package org.purl.wf4ever.robundle;

import java.io.Closeable;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.FileSystem;
import java.nio.file.Files;
import java.nio.file.Path;

import org.purl.wf4ever.robundle.fs.BundleFileSystem;
import org.purl.wf4ever.robundle.manifest.Manifest;
import org.purl.wf4ever.robundle.manifest.RDFToManifest;
import org.purl.wf4ever.robundle.manifest.combine.CombineManifest;
import org.purl.wf4ever.robundle.manifest.odf.ODFManifest;

public class Bundle implements Closeable {

	private boolean deleteOnClose;
	private Manifest manifest;
	private final Path root;

	public Bundle(Path root, boolean deleteOnClose) {
		this.root = root;
		this.setDeleteOnClose(deleteOnClose);
	}

	@Override
	public void close() throws IOException {
		close(isDeleteOnClose());
	}

	protected void close(boolean deleteOnClose) throws IOException {
		if (!getFileSystem().isOpen()) {
			return;
		}

		if (!deleteOnClose) {
			// update manifest
			getManifest().populateFromBundle();
			getManifest().writeAsJsonLD();
			if (ODFManifest.containsManifest(this)) {
				getManifest().writeAsODFManifest();
			}
			if (CombineManifest.containsManifest(this)) {
				getManifest().writeAsCombineManifest();
			}
		} else {
			// FIXME: Enable this if closing temporary bundles is
			// slow doing closing (as those files are being compressed):
			// RecursiveDeleteVisitor.deleteRecursively(getRoot());
		}
		getFileSystem().close();
		if (deleteOnClose) {
			Files.deleteIfExists(getSource());
		}
	}

	public FileSystem getFileSystem() {
		return getRoot().getFileSystem();
	}

	public Manifest getManifest() throws IOException {
		if (manifest == null) {
			synchronized (this) {
				if (manifest == null) {
					manifest = readOrPopulateManifest();
				}
			}
		}
		return manifest;
	}

	public Path getPath(String path) {
		return getRoot().resolve(path);
	}

	public Path getRoot() {
		return root;
	}

	public Path getSource() {
		BundleFileSystem fs = (BundleFileSystem) getFileSystem();
		return fs.getSource();
	}

	public boolean isDeleteOnClose() {
		return deleteOnClose;
	}

	protected Manifest readOrPopulateManifest() throws IOException {
		Manifest newManifest = new Manifest(this);
		Path manifestPath = Bundles.getManifestPath(this);
		if (Files.exists(manifestPath)) {
			try (InputStream manifestStream = Files
					.newInputStream(manifestPath)) {
				new RDFToManifest().readTo(manifestStream, newManifest,
						manifestPath.toUri());
			}
			// TODO: Also support reading manifest.rdf?
		} else if (ODFManifest.containsManifest(this)) {
			new ODFManifest(newManifest).readManifestXML();
		} else if (CombineManifest.containsManifest(this)) {
			new CombineManifest(newManifest).readCombineArchive();
		} else {
			// Fallback (might be a fresh or 3rd party bundle), populate from
			// zip content
			newManifest.populateFromBundle();
		}
		return newManifest;
	}

	public void setDeleteOnClose(boolean deleteOnClose) {
		this.deleteOnClose = deleteOnClose;
	}

}