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var _ = require("lodash");

/**
 * @constructor
 */
var EasyExtender = function (plugins, hooks) {

    this.plugins        = {};
    this.pluginOptions  = {};
    this.returnValues   = {};

    this.hooks          = hooks;
    this.defaultPlugins = plugins;

    return this;
};

/**
 * @returns {EasyExtender}
 */
EasyExtender.prototype.init = function () {

    if (this.defaultPlugins) {
        var required = Object.keys(this.defaultPlugins);
        required.forEach(function (name) {
            if (_.isUndefined(this.plugins[name])) {
                this.plugins[name] = this.defaultPlugins[name];
            }
        }, this);
    }

    return this;
};

/**
 * Call the '.plugin()' method of all registered plugins
 */
EasyExtender.prototype.initUserPlugins = function () {

    var args = _.toArray(arguments);

    var userPlugins = _.difference(Object.keys(this.plugins), Object.keys(this.defaultPlugins));

    if (userPlugins.length) {

        userPlugins.forEach(function (plugin) {

            var pluginOptions = {};

            if (this.pluginOptions) {
                pluginOptions = this.pluginOptions[plugin];
            }

            this.returnValues[plugin].push({
                value: this.get(plugin).apply(null, [pluginOptions].concat(args))
            });

            if (!_.isUndefined(pluginOptions) && !_.isUndefined(pluginOptions.enabled)) {
                if (pluginOptions.enabled) {
                    this.enablePlugin(plugin);
                } else {
                    this.disablePlugin(plugin);
                }
            } else {
                this.enablePlugin(plugin);
            }

        }, this);
    }
};

/**
 * Wrap a module in East Extender pattern
 * @param module
 * @param localName
 */
EasyExtender.prototype.wrap = function (module, localName) {
    this.registerPlugin({
        "plugin:name": localName,
        "plugin": function () {
            return module;
        }
    });
};

/**
 * @param {String} name
 * @returns {Function|Boolean}
 */
EasyExtender.prototype.get = function (name) {

    if (!_.isUndefined(this.plugins[name])) {
        return this.plugins[name].plugin || false;
    }

    return false;
};

/**
 * @param {Object} module
 * @param {Object} [opts]
 * @param {Function} [cb]
 */
EasyExtender.prototype.registerPlugin = function (module, opts, cb) {

    var pluginOptions;

    if (!_.isFunction(module.plugin)) {
        return _.isFunction(cb) ? cb("Module must implement a .plugin() method") : false;
    }

    if (!cb && opts) {
        if (_.isFunction(opts)) {
            cb = opts;
        } else {
            pluginOptions = opts;
        }
    }

    var name = _.isUndefined(module["plugin:name"]) ? _.uniqueId() : module["plugin:name"];

    this.pluginOptions[name] = pluginOptions;
    this.returnValues[name]  = [];

    this.plugins[name] = module;

    if (_.isFunction(cb)) {
        cb(null);
    }

    this.disablePlugin(name);

    return this;
};

/**
 *
 * @param name
 */
EasyExtender.prototype.getPlugin = function (module) {

    if (_.isString(module)) {
        module = this.plugins[module];
    }

    if (!module) {
        return false;
    }

    return module;
};

/**
 *
 * @param name
 */
EasyExtender.prototype.disablePlugin = function (module) {

    module = this.getPlugin(module);
    module._enabled = false;

    return module;
};

/**
 * @param name
 */
EasyExtender.prototype.enablePlugin = function (module) {

    module = this.getPlugin(module);
    module._enabled = true;

    return module;
};

/**
 * @param name
 * @returns {*}
 */
EasyExtender.prototype.hook = function (name) {

    // Get any extra args
    var args  = Array.prototype.slice.call(arguments, 1);

    // build a list of hook funcs
    var funcs = [];

    _.each(this.plugins, function (plugin) {
        if (plugin.hooks) {
            if (!_.isUndefined(plugin.hooks[name])) {
                funcs.push(plugin.hooks[name]);
            }
        }
    });

    return this.hooks[name].apply(this, [funcs].concat(args));
};

/**
 * @param name
 * @returns {*}
 */
EasyExtender.prototype.getReturnValues = function (name) {
    return this.returnValues[name] || [];
};

module.exports = EasyExtender;