/**
 * SpinButton control.
 *
 * Adds bells and whistles to any ordinary textbox to
 * make it look and feel like a SpinButton Control.
 *
 * Supplies {@link external:jQuery.fn.SpinButton} (and also {@link external:jQuery.loadingStylesheets}).
 *
 * Originally written by George Adamson, Software Unity (george.jquery@softwareunity.com) August 2006:
 * - Added min/max options.
 * - Added step size option.
 * - Added bigStep (page up/down) option.
 *
 * Modifications made by Mark Gibson, (mgibson@designlinks.net) September 2006:
 * - Converted to jQuery plugin.
 * - Allow limited or unlimited min/max values.
 * - Allow custom class names, and add class to input element.
 * - Removed global vars.
 * - Reset (to original or through config) when invalid value entered.
 * - Repeat whilst holding mouse button down (with initial pause, like keyboard repeat).
 * - Support mouse wheel in Firefox.
 * - Fix double click in IE.
 * - Refactored some code and renamed some vars.
 *
 * Modifications by Jeff Schiller, June 2009:
 * - provide callback function for when the value changes based on the following
 *   {@link https://www.mail-archive.com/jquery-en@googlegroups.com/msg36070.html}.
 *
 * Modifications by Jeff Schiller, July 2009:
 * - improve styling for widget in Opera.
 * - consistent key-repeat handling cross-browser.
 *
 * Modifications by Alexis Deveria, October 2009:
 * - provide "stepfunc" callback option to allow custom function to run when changing a value.
 * - Made adjustValue(0) only run on certain keyup events, not all.
 *
 * Tested in IE6, Opera9, Firefox 1.5.
 *
 * | Version | Date | Author | Notes |
 * |---------|------|--------|-------|
 * | v1.0 | 11 Aug 2006 | George Adamson | First release |
 * | v1.1 | Aug 2006 | George Adamson | Minor enhancements |
 * | v1.2 | 27 Sep 2006 | Mark Gibson | Major enhancements |
 * | v1.3a | 28 Sep 2006 | George Adamson | Minor enhancements |
 * | v1.4 | 18 Jun 2009 | Jeff Schiller | Added callback function |
 * | v1.5 | 06 Jul 2009 | Jeff Schiller | Fixes for Opera. |
 * | v1.6 | 13 Oct 2009 | Alexis Deveria | Added stepfunc function |
 * | v1.7 | 21 Oct 2009 | Alexis Deveria | Minor fixes.<br />Fast-repeat for keys and live updating as you type. |
 * | v1.8 | 12 Jan 2010 | Benjamin Thomas | Fixes for mouseout behavior.<br />Added smallStep |
 * | v1.9 | 20 May 2018 | Brett Zamir | Avoid SVGEdit dependency via `stateObj` config;<br />convert to ES6 module |
 * .
 *
 * @module jQuerySpinButton
 * @example
  // Create group of settings to initialise spinbutton(s). (Optional)
  const myOptions = {
    min: 0, // Set lower limit.
    max: 100, // Set upper limit.
    step: 1, // Set increment size.
    smallStep: 0.5, // Set shift-click increment size.
    stateObj: {tool_scale: 1}, // Object to allow passing in live-updating scale
    spinClass: mySpinBtnClass, // CSS class to style the spinbutton. (Class also specifies url of the up/down button image.)
    upClass: mySpinUpClass, // CSS class for style when mouse over up button.
    downClass: mySpinDnClass // CSS class for style when mouse over down button.
  };

  $(function () {
    // Initialise INPUT element(s) as SpinButtons: (passing options if desired)
    $('#myInputElement').SpinButton(myOptions);
  });
 */
/**
 * @function module:jQuerySpinButton.jQuerySpinButton
 * @param {external:jQuery} $ The jQuery object to which to add the plug-in
 * @returns {external:jQuery}
*/
export default function jQueryPluginSpinButton ($) {
  if (!$.loadingStylesheets) {
    $.loadingStylesheets = [];
  }
  const stylesheet = 'spinbtn/jQuery.SpinButton.css';
  if (!$.loadingStylesheets.includes(stylesheet)) {
    $.loadingStylesheets.push(stylesheet);
  }
  /**
  * @callback module:jQuerySpinButton.StepCallback
  * @param {external:jQuery} thisArg Value of `this`
  * @param {Float} i Value to adjust
  * @returns {Float}
  */
  /**
  * @callback module:jQuerySpinButton.ValueCallback
  * @param {external:jQuery.fn.SpinButton} thisArg Spin Button; check its `value` to see how it was changed.
  * @returns {void}
  */
  /**
   * @typedef {PlainObject} module:jQuerySpinButton.SpinButtonConfig
   * @property {Float} min Set lower limit
   * @property {Float} max Set upper limit.
   * @property {Float} step Set increment size.
   * @property {module:jQuerySpinButton.StepCallback} stepfunc Custom function to run when changing a value; called with `this` of object and the value to adjust and returns a float.
   * @property {module:jQuerySpinButton.ValueCallback} callback Called after value adjusted (with `this` of object)
   * @property {Float} smallStep Set shift-click increment size.
   * @property {PlainObject} stateObj Object to allow passing in live-updating scale
   * @property {Float} stateObj.tool_scale
   * @property {string} spinClass CSS class to style the spinbutton. (Class also specifies url of the up/down button image.)
   * @property {string} upClass CSS class for style when mouse over up button.
   * @property {string} downClass CSS class for style when mouse over down button.
   * @property {Float} page Value to be adjusted on page up/page down
   * @property {Float} reset Reset value when invalid value entered
   * @property {Float} delay Millisecond delay
   * @property {Float} interval Millisecond interval
  */
  /**
  * @function external:jQuery.fn.SpinButton
  * @param {module:jQuerySpinButton.SpinButtonConfig} cfg
  * @returns {external:jQuery}
  */
  $.fn.SpinButton = function (cfg) {
    cfg = cfg || {};

    /**
     *
     * @param {Element} el
     * @param {"offsetLeft"|"offsetTop"} prop
     * @returns {Integer}
     */
    function coord (el, prop) {
      const b = document.body;

      let c = el[prop];
      while ((el = el.offsetParent) && (el !== b)) {
        if (!$.browser.msie || (el.currentStyle.position !== 'relative')) {
          c += el[prop];
        }
      }

      return c;
    }

    return this.each(function () {
      this.repeating = false;

      // Apply specified options or defaults:
      // (Ought to refactor this some day to use $.extend() instead)
      this.spinCfg = {
        // min: cfg.min ? Number(cfg.min) : null,
        // max: cfg.max ? Number(cfg.max) : null,
        min: !isNaN(parseFloat(cfg.min)) ? Number(cfg.min) : null, // Fixes bug with min:0
        max: !isNaN(parseFloat(cfg.max)) ? Number(cfg.max) : null,
        step: cfg.step ? Number(cfg.step) : 1,
        stepfunc: cfg.stepfunc || false,
        page: cfg.page ? Number(cfg.page) : 10,
        upClass: cfg.upClass || 'up',
        downClass: cfg.downClass || 'down',
        reset: cfg.reset || this.value,
        delay: cfg.delay ? Number(cfg.delay) : 500,
        interval: cfg.interval ? Number(cfg.interval) : 100,
        _btn_width: 20,
        _direction: null,
        _delay: null,
        _repeat: null,
        callback: cfg.callback || null
      };

      // if a smallStep isn't supplied, use half the regular step
      this.spinCfg.smallStep = cfg.smallStep || this.spinCfg.step / 2;

      this.adjustValue = function (i) {
        let v;
        if (isNaN(this.value)) {
          v = this.spinCfg.reset;
        } else if (typeof this.spinCfg.stepfunc === 'function') {
          v = this.spinCfg.stepfunc(this, i);
        } else {
          // weirdest JavaScript bug ever: 5.1 + 0.1 = 5.199999999
          v = Number((Number(this.value) + Number(i)).toFixed(5));
        }
        if (this.spinCfg.min !== null) { v = Math.max(v, this.spinCfg.min); }
        if (this.spinCfg.max !== null) { v = Math.min(v, this.spinCfg.max); }
        this.value = v;
        if (typeof this.spinCfg.callback === 'function') {
          this.spinCfg.callback(this);
        }
      };

      $(this)
        .addClass(cfg.spinClass || 'spin-button')

        .mousemove(function (e) {
          // Determine which button mouse is over, or not (spin direction):
          const x = e.pageX || e.x;
          const y = e.pageY || e.y;
          const el = e.target;
          const scale = cfg.stateObj.tool_scale || 1;
          const height = $(el).height() / 2;

          const direction =
            (x > coord(el, 'offsetLeft') +
              el.offsetWidth * scale - this.spinCfg._btn_width)
              ? ((y < coord(el, 'offsetTop') + height * scale) ? 1 : -1)
              : 0;

          if (direction !== this.spinCfg._direction) {
            // Style up/down buttons:
            switch (direction) {
            case 1: // Up arrow:
              $(this).removeClass(this.spinCfg.downClass).addClass(this.spinCfg.upClass);
              break;
            case -1: // Down arrow:
              $(this).removeClass(this.spinCfg.upClass).addClass(this.spinCfg.downClass);
              break;
            default: // Mouse is elsewhere in the textbox
              $(this).removeClass(this.spinCfg.upClass).removeClass(this.spinCfg.downClass);
            }

            // Set spin direction:
            this.spinCfg._direction = direction;
          }
        })

        .mouseout(function () {
          // Reset up/down buttons to their normal appearance when mouse moves away:
          $(this).removeClass(this.spinCfg.upClass).removeClass(this.spinCfg.downClass);
          this.spinCfg._direction = null;
          window.clearInterval(this.spinCfg._repeat);
          window.clearTimeout(this.spinCfg._delay);
        })

        .mousedown(function (e) {
          if (e.button === 0 && this.spinCfg._direction !== 0) {
            // Respond to click on one of the buttons:
            const stepSize = e.shiftKey ? this.spinCfg.smallStep : this.spinCfg.step;

            const adjust = () => {
              this.adjustValue(this.spinCfg._direction * stepSize);
            };

            adjust();

            // Initial delay before repeating adjustment
            this.spinCfg._delay = window.setTimeout(() => {
              adjust();
              // Repeat adjust at regular intervals
              this.spinCfg._repeat = window.setInterval(adjust, this.spinCfg.interval);
            }, this.spinCfg.delay);
          }
        })

        .mouseup(function (e) {
          // Cancel repeating adjustment
          window.clearInterval(this.spinCfg._repeat);
          window.clearTimeout(this.spinCfg._delay);
        })

        .dblclick(function (e) {
          if ($.browser.msie) {
            this.adjustValue(this.spinCfg._direction * this.spinCfg.step);
          }
        })

        .keydown(function (e) {
          // Respond to up/down arrow keys.
          switch (e.keyCode) {
          case 38: this.adjustValue(this.spinCfg.step); break; // Up
          case 40: this.adjustValue(-this.spinCfg.step); break; // Down
          case 33: this.adjustValue(this.spinCfg.page); break; // PageUp
          case 34: this.adjustValue(-this.spinCfg.page); break; // PageDown
          }
        })

        /*
        http://unixpapa.com/js/key.html describes the current state-of-affairs for
        key repeat events:
        - Safari 3.1 changed their model so that keydown is reliably repeated going forward
        - Firefox and Opera still only repeat the keypress event, not the keydown
        */
        .keypress(function (e) {
          if (this.repeating) {
            // Respond to up/down arrow keys.
            switch (e.keyCode) {
            case 38: this.adjustValue(this.spinCfg.step); break; // Up
            case 40: this.adjustValue(-this.spinCfg.step); break; // Down
            case 33: this.adjustValue(this.spinCfg.page); break; // PageUp
            case 34: this.adjustValue(-this.spinCfg.page); break; // PageDown
            }
          // we always ignore the first keypress event (use the keydown instead)
          } else {
            this.repeating = true;
          }
        })

        // clear the 'repeating' flag
        .keyup(function (e) {
          this.repeating = false;
          switch (e.keyCode) {
          case 38: // Up
          case 40: // Down
          case 33: // PageUp
          case 34: // PageDown
          case 13: this.adjustValue(0); break; // Enter/Return
          }
        })

        .bind('mousewheel', function (e) {
          // Respond to mouse wheel in IE. (It returns up/dn motion in multiples of 120)
          if (e.wheelDelta >= 120) {
            this.adjustValue(this.spinCfg.step);
          } else if (e.wheelDelta <= -120) {
            this.adjustValue(-this.spinCfg.step);
          }

          e.preventDefault();
        })

        .change(function (e) {
          this.adjustValue(0);
        });

      if (this.addEventListener) {
        // Respond to mouse wheel in Firefox
        this.addEventListener('DOMMouseScroll', function (e) {
          if (e.detail > 0) {
            this.adjustValue(-this.spinCfg.step);
          } else if (e.detail < 0) {
            this.adjustValue(this.spinCfg.step);
          }

          e.preventDefault();
        });
      }
    });
  };
  return $;
}