import {
    _,
    isArray,
    each,
    isKey,
    isPlainObject,
    extend,
    isFunction,
    Widget,
    Providers
} from "@/core";
import { Fix } from "./fix";

function initWatch(vm, watch) {
    vm._watchers || (vm._watchers = []);
    for (const key in watch) {
        const handler = watch[key];
        if (isArray(handler)) {
            for (let i = 0; i < handler.length; i++) {
                vm._watchers.push(createWatcher(vm, key, handler[i]));
            }
        } else {
            vm._watchers.push(createWatcher(vm, key, handler));
        }
    }
    each(vm.$watchDelayCallbacks, (i, watchDelayCallback) => {
        let innerWatch = watchDelayCallback[0];
        const innerHandler = watchDelayCallback[1];
        if (isKey(innerWatch)) {
            const key = innerWatch;
            innerWatch = {};
            innerWatch[key] = innerHandler;
        }
        for (const key in innerWatch) {
            const handler = innerWatch[key];
            if (isArray(handler)) {
                for (let 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 (isPlainObject(cb)) {
        options = cb;
        cb = cb.handler;
    }
    options = options || {};

    return Fix.watch(
        vm.model,
        keyOrFn,
        _.bind(cb, vm),
        extend(options, {
            store: vm.store
        })
    );
}

let target = null;
const targetStack = [];

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

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

export const Model = Fix.Model;

const oldWatch = Fix.watch;
Fix.watch = function (model, expOrFn, cb, options) {
    if (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);
            let res;
            try {
                res = cb.apply(this, arguments);
            } catch (e) {
                console.error(e);
            }
            options && options.store && popTarget();

            return res;
        },
        options
    );
};

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

        return p.__cacheStore || p.store;
    }
};

function createStore() {
    let needPop = false;
    const workerMode =
        Providers.getProvider("bi.provider.system").getWorkerMode();
    if (workerMode && this._worker) {
        return;
    }
    if (this.store) {
        pushTarget(this.store);

        return true;
    }
    if (this._store || this.options._store) {
        const store = Widget.findStore(
            this.options.context ||
                this._parent ||
                this.options.element ||
                this._context
        );
        if (store) {
            pushTarget(store);
            needPop = true;
        }
        this.store = (this._store || this.options._store).call(this);
        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;
}

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

const __initWatch = Widget.prototype.__initWatch;
Widget.prototype.__initWatch = function () {
    __initWatch.apply(this, arguments);
    const workerMode =
        Providers.getProvider("bi.provider.system").getWorkerMode();
    if (workerMode && this._worker) {
        return;
    }
    if (this._store) {
        initWatch(this, this.watch);
    }
};

const unMount = Widget.prototype.__destroy;
Widget.prototype.__destroy = function () {
    try {
        unMount.apply(this, arguments);
    } catch (e) {
        console.error(e);
    }
    this.store && isFunction(this.store.destroy) && this.store.destroy();
    each(this._watchers, (i, unwatches) => {
        unwatches = isArray(unwatches) ? unwatches : [unwatches];
        each(unwatches, (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(["_render", "__afterRender", "_mount", "__afterMount"], (name) => {
    const old = Widget.prototype[name];
    old &&
        (Widget.prototype[name] = function () {
            this.store && pushTarget(this.store);
            let res;
            try {
                res = old.apply(this, arguments);
            } catch (e) {
                console.error(e);
            }
            this.store && popTarget();

            return res;
        });
});