/**
 * The chat column's view state, as the page passes it down.
 *
 * It is deliberately a plain shape: the page derives it from the URL (see
 * `pages/workspace/model/chat-location`) and hands back a patcher, so the
 * feature never imports react-router and never learns what a query string is.
 * That is also what keeps every panel, thread and jump deep-linkable.
 */
export type ChatPanelKind = 'thread' | 'pins' | 'threads' | 'members' | null

export interface ChatViewState {
  /** Which right-hand column is open; `null` leaves just the transcript. */
  panel: ChatPanelKind
  /** Set with `panel: 'thread'`; the thread's own id. */
  threadId?: string
  /** One-shot targets: the view consumes them and clears the URL entry. */
  replyToId?: string
  editId?: string
  jumpId?: string
}

/** Defaults are omitted from the URL, so a plain room reads `/app/x/chat/<id>`. */
export const CHAT_VIEW_DEFAULTS: ChatViewState = { panel: null }