import { Color, Display } from "./display.ts";

/**
 * ANSI terminal display
 */
export class AnsiTerminalDisplay implements Display {
  constructor(private writer: Deno.Writer = Deno.stdout) {
  }

  async setupPalette(colors: readonly Color[]): Promise<readonly Color[]> {
    return colors;
  }

  async clear(): Promise<void> {
    await this.writer.write(CLEAR);
  }
}

function escape(sequence: string): Uint8Array {
  return new Uint8Array([0x1B, ...new TextEncoder().encode(sequence)]);
}

const CLEAR = escape("[2J");