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

import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.interop.InteropLibrary;
import com.oracle.truffle.api.object.DynamicObject;
import com.oracle.truffle.js.nodes.JavaScriptBaseNode;
import com.oracle.truffle.js.nodes.control.TryCatchNode;
import com.oracle.truffle.js.nodes.function.JSFunctionCallNode;
import com.oracle.truffle.js.runtime.JSArguments;
import com.oracle.truffle.js.runtime.JSConfig;
import com.oracle.truffle.js.runtime.JSContext;
import com.oracle.truffle.js.runtime.objects.Undefined;
import com.oracle.truffle.js.runtime.util.Pair;

public class PromiseResolveThenableNode extends JavaScriptBaseNode {
    private final JSContext context;
    @Child private CreateResolvingFunctionNode createResolvingFunctions;
    @Child private JSFunctionCallNode callResolveNode;
    @Child private JSFunctionCallNode callRejectNode;
    @Child private TryCatchNode.GetErrorObjectNode getErrorObjectNode;
    @Child private InteropLibrary exceptions;

    protected PromiseResolveThenableNode(JSContext context) {
        this.context = context;
        this.createResolvingFunctions = CreateResolvingFunctionNode.create(context);
        this.callResolveNode = JSFunctionCallNode.createCall();
    }

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

    public Object execute(DynamicObject promiseToResolve, Object thenable, Object then) {
        Pair<DynamicObject, DynamicObject> resolvingFunctions = createResolvingFunctions.execute(promiseToResolve);
        DynamicObject resolve = resolvingFunctions.getFirst();
        DynamicObject reject = resolvingFunctions.getSecond();
        try {
            return callResolveNode.executeCall(JSArguments.create(thenable, then, resolve, reject));
        } catch (Throwable ex) {
            if (shouldCatch(ex)) {
                return callReject().executeCall(JSArguments.create(Undefined.instance, reject, getErrorObjectNode.execute(ex)));
            } else {
                throw ex;
            }
        }
    }

    private boolean shouldCatch(Throwable exception) {
        if (getErrorObjectNode == null || exceptions == null) {
            CompilerDirectives.transferToInterpreterAndInvalidate();
            getErrorObjectNode = insert(TryCatchNode.GetErrorObjectNode.create(context));
            exceptions = insert(InteropLibrary.getFactory().createDispatched(JSConfig.InteropLibraryLimit));
        }
        return TryCatchNode.shouldCatch(exception, exceptions);
    }

    private JSFunctionCallNode callReject() {
        if (callRejectNode == null) {
            CompilerDirectives.transferToInterpreterAndInvalidate();
            callRejectNode = insert(JSFunctionCallNode.createCall());
        }
        return callRejectNode;
    }
}