package de.superx.libs;

import static org.junit.Assert.assertTrue;

import java.io.File;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import org.junit.Assume;
import org.junit.Test;

/**
 * Verifies that all JAR files in the lib directories are declared in build.gradle.
 *
 * <p>Requires running {@code ./gradlew generateDeclaredJarsManifest} before this test,
 * which writes all declared JAR names to {@code superx-build/declared-jars.txt}.
 * If the manifest does not exist the test is silently skipped via {@link Assume}
 * so local developers without a prior Gradle run are not affected.</p>
 *
 * <p>Checked directories:
 * <ul>
 *   <li>{@code superx/WEB-INF/lib/} — vollstaendig (alle direkten JARs)</li>
 *   <li>{@code superx/WEB-INF/kettle-plugins/} — nur direkte JARs je Plugin-Dir, keine rekursivenSubdirs</li>
 *   <li>{@code superx/WEB-INF/lib_ext/} wird bewusst nicht geprueft</li>
 * </ul>
 * </p>
 */
public class DeclaredLibsTest {

    private static final String MANIFEST_PATH = "superx-build/declared-jars.txt";

    private static final String LIB_DIR = "superx/WEB-INF/lib";

    private static final String KETTLE_PLUGINS_DIR = "superx/WEB-INF/kettle-plugins";

    @SuppressWarnings("static-method")
    @Test
    public void allJarsInLibDirsDeclaredInBuildGradle() throws IOException {
        File manifestFile = new File(MANIFEST_PATH);
        if (!manifestFile.exists()) {
            System.out.println("[DeclaredLibsTest] SKIP: Manifest '" + MANIFEST_PATH + "' nicht gefunden."
                + " Bitte zuerst './gradlew generateDeclaredJarsManifest' ausfuehren.");
        }
        Assume.assumeTrue(
            "Manifest nicht gefunden – bitte zuerst './gradlew generateDeclaredJarsManifest' ausfuehren",
            manifestFile.exists()
        );

        Set<String> declaredJars = new HashSet<>(
            Files.readAllLines(manifestFile.toPath(), StandardCharsets.UTF_8)
        );

        List<String> undeclaredJars = new ArrayList<>();

        File libDir = new File(LIB_DIR);
        if (libDir.exists()) {
            File[] files = libDir.listFiles();
            if (files != null) {
                for (File f : files) {
                    if (f.isFile() && f.getName().endsWith(".jar") && !declaredJars.contains(f.getName())) {
                        undeclaredJars.add(LIB_DIR + "/" + f.getName());
                    }
                }
            }
        }

        // Kettle plugin dirs: only direct JARs in each plugin directory.
        // Transitive dependencies in lib/ subdirs are intentionally not tracked individually.
        File kettleDir = new File(KETTLE_PLUGINS_DIR);
        if (kettleDir.exists()) {
            File[] pluginDirs = kettleDir.listFiles(File::isDirectory);
            if (pluginDirs != null) {
                for (File pluginDir : pluginDirs) {
                    File[] pluginFiles = pluginDir.listFiles();
                    if (pluginFiles == null) {
                        continue;
                    }
                    for (File f : pluginFiles) {
                        if (f.isFile() && f.getName().endsWith(".jar") && !declaredJars.contains(f.getName())) {
                            undeclaredJars.add(pluginDir.getPath().replace('\\', '/') + "/" + f.getName());
                        }
                    }
                }
            }
        }

        assertTrue(
            "JARs gefunden, die NICHT in build.gradle deklariert sind"
            + " – bitte in der passenden Configuration eintragen:\n  "
            + String.join("\n  ", undeclaredJars),
            undeclaredJars.isEmpty()
        );
    }
}