const path = require('path');
const nconf = require('nconf');

const getConfigDir = () => {
    if (process.env.CONFIG_DIR) {
        return process.env.CONFIG_DIR;
    }
    return path.join(process.cwd(), 'config');
};

const loadConfigFiles = () => {
    const configDir = getConfigDir();
    console.log("configDir = ", configDir);

    // Load from default config file
    nconf.file({
        file: path.join(configDir, 'config.default.json')
    });

    if (process.env.NODE_ENV) {
        // Load/override defaults with environment specific config files (preprod / prod etc)
         nconf.file({
            file: path.join(configDir, `config.${process.env.NODE_ENV}.json`)
        });
        if (process.env.NODE_SUB_ENV) {
            // Load/override with sub environment specific config files - (dev / qa / stage etc)
            nconf.file({
                file: path.join(configDir, `config.${process.env.NODE_ENV}.${process.env.NODE_SUB_ENV}.json`)
            });
        }
    }
}

const init = () => {
    // Preffered config hierarchy

    // 1st priority for command line arguments
    nconf.argv();

    // 2nd priority for environment variables
    nconf.env();

    // 3rd priority for config files
    loadConfigFiles();

    /*
     * last priotiy hardcoded default values
     * Note: this should be at the bottom of your configuration file
     */
    // nconf.defaults({
    //     "someKey": "someValue"
    // });
};

module.exports = {
    init
};