import _extends from 'babel-runtime/helpers/extends';
import ReactDOM from 'react-dom';
import scrollIntoView from 'dom-scroll-into-view';
import has from 'lodash/has';
import createBaseForm from './createBaseForm';
import { mixin as formMixin } from './createForm';
import { getParams } from './utils';

function computedStyle(el, prop) {
  var getComputedStyle = window.getComputedStyle;
  var style =
  // If we have getComputedStyle
  getComputedStyle ?
  // Query it
  // TODO: From CSS-Query notes, we might need (node, null) for FF
  getComputedStyle(el) :

  // Otherwise, we are in IE and use currentStyle
  el.currentStyle;
  if (style) {
    return style[
    // Switch to camelCase for CSSOM
    // DEV: Grabbed from jQuery
    // https://github.com/jquery/jquery/blob/1.9-stable/src/css.js#L191-L194
    // https://github.com/jquery/jquery/blob/1.9-stable/src/core.js#L593-L597
    prop.replace(/-(\w)/gi, function (word, letter) {
      return letter.toUpperCase();
    })];
  }
  return undefined;
}

function getScrollableContainer(n) {
  var node = n;
  var nodeName = void 0;
  /* eslint no-cond-assign:0 */
  while ((nodeName = node.nodeName.toLowerCase()) !== 'body') {
    var overflowY = computedStyle(node, 'overflowY');
    // https://stackoverflow.com/a/36900407/3040605
    if (node !== n && (overflowY === 'auto' || overflowY === 'scroll') && node.scrollHeight > node.clientHeight) {
      return node;
    }
    node = node.parentNode;
  }
  return nodeName === 'body' ? node.ownerDocument : node;
}

var mixin = {
  getForm: function getForm() {
    return _extends({}, formMixin.getForm.call(this), {
      validateFieldsAndScroll: this.validateFieldsAndScroll
    });
  },
  validateFieldsAndScroll: function validateFieldsAndScroll(ns, opt, cb) {
    var _this = this;

    var _getParams = getParams(ns, opt, cb),
        names = _getParams.names,
        callback = _getParams.callback,
        options = _getParams.options;

    var newCb = function newCb(error, values) {
      if (error) {
        var validNames = _this.fieldsStore.getValidFieldsName();
        var firstNode = void 0;
        var firstTop = void 0;
        var _iteratorNormalCompletion = true;
        var _didIteratorError = false;
        var _iteratorError = undefined;

        try {
          for (var _iterator = validNames[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
            var name = _step.value;

            if (has(error, name)) {
              var instance = _this.getFieldInstance(name);
              if (instance) {
                var node = ReactDOM.findDOMNode(instance);
                var top = node.getBoundingClientRect().top;
                if (firstTop === undefined || firstTop > top) {
                  firstTop = top;
                  firstNode = node;
                }
              }
            }
          }
        } catch (err) {
          _didIteratorError = true;
          _iteratorError = err;
        } finally {
          try {
            if (!_iteratorNormalCompletion && _iterator['return']) {
              _iterator['return']();
            }
          } finally {
            if (_didIteratorError) {
              throw _iteratorError;
            }
          }
        }

        if (firstNode) {
          var c = options.container || getScrollableContainer(firstNode);
          scrollIntoView(firstNode, c, _extends({
            onlyScrollIfNeeded: true
          }, options.scroll));
        }
      }

      if (typeof callback === 'function') {
        callback(error, values);
      }
    };

    return this.validateFields(names, options, newCb);
  }
};

function createDOMForm(option) {
  return createBaseForm(_extends({}, option), [mixin]);
}

export default createDOMForm;