// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
 
using System.Collections.Immutable;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.SQLite.v2.Interop;
using Microsoft.CodeAnalysis.Storage;
 
namespace Microsoft.CodeAnalysis.SQLite.v2
{
    using static SQLitePersistentStorageConstants;
 
    internal partial class SQLitePersistentStorage
    {
        public override Task<bool> ChecksumMatchesAsync(string name, Checksum checksum, CancellationToken cancellationToken)
            => _solutionAccessor.ChecksumMatchesAsync(_solutionKey, name, checksum, cancellationToken);
 
        public override Task<Stream?> ReadStreamAsync(string name, Checksum? checksum, CancellationToken cancellationToken)
            => _solutionAccessor.ReadStreamAsync(_solutionKey, name, checksum, cancellationToken);
 
        public override Task<bool> WriteStreamAsync(string name, Stream stream, Checksum? checksum, CancellationToken cancellationToken)
            => _solutionAccessor.WriteStreamAsync(_solutionKey, name, stream, checksum, cancellationToken);
 
        private readonly record struct SolutionPrimaryKey();
 
        /// <summary>
        /// <see cref="Accessor{TKey, TDatabaseId}"/> responsible for storing and 
        /// retrieving data from <see cref="SolutionDataTableName"/>.  Note that with the Solution 
        /// table there is no need for key->id translation.  i.e. the key acts as the ID itself.
        /// </summary>
        private sealed class SolutionAccessor : Accessor<SolutionKey, SolutionPrimaryKey>
        {
            public SolutionAccessor(SQLitePersistentStorage storage)
                : base(Table.Solution,
                      storage)
            {
            }
 
            // For the SolutionDataTable the key itself acts as the data-id.
            protected override SolutionPrimaryKey? TryGetDatabaseKey(SqlConnection connection, SolutionKey key, bool allowWrite)
                => new SolutionPrimaryKey();
 
            protected override void BindAccessorSpecificPrimaryKeyParameters(SqlStatement statement, SolutionPrimaryKey primaryKey)
            {
                // nothing to do.  A solution row just needs the id of the data-name (which the caller handles).
            }
        }
    }
}