;(function () {
    function initWatch (vm, watch) {
        vm._watchers || (vm._watchers = []);
        for (var key in watch) {
            var handler = watch[key];
            if (BI.isArray(handler)) {
                for (var i = 0; i < handler.length; i++) {
                    vm._watchers.push(createWatcher(vm, key, handler[i]));
                }
            } else {
                vm._watchers.push(createWatcher(vm, key, handler));
            }
        }
    }

    function createWatcher (vm, keyOrFn, cb, options) {
        if (BI.isPlainObject(cb)) {
            options = cb;
            cb = cb.handler;
        }
        options = options || {};
        return Fix.watch(vm.model, keyOrFn, _.bind(cb, vm), BI.extend(options, {
            store: vm.store
        }));
    }

    var target = null;
    var targetStack = [];

    function pushTarget (_target) {
        if (target) targetStack.push(target);
        Fix.Model.target = target = _target;
    }

    function popTarget () {
        Fix.Model.target = target = targetStack.pop();
    }

    var oldWatch = Fix.watch;
    Fix.watch = function (model, expOrFn, cb, options) {
        if (BI.isPlainObject(cb)) {
            options = cb;
            cb = cb.handler;
        }
        if (typeof cb === "string") {
            cb = model[cb];
        }
        return oldWatch.call(this, model, expOrFn, function () {
            options && options.store && pushTarget(options.store);
            try {
                var res = cb.apply(this, arguments);
            } catch (e) {
                console.error(e);
            }
            options && options.store && popTarget();
            return res;
        }, options);
    };

    function findStore (widget) {
        if (target != null) {
            return target;
        }
        widget = widget || BI.Widget.context;
        var p = widget;
        while (p) {
            if (p instanceof Fix.Model || p.store || p.__cacheStore) {
                break;
            }
            p = p._parent || (p.options && p.options.element);
        }
        if (p) {
            if (p instanceof Fix.Model) {
                return widget.__cacheStore = p;
            }
            widget.__cacheStore = p.store || p.__cacheStore;
            return p.__cacheStore || p.store;
        }
    }

    // var _create = BI.createWidget;
    // BI.createWidget = function (item, options, context) {
    //     var pushed = false;
    //     if (BI.isWidget(options)) {
    //         pushContext(options);
    //         pushed = true;
    //     } else if (context != null) {
    //         pushContext(context);
    //         pushed = true;
    //     }
    //     var result = _create.apply(this, arguments);
    //     // try {
    //     //     var result = _create.apply(this, arguments);
    //     // } catch (e) {
    //     //     console.error(e);
    //     // }
    //     pushed && popContext();
    //     return result;
    // };

    BI.watch = function (watch, handler) {
        if (BI.Widget.current) {
            if (BI.isKey(watch)) {
                var key = watch;
                watch = {};
                watch[key] = handler;
            }
            for (var key in watch) {
                var handler = watch[key];
                if (BI.isArray(handler)) {
                    for (var i = 0; i < handler.length; i++) {
                        BI.Widget.current._watchers.push(createWatcher(BI.Widget.current, key, handler[i]));
                    }
                } else {
                    BI.Widget.current._watchers.push(createWatcher(BI.Widget.current, key, handler));
                }
            }
        }
    };

    _.each(["populate", "addItems", "prependItems"], function (name) {
        var old = BI.Loader.prototype[name];
        BI.Loader.prototype[name] = function () {
            BI.Widget.pushContext(this);
            try {
                var result = old.apply(this, arguments);
            } catch (e) {
                console.error(e);
            }
            BI.Widget.popContext();
            return result;
        };
    });

    function createStore () {
        var needPop = false;
        if (_global.Fix && this._store) {
            var store = findStore(this.options.context || this._parent || this.options.element || this._context);
            if (store) {
                pushTarget(store);
                needPop = true;
            }
            this.store = this._store();
            this.store && (this.store._widget = this);
            needPop && popTarget();
            needPop = false;
            pushTarget(this.store);
            if (this.store instanceof Fix.Model) {
                this.model = this.store.model;
            } else {
                this.model = this.store;
            }
            needPop = true;
        }
        return needPop;
    }

    var _init = BI.Widget.prototype._init;
    BI.Widget.prototype._init = function () {
        var self = this;
        var needPop = createStore.call(this);
        try {
            _init.apply(this, arguments);
        } catch (e) {
            console.error(e);
        }
        needPop && popTarget();
    };

    var _render = BI.Widget.prototype._render;
    BI.Widget.prototype._render = function () {
        var needPop = false;
        if (_global.Fix && this._store) {
            needPop = true;
            pushTarget(this.store);
            initWatch(this, this.watch);
        }
        _render.apply(this, arguments);
        // try {
        //     _render.apply(this, arguments);
        // } catch (e) {
        //     console.error(e);
        // }
        needPop && popTarget();
    };

    var unMount = BI.Widget.prototype.__d;
    BI.Widget.prototype.__d = function () {
        try {
            unMount.apply(this, arguments);
        } catch (e) {
            console.error(e);
        }
        this.store && BI.isFunction(this.store.destroy) && this.store.destroy();
        BI.each(this._watchers, function (i, unwatches) {
            unwatches = BI.isArray(unwatches) ? unwatches : [unwatches];
            BI.each(unwatches, function (j, unwatch) {
                unwatch();
            });
        });
        this._watchers && (this._watchers = []);
        if (this.store) {
            this.store._parent && (this.store._parent = null);
            this.store._widget && (this.store._widget = null);
            this.store = null;
        }
        delete this.__cacheStore;
    };

    _.each(["_mount"], function (name) {
        var old = BI.Widget.prototype[name];
        old && (BI.Widget.prototype[name] = function () {
            this.store && pushTarget(this.store);
            try {
                var res = old.apply(this, arguments);
            } catch (e) {
                console.error(e);
            }
            this.store && popTarget();
            return res;
        });
    });

    if (BI.isIE9Below && BI.isIE9Below()) {
        _.each(["each", "map", "reduce", "reduceRight", "find", "filter", "reject", "every", "all", "some", "any", "max", "min",
            "sortBy", "groupBy", "indexBy", "countBy", "partition",
            "keys", "allKeys", "values", "pairs", "invert",
            "mapObject", "findKey", "pick", "omit", "tap"], function (name) {
            var old = BI[name];
            BI[name] = function (obj, fn, context) {
                return typeof fn === "function" ? old(obj, function (key, value) {
                    if (!(key in Fix.$$skipArray)) {
                        return fn.apply(this, arguments);
                    }
                }, context) : old.apply(this, arguments);
            };
        });
        BI.isEmpty = function (ob) {
            if (BI.isPlainObject(ob) && ob.__ob__) {
                return BI.keys(ob).length === 0;
            }
            return _.isEmpty(ob);
        };
        BI.keys = function (ob) {
            var keys = _.keys(ob);
            var nKeys = [];
            for (var i = 0; i < keys.length; i++) {
                if (!(keys[i] in Fix.$$skipArray)) {
                    nKeys.push(keys[i]);
                }
            }
            return nKeys;
        };
        BI.values = function (ob) {
            var keys = BI.keys(obj);
            var length = keys.length;
            var values = [];
            for (var i = 0; i < length; i++) {
                values[i] = obj[keys[i]];
            }
            return values;
        };
        BI.extend = function () {
            var args = Array.prototype.slice.call(arguments);
            if (args.length < 1) {
                return {};
            }
            var object = args[0];
            var i = 1;
            while (i < args.length) {
                BI.each(args[i], function (key, v) {
                    object[key] = v;
                });
                i++;
            }
            return object;
        };
        BI.size = function (ob) {
            if (BI.isPlainObject(ob) && ob.__ob__) {
                return BI.keys(ob).length;
            }
            return _.size(ob);
        };
        BI.isEmptyObject = function (ob) {
            return BI.size(ob) === 0;
        };
        BI.deepClone = function (ob) {
            return Fix.toJSON(ob);
        };
    }
}());