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/* (C) 2025 Linnea Gräf - Licensed to everyone under the BSD 3 Clause License */
package moe.nea.prickly.config;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.*;
import java.util.stream.Collectors;
import lombok.extern.slf4j.Slf4j;
import org.jspecify.annotations.Nullable;
@Slf4j
public class ConfigCompat {
public static final Path ENV_FILE = Path.of(".env").toAbsolutePath();
@SuppressWarnings({"unchecked", "rawtypes"})
private static Map<String, String> loadDotenv() {
var properties = new Properties();
if (!Files.exists(ENV_FILE)) {
log.info("no .env file found at {}", ENV_FILE);
} else {
try (var reader = Files.newBufferedReader(ENV_FILE, StandardCharsets.UTF_8)) {
properties.load(reader);
log.info("loaded environment from {} ({} entries)", ENV_FILE, properties.size());
} catch (IOException e) {
log.error("could not read .env file at {}", ENV_FILE, e);
}
}
return (Map) properties;
}
public static Map<String, String> DOTENV_FALLBACK = Collections.unmodifiableMap(loadDotenv());
public static NavigableMap<String, String> ENV;
static {
var env = new TreeMap<String, String>();
env.putAll(DOTENV_FALLBACK);
env.putAll(System.getenv());
ENV = Collections.unmodifiableNavigableMap(env);
}
public static @Nullable String getEnv(String key) {
return ENV.get(key);
}
public static Map<String, String> getAllEnvStartingWith(String prefix) {
return ENV.subMap(prefix + "_", prefix + (char) ((int) '_' + 1));
}
public static Set<String> getAllDirectChildren(String prefix) {
int start = prefix.length() + 1;
return getAllEnvStartingWith(prefix).keySet().stream()
.map(it -> {
int nextUnderscore = it.indexOf('_', start);
if (nextUnderscore < 0) return it.substring(start);
else return it.substring(start, nextUnderscore);
})
.collect(Collectors.toSet());
}
}
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