// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

namespace Microsoft.NET.Build.Containers;

/// <summary>
/// Represents constructed image ready for further processing.
/// </summary>
internal readonly struct BuiltImage
{
    /// <summary>
    /// Gets image configuration in JSON format.
    /// </summary>
    internal required string Config { get; init; }

    /// <summary>
    /// Gets image digest.
    /// </summary>
    internal string? ImageDigest { get; init; }

    /// <summary>
    /// Gets image SHA.
    /// </summary>
    internal string? ImageSha { get; init; }

    /// <summary>
    /// Gets image manifest.
    /// </summary>
    internal required string Manifest { get; init; } 

    /// <summary>
    /// Gets manifest digest.
    /// </summary>
    internal required string ManifestDigest { get; init; }

    /// <summary>
    /// Gets manifest mediaType.
    /// </summary>
    internal required string ManifestMediaType { get; init; }

    /// <summary>
    /// Gets image layers.
    /// </summary>
    internal List<ManifestLayer>? Layers { get; init; }

    /// <summary>
    /// Gets image OS.
    /// </summary>
    internal string? OS { get; init; }

    /// <summary>
    /// Gets image architecture.
    /// </summary>
    internal string? Architecture { get; init; }

    /// <summary>
    /// Gets layers descriptors.
    /// </summary>
    internal IEnumerable<Descriptor> LayerDescriptors
    {
        get
        {
            List<ManifestLayer> layersNode = Layers ?? throw new NotImplementedException("Tried to get layer information but there is no layer node?");
            foreach (ManifestLayer layer in layersNode)
            {
                yield return new(layer.mediaType, layer.digest, layer.size);
            }
        }
    }
}