@startuml
!theme plain
title Turnstone — Client SDK Architecture

skinparam class {
    BackgroundColor<<async>> #C8E6C9
    BackgroundColor<<sync>> #B8D4E3
    BackgroundColor<<event>> #FFE0B2
    BackgroundColor<<type>> #F0F4C3
    BackgroundColor<<ts>> #E1BEE7
}

skinparam packageBorderColor #888888
skinparam ArrowColor #555555

' Python SDK
package "turnstone/sdk/ (Python)" {
    abstract class _BaseClient <<async>> {
        - _client: httpx.AsyncClient
        - _owns_client: bool
        + _request(method, path, ...) → T
        + _stream_sse(path, ...) → AsyncIterator
        + aclose()
    }

    class AsyncTurnstoneServer <<async>> {
        + list_workstreams()
        + dashboard()
        + create_workstream()
        + close_workstream()
        + send(message, ws_id)
        + approve()
        + command()
        + cancel(ws_id)
        + stream_events(ws_id)
        + stream_global_events()
        + send_and_wait()
        + list_saved_workstreams()
        + login() / logout()
        + health()
    }

    class AsyncTurnstoneConsole <<async>> {
        + overview()
        + nodes()
        + workstreams()
        + node_detail()
        + snapshot()
        + create_workstream()
        + stream_cluster_events()
        + login() / logout()
        + health()
    }

    class TurnstoneServer <<sync>> {
        - _async: AsyncTurnstoneServer
        - _runner: _SyncRunner
        .. delegates all methods ..
        + __enter__ / __exit__
    }

    class TurnstoneConsole <<sync>> {
        - _async: AsyncTurnstoneConsole
        - _runner: _SyncRunner
        .. delegates all methods ..
        + __enter__ / __exit__
    }

    class _SyncRunner <<sync>> {
        - _loop: EventLoop
        - _thread: Thread
        + run(coro) → T
        + run_iter(async_gen) → Iterator
        + close()
    }

    class TurnResult <<type>> {
        + ws_id: str
        + content_parts: list[str]
        + reasoning_parts: list[str]
        + tool_results: list
        + errors: list[str]
        + timed_out: bool
        --
        + content: str
        + reasoning: str
        + ok: bool
    }

    class ServerEvent <<event>> {
        + type: str
        + ws_id: str
        + from_dict() → ServerEvent
    }

    class ClusterEvent <<event>> {
        + type: str
        + from_dict() → ClusterEvent
    }

    _BaseClient <|-- AsyncTurnstoneServer
    _BaseClient <|-- AsyncTurnstoneConsole
    TurnstoneServer --> AsyncTurnstoneServer : wraps
    TurnstoneServer --> _SyncRunner : uses
    TurnstoneConsole --> AsyncTurnstoneConsole : wraps
    TurnstoneConsole --> _SyncRunner : uses
    AsyncTurnstoneServer ..> TurnResult : returns
    AsyncTurnstoneServer ..> ServerEvent : yields
    AsyncTurnstoneConsole ..> ClusterEvent : yields
}

' TypeScript SDK
package "sdk/typescript/ (TypeScript)" {
    class "BaseClient" as TSBase <<ts>> {
        # baseUrl: string
        # token: string
        # fetchFn: fetch
        # request<T>()
        # streamSSE<T>()
    }

    class "TurnstoneServer" as TSServer <<ts>> {
        + listWorkstreams()
        + send()
        + streamEvents()
        + sendAndWait()
        ...
    }

    class "TurnstoneConsole" as TSConsole <<ts>> {
        + overview()
        + nodes()
        + snapshot()
        + clusterEvents()
        ...
    }

    TSBase <|-- TSServer
    TSBase <|-- TSConsole
}

' External connections
class "turnstone-server :8080" as Server <<artifact>>
class "turnstone-console :8081" as Console <<artifact>>

AsyncTurnstoneServer --> Server : httpx REST + SSE
AsyncTurnstoneConsole --> Console : httpx REST + SSE
TSServer --> Server : fetch REST + SSE
TSConsole --> Console : fetch REST + SSE

note right of AsyncTurnstoneServer
  Returns Pydantic models from
  turnstone.api.server_schemas
  (no type duplication)
end note

@enduml