// Copyright 2020 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// [START spanner_list_database_operations]

using Google.Cloud.Spanner.Admin.Database.V1;
using Google.Cloud.Spanner.Common.V1;
using Google.LongRunning;
using System;
using System.Collections.Generic;
using System.Linq;

public class ListDatabaseOperationsSample
{
    public IEnumerable<Operation> ListDatabaseOperations(string projectId, string instanceId)
    {
        // Create the DatabaseAdminClient instance.
        DatabaseAdminClient databaseAdminClient = DatabaseAdminClient.Create();

        var filter = "(metadata.@type:type.googleapis.com/google.spanner.admin.database.v1.OptimizeRestoredDatabaseMetadata)";

        ListDatabaseOperationsRequest request = new ListDatabaseOperationsRequest
        {
            ParentAsInstanceName = InstanceName.FromProjectInstance(projectId, instanceId),
            Filter = filter
        };

        // List the optimize restored databases operations on the instance.
        var operations = databaseAdminClient.ListDatabaseOperations(request);

        // We print the first 5 elements for demonstration purposes.
        // You can print all operations in the sequence by removing the call to Take(5).
        // The sequence will lazily fetch elements in pages as needed.
        foreach (var operation in operations.Take(5))
        {
            OptimizeRestoredDatabaseMetadata metadata =
                operation.Metadata.Unpack<OptimizeRestoredDatabaseMetadata>();
            Console.WriteLine(
                $"Database {metadata.Name} restored from backup is {metadata.Progress.ProgressPercent}% optimized.");
        }

        return operations;
    }
}
// [END spanner_list_database_operations]
