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package com.oracle.truffle.js.runtime.builtins;

import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
import com.oracle.truffle.api.object.DynamicObject;
import com.oracle.truffle.api.object.Shape;
import com.oracle.truffle.js.builtins.NumberFunctionBuiltins;
import com.oracle.truffle.js.builtins.NumberPrototypeBuiltins;
import com.oracle.truffle.js.runtime.JSContext;
import com.oracle.truffle.js.runtime.JSRealm;
import com.oracle.truffle.js.runtime.JSRuntime;
import com.oracle.truffle.js.runtime.objects.JSObjectUtil;
import com.oracle.truffle.js.runtime.objects.JSShape;

public final class JSNumber extends JSPrimitive implements JSConstructorFactory.Default.WithFunctions {

    public static final String TYPE_NAME = "number";
    public static final String CLASS_NAME = "Number";
    public static final String PROTOTYPE_NAME = "Number.prototype";

    public static final JSNumber INSTANCE = new JSNumber();

    private static final double NUMBER_EPSILON = 2.220446049250313e-16;
    private static final double MAX_SAFE_INTEGER = 9007199254740991d;
    private static final double MIN_SAFE_INTEGER = -9007199254740991d;

    private JSNumber() {
    }

    public static DynamicObject create(JSContext context, Number value) {
        DynamicObject obj = JSNumberObject.create(context.getRealm(), context.getNumberFactory(), value);
        assert isJSNumber(obj);
        return context.trackAllocation(obj);
    }

    private static Number getNumberField(DynamicObject obj) {
        assert isJSNumber(obj);
        return ((JSNumberObject) obj).getNumber();
    }

    public static Number valueOf(DynamicObject obj) {
        return getNumberField(obj);
    }

    @Override
    public DynamicObject createPrototype(JSRealm realm, DynamicObject ctor) {
        JSContext context = realm.getContext();
        Shape protoShape = JSShape.createPrototypeShape(realm.getContext(), INSTANCE, realm.getObjectPrototype());
        DynamicObject numberPrototype = JSNumberObject.create(protoShape, 0);
        JSObjectUtil.setOrVerifyPrototype(context, numberPrototype, realm.getObjectPrototype());

        JSObjectUtil.putConstructorProperty(context, numberPrototype, ctor);
        JSObjectUtil.putFunctionsFromContainer(realm, numberPrototype, NumberPrototypeBuiltins.BUILTINS);
        return numberPrototype;
    }

    @Override
    public Shape makeInitialShape(JSContext context, DynamicObject prototype) {
        Shape initialShape = JSObjectUtil.getProtoChildShape(prototype, INSTANCE, context);
        return initialShape;
    }

    @Override
    public void fillConstructor(JSRealm realm, DynamicObject constructor) {
        WithFunctions.super.fillConstructor(realm, constructor);

        JSContext context = realm.getContext();
        JSObjectUtil.putDataProperty(context, constructor, JSRuntime.NAN_STRING, Double.NaN);
        JSObjectUtil.putDataProperty(context, constructor, "POSITIVE_INFINITY", Double.POSITIVE_INFINITY);
        JSObjectUtil.putDataProperty(context, constructor, "NEGATIVE_INFINITY", Double.NEGATIVE_INFINITY);
        JSObjectUtil.putDataProperty(context, constructor, "MAX_VALUE", Double.MAX_VALUE);
        JSObjectUtil.putDataProperty(context, constructor, "MIN_VALUE", Double.MIN_VALUE);
        if (context.getEcmaScriptVersion() >= 6) {
            JSObjectUtil.putDataProperty(context, constructor, "EPSILON", NUMBER_EPSILON);
            JSObjectUtil.putDataProperty(context, constructor, "MAX_SAFE_INTEGER", MAX_SAFE_INTEGER);
            JSObjectUtil.putDataProperty(context, constructor, "MIN_SAFE_INTEGER", MIN_SAFE_INTEGER);
        }
    }

    public static JSConstructor createConstructor(JSRealm realm) {
        return INSTANCE.createConstructorAndPrototype(realm, NumberFunctionBuiltins.BUILTINS);
    }

    public static boolean isJSNumber(Object obj) {
        return obj instanceof JSNumberObject;
    }

    @Override
    public String getClassName() {
        return CLASS_NAME;
    }

    @Override
    public String getClassName(DynamicObject object) {
        return getClassName();
    }

    @Override
    public String getBuiltinToStringTag(DynamicObject object) {
        return getClassName(object);
    }

    @TruffleBoundary
    @Override
    public String toDisplayStringImpl(DynamicObject obj, int depth, boolean allowSideEffects, JSContext context) {
        if (context.isOptionNashornCompatibilityMode()) {
            return super.toDisplayStringImpl(obj, depth, allowSideEffects, context);
        } else {
            Number primitiveValue = JSNumber.valueOf(obj);
            return JSRuntime.objectToConsoleString(obj, getBuiltinToStringTag(obj), depth,
                            new String[]{JSRuntime.PRIMITIVE_VALUE}, new Object[]{primitiveValue}, allowSideEffects);
        }
    }

    @Override
    public DynamicObject getIntrinsicDefaultProto(JSRealm realm) {
        return realm.getNumberPrototype();
    }
}