const ServiceManager = require('./ServiceManager')

class SystemDManager extends ServiceManager {
    _command_restart_service = 'systemctl restart %%SERVICE%%'
    _command_start_service = 'systemctl start %%SERVICE%%'
    _command_stop_service = 'systemctl stop %%SERVICE%%'
    _command_reload_service = 'systemctl reload %%SERVICE%%'
    _command_enable_service = 'systemctl enable %%SERVICE%%'
    _command_disable_service = 'systemctl disable %%SERVICE%%'
    _command_daemon_reload = 'systemctl daemon-reload'

    async status(...services) {
        const statuses = []
        for ( const service_name of services ) {
            const result = await this._host.execute(`systemctl status -l --value --no-pager ${service_name}`)
            if ( result.exit_code !== 0 ) {
                throw new Error(`Unable to determine service state: ${result.stderr.join('\n')}`)
            }

            const status = result.clean_out.map(x => x.trim().toLowerCase())
                                        .filter(x => x.startsWith('active:'))[0]
                                        .split(':')[1]
                                        .trim()


            statuses.push({
                name: service_name,
                status: this._determine_status_from_string(status)
            })
        }

        return statuses.length === 1 ? statuses[0] : statuses
    }

    async install(config) {
        if ( !config._build || !config.name ) throw new Error('Config must be instance of classes/logical/services/ServiceConfig')
        const file_contents = config._build()
        const name = config.name()

        const service_file = await this._host.get_path(`/etc/systemd/system/${name}.service`)
        await service_file.echo(file_contents)
    }

    _determine_status_from_string(str) {
        if ( str.startsWith('active') ) {
            return this.constructor.SERVICE_STATE_RUNNING
        } else if ( str.startsWith('fail') ) {
            return this.constructor.SERVICE_STATE_ERROR
        } else {
            return this.constructor.SERVICE_STATE_STOPPED
        }
    }
}

module.exports = exports = SystemDManager