braterjs

var _ = Underscore.load();

function getCountyFactors(county) {
  var allCountyFactors = getTableByName('CountyFactors','Index');   
  var countyFactors = allCountyFactors.select({"County":county.toUpperCase()});
  var countyFactorsMap = {};
  _.each(countyFactors, function(countyFactor){ 
    countyFactorsMap[countyFactor.getFieldValue('Peril')] = countyFactor.getFieldValue('Factor');
  });
  return countyFactorsMap;
}

function getDeductibleFactors(deductible){
  var allDeductibleFactors = getTableByName('DeductibleFactors','Index');
  var deductibleFactors = allDeductibleFactors.select({"Deductible":deductible});
  var deductibleFactorsMap = {};
  _.each(deductibleFactors, function(deductibleFactor){
    deductibleFactorsMap[deductibleFactor.getFieldValue('Peril')] = deductibleFactor.getFieldValue('Factor');
  });
  return deductibleFactorsMap;
}

function getDPBaseDwellingFire(fields){
  var factors = getTableByName('DPDwellingFireFactors','Index');  
  var queryFields = _.pick(fields,'ProtectionClass','Families','Occupancy','Construction',"Limit");
  return getDPBase(factors, queryFields);
}

function getDPBaseContentsFire(fields){
  var factors = getTableByName('DPContentsFireFactors','Index');  
  var queryFields = _.pick(fields,'ProtectionClass','Construction',"Limit");
  return getDPBase(factors, queryFields);
}

function getDPBase(factors, queryFields){
  var baseExcess = getBaseExcessLimits(queryFields["Limit"]);
  queryFields["Limit"] = baseExcess["base"];
  var totalBase = factors.select(queryFields).first().getFieldValue('Factor');
  if(baseExcess["excess"] > 0){
    queryFields["Limit"] = 100;
    var excessFactor = factors.select(queryFields).first().getFieldValue('Factor');
    var excessRate = baseExcess["excess"] / 100.0 * excessFactor;
    totalBase += excessRate;
  }
  return totalBase;
}

function getBaseExcessLimits(limit){
  return {"base": Math.min(limit,50000), "excess": Math.max(0,limit-50000)};
}

function calculateDPRates(quote){
  _.each(quote["Items"], function(item){
    var ratingFields = _.omit(quote,"Items");
    ratingFields["Limit"] = item["Limit"];
    ratingFields["Coverage"] = item["Item"]
    item["firePremium"] = calculateDPFire(ratingFields,item);
    var allied = calculateDPAllied(ratingFields);
    item["ecPremium"] = allied["EC"];
    item["otherPremium"] = allied["Other"];
  });
 return quote; 
}

function calculateDPFire(ratingFields, item){
  var dpBaseFireFunction = getBaseFireFunction(item);
  var base = dpBaseFireFunction(ratingFields);
  return applyFactorsToBase(base, ratingFields, "Fire");
}

function calculateDPAllied(ratingFields){
  var base = getDPBaseAllied(ratingFields);
  var allied = {"EC": 0, "Other":0};
  allied["EC"] = applyFactorsToBase(base["EC"], ratingFields, "EC");
  allied["Other"] = base["Other"] * getDeductibleFactors(ratingFields["Deductible"])["EC"];
  return allied;
}

function applyFactorsToBase(base, ratingFields, peril){
  ratingFields["Peril"] = peril;
  var countyFactor = getCountyFactors(ratingFields['County'])[peril];
  var deductibleFactor = getDeductibleFactors(ratingFields['Deductible'])[peril];
  return base * countyFactor * deductibleFactor;
}

function getBaseFireFunction(item){
  var fireFunctions = {"Dwelling" : getDPBaseDwellingFire,
                       "Contents" : getDPBaseContentsFire };
  return fireFunctions[item["Item"]];
}

function getDPBaseAllied(fields){
  var factors = getTableByName('DPECFactors','Index');
  var queryFields = _.pick(fields,"Zone","Limit","Coverage");
  var alliedBase = {"EC": 0, "Other": 0};  
  queryFields["Line"] = "Basic";
  var ec = getDPBase(factors, queryFields);
  if(fields["Line"] != "Basic"){
    queryFields["Line"] = fields["Line"];
    var broadSpecial = getDPBase(factors, queryFields);
    alliedBase["Other"] = broadSpecial - ec;
  }
  alliedBase["EC"] = ec;
  return alliedBase;
}