import Component from '@ember/component';
import { inject as service } from '@ember/service';
import { singleton } from 'pipeline/utils/pipelineStep';
import { set, get } from '@ember/object';

export default Component.extend({
  hintAry: null,
  matchedArry: null,
  positionX: 0,
  positionY: 0,
  activeIndex: 0,
  codeMirror: service(),

  positionStyle: function() {
    var positionX = get(this, 'positionX'), positionY=get(this, 'positionY');
    return [
      'position: fixed',
      `top: ${positionY}px`, 
      `left: ${positionX}px`,
      `z-index: 9999`
    ].join(';')
  }.property('positionX','positionY'),

  startStr: '$',
  triggerInputEle: null,
  hidden: true,
  triggerClickHint: null,
  matchedIndex: -1,
  cursorPosition: -1,
  originalScrollTop : null,

  hiddenClass:function() {
    var hd = get(this, 'hidden');
    return hd?'hide':'';
  }.property('hidden'),

  showHint(y,x) {
    set(this, 'positionX',x);
    set(this, 'positionY',y);
    set(this, 'hidden',false);
  },

  setTriggerInputEle(ele) {
    set(this, 'triggerInputEle',ele)
  },

  getCursorCoordinates(value) {
    var lines = value.split(/[\n\r]/g);
    var maxI = lines.length - 1;
    return {
      x: (lines[maxI].length-1)*8,
      y: (maxI+1)*24+8
    };
  },

  startHint(ele,cb) {
    set(this, 'triggerInputEle',ele);
    var el = get(this, 'triggerInputEle');
    if ( !el ) {
      this.setTriggerInputEle(null);
      set(this, 'triggerClickHint',null);
      set(this, 'hidden',true);
      return false;
    }

    var $el = this.$(el);
    var value = $el.val();
    var cursorPosition = $el.getCursorPosition();
    set(this, 'cursorPosition',cursorPosition);
    var cursorValue = value.slice(0, cursorPosition);
    var matched = false;
    var hintAry = get(this, 'hintAry');
    var _$value = cursorValue.lastIndexOf('$');
    set(this, 'matchedIndex', _$value);
    _$value = cursorValue.slice(_$value,cursorValue.length);
    var matchedArry = [];

    if ( _$value ) {
      for (var i = 0; i < hintAry.length; i++) {
        var item = hintAry[i];
        //if matched on end
        if ( item.indexOf(_$value) === 0 ) {
          matched = true;
          matchedArry.push(item);
        }
      }

      if ( matched ) {
        var offset = $el.offset();
        set(this, 'matchedArry',matchedArry);
        var cursorCoordinates = this.getCursorCoordinates(cursorValue);
        var oT = this.$(window).scrollTop();
        var originalCoordinates = {
          top: offset.top+cursorCoordinates.y,
          left: offset.left+cursorCoordinates.x
        };
        set(this, 'originalCoordinates',originalCoordinates);
        this.showHint(originalCoordinates.top-oT,originalCoordinates.left);
        set(this, 'triggerClickHint',cb);
        return true;
      }
    }

    this.setTriggerInputEle(null);
    set(this, 'triggerClickHint',null);
    set(this, 'hidden',true);
    return false;
  },

  actions: {
    clickHint(val) {
      var triggerClickHint = get(this, 'triggerClickHint');

      if ( triggerClickHint ) {
        triggerClickHint(val);
      }

      var triggerInputEle = get(this, 'triggerInputEle');
      if ( !triggerInputEle ) {
        return;
      }

      var matchedIndex = get(this, 'matchedIndex');
      var cursorPosition = get(this, 'cursorPosition');
      var value = $(triggerInputEle).val();
      if ( matchedIndex !==-1 && triggerInputEle ) {
        var newVal = value.slice(0,matchedIndex).concat(val).concat(value.slice(cursorPosition,value.length));
        $(triggerInputEle).val(newVal);
        $(triggerInputEle).trigger('change',newVal);
        $(triggerInputEle).trigger('input',newVal);
      }
    },
  },

  didRender() {
    // extend Jquery
    if ( window.jQuery||window.$ ) {
      jQuery.fn.E_INPUT_HINT = this;

      jQuery.fn.getCursorPosition = function() {
        var el = $(this).get(0);
        var pos = 0;

        if ( 'selectionStart' in el ) {
            pos = el.selectionStart;
        } else if ( 'selection' in document ) {
            el.focus();
            var Sel = document.selection.createRange();
            var SelLength = document.selection.createRange().text.length;
            Sel.moveStart('character', -el.value.length);
            pos = Sel.text.length - SelLength;
        }

        return pos;
      }
    }

    var clickHiden = () => {
      set(this, 'hidden',true);
    };

    var scrollPosition = () => {
      var hd = get(this, 'hidden');
      if ( hd ) {
        return;
      }

      var originalCoordinates = get(this, 'originalCoordinates');
      this.showHint(originalCoordinates.top-this.$(window).scrollTop(),originalCoordinates.left);
    };

    this.$(document).on('click.hint', clickHiden).on('scroll.hint', scrollPosition);
  },

  willDestroyElement() {
    this._super();
    this.$(document).off('click.hint');
    this.$(document).off('scroll.hint');
    this.$(document).off('keyup.hint');
    this.$(document).off('keyup.hint-return');
  },

  didInsertElement() {
    this._super(...arguments);
    singleton.hintAry = get(this, 'hintAry');
    this.$(document).on('keyup.hint', 'input:not(.js-disable-hint)', (e) => {
      $.fn.E_INPUT_HINT.startHint(e.target, ( /*hint*/ ) => {});
    });
  },
});