package com.alttd.forms.properties;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.net.URI;
import java.nio.file.Path;
import java.util.Optional;
import java.util.Properties;

public class PropertiesLoader {

    private static final Logger logger = LoggerFactory.getLogger(PropertiesLoader.class);

    public static Optional<Properties> loadProperties(String path, String fileName) {
        Properties prop = new Properties();
        File file;
        if (path.isEmpty()) {
            Optional<File> currentJarPath = JarPath.getCurrentJarDir();
            if (currentJarPath.isEmpty()) {
                logger.error("Unable to find jar path to load properties (" + fileName + ")");
                return Optional.empty();
            }
            file = new File(currentJarPath.get(), fileName);
        } else {
            file = new File(path, fileName);
        }


        if (!file.exists()) {
            logger.warn("Tried to load properties file that doesnt exists (" + fileName + ")");
            return Optional.empty();
        }

        if (!file.canRead()) {
            logger.error("Unable to read properties file (" + fileName + ")");
            return Optional.empty();
        }

        if (!file.isFile()) {
            logger.error("Invalid properties file (" + fileName + ")");
            return Optional.empty();
        }

        try (FileInputStream input = new FileInputStream(file)) {
            prop.load(input);
            return Optional.of(prop);
        } catch (IOException ex) {
            logger.error("Failed to load properties due to an unexpected error", ex);
        }
        return Optional.empty();
    }
}