import ol_ext_element from '../element.js';
import ol_ext_input_Base from './Base.js'

/** Checkbox input
 * @constructor
 * @extends {ol_ext_input_Base}
 * @fires change:value
 * @param {*} options
 *  @param {string} [options.className]
 *  @param {Element} [options.input] input element, if non create one (use parent to tell where)
 *  @param {Element} [options.input2] input element
 *  @param {Element} [options.parent] element to use as parent if no input option
 *  @param {number} [options.min] min value, default use input min
 *  @param {number} [options.max] max value, default use input max
 *  @param {number} [options.step] step value, default use input step
 *  @param {boolean} [options.overflow=false] enable values over min/max
 */
var ol_ext_input_Range = class olextinputRange extends ol_ext_input_Base {
  constructor(options) {
    options = options || {};
    super(options);

    this.set('overflow', !!options.overflow);

    this.element = ol_ext_element.create('DIV', {
      className: 'ol-input-slider ol-input-range'
        + (options.className ? ' ' + options.className : '')
    });

    var input = this.input;
    if (input.parentNode)
      input.parentNode.insertBefore(this.element, input);
    this.element.appendChild(input);

    // Slider
    var slider = this.slider = ol_ext_element.create('DIV', {
      className: 'ol-slider',
      parent: this.element
    });
    var back = ol_ext_element.create('DIV', {
      className: 'ol-back',
      parent: this.slider
    });

    var input2 = this.input2 = options.input2;
    if (input2)
      this.element.appendChild(input2);

    // Cursors
    var cursor = ol_ext_element.create('DIV', {
      className: 'ol-cursor',
      parent: slider
    });
    var cursor2 = ol_ext_element.create('DIV', {
      className: 'ol-cursor',
      parent: input2 ? slider : undefined
    });

    var currentCursor = cursor;
    function setCursor(e) {
      currentCursor = e.target;
    }
    cursor.addEventListener('mousedown', setCursor, false);
    cursor.addEventListener('touchstart', setCursor, false);
    cursor2.addEventListener('mousedown', setCursor, false);
    cursor2.addEventListener('touchstart', setCursor, false);

    var min = (options.min !== undefined) ? options.min : parseFloat(input.min) || 0;
    var max = (options.max !== undefined) ? options.max : parseFloat(input.max) || 1;
    var step = (options.step !== undefined) ? options.step : parseFloat(input.step) || 1;
    var dstep = 1 / step;

    function setRange() {
      // range
      if (input2) {
        var l1 = parseFloat(cursor.style.left) || 0;
        var l2 = parseFloat(cursor2.style.left) || 0;
        back.style.left = Math.min(l1, l2) + '%';
        back.style.right = (100 - Math.max(l1, l2)) + '%';
      } else {
        back.style.left = 0;
        back.style.right = (100 - parseFloat(cursor.style.left) || 0) + '%';
      }
    }
    function checkMinMax() {
      if (input2 && parseFloat(input.value) > parseFloat(input2.value)) {
        var v = input.value;
        input.value = input2.value;
        input2.value = v;
        setValue({ target: input });
        if (input2)
          setValue({ target: input2 });
      }
    }
    // Handle popup drag
    this._listenDrag(slider, function (e) {
      var current = (currentCursor === cursor ? input : input2);
      var tx = Math.max(0, Math.min(e.offsetX / slider.clientWidth, 1));
      currentCursor.style.left = Math.max(0, Math.min(100, Math.round(tx * 100))) + '%';
      var v = current.value = Math.round((tx * (max - min) + min) * dstep) / dstep;
      setRange();
      this.dispatchEvent({ type: 'change:value', value: v });
      if (e.type === 'pointerup') {
        checkMinMax();
      }
    }.bind(this));

    // Set value
    var setValue = function (e) {
      var current = e.target;
      var curs = (current === input ? cursor : cursor2);
      var v = parseFloat(current.value) || 0;
      if (!this.get('overflow'))
        v = Math.max(min, Math.min(max, v));
      if (v != current.value)
        current.value = v;
      var tx = (v - min) / (max - min);
      curs.style.left = Math.max(0, Math.min(100, Math.round(tx * 100))) + '%';
      setRange();
      this.dispatchEvent({ type: 'change:value', value: v });
      checkMinMax();
    }.bind(this);

    input.addEventListener('change', setValue);
    if (input2)
      input2.addEventListener('change', setValue);

    setValue({ target: input });
    if (input2)
      setValue({ target: input2 });
  }
  /** Set the current value (second input)
   */
  setValue2(v) {
    if (!this.input2)
      return;
    if (v !== undefined)
      this.input2.value = v;
    this.input2.dispatchEvent(new Event('change'));
  }
  /** Get the current value (second input)
   */
  getValue2() {
    return this.input2 ? this.input2.value : null;
  }
  /** Get the current min value
   * @return {number}
   */
  getMin() {
    return Math.min(parseFloat(this.getValue()), parseFloat(this.getValue2()));
  }
  /** Get the current max value
   * @return {number}
   */
  getMax() {
    return Math.max(parseFloat(this.getValue()), parseFloat(this.getValue2()));
  }
}

export default ol_ext_input_Range