mirror-seaweedfs/weed/admin/view/app/cluster_volumes.templ

package app

import (
    "fmt"
    "strings"
    "github.com/seaweedfs/seaweedfs/weed/admin/dash"
)

templ ClusterVolumes(data dash.ClusterVolumesData) {
    <div class="d-flex justify-content-between flex-wrap flex-md-nowrap align-items-center pt-3 pb-2 mb-3 border-bottom">
        <div>
            <h1 class="h2">
                <i class="fas fa-database me-2"></i>Cluster Volumes
            </h1>
            if data.FilterCollection != "" {
                <div class="d-flex align-items-center mt-2">
                    <span class="badge bg-info me-2">
                        <i class="fas fa-filter me-1"></i>Collection: {data.FilterCollection}
                    </span>
                    <a href="/cluster/volumes" class="btn btn-sm btn-outline-secondary">
                        <i class="fas fa-times me-1"></i>Clear Filter
                    </a>
                </div>
            }
        </div>
        <div class="btn-toolbar mb-2 mb-md-0">
            <div class="btn-group me-2">
                <select class="form-select form-select-sm me-2" id="pageSizeSelect" onchange="changePageSize()" style="width: auto;">
                    <option value="50" if data.PageSize == 50 { selected="selected" }>50 per page</option>
                    <option value="100" if data.PageSize == 100 { selected="selected" }>100 per page</option>
                    <option value="200" if data.PageSize == 200 { selected="selected" }>200 per page</option>
                    <option value="500" if data.PageSize == 500 { selected="selected" }>500 per page</option>
                </select>
                <button type="button" class="btn btn-sm btn-outline-primary" onclick="exportVolumes()">
                    <i class="fas fa-download me-1"></i>Export
                </button>
            </div>
        </div>
    </div>

    <div id="volumes-content">
        <!-- Summary Cards -->
        <div class="row mb-4">
            <div class="col-xl-2 col-md-4 col-sm-6 mb-4">
                <div class="card border-left-primary shadow h-100 py-2">
                    <div class="card-body">
                        <div class="row no-gutters align-items-center">
                            <div class="col mr-2">
                                <div class="text-xs font-weight-bold text-primary text-uppercase mb-1">
                                    Total Volumes
                                </div>
                                <div class="h5 mb-0 font-weight-bold text-gray-800">
                                    {fmt.Sprintf("%d", data.TotalVolumes)}
                                </div>
                            </div>
                            <div class="col-auto">
                                <i class="fas fa-database fa-2x text-gray-300"></i>
                            </div>
                        </div>
                    </div>
                </div>
            </div>

            <div class="col-xl-2 col-md-4 col-sm-6 mb-4">
                <div class="card border-left-success shadow h-100 py-2">
                    <div class="card-body">
                        <div class="row no-gutters align-items-center">
                            <div class="col mr-2">
                                <div class="text-xs font-weight-bold text-success text-uppercase mb-1">
                                    if data.CollectionCount == 1 {
                                        Collection
                                    } else {
                                        Collections
                                    }
                                </div>
                                <div class="h5 mb-0 font-weight-bold text-gray-800">
                                    if data.CollectionCount == 1 {
                                        {data.SingleCollection}
                                    } else {
                                        {fmt.Sprintf("%d", data.CollectionCount)}
                                    }
                                </div>
                            </div>
                            <div class="col-auto">
                                <i class="fas fa-layer-group fa-2x text-gray-300"></i>
                            </div>
                        </div>
                    </div>
                </div>
            </div>

            <div class="col-xl-2 col-md-4 col-sm-6 mb-4">
                <div class="card border-left-info shadow h-100 py-2">
                    <div class="card-body">
                        <div class="row no-gutters align-items-center">
                            <div class="col mr-2">
                                <div class="text-xs font-weight-bold text-info text-uppercase mb-1">
                                    if data.DataCenterCount == 1 {
                                        Data Center
                                    } else {
                                        Data Centers
                                    }
                                </div>
                                <div class="h5 mb-0 font-weight-bold text-gray-800">
                                    if data.DataCenterCount == 1 {
                                        {data.SingleDataCenter}
                                    } else {
                                        {fmt.Sprintf("%d", data.DataCenterCount)}
                                    }
                                </div>
                            </div>
                            <div class="col-auto">
                                <i class="fas fa-building fa-2x text-gray-300"></i>
                            </div>
                        </div>
                    </div>
                </div>
            </div>

            <div class="col-xl-2 col-md-4 col-sm-6 mb-4">
                <div class="card border-left-secondary shadow h-100 py-2">
                    <div class="card-body">
                        <div class="row no-gutters align-items-center">
                            <div class="col mr-2">
                                <div class="text-xs font-weight-bold text-secondary text-uppercase mb-1">
                                    if data.RackCount == 1 {
                                        Rack
                                    } else {
                                        Racks
                                    }
                                </div>
                                <div class="h5 mb-0 font-weight-bold text-gray-800">
                                    if data.RackCount == 1 {
                                        {data.SingleRack}
                                    } else {
                                        {fmt.Sprintf("%d", data.RackCount)}
                                    }
                                </div>
                            </div>
                            <div class="col-auto">
                                <i class="fas fa-server fa-2x text-gray-300"></i>
                            </div>
                        </div>
                    </div>
                </div>
            </div>

            <div class="col-xl-2 col-md-4 col-sm-6 mb-4">
                <div class="card border-left-dark shadow h-100 py-2">
                    <div class="card-body">
                        <div class="row no-gutters align-items-center">
                            <div class="col mr-2">
                                <div class="text-xs font-weight-bold text-dark text-uppercase mb-1">
                                    if data.DiskTypeCount == 1 {
                                        Disk Type
                                    } else {
                                        Disk Types
                                    }
                                </div>
                                <div class="h5 mb-0 font-weight-bold text-gray-800">
                                    if data.DiskTypeCount == 1 {
                                        {data.SingleDiskType}
                                    } else {
                                        {strings.Join(data.AllDiskTypes, ", ")}
                                    }
                                </div>
                            </div>
                            <div class="col-auto">
                                <i class="fas fa-hdd fa-2x text-gray-300"></i>
                            </div>
                        </div>
                    </div>
                </div>
            </div>

            <div class="col-xl-2 col-md-4 col-sm-6 mb-4">
                <div class="card border-left-purple shadow h-100 py-2">
                    <div class="card-body">
                        <div class="row no-gutters align-items-center">
                            <div class="col mr-2">
                                <div class="text-xs font-weight-bold text-purple text-uppercase mb-1">
                                    if data.VersionCount == 1 {
                                        Version
                                    } else {
                                        Versions
                                    }
                                </div>
                                <div class="h5 mb-0 font-weight-bold text-gray-800">
                                    if data.VersionCount == 1 {
                                        {data.SingleVersion}
                                    } else {
                                        {strings.Join(data.AllVersions, ", ")}
                                    }
                                </div>
                            </div>
                            <div class="col-auto">
                                <i class="fas fa-code-branch fa-2x text-gray-300"></i>
                            </div>
                        </div>
                    </div>
                </div>
            </div>

            <div class="col-xl-2 col-md-4 col-sm-6 mb-4">
                <div class="card border-left-warning shadow h-100 py-2">
                    <div class="card-body">
                        <div class="row no-gutters align-items-center">
                            <div class="col mr-2">
                                <div class="text-xs font-weight-bold text-warning text-uppercase mb-1">
                                    Total Size
                                </div>
                                <div class="h5 mb-0 font-weight-bold text-gray-800">
                                    {formatBytes(data.TotalSize)}
                                </div>
                            </div>
                            <div class="col-auto">
                                <i class="fas fa-chart-area fa-2x text-gray-300"></i>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </div>

        <!-- Volumes Table -->
        <div class="card shadow mb-4">
            <div class="card-header py-3">
                <h6 class="m-0 font-weight-bold text-primary">
                    <i class="fas fa-database me-2"></i>Volume Details
                </h6>
            </div>
            <div class="card-body">
                if len(data.Volumes) > 0 {
                    <div class="table-responsive">
                        <table class="table table-hover" id="volumesTable">
                            <thead>
                                <tr>
                                    <th>
                                        <a href="#" onclick="sortTable('id')" class="text-decoration-none text-dark">
                                            Volume ID
                                            @getSortIcon("id", data.SortBy, data.SortOrder)
                                        </a>
                                    </th>
                                    <th>
                                        <a href="#" onclick="sortTable('server')" class="text-decoration-none text-dark">
                                            Server
                                            @getSortIcon("server", data.SortBy, data.SortOrder)
                                        </a>
                                    </th>
                                    if data.ShowDataCenterColumn {
                                        <th>
                                            <a href="#" onclick="sortTable('datacenter')" class="text-decoration-none text-dark">
                                                Data Center
                                                @getSortIcon("datacenter", data.SortBy, data.SortOrder)
                                            </a>
                                        </th>
                                    }
                                    if data.ShowRackColumn {
                                        <th>
                                            <a href="#" onclick="sortTable('rack')" class="text-decoration-none text-dark">
                                                Rack
                                                @getSortIcon("rack", data.SortBy, data.SortOrder)
                                            </a>
                                        </th>
                                    }
                                    if data.ShowCollectionColumn {
                                        <th>
                                            <a href="#" onclick="sortTable('collection')" class="text-decoration-none text-dark">
                                                Collection
                                                @getSortIcon("collection", data.SortBy, data.SortOrder)
                                            </a>
                                        </th>
                                    }
                                    <th>
                                        <a href="#" onclick="sortTable('size')" class="text-decoration-none text-dark">
                                            Size
                                            @getSortIcon("size", data.SortBy, data.SortOrder)
                                        </a>
                                    </th>
                                    <th>Volume Utilization</th>
                                    <th>
                                        <a href="#" onclick="sortTable('filecount')" class="text-decoration-none text-dark">
                                            File Count
                                            @getSortIcon("filecount", data.SortBy, data.SortOrder)
                                        </a>
                                    </th>
                                    <th>
                                        <a href="#" onclick="sortTable('replication')" class="text-decoration-none text-dark">
                                            Replication
                                            @getSortIcon("replication", data.SortBy, data.SortOrder)
                                        </a>
                                    </th>
                                    if data.ShowDiskTypeColumn {
                                        <th>
                                            <a href="#" onclick="sortTable('disktype')" class="text-decoration-none text-dark">
                                                Disk Type
                                                @getSortIcon("disktype", data.SortBy, data.SortOrder)
                                            </a>
                                        </th>
                                    }
                                    if data.ShowVersionColumn {
                                        <th>
                                            <a href="#" onclick="sortTable('version')" class="text-decoration-none text-dark">
                                                Version
                                                @getSortIcon("version", data.SortBy, data.SortOrder)
                                            </a>
                                        </th>
                                    }
                                    <th>Actions</th>
                                </tr>
                            </thead>
                            <tbody>
                                for _, volume := range data.Volumes {
                                    <tr>
                                        <td>
                                            <code class="volume-id-link" style="cursor: pointer; text-decoration: underline; color: #0d6efd;" 
                                                  data-volume-id={fmt.Sprintf("%d", volume.Id)}
                                                  title="Click to view volume details">
                                                {fmt.Sprintf("%d", volume.Id)}
                                            </code>
                                        </td>
                                        <td>
                                            <a href={templ.SafeURL(fmt.Sprintf("http://%s/ui/index.html", volume.Server))} target="_blank" class="text-decoration-none">
                                                {volume.Server}
                                                <i class="fas fa-external-link-alt ms-1 text-muted"></i>
                                            </a>
                                        </td>
                                        if data.ShowDataCenterColumn {
                                            <td>
                                                <span class="badge bg-light text-dark">{volume.DataCenter}</span>
                                            </td>
                                        }
                                        if data.ShowRackColumn {
                                            <td>
                                                <span class="badge bg-light text-dark">{volume.Rack}</span>
                                            </td>
                                        }
                                        if data.ShowCollectionColumn {
                                            <td>
                                                if volume.Collection == "" {
                                                    <a href={templ.SafeURL("/cluster/volumes?collection=default")} class="text-decoration-none">
                                                        <span class="badge bg-secondary">default</span>
                                                    </a>
                                                } else {
                                                    <a href={templ.SafeURL(fmt.Sprintf("/cluster/volumes?collection=%s", volume.Collection))} class="text-decoration-none">
                                                        <span class="badge bg-secondary">{volume.Collection}</span>
                                                    </a>
                                                }
                                            </td>
                                        }
                                                                <td>{formatBytes(int64(volume.Size))}</td>
                        <td>
                            <div class="d-flex align-items-center">
                                <div class="progress me-2" style="width: 80px; height: 16px; background-color: #e9ecef;">
                                    <!-- Active data (green) -->
                                    <div class="progress-bar bg-success" role="progressbar" 
                                         style={fmt.Sprintf("width: %.1f%%", 
                                             func() float64 {
                                                 if volume.Size > 0 {
                                                     activePct := float64(volume.Size - volume.DeletedByteCount) / float64(volume.Size) * 100
                                                     if data.VolumeSizeLimit > 0 {
                                                         return activePct * float64(volume.Size) / float64(data.VolumeSizeLimit) * 100
                                                     }
                                                     return activePct
                                                 }
                                                 return 0
                                             }())}
                                         title={fmt.Sprintf("Active: %s", formatBytes(int64(volume.Size - volume.DeletedByteCount)))}>
                                    </div>
                                    <!-- Garbage data (red) -->
                                    <div class="progress-bar bg-danger" role="progressbar" 
                                         style={fmt.Sprintf("width: %.1f%%", 
                                             func() float64 {
                                                 if volume.Size > 0 && volume.DeletedByteCount > 0 {
                                                     garbagePct := float64(volume.DeletedByteCount) / float64(volume.Size) * 100
                                                     if data.VolumeSizeLimit > 0 {
                                                         return garbagePct * float64(volume.Size) / float64(data.VolumeSizeLimit) * 100
                                                     }
                                                     return garbagePct
                                                 }
                                                 return 0
                                             }())}
                                         title={fmt.Sprintf("Garbage: %s", formatBytes(int64(volume.DeletedByteCount)))}>
                                    </div>
                                </div>
                                <small class="text-muted">
                                    {func() string {
                                        if data.VolumeSizeLimit > 0 {
                                            return fmt.Sprintf("%.0f%%", float64(volume.Size)/float64(data.VolumeSizeLimit)*100)
                                        }
                                        return "N/A"
                                    }()}
                                </small>
                            </div>
                        </td>
                        <td>{fmt.Sprintf("%d", volume.FileCount)}</td>
                        <td>
                            <span class="badge bg-info">{fmt.Sprintf("%03d", volume.ReplicaPlacement)}</span>
                        </td>
                                        if data.ShowDiskTypeColumn {
                                            <td>
                                                <span class="badge bg-primary">{volume.DiskType}</span>
                                            </td>
                                        }
                                        if data.ShowVersionColumn {
                                            <td>
                                                <span class="badge bg-dark">{fmt.Sprintf("v%d", volume.Version)}</span>
                                            </td>
                                        }
                                        <td>
                                            <div class="btn-group btn-group-sm">
                                                <button type="button" class="btn btn-outline-primary btn-sm view-details-btn" 
                                                        title="View Details" data-volume-id={fmt.Sprintf("%d", volume.Id)}>
                                                    <i class="fas fa-eye"></i>
                                                </button>
                                                <button type="button" class="btn btn-outline-secondary btn-sm vacuum-btn" 
                                                        title="Vacuum"
                                                        data-volume-id={fmt.Sprintf("%d", volume.Id)}
                                                        data-server={volume.Server}>
                                                    <i class="fas fa-compress-alt"></i>
                                                </button>
                                            </div>
                                        </td>
                                    </tr>
                                }
                            </tbody>
                        </table>
                    </div>
                    
                    <!-- Volume Summary -->
                    <div class="d-flex justify-content-between align-items-center mt-3">
                        <div>
                            <small class="text-muted">
                                Showing {fmt.Sprintf("%d", (data.CurrentPage-1)*data.PageSize + 1)} to {fmt.Sprintf("%d", minInt(data.CurrentPage*data.PageSize, data.TotalVolumes))} of {fmt.Sprintf("%d", data.TotalVolumes)} volumes
                            </small>
                        </div>
                        if data.TotalPages > 1 {
                            <div>
                                <small class="text-muted">
                                    Page {fmt.Sprintf("%d", data.CurrentPage)} of {fmt.Sprintf("%d", data.TotalPages)}
                                </small>
                            </div>
                        }
                    </div>
                    
                    <!-- Pagination Controls -->
                    if data.TotalPages > 1 {
                        <div class="d-flex justify-content-center mt-3">
                            <nav aria-label="Volumes pagination">
                                <ul class="pagination pagination-sm mb-0">
                                    <!-- Previous Button -->
                                    if data.CurrentPage > 1 {
                                        <li class="page-item">
                                            <a class="page-link pagination-link" href="#" data-page={fmt.Sprintf("%d", data.CurrentPage-1)}>
                                                <i class="fas fa-chevron-left"></i>
                                            </a>
                                        </li>
                                    } else {
                                        <li class="page-item disabled">
                                            <span class="page-link">
                                                <i class="fas fa-chevron-left"></i>
                                            </span>
                                        </li>
                                    }
                                    
                                    <!-- Page Numbers -->
                                    for i := maxInt(1, data.CurrentPage-2); i <= minInt(data.TotalPages, data.CurrentPage+2); i++ {
                                        if i == data.CurrentPage {
                                            <li class="page-item active">
                                                <span class="page-link">{fmt.Sprintf("%d", i)}</span>
                                            </li>
                                        } else {
                                            <li class="page-item">
                                                <a class="page-link pagination-link" href="#" data-page={fmt.Sprintf("%d", i)}>{fmt.Sprintf("%d", i)}</a>
                                            </li>
                                        }
                                    }
                                    
                                    <!-- Next Button -->
                                    if data.CurrentPage < data.TotalPages {
                                        <li class="page-item">
                                            <a class="page-link pagination-link" href="#" data-page={fmt.Sprintf("%d", data.CurrentPage+1)}>
                                                <i class="fas fa-chevron-right"></i>
                                            </a>
                                        </li>
                                    } else {
                                        <li class="page-item disabled">
                                            <span class="page-link">
                                                <i class="fas fa-chevron-right"></i>
                                            </span>
                                        </li>
                                    }
                                </ul>
                            </nav>
                        </div>
                    }
                } else {
                    <div class="text-center py-5">
                        <i class="fas fa-database fa-3x text-muted mb-3"></i>
                        <h5 class="text-muted">No Volumes Found</h5>
                        <p class="text-muted">No volumes are currently available in the cluster.</p>
                    </div>
                }
            </div>
        </div>

        <!-- Last Updated -->
        <div class="row">
            <div class="col-12">
                <small class="text-muted">
                    <i class="fas fa-clock me-1"></i>
                    Last updated: {data.LastUpdated.Format("2006-01-02 15:04:05")}
                </small>
            </div>
        </div>
    </div>
    
    <!-- JavaScript for pagination and sorting -->
    <script>
        // Initialize pagination links when page loads
        document.addEventListener('DOMContentLoaded', function() {
            // Add click handlers to pagination links
            document.querySelectorAll('.pagination-link').forEach(link => {
                link.addEventListener('click', function(e) {
                    e.preventDefault();
                    const page = this.getAttribute('data-page');
                    goToPage(page);
                });
            });
            
            // Add click handlers to view details buttons
            document.querySelectorAll('.view-details-btn').forEach(button => {
                button.addEventListener('click', function(e) {
                    e.preventDefault();
                    const volumeId = this.getAttribute('data-volume-id');
                    viewVolumeDetails(volumeId);
                });
            });

            // Add click handlers to volume ID links
            document.querySelectorAll('.volume-id-link').forEach(link => {
                link.addEventListener('click', function(e) {
                    e.preventDefault();
                    const volumeId = this.getAttribute('data-volume-id');
                    viewVolumeDetails(volumeId);
                });
            });

            // Add click handlers to vacuum buttons
            document.querySelectorAll('.vacuum-btn').forEach(button => {
                button.addEventListener('click', function(e) {
                    e.preventDefault();
                    const volumeId = this.getAttribute('data-volume-id');
                    const server = this.getAttribute('data-server');
                    performVacuum(volumeId, server, this);
                });
            });
        });
        
        function goToPage(page) {
            const url = new URL(window.location);
            url.searchParams.set('page', page);
            window.location.href = url.toString();
        }
        
        function changePageSize() {
            const pageSize = document.getElementById('pageSizeSelect').value;
            const url = new URL(window.location);
            url.searchParams.set('pageSize', pageSize);
            url.searchParams.set('page', '1'); // Reset to first page
            window.location.href = url.toString();
        }
        
        function sortTable(column) {
            const url = new URL(window.location);
            const currentSort = url.searchParams.get('sortBy');
            const currentOrder = url.searchParams.get('sortOrder') || 'asc';
            
            let newOrder = 'asc';
            if (currentSort === column && currentOrder === 'asc') {
                newOrder = 'desc';
            }
            
            url.searchParams.set('sortBy', column);
            url.searchParams.set('sortOrder', newOrder);
            url.searchParams.set('page', '1'); // Reset to first page
            window.location.href = url.toString();
        }
        
        function exportVolumes() {
            // TODO: Implement volume export functionality
            alert('Export functionality to be implemented');
        }
        
        function viewVolumeDetails(volumeId) {
            // Get the server from the current row - works for both buttons and volume ID links
            const clickedElement = event.target;
            const row = clickedElement.closest('tr');
            const serverCell = row.querySelector('td:nth-child(2) a');
            const server = serverCell ? serverCell.textContent.trim() : 'unknown';
            
            window.location.href = `/cluster/volumes/${volumeId}/${encodeURIComponent(server)}`;
        }

        function performVacuum(volumeId, server, button) {
            // Disable button and show loading state
            const originalHTML = button.innerHTML;
            button.disabled = true;
            button.innerHTML = '<i class="fas fa-spinner fa-spin"></i>';

            // Send vacuum request
            fetch(`/api/volumes/${volumeId}/${encodeURIComponent(server)}/vacuum`, {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json',
                }
            })
            .then(response => response.json())
            .then(data => {
                if (data.error) {
                    showMessage(data.error, 'error');
                } else {
                    showMessage(data.message || 'Volume vacuum started successfully', 'success');
                    // Optionally refresh the page after a delay to show updated vacuum status
                    setTimeout(() => {
                        window.location.reload();
                    }, 2000);
                }
            })
            .catch(error => {
                console.error('Error:', error);
                showMessage('Failed to start vacuum operation', 'error');
            })
            .finally(() => {
                // Re-enable button
                button.disabled = false;
                button.innerHTML = originalHTML;
            });
        }

        function showMessage(message, type) {
            // Create toast notification
            const toast = document.createElement('div');
            toast.className = `alert alert-${type === 'error' ? 'danger' : 'success'} alert-dismissible fade show position-fixed`;
            toast.style.top = '20px';
            toast.style.right = '20px';
            toast.style.zIndex = '9999';
            toast.style.minWidth = '300px';
            
            toast.innerHTML = `
                ${message}
                <button type="button" class="btn-close" data-bs-dismiss="alert"></button>
            `;
            
            document.body.appendChild(toast);
            
            // Auto-remove after 5 seconds
            setTimeout(() => {
                if (toast.parentNode) {
                    toast.parentNode.removeChild(toast);
                }
            }, 5000);
        }
    </script>
}

func countActiveVolumes(volumes []dash.VolumeWithTopology) int {
	// Since we removed status tracking, consider all volumes as active
	return len(volumes)
}

func countUniqueDataCenters(volumes []dash.VolumeWithTopology) int {
    dcMap := make(map[string]bool)
    for _, volume := range volumes {
        dcMap[volume.DataCenter] = true
    }
    return len(dcMap)
}

func countUniqueRacks(volumes []dash.VolumeWithTopology) int {
    rackMap := make(map[string]bool)
    for _, volume := range volumes {
        if volume.Rack != "" {
            rackMap[volume.Rack] = true
        }
    }
    return len(rackMap)
}

func countUniqueDiskTypes(volumes []dash.VolumeWithTopology) int {
    diskTypeMap := make(map[string]bool)
    for _, volume := range volumes {
        diskType := volume.DiskType
        if diskType == "" {
            diskType = "hdd"
        }
        diskTypeMap[diskType] = true
    }
    return len(diskTypeMap)
}



templ getSortIcon(column, currentSort, currentOrder string) {
    if column != currentSort {
        <i class="fas fa-sort text-muted ms-1"></i>
    } else if currentOrder == "asc" {
        <i class="fas fa-sort-up text-primary ms-1"></i>
    } else {
        <i class="fas fa-sort-down text-primary ms-1"></i>
    }
}

func minInt(a, b int) int {
    if a < b {
        return a
    }
    return b
}

func maxInt(a, b int) int {
    if a > b {
        return a
    }
    return b
}