import { Block } from './Block';

/**
 * Interface for handling default functionality for moving around the screen
 */
export interface Navigator {
  content: string;
  navigationBlocks: Block[];
  selectedBlockIdx: number;

  /**
   * Set the navigational content
   * @param content original unparsed content for display
   * @param blocks for navigation handling
   */
  setContent(content: string, blocks: Block[]): void;

  /**
   * Start up the program and interface
   * @param command array of command line arguments for git command to run
   * @return content of run command used to parse for navigation
   */
  key(keys: string[], listener: () => void): void;

  /**
   * @return the currently selected block
   */
  getSelectedBlock(): Block;

  /**
   * Navigate to the next block index relative to the selection
   */
  navigateNext(count?: number): void;

  /**
   * Navigate to the previous block index relative to the selection
   */
  navigatePrev(count?: number): void;

  /**
   * Navigate to the selected block index
   */
  navigateTo(blockIdx: number): void;

  /**
   * Changes the validity of the selected block
   */
  changeSelectedBlockValidity(validity: boolean): void;

  /**
   * Removes the specified block
   */
  removeBlock(block: number): void;

  /**
   * Create a textbox for specifying search input for navigation
   */
  displaySearchInput(): void;

  /**
   * Create a text prompt
   */
  ask(text: string, cb: Function): void;

  /**
   * Clear the screen
   */
  clear(): void;
}