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

import static com.oracle.truffle.js.lang.JavaScriptLanguage.ID;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

import java.util.Collections;
import java.util.Map;
import java.util.Set;

import org.graalvm.polyglot.Context;
import org.graalvm.polyglot.HostAccess;
import org.graalvm.polyglot.Value;
import org.graalvm.polyglot.proxy.ProxyExecutable;
import org.graalvm.polyglot.proxy.ProxyObject;
import org.junit.Test;

import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
import com.oracle.truffle.api.TruffleLanguage;
import com.oracle.truffle.api.dsl.CachedContext;
import com.oracle.truffle.api.interop.InteropLibrary;
import com.oracle.truffle.api.interop.TruffleObject;
import com.oracle.truffle.api.interop.UnknownIdentifierException;
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.JSRealm;
import com.oracle.truffle.js.test.JSTest;

public class JSONStringifyInteropTest {

    @Test
    public void testForeignExecutable() {
        try (Context context = JSTest.newContextBuilder().allowAllAccess(true).build()) {
            Value result = context.eval(ID, "JSON.stringify(java.lang.Class.forName) === undefined");
            assertTrue(result.isBoolean());
            assertTrue(result.asBoolean());

            result = context.eval(ID, "JSON.stringify([java.lang.Class.forName])");
            assertTrue(result.isString());
            assertEquals("[null]", result.asString());

            result = context.eval(ID, "JSON.stringify(new java.awt.Point(42, 211))");
            assertTrue(result.isString());
            assertEquals("{\"x\":42,\"y\":211}", result.asString());
        }
    }

    private static void checkStringification(Object objectToStringify, String expectedResult) {
        try (Context context = JSTest.newContextBuilder().allowHostAccess(HostAccess.ALL).build()) {
            context.getBindings(ID).putMember("objectToStringify", objectToStringify);
            Value result = context.eval(ID, "JSON.stringify(objectToStringify)");
            assertEquals(expectedResult, result.asString());
        }
    }

    @Test
    public void testNonReadableMembers() {
        checkStringification(new InvocableMemberObject(Collections.singletonMap("someKey", "someValue")), "{}");
    }

    @Test
    public void testToJSONOfProxyObject() {
        Object object = ProxyObject.fromMap(Collections.singletonMap("toJSON", new ProxyExecutable() {
            @Override
            public Object execute(Value... arguments) {
                return "fromToJSON";
            }
        }));
        checkStringification(object, "\"fromToJSON\"");
    }

    @Test
    public void testToJSONOfHostObject() {
        checkStringification(new HostObjectWithToJSON(), "\"HostObjectWithToJSON\"");
    }

    public static class HostObjectWithToJSON {
        public Object toJSON(@SuppressWarnings("unused") String key) {
            return "HostObjectWithToJSON";
        }
    }

    @ExportLibrary(InteropLibrary.class)
    public static class InvocableMemberObject implements TruffleObject {
        private final Map<String, Object> invocables;

        public InvocableMemberObject(Map<String, Object> invocables) {
            this.invocables = invocables;
        }

        @ExportMessage
        public boolean hasMembers() {
            return true;
        }

        @SuppressWarnings("static-method")
        @ExportMessage
        @TruffleBoundary
        final Object readMember(@SuppressWarnings("unused") String key) throws UnsupportedMessageException {
            throw UnsupportedMessageException.create();
        }

        @ExportMessage
        @TruffleBoundary
        final Object invokeMember(String key, @SuppressWarnings("unused") Object[] args) throws UnknownIdentifierException {
            if (invocables.containsKey(key)) {
                return invocables.get(key);
            } else {
                throw UnknownIdentifierException.create(key);
            }
        }

        @ExportMessage
        @TruffleBoundary
        final boolean isMemberInvocable(String key) {
            if (invocables.containsKey(key)) {
                return true;
            } else {
                return false;
            }
        }

        @TruffleBoundary
        final boolean isMemberExisting(String key) {
            return invocables.containsKey(key);
        }

        @SuppressWarnings("static-method")
        @ExportMessage
        @TruffleBoundary
        final boolean isMemberReadable(@SuppressWarnings("unused") String key) {
            return false;
        }

        @ExportMessage
        @TruffleBoundary
        final Object getMembers(@SuppressWarnings("unused") boolean includeInternal,
                        @CachedContext(JavaScriptLanguage.class) JSRealm realm) {
            Set<String> keys = invocables.keySet();
            TruffleLanguage.Env env = realm.getEnv();
            return env.asGuestValue(keys.toArray(new Object[keys.size()]));
        }
    }
}