text: var InvalidPropertyError = require('./invalid-property-error');
  
  var wrapSingle = require('../wrap-for-optimizing').single;
  
  var Token = require('../../tokenizer/token');
  var Marker = require('../../tokenizer/marker');
  
  var formatPosition = require('../../utils/format-position');
  
  function _anyIsInherit(values) {
    var i, l;
  
    for (i = 0, l = values.length; i < l; i++) {
      if (values[i][1] == 'inherit') {
        return true;
      }
    }
  
    return false;
  }
  
  function _colorFilter(validator) {
    return function (value) {
      return value[1] == 'invert' || validator.isColor(value[1]) || validator.isPrefixed(value[1]);
    };
  }
  
  function _styleFilter(validator) {
    return function (value) {
      return value[1] != 'inherit' && validator.isStyleKeyword(value[1]) && !validator.isColorFunction(value[1]);
    };
  }
  
  function _wrapDefault(name, property, compactable) {
    var descriptor = compactable[name];
    if (descriptor.doubleValues && descriptor.defaultValue.length == 2) {
      return wrapSingle([
        Token.PROPERTY,
        [Token.PROPERTY_NAME, name],
        [Token.PROPERTY_VALUE, descriptor.defaultValue[0]],
        [Token.PROPERTY_VALUE, descriptor.defaultValue[1]]
      ]);
    } else if (descriptor.doubleValues && descriptor.defaultValue.length == 1) {
      return wrapSingle([
        Token.PROPERTY,
        [Token.PROPERTY_NAME, name],
        [Token.PROPERTY_VALUE, descriptor.defaultValue[0]]
      ]);
    } else {
      return wrapSingle([
        Token.PROPERTY,
        [Token.PROPERTY_NAME, name],
        [Token.PROPERTY_VALUE, descriptor.defaultValue]
      ]);
    }
  }
  
  function _widthFilter(validator) {
    return function (value) {
      return value[1] != 'inherit' &&
        (validator.isWidth(value[1]) || validator.isUnit(value[1]) && !validator.isDynamicUnit(value[1])) &&
        !validator.isStyleKeyword(value[1]) &&
        !validator.isColorFunction(value[1]);
    };
  }
  
  function animation(property, compactable, validator) {
    var duration = _wrapDefault(property.name + '-duration', property, compactable);
    var timing = _wrapDefault(property.name + '-timing-function', property, compactable);
    var delay = _wrapDefault(property.name + '-delay', property, compactable);
    var iteration = _wrapDefault(property.name + '-iteration-count', property, compactable);
    var direction = _wrapDefault(property.name + '-direction', property, compactable);
    var fill = _wrapDefault(property.name + '-fill-mode', property, compactable);
    var play = _wrapDefault(property.name + '-play-state', property, compactable);
    var name = _wrapDefault(property.name + '-name', property, compactable);
    var components = [duration, timing, delay, iteration, direction, fill, play, name];
    var values = property.value;
    var value;
    var durationSet = false;
    var timingSet = false;
    var delaySet = false;
    var iterationSet = false;
    var directionSet = false;
    var fillSet = false;
    var playSet = false;
    var nameSet = false;
    var i;
    var l;
  
    if (property.value.length == 1 && property.value[0][1] == 'inherit') {
      duration.value = timing.value = delay.value = iteration.value = direction.value = fill.value = play.value = name.value = property.value;
      return components;
    }
  
    if (values.length > 1 && _anyIsInherit(values)) {
      throw new InvalidPropertyError('Invalid animation values at ' + formatPosition(values[0][2][0]) + '. Ignoring.');
    }
  
    for (i = 0, l = values.length; i < l; i++) {
      value = values[i];
  
      if (validator.isTime(value[1]) && !durationSet) {
        duration.value = [value];
        durationSet = true;
      } else if (validator.isTime(value[1]) && !delaySet) {
        delay.value = [value];
        delaySet = true;
      } else if ((validator.isGlobal(value[1]) || validator.isAnimationTimingFunction(value[1])) && !timingSet) {
        timing.value = [value];
        timingSet = true;
      } else if ((validator.isAnimationIterationCountKeyword(value[1]) || validator.isPositiveNumber(value[1])) && !iterationSet) {
        iteration.value = [value];
        iterationSet = true;
      } else if (validator.isAnimationDirectionKeyword(value[1]) && !directionSet) {
        direction.value = [value];
        directionSet = true;
      } else if (validator.isAnimationFillModeKeyword(value[1]) && !fillSet) {
        fill.value = [value];
        fillSet = true;
      } else if (validator.isAnimationPlayStateKeyword(value[1]) && !playSet) {
        play.value = [value];
        playSet = true;
      } else if ((validator.isAnimationNameKeyword(value[1]) || validator.isIdentifier(value[1])) && !nameSet) {
        name.value = [value];
        nameSet = true;
      } else {
        throw new InvalidPropertyError('Invalid animation value at ' + formatPosition(value[2][0]) + '. Ignoring.');
      }
    }
  
    return components;
  }
  
  function background(property, compactable, validator) {
    var image = _wrapDefault('background-image', property, compactable);
    var position = _wrapDefault('background-position', property, compactable);
    var size = _wrapDefault('background-size', property, compactable);
    var repeat = _wrapDefault('background-repeat', property, compactable);
    var attachment = _wrapDefault('background-attachment', property, compactable);
    var origin = _wrapDefault('background-origin', property, compactable);
    var clip = _wrapDefault('background-clip', property, compactable);
    var color = _wrapDefault('background-color', property, compactable);
    var components = [image, position, size, repeat, attachment, origin, clip, color];
    var values = property.value;
  
    var positionSet = false;
    var clipSet = false;
    var originSet = false;
    var repeatSet = false;
  
    var anyValueSet = false;
  
    if (property.value.length == 1 && property.value[0][1] == 'inherit') {
      // NOTE: 'inherit' is not a valid value for background-attachment
      color.value = image.value =  repeat.value = position.value = size.value = origin.value = clip.value = property.value;
      return components;
    }
  
    if (property.value.length == 1 && property.value[0][1] == '0 0') {
      return components;
    }
  
    for (var i = values.length - 1; i >= 0; i--) {
      var value = values[i];
  
      if (validator.isBackgroundAttachmentKeyword(value[1])) {
        attachment.value = [value];
        anyValueSet = true;
      } else if (validator.isBackgroundClipKeyword(value[1]) || validator.isBackgroundOriginKeyword(value[1])) {
        if (clipSet) {
          origin.value = [value];
          originSet = true;
        } else {
          clip.value = [value];
          clipSet = true;
        }
        anyValueSet = true;
      } else if (validator.isBackgroundRepeatKeyword(value[1])) {
        if (repeatSet) {
          repeat.value.unshift(value);
        } else {
          repeat.value = [value];
          repeatSet = true;
        }
        anyValueSet = true;
      } else if (validator.isBackgroundPositionKeyword(value[1]) || validator.isBackgroundSizeKeyword(value[1]) || validator.isUnit(value[1]) || validator.isDynamicUnit(value[1])) {
        if (i > 0) {
          var previousValue = values[i - 1];
  
          if (previousValue[1] == Marker.FORWARD_SLASH) {
            size.value = [value];
          } else if (i > 1 && values[i - 2][1] == Marker.FORWARD_SLASH) {
            size.value = [previousValue, value];
            i -= 2;
          } else {
            if (!positionSet)
              position.value = [];
  
            position.value.unshift(value);
            positionSet = true;
          }
        } else {
          if (!positionSet)
            position.value = [];
  
          position.value.unshift(value);
          positionSet = true;
        }
        anyValueSet = true;
      } else if ((color.value[0][1] == compactable[color.name].defaultValue || color.value[0][1] == 'none') && (validator.isColor(value[1]) || validator.isPrefixed(value[1]))) {
        color.value = [value];
        anyValueSet = true;
      } else if (validator.isUrl(value[1]) || validator.isFunction(value[1])) {
        image.value = [value];
        anyValueSet = true;
      }
    }
  
    if (clipSet && !originSet)
      origin.value = clip.value.slice(0);
  
    if (!anyValueSet) {
      throw new InvalidPropertyError('Invalid background value at ' + formatPosition(values[0][2][0]) + '. Ignoring.');
    }
  
    return components;
  }
  
  function borderRadius(property, compactable) {
    var values = property.value;
    var splitAt = -1;
  
    for (var i = 0, l = values.length; i < l; i++) {
      if (values[i][1] == Marker.FORWARD_SLASH) {
        splitAt = i;
        break;
      }
    }
  
    if (splitAt === 0 || splitAt === values.length - 1) {
      throw new InvalidPropertyError('Invalid border-radius value at ' + formatPosition(values[0][2][0]) + '. Ignoring.');
    }
  
    var target = _wrapDefault(property.name, property, compactable);
    target.value = splitAt > -1 ?
      values.slice(0, splitAt) :
      values.slice(0);
    target.components = fourValues(target, compactable);
  
    var remainder = _wrapDefault(property.name, property, compactable);
    remainder.value = splitAt > -1 ?
      values.slice(splitAt + 1) :
      values.slice(0);
    remainder.components = fourValues(remainder, compactable);
  
    for (var j = 0; j < 4; j++) {
      target.components[j].multiplex = true;
      target.components[j].value = target.components[j].value.concat(remainder.components[j].value);
    }
  
    return target.components;
  }
  
  function font(property, compactable, validator) {
    var style = _wrapDefault('font-style', property, compactable);
    var variant = _wrapDefault('font-variant', property, compactable);
    var weight = _wrapDefault('font-weight', property, compactable);
    var stretch = _wrapDefault('font-stretch', property, compactable);
    var size = _wrapDefault('font-size', property, compactable);
    var height = _wrapDefault('line-height', property, compactable);
    var family = _wrapDefault('font-family', property, compactable);
    var components = [style, variant, weight, stretch, size, height, family];
    var values = property.value;
    var fuzzyMatched = 4; // style, variant, weight, and stretch
    var index = 0;
    var isStretchSet = false;
    var isStretchValid;
    var isStyleSet = false;
    var isStyleValid;
    var isVariantSet = false;
    var isVariantValid;
    var isWeightSet = false;
    var isWeightValid;
    var isSizeSet = false;
    var appendableFamilyName = false;
  
    if (!values[index]) {
      throw new InvalidPropertyError('Missing font values at ' + formatPosition(property.all[property.position][1][2][0]) + '. Ignoring.');
    }
  
    if (values.length == 1 && values[0][1] == 'inherit') {
      style.value = variant.value = weight.value = stretch.value = size.value = height.value = family.value = values;
      return components;
    }
  
    if (values.length == 1 && (validator.isFontKeyword(values[0][1]) || validator.isGlobal(values[0][1]) || validator.isPrefixed(values[0][1]))) {
      values[0][1] = Marker.INTERNAL + values[0][1];
      style.value = variant.value = weight.value = stretch.value = size.value = height.value = family.value = values;
      return components;
    }
  
    if (values.length > 1 && _anyIsInherit(values)) {
      throw new InvalidPropertyError('Invalid font values at ' + formatPosition(values[0][2][0]) + '. Ignoring.');
    }
  
    // fuzzy match style, variant, weight, and stretch on first elements
    while (index < fuzzyMatched) {
      isStretchValid = validator.isFontStretchKeyword(values[index][1]) || validator.isGlobal(values[index][1]);
      isStyleValid = validator.isFontStyleKeyword(values[index][1]) || validator.isGlobal(values[index][1]);
      isVariantValid = validator.isFontVariantKeyword(values[index][1]) || validator.isGlobal(values[index][1]);
      isWeightValid = validator.isFontWeightKeyword(values[index][1]) || validator.isGlobal(values[index][1]);
  
      if (isStyleValid && !isStyleSet) {
        style.value = [values[index]];
        isStyleSet = true;
      } else if (isVariantValid && !isVariantSet) {
        variant.value = [values[index]];
        isVariantSet = true;
      } else if (isWeightValid && !isWeightSet) {
        weight.value = [values[index]];
        isWeightSet = true;
      } else if (isStretchValid && !isStretchSet) {
        stretch.value = [values[index]];
        isStretchSet = true;
      } else if (isStyleValid && isStyleSet || isVariantValid && isVariantSet || isWeightValid && isWeightSet || isStretchValid && isStretchSet) {
        throw new InvalidPropertyError('Invalid font style / variant / weight / stretch value at ' + formatPosition(values[0][2][0]) + '. Ignoring.');
      } else {
        break;
      }
  
      index++;
    }
  
    // now comes font-size ...
    if (validator.isFontSizeKeyword(values[index][1]) || validator.isUnit(values[index][1]) && !validator.isDynamicUnit(values[index][1])) {
      size.value = [values[index]];
      isSizeSet = true;
      index++;
    } else {
      throw new InvalidPropertyError('Missing font size at ' + formatPosition(values[0][2][0]) + '. Ignoring.');
    }
  
    if (!values[index]) {
      throw new InvalidPropertyError('Missing font family at ' + formatPosition(values[0][2][0]) + '. Ignoring.');
    }
  
    // ... and perhaps line-height
    if (isSizeSet && values[index] && values[index][1] == Marker.FORWARD_SLASH && values[index + 1] && (validator.isLineHeightKeyword(values[index + 1][1]) || validator.isUnit(values[index + 1][1]) || validator.isNumber(values[index + 1][1]))) {
      height.value = [values[index + 1]];
      index++;
      index++;
    }
  
    // ... and whatever comes next is font-family
    family.value = [];
  
    while (values[index]) {
      if (values[index][1] == Marker.COMMA) {
        appendableFamilyName = false;
      } else {
        if (appendableFamilyName) {
          family.value[family.value.length - 1][1] += Marker.SPACE + values[index][1];
        } else {
          family.value.push(values[index]);
        }
  
        appendableFamilyName = true;
      }
  
      index++;
    }
  
    if (family.value.length === 0) {
      throw new InvalidPropertyError('Missing font family at ' + formatPosition(values[0][2][0]) + '. Ignoring.');
    }
  
    return components;
  }
  
  function fourValues(property, compactable) {
    var componentNames = compactable[property.name].components;
    var components = [];
    var value = property.value;
  
    if (value.length < 1)
      return [];
  
    if (value.length < 2)
      value[1] = value[0].slice(0);
    if (value.length < 3)
      value[2] = value[0].slice(0);
    if (value.length < 4)
      value[3] = value[1].slice(0);
  
    for (var i = componentNames.length - 1; i >= 0; i--) {
      var component = wrapSingle([
        Token.PROPERTY,
        [Token.PROPERTY_NAME, componentNames[i]]
      ]);
      component.value = [value[i]];
      components.unshift(component);
    }
  
    return components;
  }
  
  function multiplex(splitWith) {
    return function (property, compactable, validator) {
      var splitsAt = [];
      var values = property.value;
      var i, j, l, m;
  
      // find split commas
      for (i = 0, l = values.length; i < l; i++) {
        if (values[i][1] == ',')
          splitsAt.push(i);
      }
  
      if (splitsAt.length === 0)
        return splitWith(property, compactable, validator);
  
      var splitComponents = [];
  
      // split over commas, and into components
      for (i = 0, l = splitsAt.length; i <= l; i++) {
        var from = i === 0 ? 0 : splitsAt[i - 1] + 1;
        var to = i < l ? splitsAt[i] : values.length;
  
        var _property = _wrapDefault(property.name, property, compactable);
        _property.value = values.slice(from, to);
  
        splitComponents.push(splitWith(_property, compactable, validator));
      }
  
      var components = splitComponents[0];
  
      // group component values from each split
      for (i = 0, l = components.length; i < l; i++) {
        components[i].multiplex = true;
  
        for (j = 1, m = splitComponents.length; j < m; j++) {
          components[i].value.push([Token.PROPERTY_VALUE, Marker.COMMA]);
          Array.prototype.push.apply(components[i].value, splitComponents[j][i].value);
        }
      }
  
      return components;
    };
  }
  
  function listStyle(property, compactable, validator) {
    var type = _wrapDefault('list-style-type', property, compactable);
    var position = _wrapDefault('list-style-position', property, compactable);
    var image = _wrapDefault('list-style-image', property, compactable);
    var components = [type, position, image];
  
    if (property.value.length == 1 && property.value[0][1] == 'inherit') {
      type.value = position.value = image.value = [property.value[0]];
      return components;
    }
  
    var values = property.value.slice(0);
    var total = values.length;
    var index = 0;
  
    // `image` first...
    for (index = 0, total = values.length; index < total; index++) {
      if (validator.isUrl(values[index][1]) || values[index][1] == '0') {
        image.value = [values[index]];
        values.splice(index, 1);
        break;
      }
    }
  
    // ... then `position`
    for (index = 0, total = values.length; index < total; index++) {
      if (validator.isListStylePositionKeyword(values[index][1])) {
        position.value = [values[index]];
        values.splice(index, 1);
        break;
      }
    }
  
    // ... and what's left is a `type`
    if (values.length > 0 && (validator.isListStyleTypeKeyword(values[0][1]) || validator.isIdentifier(values[0][1]))) {
      type.value = [values[0]];
    }
  
    return components;
  }
  
  function widthStyleColor(property, compactable, validator) {
    var descriptor = compactable[property.name];
    var components = [
      _wrapDefault(descriptor.components[0], property, compactable),
      _wrapDefault(descriptor.components[1], property, compactable),
      _wrapDefault(descriptor.components[2], property, compactable)
    ];
    var color, style, width;
  
    for (var i = 0; i < 3; i++) {
      var component = components[i];
  
      if (component.name.indexOf('color') > 0)
        color = component;
      else if (component.name.indexOf('style') > 0)
        style = component;
      else
        width = component;
    }
  
    if ((property.value.length == 1 && property.value[0][1] == 'inherit') ||
        (property.value.length == 3 && property.value[0][1] == 'inherit' && property.value[1][1] == 'inherit' && property.value[2][1] == 'inherit')) {
      color.value = style.value = width.value = [property.value[0]];
      return components;
    }
  
    var values = property.value.slice(0);
    var match, matches;
  
    // NOTE: usually users don't follow the required order of parts in this shorthand,
    // so we'll try to parse it caring as little about order as possible
  
    if (values.length > 0) {
      matches = values.filter(_widthFilter(validator));
      match = matches.length > 1 && (matches[0][1] == 'none' || matches[0][1] == 'auto') ? matches[1] : matches[0];
      if (match) {
        width.value = [match];
        values.splice(values.indexOf(match), 1);
      }
    }
  
    if (values.length > 0) {
      match = values.filter(_styleFilter(validator))[0];
      if (match) {
        style.value = [match];
        values.splice(values.indexOf(match), 1);
      }
    }
  
    if (values.length > 0) {
      match = values.filter(_colorFilter(validator))[0];
      if (match) {
        color.value = [match];
        values.splice(values.indexOf(match), 1);
      }
    }
  
    return components;
  }
  
  module.exports = {
    animation: animation,
    background: background,
    border: widthStyleColor,
    borderRadius: borderRadius,
    font: font,
    fourValues: fourValues,
    listStyle: listStyle,
    multiplex: multiplex,
    outline: widthStyleColor
  };
  