define(["appSettings", "pluginManager"], function(appSettings, pluginManager) {
    "use strict";

    function addPackage(packageManager, pkg) {
        packageManager.packagesList = packageManager.packagesList.filter(function(p) {
            return p.name !== pkg.name
        }), packageManager.packagesList.push(pkg)
    }

    function removeUrl(url) {
        var manifestUrls = JSON.parse(appSettings.get(settingsKey) || "[]");
        manifestUrls = manifestUrls.filter(function(i) {
            return i !== url
        }), appSettings.set(settingsKey, JSON.stringify(manifestUrls))
    }

    function loadPackage(packageManager, url, throwError) {
        return new Promise(function(resolve, reject) {
            var xhr = new XMLHttpRequest,
                originalUrl = url;
            url += -1 === url.indexOf("?") ? "?" : "&", url += "t=" + (new Date).getTime(), xhr.open("GET", url, !0);
            var onError = function() {
                !0 === throwError ? reject() : (removeUrl(originalUrl), resolve())
            };
            xhr.onload = function(e) {
                if (this.status < 400) {
                    var pkg = JSON.parse(this.response);
                    pkg.url = originalUrl, addPackage(packageManager, pkg);
                    var plugins = pkg.plugins || [];
                    pkg.plugin && plugins.push(pkg.plugin);
                    var promises = plugins.map(function(pluginUrl) {
                        return pluginManager.loadPlugin(packageManager.mapPath(pkg, pluginUrl))
                    });
                    Promise.all(promises).then(resolve, resolve)
                } else onError()
            }, xhr.onerror = onError, xhr.send()
        })
    }

    function PackageManager() {
        this.packagesList = []
    }
    var settingsKey = "installedpackages1";
    return PackageManager.prototype.init = function() {
        var manifestUrls = JSON.parse(appSettings.get(settingsKey) || "[]"),
            instance = this;
        return Promise.all(manifestUrls.map(function(u) {
            return loadPackage(instance, u)
        })).then(function() {
            return Promise.resolve()
        }, function() {
            return Promise.resolve()
        })
    }, PackageManager.prototype.packages = function() {
        return this.packagesList.slice(0)
    }, PackageManager.prototype.install = function(url) {
        return loadPackage(this, url, !0).then(function(pkg) {
            var manifestUrls = JSON.parse(appSettings.get(settingsKey) || "[]");
            return -1 === manifestUrls.indexOf(url) && (manifestUrls.push(url), appSettings.set(settingsKey, JSON.stringify(manifestUrls))), pkg
        })
    }, PackageManager.prototype.uninstall = function(name) {
        var pkg = this.packagesList.filter(function(p) {
            return p.name === name
        })[0];
        return pkg && (this.packagesList = this.packagesList.filter(function(p) {
            return p.name !== name
        }), removeUrl(pkg.url)), Promise.resolve()
    }, PackageManager.prototype.mapPath = function(pkg, pluginUrl) {
        var urlLower = pluginUrl.toLowerCase();
        if (0 === urlLower.indexOf("http:") || 0 === urlLower.indexOf("https:") || 0 === urlLower.indexOf("file:")) return pluginUrl;
        var packageUrl = pkg.url;
        return packageUrl = packageUrl.substring(0, packageUrl.lastIndexOf("/")), packageUrl += "/", packageUrl += pluginUrl
    }, new PackageManager
});