'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

var math = require('@aryth/math');
var enumDataTypes = require('@typen/enum-data-types');
var nullish = require('@typen/nullish');
var promises = require('timers/promises');
var backend = require('@arpel/backend');
var _escape = require('@arpel/escape');
var enumControlChars = require('@pres/enum-control-chars');
var rl = require('readline');

function _interopNamespace(e) {
  if (e && e.__esModule) return e;
  var n = Object.create(null);
  if (e) {
    Object.keys(e).forEach(function (k) {
      if (k !== 'default') {
        var d = Object.getOwnPropertyDescriptor(e, k);
        Object.defineProperty(n, k, d.get ? d : {
          enumerable: true,
          get: function () { return e[k]; }
        });
      }
    });
  }
  n["default"] = e;
  return Object.freeze(n);
}

var rl__namespace = /*#__PURE__*/_interopNamespace(rl);

const trailZero = num => {
  if (!num) return '0';
  const tx = '' + math.roundD2(num);
  let i = tx.indexOf('.');

  if (!~i) {
    return tx + '.00';
  }

  const trail = tx.length - i;

  if (trail === 3) {
    return tx;
  }

  if (trail === 2) {
    return tx + '0';
  }

  if (trail === 1) {
    return tx + '00';
  }

  return tx;
};
const pad3 = tx => {
  const len = tx.length;

  if (len === 3) {
    return tx;
  }

  if (len === 2) {
    return ' ' + tx;
  }

  if (len === 1) {
    return '  ' + tx;
  }

  if (len === 0) {
    return '   ';
  }

  return tx;
};
const base3ToScale = (base3, dec) => {
  if (base3 === 0) return 'B'; //

  if (base3 === 1) return dec ? 'K' : 'KB'; // Kilo

  if (base3 === 2) return dec ? 'M' : 'MB'; // Mega

  if (base3 === 3) return dec ? 'G' : 'GB'; // Giga

  if (base3 === 4) return dec ? 'T' : 'TB'; // Tera

  if (base3 === 5) return dec ? 'P' : 'PB'; // Peta

  if (base3 === 6) return dec ? 'E' : 'EB'; // Exa

  if (base3 === 7) return dec ? 'Z' : 'ZB'; // Zetta

  if (base3 === 8) return dec ? 'Y' : 'YB'; // Yotta
};

const DEFAULT_SENTENCE = 'progress [{bar}] {progress}% | ETA: {eta}s | {value}/{total}';
class Layout {
  /**
   * @param {object}                        [options]
   * @param {number}                        [options.size]                size of the progressbar in chars
   * @param {string[]|string}               [options.char]
   * @param {string}                        [options.glue]
   * @param {string}                        [options.sentence]
   * @param {boolean}                       [options.autoZero = false]     autoZero - false
   * @param {function(State):string}        [options.bar]
   * @param {function(State):string}        [options.degree]
   * @param {function(State,object):string} [options.format]
   */
  constructor(options) {
    const char = typeof options.char === enumDataTypes.STR ? [options.char, ' '] : Array.isArray(options.char) ? options.char : ['=', '-'];
    const [x, y] = char;
    this.size = options.size ?? 24;
    this.chars = [x.repeat(this.size + 1), y.repeat(this.size + 1)];
    this.glue = options.glue ?? '';
    this.autoZero = options.autoZero ?? false; // autoZero - false

    this.sentence = options.sentence ?? DEFAULT_SENTENCE;
    if (options.bar) this.bar = options.bar.bind(this);
    if (options.degree) this.degree = options.degree.bind(this);
    if (options.format) this.format = options.format.bind(this);
  }

  static build(options) {
    return new Layout(options);
  }

  bar(state) {
    const {
      progress
    } = state;
    const {
      chars,
      glue,
      size
    } = this;
    const lenX = math.round(progress * size),
          lenY = size - lenX;
    const [x, y] = chars; // generate bar string by stripping the pre-rendered strings

    return x.slice(0, lenX) + glue + y.slice(0, lenY);
  }

  get fullBar() {
    return this.chars[0].slice(0, this.size);
  }

  get zeroBar() {
    return this.chars[1].slice(0, this.size);
  }

  degree(state) {
    let {
      value,
      total
    } = state;
    const {
      base3 = true,
      decimal = false
    } = this;
    if (!base3) return `${math.round(value)}/${total}`;
    const thousand = decimal ? 1000 : 1024;
    let base3Level = 0;

    while (total > thousand) {
      // base3Level <= base3
      total /= thousand;
      value /= thousand;
      base3Level++;
    }

    const t = trailZero(total);
    const v = trailZero(value).padStart(t.length); // return { value: valueText, total: totalText, scale: base3ToScale(base3, dec) }

    return `${v}/${t} ${base3ToScale(base3Level, decimal)}`;
  }
  /**
   *
   * @param {State|object} state
   * @returns {string}
   */


  format(state) {
    var _this$sentence;

    return (_this$sentence = this.sentence) === null || _this$sentence === void 0 ? void 0 : _this$sentence.replace(/\{(\w+)\}/g, (match, key) => {
      if (key === 'bar') return this.bar(state);
      if (key === 'degree') return this.degree(state);
      if (key in state) return state[key];
      return match;
    });
  }

}

class Config {
  /**
   *
   * @param {object} config
   *
   * @param {ReadStream}   [config.input = process.stdin]   the output stream to read from
   * @param {WriteStream}  [config.output = process.stdout] the output stream to write on
   * @param {number}       [config.fps = 12]                the max update rate in fps (redraw will only triggered on value change)
   * @param {IO|any}       [config.terminal = null]         external terminal provided ?
   * @param {boolean}      [config.autoClear = false]       clear on finish ?
   * @param {boolean}      [config.autoStop = false]        stop on finish ?
   * @param {boolean}      [config.hideCursor = false]      hide the cursor ?
   * @param {boolean}      [config.lineWrap = false]        allow or disable setLineWrap ?
   * @param {string}       [config.sentence = DEFAULT_FORMAT] the bar sentence
   * @param {function}     [config.formatTime = null]       external time-sentence provided ?
   * @param {function}     [config.formatValue = null]      external value-sentence provided ?
   * @param {function}     [config.formatBar = null]        external bar-sentence provided ?
   * @param {boolean}      [config.syncUpdate = true]       allow synchronous updates ?
   * @param {boolean}      [config.noTTYOutput = false]     noTTY mode
   * @param {number}       [config.notTTYSchedule = 2000]   schedule - 2s
   * @param {boolean}      [config.forceRedraw = false]     force bar redraw even if progress did not change
   *
   * @param {object}       [config.eta]                     eta config
   * @param {boolean}      [config.eta.on = false]          switch to turn on eta
   * @param {number}       [config.eta.capacity = 10]       the number of results to average ETA over
   * @param {boolean}      [config.eta.autoUpdate = false]  automatic eta updates based on fps
   * @returns {Config}
   */
  constructor(config) {
    var _config$eta, _config$eta2;

    // merge layout
    // the max update rate in fps (redraw will only triggered on value change)
    this.throttle = 1000 / (config.fps ?? 10); // the output stream to write on

    this.output = config.output ?? process.stdout;
    this.input = config.input ?? process.stdin;
    this.eta = config.eta ? {
      capacity: ((_config$eta = config.eta) === null || _config$eta === void 0 ? void 0 : _config$eta.capacity) ?? 10,
      // the number of results to average ETA over
      autoUpdate: ((_config$eta2 = config.eta) === null || _config$eta2 === void 0 ? void 0 : _config$eta2.autoUpdate) ?? false // automatic eta updates based on fps

    } : null;
    this.terminal = config.terminal ?? null; // external terminal provided ?

    this.autoClear = config.autoClear ?? false; // clear on finish ?

    this.autoStop = config.autoStop ?? false; // stop on finish ?

    this.hideCursor = config.hideCursor ?? true; // hide the cursor ?

    this.lineWrap = config.lineWrap ?? false; // disable setLineWrap ?

    this.syncUpdate = config.syncUpdate ?? true; // allow synchronous updates ?

    this.noTTYOutput = config.noTTYOutput ?? false; // noTTY mode

    this.notTTYSchedule = config.notTTYSchedule ?? 2000; // schedule - 2s

    this.forceRedraw = config.forceRedraw ?? false; // force bar redraw even if progress did not change

    return this;
  }

  static build(config) {
    return new Config(config);
  }

}

// ETA: estimated time to completion
class ETA {
  constructor(capacity, initTime, initValue) {
    // size of eta buffer
    this.capacity = capacity || 100; // eta buffer with initial values

    this.valueSeries = [initValue];
    this.timeSeries = [initTime]; // eta time value

    this.estimate = '0';
  } // add new values to calculation buffer


  update({
    now,
    value,
    total
  }) {
    this.valueSeries.push(value);
    this.timeSeries.push(now ?? Date.now());
    this.calculate(total - value);
  } // eta calculation - request number of remaining events


  calculate(remaining) {
    const len = this.valueSeries.length,
          // get number of samples in eta buffer
    cap = this.capacity,
          hi = len - 1,
          lo = len > cap ? len - cap : 0; // consumed-Math.min(cap,len)

    const dValue = this.valueSeries[hi] - this.valueSeries[lo],
          dTime = this.timeSeries[hi] - this.timeSeries[lo],
          rate = dValue / dTime; // get progress per ms

    if (len > cap) {
      this.valueSeries = this.valueSeries.slice(-cap);
      this.timeSeries = this.timeSeries.slice(-cap);
    } // strip past elements


    const eta = Math.ceil(remaining / (rate * 1000));
    return this.estimate = isNaN(eta) ? 'NULL' : !isFinite(eta) ? 'INF' // +/- Infinity: NaN already handled
    : eta > 1e7 ? 'INF' // > 10M s: - set upper display limit ~115days (1e7/60/60/24)
    : eta < 0 ? 0 // negative: 0
    : eta; // assign
  }

}

class State {
  constructor(data) {
    this.value = data.value ?? 0;
    this.total = data.total ?? 100;
    this.start = data.start ?? Date.now(); // store start time for duration+eta calculation

    this.end = data.end ?? null; // reset stop time for 're-start' scenario (used for duration calculation)

    this.calETA = data.eta ? new ETA(data.eta.capacity ?? 64, this.start, this.value) : null; // initialize eta buffer

    return this;
  }

  static build(data) {
    return new State(data);
  }

  get eta() {
    var _this$calETA;

    return (_this$calETA = this.calETA) === null || _this$calETA === void 0 ? void 0 : _this$calETA.estimate;
  }

  get reachLimit() {
    return this.value >= this.total;
  }

  get elapsed() {
    return math.round(((this.end ?? Date.now()) - this.start) / 1000);
  }

  get percent() {
    return pad3('' + ~~(this.progress * 100));
  }

  get progress() {
    const progress = this.value / this.total;
    return isNaN(progress) ? 0 // this.preset?.autoZero ? 0.0 : 1.0
    : math.constraint(progress, 0, 1);
  }

  update(value) {
    var _this$calETA2;

    if (nullish.valid(value)) this.value = value;
    this.now = Date.now();
    (_this$calETA2 = this.calETA) === null || _this$calETA2 === void 0 ? void 0 : _this$calETA2.update(this); // add new value; recalculate eta

    if (this.reachLimit) this.end = this.now;
    return this;
  }

  stop(value) {
    if (nullish.valid(value)) this.value = value;
    this.end = Date.now();
    return this;
  }

}

class Escape {
  constructor(conf) {
    this.ctx = conf.ctx ?? {};
    this.arg = conf.arg ?? null;
    this.fn = conf.fn.bind(this.ctx, this.arg);
    this.instant = conf.instant ?? true;
    this.on = false;
  }

  static build(conf) {
    return new Escape(conf);
  }

  get active() {
    return this.on;
  }

  async loop(ms) {
    this.on = true;
    if (!this.fn) return void 0;
    if (this.instant) this.fn();

    for await (const _ of promises.setInterval(ms)) {
      if (!this.on) break;
      await this.fn();
    }
  }

  stop() {
    return this.on = false;
  }

}

class IO extends backend.IO {
  /** @type {boolean} line wrapping enabled */
  lineWrap = true;
  /** @type {number} current, relative y position */

  offset = 0;
  /**
   *
   * @param {Config|object} configs
   * @param {ReadStream} configs.input
   * @param {WriteStream} configs.output
   * @param {boolean} [configs.lineWrap]
   * @param {number} [configs.offset]
   *
   */

  constructor(configs) {
    super(configs);
    this.offset = configs.offset ?? 0;

    if (!this.isTTY) {
      console.error('>> [baro:IO] stream is not tty. baro:IO functions may not work.');
    }
  }

  static build(configs) {
    return new IO(configs);
  } // tty environment


  get isTTY() {
    return this.output.isTTY;
  }

  get excessive() {
    return this.offset > this.height;
  } // CSI n G	CHA	Cursor Horizontal Absolute	Moves the cursor to column n (default 1).
  // write output
  // clear to the right from cursor


  writeOff(text) {
    this.output.write(_escape.cursor.charTo(0) + text + _escape.clear.RIGHT_TO_CURSOR);
  }

  saveCursor() {
    this.output.write(_escape.cursor.SAVE);
  } // save cursor position + settings


  restoreCursor() {
    this.output.write(_escape.cursor.RESTORE);
  } // restore last cursor position + settings


  showCursor(enabled) {
    this.output.write(enabled ? _escape.cursor.SHOW : _escape.cursor.HIDE);
  } // show/hide cursor


  cursorTo(x, y) {
    this.output.write(_escape.cursor.goto(x, y));
  } // change cursor position: rl.cursorTo(this.output, x, y)
  // change relative cursor position


  moveCursor(dx, dy) {
    if (dy) this.offset += dy; // store current position

    if (dx || dy) rl__namespace.moveCursor(this.output, dx, dy); // move cursor relative
  }

  offsetLines(offset) {
    if (offset === 0) return;
    const cursorMovement = offset >= 0 ? _escape.cursor.down(offset) : _escape.cursor.up(-offset);
    this.output.write(cursorMovement + _escape.cursor.charTo(0)); // rl.moveCursor(this.output, -this.width, offset) // move cursor to initial line // rl.cursorTo(this.stream, 0, null) // first char
  } // reset relative cursor


  resetCursor() {
    this.offsetLines(-this.offset); // rl.moveCursor(this.output, -this.width, this.offset) // move cursor to initial line // rl.cursorTo(this.stream, 0, null) // first char

    this.offset = 0; // reset counter
  }

  clearRight() {
    rl__namespace.clearLine(this.output, 1);
  } // clear to the right from cursor


  clearLine() {
    rl__namespace.clearLine(this.output, 0);
  } // clear the full line


  clearDown() {
    rl__namespace.clearScreenDown(this.output);
  } // clear everything beyond the current line
  // add new line; increment counter


  nextLine() {
    this.output.write(enumControlChars.LF);
    this.offset++;
  } // create new page, equivalent to Ctrl+L clear screen


  nextPage() {
    this.output.write(_escape.clear.ENTIRE_SCREEN + _escape.cursor.goto(0, 0)); // this.offset = 0
  } // store state + control line wrapping


  setLineWrap(enabled) {
    this.output.write(enabled ? _escape.decset.WRAP_ON : _escape.decset.WRAP_OFF);
  }

}

class Baro {
  config;
  format;
  states = [];
  escape = Escape.build({
    fn: this.#renderStates,
    ctx: this,
    arg: this.states
  });
  #locker = null;
  /**
   *
   * @param {Config} config
   * @param {Layout} layout
   */

  constructor(config, layout) {
    this.config = config;
    this.layout = layout;
    this.io = IO.build(this.config);
  }

  static build(config, layout) {
    config = Config.build(config);
    layout = Layout.build(layout);
    return new Baro(config, layout);
  }

  get active() {
    return this.escape.active;
  }

  get forceRedraw() {
    return this.config.forceRedraw || this.config.noTTYOutput && !this.io.isTTY; // force redraw in noTTY-mode!
  }

  async start() {
    const {
      io
    } = this;
    io.input.resume();
    if (this.config.hideCursor) io.showCursor(false); // hide the cursor ?

    if (!this.config.lineWrap) io.setLineWrap(false); // disable line wrapping ?
    // this.io.output.write('\f')
    // const height = this.io.height
    // this.io.output.write(cursor.nextLine(height) + cursor.prevLine(height))
    // this.io.output.write(scroll.down(height))
    // const [ x, y ] = await io.asyncCursorPos()
    // console.log('x', x, 'y', y, 'offset', io.offset, 'states', this.states.length, 'height', io.height)
    // if (x + this.states.length >= io.height) {
    //   io.output.write('\f')
    //   // io.nextPage()
    // }
    // WARNING: intentionally call loop without await

    Promise.resolve().then(() => this.escape.loop(this.config.throttle)); // initialize update timer
  }
  /**
   * add a new bar to the stack
   * @param {State|object} state // const state = new State(total, value, this.config.eta)
   * @returns {State|object}
   */


  async append(state) {
    if (this.#locker) await this.#locker; // console.debug('>>', state.agent, 'waiting for occupy')

    const taskPromise = Promise.resolve().then(async () => {
      state.last = Number.NEGATIVE_INFINITY;
      this.states.push(state);
      if (!this.escape.active && this.states.length) await this.start();
    });
    this.#locker = taskPromise.then(() => this.#locker = null);
    return state;
  } // remove a bar from the stack


  remove(state) {
    const index = this.states.indexOf(state); // find element

    if (index < 0) return false; // element found ?

    this.states.splice(index, 1); // remove element

    this.io.nextLine();
    this.io.clearDown();
    return true;
  }

  async stop() {
    this.escape.stop(); // stop timer

    if (this.config.hideCursor) {
      this.io.showCursor(true);
    } // cursor hidden ?


    if (!this.config.lineWrap) {
      this.io.setLineWrap(true);
    } // re-enable line wrapping ?


    if (this.config.autoClear) {
      this.io.resetCursor(); // reset cursor

      this.io.clearDown();
    } // clear all bars or show final progress
    else {
      // for (let state of this.states) { state.stop() }
      await this.#renderStates(this.states);
    }

    this.io.input.pause();
  }

  async #renderStates(states) {
    const {
      io
    } = this;
    const height = io.height - 1; // const [ x, y ] = await io.asyncCursorPos()

    io.offsetLines(-Math.min(io.offset, height)); // reset cursor

    io.offset = 0;

    if (height) {
      for (const state of states.slice(-height)) {
        if (this.forceRedraw || state.value !== state.last) {
          // `CURSOR (${x}, ${y}) OFFSET (${io.offset}) TERM (${io.size}) ` +
          io.writeOff(this.layout.format(state));
          state.last = state.value;
        }

        io.nextLine();
      }
    }

    if (this.config.autoStop && states.every(state => state.reachLimit)) {
      await this.stop();
    } // stop if autoStop and all bars stopped

  }

}

class Spin {
  max;
  value;
  width;
  step;

  constructor(max, width, step) {
    this.max = max;
    this.width = width;
    this.step = step;
    this.value = 0;
  }

  static build(max, width, step) {
    return new Spin(max, width, step);
  }

  next() {
    this.value += this.step;
    if (this.value >= this.max) this.value -= this.max;
    return this;
  }

  get sequel() {
    let next = this.value + this.width;
    if (next > this.max) next -= this.max;
    return next;
  }

  get record() {
    const {
      value,
      sequel
    } = this;

    if (value <= 0 || value >= this.max) {
      const x = this.width;
      const y = this.max - this.width;
      return [0, 0, x, y];
    } else {
      if (value < sequel) {
        const x = value - 1;
        const y = this.width;
        const z = this.max - this.width - value + 1;
        return [0, x, y, z];
      } else {
        const x = sequel;
        const y = value - sequel - 1;
        const z = this.max - value + 1;
        return [x, y, z, 0];
      }
    }
  }

  renderBar([bar, spc]) {
    const {
      value,
      sequel
    } = this;

    if (value <= 0 || value >= this.max) {
      const x = this.width;
      const y = this.max - this.width;
      return bar.slice(0, x) + spc.slice(0, y);
    } else {
      if (value < sequel) {
        const x = value;
        const y = this.width;
        const z = this.max - this.width - value;
        return spc.slice(0, x) + bar.slice(0, y) + spc.slice(0, z);
      } else {
        const x = sequel;
        const y = value - sequel;
        const z = this.max - value;
        return bar.slice(0, x) + spc.slice(0, y) + bar.slice(0, z);
      }
    }
  }

}

const CHARSET_SHADE = [`█`, `░`]; // \u2588 \u2591

const CHARSET_RECT = [`■`, ` `]; // \u25A0

const CHARSET_LEGACY = [`=`, `-`];

exports.Baro = Baro;
exports.CHARSET_LEGACY = CHARSET_LEGACY;
exports.CHARSET_RECT = CHARSET_RECT;
exports.CHARSET_SHADE = CHARSET_SHADE;
exports.Config = Config;
exports.ETA = ETA;
exports.Escape = Escape;
exports.Layout = Layout;
exports.Spin = Spin;
exports.State = State;