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package com.oracle.truffle.js.test.polyglot;

import static org.junit.Assert.assertEquals;

import org.graalvm.polyglot.Context;
import org.graalvm.polyglot.HostAccess;
import org.graalvm.polyglot.Value;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import com.oracle.truffle.api.interop.InteropLibrary;
import com.oracle.truffle.api.interop.TruffleObject;
import com.oracle.truffle.api.interop.UnsupportedMessageException;
import com.oracle.truffle.api.library.ExportLibrary;
import com.oracle.truffle.api.library.ExportMessage;
import com.oracle.truffle.js.lang.JavaScriptLanguage;
import com.oracle.truffle.js.runtime.interop.JavaScriptLanguageView;
import com.oracle.truffle.js.test.JSTest;

public final class ForeignConsolePrintTest {
    private Context ctx;

    @Before
    public void setup() {
        ctx = JSTest.newContextBuilder().allowHostAccess(HostAccess.ALL).build();
    }

    @After
    public void tearDown() {
        ctx.close();
    }

    @Test
    public void testForeignArray() {
        final String script = "(function (a) { return '' + a; })";
        final Value fun = ctx.eval(JavaScriptLanguage.ID, script);
        Value res = fun.execute(new ArrayTruffleObject(new Object[]{0, 1, 2, 3, 4}));
        String sRes = res.asString();
        assertEquals("0,1,2,3,4", sRes);
    }

    @Test
    public void testToDisplayString() {
        ctx.enter();
        try {
            ctx.initialize(JavaScriptLanguage.ID);
            final ForeignTestMap map = new ForeignTestMap();
            map.getContainer().put("foo", "bar");
            ForeignTestFunction f = new ForeignTestFunction("test", (arg) -> {
                return arg[0] + ", " + arg[1];
            });
            map.getContainer().put("fun", f);

            JavaScriptLanguageView jslv = JavaScriptLanguageView.create(map);
            Object resWithSideEffects = InteropLibrary.getFactory().getUncached(jslv).toDisplayString(jslv, true);
            Object resWithoutSideEffects = InteropLibrary.getFactory().getUncached(jslv).toDisplayString(jslv, false);
            assertEquals("{foo: \"bar\", fun: function test()}", resWithSideEffects);
            assertEquals("{foo: \"bar\", fun: f()}", resWithoutSideEffects);
        } finally {
            ctx.leave();
        }
    }

    @Test
    public void testForeignObject() {
        final String script = "(function (a) { return '' + a; })";
        final Value fun = ctx.eval(JavaScriptLanguage.ID, script);
        final ForeignTestMap map = new ForeignTestMap();
        map.getContainer().put("x", 42);
        map.getContainer().put("y", "foo");

        Value res = fun.execute(map);
        String sRes = res.asString();
        assertEquals("[object Object]", sRes);
    }

    @Test
    public void testForeignArrayWithObjects() {
        final String script = "(function (a) { return '' + a; })";
        final Value fun = ctx.eval(JavaScriptLanguage.ID, script);

        final ForeignTestMap map = new ForeignTestMap();
        map.getContainer().put("x", 42);
        map.getContainer().put("y", "foo");
        ArrayTruffleObject arr = new ArrayTruffleObject(new Object[]{0, "string", map, 3, new ForeignTestFunction("test", (arg) -> {
            return arg[0] + ", " + arg[1];
        })});

        Value res = fun.execute(arr);
        String sRes = res.asString();
        assertEquals("0,string,[object Object],3,function test() { [native code] }", sRes);
    }

    @ExportLibrary(InteropLibrary.class)
    static final class ArrayTruffleObject implements TruffleObject {

        private final Object[] array;

        ArrayTruffleObject(Object[] array) {
            this.array = array;
        }

        @SuppressWarnings("static-method")
        @ExportMessage
        boolean hasArrayElements() {
            return true;
        }

        @ExportMessage
        long getArraySize() {
            return array.length;
        }

        @ExportMessage
        Object readArrayElement(long index) throws UnsupportedMessageException {
            if (!isArrayElementReadable(index)) {
                throw UnsupportedMessageException.create();
            }
            return array[(int) index];
        }

        @ExportMessage
        boolean isArrayElementReadable(long index) {
            return index >= 0 && index < array.length;
        }
    }
}