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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.// Copyright Joyent, Inc. and other Node contributors.
import { ArrayPrototypeJoin, ArrayPrototypePush } from "../primordials.mjs";
import { CSI } from "./utils.mjs";import { validateBoolean, validateInteger } from "../validators.mjs";import { isWritable } from "../streams/utils.mjs";import { ERR_INVALID_ARG_TYPE } from "../errors.ts";
const {  kClearToLineBeginning,  kClearToLineEnd,  kClearLine,  kClearScreenDown,} = CSI;
export class Readline {  #autoCommit = false;  #stream;  #todo = [];
  constructor(stream, options = undefined) {    if (!isWritable(stream)) {      throw new ERR_INVALID_ARG_TYPE("stream", "Writable", stream);    }    this.#stream = stream;    if (options?.autoCommit != null) {      validateBoolean(options.autoCommit, "options.autoCommit");      this.#autoCommit = options.autoCommit;    }  }
  /**   * Moves the cursor to the x and y coordinate on the given stream.   * @param {integer} x   * @param {integer} [y]   * @returns {Readline} this   */  cursorTo(x, y = undefined) {    validateInteger(x, "x");    if (y != null) validateInteger(y, "y");
    const data = y == null ? CSI`${x + 1}G` : CSI`${y + 1};${x + 1}H`;    if (this.#autoCommit) process.nextTick(() => this.#stream.write(data));    else ArrayPrototypePush(this.#todo, data);
    return this;  }
  /**   * Moves the cursor relative to its current location.   * @param {integer} dx   * @param {integer} dy   * @returns {Readline} this   */  moveCursor(dx, dy) {    if (dx || dy) {      validateInteger(dx, "dx");      validateInteger(dy, "dy");
      let data = "";
      if (dx < 0) {        data += CSI`${-dx}D`;      } else if (dx > 0) {        data += CSI`${dx}C`;      }
      if (dy < 0) {        data += CSI`${-dy}A`;      } else if (dy > 0) {        data += CSI`${dy}B`;      }      if (this.#autoCommit) process.nextTick(() => this.#stream.write(data));      else ArrayPrototypePush(this.#todo, data);    }    return this;  }
  /**   * Clears the current line the cursor is on.   * @param {-1|0|1} dir Direction to clear:   *   -1 for left of the cursor   *   +1 for right of the cursor   *    0 for the entire line   * @returns {Readline} this   */  clearLine(dir) {    validateInteger(dir, "dir", -1, 1);
    const data = dir < 0      ? kClearToLineBeginning      : dir > 0      ? kClearToLineEnd      : kClearLine;    if (this.#autoCommit) process.nextTick(() => this.#stream.write(data));    else ArrayPrototypePush(this.#todo, data);    return this;  }
  /**   * Clears the screen from the current position of the cursor down.   * @returns {Readline} this   */  clearScreenDown() {    if (this.#autoCommit) {      process.nextTick(() => this.#stream.write(kClearScreenDown));    } else {      ArrayPrototypePush(this.#todo, kClearScreenDown);    }    return this;  }
  /**   * Sends all the pending actions to the associated `stream` and clears the   * internal list of pending actions.   * @returns {Promise<void>} Resolves when all pending actions have been   * flushed to the associated `stream`.   */  commit() {    return new Promise((resolve) => {      this.#stream.write(ArrayPrototypeJoin(this.#todo, ""), resolve);      this.#todo = [];    });  }
  /**   * Clears the internal list of pending actions without sending it to the   * associated `stream`.   * @returns {Readline} this   */  rollback() {    this.#todo = [];    return this;  }}
export default Readline;