'use strict';

/* global angular */
/* global EventSource */

angular.module('Application').service('Client', function ($http, md5) {
    var client = null;

    function ClientError(statusCode, message) {
        Error.call(this);
        this.name = this.constructor.name;
        this.statusCode = statusCode;
        if (typeof message == 'string') {
            this.message = message;
        } else {
            this.message = JSON.stringify(message);
        }
    }

    function defaultErrorHandler(callback) {
        return function (data, status) {
            if (status === 401) return client.logout();
            callback(new ClientError(status, data));
        };
    }

    function Client() {
        this._ready = false;
        this._configListener = [];
        this._readyListener = [];
        this._userInfo = {
            username: null,
            email: null,
            admin: false
        };
        this._token = null;
        this._clientId = 'cid-webadmin';
        this._clientSecret = 'unused';
        this._config = {
            appServerUrl: null,
            fqdn: null,
            ip: null,
            revision: null,
            update: null,
            isDev: false
        };
        this._installedApps = [];

        this.setToken(localStorage.token);
    }

    Client.prototype.setReady = function () {
        if (this._ready) return;

        this._ready = true;
        this._readyListener.forEach(function (callback) {
            callback();
        });
    };

    Client.prototype.onReady = function (callback) {
        if (this._ready) callback();
        this._readyListener.push(callback);
    };

    Client.prototype.onConfig = function (callback) {
        this._configListener.push(callback);
        callback(this._config);
    };

    Client.prototype.setUserInfo = function (userInfo) {
        // In order to keep the angular bindings alive, set each property individually
        this._userInfo.username = userInfo.username;
        this._userInfo.email = userInfo.email;
        this._userInfo.admin = !!userInfo.admin;
        this._userInfo.gravatar = 'https://www.gravatar.com/avatar/' + md5.createHash(userInfo.email.toLowerCase()) + '.jpg?s=24&d=mm';
    };

    Client.prototype.setConfig = function (config) {
        // In order to keep the angular bindings alive, set each property individually
        this._config.appServerUrl = config.appServerUrl;
        this._config.version = config.version;
        this._config.fqdn = config.fqdn;
        this._config.ip = config.ip;
        this._config.revision = config.revision;
        this._config.update = config.update;
        this._config.isDev = config.isDev;

        var that = this;

        this._configListener.forEach(function (callback) {
            callback(that._config);
        });
    };

    Client.prototype.getInstalledApps = function () {
        return this._installedApps;
    };

    Client.prototype.getUserInfo = function () {
        return this._userInfo;
    };

    Client.prototype.getConfig = function () {
        return this._config;
    };

    Client.prototype.setToken = function (token) {
        $http.defaults.headers.common.Authorization = 'Bearer ' + token;
        if (!token) localStorage.removeItem('token');
        else localStorage.token = token;
        this._token = token;
    };

    /*
     * Rest API wrappers
     */
    Client.prototype.config = function (callback) {
        $http.get('/api/v1/config').success(function(data, status) {
            if (status !== 200) return callback(new ClientError(status, data));
            callback(null, data);
        }).error(defaultErrorHandler(callback));
    };

    Client.prototype.userInfo = function (callback) {
        $http.get('/api/v1/profile').success(function(data, status) {
            if (status !== 200) return callback(new ClientError(status, data));
            callback(null, data);
        }).error(defaultErrorHandler(callback));
    };

    Client.prototype.createVolume = function (name, password, callback) {
        var data = { password: password, name: name };
        $http.post('/api/v1/volume/create', data).success(function(data, status) {
            if (status !== 201) return callback(new ClientError(status, data));
            callback(null, data);
        }).error(defaultErrorHandler(callback));
    };

    Client.prototype.deleteVolume = function (name, password, callback) {
        var data = { password: password };
        $http.post('/api/v1/volume/' + name + '/delete', data).success(function(data, status) {
            if (status !== 200) return callback(new ClientError(status, data));
            callback(null, data);
        }).error(defaultErrorHandler(callback));
    };

    Client.prototype.mount = function (name, password, callback) {
        var data = { password: password };
        $http.post('/api/v1/volume/' + name + '/mount', data).success(function(data, status) {
            if (status !== 200) return callback(new ClientError(status, data));
            callback(null, data);
        }).error(defaultErrorHandler(callback));
    };

    Client.prototype.unmount = function (name, password, callback) {
        var data = { password: password };
        $http.post('/api/v1/volume/' + name + '/unmount', data).success(function(data, status) {
            if (status !== 200) return callback(new ClientError(status, data));
            callback(null, data);
        }).error(defaultErrorHandler(callback));
    };

    Client.prototype.isMounted = function (name, callback) {
        $http.get('/api/v1/volume/' + name + '/ismounted').success(function(data, status) {
            if (status !== 200) return callback(new ClientError(status, data));
            callback(null, data.mounted);
        }).error(defaultErrorHandler(callback));
    };

    Client.prototype.listVolumes = function (callback) {
        $http.get('/api/v1/volume/list').success(function(data, status) {
            if (status !== 200) return callback(new ClientError(status, data));
            callback(null, data.volumes);
        }).error(defaultErrorHandler(callback));
    };

    Client.prototype.addUserToVolume = function (username, volumeId, password, callback) {
        var data = { username: username, password: password };
        $http.post('/api/v1/volume/' + volumeId + '/users', data).success(function (data, status) {
            if (status !== 200) return callback(new ClientError(status, data));
            callback(null);
        }).error(defaultErrorHandler(callback));
    };

    Client.prototype.removeUserFromVolume = function (username, volumeId, password, callback) {
        var data = { headers: {password: password} };
        $http({ method: 'DELETE', url: '/api/v1/volume/' + volumeId + '/users/' + username, data: data, headers: { 'Content-Type': 'application/json' }}).success(function (data, status) {
            if (status !== 200) return callback(new ClientError(status, data));
            callback(null);
        }).error(defaultErrorHandler(callback));
    };

    Client.prototype.installApp = function (id, password, title, config, callback) {
        var that = this;
        var data = { appStoreId: id, password: password, location: config.location, portBindings: config.portBindings, restrictAccessTo: config.restrictAccessTo };
        $http.post('/api/v1/app/install', data).success(function (data, status) {
            if (status !== 200 || !data.id) return callback(new ClientError(status, data));

            // put new app with amended title in cache
            data.manifest = { title: title };
            that._installedApps.push(data);

            callback(null, data.id);
        }).error(defaultErrorHandler(callback));
    };

    Client.prototype.configureApp = function (id, password, config, callback) {
        var data = { appId: id, password: password, location: config.location, portBindings: config.portBindings, restrictAccessTo: config.restrictAccessTo };
        $http.post('/api/v1/app/' + id + '/configure', data).success(function (data, status) {
            if (status !== 200) return callback(new ClientError(status, data));
            callback(null);
        }).error(defaultErrorHandler(callback));
    };

    Client.prototype.updateApp = function (id, callback) {
        $http.post('/api/v1/app/' + id + '/update', { }).success(function (data, status) {
            if (status !== 200) return callback(new ClientError(status, data));
            callback(null);
        }).error(defaultErrorHandler(callback));
    };

    Client.prototype.startApp = function (id, callback) {
        var data = { };
        $http.post('/api/v1/app/' + id + '/start', data).success(function (data, status) {
            if (status !== 200) return callback(new ClientError(status, data));
            callback(null);
        }).error(defaultErrorHandler(callback));
    };

    Client.prototype.stopApp = function (id, callback) {
        var data = { };
        $http.post('/api/v1/app/' + id + '/stop', data).success(function (data, status) {
            if (status !== 200) return callback(new ClientError(status, data));
            callback(null);
        }).error(defaultErrorHandler(callback));
    };

    Client.prototype.version = function (callback) {
        $http.get('/api/v1/version').success(function(data, status) {
            if (status !== 200) return callback(new ClientError(status, data));
            callback(null, data);
        }).error(defaultErrorHandler(callback));
    };

    Client.prototype.isServerFirstTime = function (callback) {
        $http.get('/api/v1/firsttime').success(function(data, status) {
            if (status !== 200) return callback(new ClientError(status, data));
            callback(null, !data.activated);
        }).error(defaultErrorHandler(callback));
    };

    Client.prototype.getNakedDomain = function (callback) {
        $http.get('/api/v1/settings/naked_domain')
        .success(function (data, status) {
            if (status !== 200) return callback(new ClientError(status, data));
            callback(null, data.appid);
        }).error(defaultErrorHandler(callback));
    };

    Client.prototype.setNakedDomain = function (appid, callback) {
        $http.post('/api/v1/settings/naked_domain', { appid: appid || '' }).success(function (data, status) {
            if (status !== 200) return callback(new ClientError(status, data));
            callback(null);
        }).error(defaultErrorHandler(callback));
    };

    Client.prototype.getApps = function (callback) {
        $http.get('/api/v1/apps').success(function (data, status) {
            if (status !== 200) return callback(new ClientError(status, data));
            callback(null, data.apps);
        });
    };

    Client.prototype.getApp = function (appId, callback) {
        var appFound = null;
        this._installedApps.some(function (app) {
            if (app.id === appId) {
                appFound = app;
                return true;
            } else {
                return false;
            }
        });

        if (appFound) return callback(null, appFound);
        else return callback(new Error('App not found'));
    };

    Client.prototype.removeApp = function (appId, callback) {
        $http.post('/api/v1/app/' + appId + '/uninstall').success(function (data, status) {
            if (status !== 200) return callback(new ClientError(status, data));
            callback(null);
        }).error(defaultErrorHandler(callback));
    };

    Client.prototype.getAppLogStream = function (appId) {
        var source = new EventSource('/api/v1/app/' + appId + '/logstream');
        return source;
    };

    Client.prototype.getAppLogUrl = function (appId) {
        return '/api/v1/app/' + appId + '/logs?access_token=' + this._token;
    };

    Client.prototype.setAdmin = function (username, admin, callback) {
        var payload = {
            username: username,
            admin: admin
        };

        $http.post('/api/v1/users/' + username + '/admin', payload).success(function (data, status) {
            if (status !== 200) return callback(new ClientError(status, data));
            callback(null);
        }).error(defaultErrorHandler(callback));
    };

    Client.prototype.createAdmin = function (username, password, email, callback) {
        var payload = {
            username: username,
            password: password,
            email: email
        };

        var that = this;

        $http.post('/api/v1/createadmin', payload).success(function(data, status) {
            if (status !== 201) return callback(new ClientError(status, data));

            that.setToken(data.token);
            that.setUserInfo(data.userInfo);

            callback(null, data.activated);
        }).error(defaultErrorHandler(callback));
    };

    Client.prototype.listUsers = function (callback) {
        $http.get('/api/v1/users').success(function(data, status) {
            if (status !== 200) return callback(new ClientError(status, data));
            callback(null, data);
        }).error(defaultErrorHandler(callback));
    };

    Client.prototype.stats = function (callback) {
        $http.get('/api/v1/stats').success(function(data, status) {
            if (status !== 200) return callback(new ClientError(status, data));
            callback(null, data);
        }).error(defaultErrorHandler(callback));
    };

    Client.prototype.getOAuthClients = function (callback) {
        $http.get('/api/v1/oauth/clients').success(function(data, status) {
            if (status !== 200) return callback(new ClientError(status, data));
            callback(null, data.clients);
        }).error(defaultErrorHandler(callback));
    };

    Client.prototype.delTokensByClientId = function (id, callback) {
        $http.delete('/api/v1/oauth/clients/' + id + '/tokens').success(function(data, status) {
            if (status !== 200) return callback(new ClientError(status, data));
            callback(null, data);
        }).error(defaultErrorHandler(callback));
    };

    Client.prototype.update = function (callback) {
        $http.get('/api/v1/update').success(function(data, status) {
            if (status !== 200) return callback(new ClientError(status, data));
            callback(null, data);
        }).error(defaultErrorHandler(callback));
    };

    Client.prototype.reboot = function (callback) {
        $http.get('/api/v1/reboot').success(function(data, status) {
            if (status !== 200) return callback(new ClientError(status, data));
            callback(null, data);
        }).error(defaultErrorHandler(callback));
    };

    Client.prototype.backup = function (callback) {
        $http.post('/api/v1/backups').success(function(data, status) {
            if (status !== 200) return callback(new ClientError(status, data));
            callback(null, data);
        }).error(defaultErrorHandler(callback));
    };

    Client.prototype.graphs = function (targets, from, callback) {
        var config = {
            params: {
                target: targets,
                format: 'json',
                from: from
            }
        };

        $http.get('/api/v1/graphs', config).success(function (data, status) {
            if (status !== 200) return callback(new ClientError(status, data));
            callback(null, data);
        }).error(defaultErrorHandler(callback));
    };

    Client.prototype.createUser = function (username, password, email, callback) {
        var data = {
            username: username,
            password: password,
            email: email
        };

        $http.post('/api/v1/users', data).success(function(data, status) {
            if (status !== 201) return callback(new ClientError(status, data));
            callback(null, data);
        }).error(defaultErrorHandler(callback));
    };

    Client.prototype.removeUser = function (username, password, callback) {
        var data = {
            username: username,
            password: password
        };

        $http({ method: 'DELETE', url: '/api/v1/users/' + username, data: data, headers: { 'Content-Type': 'application/json' }}).success(function(data, status) {
            if (status !== 200) return callback(new ClientError(status, data));
            callback(null, data);
        }).error(defaultErrorHandler(callback));
    };

    Client.prototype.changePassword = function (currentPassword, newPassword, callback) {
        var data = {
            password: currentPassword,
            newPassword: newPassword
        };

        $http.post('/api/v1/users/' + this._userInfo.username + '/password', data).success(function(data, status) {
            if (status !== 200) return callback(new ClientError(status, data));
            callback(null, data);
        }).error(defaultErrorHandler(callback));
    };

    Client.prototype.refreshConfig = function (callback) {
        var that = this;

        callback = typeof callback === 'function' ? callback : function () {};

        this.config(function (error, result) {
            if (error) return callback(error);

            that.setConfig(result);
            callback(null);
        });
    };

    Client.prototype.refreshInstalledApps = function (callback) {
        var that = this;

        callback = typeof callback === 'function' ? callback : function () {};

        this.getApps(function (error, apps) {
            if (error) return callback(error);

            // insert or update new apps
            apps.forEach(function (app) {
                var found = false;

                for (var i = 0; i < that._installedApps.length; ++i) {
                    if (that._installedApps[i].id === app.id) {
                        found = i;
                        break;
                    }
                }

                if (found !== false) {
                    angular.copy(app, that._installedApps[found]);
                } else {
                    that._installedApps.push(app);
                }
            });

            // filter out old entries, going backwards to allow splicing
            for(var i = that._installedApps.length - 1; i >= 0; --i) {
                if (!apps.some(function (elem) { return (elem.id === that._installedApps[i].id); })) {
                    that._installedApps.splice(i, 1);
                }

            }

            callback(null);
        });
    };

    Client.prototype.logout = function () {
        this.setToken(null);
        this._userInfo = {};

        // logout from OAuth session
        window.location.href = '/api/v1/session/logout';
    };

    Client.prototype.exchangeCodeForToken = function (authCode, callback) {
        var data = {
            grant_type: 'authorization_code',
            code: authCode,
            redirect_uri: window.location.origin,
            client_id: this._clientId,
            client_secret: this._clientSecret
        };

        $http.post('/api/v1/oauth/token?response_type=token&client_id=' + this._clientId, data).success(function(data, status) {
            if (status !== 200) return callback(new ClientError(status, data));

            callback(null, data.access_token);
        }).error(defaultErrorHandler(callback));
    };

    client = new Client();
    return client;
});