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// Copyright 2016 Google Inc. All rights reserved.
//
// 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 com.google.cloud.trace;

import com.google.cloud.trace.core.SpanContext;
import com.google.cloud.trace.core.SpanContextHandle;
import com.google.cloud.trace.core.SpanId;
import com.google.cloud.trace.core.TraceId;
import com.google.cloud.trace.core.TraceOptions;
import java.math.BigInteger;

public class TestSpanContextHandler implements SpanContextHandler {
  public static final SpanContext TEST_CONTEXT = new SpanContext(
      new TraceId(BigInteger.TEN),
      new SpanId(500),
      TraceOptions.forTraceEnabled());

  private SpanContext currentContext;

  public TestSpanContextHandler() {
    this(TEST_CONTEXT);
  }

  public TestSpanContextHandler(SpanContext context) {
    this.currentContext = context;
  }

  @Override
  public SpanContext current() {
    return currentContext;
  }

  @Override
  public SpanContextHandle attach(SpanContext context) {
    SpanContext temp = currentContext;
    this.currentContext = context;
    return new TestSpanContextHandle(this, currentContext, temp);
  }

  private void detach(SpanContext toAttach) {
    this.currentContext = toAttach;
  }

  private static class TestSpanContextHandle implements SpanContextHandle {
    private TestSpanContextHandler handler;
    private SpanContext current, previous;

    public TestSpanContextHandle(TestSpanContextHandler handler,
        SpanContext current, SpanContext previous) {
      this.handler = handler;
      this.current = current;
      this.previous = previous;
    }

    @Override
    public SpanContext getCurrentSpanContext() {
      return current;
    }

    @Override
    public void detach() {
      handler.detach(previous);
    }
  }
}