{% load i18n %}
<h3>{% blocktrans with filter_title=title %} By {{ filter_title }} {% endblocktrans %}</h3>
<form method="GET" class="charfield-filter-form">
    {% for param,value in spec.get_query_params.items %}
        {% if param != spec.parameter_name %}
            <input type="hidden" name="{{ param }}" value="{{ value }}">
        {% endif %}
    {% endfor %}
    <input type="text" 
           class="charfield-filter-autocomplete" 
           name="{{ spec.parameter_name }}" 
           value="{{ spec.value|default:'' }}"
           placeholder="{% trans 'Search...' %}"
           autocomplete="off">
</form>

<style>
    .charfield-filter-autocomplete {
        width: 100%;
        padding: 8px;
        margin: 5px 0;
        border: 1px solid #ccc;
        border-radius: 4px;
        box-sizing: border-box;
    }
    .charfield-filter-autocomplete:focus {
        border-color: #666;
        outline: none;
    }
    .charfield-filter-form {
        margin: 0;
        padding: 0;
    }
     
</style>

<script>
    document.addEventListener('DOMContentLoaded', function() {
        var input = document.querySelector('.charfield-filter-autocomplete');
        var form = input.closest('form');
        
        function updateURL(value) {
            // Get current URL and parameters
            var url = new URL(window.location.href);
            var params = new URLSearchParams(url.search);
            
            // Update or remove the filter parameter
            if (value) {
                params.set(input.name, value);
            } else {
                params.delete(input.name);
            }
            
            // Preserve other parameters from the form
            form.querySelectorAll('input[type="hidden"]').forEach(function(hidden) {
                params.set(hidden.name, hidden.value);
            });
            
            // Update URL without reloading
            url.search = params.toString();
            window.history.pushState({}, '', url);
            
            // Fetch and update content
            fetch(url)
                .then(response => response.text())
                .then(html => {
                    // Find the results container
                    var parser = new DOMParser();
                    var doc = parser.parseFromString(html, 'text/html');
                    var newResults = doc.querySelector('#changelist-form');
                    var currentResults = document.querySelector('#changelist-form');
                    
                    if (newResults && currentResults) {
                        currentResults.innerHTML = newResults.innerHTML;
                    }
                });
        }
        
        var debounceTimer;
        input.addEventListener('input', function(e) {
            clearTimeout(debounceTimer);
            var value = this.value;
            debounceTimer = setTimeout(function() {
                updateURL(value);
            }, 300);
        });

        // Prevent form submission
        form.addEventListener('submit', function(e) {
            e.preventDefault();
        });
    });
</script>