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package net.java.ao.test;

import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

public final class ConfigurationProperties {
    private static Properties props = null;

    public static String get(String key, final String defaultValue) {
        String value = load().getProperty(key, defaultValue);
        if (value == null || value.startsWith("${")) // we're using an unfiltered test.properties
        {
            value = defaultValue;
        }
        return value;
    }

    private static Properties load() {
        if (props == null) {
            props = load(getFileName());
        }
        return props;
    }

    private static Properties load(String configFile) {
        final Properties properties = new Properties();
        final InputStream configFileStream = ConfigurationProperties.class.getResourceAsStream("/" + configFile);
        if (configFileStream != null) {
            try {
                properties.load(configFileStream);
            } catch (IOException e) {
                throw new IllegalStateException("Error loading properties from resource <" + configFile + ">", e);
            } finally {
                close(configFileStream);
            }
        }

        // adding all system properties
        properties.putAll(System.getProperties());
        return properties;
    }

    /**
     * Gets the file name for JDBC configuration
     *
     * @return the value of the system property {@code jdbc.file}, or {@code jdbc.properties} if it doesn't exists
     */
    private static String getFileName() {
        return System.getProperty("test.file", "test.properties");
    }

    private static void close(InputStream stream) {
        try {
            stream.close();
        } catch (IOException e) {
            // ignore
        }
    }
}