export interface McpcTheme {
  fg(color: string, text: string): string;
  bold(text: string): string;
}

export interface McpcKeybindings {
  matches(data: string, keybinding: "tui.select.up" | "tui.select.down" | "tui.select.cancel"): boolean;
}

export interface McpcTui {
  requestRender(): void;
}

export interface McpcUi {
  notify(message: string, level?: "info" | "warning" | "error"): void;
  custom<T>(
    factory: (
      tui: McpcTui,
      theme: McpcTheme,
      keybindings: McpcKeybindings,
      done: (result: T) => void,
    ) => {
      render(width: number): string[];
      handleInput?(data: string): void;
      invalidate(): void;
      dispose?(): void;
    },
    options?: {
      overlay?: boolean;
      overlayOptions?: { anchor?: string; width?: number | string; minWidth?: number; maxHeight?: number | string };
    },
  ): Promise<T>;
}

export interface McpcContext {
  cwd: string;
  mode: "tui" | "rpc" | "json" | "print";
  hasUI: boolean;
  ui: McpcUi;
}

export interface McpcCommandContext extends McpcContext {
  reload(): Promise<void>;
}

export interface McpcCommandOptions {
  description: string;
  getArgumentCompletions?: (prefix: string) => Array<{ value: string; label: string }> | null;
  handler(args: string, ctx: McpcCommandContext): Promise<void> | void;
}

export interface McpcExtensionApi {
  registerCommand(name: string, options: McpcCommandOptions): void;
  on(event: "session_start", handler: (event: unknown, ctx: McpcContext) => Promise<void> | void): void;
}