Ext.define('saas.model.Session', {
    extend: 'Ext.data.Model',

    fields: [
        { name: 'token', type: 'string' },
        { name: 'expire', type: 'number' },
        { name: 'timestamp', type: 'number' },
        { name: 'span', type: 'number' },
        { name: 'account' }
    ],

    statics: {
        login: function(username, password, companyId) {
            let params = {
                username: username,
                password: password
            };
            if(companyId) {
                params.companyId = companyId;
            }
            return new Ext.Promise(function (resolve, reject) {
				Ext.Ajax.request({
                    url: '/api/auth/authorize',
                    params: params,
                    method: 'POST',
                    success: function (response) {
                        var res = Ext.decode(response.responseText);
                        if (res.success) {
                            var session = saas.model.Session.loadData(res.data.token);
                            session.set('account', res.data.account);
                            // 服务端与本地存在时间差
                            session.set('span', session.get('timestamp') - new Date().getTime());
                            if (!session.isValid()) {
                                reject({
                                    message: '登录失败，无效身份令牌'
                                });
                            } else {
                                resolve(session);
                            }
                        } else {
                            Ext.log.error('request failure with code: ', res.code, ', message: ', res.message);
                            reject(res);
                        }
                    },
                    failure: function (response) {
                        Ext.log.error('server-side failure with status code: ', response.status);
                        reject(response);
                    }
                });
            });
        },
        switchCompany: function(oldSession, companyId) {
            return new Ext.Promise(function (resolve, reject) {
				Ext.Ajax.request({
                    url: '/api/auth/switch/company',
                    params: {
                        companyId: companyId
                    },
                    method: 'GET',
                    headers: {
                        'Authorization': oldSession.get('token')
                    },
                    success: function (response) {
                        var res = Ext.decode(response.responseText);
                        if (res.success) {
                            var newSession = saas.model.Session.loadData(res.data);
                            newSession.set('account', oldSession.get('account'));
                            // 服务端与本地存在时间差
                            newSession.set('span', newSession.get('timestamp') - new Date().getTime());
                            if (!newSession.isValid()) {
                                reject({
                                    message: '切换失败，无效身份令牌'
                                });
                            } else {
                                resolve(newSession);
                            }
                        } else {
                            Ext.log.error('request failure with code: ', res.code, ', message: ', res.message);
                            reject(res);
                        }
                    },
                    failure: function (response) {
                        Ext.log.error('server-side failure with status code: ', response.status);
                        reject(response);
                    }
                });
            });            
        }
    },

    isValid: function() {
        return !Ext.isEmpty(this.get('token')) && this.get('token').length > 128
            && this.get('timestamp') + this.get('expire') * 1000 > new Date().getTime() + this.get('span');
    },
    
    logout: function() {
        return new Ext.Promise(function (resolve, reject) {
            resolve({});
        });
    }
});