/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package jdk.nashorn.internal.runtime;

import java.io.Serializable;

import java.util.Arrays;

import java.util.HashMap;

import java.util.Map;

/**

 * Class representing a persistent compiled script.

 */

public final class StoredScript implements Serializable {

    /** Compilation id */

    private final int compilationId;

    /** Main class name. */

    private final String mainClassName;

    /** Map of class names to class bytes. */

    private final Map<String, byte[]> classBytes;

    /** Constants array. */

    private final Object[] constants;

    /** Function initializers */

    private final Map<Integer, FunctionInitializer> initializers;

    private static final long serialVersionUID = 2958227232195298340L;

    /**

     * Constructor.

     *

     * @param compilationId compilation id

     * @param mainClassName main class name

     * @param classBytes map of class names to class bytes

     * @param initializers initializer map, id -> FunctionInitializer

     * @param constants constants array

     */

    public StoredScript(final int compilationId, final String mainClassName, final Map<String, byte[]> classBytes, final Map<Integer, FunctionInitializer> initializers, final Object[] constants) {

        this.compilationId = compilationId;

        this.mainClassName = mainClassName;

        this.classBytes = classBytes;

        this.constants = constants;

        this.initializers = initializers;

    }

    /**

     * Get the compilation id for this StoredScript

     * @return compilation id

     */

    public int getCompilationId() {

        return compilationId;

    }

    private Map<String, Class<?>> installClasses(final Source source, final CodeInstaller installer) {

        final Map<String, Class<?>> installedClasses = new HashMap<>();

        final byte[]   mainClassBytes = classBytes.get(mainClassName);

        final Class<?> mainClass      = installer.install(mainClassName, mainClassBytes);

        installedClasses.put(mainClassName, mainClass);

        for (final Map.Entry<String, byte[]> entry : classBytes.entrySet()) {

            final String className = entry.getKey();

            if (!className.equals(mainClassName)) {

                installedClasses.put(className, installer.install(className, entry.getValue()));

            }

        }

        installer.initialize(installedClasses.values(), source, constants);

        return installedClasses;

    }

    FunctionInitializer installFunction(final RecompilableScriptFunctionData data, final CodeInstaller installer) {

        final Map<String, Class<?>> installedClasses = installClasses(data.getSource(), installer);

        assert initializers != null;

        assert initializers.size() == 1;

        final FunctionInitializer initializer = initializers.values().iterator().next();

        for (int i = 0; i < constants.length; i++) {

            if (constants[i] instanceof RecompilableScriptFunctionData) {

                // replace deserialized function data with the ones we already have

                final RecompilableScriptFunctionData newData = data.getScriptFunctionData(((RecompilableScriptFunctionData) constants[i]).getFunctionNodeId());

                assert newData != null;

                newData.initTransients(data.getSource(), installer);

                constants[i] = newData;

            }

        }

        initializer.setCode(installedClasses.get(initializer.getClassName()));

        return initializer;

    }

    /**

     * Install as script.

     *

     * @param source the source

     * @param installer the installer

     * @return main script class

     */

    Class<?> installScript(final Source source, final CodeInstaller installer) {

        final Map<String, Class<?>> installedClasses = installClasses(source, installer);

        for (final Object constant : constants) {

            if (constant instanceof RecompilableScriptFunctionData) {

                final RecompilableScriptFunctionData data = (RecompilableScriptFunctionData) constant;

                data.initTransients(source, installer);

                final FunctionInitializer initializer = initializers.get(data.getFunctionNodeId());

                if (initializer != null) {

                    initializer.setCode(installedClasses.get(initializer.getClassName()));

                    data.initializeCode(initializer);

                }

            }

        }

        return installedClasses.get(mainClassName);

    }

    @Override

    public int hashCode() {

        int hash = mainClassName.hashCode();

        hash = 31 * hash + classBytes.hashCode();

        hash = 31 * hash + Arrays.hashCode(constants);

        return hash;

    }

    @Override

    public boolean equals(final Object obj) {

        if (obj == this) {

            return true;

        }

        if (!(obj instanceof StoredScript)) {

            return false;

        }

        final StoredScript cs = (StoredScript) obj;

        return mainClassName.equals(cs.mainClassName)

                && classBytes.equals(cs.classBytes)

                && Arrays.equals(constants, cs.constants);

    }

}