// 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.Runtime.Serialization;
using Microsoft.CodeAnalysis.Host;

namespace Microsoft.CodeAnalysis.Storage;

/// <summary>
/// Handle that can be used with <see cref="IChecksummedPersistentStorage"/> to read data for a
/// <see cref="Project"/> without needing to have the entire <see cref="Project"/> snapshot available.
/// This is useful for cases where acquiring an entire snapshot might be expensive (for example, during 
/// solution load), but querying the data is still desired.
/// </summary>
[DataContract]
internal readonly struct ProjectKey(SolutionKey solution, ProjectId id, string? filePath, string name, Checksum parseOptionsChecksum)
{
    [DataMember(Order = 0)]
    public readonly SolutionKey Solution = solution;

    [DataMember(Order = 1)]
    public readonly ProjectId Id = id;

    [DataMember(Order = 2)]
    public readonly string? FilePath = filePath;

    [DataMember(Order = 3)]
    public readonly string Name = name;

    [DataMember(Order = 4)]
    public readonly Checksum ParseOptionsChecksum = parseOptionsChecksum;

    public static ProjectKey ToProjectKey(Project project)
        => ToProjectKey(project.Solution.SolutionState, project.State);

    public static ProjectKey ToProjectKey(SolutionState solutionState, ProjectState projectState)
        => ToProjectKey(SolutionKey.ToSolutionKey(solutionState), projectState);

    public static ProjectKey ToProjectKey(SolutionKey solutionKey, ProjectState projectState)
        => new(solutionKey, projectState.Id, projectState.FilePath, projectState.Name, projectState.GetParseOptionsChecksum());
}