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 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
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package com.oracle.truffle.js.nodes.intl;

import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.object.DynamicObject;
import com.oracle.truffle.js.nodes.JSGuards;
import com.oracle.truffle.js.nodes.JavaScriptBaseNode;
import com.oracle.truffle.js.nodes.access.CreateObjectNode.CreateObjectWithPrototypeNode;
import com.oracle.truffle.js.nodes.cast.JSToObjectNode;
import com.oracle.truffle.js.runtime.Errors;
import com.oracle.truffle.js.runtime.JSContext;
import com.oracle.truffle.js.runtime.JSRuntime;
import com.oracle.truffle.js.runtime.builtins.JSOrdinary;
import com.oracle.truffle.js.runtime.objects.JSObject;
import com.oracle.truffle.js.runtime.objects.Undefined;

// https://tc39.github.io/ecma402/#sec-todatetimeoptions
public abstract class ToDateTimeOptionsNode extends JavaScriptBaseNode {

    @Child JSToObjectNode toObjectNode;
    final JSContext context;

    public JSContext getContext() {
        return context;
    }

    public ToDateTimeOptionsNode(JSContext context) {
        super();
        this.context = context;
    }

    public abstract DynamicObject execute(Object opts, String required, String defaults);

    @SuppressWarnings("unused")
    @Specialization(guards = "isUndefined(opts)")
    public DynamicObject fromUndefined(Object opts, String required, String defaults) {
        return setDefaultsIfNeeded(JSOrdinary.createWithNullPrototype(getContext()), required, defaults);
    }

    @Specialization(guards = "!isUndefined(opts)")
    public DynamicObject fromOtherThenUndefined(Object opts, String required, String defaults,
                    @Cached("createOrdinaryWithPrototype(context)") CreateObjectWithPrototypeNode createObjectNode) {
        DynamicObject options = createObjectNode.execute(toDynamicObject(opts));
        return setDefaultsIfNeeded(options, required, defaults);
    }

    // from step 4 (Let needDefaults be true)
    private static DynamicObject setDefaultsIfNeeded(DynamicObject options, String required, String defaults) {
        boolean needDefaults = true;
        if (required != null) {
            if (required.equals("date") || required.equals("any")) {
                needDefaults &= JSGuards.isUndefined(JSObject.get(options, "weekday"));
                needDefaults &= JSGuards.isUndefined(JSObject.get(options, "year"));
                needDefaults &= JSGuards.isUndefined(JSObject.get(options, "month"));
                needDefaults &= JSGuards.isUndefined(JSObject.get(options, "day"));
            }
            if (required.equals("time") || required.equals("any")) {
                needDefaults &= JSGuards.isUndefined(JSObject.get(options, "hour"));
                needDefaults &= JSGuards.isUndefined(JSObject.get(options, "minute"));
                needDefaults &= JSGuards.isUndefined(JSObject.get(options, "second"));
            }
        }
        Object dateStyle = JSObject.get(options, "dateStyle");
        Object timeStyle = JSObject.get(options, "timeStyle");
        if (dateStyle != Undefined.instance || timeStyle != Undefined.instance) {
            needDefaults = false;
        }
        if ("date".equals(required) && timeStyle != Undefined.instance) {
            throw Errors.createTypeError("timeStyle option is not allowed here");
        }
        if ("time".equals(required) && dateStyle != Undefined.instance) {
            throw Errors.createTypeError("dateStyle option is not allowed here");
        }
        if (defaults != null) {
            if (needDefaults && (defaults.equals("date") || defaults.equals("all"))) {
                JSRuntime.createDataPropertyOrThrow(options, "year", "numeric");
                JSRuntime.createDataPropertyOrThrow(options, "month", "numeric");
                JSRuntime.createDataPropertyOrThrow(options, "day", "numeric");
            }
            if (needDefaults && (defaults.equals("time") || defaults.equals("all"))) {
                JSRuntime.createDataPropertyOrThrow(options, "hour", "numeric");
                JSRuntime.createDataPropertyOrThrow(options, "minute", "numeric");
                JSRuntime.createDataPropertyOrThrow(options, "second", "numeric");
            }
        }
        return options;
    }

    private DynamicObject toDynamicObject(Object o) {
        if (toObjectNode == null) {
            CompilerDirectives.transferToInterpreterAndInvalidate();
            toObjectNode = insert(JSToObjectNode.createToObject(getContext()));
        }
        return (DynamicObject) toObjectNode.execute(o);
    }
}