namespace WebDrop.Core;

public sealed record Channel(
    Id16 Id,
    ChannelMode Mode,
    ChannelSettings Settings,
    byte[]? ReadHash,
    byte[]? WriteHash,
    byte[] OwnerHash,
    long CreatedAt,
    long ExpiresAt,
    long LastSeq,
    long CompactedThrough,
    long Bytes,
    string CreatorAccount,
    byte[]? JoinPasswordHash = null,
    byte[]? JoinPasswordSalt = null);

public sealed record Share(
    Id16 Id,
    ShareSettings Settings,
    byte[] ReadHash,
    byte[]? OwnerHash,
    byte[]? CreatorEndpointHash,
    long CreatedAt,
    long ExpiresAt,
    long? SealedAt,
    Id16? ManifestItemId,
    long Bytes,
    string CreatorAccount)
{
    public bool IsSealed => SealedAt is not null;
}

public sealed record ShareItem(
    Id16 ShareId,
    Id16 ItemId,
    FrameFlags Flags,
    long MaxDownloads,
    long Downloads,
    int FrameCount,
    long MaxIndex,
    long? FinalIndex,
    long Bytes,
    long CreatedAt,
    long ExpiresAt,
    long? CloseDeadline)
{
    public bool IsGated => (Flags & FrameFlags.Gated) != 0;
    public bool IsSnapshot => (Flags & FrameFlags.Snapshot) != 0;
    public bool IsComplete => FinalIndex is { } f && FrameCount == f + 1;
}

public sealed record ShareFrame(
    Id16 ShareId,
    Id16 ItemId,
    uint Index,
    long AckSeq,
    int Length,
    byte[] Digest,
    byte[]? Inline,
    string? BlobKey);

public sealed record Item(
    Id16 ChannelId,
    Id16 ItemId,
    byte[] AuthorHash,
    FrameFlags Flags,
    long MaxDownloads,
    long Downloads,
    int FrameCount,
    long MaxIndex,
    long? FinalIndex,
    long Bytes,
    long CreatedAt,
    long ExpiresAt,
    long? CloseDeadline,
    string? AuthorAccount)
{
    public bool IsGated => (Flags & FrameFlags.Gated) != 0;
    public bool IsSnapshot => (Flags & FrameFlags.Snapshot) != 0;
    public bool IsComplete => FinalIndex is { } f && FrameCount == f + 1;
}

public sealed record Seat(byte[] EndpointHash, long JoinedAt, byte[]? Label, string? AccountName = null, string? AccountDeviceId = null);
public sealed record ChannelInvitation(Id16 ChannelId, string Username, string Payload, long CreatedAt);
public sealed record ChannelMember(string Username, string Role, long JoinedAt);
public sealed record ChannelKeyPackage(Id16 ChannelId, string Username, string Role, string Payload, long CreatedAt);

/// <summary>已存储的一帧(完整封装)。Inline 与 BlobKey 二选一。</summary>
public sealed record StoredFrame(
    Id16 ChannelId,
    Id16 ItemId,
    uint Index,
    long Seq,
    int Length,
    byte[] Digest,
    byte[]? Inline,
    string? BlobKey);

public sealed record LogEntry(long Seq, LogKind Kind, Id16 ItemId, uint FrameIndex, byte Aux, long CreatedAt);

/// <summary>一次请求验证通过后的身份。</summary>
public sealed record Principal(Role Role, byte[] EndpointHash, string? AccountName = null);

/// <summary>请求携带的凭据,尚未验证。</summary>
public sealed record Credentials(Role ClaimedRole, byte[]? Token, byte[] EndpointHash, string? AccountName = null, string? AccountDeviceId = null,
    bool RequireSignedContent = false);