zupit.service('Zupit.Core.PersistenceService', ['$state','$stateParams',
    function ($state,$stateParams) {
        var ret= {
            states: {},
            set:function(name, val) {
                this.states[name] = val;
            },
            get:function(name) {
                return this.states[name];
            },
            exist:function(name) {
                return this.get(name) !== undefined;
            },
            getStateName:function(state,params) {
                return state.name + JSON.stringify(params);
            },
            saveState: function (data,state, params) {
                state = state || $state.current;
                params = params || $stateParams;
                this.states[this.getStateName(state,params)] = {
                    scroll: $(window).scrollTop(),
                    state: data
                };
            },
            removeState: function (state, params) {
                if (this.states[this.getStateName(state, params)]!==undefined)
                    delete this.states[this.getStateName(state, params)];
            },
            loadState: function (state, params) {
                state = state || $state.current;
                params = params || $stateParams;
                if (this.states[this.getStateName(state, params)] === undefined)
                    return null;
                var ret = this.states[this.getStateName(state, params)];
                $(window).scrollTop(ret.scroll);
                return ret.state;
            },
            hasState:function(state, params) {
                return this.loadState(state, params) !== null;
            },
            saveOnStorage: function () {
                sessionStorage.setItem('PersistenceService', JSON.stringify(this.states));
            },
            loadFromStorage: function () {
                var item = sessionStorage.getItem('PersistenceService');
                if (item !== undefined && item !== null)
                    this.states = JSON.parse(item);
            }
           
        }
        ret.loadFromStorage();
        return ret;
    }
]);