{% extends "page.html" %}

{% block main %}
<div class="container">
  <h1>Broadcast Notifications</h1>
  <p class="text-muted">Send notifications to all active JupyterLab servers</p>

  <hr>

  <div class="row">
    <div class="col-md-8">
      <form id="notification-form">
        <div class="mb-3">
          <label for="message" class="form-label">Message <span class="text-danger">*</span></label>
          <textarea
            class="form-control"
            id="message"
            name="message"
            rows="4"
            maxlength="140"
            placeholder="Type your notification message here..."
            required></textarea>
          <div class="form-text">Maximum 140 characters. <span id="char-count">0/140</span></div>
        </div>

        <div class="mb-3">
          <label for="variant" class="form-label">Notification Type <span class="text-danger">*</span></label>
          <select class="form-select" id="variant" name="variant" required>
            <option value="default">Default</option>
            <option value="info" selected>Info (Blue)</option>
            <option value="success">Success (Green)</option>
            <option value="warning">Warning (Yellow)</option>
            <option value="error">Error (Red)</option>
            <option value="in-progress">In Progress</option>
          </select>
        </div>

        <div class="mb-3 form-check">
          <input type="checkbox" class="form-check-input" id="autoClose" name="autoClose">
          <label class="form-check-label" for="autoClose">
            Auto-close notification (automatically dismiss after a few seconds)
          </label>
        </div>

        <div class="mb-3">
          <label class="form-label">Recipients</label>
          <div class="form-check">
            <input type="checkbox" class="form-check-input" id="send-to-all" checked>
            <label class="form-check-label" for="send-to-all">
              <strong>Send to all active servers</strong>
            </label>
          </div>

          <div id="server-selection" class="mt-2" style="display: none;">
            <div class="d-flex gap-2 mb-2">
              <button type="button" class="btn btn-outline-secondary btn-sm" id="select-all">Select All</button>
              <button type="button" class="btn btn-outline-secondary btn-sm" id="deselect-all">Deselect All</button>
            </div>
            <div id="server-list" class="border rounded p-2" style="max-height: 200px; overflow-y: auto;">
              <span class="text-muted">Loading active servers...</span>
            </div>
          </div>
        </div>

        <button type="submit" class="btn btn-primary btn-lg" id="send-btn">
          <i class="fa fa-paper-plane" aria-hidden="true"></i>
          <span id="send-btn-text">Send to All Active Servers</span>
        </button>
      </form>
    </div>
  </div>

  <hr>

  <!-- Results section (hidden by default) -->
  <div id="results-section" style="display: none;" class="mt-4">
    <h3>Broadcast Results</h3>
    <div id="results-alert"></div>

    <button
      class="btn btn-secondary btn-sm mb-3"
      type="button"
      data-bs-toggle="collapse"
      data-bs-target="#details-table"
      aria-expanded="false"
      aria-controls="details-table"
      id="toggle-details-btn">
      Show Details
    </button>

    <div class="collapse" id="details-table">
      <table class="table table-striped">
        <thead>
          <tr>
            <th>Username</th>
            <th>Status</th>
            <th>Details</th>
          </tr>
        </thead>
        <tbody id="details-tbody">
        </tbody>
      </table>
    </div>
  </div>

</div>

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

  var activeServers = [];

  // Fetch active servers on page load
  $.ajax({
    url: '{{ base_url }}api/notifications/active-servers',
    method: 'GET',
    headers: {
      'X-XSRFToken': getCookie('_xsrf')
    },
    success: function(data) {
      activeServers = data.servers || [];
      renderServerList();
    },
    error: function() {
      $('#server-list').html('<span class="text-danger">Failed to load servers</span>');
    }
  });

  function renderServerList() {
    var $list = $('#server-list');
    if (activeServers.length === 0) {
      $list.html('<span class="text-muted">No active servers</span>');
      return;
    }

    var html = '';
    activeServers.forEach(function(server) {
      html += '<div class="form-check">' +
        '<input type="checkbox" class="form-check-input server-checkbox" ' +
        'id="server-' + escapeHtml(server.username) + '" ' +
        'value="' + escapeHtml(server.username) + '" checked>' +
        '<label class="form-check-label" for="server-' + escapeHtml(server.username) + '">' +
        escapeHtml(server.username) + '</label></div>';
    });
    $list.html(html);

    // Bind change event for button text update
    $('.server-checkbox').on('change', updateButtonText);
  }

  // Toggle server selection visibility
  $('#send-to-all').on('change', function() {
    $('#server-selection').toggle(!this.checked);
    updateButtonText();
  });

  // Select All / Deselect All
  $('#select-all').on('click', function() {
    $('.server-checkbox').prop('checked', true);
    updateButtonText();
  });

  $('#deselect-all').on('click', function() {
    $('.server-checkbox').prop('checked', false);
    updateButtonText();
  });

  function updateButtonText() {
    var sendToAll = $('#send-to-all').is(':checked');
    var selectedCount = $('.server-checkbox:checked').length;
    var totalCount = activeServers.length;

    if (sendToAll) {
      $('#send-btn-text').text('Send to All Active Servers');
    } else if (selectedCount === 0) {
      $('#send-btn-text').text('Select Recipients');
    } else if (selectedCount === totalCount) {
      $('#send-btn-text').text('Send to All ' + totalCount + ' Server(s)');
    } else {
      $('#send-btn-text').text('Send to ' + selectedCount + ' Server(s)');
    }
  }

  // Character counter
  $('#message').on('input', function() {
    var length = $(this).val().length;
    $('#char-count').text(length + '/140');
  });

  // Form submission
  $('#notification-form').on('submit', function(e) {
    e.preventDefault();

    // Get form data
    var message = $('#message').val().trim();
    var variant = $('#variant').val();
    var autoClose = $('#autoClose').is(':checked');
    var sendToAll = $('#send-to-all').is(':checked');

    // Build recipients list
    var recipients = null;
    if (!sendToAll) {
      recipients = [];
      $('.server-checkbox:checked').each(function() {
        recipients.push($(this).val());
      });

      if (recipients.length === 0) {
        alert('Please select at least one recipient');
        return;
      }
    }

    // Validate
    if (!message) {
      alert('Please enter a message');
      return;
    }

    if (message.length > 140) {
      alert('Message cannot exceed 140 characters');
      return;
    }

    // Disable button and show loading
    var $sendBtn = $('#send-btn');
    var originalHtml = $sendBtn.html();
    $sendBtn.prop('disabled', true);
    $sendBtn.html('<span class="spinner-border spinner-border-sm" role="status" aria-hidden="true"></span> Sending...');

    // Hide previous results
    $('#results-section').hide();

    // Build request payload
    var payload = {
      message: message,
      variant: variant,
      autoClose: autoClose
    };
    if (recipients !== null) {
      payload.recipients = recipients;
    }

    // Send request
    $.ajax({
      url: '{{ base_url }}api/notifications/broadcast',
      method: 'POST',
      contentType: 'application/json',
      headers: {
        'X-XSRFToken': getCookie('_xsrf')
      },
      data: JSON.stringify(payload),
      success: function(data) {
        displayResults(data);
        // Clear form
        $('#message').val('');
        $('#char-count').text('0/140');
        $('#autoClose').prop('checked', false);
      },
      error: function(xhr) {
        var errorMsg = 'Failed to send notification';
        if (xhr.responseJSON && xhr.responseJSON.message) {
          errorMsg = xhr.responseJSON.message;
        }
        alert('Error: ' + errorMsg);
      },
      complete: function() {
        // Re-enable button
        $sendBtn.prop('disabled', false);
        $sendBtn.html(originalHtml);
      }
    });
  });

  function displayResults(data) {
    var total = data.total || 0;
    var successful = data.successful || 0;
    var failed = data.failed || 0;
    var details = data.details || [];

    // Show results section
    $('#results-section').show();

    // Build alert message
    var alertClass = 'alert-success';
    var alertIcon = '<i class="fa fa-check-circle"></i>';
    var alertMessage = '';

    if (total === 0) {
      alertClass = 'alert-info';
      alertIcon = '<i class="fa fa-info-circle"></i>';
      alertMessage = 'No active servers found';
    } else if (failed === 0) {
      alertMessage = alertIcon + ' Notification sent successfully to all ' + total + ' server(s)';
    } else if (successful === 0) {
      alertClass = 'alert-danger';
      alertIcon = '<i class="fa fa-times-circle"></i>';
      alertMessage = alertIcon + ' Failed to send notification to all ' + total + ' server(s)';
    } else {
      alertClass = 'alert-warning';
      alertIcon = '<i class="fa fa-exclamation-triangle"></i>';
      alertMessage = alertIcon + ' Notification sent with partial success<br>' +
        '<strong>Delivered:</strong> ' + successful + '/' + total + ' servers | ' +
        '<strong>Failed:</strong> ' + failed + '/' + total + ' servers';
    }

    $('#results-alert').html('<div class="alert ' + alertClass + '">' + alertMessage + '</div>');

    // Build details table
    var tbody = $('#details-tbody');
    tbody.empty();

    if (details.length > 0) {
      details.forEach(function(detail) {
        var statusBadge = '';
        var errorCell = '';

        if (detail.status === 'success') {
          statusBadge = '<span class="badge bg-success"><i class="fa fa-check"></i> Success</span>';
          errorCell = '-';
        } else {
          statusBadge = '<span class="badge bg-danger"><i class="fa fa-times"></i> Failed</span>';
          errorCell = detail.error || 'Unknown error';
        }

        var row = '<tr>' +
          '<td>' + escapeHtml(detail.username) + '</td>' +
          '<td>' + statusBadge + '</td>' +
          '<td>' + escapeHtml(errorCell) + '</td>' +
          '</tr>';

        tbody.append(row);
      });

      // Update button text
      $('#toggle-details-btn').text('Show Details (' + details.length + ' servers)');
    }
  }

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

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