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 * (a) the Software, and
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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.builtins;

import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.js.builtins.IteratorFunctionBuiltinsFactory.JSIteratorFromNodeGen;
import com.oracle.truffle.js.nodes.access.GetIteratorFlattenableNode;
import com.oracle.truffle.js.nodes.binary.InstanceofNode.OrdinaryHasInstanceNode;
import com.oracle.truffle.js.nodes.function.JSBuiltin;
import com.oracle.truffle.js.nodes.function.JSBuiltinNode;
import com.oracle.truffle.js.runtime.JSContext;
import com.oracle.truffle.js.runtime.JSRealm;
import com.oracle.truffle.js.runtime.builtins.BuiltinEnum;
import com.oracle.truffle.js.runtime.builtins.JSIterator;
import com.oracle.truffle.js.runtime.builtins.JSWrapForValidIterator;
import com.oracle.truffle.js.runtime.objects.IteratorRecord;

/**
 * Contains builtins for {@linkplain JSIterator} function (constructor).
 */
public final class IteratorFunctionBuiltins extends JSBuiltinsContainer.SwitchEnum {

    public static final JSBuiltinsContainer BUILTINS = new IteratorFunctionBuiltins();

    IteratorFunctionBuiltins() {
        super(JSIterator.CLASS_NAME, IteratorFunction.class);
    }

    public enum IteratorFunction implements BuiltinEnum {
        from(1);

        private final int length;

        IteratorFunction(int length) {
            this.length = length;
        }

        @Override
        public int getLength() {
            return length;
        }
    }

    @Override
    protected Object createNode(JSContext context, JSBuiltin builtin, boolean construct, boolean newTarget, IteratorFunction builtinEnum) {
        switch (builtinEnum) {
            case from:
                return JSIteratorFromNodeGen.create(context, builtin, args().fixedArgs(1).createArgumentNodes(context));
        }

        return null;
    }

    public abstract static class JSIteratorFromNode extends JSBuiltinNode {
        @Child private GetIteratorFlattenableNode getIteratorFlattenableNode;

        @Child private OrdinaryHasInstanceNode ordinaryHasInstanceNode;

        public JSIteratorFromNode(JSContext context, JSBuiltin builtin) {
            super(context, builtin);
            this.getIteratorFlattenableNode = GetIteratorFlattenableNode.create(false, false, context);
            this.ordinaryHasInstanceNode = OrdinaryHasInstanceNode.create(context);
        }

        @Specialization
        protected Object iteratorFrom(Object arg) {
            IteratorRecord iteratorRecord = getIteratorFlattenableNode.execute(arg);

            JSRealm realm = getRealm();
            boolean hasInstance = ordinaryHasInstanceNode.executeBoolean(iteratorRecord.getIterator(), realm.getIteratorConstructor());
            if (hasInstance) {
                return iteratorRecord.getIterator();
            }

            return JSWrapForValidIterator.create(getContext(), realm, iteratorRecord);
        }

    }
}