window.evoapp.service('modelService', function ($rootScope, $http, $q, $timeout) {

    //http://wekeroad.com/2013/04/25/models-and-services-in-angular

    //maps the given record to the correct model. the result is the same record only with the model fields.
    function convert(modelName, record, action){

        var model = evoapp.models[modelName];

        if(model == undefined)
        {
            throw Error('Model ' + modelName + ' not found!');
        }

        var newData = {};

        for(n = 0; n < model.fields.length; n++)
        {
            var field = model.fields[n],
                name = field.name, 
                type = field.type;

            if(record[name] != null && record[name] != undefined)
            {
                var fieldValue = record[name];

                //convert from MS date to Date
                if(type == 'date' && field.dateFormat != undefined)
                {
                    if(field.dateFormat == 'MS')
                    {
                        if(action == null)
                        {
                            fieldValue = moment(fieldValue).toDate();

                            //remove client timezone offset
                            var offset = new Date(fieldValue).getTimezoneOffset() / 60;                            
                            fieldValue = moment(fieldValue).add('hours', offset).toDate();
                        }
                        else if(action == 'upsert')
                        {
                            //all dates going to server must be ISO8601
                            fieldValue = moment(fieldValue).format('YYYY-MM-DD');
                        }
                    }
                }

                if(type == 'datetime' && field.dateFormat != undefined)
                {
                    if(field.dateFormat == 'MS')
                    {
                        if(action == null)
                        {
                            fieldValue = moment(fieldValue).toDate();

                            //remove client timezone offset
                            var offset = new Date(fieldValue).getTimezoneOffset() / 60;                            
                            fieldValue = moment(fieldValue).add('hours', offset).toDate();
                        }
                        else if(action == 'upsert')
                        {
                            //all dates going to server must be ISO8601
                            fieldValue = moment(fieldValue).format('YYYY-MM-DD HH:mm');
                        }
                    }
                }              

                if(type == 'float' && fieldValue != null && fieldValue != undefined)
                {
                    var inan = isNaN(parseFloat(fieldValue));

                    if(!inan)
                    {
                        fieldValue = parseFloat(new String(fieldValue).replace(/,/, '.'));
                    }
                }

                if(type == 'int' && fieldValue != null && fieldValue != undefined)
                {
                    var inan = isNaN(parseInt(fieldValue));

                    if(!inan)
                    {
                        fieldValue = parseInt(fieldValue);
                    }
                }

                newData[name] = fieldValue;
            }
            else
            {
                newData[name] = null;
            }
        }

        return newData;
    };

    var toModel = function(model, record, action){

        return convert(model, record, action);
    };

    var collectionToModel = function(model, collection, action){

        var newCollection = [];

        if(collection != null)
        {
            $.each(collection, function(index, value) {

                var record = convert(model, value, action);

                newCollection.push(record);
            });
        }

        return newCollection;
    };

    return {
        toModel: toModel,
        collectionToModel: collectionToModel
    };

});