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

import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.nodes.UnexpectedResultException;
import com.oracle.truffle.api.object.DynamicObject;
import com.oracle.truffle.api.profiles.BranchProfile;
import com.oracle.truffle.api.profiles.ConditionProfile;
import com.oracle.truffle.js.nodes.JavaScriptBaseNode;
import com.oracle.truffle.js.nodes.access.PropertyGetNode;
import com.oracle.truffle.js.nodes.access.PropertySetNode;
import com.oracle.truffle.js.nodes.unary.IsCallableNode;
import com.oracle.truffle.js.runtime.Errors;
import com.oracle.truffle.js.runtime.JSContext;
import com.oracle.truffle.js.runtime.builtins.JSPromise;
import com.oracle.truffle.js.runtime.objects.PromiseCapabilityRecord;
import com.oracle.truffle.js.runtime.objects.PromiseReactionRecord;
import com.oracle.truffle.js.runtime.objects.Undefined;
import com.oracle.truffle.js.runtime.util.SimpleArrayList;

public class PerformPromiseThenNode extends JavaScriptBaseNode {
    private final JSContext context;
    @Child private IsCallableNode isCallableFulfillNode = IsCallableNode.create();
    @Child private IsCallableNode isCallableRejectNode = IsCallableNode.create();
    @Child private PropertyGetNode getPromiseFulfillReactionsNode;
    @Child private PropertyGetNode getPromiseRejectReactionsNode;
    @Child private PropertyGetNode getPromiseResultNode;
    @Child private PropertyGetNode getPromiseIsHandledNode;
    @Child private PropertySetNode setPromiseIsHandledNode;
    @Child private PromiseReactionJobNode promiseReactionJobNode;
    private final ConditionProfile pendingProf = ConditionProfile.createBinaryProfile();
    private final ConditionProfile fulfilledProf = ConditionProfile.createBinaryProfile();
    private final ConditionProfile unhandledProf = ConditionProfile.createBinaryProfile();
    private final BranchProfile growProfile = BranchProfile.create();

    protected PerformPromiseThenNode(JSContext context) {
        this.context = context;
        this.getPromiseFulfillReactionsNode = PropertyGetNode.createGetHidden(JSPromise.PROMISE_FULFILL_REACTIONS, context);
        this.getPromiseRejectReactionsNode = PropertyGetNode.createGetHidden(JSPromise.PROMISE_REJECT_REACTIONS, context);
        this.setPromiseIsHandledNode = PropertySetNode.createSetHidden(JSPromise.PROMISE_IS_HANDLED, context);
    }

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

    @SuppressWarnings("unchecked")
    public DynamicObject execute(DynamicObject promise, Object onFulfilled, Object onRejected, PromiseCapabilityRecord resultCapability) {
        assert JSPromise.isJSPromise(promise);
        Object onFulfilledHandler = isCallableFulfillNode.executeBoolean(onFulfilled) ? onFulfilled : Undefined.instance;
        Object onRejectedHandler = isCallableRejectNode.executeBoolean(onRejected) ? onRejected : Undefined.instance;
        assert resultCapability != null || (onFulfilledHandler != Undefined.instance && onRejectedHandler != Undefined.instance);
        PromiseReactionRecord fulfillReaction = PromiseReactionRecord.create(resultCapability, onFulfilledHandler, true);
        PromiseReactionRecord rejectReaction = PromiseReactionRecord.create(resultCapability, onRejectedHandler, false);

        int promiseState = JSPromise.getPromiseState(promise);
        if (pendingProf.profile(promiseState == JSPromise.PENDING)) {
            ((SimpleArrayList<? super PromiseReactionRecord>) getPromiseFulfillReactionsNode.getValue(promise)).add(fulfillReaction, growProfile);
            ((SimpleArrayList<? super PromiseReactionRecord>) getPromiseRejectReactionsNode.getValue(promise)).add(rejectReaction, growProfile);
        } else if (fulfilledProf.profile(promiseState == JSPromise.FULFILLED)) {
            Object value = getPromiseResult(promise);
            DynamicObject job = getPromiseReactionJob(fulfillReaction, value);
            context.promiseEnqueueJob(context.getRealm(), job);
        } else {
            assert promiseState == JSPromise.REJECTED;
            Object reason = getPromiseResult(promise);
            if (unhandledProf.profile(!getPromiseIsHandled(promise))) {
                context.notifyPromiseRejectionTracker(promise, JSPromise.REJECTION_TRACKER_OPERATION_HANDLE, Undefined.instance);
            }
            DynamicObject job = getPromiseReactionJob(rejectReaction, reason);
            context.promiseEnqueueJob(context.getRealm(), job);
        }
        setPromiseIsHandledNode.setValueBoolean(promise, true);
        if (resultCapability == null) {
            return Undefined.instance;
        }
        return resultCapability.getPromise();
    }

    private DynamicObject getPromiseReactionJob(PromiseReactionRecord reaction, Object value) {
        if (promiseReactionJobNode == null) {
            CompilerDirectives.transferToInterpreterAndInvalidate();
            promiseReactionJobNode = insert(PromiseReactionJobNode.create(context));
        }
        return promiseReactionJobNode.execute(reaction, value);
    }

    private Object getPromiseResult(DynamicObject promise) {
        if (getPromiseResultNode == null) {
            CompilerDirectives.transferToInterpreterAndInvalidate();
            getPromiseResultNode = insert(PropertyGetNode.createGetHidden(JSPromise.PROMISE_RESULT, context));
        }
        return getPromiseResultNode.getValue(promise);
    }

    private boolean getPromiseIsHandled(DynamicObject promise) {
        try {
            if (getPromiseIsHandledNode == null) {
                CompilerDirectives.transferToInterpreterAndInvalidate();
                getPromiseIsHandledNode = insert(PropertyGetNode.createGetHidden(JSPromise.PROMISE_IS_HANDLED, context));
            }
            return getPromiseIsHandledNode.getValueBoolean(promise);
        } catch (UnexpectedResultException e) {
            throw Errors.shouldNotReachHere();
        }
    }
}