syntax = "proto3";
package sunbeam.code.v1;

// Sol's coding agent service. Bidirectional streaming between
// the `sunbeam code` TUI client and Sol's server-side agent loop.
service CodeAgent {
  rpc Session(stream ClientMessage) returns (stream ServerMessage);
}

// ── Client → Sol ───────────────────────────────────────────────

message ClientMessage {
  oneof payload {
    StartSession start = 1;
    UserInput input = 2;
    ToolResult tool_result = 3;
    ToolApproval approval = 4;
    EndSession end = 5;
  }
}

message StartSession {
  string project_path = 1;
  string prompt_md = 2;
  string config_toml = 3;
  string git_branch = 4;
  string git_status = 5;
  repeated string file_tree = 6;
  string model = 7;
  repeated ToolDef client_tools = 8;
}

message UserInput {
  string text = 1;
}

message ToolResult {
  string call_id = 1;
  string result = 2;
  bool is_error = 3;
}

message ToolApproval {
  string call_id = 1;
  bool approved = 2;
}

message EndSession {}

// ── Sol → Client ───────────────────────────────────────────────

message ServerMessage {
  oneof payload {
    SessionReady ready = 1;
    TextDelta delta = 2;
    TextDone done = 3;
    ToolCall tool_call = 4;
    ApprovalNeeded approval = 5;
    Status status = 6;
    SessionEnd end = 7;
    Error error = 8;
  }
}

message SessionReady {
  string session_id = 1;
  string room_id = 2;
  string model = 3;
  bool resumed = 4;
  repeated HistoryEntry history = 5;
}

message HistoryEntry {
  string role = 1;    // "user" or "assistant"
  string content = 2;
}

message TextDelta {
  string text = 1;
}

message TextDone {
  string full_text = 1;
  uint32 input_tokens = 2;
  uint32 output_tokens = 3;
}

message ToolCall {
  string call_id = 1;
  string name = 2;
  string args_json = 3;
  bool is_local = 4;
  bool needs_approval = 5;
}

message ApprovalNeeded {
  string call_id = 1;
  string name = 2;
  string args_json = 3;
  string summary = 4;
}

message Status {
  string message = 1;
  StatusKind kind = 2;
}

enum StatusKind {
  INFO = 0;
  TOOL_RUNNING = 1;
  TOOL_DONE = 2;
  THINKING = 3;
}

message SessionEnd {
  string summary = 1;
}

message Error {
  string message = 1;
  bool fatal = 2;
}

message ToolDef {
  string name = 1;
  string description = 2;
  string schema_json = 3;
}