(function($) {
  'use strict';

  let _defaults = {
    data: [],
    placeholder: '',
    secondaryPlaceholder: '',
    autocompleteOptions: {},
    limit: Infinity,
    onChipAdd: null,
    onChipSelect: null,
    onChipDelete: null
  };

  /**
   * @typedef {Object} chip
   * @property {String} tag  chip tag string
   * @property {String} [image]  chip avatar image string
   */

  /**
   * @class
   *
   */
  class Chips extends Component {
    /**
     * Construct Chips instance and set up overlay
     * @constructor
     * @param {Element} el
     * @param {Object} options
     */
    constructor(el, options) {
      super(Chips, el, options);

      this.el.M_Chips = this;

      /**
       * Options for the modal
       * @member Chips#options
       * @prop {Array} data
       * @prop {String} placeholder
       * @prop {String} secondaryPlaceholder
       * @prop {Object} autocompleteOptions
       */
      this.options = $.extend({}, Chips.defaults, options);

      this.$el.addClass('chips input-field');
      this.chipsData = [];
      this.$chips = $();
      this._setupInput();
      this.hasAutocomplete = Object.keys(this.options.autocompleteOptions).length > 0;

      // Set input id
      if (!this.$input.attr('id')) {
        this.$input.attr('id', M.guid());
      }

      // Render initial chips
      if (this.options.data.length) {
        this.chipsData = this.options.data;
        this._renderChips(this.chipsData);
      }

      // Setup autocomplete if needed
      if (this.hasAutocomplete) {
        this._setupAutocomplete();
      }

      this._setPlaceholder();
      this._setupLabel();
      this._setupEventHandlers();
    }

    static get defaults() {
      return _defaults;
    }

    static init(els, options) {
      return super.init(this, els, options);
    }

    /**
     * Get Instance
     */
    static getInstance(el) {
      let domElem = !!el.jquery ? el[0] : el;
      return domElem.M_Chips;
    }

    /**
     * Get Chips Data
     */
    getData() {
      return this.chipsData;
    }

    /**
     * Teardown component
     */
    destroy() {
      this._removeEventHandlers();
      this.$chips.remove();
      this.el.M_Chips = undefined;
    }

    /**
     * Setup Event Handlers
     */
    _setupEventHandlers() {
      this._handleChipClickBound = this._handleChipClick.bind(this);
      this._handleInputKeydownBound = this._handleInputKeydown.bind(this);
      this._handleInputFocusBound = this._handleInputFocus.bind(this);
      this._handleInputBlurBound = this._handleInputBlur.bind(this);

      this.el.addEventListener('click', this._handleChipClickBound);
      document.addEventListener('keydown', Chips._handleChipsKeydown);
      document.addEventListener('keyup', Chips._handleChipsKeyup);
      this.el.addEventListener('blur', Chips._handleChipsBlur, true);
      this.$input[0].addEventListener('focus', this._handleInputFocusBound);
      this.$input[0].addEventListener('blur', this._handleInputBlurBound);
      this.$input[0].addEventListener('keydown', this._handleInputKeydownBound);
    }

    /**
     * Remove Event Handlers
     */
    _removeEventHandlers() {
      this.el.removeEventListener('click', this._handleChipClickBound);
      document.removeEventListener('keydown', Chips._handleChipsKeydown);
      document.removeEventListener('keyup', Chips._handleChipsKeyup);
      this.el.removeEventListener('blur', Chips._handleChipsBlur, true);
      this.$input[0].removeEventListener('focus', this._handleInputFocusBound);
      this.$input[0].removeEventListener('blur', this._handleInputBlurBound);
      this.$input[0].removeEventListener('keydown', this._handleInputKeydownBound);
    }

    /**
     * Handle Chip Click
     * @param {Event} e
     */
    _handleChipClick(e) {
      let $chip = $(e.target).closest('.chip');
      let clickedClose = $(e.target).is('.close');
      if ($chip.length) {
        let index = $chip.index();
        if (clickedClose) {
          // delete chip
          this.deleteChip(index);
          this.$input[0].focus();
        } else {
          // select chip
          this.selectChip(index);
        }

        // Default handle click to focus on input
      } else {
        this.$input[0].focus();
      }
    }

    /**
     * Handle Chips Keydown
     * @param {Event} e
     */
    static _handleChipsKeydown(e) {
      Chips._keydown = true;

      let $chips = $(e.target).closest('.chips');
      let chipsKeydown = e.target && $chips.length;

      // Don't handle keydown inputs on input and textarea
      if ($(e.target).is('input, textarea') || !chipsKeydown) {
        return;
      }

      let currChips = $chips[0].M_Chips;

      // backspace and delete
      if (e.keyCode === 8 || e.keyCode === 46) {
        e.preventDefault();

        let selectIndex = currChips.chipsData.length;
        if (currChips._selectedChip) {
          let index = currChips._selectedChip.index();
          currChips.deleteChip(index);
          currChips._selectedChip = null;

          // Make sure selectIndex doesn't go negative
          selectIndex = Math.max(index - 1, 0);
        }

        if (currChips.chipsData.length) {
          currChips.selectChip(selectIndex);
        }

        // left arrow key
      } else if (e.keyCode === 37) {
        if (currChips._selectedChip) {
          let selectIndex = currChips._selectedChip.index() - 1;
          if (selectIndex < 0) {
            return;
          }
          currChips.selectChip(selectIndex);
        }

        // right arrow key
      } else if (e.keyCode === 39) {
        if (currChips._selectedChip) {
          let selectIndex = currChips._selectedChip.index() + 1;

          if (selectIndex >= currChips.chipsData.length) {
            currChips.$input[0].focus();
          } else {
            currChips.selectChip(selectIndex);
          }
        }
      }
    }

    /**
     * Handle Chips Keyup
     * @param {Event} e
     */
    static _handleChipsKeyup(e) {
      Chips._keydown = false;
    }

    /**
     * Handle Chips Blur
     * @param {Event} e
     */
    static _handleChipsBlur(e) {
      if (!Chips._keydown) {
        let $chips = $(e.target).closest('.chips');
        let currChips = $chips[0].M_Chips;

        currChips._selectedChip = null;
      }
    }

    /**
     * Handle Input Focus
     */
    _handleInputFocus() {
      this.$el.addClass('focus');
    }

    /**
     * Handle Input Blur
     */
    _handleInputBlur() {
      this.$el.removeClass('focus');
    }

    /**
     * Handle Input Keydown
     * @param {Event} e
     */
    _handleInputKeydown(e) {
      Chips._keydown = true;

      // enter
      if (e.keyCode === 13) {
        // Override enter if autocompleting.
        if (this.hasAutocomplete && this.autocomplete && this.autocomplete.isOpen) {
          return;
        }

        e.preventDefault();
        this.addChip({
          tag: this.$input[0].value
        });
        this.$input[0].value = '';

        // delete or left
      } else if (
        (e.keyCode === 8 || e.keyCode === 37) &&
        this.$input[0].value === '' &&
        this.chipsData.length
      ) {
        e.preventDefault();
        this.selectChip(this.chipsData.length - 1);
      }
    }

    /**
     * Render Chip
     * @param {chip} chip
     * @return {Element}
     */
    _renderChip(chip) {
      if (!chip.tag) {
        return;
      }

      let renderedChip = document.createElement('div');
      let closeIcon = document.createElement('i');
      renderedChip.classList.add('chip');
      renderedChip.textContent = chip.tag;
      renderedChip.setAttribute('tabindex', 0);
      $(closeIcon).addClass('material-icons close');
      closeIcon.textContent = 'close';

      // attach image if needed
      if (chip.image) {
        let img = document.createElement('img');
        img.setAttribute('src', chip.image);
        renderedChip.insertBefore(img, renderedChip.firstChild);
      }

      renderedChip.appendChild(closeIcon);
      return renderedChip;
    }

    /**
     * Render Chips
     */
    _renderChips() {
      this.$chips.remove();
      for (let i = 0; i < this.chipsData.length; i++) {
        let chipEl = this._renderChip(this.chipsData[i]);
        this.$el.append(chipEl);
        this.$chips.add(chipEl);
      }

      // move input to end
      this.$el.append(this.$input[0]);
    }

    /**
     * Setup Autocomplete
     */
    _setupAutocomplete() {
      this.options.autocompleteOptions.onAutocomplete = (val) => {
        this.addChip({
          tag: val
        });
        this.$input[0].value = '';
        this.$input[0].focus();
      };

      this.autocomplete = M.Autocomplete.init(this.$input[0], this.options.autocompleteOptions);
    }

    /**
     * Setup Input
     */
    _setupInput() {
      this.$input = this.$el.find('input');
      if (!this.$input.length) {
        this.$input = $('<input></input>');
        this.$el.append(this.$input);
      }

      this.$input.addClass('input');
    }

    /**
     * Setup Label
     */
    _setupLabel() {
      this.$label = this.$el.find('label');
      if (this.$label.length) {
        this.$label.setAttribute('for', this.$input.attr('id'));
      }
    }

    /**
     * Set placeholder
     */
    _setPlaceholder() {
      if (this.chipsData !== undefined && !this.chipsData.length && this.options.placeholder) {
        $(this.$input).prop('placeholder', this.options.placeholder);
      } else if (
        (this.chipsData === undefined || !!this.chipsData.length) &&
        this.options.secondaryPlaceholder
      ) {
        $(this.$input).prop('placeholder', this.options.secondaryPlaceholder);
      }
    }

    /**
     * Check if chip is valid
     * @param {chip} chip
     */
    _isValid(chip) {
      if (chip.hasOwnProperty('tag') && chip.tag !== '') {
        let exists = false;
        for (let i = 0; i < this.chipsData.length; i++) {
          if (this.chipsData[i].tag === chip.tag) {
            exists = true;
            break;
          }
        }
        return !exists;
      }

      return false;
    }

    /**
     * Add chip
     * @param {chip} chip
     */
    addChip(chip) {
      if (!this._isValid(chip) || this.chipsData.length >= this.options.limit) {
        return;
      }

      let renderedChip = this._renderChip(chip);
      this.$chips.add(renderedChip);
      this.chipsData.push(chip);
      $(this.$input).before(renderedChip);
      this._setPlaceholder();

      // fire chipAdd callback
      if (typeof this.options.onChipAdd === 'function') {
        this.options.onChipAdd.call(this, this.$el, renderedChip);
      }
    }

    /**
     * Delete chip
     * @param {Number} chip
     */
    deleteChip(chipIndex) {
      let $chip = this.$chips.eq(chipIndex);
      this.$chips.eq(chipIndex).remove();
      this.$chips = this.$chips.filter(function(el) {
        return $(el).index() >= 0;
      });
      this.chipsData.splice(chipIndex, 1);
      this._setPlaceholder();

      // fire chipDelete callback
      if (typeof this.options.onChipDelete === 'function') {
        this.options.onChipDelete.call(this, this.$el, $chip[0]);
      }
    }

    /**
     * Select chip
     * @param {Number} chip
     */
    selectChip(chipIndex) {
      let $chip = this.$chips.eq(chipIndex);
      this._selectedChip = $chip;
      $chip[0].focus();

      // fire chipSelect callback
      if (typeof this.options.onChipSelect === 'function') {
        this.options.onChipSelect.call(this, this.$el, $chip[0]);
      }
    }
  }

  /**
   * @static
   * @memberof Chips
   */
  Chips._keydown = false;

  M.Chips = Chips;

  if (M.jQueryLoaded) {
    M.initializeJqueryWrapper(Chips, 'chips', 'M_Chips');
  }

  $(document).ready(function() {
    // Handle removal of static chips.
    $(document.body).on('click', '.chip .close', function() {
      let $chips = $(this).closest('.chips');
      if ($chips.length && $chips[0].M_Chips) {
        return;
      }
      $(this)
        .closest('.chip')
        .remove();
    });
  });
})(cash);