/* jshint expr: true */

var assert = chai.assert;
var expect = chai.expect;

import * as WebUtil from '../app/webutil.js';

import sinon from '../vendor/sinon.js';

describe('WebUtil', function() {
    "use strict";

    describe('settings', function () {

        // on Firefox, localStorage methods cannot be replaced
        // localStorage is (currently) mockable on Chrome
        // test to see if localStorage is mockable
        var mockTest = sinon.spy(window.localStorage, 'setItem');
        var canMock = window.localStorage.setItem.getCall instanceof Function;
        mockTest.restore();
        if (!canMock) {
            console.warn('localStorage cannot be mocked');
        }
        (canMock ? describe : describe.skip)('localStorage', function() {
            var chrome = window.chrome;
            before(function() {
                chrome = window.chrome;
                window.chrome = null;
            });
            after(function() {
                window.chrome = chrome;
            });

            var lsSandbox = sinon.createSandbox();

            beforeEach(function() {
                lsSandbox.stub(window.localStorage, 'setItem');
                lsSandbox.stub(window.localStorage, 'getItem');
                lsSandbox.stub(window.localStorage, 'removeItem');
                WebUtil.initSettings();
            });
            afterEach(function() {
                lsSandbox.restore();
            });

            describe('writeSetting', function() {
                it('should save the setting value to local storage', function() {
                    WebUtil.writeSetting('test', 'value');
                    expect(window.localStorage.setItem).to.have.been.calledWithExactly('test', 'value');
                    expect(WebUtil.readSetting('test')).to.equal('value');
                });
            });

            describe('setSetting', function() {
                it('should update the setting but not save to local storage', function() {
                    WebUtil.setSetting('test', 'value');
                    expect(window.localStorage.setItem).to.not.have.been.called;
                    expect(WebUtil.readSetting('test')).to.equal('value');
                });
            });

            describe('readSetting', function() {
                it('should read the setting value from local storage', function() {
                    localStorage.getItem.returns('value');
                    expect(WebUtil.readSetting('test')).to.equal('value');
                });

                it('should return the default value when not in local storage', function() {
                    expect(WebUtil.readSetting('test', 'default')).to.equal('default');
                });

                it('should return the cached value even if local storage changed', function() {
                    localStorage.getItem.returns('value');
                    expect(WebUtil.readSetting('test')).to.equal('value');
                    localStorage.getItem.returns('something else');
                    expect(WebUtil.readSetting('test')).to.equal('value');
                });

                it('should cache the value even if it is not initially in local storage', function() {
                    expect(WebUtil.readSetting('test')).to.be.null;
                    localStorage.getItem.returns('value');
                    expect(WebUtil.readSetting('test')).to.be.null;
                });

                it('should return the default value always if the first read was not in local storage', function() {
                    expect(WebUtil.readSetting('test', 'default')).to.equal('default');
                    localStorage.getItem.returns('value');
                    expect(WebUtil.readSetting('test', 'another default')).to.equal('another default');
                });

                it('should return the last local written value', function() {
                    localStorage.getItem.returns('value');
                    expect(WebUtil.readSetting('test')).to.equal('value');
                    WebUtil.writeSetting('test', 'something else');
                    expect(WebUtil.readSetting('test')).to.equal('something else');
                });
            });

            // this doesn't appear to be used anywhere
            describe('eraseSetting', function() {
                it('should remove the setting from local storage', function() {
                    WebUtil.eraseSetting('test');
                    expect(window.localStorage.removeItem).to.have.been.calledWithExactly('test');
                });
            });
        });

        describe('chrome.storage', function() {
            var chrome = window.chrome;
            var settings = {};
            before(function() {
                chrome = window.chrome;
                window.chrome = {
                    storage: {
                        sync: {
                            get: function(cb){ cb(settings); },
                            set: function(){},
                            remove: function() {}
                        }
                    }
                };
            });
            after(function() {
                window.chrome = chrome;
            });

            var csSandbox = sinon.createSandbox();

            beforeEach(function() {
                settings = {};
                csSandbox.spy(window.chrome.storage.sync, 'set');
                csSandbox.spy(window.chrome.storage.sync, 'remove');
                WebUtil.initSettings();
            });
            afterEach(function() {
                csSandbox.restore();
            });

            describe('writeSetting', function() {
                it('should save the setting value to chrome storage', function() {
                    WebUtil.writeSetting('test', 'value');
                    expect(window.chrome.storage.sync.set).to.have.been.calledWithExactly(sinon.match({ test: 'value' }));
                    expect(WebUtil.readSetting('test')).to.equal('value');
                });
            });

            describe('setSetting', function() {
                it('should update the setting but not save to chrome storage', function() {
                    WebUtil.setSetting('test', 'value');
                    expect(window.chrome.storage.sync.set).to.not.have.been.called;
                    expect(WebUtil.readSetting('test')).to.equal('value');
                });
            });

            describe('readSetting', function() {
                it('should read the setting value from chrome storage', function() {
                    settings.test = 'value';
                    expect(WebUtil.readSetting('test')).to.equal('value');
                });

                it('should return the default value when not in chrome storage', function() {
                    expect(WebUtil.readSetting('test', 'default')).to.equal('default');
                });

                it('should return the last local written value', function() {
                    settings.test = 'value';
                    expect(WebUtil.readSetting('test')).to.equal('value');
                    WebUtil.writeSetting('test', 'something else');
                    expect(WebUtil.readSetting('test')).to.equal('something else');
                });
            });

            // this doesn't appear to be used anywhere
            describe('eraseSetting', function() {
                it('should remove the setting from chrome storage', function() {
                    WebUtil.eraseSetting('test');
                    expect(window.chrome.storage.sync.remove).to.have.been.calledWithExactly('test');
                });
            });
        });
    });
});