import { BufferLocation, BufferSize, Char, Color } from "./base.ts";

/**
 * Display protocol, to allow the UI to draw things on "screen"
 */
export class Display {
  /**
   * Init the display (will be the first method called)
   */
  async init(): Promise<void> {
  }

  /**
   * Restore the display as before *init*
   */
  async uninit(): Promise<void> {
  }

  /**
   * Get the current grid size
   */
  async getSize(): Promise<BufferSize> {
    return { w: 0, h: 0 };
  }

  /**
   * Setup the palette for color display
   *
   * If the display supports the whole RGB range, it may return the array as-is.
   * If the display only supports a limited palette, it may return only supported colors.
   *
   * From this call forward, colors will be received by numbered index in the returned array.
   */
  async setupPalette(colors: readonly Color[]): Promise<readonly Color[]> {
    return [];
  }

  /**
   * Set the cursor visibility
   */
  async setCursorVisibility(visible: boolean): Promise<void> {
  }

  /**
   * Flush the display
   */
  async flush(): Promise<void> {
  }

  /**
   * Draw a single character on screen
   */
  async setChar(at: BufferLocation, char: Char): Promise<void> {
  }

  /**
   * Get the keys pressed since last call
   */
  async getKeyStrokes(): Promise<string[]> {
    return [];
  }
}