/**
 * Copyright (c) 2015-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */

package com.facebook.react.bridge.queue;

import android.os.Build;

import javax.annotation.Nullable;

import com.facebook.infer.annotation.Assertions;

/**
 * Spec for creating a ReactQueueConfiguration. This exists so that CatalystInstance is able to
 * set Exception handlers on the MessageQueueThreads it uses and it would not be super clean if the
 * threads were configured, then passed to CatalystInstance where they are configured more. These
 * specs allows the Threads to be created fully configured.
 */
public class ReactQueueConfigurationSpec {

  private static final long LEGACY_STACK_SIZE_BYTES = 2000000;

  private final @Nullable MessageQueueThreadSpec mUIBackgroundQueueThreadSpec;
  private final MessageQueueThreadSpec mNativeModulesQueueThreadSpec;
  private final MessageQueueThreadSpec mJSQueueThreadSpec;

  private ReactQueueConfigurationSpec(
    @Nullable MessageQueueThreadSpec uiBackgroundQueueThreadSpec,
    MessageQueueThreadSpec nativeModulesQueueThreadSpec,
    MessageQueueThreadSpec jsQueueThreadSpec) {
    mUIBackgroundQueueThreadSpec = uiBackgroundQueueThreadSpec;
    mNativeModulesQueueThreadSpec = nativeModulesQueueThreadSpec;
    mJSQueueThreadSpec = jsQueueThreadSpec;
  }

  public @Nullable MessageQueueThreadSpec getUIBackgroundQueueThreadSpec() {
    return mUIBackgroundQueueThreadSpec;
  }

  public MessageQueueThreadSpec getNativeModulesQueueThreadSpec() {
    return mNativeModulesQueueThreadSpec;
  }

  public MessageQueueThreadSpec getJSQueueThreadSpec() {
    return mJSQueueThreadSpec;
  }

  public static Builder builder() {
    return new Builder();
  }

  public static ReactQueueConfigurationSpec createDefault() {
    MessageQueueThreadSpec spec = Build.VERSION.SDK_INT < 21 ?
        MessageQueueThreadSpec.newBackgroundThreadSpec("native_modules", LEGACY_STACK_SIZE_BYTES) :
        MessageQueueThreadSpec.newBackgroundThreadSpec("native_modules");
    return builder()
        .setJSQueueThreadSpec(MessageQueueThreadSpec.newBackgroundThreadSpec("js"))
        .setNativeModulesQueueThreadSpec(spec)
        .build();
  }

  public static ReactQueueConfigurationSpec createWithSeparateUIBackgroundThread() {
    MessageQueueThreadSpec spec = Build.VERSION.SDK_INT < 21 ?
      MessageQueueThreadSpec.newBackgroundThreadSpec("native_modules", LEGACY_STACK_SIZE_BYTES) :
      MessageQueueThreadSpec.newBackgroundThreadSpec("native_modules");
    return builder()
      .setJSQueueThreadSpec(MessageQueueThreadSpec.newBackgroundThreadSpec("js"))
      .setNativeModulesQueueThreadSpec(spec)
      .setUIBackgroundQueueThreadSpec(
        MessageQueueThreadSpec.newUIBackgroundTreadSpec("ui_background"))
      .build();
  }

  public static class Builder {

    private @Nullable MessageQueueThreadSpec mUIBackgroundQueueSpec;
    private @Nullable MessageQueueThreadSpec mNativeModulesQueueSpec;
    private @Nullable MessageQueueThreadSpec mJSQueueSpec;

    public Builder setUIBackgroundQueueThreadSpec(MessageQueueThreadSpec spec) {
      Assertions.assertCondition(
        mUIBackgroundQueueSpec == null,
        "Setting UI background queue multiple times!");
      mUIBackgroundQueueSpec = spec;
      return this;
    }

    public Builder setNativeModulesQueueThreadSpec(MessageQueueThreadSpec spec) {
      Assertions.assertCondition(
        mNativeModulesQueueSpec == null,
        "Setting native modules queue spec multiple times!");
      mNativeModulesQueueSpec = spec;
      return this;
    }

    public Builder setJSQueueThreadSpec(MessageQueueThreadSpec spec) {
      Assertions.assertCondition(mJSQueueSpec == null, "Setting JS queue multiple times!");
      mJSQueueSpec = spec;
      return this;
    }

    public ReactQueueConfigurationSpec build() {
      return new ReactQueueConfigurationSpec(
        mUIBackgroundQueueSpec,
        Assertions.assertNotNull(mNativeModulesQueueSpec),
        Assertions.assertNotNull(mJSQueueSpec));
    }
  }
}