syntax = "proto3";
package tai.tunnel;
option go_package = "github.com/yaoapp/yao/tai/tunnel/taipb";

service TaiTunnel {
    // Control plane: Tai → Yao, register + keepalive + receive commands.
    rpc Register(stream TunnelControl) returns (stream TunnelControl);

    // Data plane: Tai → Yao, raw TCP forwarding.
    rpc Forward(stream ForwardData) returns (stream ForwardData);
}

message TunnelControl {
    string type = 1; // "register" / "registered" / "open" / "ping" / "pong"

    // Carried on "register" (Tai → Yao)
    string node_id      = 2;
    string machine_id   = 3;
    string display_name = 4;
    string version      = 5;
    Ports  ports        = 6;
    Capabilities caps   = 7;
    SystemInfo system   = 8;

    // Carried on "open" (Yao → Tai)
    string channel_id   = 10;
    int32  target_port  = 11;

    // Carried on "registered" (Yao → Tai)
    string tai_id       = 20;
}

message ForwardData {
    bytes data = 1;
}

message Ports {
    int32 grpc   = 1;
    int32 http   = 2;
    int32 vnc    = 3;
    int32 docker = 4;
    int32 k8s    = 5;
}

message Capabilities {
    bool docker    = 1;
    bool k8s       = 2;
    bool host_exec = 3;
}

message SystemInfo {
    string os       = 1;
    string arch     = 2;
    string hostname = 3;
    string shell    = 4;
}