/**

 * Back 2 Browser Bytecode Translator

 * Copyright (C) 2012-2015 Jaroslav Tulach <jaroslav.tulach@apidesign.org>

 *

 * This program is free software: you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation, version 2 of the License.

 *

 * This program 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 for more details.

 *

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

 * along with this program. Look for COPYING file in the top folder.

 * If not, see http://opensource.org/licenses/GPL-2.0.

 */

package org.apidesign.vm4brwsr;

import net.java.html.js.JavaScriptBody;

import net.java.html.lib.Date;

import static net.java.html.lib.Exports.NaN;

import static net.java.html.lib.Exports.eval;

import static net.java.html.lib.Exports.isNaN;

import static net.java.html.lib.Exports.parseInt;

import net.java.html.lib.Objs;

public class LibUse {

    public static int fourtyTwo() {

        Number n = (Number) eval("6 * 7");

        return n.intValue();

    }

    public static String hiProperty(String set) {

        final Object obj = eval("var x = {}; x.x = 'Hi'; x");

        if (obj == null) {

            throw new IllegalStateException("Some Value returned " + obj);

        }

        if (!(obj instanceof Objs)) {

            throw new IllegalStateException("The result is Objs: " + obj.getClass());

        }

        Objs js = (Objs) obj;

        if (set != null) {

            js.$set("x", set);

        }

        return (String) js.$get("x");

    }

    public static double parse(String str) throws Exception {

        return parseInt(str);

    }

    public static double parse(String str, int radix) throws Exception {

        return parseInt(str, radix);

    }

    public boolean checkNaN() throws Exception {

        double nan = NaN;

        return isNaN(nan);

    }

    public double dateOperation() throws Exception {

        Date eleven = new Date(2016, 1, 10);

        return eleven.getFullYear() + eleven.getMonth();

    }

    public static double arrayForEach() throws Exception {

        net.java.html.lib.Array<java.lang.Number> arr = new net.java.html.lib.Array<>();

        assertNumber(arr.length.get(), 0.0, "Empty at first");

        arr.push(1.1, 2.2, 3);

        assertNumber(arr.$get(0), 1.1, "1.1 is on position 0");

        assertNumber(arr.$get(1), 2.2, "2.2 is on position 1");

        assertNumber(arr.$get(2), 3.0, "3 is on position 2");

        final boolean[] called = { false };

        final double[] sum = { 0.0 };

        arr.forEach(new net.java.html.lib.Function.A1<java.lang.Number,Void>() {

            @Override

            public Void call(java.lang.Number p1) {

                called[0] = true;

                sum[0] += p1.doubleValue();

                return null;

            }

            @Override

            public Void call(Number p1, Object p2) {

                return call(p1);

            }

            @Override

            public Void call(Number p1, Object p2, Object p3) {

                return call(p1);

            }

            @Override

            public Void call(Number p1, Object p2, Object p3, Object p4) {

                return call(p1);

            }

            @Override

            public Void call(Number p1, Object p2, Object p3, Object p4, Object p5) {

                return call(p1);

            }

        });

        assertTrue(called[0], "forEach invoked");

        assertEquals(sum[0], 6.3, 0.1, "Sum computed");

        return sum[0];

    }

    private static void assertEquals(double real, double expected, double delta, String msg) {

        if (expected - delta < real && real < expected + delta) {

            return;

        }

        raise(msg + " exp: " + expected + " but was: " + real);

    }

    @JavaScriptBody(args = { "msg" }, body = "throw msg;")

    private static native void raise(String msg);

    private static void assertNumber(Object value, double expected, String msg) {

        if (value instanceof Number) {

            assertEquals(((Number)value).doubleValue(), expected, 0.1, msg);

        } else {

            if (value == null) {

                raise("null is not a number");

                return;

            }

            raise("Not a number: " + value + " type: " + value.getClass());

        }

    }

    private static void assertTrue(boolean b, String msg) {

        if (!b) {

            raise(msg);

        }

    }

}