var env = require('../env')
  , upgradeCouch = require('../config/upgrade-couchdb')
  , cryptoken = require('../util/crypto-token')
  , HTTPResult = require('../util/http-result')
  , _ = require('underscore')
  ;

var rewrites = {
    SurveyRun: function(doc) {
        rewriteDate(doc,'publicationDate');
        rewriteDate(doc,'startDate');
        rewriteDate(doc,'endDate');
        rewriteDoc(doc.survey);
        return doc;
    },
    Survey: function(doc) {
        rewriteDate(doc,'publicationDate');
        _.each(doc.questions,rewriteDoc);
        return doc;
    },
    Question: function(doc) {
        rewriteDate(doc,'publicationDate');
        return doc;
    },
    Response: function(doc) {
        rewriteDate(doc,'publicationDate');
        return doc;
    }
};

function rewriteDate(doc,field) {
    if ( field in doc ) {
        doc[field] = new Date(doc[field]).toISOString();
        return true;
    } else {
        return false;
    }
}

function rewriteDoc(doc) {
    if ( doc.type in rewrites ) {
        return rewrites[doc.type](doc);
    } else {
        return HTTPResult.fail();
    }
}

upgradeCouch(env.couchServerURL,env.dbName,rewriteDoc)
.then(function(res){
    console.log("done",res);
}, function(err){
    console.error("fail",err);
});