'use strict';

const fs = require('fs-extra'),
    path = require('path'),
    debug = require('ghost-ignition').debug('services:settings:settings-loader'),
    common = require('../../lib/common'),
    config = require('../../config'),
    yamlParser = require('./yaml-parser');

/**
 * Reads the desired settings YAML file and passes the
 * file to the YAML parser which then returns a JSON object.
 * @param {String} setting the requested settings as defined in setting knownSettings
 * @returns {Promise<Object>} settingsFile
 */
module.exports = function loadSettings(setting) {
    // we only support the `yaml` file extension. `yml` will be ignored.
    const fileName = `${setting}.yaml`;
    const contentPath = config.getContentPath('settings');
    const filePath = path.join(contentPath, fileName);

    return fs.readFile(filePath, 'utf8')
        .then((file) => {
            debug('settings file found for', setting);

            // yamlParser returns a JSON object
            const parsed = yamlParser(file, fileName);

            return parsed;
        }).catch((error) => {
            if (common.errors.utils.isIgnitionError(error)) {
                throw error;
            }

            throw new common.errors.GhostError({
                message: common.i18n.t('errors.services.settings.loader', {setting: setting, path: contentPath}),
                context: filePath,
                err: error
            });
        });
};