using System.Collections.Immutable;
using System.Text.Json.Serialization;

namespace StellaOps.Scanner.Emit.Composition;

/// <summary>
/// Reference to a per-layer SBOM stored in CAS.
/// </summary>
public sealed record LayerSbomRef
{
    /// <summary>
    /// The digest of the layer (e.g., "sha256:abc123...").
    /// </summary>
    [JsonPropertyName("layerDigest")]
    public required string LayerDigest { get; init; }

    /// <summary>
    /// The order of the layer in the image (0-indexed).
    /// </summary>
    [JsonPropertyName("order")]
    public required int Order { get; init; }

    /// <summary>
    /// SHA256 digest of the layer fragment (component list).
    /// </summary>
    [JsonPropertyName("fragmentDigest")]
    public required string FragmentDigest { get; init; }

    /// <summary>
    /// SHA256 digest of the CycloneDX SBOM for this layer.
    /// </summary>
    [JsonPropertyName("cycloneDxDigest")]
    public required string CycloneDxDigest { get; init; }

    /// <summary>
    /// CAS URI of the CycloneDX SBOM.
    /// </summary>
    [JsonPropertyName("cycloneDxCasUri")]
    public required string CycloneDxCasUri { get; init; }

    /// <summary>
    /// SHA256 digest of the SPDX SBOM for this layer.
    /// </summary>
    [JsonPropertyName("spdxDigest")]
    public required string SpdxDigest { get; init; }

    /// <summary>
    /// CAS URI of the SPDX SBOM.
    /// </summary>
    [JsonPropertyName("spdxCasUri")]
    public required string SpdxCasUri { get; init; }

    /// <summary>
    /// Number of components in this layer.
    /// </summary>
    [JsonPropertyName("componentCount")]
    public required int ComponentCount { get; init; }
}

/// <summary>
/// Result of generating per-layer SBOMs.
/// </summary>
public sealed record LayerSbomResult
{
    /// <summary>
    /// References to all per-layer SBOMs, ordered by layer order.
    /// </summary>
    [JsonPropertyName("layerSboms")]
    public required ImmutableArray<LayerSbomRef> LayerSboms { get; init; }

    /// <summary>
    /// Merkle root computed from all layer SBOM digests.
    /// </summary>
    [JsonPropertyName("merkleRoot")]
    public required string MerkleRoot { get; init; }
}

/// <summary>
/// Artifact bytes for a single layer's SBOM.
/// </summary>
public sealed record LayerSbomArtifact
{
    /// <summary>
    /// The layer digest this SBOM represents.
    /// </summary>
    public required string LayerDigest { get; init; }

    /// <summary>
    /// CycloneDX JSON bytes.
    /// </summary>
    public required byte[] CycloneDxJsonBytes { get; init; }

    /// <summary>
    /// SHA256 of CycloneDX JSON.
    /// </summary>
    public required string CycloneDxDigest { get; init; }

    /// <summary>
    /// SPDX JSON bytes.
    /// </summary>
    public required byte[] SpdxJsonBytes { get; init; }

    /// <summary>
    /// SHA256 of SPDX JSON.
    /// </summary>
    public required string SpdxDigest { get; init; }

    /// <summary>
    /// Number of components in this layer.
    /// </summary>
    public required int ComponentCount { get; init; }
}