define(function () {
    'use strict';

    function Steps() { 
    }

    Steps.prototype = {
        transferToVM: function (dm) {
            var current = -1, getStatus = function(condition){
                try{
                    var regex = new RegExp("(\\w+\\s*)=(\\s*\\w+)"), m;
                    while((m = regex.exec(condition)) != null) {
                        condition = condition.replace(m[0], m[1]+"=="+m[2]);
                    }
                    return eval(condition);
                }catch(e){
                    return false;
                }
            };
            dm.steps.forEach(function(step, i){
                if(getStatus(decodeURIComponent(step.condition)) === true) current = i;
            });
            return {
                direction: dm.direction,
                steps: dm.steps.map(function(step, i){
                    return {
                        title: step.title,
                        desc: step.desc,
                        status: current == i ? "current" : (current > i ? "finish" : "wait")
                    }
                })
            };
        }
    };

    return Steps;
});