text: var template = require('lodash.template');
  var decls =  require('./decls.json');
  
  /*
    Rules legend:
     - combined - if rule is combined it will be rendered with template
     - combined and basic rules are present in basic reset
     - combined, basic and inherited rules are present in full reset
  */
  
  function _getRulesMap(inputDecls) {
    return inputDecls
      .filter(function (decl) {
        return !decl.combined;
      })
      .reduce(function (map, decl) {
        map[decl.prop.replace(/\-/g, '')] = decl.initial;
        return map;
      }, {});
  }
  
  function _compileDecls(inputDecls) {
    var templateVars = _getRulesMap(inputDecls);
    return inputDecls.map(function (decl) {
      if (decl.combined && decl.initial) {
        var t = template(decl.initial.replace(/\-/g, ''));
        decl.initial = t(templateVars);
      }
      return decl;
    });
  }
  
  function _getRequirements(inputDecls) {
    return inputDecls.reduce(function (map, decl) {
      if (!decl.contains) return map;
      return decl.contains.reduce(function (mapInner, dependensy) {
        mapInner[dependensy] = decl;
        return mapInner;
      }, map);
    }, {});
  }
  
  function _expandContainments(inputDecls) {
    var requiredMap = _getRequirements(inputDecls);
    return inputDecls
    .filter(function (decl) {
      return !decl.contains;
    }).map(function (decl) {
      var dependensy = requiredMap[decl.prop];
      if (dependensy) {
        decl.requiredBy = dependensy.prop;
        decl.basic = decl.basic || dependensy.basic;
        decl.inherited = decl.inherited || dependensy.inherited;
      }
      return decl;
    });
  }
  
  var compiledDecls = _expandContainments(_compileDecls(decls));
  
  function _clearDecls(rules, value) {
    return rules.map(function (rule) {
      return {
        prop:  rule.prop,
        value: value.replace(/initial/g, rule.initial)
      };
    });
  }
  
  function _allDecls(onlyInherited) {
    return compiledDecls.filter(function (decl) {
      var allowed = decl.combined || decl.basic;
      if (onlyInherited) return allowed && decl.inherited;
      return allowed;
    });
  }
  
  function _concreteDecl(declName) {
    return compiledDecls.filter(function (decl) {
      return declName === decl.prop || declName === decl.requiredBy;
    });
  }
  
  function makeFallbackFunction(onlyInherited) {
    return function (declName, declValue) {
      var result;
      if (declName === 'all') {
        result = _allDecls(onlyInherited);
      } else {
        result = _concreteDecl(declName);
      }
      return _clearDecls(result, declValue);
    };
  }
  
  module.exports = makeFallbackFunction;
  