package net.keinekekse.config

import java.io.InputStream
import java.util.*

private const val CONFIG_FILE_NAME = "config.properties"
private const val ERROR_LOADING_CONFIG = "Could not load configuration from $CONFIG_FILE_NAME"

// TODO mit WAR testen wg. Pfad zu config.properties
/**
 * Projekt-Properties
 *
 * Die Datei ```config.properties``` wird aus dem JAR-root geladen.
 * (-> in ```main/resources``` anlegen)
 *
 * ```
 * val prop: String = ConfigProperties.get("some.prop")
 * ```
 */
object ConfigProperties {
    private val properties = Properties()

    init {
        loadConfigFile()
    }

    private fun loadConfigFile() {
        val configFileStream: InputStream? =
            javaClass.classLoader.getResourceAsStream(CONFIG_FILE_NAME)
        if (configFileStream == null) {
            throw IllegalStateException(ERROR_LOADING_CONFIG)
        }

        configFileStream.use {
            properties.load(it)
        }
    }

    fun get(key: String): String = properties.getProperty(key)
}