/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */
package com.sun.star.script.framework.container;

import com.sun.star.deployment.XPackage;

import com.sun.star.io.XOutputStream;
import com.sun.star.io.XTruncate;

import com.sun.star.script.framework.io.XInputStreamWrapper;
import com.sun.star.script.framework.io.XOutputStreamWrapper;
import com.sun.star.script.framework.log.LogUtils;
import com.sun.star.script.framework.provider.PathUtils;

import com.sun.star.uno.UnoRuntime;
import com.sun.star.uno.XComponentContext;

import java.io.InputStream;
import java.io.OutputStream;

import java.util.HashMap;
import java.util.Map;

public class UnoPkgContainer extends ParcelContainer {

    private final Map<String, ParcelContainer> registeredPackages = new HashMap<String, ParcelContainer>();
    private final String extensionDb;
    private final String extensionRepository;

    public UnoPkgContainer(XComponentContext xCtx, String locationURL,
                           String _extensionDb, String _extensionRepository,
                           String language) throws
        com.sun.star.lang.IllegalArgumentException,
        com.sun.star.lang.WrappedTargetException {

        super(xCtx, locationURL, language, false);
        extensionDb = _extensionDb;
        extensionRepository = _extensionRepository;
        init();
    }

    // gets the ParcelContainer for persisted uno packages
    public ParcelContainer getRegisteredUnoPkgContainer(String url) {

        if (!url.endsWith("/")) {
            url += "/";
        }

        LogUtils.DEBUG("** getRegisterPackage ctx = " + containerUrl);
        LogUtils.DEBUG("** getRegisterPackage  for uri " + url);
        LogUtils.DEBUG("** getRegisterPackage  for language " + language);

        ParcelContainer result = registeredPackages.get(url);
        LogUtils.DEBUG("getRegisterPackage result is  " + result);
        return result;
    }

    public boolean hasRegisteredUnoPkgContainer(String url) {
        return getRegisteredUnoPkgContainer(url) != null;
    }

    private void registerPackageContainer(String url, ParcelContainer c) {

        if (!url.endsWith("/")) {
            url += "/";
        }

        LogUtils.DEBUG("RegisterPackage ctx = " + containerUrl);
        LogUtils.DEBUG("RegisterPackage language = " + language);
        LogUtils.DEBUG("RegisterPackage " + c + " for url " + url);
        registeredPackages.put(url, c);
    }

    public void deRegisterPackageContainer(String url) {

        if (!url.endsWith("/")) {
            url += "/";
        }

        LogUtils.DEBUG("In deRegisterPackageContainer for " + url);

        if (hasRegisteredUnoPkgContainer(url)) {
            try {
                DeployedUnoPackagesDB db = getUnoPackagesDB();

                if (db != null && db.removePackage(language, url)) {
                    writeUnoPackageDB(db);
                    ParcelContainer container = registeredPackages.get(url);

                    if (!container.hasElements()) {
                        // When all libraries within a package bundle
                        // ( for this language ) are removed also
                        // remove the container from its parent
                        // Otherwise, a container ( with no containers )
                        // representing the uno package bundle will
                        // still exist and so will get displayed
                        if (container.parent() != null) {
                            container.parent().removeChildContainer(container);
                        }
                    }

                    registeredPackages.remove(url);
                }
            } catch (Exception e) {
                //TODO revisit exception handling and exception here
                //means something very wrong
                LogUtils.DEBUG("***** deRegisterPackageContainer() got exception " + e);
            }
        }

        LogUtils.DEBUG("Leaving deRegisterPackageContainer for " + url);
    }

    private void init() throws com.sun.star.lang.IllegalArgumentException {
        LogUtils.DEBUG("getting container for  " + containerUrl);

        try {
            DeployedUnoPackagesDB db = getUnoPackagesDB();

            if (db != null) {
                String[] packages = db.getDeployedPackages(language);

                for (String thepackage : packages) {
                    try {
                        processUnoPackage(thepackage, language);
                    } catch (com.sun.star.lang.IllegalArgumentException ila) {
                        LogUtils.DEBUG("Failed to process " + thepackage
                                       + " for " + language);
                        LogUtils.DEBUG("   Reason: " + ila);
                    } catch (Exception e) {
                        // TODO proper exception or do we wish
                        // to ignore errors here
                        LogUtils.DEBUG("Something very wrong!!!!!");
                        LogUtils.DEBUG("Failed to process " + thepackage
                                       + " for " + language);
                        LogUtils.DEBUG("   Reason: " + e);
                    }
                }
            }
        } catch (com.sun.star.lang.WrappedTargetException e) {
            // no deployed packages
            LogUtils.DEBUG("No deployed uno-packages for " + containerUrl);
        }
    }

    @Override
    public ScriptMetaData findScript(ParsedScriptUri psu) throws
        com.sun.star.container.NoSuchElementException,
        com.sun.star.lang.WrappedTargetException {

        String functionName = psu.function;
        String parcelName = psu.parcel;
        String location = psu.location;

        LogUtils.DEBUG("*** UnoPkgContainer.findScript() ***" +
                       "\ncontainerUrl = " + containerUrl +
                       "\nfunction = " + functionName +
                       "\nlocation = " + location +
                       "\nparcel = " + parcelName);

        ParcelContainer pc = getChildContainer(location);

        if (pc  == null) {
            throw new com.sun.star.lang.WrappedTargetException(
                "Failed to resolve script " , null,
                new com.sun.star.lang.IllegalArgumentException(
                    "Cannot resolve script location for script = " + functionName));
        }

        return pc.findScript(psu);
    }

    private DeployedUnoPackagesDB getUnoPackagesDB() throws
        com.sun.star.lang.WrappedTargetException {

        InputStream is = null;
        DeployedUnoPackagesDB dp = null;

        try {

            String packagesUrl =
                PathUtils.make_url(extensionDb,
                                   "/Scripts/" + extensionRepository + "-extension-desc.xml");

            LogUtils.DEBUG("getUnoPackagesDB() looking for existing db in "
                           + packagesUrl);

            if (m_xSFA.exists(packagesUrl)) {
                if (packagesUrl.startsWith("vnd.sun.star.tdoc")) {
                    // handles using XStorage directly
                    throw new com.sun.star.lang.WrappedTargetException(
                        "Can't handle documents yet");
                }

                is = new XInputStreamWrapper(m_xSFA.openFileRead(packagesUrl));
                dp = new DeployedUnoPackagesDB(is);

                try {
                    is.close();
                    is = null;
                } catch (Exception ignore) {
                }
            } else {
                LogUtils.DEBUG("getUnoPackagesDB() " + packagesUrl
                               + " does not exist");
            }
        } catch (Exception e) {
            LogUtils.DEBUG("getUnoPackagesDB() caught Exception: " + e);
            LogUtils.DEBUG(LogUtils.getTrace(e));
            throw new com.sun.star.lang.WrappedTargetException(e);
        } finally {
            if (is != null) {
                try {
                    is.close();
                    is = null;
                } catch (Exception ignore) {
                }
            }
        }

        return dp;
    }

    private  void writeUnoPackageDB(DeployedUnoPackagesDB dp) throws
        com.sun.star.lang.IllegalArgumentException,
        com.sun.star.lang.WrappedTargetException {

        LogUtils.DEBUG("In writeUnoPackageDB() ");

        XOutputStream xos = null;
        OutputStream os = null;

        try {

            String packagesUrl =
                PathUtils.make_url(extensionDb, "/Scripts/" + extensionRepository
                                   + "-extension-desc.xml");

            xos =  m_xSFA.openFileWrite(packagesUrl);
            XTruncate xTrc = UnoRuntime.queryInterface(XTruncate.class, xos);

            if (xTrc != null) {
                LogUtils.DEBUG("In writeUnoPackageDB() Truncating...");
                xTrc.truncate();
            } else {
                LogUtils.DEBUG("In writeUnoPackageDB() CAN'T Truncate...");
            }

            os = new XOutputStreamWrapper(xos);
            dp.write(os);

            try {
                os.close(); // will close xos
                os = null;
            } catch (Exception ignore) {
            }
        } catch (Exception e) {
            LogUtils.DEBUG("In writeUnoPackageDB() Exception: " + e);
            throw new com.sun.star.lang.WrappedTargetException(e);
        } finally {
            if (os != null) {
                try {
                    os.close(); // will close xos
                    os = null;
                } catch (Exception ignore) {
                }
            }
        }
    }

    public  void processUnoPackage(XPackage dPackage,
                                   String language) throws
        com.sun.star.lang.IllegalArgumentException,
        com.sun.star.lang.WrappedTargetException,
        com.sun.star.container.ElementExistException {

        LogUtils.DEBUG("** in processUnoPackage ");

        String uri =  dPackage.getURL();

        if (!uri.endsWith("/")) {
            uri += "/";
        }

        LogUtils.DEBUG("** processUnoPackage getURL() -> " + uri);
        LogUtils.DEBUG("** processUnoPackage getName() -> " + dPackage.getName());
        LogUtils.DEBUG("** processUnoPackage getMediaType() -> "
                       + dPackage.getPackageType().getMediaType());

        try {
            LogUtils.DEBUG("** processUnoPackage getDisplayName() -> "
                           + dPackage.getDisplayName());
        } catch (com.sun.star.deployment.ExtensionRemovedException e) {
            throw new com.sun.star.lang.WrappedTargetException(e.getMessage(), this, e);
        }

        processUnoPackage(uri, language);

        DeployedUnoPackagesDB db = getUnoPackagesDB();

        if (db == null) {
            try {
                db = new DeployedUnoPackagesDB();
            } catch (java.io.IOException ioe) {
                throw new com.sun.star.lang.WrappedTargetException(ioe);
            }
        }

        db.addPackage(language, uri);
        writeUnoPackageDB(db);
    }

    private  void processUnoPackage(String uri,
                                    String language) throws
        com.sun.star.lang.IllegalArgumentException,
        com.sun.star.lang.WrappedTargetException,
        com.sun.star.container.ElementExistException {

        if (hasRegisteredUnoPkgContainer(uri)) {
            throw new com.sun.star.container.ElementExistException(
                "Already a registered uno package " + uri + " for language "
                + language);
        }

        LogUtils.DEBUG("processUnoPackage - URL = " + uri);
        LogUtils.DEBUG("processUnoPackage - script library package");
        String parentUrl = uri;

        if (uri.contains("%2Funo_packages%2F") ||
            uri.contains("/uno_packages/") ||
            uri.contains("$UNO_USER_PACKAGES_CACHE/") ||
            uri.contains("$UNO_SHARED_PACKAGES_CACHE/") ||
            uri.contains("$BUNDLED_EXTENSIONS/")) {

            //its in a bundle need to determine the uno-package file its in
            LogUtils.DEBUG("processUnoPackage - is part of a UNO bundle");

            int index = uri.lastIndexOf('/');

            if (uri.endsWith("/")) {
                uri = uri.substring(0, index);
                index = uri.lastIndexOf('/');
            }

            if (index > -1) {
                parentUrl = uri.substring(0, index);
                LogUtils.DEBUG("processUnoPackage - composition is contained in "
                               + parentUrl);
            }

            ParcelContainer pkgContainer = getChildContainerForURL(parentUrl);

            if (pkgContainer == null) {
                pkgContainer =
                    new ParcelContainer(this, m_xCtx, parentUrl, language, false);

                if (pkgContainer.loadParcel(uri) == null) {
                    throw new com.sun.star.lang.IllegalArgumentException(
                        "Couldn't load script library from composition package "
                        + uri + " for language " + language);
                }

                addChildContainer(pkgContainer);
            } else {
                if (pkgContainer.loadParcel(uri) == null) {
                    throw new com.sun.star.lang.IllegalArgumentException(
                        "Couldn't load script library from composition package "
                        + uri + " for language " + language);
                }

            }

            registerPackageContainer(uri,  pkgContainer);
        } else {
            // stand-alone library package, e.g. not contained in
            // a uno package
            if (loadParcel(uri) == null) {
                throw new com.sun.star.lang.IllegalArgumentException(
                    "Couldn't load script library package " + uri
                    + " for language " + language);
            }

            registerPackageContainer(uri, this);
        }
    }
}