody.append(row);
    });
  }

  function formatStatus(serverActive, recentlyActive) {
    // Green: server running AND recently active
    // Yellow: server running BUT inactive
    // Red: server offline
    if (serverActive && recentlyActive) {
      return '<span title="Online (active)"><i class="fa fa-circle" style="color: #28a745;" aria-hidden="true"></i></span>';
    } else if (serverActive) {
      return '<span title="Online (inactive)"><i class="fa fa-circle text-warning" aria-hidden="true"></i></span>';
    } else {
      return '<span title="Offline"><i class="fa fa-circle text-danger" aria-hidden="true"></i></span>';
    }
  }

  function formatAuth(isAuthorized) {
    if (isAuthorized) {
      return '<span title="Authorized"><i class="fa fa-check" style="color: #28a745;" aria-hidden="true"></i></span>';
    } else {
      return '<span title="Not authorized"><i class="fa fa-times text-danger" aria-hidden="true"></i></span>';
    }
  }

  function formatCpu(cpuPercent) {
    if (cpuPercent === null || cpuPercent === undefined) {
      return '<span class="text-muted">--</span>';
    }
    return cpuPercent.toFixed(1) + '%';
  }

  function formatMemory(memoryMb, memoryPercent) {
    if (memoryMb === null || memoryMb === undefined) {
      return '<span class="text-muted">--</span>';
    }
    if (memoryMb >= 1024) {
      return (memoryMb / 1024).toFixed(1) + ' GB';
    }
    return memoryMb.toFixed(0) + ' MB';
  }

  function formatVolumeSize(sizeMb, breakdown) {
    if (sizeMb === null || sizeMb === undefined || sizeMb === 0) {
      return '<span class="text-muted">--</span>';
    }
    // Format total size
    var displaySize;
    if (sizeMb >= 1024) {
      displaySize = (sizeMb / 1024).toFixed(1) + ' GB';
    } else {
      displaySize = Math.round(sizeMb) + ' MB';
    }
    // Build tooltip with breakdown
    if (breakdown && Object.keys(breakdown).length > 0) {
      var tooltipLines = [];
      // Sort volumes by name for consistent display
      var sortedKeys = Object.keys(breakdown).sort();
      sortedKeys.forEach(function(suffix) {
        var volSize = breakdown[suffix];
        var volDisplay;
        if (volSize >= 1024) {
          volDisplay = (volSize / 1024).toFixed(1) + ' GB';
        } else {
          volDisplay = Math.round(volSize) + ' MB';
        }
        tooltipLines.push(suffix + ': ' + volDisplay);
      });
      var tooltip = tooltipLines.join('&#10;');
      return '<span title="' + tooltip + '" style="cursor: help; border-bottom: 1px dotted currentColor;">' + displaySize + '</span>';
    }
    return displaySize;
  }

  function formatTimeRemaining(seconds) {
    if (seconds === null || seconds === undefined) {
      return '<span class="text-muted">--</span>';
    }
    if (seconds <= 0) {
      return '<span class="text-danger">Expiring...</span>';
    }

    var hours = Math.floor(seconds / 3600);
    var minutes = Math.floor((seconds % 3600) / 60);

    if (hours >= 24) {
      var days = Math.floor(hours / 24);
      hours = hours % 24;
      return days + 'd ' + hours + 'h';
    } else if (hours > 0) {
      return hours + 'h ' + minutes + 'm';
    } else {
      return minutes + 'm';
    }
  }

  function formatLastActive(isoString) {
    if (!isoString) {
      return '<span class="text-muted">--</span>';
    }
    var date = new Date(isoString);
    var now = new Date();
    var diffMs = now - date;
    var diffSec = Math.floor(diffMs / 1000);
    var diffMin = Math.floor(diffSec / 60);
    var diffHour = Math.floor(diffMin / 60);
    var diffDay = Math.floor(diffHour / 24);
    var diffMonth = Math.floor(diffDay / 30);

    if (diffMin < 1) {
      return '<span class="text-success">now</span>';
    } else if (diffMin < 60) {
      return diffMin + (diffMin === 1 ? ' minute ago' : ' minutes ago');
    } else if (diffHour < 24) {
      return diffHour + (diffHour === 1 ? ' hour ago' : ' hours ago');
    } else if (diffDay < 30) {
      return diffDay + (diffDay === 1 ? ' day ago' : ' days ago');
    } else {
      return diffMonth + (diffMonth === 1 ? ' month ago' : ' months ago');
    }
  }

  function renderActivityBar(rawScore, sampleCount) {
    if (rawScore === null || rawScore === undefined) {
      return '<span class="text-muted small">--</span>';
    }

    // Check if we have enough data (at least 24h of samples)
    var hasEnoughData = sampleCount >= minSamplesFor24h;

    // Normalize score based on target hours (e.g., 8h/day = 100%)
    // Raw score is % of sampled time active (8h/24h ≈ 33% for 8h worker)
    // Normalized score = raw / (target/24) -> 33% / 0.333 = 100%
    var normalizedScore = Math.round(rawScore / normalizationFactor);

    // Cap bar display at 100% (5 segments) but show real % in tooltip
    var displayScore = Math.min(normalizedScore, 100);

    // Calculate number of lit segments (0-5) based on capped score
    var litSegments = Math.ceil(displayScore / 20);  // 0-20=1, 21-40=2, 41-60=3, 61-80=4, 81-100=5
    if (displayScore === 0) litSegments = 0;

    // Color based on lit segments: 1=red, 2-3=yellow, 4-5=green
    var segmentColor;
    if (litSegments >= 4) {
      segmentColor = '#28a745';  // Green - high activity (4-5)
    } else if (litSegments >= 2) {
      segmentColor = '#ffc107';  // Yellow - medium activity (2-3)
    } else {
      segmentColor = '#dc3545';  // Red - low activity (1)
    }

    // Tooltip: show % only if we have enough data, otherwise "not enough data"
    var tooltipText;
    if (hasEnoughData) {
      tooltipText = 'Activity: ' + normalizedScore + '%';
    } else {
      var hoursCollected = Math.round((sampleCount * sampleInterval) / 3600);
      tooltipText = 'Not enough data (' + hoursCollected + 'h of 24h collected)';
    }

    // Thin continuous bar with dividers
    var html = '<div style="display: flex; width: 80px; height: 8px; border: 1px solid #6c757d; border-radius: 3px; overflow: hidden;" title="' + tooltipText + '">';
    for (var i = 0; i < 5; i++) {
      var isLit = i < litSegments;
      var borderRight = i < 4 ? 'border-right: 1px solid #6c757d;' : '';
      if (isLit) {
        html += '<div style="flex: 1; background-color: ' + segmentColor + '; ' + borderRight + '"></div>';
      } else {
        html += '<div style="flex: 1; background-color: transparent; ' + borderRight + '"></div>';
      }
    }
    html += '</div>';
    return html;
  }

  function getCookie(name) {
    var match = document.cookie.match(new RegExp('(^| )' + name + '=([^;]+)'));
    if (match) return match[2];
  }

  function escapeHtml(text) {
    if (text === null || text === undefined) return '';
    var map = {
      '&': '&amp;',
      '<': '&lt;',
      '>': '&gt;',
      '"': '&quot;',
      "'": '&#039;'
    };
    return String(text).replace(/[&<>"']/g, function(m) { return map[m]; });
  }
});
</script>
{% endblock %}