/*

 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.

 * 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.tools.jjs;

import java.io.IOException;

import java.util.Collections;

import java.util.HashSet;

import java.util.Set;

import java.util.function.Function;

import jdk.internal.jline.console.history.FileHistory;

import jdk.internal.jline.console.history.History;

import jdk.nashorn.api.scripting.AbstractJSObject;

import jdk.nashorn.api.scripting.JSObject;

import jdk.nashorn.internal.runtime.JSType;

import static jdk.nashorn.internal.runtime.ScriptRuntime.UNDEFINED;

/*

 * A script friendly object that exposes history of commands to scripts.

 */

final class HistoryObject extends AbstractJSObject {

    private static final Set<String> props;

    static {

        final HashSet<String> s = new HashSet<>();

        s.add("clear");

        s.add("forEach");

        s.add("print");

        s.add("size");

        props = Collections.unmodifiableSet(s);

    }

    private final FileHistory hist;

    HistoryObject(final FileHistory hist) {

        this.hist = hist;

    }

    @Override

    public Object getMember(final String name) {

        switch (name) {

            case "clear":

                return (Runnable)hist::clear;

            case "forEach":

                return (Function<JSObject, Object>)this::iterate;

            case "print":

                return (Runnable)this::print;

            case "size":

                return hist.size();

        }

        return UNDEFINED;

    }

    @Override

    public Object getDefaultValue(final Class<?> hint) {

        if (hint == String.class) {

            return toString();

        }

        return UNDEFINED;

    }

    @Override

    public String toString() {

    }

    @Override

    public Set<String> keySet() {

        return props;

    }

    private void print() {

        for (History.Entry e : hist) {

            System.out.println(e.value());

        }

    }

    private Object iterate(final JSObject func) {

        for (History.Entry e : hist) {

            if (JSType.toBoolean(func.call(this, e.value().toString()))) {

                break; // return true from callback to skip iteration

            }

        }

        return UNDEFINED;

    }

}