const should = require('should');
const sinon = require('sinon');
const hbs = require('../../../../core/frontend/services/themes/engine');
const themes = require('../../../../core/frontend/services/themes');
// is only exposed via themes.getActive()
const activeTheme = require('../../../../core/frontend/services/themes/active');
const settingsCache = require('../../../../core/server/services/settings/cache');
const middleware = themes.middleware;

const sandbox = sinon.createSandbox();

function executeMiddleware(toExecute, req, res, next) {
    const [current, ...rest] = toExecute;

    current(req, res, function (err) {
        if (err) {
            return next(err);
        }
        if (!rest.length) {
            return next();
        }
        return executeMiddleware(rest, req, res, next);
    });
}

describe('Themes middleware', function () {
    afterEach(function () {
        sandbox.restore();
    });

    let req;
    let res;

    let fakeActiveTheme;
    let fakeActiveThemeName;
    let fakeSiteData;
    let fakeLabsData;

    beforeEach(function () {
        req = {app: {}};
        res = {locals: {}};

        fakeActiveTheme = {
            config: sandbox.stub().returns(2),
            mount: sandbox.stub()
        };

        fakeActiveThemeName = 'bacon-sensation';

        fakeSiteData = {};

        fakeLabsData = {
            // labs data is deep cloned,
            // if we want to compare it
            // we will need some unique content
            '@@REQUIRED@@': true
        };

        sandbox.stub(activeTheme, 'get')
            .returns(fakeActiveTheme);

        sandbox.stub(settingsCache, 'get')
            .withArgs('labs').returns(fakeLabsData)
            .withArgs('active_theme').returns(fakeActiveThemeName);

        sandbox.stub(settingsCache, 'getPublic')
            .returns(fakeSiteData);

        sandbox.stub(hbs, 'updateTemplateOptions');
    });

    it('mounts active theme if not yet mounted', function (done) {
        fakeActiveTheme.mounted = false;

        executeMiddleware(middleware, req, res, function next(err) {
            should.not.exist(err);

            fakeActiveTheme.mount.called.should.be.true();
            fakeActiveTheme.mount.calledWith(req.app).should.be.true();

            done();
        });
    });

    it('does not mounts the active theme if it is already mounted', function (done) {
        fakeActiveTheme.mounted = true;

        executeMiddleware(middleware, req, res, function next(err) {
            should.not.exist(err);

            fakeActiveTheme.mount.called.should.be.false();

            done();
        });
    });

    it('throws error if theme is missing', function (done) {
        activeTheme.get.restore();
        sandbox.stub(activeTheme, 'get')
            .returns(undefined);

        executeMiddleware(middleware, req, res, function next(err) {
            // Did throw an error
            should.exist(err);
            err.message.should.eql('The currently active theme "bacon-sensation" is missing.');

            activeTheme.get.called.should.be.true();
            fakeActiveTheme.mount.called.should.be.false();

            done();
        });
    });

    it('calls updateTemplateOptions with correct data', function (done) {
        const themeDataExpectedProps = ['posts_per_page', 'image_sizes'];

        executeMiddleware(middleware, req, res, function next(err) {
            should.not.exist(err);

            hbs.updateTemplateOptions.calledOnce.should.be.true();
            const templateOptions = hbs.updateTemplateOptions.firstCall.args[0];
            const data = templateOptions.data;

            data.should.be.an.Object().with.properties('site', 'labs', 'config');

            // Check Theme Config
            data.config.should.be.an.Object()
                .with.properties(themeDataExpectedProps)
                .and.size(themeDataExpectedProps.length);
            // posts per page should be set according to the stub
            data.config.posts_per_page.should.eql(2);

            // Check labs config
            should.deepEqual(data.labs, fakeLabsData);

            should.equal(data.site, fakeSiteData);

            done();
        });
    });

    it('Sets res.locals.secure to the value of req.secure', function (done) {
        req.secure = Math.random() < 0.5;

        executeMiddleware(middleware, req, res, function next(err) {
            should.not.exist(err);

            should.equal(res.locals.secure, req.secure);

            done();
        });
    });
});