import {KEY_CODES} from './../helpers/unicode';
import {stopImmediatePropagation, isImmediatePropagationStopped} from './../helpers/dom/event';
import {
  addClass,
  getScrollLeft,
  getScrollTop,
  hasClass,
  isChildOf,
  offset,
  outerHeight,
  outerWidth,
  removeClass,
  setCaretPosition,
} from './../helpers/dom/element';
import BaseEditor from './_baseEditor';
import EventManager from './../eventManager';

const MobileTextEditor = BaseEditor.prototype.extend();
const domDimensionsCache = {};

/**
 * @private
 * @editor MobileTextEditor
 * @class MobileTextEditor
 */
var createControls = function() {
  this.controls = {};

  this.controls.leftButton = document.createElement('DIV');
  this.controls.leftButton.className = 'leftButton';
  this.controls.rightButton = document.createElement('DIV');
  this.controls.rightButton.className = 'rightButton';
  this.controls.upButton = document.createElement('DIV');
  this.controls.upButton.className = 'upButton';
  this.controls.downButton = document.createElement('DIV');
  this.controls.downButton.className = 'downButton';

  for (var button in this.controls) {
    if (Object.prototype.hasOwnProperty.call(this.controls, button)) {
      this.positionControls.appendChild(this.controls[button]);
    }
  }
};

MobileTextEditor.prototype.valueChanged = function() {
  return this.initValue != this.getValue();
};

MobileTextEditor.prototype.init = function() {
  var that = this;
  this.eventManager = new EventManager(this.instance);

  this.createElements();
  this.bindEvents();

  this.instance.addHook('afterDestroy', () => {
    that.destroy();
  });

};

MobileTextEditor.prototype.getValue = function() {
  return this.TEXTAREA.value;
};

MobileTextEditor.prototype.setValue = function(newValue) {
  this.initValue = newValue;

  this.TEXTAREA.value = newValue;
};

MobileTextEditor.prototype.createElements = function() {
  this.editorContainer = document.createElement('DIV');
  this.editorContainer.className = 'htMobileEditorContainer';

  this.cellPointer = document.createElement('DIV');
  this.cellPointer.className = 'cellPointer';

  this.moveHandle = document.createElement('DIV');
  this.moveHandle.className = 'moveHandle';

  this.inputPane = document.createElement('DIV');
  this.inputPane.className = 'inputs';

  this.positionControls = document.createElement('DIV');
  this.positionControls.className = 'positionControls';

  this.TEXTAREA = document.createElement('TEXTAREA');
  addClass(this.TEXTAREA, 'handsontableInput');

  this.inputPane.appendChild(this.TEXTAREA);

  this.editorContainer.appendChild(this.cellPointer);
  this.editorContainer.appendChild(this.moveHandle);
  this.editorContainer.appendChild(this.inputPane);
  this.editorContainer.appendChild(this.positionControls);

  createControls.call(this);

  document.body.appendChild(this.editorContainer);
};

MobileTextEditor.prototype.onBeforeKeyDown = function(event) {
  var instance = this;
  var that = instance.getActiveEditor();

  if (event.target !== that.TEXTAREA || isImmediatePropagationStopped(event)) {
    return;
  }

  switch (event.keyCode) {
    case KEY_CODES.ENTER:
      that.close();
      event.preventDefault(); // don't add newline to field
      break;
    case KEY_CODES.BACKSPACE:
      stopImmediatePropagation(event); // backspace, delete, home, end should only work locally when cell is edited (not in table context)
      break;
    default:
      break;
  }
};

MobileTextEditor.prototype.open = function() {
  this.instance.addHook('beforeKeyDown', this.onBeforeKeyDown);

  addClass(this.editorContainer, 'active');
  removeClass(this.cellPointer, 'hidden');

  this.updateEditorPosition();
};

MobileTextEditor.prototype.focus = function() {
  this.TEXTAREA.focus();
  setCaretPosition(this.TEXTAREA, this.TEXTAREA.value.length);
};

MobileTextEditor.prototype.close = function() {
  this.TEXTAREA.blur();
  this.instance.removeHook('beforeKeyDown', this.onBeforeKeyDown);

  removeClass(this.editorContainer, 'active');
};

MobileTextEditor.prototype.scrollToView = function() {
  var coords = this.instance.getSelectedRange().highlight;
  this.instance.view.scrollViewport(coords);
};

MobileTextEditor.prototype.hideCellPointer = function() {
  if (!hasClass(this.cellPointer, 'hidden')) {
    addClass(this.cellPointer, 'hidden');
  }
};

MobileTextEditor.prototype.updateEditorPosition = function(x, y) {
  if (x && y) {
    x = parseInt(x, 10);
    y = parseInt(y, 10);

    this.editorContainer.style.top = `${y}px`;
    this.editorContainer.style.left = `${x}px`;

  } else {
    var selection = this.instance.getSelected(),
      selectedCell = this.instance.getCell(selection[0], selection[1]);

    // cache sizes
    if (!domDimensionsCache.cellPointer) {
      domDimensionsCache.cellPointer = {
        height: outerHeight(this.cellPointer),
        width: outerWidth(this.cellPointer)
      };
    }
    if (!domDimensionsCache.editorContainer) {
      domDimensionsCache.editorContainer = {
        width: outerWidth(this.editorContainer)
      };
    }

    if (selectedCell !== undefined) {
      var scrollLeft = this.instance.view.wt.wtOverlays.leftOverlay
          .trimmingContainer == window ? 0 : getScrollLeft(this.instance.view.wt.wtOverlays.leftOverlay.holder);
      var scrollTop = this.instance.view.wt.wtOverlays.topOverlay
          .trimmingContainer == window ? 0 : getScrollTop(this.instance.view.wt.wtOverlays.topOverlay.holder);

      var selectedCellOffset = offset(selectedCell),
        selectedCellWidth = outerWidth(selectedCell),
        currentScrollPosition = {
          x: scrollLeft,
          y: scrollTop
        };

      this.editorContainer.style.top = `${parseInt(selectedCellOffset.top + outerHeight(selectedCell) -
          currentScrollPosition.y + domDimensionsCache.cellPointer.height, 10)}px`;
      this.editorContainer.style.left = `${parseInt((window.innerWidth / 2) - (domDimensionsCache.editorContainer.width / 2), 10)}px`;

      if (selectedCellOffset.left + (selectedCellWidth / 2) > parseInt(this.editorContainer.style.left, 10) +
          domDimensionsCache.editorContainer.width) {
        this.editorContainer.style.left = `${window.innerWidth - domDimensionsCache.editorContainer.width}px`;

      } else if (selectedCellOffset.left + (selectedCellWidth / 2) < parseInt(this.editorContainer.style.left, 10) + 20) {
        this.editorContainer.style.left = `${0}px`;
      }

      this.cellPointer.style.left = `${parseInt(selectedCellOffset.left - (domDimensionsCache.cellPointer.width / 2) -
        offset(this.editorContainer).left + (selectedCellWidth / 2) - currentScrollPosition.x, 10)}px`;
    }
  }
};

MobileTextEditor.prototype.updateEditorData = function() {
  var selected = this.instance.getSelected(),
    selectedValue = this.instance.getDataAtCell(selected[0], selected[1]);

  this.row = selected[0];
  this.col = selected[1];
  this.setValue(selectedValue);
  this.updateEditorPosition();
};

MobileTextEditor.prototype.prepareAndSave = function() {
  var val;

  if (!this.valueChanged()) {
    return;
  }

  if (this.instance.getSettings().trimWhitespace) {
    val = [
      [String.prototype.trim.call(this.getValue())]
    ];
  } else {
    val = [
      [this.getValue()]
    ];
  }

  this.saveValue(val);
};

MobileTextEditor.prototype.bindEvents = function() {
  var that = this;

  this.eventManager.addEventListener(this.controls.leftButton, 'touchend', (event) => {
    that.prepareAndSave();
    that.instance.selection.transformStart(0, -1, null, true);
    that.updateEditorData();
    event.preventDefault();
  });
  this.eventManager.addEventListener(this.controls.rightButton, 'touchend', (event) => {
    that.prepareAndSave();
    that.instance.selection.transformStart(0, 1, null, true);
    that.updateEditorData();
    event.preventDefault();
  });
  this.eventManager.addEventListener(this.controls.upButton, 'touchend', (event) => {
    that.prepareAndSave();
    that.instance.selection.transformStart(-1, 0, null, true);
    that.updateEditorData();
    event.preventDefault();
  });
  this.eventManager.addEventListener(this.controls.downButton, 'touchend', (event) => {
    that.prepareAndSave();
    that.instance.selection.transformStart(1, 0, null, true);
    that.updateEditorData();
    event.preventDefault();
  });

  this.eventManager.addEventListener(this.moveHandle, 'touchstart', function(event) {
    if (event.touches.length == 1) {
      var touch = event.touches[0];
      var onTouchPosition = {
        x: that.editorContainer.offsetLeft,
        y: that.editorContainer.offsetTop
      };
      var onTouchOffset = {
        x: touch.pageX - onTouchPosition.x,
        y: touch.pageY - onTouchPosition.y
      };

      that.eventManager.addEventListener(this, 'touchmove', (event) => {
        var touch = event.touches[0];
        that.updateEditorPosition(touch.pageX - onTouchOffset.x, touch.pageY - onTouchOffset.y);
        that.hideCellPointer();
        event.preventDefault();
      });

    }
  });

  this.eventManager.addEventListener(document.body, 'touchend', (event) => {
    if (!isChildOf(event.target, that.editorContainer) && !isChildOf(event.target, that.instance.rootElement)) {
      that.close();
    }
  });

  this.eventManager.addEventListener(this.instance.view.wt.wtOverlays.leftOverlay.holder, 'scroll', (event) => {
    if (that.instance.view.wt.wtOverlays.leftOverlay.trimmingContainer != window) {
      that.hideCellPointer();
    }
  });

  this.eventManager.addEventListener(this.instance.view.wt.wtOverlays.topOverlay.holder, 'scroll', (event) => {
    if (that.instance.view.wt.wtOverlays.topOverlay.trimmingContainer != window) {
      that.hideCellPointer();
    }
  });

};

MobileTextEditor.prototype.destroy = function() {
  this.eventManager.clear();

  this.editorContainer.parentNode.removeChild(this.editorContainer);
};

export default MobileTextEditor;