{% extends "admin/base_site.html" %}
{% load i18n %}

{% block title %}{{ title }} | {{ site_title|default:_('Django site admin') }}{% endblock %}

{% block content %}
<div class="content-main">
    <h1>{{ title }}</h1>
    
    <div class="alert alert-info" style="margin: 10px 0; padding: 10px; border-radius: 4px; background-color: #d1ecf1; border: 1px solid #bee5eb; color: #0c5460;">
        <strong>Note:</strong> This operation only affects the database and works even if servers are unreachable. 
        Server connectivity is not required for moving links between servers.
    </div>
    
    {% if messages %}
        {% for message in messages %}
            <div class="alert alert-{{ message.tags }}" style="margin: 10px 0; padding: 10px; border-radius: 4px; 
                {% if message.tags == 'error' %}background-color: #f8d7da; border: 1px solid #f5c6cb; color: #721c24;
                {% elif message.tags == 'success' %}background-color: #d4edda; border: 1px solid #c3e6cb; color: #155724;
                {% elif message.tags == 'warning' %}background-color: #fff3cd; border: 1px solid #ffeaa7; color: #856404;
                {% elif message.tags == 'info' %}background-color: #d1ecf1; border: 1px solid #bee5eb; color: #0c5460;
                {% endif %}">
                {{ message }}
            </div>
        {% endfor %}
    {% endif %}

    <form method="post" id="move-clients-form">
        {% csrf_token %}
        
        <div class="form-row" style="margin-bottom: 20px;">
            <div style="display: flex; gap: 20px;">
                <div style="flex: 1;">
                    <label for="source_server"><strong>Source Server:</strong></label>
                    <select id="source_server" name="source_server" style="width: 100%; padding: 5px;" onchange="updateLinksList()">
                        <option value="">-- Select Source Server --</option>
                        {% for server in servers %}
                            <option value="{{ server.id }}">{{ server.name }} ({{ server.server_type }})</option>
                        {% endfor %}
                    </select>
                </div>
                
                <div style="flex: 1;">
                    <label for="target_server"><strong>Target Server:</strong></label>
                    <select id="target_server" name="target_server" style="width: 100%; padding: 5px;" onchange="updateSubmitButton()">
                        <option value="">-- Select Target Server --</option>
                        {% for server in all_servers %}
                            <option value="{{ server.id }}">{{ server.name }} ({{ server.server_type }})</option>
                        {% endfor %}
                    </select>
                </div>
            </div>
        </div>

        <div id="links-list" style="margin-bottom: 20px;">
            <h3>Select Client Links to Move:</h3>
            <div id="links-container">
                <p style="color: #666;">Please select a source server first.</p>
            </div>
        </div>

        <div class="submit-row">
            <input type="submit" value="Move Selected Links" class="default" id="submit-btn" disabled>
            <a href="{% url 'admin:vpn_server_changelist' %}" class="button cancel">Cancel</a>
        </div>
    </form>
</div>

<script>
// Client links data for each server
var linksByServer = {
    {% for server, links in links_by_server.items %}
        "{{ server.id }}": [
            {% for link in links %}
                {
                    "id": {{ link.id }},
                    "link": "{{ link.link|escapejs }}",
                    "comment": "{{ link.comment|escapejs }}",
                    "username": "{{ link.acl.user.username|escapejs }}",
                    "user_comment": "{{ link.acl.user.comment|escapejs }}",
                    "created_at": "{{ link.acl.created_at|date:'Y-m-d H:i' }}",
                    "full_url": "{{ EXTERNAL_ADDRESS }}/ss/{{ link.link }}#{{ link.acl.server.name|escapejs }}"
                },
            {% endfor %}
        ],
    {% endfor %}
};

function updateLinksList() {
    var sourceServerId = document.getElementById('source_server').value;
    var linksContainer = document.getElementById('links-container');
    var submitBtn = document.getElementById('submit-btn');
    
    if (!sourceServerId) {
        linksContainer.innerHTML = '<p style="color: #666;">Please select a source server first.</p>';
        submitBtn.disabled = true;
        return;
    }
    
    var links = linksByServer[sourceServerId] || [];
    
    if (links.length === 0) {
        linksContainer.innerHTML = '<p style="color: #666;">No client links found for this server.</p>';
        submitBtn.disabled = true;
        return;
    }
    
    // Group links by user for better organization
    var linksByUser = {};
    links.forEach(function(link) {
        if (!linksByUser[link.username]) {
            linksByUser[link.username] = {
                user_comment: link.user_comment,
                created_at: link.created_at,
                links: []
            };
        }
        linksByUser[link.username].links.push(link);
    });
    
    var html = '<div style="max-height: 500px; overflow-y: auto; border: 1px solid #ddd; padding: 10px;">';
    html += '<div style="margin-bottom: 10px;">';
    html += '<button type="button" onclick="toggleAllLinks()" style="padding: 5px 10px; margin-right: 10px;">Select All</button>';
    html += '<button type="button" onclick="toggleAllLinks(false)" style="padding: 5px 10px;">Deselect All</button>';
    html += '</div>';
    
    html += '<table style="width: 100%; border-collapse: collapse;">';
    html += '<thead><tr style="background-color: #f5f5f5;">';
    html += '<th style="padding: 8px; border: 1px solid #ddd; width: 50px;">Select</th>';
    html += '<th style="padding: 8px; border: 1px solid #ddd;">Username</th>';
    html += '<th style="padding: 8px; border: 1px solid #ddd;">Link Comment</th>';
    html += '<th style="padding: 8px; border: 1px solid #ddd;">Link ID</th>';
    html += '<th style="padding: 8px; border: 1px solid #ddd;">User Comment</th>';
    html += '<th style="padding: 8px; border: 1px solid #ddd;">Created</th>';
    html += '</tr></thead><tbody>';
    
    // Sort users alphabetically
    var sortedUsers = Object.keys(linksByUser).sort();
    
    sortedUsers.forEach(function(username) {
        var userData = linksByUser[username];
        var userLinks = userData.links;
        
        // Add user row header if user has multiple links
        if (userLinks.length > 1) {
            html += '<tr style="background-color: #f9f9f9;">';
            html += '<td style="padding: 8px; border: 1px solid #ddd; text-align: center;">';
            html += '<input type="checkbox" class="user-checkbox" data-username="' + username + '" onchange="toggleUserLinks(\'' + username + '\')">';
            html += '</td>';
            html += '<td colspan="5" style="padding: 8px; border: 1px solid #ddd;"><strong>' + username + '</strong> (' + userLinks.length + ' links)</td>';
            html += '</tr>';
        }
        
        // Add individual link rows
        userLinks.forEach(function(link) {
            html += '<tr class="link-row" data-username="' + username + '">';
            html += '<td style="padding: 8px; border: 1px solid #ddd; text-align: center;">';
            html += '<input type="checkbox" name="selected_links" value="' + link.id + '" class="link-checkbox" data-username="' + username + '" onchange="updateSubmitButton(); updateUserCheckbox(\'' + username + '\')">';
            html += '</td>';
            html += '<td style="padding: 8px; border: 1px solid #ddd;">' + (userLinks.length === 1 ? '<strong>' + username + '</strong>' : '↳') + '</td>';
            html += '<td style="padding: 8px; border: 1px solid #ddd;">' + (link.comment || '<em>No comment</em>') + '</td>';
            html += '<td style="padding: 8px; border: 1px solid #ddd; font-family: monospace; font-size: 12px;">' + link.link + '</td>';
            html += '<td style="padding: 8px; border: 1px solid #ddd;">' + (userData.user_comment || '') + '</td>';
            html += '<td style="padding: 8px; border: 1px solid #ddd;">' + userData.created_at + '</td>';
            html += '</tr>';
        });
    });
    
    html += '</tbody></table></div>';
    linksContainer.innerHTML = html;
    
    updateSubmitButton();
}

function toggleAllLinks(selectAll = true) {
    var checkboxes = document.getElementsByName('selected_links');
    var userCheckboxes = document.getElementsByClassName('user-checkbox');
    
    for (var i = 0; i < checkboxes.length; i++) {
        checkboxes[i].checked = selectAll;
    }
    
    for (var i = 0; i < userCheckboxes.length; i++) {
        userCheckboxes[i].checked = selectAll;
    }
    
    updateSubmitButton();
}

function toggleUserLinks(username) {
    var userCheckbox = document.querySelector('.user-checkbox[data-username="' + username + '"]');
    var userLinkCheckboxes = document.querySelectorAll('.link-checkbox[data-username="' + username + '"]');
    
    for (var i = 0; i < userLinkCheckboxes.length; i++) {
        userLinkCheckboxes[i].checked = userCheckbox.checked;
    }
    
    updateSubmitButton();
}

function updateUserCheckbox(username) {
    var userLinkCheckboxes = document.querySelectorAll('.link-checkbox[data-username="' + username + '"]');
    var userCheckbox = document.querySelector('.user-checkbox[data-username="' + username + '"]');
    
    if (!userCheckbox) return; // No user checkbox for single-link users
    
    var allChecked = true;
    var noneChecked = true;
    
    for (var i = 0; i < userLinkCheckboxes.length; i++) {
        if (userLinkCheckboxes[i].checked) {
            noneChecked = false;
        } else {
            allChecked = false;
        }
    }
    
    if (allChecked) {
        userCheckbox.checked = true;
        userCheckbox.indeterminate = false;
    } else if (noneChecked) {
        userCheckbox.checked = false;
        userCheckbox.indeterminate = false;
    } else {
        userCheckbox.checked = false;
        userCheckbox.indeterminate = true;
    }
}

function updateSubmitButton() {
    var checkboxes = document.getElementsByName('selected_links');
    var sourceServer = document.getElementById('source_server').value;
    var targetServer = document.getElementById('target_server').value;
    var submitBtn = document.getElementById('submit-btn');
    
    var hasSelected = false;
    for (var i = 0; i < checkboxes.length; i++) {
        if (checkboxes[i].checked) {
            hasSelected = true;
            break;
        }
    }
    
    submitBtn.disabled = !(hasSelected && sourceServer && targetServer && sourceServer !== targetServer);
}

// Form submission confirmation
document.getElementById('move-clients-form').addEventListener('submit', function(e) {
    var checkboxes = document.getElementsByName('selected_links');
    var selectedCount = 0;
    var selectedUsers = new Set();
    
    for (var i = 0; i < checkboxes.length; i++) {
        if (checkboxes[i].checked) {
            selectedCount++;
            selectedUsers.add(checkboxes[i].getAttribute('data-username'));
        }
    }
    
    var sourceServerName = document.getElementById('source_server').selectedOptions[0].text;
    var targetServerName = document.getElementById('target_server').selectedOptions[0].text;
    
    var confirmMessage = 'Are you sure you want to move ' + selectedCount + ' link(s) for ' + selectedUsers.size + ' user(s) from "' + sourceServerName + '" to "' + targetServerName + '"?\n\n';
    confirmMessage += 'This action will:\n';
    confirmMessage += '- Transfer selected links to target server\n';
    confirmMessage += '- Create ACLs for users who don\'t have access to target server\n';
    confirmMessage += '- Remove empty ACLs from source server\n';
    confirmMessage += '- Preserve all link settings and comments\n\n';
    confirmMessage += 'This cannot be undone.';
    
    if (!confirm(confirmMessage)) {
        e.preventDefault();
    }
});
</script>

<style>
.alert {
    margin: 10px 0;
    padding: 10px;
    border-radius: 4px;
}

.form-row {
    margin-bottom: 20px;
}

.submit-row {
    padding: 12px 14px;
    margin: 0 0 20px;
    background: #f8f8f8;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.submit-row input[type="submit"] {
    background: #417690;
    color: white;
    border: none;
    padding: 10px 15px;
    border-radius: 4px;
    cursor: pointer;
    margin-right: 10px;
}

.submit-row input[type="submit"]:disabled {
    background: #ccc;
    cursor: not-allowed;
}

.submit-row .cancel {
    background: #6c757d;
    color: white;
    padding: 10px 15px;
    border-radius: 4px;
    text-decoration: none;
}

.submit-row .cancel:hover {
    background: #5a6268;
    color: white;
}

.link-row:hover {
    background-color: #f8f9fa;
}

input[type="checkbox"]:indeterminate {
    opacity: 0.5;
}
</style>
{% endblock %}