/*
 * Copyright (c) 2021 Huawei Device Co., Ltd.
 * 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.
 */

/**
 * Provides APIs to implement call chain tracing throughout a service process.
 * With HiTrace, you can quickly obtain the run log for the call chain of a
 * specified service process and locate faults in cross-device, cross-process,
 * or cross-thread communications.
 *
 * @namespace hiTraceChain
 * @syscap SystemCapability.HiviewDFX.HiTrace
 * @since 8
 */
declare namespace hiTraceChain {
  /**
   * Enumerate trace flag
   *
   * @enum { number }
   * @syscap SystemCapability.HiviewDFX.HiTrace
   * @since 8
   */
  enum HiTraceFlag {
    /**
     * Default value
     *
     * @syscap SystemCapability.HiviewDFX.HiTrace
     * @since 8
     */
    DEFAULT = 0,

    /**
     * Trace sync and async call. default: trace sync call only.
     *
     * @syscap SystemCapability.HiviewDFX.HiTrace
     * @since 8
     */
    INCLUDE_ASYNC = 1,

    /**
     * Do not create child span. default: create child span.
     *
     * @syscap SystemCapability.HiviewDFX.HiTrace
     * @since 8
     */
    DONOT_CREATE_SPAN = 1 << 1,

    /**
     * Output tracepoint info in span. default: do not output tracepoint info.
     *
     * @syscap SystemCapability.HiviewDFX.HiTrace
     * @since 8
     */
    TP_INFO = 1 << 2,

    /**
     * Do not output begin and end info. default: output begin and end info.
     *
     * @syscap SystemCapability.HiviewDFX.HiTrace
     * @since 8
     */
    NO_BE_INFO = 1 << 3,

    /**
     * Do not add id to log. default: add id to log.
     *
     * @syscap SystemCapability.HiviewDFX.HiTrace
     * @since 8
     */
    DISABLE_LOG = 1 << 4,

    /**
     * The trace is triggered by fault.
     *
     * @syscap SystemCapability.HiviewDFX.HiTrace
     * @since 8
     */
    FAILURE_TRIGGER = 1 << 5,

    /**
     * Output device-to-device tracepoint info in span only. default: do not output device-to-device tracepoint info.
     *
     * @syscap SystemCapability.HiviewDFX.HiTrace
     * @since 8
     */
    D2D_TP_INFO = 1 << 6
  }

  /**
   * Enumerate trace point type
   *
   * @enum { number }
   * @syscap SystemCapability.HiviewDFX.HiTrace
   * @since 8
   */
  enum HiTraceTracepointType {
    /**
     * Client send
     *
     * @syscap SystemCapability.HiviewDFX.HiTrace
     * @since 8
     */
    CS = 0,

    /**
     * Client receive
     *
     * @syscap SystemCapability.HiviewDFX.HiTrace
     * @since 8
     */
    CR = 1,

    /**
     * Server send
     *
     * @syscap SystemCapability.HiviewDFX.HiTrace
     * @since 8
     */
    SS = 2,

    /**
     * Server receive
     *
     * @syscap SystemCapability.HiviewDFX.HiTrace
     * @since 8
     */
    SR = 3,

    /**
     * General info
     *
     * @syscap SystemCapability.HiviewDFX.HiTrace
     * @since 8
     */
    GENERAL = 4
  }

  /**
   * Enumerate trace communication mode
   *
   * @enum { number }
   * @syscap SystemCapability.HiviewDFX.HiTrace
   * @since 8
   */
  enum HiTraceCommunicationMode {
    /**
     * Unspecified
     *
     * @syscap SystemCapability.HiviewDFX.HiTrace
     * @since 8
     */
    DEFAULT = 0,

    /**
     * Thread-to-thread
     *
     * @syscap SystemCapability.HiviewDFX.HiTrace
     * @since 8
     */
    THREAD = 1,

    /**
     * Process-to-process
     *
     * @syscap SystemCapability.HiviewDFX.HiTrace
     * @since 8
     */
    PROCESS = 2,

    /**
     * Device-to-device
     *
     * @syscap SystemCapability.HiviewDFX.HiTrace
     * @since 8
     */
    DEVICE = 3
  }

  /**
   * Trace id, for tracing process.
   *
   * @interface HiTraceId
   * @syscap SystemCapability.HiviewDFX.HiTrace
   * @since 8
   */
  interface HiTraceId {
    /**
     * Chain id.
     *
     * @type { bigint }
     * @syscap SystemCapability.HiviewDFX.HiTrace
     * @since 8
     */
    chainId: bigint;

    /**
     * Span id.
     *
     * @type { ?number }
     * @syscap SystemCapability.HiviewDFX.HiTrace
     * @since 8
     */
    spanId?: number;

    /**
     * Parent span id.
     *
     * @type { ?number }
     * @syscap SystemCapability.HiviewDFX.HiTrace
     * @since 8
     */
    parentSpanId?: number;

    /**
     * Trace flag.
     *
     * @type { ?number }
     * @syscap SystemCapability.HiviewDFX.HiTrace
     * @since 8
     */
    flags?: number;
  }

  /**
   * Start tracing a process impl.
   *
   * @param { string } name Process name.
   * @param { number } flags Trace function flag.
   * @returns { HiTraceId } Valid if first call, otherwise invalid.
   * @syscap SystemCapability.HiviewDFX.HiTrace
   * @since 8
   */
  function begin(name: string, flags?: number): HiTraceId;

  /**
   * Stop process tracing and clear trace id of current thread if the given trace
   * id is valid, otherwise do nothing.
   *
   * @param { HiTraceId } id The trace id that need to stop.
   * @syscap SystemCapability.HiviewDFX.HiTrace
   * @since 8
   */
  function end(id: HiTraceId): void;

  /**
   * Get trace id of current thread, and return a invalid trace id if no
   * trace id belong to current thread
   *
   * @returns { HiTraceId } Valid if current thread have a trace id, otherwise invalid.
   * @syscap SystemCapability.HiviewDFX.HiTrace
   * @since 8
   */
  function getId(): HiTraceId;

  /**
   * Set id as trace id of current thread. Do nothing if id is invalid.
   *
   * @param { HiTraceId } id Set id as trace id of current thread.
   * @syscap SystemCapability.HiviewDFX.HiTrace
   * @since 8
   */
  function setId(id: HiTraceId): void;

  /**
   * Clear trace id of current thread and set it invalid.
   *
   * @syscap SystemCapability.HiviewDFX.HiTrace
   * @since 8
   */
  function clearId(): void;

  /**
   * Create a new span id according to the trace id of current thread.
   *
   * @returns { HiTraceId } A valid span trace id. Otherwise trace id of current thread if do not allow create span.
   * @syscap SystemCapability.HiviewDFX.HiTrace
   * @since 8
   */
  function createSpan(): HiTraceId;

  /**
   * Print hitrace info, include trace id info.
   *
   * @param { HiTraceCommunicationMode } mode Trace communication mode.
   * @param { HiTraceTracepointType } type Trace info type.
   * @param { HiTraceId } id Trace id that need to print.
   * @param { string } msg Customized info that need to print.
   * @syscap SystemCapability.HiviewDFX.HiTrace
   * @since 8
   */
  function tracepoint(mode: HiTraceCommunicationMode, type: HiTraceTracepointType, id: HiTraceId, msg?: string): void;

  /**
   * Judge whether the trace id is valid or not.
   *
   * @param { HiTraceId } id Trace id that need to judge.
   * @returns { boolean } True for a valid trace id, otherwise false.
   * @syscap SystemCapability.HiviewDFX.HiTrace
   * @since 8
   */
  function isValid(id: HiTraceId): boolean;

  /**
   * Judge whether the trace id has enabled a trace flag or not.
   *
   * @param { HiTraceId } id Trace id that need to judge.
   * @param { HiTraceFlag } flag Trace flag that need to judge.
   * @returns { boolean } true if the trace id has enabled the flag.
   * @syscap SystemCapability.HiviewDFX.HiTrace
   * @since 8
   */
  function isFlagEnabled(id: HiTraceId, flag: HiTraceFlag): boolean;

  /**
   * Enable the designative trace flag for the trace id.
   *
   * @param { HiTraceId } id Trace id that need to enable a flag.
   * @param { HiTraceFlag } flag the designative trace flag that need to be enabled in the trace id.
   * @syscap SystemCapability.HiviewDFX.HiTrace
   * @since 8
   */
  function enableFlag(id: HiTraceId, flag: HiTraceFlag): void;
}

export default hiTraceChain;