var Promise = require('bluebird'),
    config = require('../../config'),
    common = require('../../lib/common'),
    checkTheme;

checkTheme = function checkTheme(theme, isZip) {
    var checkPromise,
        // gscan can slow down boot time if we require on boot, for now nest the require.
        gscan = require('gscan');

    if (isZip) {
        checkPromise = gscan.checkZip(theme, {
            keepExtractedDir: true
        });
    } else {
        checkPromise = gscan.check(theme.path);
    }

    return checkPromise
        .then(function resultHandler(checkedTheme) {
            checkedTheme = gscan.format(checkedTheme, {
                onlyFatalErrors: config.get('env') === 'production'
            });

            // CASE: production and no fatal errors
            // CASE: development returns fatal and none fatal errors, theme is only invalid if fatal errors
            if (!checkedTheme.results.error.length ||
                config.get('env') === 'development' && !checkedTheme.results.hasFatalErrors) {
                return checkedTheme;
            }

            return Promise.reject(new common.errors.ThemeValidationError({
                message: common.i18n.t('errors.api.themes.invalidTheme'),
                errorDetails: checkedTheme.results.error,
                context: checkedTheme
            }));
        }).catch(function (error) {
            return Promise.reject(error);
        });
};

module.exports.check = checkTheme;