var path         = require('path'),
    EventEmitter = require('events').EventEmitter,
    should       = require('should'),
    sinon        = require('sinon'),
    _            = require('lodash'),
    Promise      = require('bluebird'),
    helpers      = require('../../server/helpers'),
    filters      = require('../../server/filters'),
    i18n         = require('../../server/i18n'),

    // Stuff we are testing
    AppProxy        = require('../../server/apps/proxy'),
    AppSandbox      = require('../../server/apps/sandbox'),
    AppDependencies = require('../../server/apps/dependencies'),
    AppPermissions  = require('../../server/apps/permissions');
i18n.init();

describe('Apps', function () {
    var sandbox,
        fakeApi;

    beforeEach(function () {
        sandbox = sinon.sandbox.create();

        fakeApi = {
            posts: {
                browse: sandbox.stub(),
                read: sandbox.stub(),
                edit: sandbox.stub(),
                add: sandbox.stub(),
                destroy: sandbox.stub()
            },
            users: {
                browse: sandbox.stub(),
                read: sandbox.stub(),
                edit: sandbox.stub()
            },
            tags: {
                all: sandbox.stub()
            },
            notifications: {
                destroy: sandbox.stub(),
                add: sandbox.stub()
            },
            settings: {
                browse: sandbox.stub(),
                read: sandbox.stub(),
                add: sandbox.stub()
            }
        };
    });

    afterEach(function () {
        sandbox.restore();
    });

    describe('Proxy', function () {
        it('requires a name to be passed', function () {
            function makeWithoutName() {
                return new AppProxy({});
            }

            makeWithoutName.should.throw('Must provide an app name for api context');
        });

        it('requires permissions to be passed', function () {
            function makeWithoutPerms() {
                return new AppProxy({
                    name: 'NoPerms'
                });
            }

            makeWithoutPerms.should.throw('Must provide app permissions');
        });

        it('creates a ghost proxy', function () {
            var appProxy = new AppProxy({
                name: 'TestApp',
                permissions: {
                    filters: ['prePostRender'],
                    helpers: ['myTestHelper'],
                    posts: ['browse', 'read', 'edit', 'add', 'delete']
                }
            });

            should.exist(appProxy.filters);
            should.exist(appProxy.filters.register);
            should.exist(appProxy.filters.deregister);

            should.exist(appProxy.helpers);
            should.exist(appProxy.helpers.register);
            should.exist(appProxy.helpers.registerAsync);

            should.exist(appProxy.api);

            should.exist(appProxy.api.posts);
            should.exist(appProxy.api.posts.browse);
            should.exist(appProxy.api.posts.read);
            should.exist(appProxy.api.posts.edit);
            should.exist(appProxy.api.posts.add);
            should.exist(appProxy.api.posts.destroy);

            should.not.exist(appProxy.api.users);

            should.exist(appProxy.api.tags);
            should.exist(appProxy.api.tags.browse);

            should.exist(appProxy.api.notifications);
            should.exist(appProxy.api.notifications.browse);
            should.exist(appProxy.api.notifications.add);
            should.exist(appProxy.api.notifications.destroy);

            should.exist(appProxy.api.settings);
            should.exist(appProxy.api.settings.browse);
            should.exist(appProxy.api.settings.read);
            should.exist(appProxy.api.settings.edit);
        });

        it('allows filter registration with permission', function (done) {
            var registerSpy = sandbox.spy(filters, 'registerFilter'),
                appProxy = new AppProxy({
                    name: 'TestApp',
                    permissions: {
                        filters: ['testFilter'],
                        helpers: ['myTestHelper'],
                        posts: ['browse', 'read', 'edit', 'add', 'delete']
                    }
                }),
                fakePosts = [{id: 0}, {id: 1}],
                filterStub = sandbox.spy(function (val) {
                    return val;
                });

            appProxy.filters.register('testFilter', 5, filterStub);

            registerSpy.called.should.equal(true);

            filterStub.called.should.equal(false);

            filters.doFilter('testFilter', fakePosts)
                .then(function () {
                    filterStub.called.should.equal(true);
                    appProxy.filters.deregister('testFilter', 5, filterStub);
                    done();
                })
                .catch(done);
        });

        it('does not allow filter registration without permission', function () {
            var registerSpy = sandbox.spy(filters, 'registerFilter'),
                appProxy = new AppProxy({
                    name: 'TestApp',
                    permissions: {
                        filters: ['prePostRender'],
                        helpers: ['myTestHelper'],
                        posts: ['browse', 'read', 'edit', 'add', 'delete']
                    }
                }),
                filterStub = sandbox.stub().returns('test result');

            function registerFilterWithoutPermission() {
                appProxy.filters.register('superSecretFilter', 5, filterStub);
            }

            registerFilterWithoutPermission.should.throw('The App "TestApp" attempted to perform an action or access' +
                ' a resource (filters.superSecretFilter) without permission.');

            registerSpy.called.should.equal(false);
        });

        it('allows filter deregistration with permission', function (done) {
            var registerSpy = sandbox.spy(filters, 'deregisterFilter'),
                appProxy = new AppProxy({
                    name: 'TestApp',
                    permissions: {
                        filters: ['prePostsRender'],
                        helpers: ['myTestHelper'],
                        posts: ['browse', 'read', 'edit', 'add', 'delete']
                    }
                }),
                fakePosts = [{id: 0}, {id: 1}],
                filterStub = sandbox.stub().returns(fakePosts);

            appProxy.filters.deregister('prePostsRender', 5, filterStub);

            registerSpy.called.should.equal(true);

            filterStub.called.should.equal(false);

            filters.doFilter('prePostsRender', fakePosts)
                .then(function () {
                    filterStub.called.should.equal(false);
                    done();
                })
                .catch(done);
        });

        it('does not allow filter deregistration without permission', function () {
            var registerSpy = sandbox.spy(filters, 'deregisterFilter'),
                appProxy = new AppProxy({
                    name: 'TestApp',
                    permissions: {
                        filters: ['prePostRender'],
                        helpers: ['myTestHelper'],
                        posts: ['browse', 'read', 'edit', 'add', 'delete']
                    }
                }),
                filterStub = sandbox.stub().returns('test result');

            function deregisterFilterWithoutPermission() {
                appProxy.filters.deregister('superSecretFilter', 5, filterStub);
            }

            deregisterFilterWithoutPermission.should.throw('The App "TestApp" attempted to perform an action or ' +
                'access a resource (filters.superSecretFilter) without permission.');

            registerSpy.called.should.equal(false);
        });

        it('allows helper registration with permission', function () {
            var registerSpy = sandbox.spy(helpers, 'registerThemeHelper'),
                appProxy = new AppProxy({
                    name: 'TestApp',
                    permissions: {
                        filters: ['prePostRender'],
                        helpers: ['myTestHelper'],
                        posts: ['browse', 'read', 'edit', 'add', 'delete']
                    }
                });

            appProxy.helpers.register('myTestHelper', sandbox.stub().returns('test result'));

            registerSpy.called.should.equal(true);
        });

        it('does not allow helper registration without permission', function () {
            var registerSpy = sandbox.spy(helpers, 'registerThemeHelper'),
                appProxy = new AppProxy({
                    name: 'TestApp',
                    permissions: {
                        filters: ['prePostRender'],
                        helpers: ['myTestHelper'],
                        posts: ['browse', 'read', 'edit', 'add', 'delete']
                    }
                });

            function registerWithoutPermissions() {
                appProxy.helpers.register('otherHelper', sandbox.stub().returns('test result'));
            }

            registerWithoutPermissions.should.throw('The App "TestApp" attempted to perform an action or access a ' +
                'resource (helpers.otherHelper) without permission.');

            registerSpy.called.should.equal(false);
        });

        it('does allow INTERNAL app to register helper without permission', function () {
            var registerSpy = sandbox.spy(helpers, 'registerThemeHelper'),
                appProxy = new AppProxy({
                    name: 'TestApp',
                    permissions: {},
                    internal: true
                });

            function registerWithoutPermissions() {
                appProxy.helpers.register('otherHelper', sandbox.stub().returns('test result'));
            }

            registerWithoutPermissions.should.not.throw('The App "TestApp" attempted to perform an action or access a ' +
                'resource (helpers.otherHelper) without permission.');

            registerSpy.called.should.equal(true);
        });
    });

    describe('Sandbox', function () {
        it('loads apps in a sandbox', function () {
            var appBox = new AppSandbox(),
                appPath = path.resolve(__dirname, '..', 'utils', 'fixtures', 'app', 'good.js'),
                GoodApp,
                appProxy = new AppProxy({
                    name: 'TestApp',
                    permissions: {}
                }),
                app;

            GoodApp = appBox.loadApp(appPath);

            should.exist(GoodApp);

            app = new GoodApp(appProxy);

            app.install(appProxy);

            app.app.something.should.equal(42);
            app.app.util.util().should.equal(42);
            app.app.nested.other.should.equal(42);
            app.app.path.should.equal(appPath);
        });

        it('does not allow apps to require blacklisted modules at top level', function () {
            var appBox = new AppSandbox(),
                badAppPath = path.join(__dirname, '..', 'utils', 'fixtures', 'app', 'badtop.js'),
                loadApp = function () {
                    appBox.loadApp(badAppPath);
                };

            loadApp.should.throw('Unsafe App require: knex');
        });

        it('does not allow apps to require blacklisted modules at install', function () {
            var appBox = new AppSandbox(),
                badAppPath = path.join(__dirname, '..', 'utils', 'fixtures', 'app', 'badinstall.js'),
                BadApp,
                appProxy = new AppProxy({
                    name: 'TestApp',
                    permissions: {}
                }),
                app,
                installApp = function () {
                    app.install(appProxy);
                };

            BadApp = appBox.loadApp(badAppPath);

            app = new BadApp(appProxy);

            installApp.should.throw('Unsafe App require: knex');
        });

        it('does not allow apps to require blacklisted modules from other requires', function () {
            var appBox = new AppSandbox(),
                badAppPath = path.join(__dirname, '..', 'utils', 'fixtures', 'app', 'badrequire.js'),
                BadApp,
                loadApp = function () {
                    BadApp = appBox.loadApp(badAppPath);
                };

            loadApp.should.throw('Unsafe App require: knex');
        });

        it('does not allow apps to require modules relatively outside their directory', function () {
            var appBox = new AppSandbox(),
                badAppPath = path.join(__dirname, '..', 'utils', 'fixtures', 'app', 'badoutside.js'),
                BadApp,
                loadApp = function () {
                    BadApp = appBox.loadApp(badAppPath);
                };

            loadApp.should.throw(/^Unsafe App require[\w\W]*example$/);
        });

        it('does allow INTERNAL apps to require modules relatively outside their directory', function () {
            var appBox = new AppSandbox({internal: true}),
                badAppPath = path.join(__dirname, '..', 'utils', 'fixtures', 'app', 'badoutside.js'),
                InternalApp,
                loadApp = function () {
                    InternalApp = appBox.loadApp(badAppPath);
                };

            InternalApp = appBox.loadApp(badAppPath);

            loadApp.should.not.throw(/^Unsafe App require[\w\W]*example$/);

            InternalApp.should.be.a.Function();
        });
    });

    describe('Dependencies', function () {
        it('can install by package.json', function (done) {
            var deps = new AppDependencies(process.cwd()),
                fakeEmitter = new EventEmitter();

            deps.spawnCommand = sandbox.stub().returns(fakeEmitter);

            deps.install().then(function () {
                deps.spawnCommand.calledWith('npm').should.equal(true);
                done();
            }).catch(done);

            _.delay(function () {
                fakeEmitter.emit('exit');
            }, 30);
        });
        it('does not install when no package.json', function (done) {
            var deps = new AppDependencies(__dirname),
                fakeEmitter = new EventEmitter();

            deps.spawnCommand = sandbox.stub().returns(fakeEmitter);

            deps.install().then(function () {
                deps.spawnCommand.called.should.equal(false);
                done();
            }).catch(done);

            _.defer(function () {
                fakeEmitter.emit('exit');
            });
        });
    });

    describe('Permissions', function () {
        var noGhostPackageJson = {
                name: 'myapp',
                version: '0.0.1',
                description: 'My example app',
                main: 'index.js',
                scripts: {
                    test: 'echo \'Error: no test specified\' && exit 1'
                },
                author: 'Ghost',
                license: 'MIT',
                dependencies: {
                    'ghost-app': '0.0.1'
                }
            },
            validGhostPackageJson = {
                name: 'myapp',
                version: '0.0.1',
                description: 'My example app',
                main: 'index.js',
                scripts: {
                    test: 'echo \'Error: no test specified\' && exit 1'
                },
                author: 'Ghost',
                license: 'MIT',
                dependencies: {
                    'ghost-app': '0.0.1'
                },
                ghost: {
                    permissions: {
                        posts: ['browse', 'read', 'edit', 'add', 'delete'],
                        users: ['browse', 'read', 'edit', 'add', 'delete'],
                        settings: ['browse', 'read', 'edit', 'add', 'delete']
                    }
                }
            };

        it('has default permissions to read and browse posts', function () {
            should.exist(AppPermissions.DefaultPermissions);

            should.exist(AppPermissions.DefaultPermissions.posts);

            AppPermissions.DefaultPermissions.posts.should.containEql('browse');
            AppPermissions.DefaultPermissions.posts.should.containEql('read');

            // Make it hurt to add more so additional checks are added here
            _.keys(AppPermissions.DefaultPermissions).length.should.equal(1);
        });
        it('uses default permissions if no package.json', function (done) {
            var perms = new AppPermissions('test');

            // No package.json in this directory
            sandbox.stub(perms, 'checkPackageContentsExists').returns(Promise.resolve(false));

            perms.read().then(function (readPerms) {
                should.exist(readPerms);

                readPerms.should.equal(AppPermissions.DefaultPermissions);

                done();
            }).catch(done);
        });
        it('uses default permissions if no ghost object in package.json', function (done) {
            var perms = new AppPermissions('test'),
                noGhostPackageJsonContents = JSON.stringify(noGhostPackageJson, null, 2);

            // package.json IS in this directory
            sandbox.stub(perms, 'checkPackageContentsExists').returns(Promise.resolve(true));
            // no ghost property on package
            sandbox.stub(perms, 'getPackageContents').returns(Promise.resolve(noGhostPackageJsonContents));

            perms.read().then(function (readPerms) {
                should.exist(readPerms);

                readPerms.should.equal(AppPermissions.DefaultPermissions);

                done();
            }).catch(done);
        });
        it('rejects when reading malformed package.json', function (done) {
            var perms = new AppPermissions('test');

            // package.json IS in this directory
            sandbox.stub(perms, 'checkPackageContentsExists').returns(Promise.resolve(true));
            // malformed JSON on package
            sandbox.stub(perms, 'getPackageContents').returns(Promise.reject(new Error('package.json file is malformed')));

            perms.read().then(function (readPerms) {
                /*jshint unused:false*/
                done(new Error('should not resolve'));
            }).catch(function (err) {
                err.message.should.equal('package.json file is malformed');
                done();
            });
        });
        it('reads from package.json in root of app directory', function (done) {
            var perms = new AppPermissions('test'),
                validGhostPackageJsonContents = validGhostPackageJson;

            // package.json IS in this directory
            sandbox.stub(perms, 'checkPackageContentsExists').returns(Promise.resolve(true));
            // valid ghost property on package
            sandbox.stub(perms, 'getPackageContents').returns(Promise.resolve(validGhostPackageJsonContents));

            perms.read().then(function (readPerms) {
                should.exist(readPerms);

                readPerms.should.not.equal(AppPermissions.DefaultPermissions);

                should.exist(readPerms.posts);
                readPerms.posts.length.should.equal(5);

                should.exist(readPerms.users);
                readPerms.users.length.should.equal(5);

                should.exist(readPerms.settings);
                readPerms.settings.length.should.equal(5);

                _.keys(readPerms).length.should.equal(3);

                done();
            }).catch(done);
        });
    });
});