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package com.oracle.truffle.js.nodes.promise;

import com.oracle.truffle.api.object.DynamicObject;
import com.oracle.truffle.js.nodes.access.PropertyGetNode;
import com.oracle.truffle.js.nodes.function.JSFunctionCallNode;
import com.oracle.truffle.js.runtime.JSArguments;
import com.oracle.truffle.js.runtime.JSContext;
import com.oracle.truffle.js.runtime.JSRuntime;
import com.oracle.truffle.js.runtime.builtins.JSPromise;
import com.oracle.truffle.js.runtime.objects.IteratorRecord;
import com.oracle.truffle.js.runtime.objects.PromiseCapabilityRecord;

public class PerformPromiseRaceNode extends PerformPromiseCombinatorNode {

    @Child private JSFunctionCallNode callResolve;
    @Child private PropertyGetNode getThen;
    @Child private JSFunctionCallNode callThen;

    protected PerformPromiseRaceNode(JSContext context) {
        super(context);
        this.callResolve = JSFunctionCallNode.createCall();
        this.getThen = PropertyGetNode.create(JSPromise.THEN, false, context);
        this.callThen = JSFunctionCallNode.createCall();
    }

    public static PerformPromiseRaceNode create(JSContext context) {
        return new PerformPromiseRaceNode(context);
    }

    @Override
    public DynamicObject execute(IteratorRecord iteratorRecord, DynamicObject constructor, PromiseCapabilityRecord resultCapability, Object promiseResolve) {
        assert JSRuntime.isConstructor(constructor);
        assert JSRuntime.isCallable(promiseResolve);
        for (;;) {
            Object next = iteratorStepOrSetDone(iteratorRecord);
            if (next == Boolean.FALSE) {
                iteratorRecord.setDone(true);
                return resultCapability.getPromise();
            }
            Object nextValue = iteratorValueOrSetDone(iteratorRecord, next);
            Object nextPromise = callResolve.executeCall(JSArguments.createOneArg(constructor, promiseResolve, nextValue));
            callThen.executeCall(JSArguments.create(nextPromise, getThen.getValue(nextPromise), resultCapability.getResolve(), resultCapability.getReject()));
        }
    }
}