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/*
 * Copyright (c) 2022, 2024 Oracle and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.helidon.tracing.providers.opentelemetry;

import java.util.List;
import java.util.concurrent.atomic.AtomicBoolean;

import io.helidon.tracing.Scope;
import io.helidon.tracing.SpanListener;

class OpenTelemetryScope implements Scope {
    private static final System.Logger LOGGER = System.getLogger(OpenTelemetryScope.class.getName());
    private final OpenTelemetrySpan span;
    private final io.opentelemetry.context.Scope delegate;
    private final AtomicBoolean closed = new AtomicBoolean();
    private final List spanListeners;
    private Limited limited;

    OpenTelemetryScope(OpenTelemetrySpan span,
                       io.opentelemetry.context.Scope scope,
                       List spanListeners) {
        this.span = span;
        delegate = scope;
        this.spanListeners = spanListeners;
    }

    @Override
    public void close() {
        if (closed.compareAndSet(false, true) && delegate != null) {
            delegate.close();
            HelidonOpenTelemetry.invokeListeners(spanListeners, LOGGER, listener -> listener.closed(span.limited(), limited()));
        }
    }

    @Override
    public boolean isClosed() {
        return closed.get();
    }

    Limited limited() {
        if (limited !=  null) {
            return limited;
        }
        if (spanListeners.isEmpty()) {
            return null;
        }
        limited = new Limited(this);
        return limited;
    }

    private record Limited(OpenTelemetryScope delegate) implements Scope {

        @Override
        public void close() {
            throw new SpanListener.ForbiddenOperationException();
        }

        @Override
        public boolean isClosed() {
            return delegate.isClosed();
        }
    }
}