/**
 * Copyright (c) 2019 The xterm.js authors. All rights reserved.
 * @license MIT
 */

import { IDisposable } from 'common/Types';
import { IColorSet } from 'browser/Types';

export type CharacterJoinerHandler = (text: string) => [number, number][];

export interface IRenderDimensions {
  scaledCharWidth: number;
  scaledCharHeight: number;
  scaledCellWidth: number;
  scaledCellHeight: number;
  scaledCharLeft: number;
  scaledCharTop: number;
  scaledCanvasWidth: number;
  scaledCanvasHeight: number;
  canvasWidth: number;
  canvasHeight: number;
  actualCellWidth: number;
  actualCellHeight: number;
}

/**
 * Note that IRenderer implementations should emit the refresh event after
 * rendering rows to the screen.
 */
export interface IRenderer extends IDisposable {
  readonly dimensions: IRenderDimensions;

  dispose(): void;
  setColors(colors: IColorSet): void;
  onDevicePixelRatioChange(): void;
  onResize(cols: number, rows: number): void;
  onCharSizeChanged(): void;
  onBlur(): void;
  onFocus(): void;
  onSelectionChanged(start: [number, number], end: [number, number], columnSelectMode: boolean): void;
  onCursorMove(): void;
  onOptionsChanged(): void;
  clear(): void;
  renderRows(start: number, end: number): void;
  registerCharacterJoiner(handler: CharacterJoinerHandler): number;
  deregisterCharacterJoiner(joinerId: number): boolean;
}

export interface ICharacterJoiner {
  id: number;
  handler: CharacterJoinerHandler;
}

export interface ICharacterJoinerRegistry {
  registerCharacterJoiner(handler: (text: string) => [number, number][]): number;
  deregisterCharacterJoiner(joinerId: number): boolean;
  getJoinedCharacters(row: number): [number, number][];
}