using System.Text.Json.Serialization;

namespace Fleet.Rpc;

/// <summary>
/// 节点间点对点会话的握手（拨号方 → 监听方，TLS 帧）。除了签名认证，双方各生成一个临时 ECDH 密钥，
/// 经过 HKDF 派生出数据面使用的 <c>session_id</c> 与 <c>session_key</c>（所以不需要单独的“下发密钥”方法）。
/// </summary>
public static class PeerMethods
{
    public const string Challenge = "fleet.peer.challenge";
    public const string Auth = "fleet.peer.auth";
}

public sealed class PeerChallengeParams
{
    [JsonPropertyName("nonce")]
    public string Nonce { get; set; } = "";

    /// <summary>服务端（监听方）的临时 ECDH 公钥（SPKI，base64）。</summary>
    [JsonPropertyName("ecdh_pub")]
    public string EcdhPublicKey { get; set; } = "";
}

public sealed class PeerAuthParams
{
    [JsonPropertyName("peer_id")]
    public string PeerId { get; set; } = "";

    /// <summary>发起方的临时 ECDH 公钥（SPKI，base64）。</summary>
    [JsonPropertyName("ecdh_pub")]
    public string EcdhPublicKey { get; set; } = "";

    /// <summary>对 <c>fleet|v1|peer|{peer_id}|{nonce}|{client_ecdh_pub}|{server_ecdh_pub}</c> 的签名（base64）。</summary>
    [JsonPropertyName("signature")]
    public string Signature { get; set; } = "";

    /// <summary>发起方的程序版本（可选，只用于展示）。</summary>
    [JsonPropertyName("version")]
    public string? Version { get; set; }
}

public sealed class PeerAuthResult
{
    [JsonPropertyName("session_id")]
    public string SessionId { get; set; } = "";
}

[JsonSerializable(typeof(PeerChallengeParams))]
[JsonSerializable(typeof(PeerAuthParams))]
[JsonSerializable(typeof(PeerAuthResult))]
public sealed partial class PeerRpcContext : JsonSerializerContext;