/**
 * Takes an array of [keyValue1, keyValue2] pairs and creates an object of {keyValue1: keyValue2, keyValue2: keyValue1}
 * @param {Array} array the array of pairs
 * @return {Object} the {key, value} pair object
 */
function arrayToObject(array) {
  return array.reduce(function (obj, _ref) {
    var prop1 = _ref[0],
      prop2 = _ref[1];
    obj[prop1] = prop2;
    obj[prop2] = prop1;
    return obj;
  }, {});
}
function isBoolean(val) {
  return typeof val === 'boolean';
}
function isFunction(val) {
  return typeof val === 'function';
}
function isNumber(val) {
  return typeof val === 'number';
}
function isNullOrUndefined(val) {
  return val === null || typeof val === 'undefined';
}
function isObject(val) {
  return val && typeof val === 'object';
}
function isString(val) {
  return typeof val === 'string';
}
function includes(inclusive, inclusee) {
  return inclusive.indexOf(inclusee) !== -1;
}

/**
 * Flip the sign of a CSS value, possibly with a unit.
 *
 * We can't just negate the value with unary minus due to the units.
 *
 * @private
 * @param {String} value - the original value (for example 77%)
 * @return {String} the result (for example -77%)
 */
function flipSign(value) {
  if (parseFloat(value) === 0) {
    // Don't mangle zeroes
    return value;
  }
  if (value[0] === '-') {
    return value.slice(1);
  }
  return "-" + value;
}
function flipTransformSign(match, prefix, offset, suffix) {
  return prefix + flipSign(offset) + suffix;
}

/**
 * Takes a percentage for background position and inverts it.
 * This was copied and modified from CSSJanus:
 * https://github.com/cssjanus/cssjanus/blob/4245f834365f6cfb0239191a151432fb85abab23/src/cssjanus.js#L152-L175
 * @param {String} value - the original value (for example 77%)
 * @return {String} the result (for example 23%)
 */
function calculateNewBackgroundPosition(value) {
  var idx = value.indexOf('.');
  if (idx === -1) {
    value = 100 - parseFloat(value) + "%";
  } else {
    // Two off, one for the "%" at the end, one for the dot itself
    var len = value.length - idx - 2;
    value = 100 - parseFloat(value);
    value = value.toFixed(len) + "%";
  }
  return value;
}

/**
 * This takes a list of CSS values and converts it to an array
 * @param {String} value - something like `1px`, `1px 2em`, or `3pt rgb(150, 230, 550) 40px calc(100% - 5px)`
 * @return {Array} the split values (for example: `['3pt', 'rgb(150, 230, 550)', '40px', 'calc(100% - 5px)']`)
 */
function getValuesAsList(value) {
  return value.replace(/ +/g, ' ') // remove all extraneous spaces
  .split(' ').map(function (i) {
    return i.trim();
  }) // get rid of extra space before/after each item
  .filter(Boolean) // get rid of empty strings
  // join items which are within parenthese
  // luckily `calc (100% - 5px)` is invalid syntax and it must be `calc(100% - 5px)`, otherwise this would be even more complex
  .reduce(function (_ref2, item) {
    var list = _ref2.list,
      state = _ref2.state;
    var openParansCount = (item.match(/\(/g) || []).length;
    var closedParansCount = (item.match(/\)/g) || []).length;
    if (state.parensDepth > 0) {
      list[list.length - 1] = list[list.length - 1] + " " + item;
    } else {
      list.push(item);
    }
    state.parensDepth += openParansCount - closedParansCount;
    return {
      list: list,
      state: state
    };
  }, {
    list: [],
    state: {
      parensDepth: 0
    }
  }).list;
}

/**
 * This is intended for properties that are `top right bottom left` and will switch them to `top left bottom right`
 * @param {String} value - `1px 2px 3px 4px` for example, but also handles cases where there are too few/too many and
 * simply returns the value in those cases (which is the correct behavior)
 * @return {String} the result - `1px 4px 3px 2px` for example.
 */
function handleQuartetValues(value) {
  var splitValues = getValuesAsList(value);
  if (splitValues.length <= 3 || splitValues.length > 4) {
    return value;
  }
  var top = splitValues[0],
    right = splitValues[1],
    bottom = splitValues[2],
    left = splitValues[3];
  return [top, left, bottom, right].join(' ');
}

/**
 *
 * @param {String|Number|Object} value css property value to test
 * @returns If the css property value can(should?) have an RTL equivalent
 */
function canConvertValue(value) {
  return !isBoolean(value) && !isNullOrUndefined(value);
}

/**
 * Splits a shadow style into its separate shadows using the comma delimiter, but creating an exception
 * for comma separated values in parentheses often used for rgba colours.
 * @param {String} value
 * @returns {Array} array of all box shadow values in the string
 */
function splitShadow(value) {
  var shadows = [];
  var start = 0;
  var end = 0;
  var rgba = false;
  while (end < value.length) {
    if (!rgba && value[end] === ',') {
      shadows.push(value.substring(start, end).trim());
      end++;
      start = end;
    } else if (value[end] === "(") {
      rgba = true;
      end++;
    } else if (value[end] === ')') {
      rgba = false;
      end++;
    } else {
      end++;
    }
  }

  // push the last shadow value if there is one
  // istanbul ignore next
  if (start != end) {
    shadows.push(value.substring(start, end + 1));
  }
  return shadows;
}

// some values require a little fudging, that fudging goes here.
var propertyValueConverters = {
  padding: function padding(_ref) {
    var value = _ref.value;
    if (isNumber(value)) {
      return value;
    }
    return handleQuartetValues(value);
  },
  textShadow: function textShadow(_ref2) {
    var value = _ref2.value;
    var flippedShadows = splitShadow(value).map(function (shadow) {
      // intentionally leaving off the `g` flag here because we only want to change the first number (which is the offset-x)
      return shadow.replace(/(^|\s)(-*)([.|\d]+)/, function (match, whiteSpace, negative, number) {
        if (number === '0') {
          return match;
        }
        var doubleNegative = negative === '' ? '-' : '';
        return "" + whiteSpace + doubleNegative + number;
      });
    });
    return flippedShadows.join(',');
  },
  borderColor: function borderColor(_ref3) {
    var value = _ref3.value;
    return handleQuartetValues(value);
  },
  borderRadius: function borderRadius(_ref4) {
    var value = _ref4.value;
    if (isNumber(value)) {
      return value;
    }
    if (includes(value, '/')) {
      var _value$split = value.split('/'),
        radius1 = _value$split[0],
        radius2 = _value$split[1];
      var convertedRadius1 = propertyValueConverters.borderRadius({
        value: radius1.trim()
      });
      var convertedRadius2 = propertyValueConverters.borderRadius({
        value: radius2.trim()
      });
      return convertedRadius1 + " / " + convertedRadius2;
    }
    var splitValues = getValuesAsList(value);
    switch (splitValues.length) {
      case 2:
        {
          return splitValues.reverse().join(' ');
        }
      case 4:
        {
          var topLeft = splitValues[0],
            topRight = splitValues[1],
            bottomRight = splitValues[2],
            bottomLeft = splitValues[3];
          return [topRight, topLeft, bottomLeft, bottomRight].join(' ');
        }
      default:
        {
          return value;
        }
    }
  },
  background: function background(_ref5) {
    var value = _ref5.value,
      valuesToConvert = _ref5.valuesToConvert,
      isRtl = _ref5.isRtl,
      bgImgDirectionRegex = _ref5.bgImgDirectionRegex,
      bgPosDirectionRegex = _ref5.bgPosDirectionRegex;
    if (isNumber(value)) {
      return value;
    }

    // Yeah, this is in need of a refactor 🙃...
    // but this property is a tough cookie 🍪
    // get the backgroundPosition out of the string by removing everything that couldn't be the backgroundPosition value
    var backgroundPositionValue = value.replace(/(url\(.*?\))|(rgba?\(.*?\))|(hsl\(.*?\))|(#[a-fA-F0-9]+)|((^| )(\D)+( |$))/g, '').trim();
    // replace that backgroundPosition value with the converted version
    value = value.replace(backgroundPositionValue, propertyValueConverters.backgroundPosition({
      value: backgroundPositionValue,
      valuesToConvert: valuesToConvert,
      isRtl: isRtl,
      bgPosDirectionRegex: bgPosDirectionRegex
    }));
    // do the backgroundImage value replacing on the whole value (because why not?)
    return propertyValueConverters.backgroundImage({
      value: value,
      valuesToConvert: valuesToConvert,
      bgImgDirectionRegex: bgImgDirectionRegex
    });
  },
  backgroundImage: function backgroundImage(_ref6) {
    var value = _ref6.value,
      valuesToConvert = _ref6.valuesToConvert,
      bgImgDirectionRegex = _ref6.bgImgDirectionRegex;
    if (!includes(value, 'url(') && !includes(value, 'linear-gradient(')) {
      return value;
    }
    return value.replace(bgImgDirectionRegex, function (match, g1, group2) {
      return match.replace(group2, valuesToConvert[group2]);
    });
  },
  backgroundPosition: function backgroundPosition(_ref7) {
    var value = _ref7.value,
      valuesToConvert = _ref7.valuesToConvert,
      isRtl = _ref7.isRtl,
      bgPosDirectionRegex = _ref7.bgPosDirectionRegex;
    return value
    // intentionally only grabbing the first instance of this because that represents `left`
    .replace(isRtl ? /^((-|\d|\.)+%)/ : null, function (match, group) {
      return calculateNewBackgroundPosition(group);
    }).replace(bgPosDirectionRegex, function (match) {
      return valuesToConvert[match];
    });
  },
  backgroundPositionX: function backgroundPositionX(_ref8) {
    var value = _ref8.value,
      valuesToConvert = _ref8.valuesToConvert,
      isRtl = _ref8.isRtl,
      bgPosDirectionRegex = _ref8.bgPosDirectionRegex;
    if (isNumber(value)) {
      return value;
    }
    return propertyValueConverters.backgroundPosition({
      value: value,
      valuesToConvert: valuesToConvert,
      isRtl: isRtl,
      bgPosDirectionRegex: bgPosDirectionRegex
    });
  },
  transition: function transition(_ref9) {
    var value = _ref9.value,
      propertiesToConvert = _ref9.propertiesToConvert;
    return value.split(/,\s*/g).map(function (transition) {
      var values = transition.split(' ');

      // Property is always defined first
      values[0] = propertiesToConvert[values[0]] || values[0];
      return values.join(' ');
    }).join(', ');
  },
  transitionProperty: function transitionProperty(_ref10) {
    var value = _ref10.value,
      propertiesToConvert = _ref10.propertiesToConvert;
    return value.split(/,\s*/g).map(function (prop) {
      return propertiesToConvert[prop] || prop;
    }).join(', ');
  },
  transform: function transform(_ref11) {
    var value = _ref11.value;
    // This was copied and modified from CSSJanus:
    // https://github.com/cssjanus/cssjanus/blob/4a40f001b1ba35567112d8b8e1d9d95eda4234c3/src/cssjanus.js#L152-L153
    var nonAsciiPattern = "[^\\u0020-\\u007e]";
    var escapePattern = "(?:" + '(?:(?:\\[0-9a-f]{1,6})(?:\\r\\n|\\s)?)' + "|\\\\[^\\r\\n\\f0-9a-f])";
    var signedQuantPattern = "((?:-?" + ('(?:[0-9]*\\.[0-9]+|[0-9]+)' + "(?:\\s*" + '(?:em|ex|px|cm|mm|in|pt|pc|deg|rad|grad|ms|s|hz|khz|%)' + "|" + ("-?" + ("(?:[_a-z]|" + nonAsciiPattern + "|" + escapePattern + ")") + ("(?:[_a-z0-9-]|" + nonAsciiPattern + "|" + escapePattern + ")") + "*") + ")?") + ")|(?:inherit|auto))";
    var translateXRegExp = new RegExp("(translateX\\s*\\(\\s*)" + signedQuantPattern + "(\\s*\\))", 'gi');
    var translateRegExp = new RegExp("(translate\\s*\\(\\s*)" + signedQuantPattern + "((?:\\s*,\\s*" + signedQuantPattern + "){0,1}\\s*\\))", 'gi');
    var translate3dRegExp = new RegExp("(translate3d\\s*\\(\\s*)" + signedQuantPattern + "((?:\\s*,\\s*" + signedQuantPattern + "){0,2}\\s*\\))", 'gi');
    var rotateRegExp = new RegExp("(rotate[ZY]?\\s*\\(\\s*)" + signedQuantPattern + "(\\s*\\))", 'gi');
    return value.replace(translateXRegExp, flipTransformSign).replace(translateRegExp, flipTransformSign).replace(translate3dRegExp, flipTransformSign).replace(rotateRegExp, flipTransformSign);
  }
};
propertyValueConverters.objectPosition = propertyValueConverters.backgroundPosition;
propertyValueConverters.margin = propertyValueConverters.padding;
propertyValueConverters.borderWidth = propertyValueConverters.padding;
propertyValueConverters.boxShadow = propertyValueConverters.textShadow;
propertyValueConverters.webkitBoxShadow = propertyValueConverters.boxShadow;
propertyValueConverters.mozBoxShadow = propertyValueConverters.boxShadow;
propertyValueConverters.WebkitBoxShadow = propertyValueConverters.boxShadow;
propertyValueConverters.MozBoxShadow = propertyValueConverters.boxShadow;
propertyValueConverters.borderStyle = propertyValueConverters.borderColor;
propertyValueConverters.webkitTransform = propertyValueConverters.transform;
propertyValueConverters.mozTransform = propertyValueConverters.transform;
propertyValueConverters.WebkitTransform = propertyValueConverters.transform;
propertyValueConverters.MozTransform = propertyValueConverters.transform;
propertyValueConverters.transformOrigin = propertyValueConverters.backgroundPosition;
propertyValueConverters.webkitTransformOrigin = propertyValueConverters.transformOrigin;
propertyValueConverters.mozTransformOrigin = propertyValueConverters.transformOrigin;
propertyValueConverters.WebkitTransformOrigin = propertyValueConverters.transformOrigin;
propertyValueConverters.MozTransformOrigin = propertyValueConverters.transformOrigin;
propertyValueConverters.webkitTransition = propertyValueConverters.transition;
propertyValueConverters.mozTransition = propertyValueConverters.transition;
propertyValueConverters.WebkitTransition = propertyValueConverters.transition;
propertyValueConverters.MozTransition = propertyValueConverters.transition;
propertyValueConverters.webkitTransitionProperty = propertyValueConverters.transitionProperty;
propertyValueConverters.mozTransitionProperty = propertyValueConverters.transitionProperty;
propertyValueConverters.WebkitTransitionProperty = propertyValueConverters.transitionProperty;
propertyValueConverters.MozTransitionProperty = propertyValueConverters.transitionProperty;

// kebab-case versions

propertyValueConverters['text-shadow'] = propertyValueConverters.textShadow;
propertyValueConverters['border-color'] = propertyValueConverters.borderColor;
propertyValueConverters['border-radius'] = propertyValueConverters.borderRadius;
propertyValueConverters['background-image'] = propertyValueConverters.backgroundImage;
propertyValueConverters['background-position'] = propertyValueConverters.backgroundPosition;
propertyValueConverters['background-position-x'] = propertyValueConverters.backgroundPositionX;
propertyValueConverters['object-position'] = propertyValueConverters.objectPosition;
propertyValueConverters['border-width'] = propertyValueConverters.padding;
propertyValueConverters['box-shadow'] = propertyValueConverters.textShadow;
propertyValueConverters['-webkit-box-shadow'] = propertyValueConverters.textShadow;
propertyValueConverters['-moz-box-shadow'] = propertyValueConverters.textShadow;
propertyValueConverters['border-style'] = propertyValueConverters.borderColor;
propertyValueConverters['-webkit-transform'] = propertyValueConverters.transform;
propertyValueConverters['-moz-transform'] = propertyValueConverters.transform;
propertyValueConverters['transform-origin'] = propertyValueConverters.transformOrigin;
propertyValueConverters['-webkit-transform-origin'] = propertyValueConverters.transformOrigin;
propertyValueConverters['-moz-transform-origin'] = propertyValueConverters.transformOrigin;
propertyValueConverters['-webkit-transition'] = propertyValueConverters.transition;
propertyValueConverters['-moz-transition'] = propertyValueConverters.transition;
propertyValueConverters['transition-property'] = propertyValueConverters.transitionProperty;
propertyValueConverters['-webkit-transition-property'] = propertyValueConverters.transitionProperty;
propertyValueConverters['-moz-transition-property'] = propertyValueConverters.transitionProperty;

// this will be an object of properties that map to their corresponding rtl property (their doppelganger)
var propertiesToConvert = arrayToObject([['paddingLeft', 'paddingRight'], ['marginLeft', 'marginRight'], ['left', 'right'], ['borderLeft', 'borderRight'], ['borderLeftColor', 'borderRightColor'], ['borderLeftStyle', 'borderRightStyle'], ['borderLeftWidth', 'borderRightWidth'], ['borderTopLeftRadius', 'borderTopRightRadius'], ['borderBottomLeftRadius', 'borderBottomRightRadius'],
// kebab-case versions
['padding-left', 'padding-right'], ['margin-left', 'margin-right'], ['border-left', 'border-right'], ['border-left-color', 'border-right-color'], ['border-left-style', 'border-right-style'], ['border-left-width', 'border-right-width'], ['border-top-left-radius', 'border-top-right-radius'], ['border-bottom-left-radius', 'border-bottom-right-radius']]);
var propsToIgnore = ['content'];

// this is the same as the propertiesToConvert except for values
var valuesToConvert = arrayToObject([['ltr', 'rtl'], ['left', 'right'], ['w-resize', 'e-resize'], ['sw-resize', 'se-resize'], ['nw-resize', 'ne-resize']]);

// Sorry for the regex 😞, but basically thisis used to replace _every_ instance of
// `ltr`, `rtl`, `right`, and `left` in `backgroundimage` with the corresponding opposite.
// A situation we're accepting here:
// url('/left/right/rtl/ltr.png') will be changed to url('/right/left/ltr/rtl.png')
// Definite trade-offs here, but I think it's a good call.
var bgImgDirectionRegex = new RegExp('(^|\\W|_)((ltr)|(rtl)|(left)|(right))(\\W|_|$)', 'g');
var bgPosDirectionRegex = new RegExp('(left)|(right)');

/**
 * converts properties and values in the CSS in JS object to their corresponding RTL values
 * @param {Object} object the CSS in JS object
 * @return {Object} the RTL converted object
 */
function convert(object) {
  return Object.keys(object).reduce(function (newObj, originalKey) {
    var originalValue = object[originalKey];
    if (isString(originalValue)) {
      // you're welcome to later code 😺
      originalValue = originalValue.trim();
    }

    // Some properties should never be transformed
    if (includes(propsToIgnore, originalKey)) {
      newObj[originalKey] = originalValue;
      return newObj;
    }
    var _convertProperty = convertProperty(originalKey, originalValue),
      key = _convertProperty.key,
      value = _convertProperty.value;
    newObj[key] = value;
    return newObj;
  }, Array.isArray(object) ? [] : {});
}

/**
 * Converts a property and its value to the corresponding RTL key and value
 * @param {String} originalKey the original property key
 * @param {Number|String|Object} originalValue the original css property value
 * @return {Object} the new {key, value} pair
 */
function convertProperty(originalKey, originalValue) {
  var isNoFlip = /\/\*\s?@noflip\s?\*\//.test(originalValue);
  var key = isNoFlip ? originalKey : getPropertyDoppelganger(originalKey);
  var value = isNoFlip ? originalValue : getValueDoppelganger(key, originalValue);
  return {
    key: key,
    value: value
  };
}

/**
 * This gets the RTL version of the given property if it has a corresponding RTL property
 * @param {String} property the name of the property
 * @return {String} the name of the RTL property
 */
function getPropertyDoppelganger(property) {
  return propertiesToConvert[property] || property;
}

/**
 * This converts the given value to the RTL version of that value based on the key
 * @param {String} key this is the key (note: this should be the RTL version of the originalKey)
 * @param {String|Number|Object} originalValue the original css property value. If it's an object, then we'll convert that as well
 * @return {String|Number|Object} the converted value
 */
function getValueDoppelganger(key, originalValue) {
  if (!canConvertValue(originalValue)) {
    return originalValue;
  }
  if (isObject(originalValue)) {
    return convert(originalValue); // recursion 🌀
  }

  var isNum = isNumber(originalValue);
  var isFunc = isFunction(originalValue);
  var importantlessValue = isNum || isFunc ? originalValue : originalValue.replace(/ !important.*?$/, '');
  var isImportant = !isNum && importantlessValue.length !== originalValue.length;
  var valueConverter = propertyValueConverters[key];
  var newValue;
  if (valueConverter) {
    newValue = valueConverter({
      value: importantlessValue,
      valuesToConvert: valuesToConvert,
      propertiesToConvert: propertiesToConvert,
      isRtl: true,
      bgImgDirectionRegex: bgImgDirectionRegex,
      bgPosDirectionRegex: bgPosDirectionRegex
    });
  } else {
    newValue = valuesToConvert[importantlessValue] || importantlessValue;
  }
  if (isImportant) {
    return newValue + " !important";
  }
  return newValue;
}

export { propertiesToConvert as a, propsToIgnore as b, convert as c, convertProperty as d, getValueDoppelganger as e, arrayToObject as f, getPropertyDoppelganger as g, calculateNewBackgroundPosition as h, canConvertValue as i, flipTransformSign as j, flipSign as k, handleQuartetValues as l, includes as m, isBoolean as n, isFunction as o, propertyValueConverters as p, isNumber as q, isNullOrUndefined as r, isObject as s, isString as t, getValuesAsList as u, valuesToConvert as v, splitShadow as w };