var AppDispatcher = require('../dispatcher/appDispatcher');
var EventEmitter = require('events').EventEmitter;
var CartConstants = require('../constants/cartConstants');
var CartActions = require('../actions/cartActions');
var NavigationActions = require('../actions/navigationActions');
var ItemInCart = require('../models/itemInCart');
var ItemInCartCollection = require('../models/itemInCartCollection');
var ItemCollection = require('../models/itemCollection');
var DeliveryDestination = require('../models/deliveryDestination');
var OrderConfirmation = require('../models/orderConfirmation');
var globals = require('../globals');
var Superagent = require('superagent');
var _ = require('underscore');

var states = {}
var initialized = false;

var _itemsInCart = new ItemInCartCollection();
var _itemsForDisplay = new ItemCollection();
_itemsForDisplay.setFromCart(true);
var _deliveryDestination = new DeliveryDestination();



var loadCart = function() {
    var get = function() {
        _itemsInCart.fetch({
            success: function() {
                states = {}
                for (var i = 0; i < _itemsInCart.models.length; i++) {
                    var itemInCart = _itemsInCart.models[i];
                    states[itemInCart.get('item_id')] = itemInCart;
                }
                //CartActions.dataLoaded();
                
                _itemsForDisplay.fetch({
                    success: function() {
                        //CartActions.dataLoaded();
        if (!_deliveryDestination.get('id')) {
            _deliveryDestination.fetch({
                success: function() {
                    CartActions.dataLoaded();
                }
            });
        } else {
            
                    CartActions.dataLoaded();
        }
                    }
                });

            }
        });

          };

    get();
    //if(initialized) {
        //get();
    //} else {
        //Superagent
            //.get(globals.ApiUrl + '/cart/init')
            //.withCredentials()
            //.end(function(response) {
                //if(response.ok) {
                    //initialized = true;
                    //get();
                //}
            //});
    //}
};


var saveCartStateForItem = function(itemId) {
    var item = CartStore.getStateFor(itemId);
    item.save({
        success: function() {
            CartActions.dataLoaded();
        }
    });
};

var addItem = function(itemId) {

    var state = states[itemId] || new ItemInCart({
        item_id: itemId,
        count: 0
    })
    state.set('count', state.get('count') + 1);
    states[itemId] = state;
    saveCartStateForItem(itemId);

};

var takeItemOut = function(itemId) {

    var state = states[itemId] || new ItemInCart({
        item_id: itemId,
        count: 0
    })
    if (state.get('count') > 0) {
        state.set('count', state.get('count') - 1);
    }
    states[itemId] = state;
    saveCartStateForItem(itemId);
};

var changeDeliveryDestinationProperty = function(property, value) {
    _deliveryDestination.set(property, value);
};


var confirmOrder = function () {
    console.log("confirming");
    var oc = new OrderConfirmation({ hamo: 'meho' });
    oc.save({b:'b'}, {
        success: function () {
            console.log("done");
            NavigationActions.goToThankYou();
        }
    });
};


var saveDeliveryDestination = function() {
    console.log("saving delivery destination");
    _deliveryDestination.save(null,{
        success: function() {
            console.log("saved delivery destination");
            confirmOrder();
        }
    })
};


// Extend CartStore with EventEmitter to add eventing capabilities
var CartStore = _.extend({}, EventEmitter.prototype, {

    getStateFor: function(itemId) {

        var state = states[itemId] || new ItemInCart({
            item_id: itemId,
            count: 0
        })
        return state
    },

    getWholeCartState: function() {

        var numberOfItems = 0;

        for (key in states) {
            if (states.hasOwnProperty(key)) {
                var value = states[key];
                if (value.get('count') > 0) {
                    numberOfItems += value.get('count');
                }
            }
        };

        var state = {
            count: numberOfItems,
            items: _itemsForDisplay,
            itemCounts: states,
            deliveryDestination: _deliveryDestination
        };
        return state;
    },

    // Emit Change event
    emitChange: function() {
        console.log("Emitting cart change!");
        this.emit('change');
    },

    // Add change listener
    addChangeListener: function(callback) {
        this.on('change', callback);
    },

    // Remove change listener
    removeChangeListener: function(callback) {
        this.removeListener('change', callback);
    }

});


// Register callback with AppDispatcher
AppDispatcher.register(function(payload) {
    var action = payload.action;
    var text;

    switch (action.actionType) {

        case CartConstants.LOAD_CART_CONTENTS:
            loadCart();
            break;

        case CartConstants.ADD_ITEM:
            addItem(action.itemId);
            break;

        case CartConstants.TAKE_ITEM_OUT:
            takeItemOut(action.itemId);
            break;
        case CartConstants.CART_DATA_LOADED:
            // do nothing - jsut emmit change
            break;
        case CartConstants.SAVE_CART_STATE_FOR_ITEM:
            saveCartStateForItem(action.itemId);
            break;
        case CartConstants.CHANGE_DELIVERY_DESTINATION_PROPERTY:
            changeDeliveryDestinationProperty(action.propertyName, action.value)
            break;
        case CartConstants.CONFIRM_DELIVERY:
            saveDeliveryDestination();
            break;
        default:
            return true;
    }

    // If action was responded to, emit change event
    CartStore.emitChange();
    return true;

});

module.exports = CartStore;