/*
 * Copyright (C) 2019 The Android Open Source Project
 *
 * 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.
 */

#ifndef SRC_TRACE_PROCESSOR_IMPORTERS_PROTO_SYSTEM_PROBES_PARSER_H_
#define SRC_TRACE_PROCESSOR_IMPORTERS_PROTO_SYSTEM_PROBES_PARSER_H_

#include <array>
#include <set>
#include <vector>

#include "perfetto/protozero/field.h"
#include "protos/perfetto/trace/sys_stats/sys_stats.pbzero.h"
#include "src/trace_processor/storage/trace_storage.h"

namespace perfetto {
namespace trace_processor {

class TraceProcessorContext;

class SystemProbesParser {
 public:
  using ConstBytes = protozero::ConstBytes;
  using ConstChars = protozero::ConstChars;

  explicit SystemProbesParser(TraceProcessorContext*);

  void ParseProcessTree(ConstBytes);
  void ParseProcessStats(int64_t timestamp, ConstBytes);
  void ParseSysStats(int64_t ts, ConstBytes);
  void ParseSystemInfo(ConstBytes);
  void ParseCpuInfo(ConstBytes);

 private:
  void ParseThreadStats(int64_t timestamp, uint32_t pid, ConstBytes);
  void ParseDiskStats(int64_t ts, ConstBytes blob);
  void ParseProcessFds(int64_t ts, uint32_t pid, ConstBytes);

  TraceProcessorContext* const context_;

  const StringId utid_name_id_;
  const StringId num_forks_name_id_;
  const StringId num_irq_total_name_id_;
  const StringId num_softirq_total_name_id_;
  const StringId num_irq_name_id_;
  const StringId num_softirq_name_id_;
  const StringId cpu_times_user_ns_id_;
  const StringId cpu_times_user_nice_ns_id_;
  const StringId cpu_times_system_mode_ns_id_;
  const StringId cpu_times_idle_ns_id_;
  const StringId cpu_times_io_wait_ns_id_;
  const StringId cpu_times_irq_ns_id_;
  const StringId cpu_times_softirq_ns_id_;
  const StringId oom_score_adj_id_;
  const StringId cpu_freq_id_;
  std::vector<StringId> meminfo_strs_id_;
  std::vector<StringId> vmstat_strs_id_;

  // Maps a proto field number for memcounters in ProcessStats::Process to
  // their StringId. Keep kProcStatsProcessSize equal to 1 + max proto field
  // id of ProcessStats::Process. Also update the value in
  // ChromeSystemProbesParser.
  static constexpr size_t kProcStatsProcessSize = 21;
  std::array<StringId, kProcStatsProcessSize> proc_stats_process_names_{};

  // Maps a SysStats::PsiSample::PsiResource type to its StringId.
  std::array<StringId, protos::pbzero::SysStats_PsiSample_PsiResource_MAX + 1>
      sys_stats_psi_resource_names_{};

  uint64_t ms_per_tick_ = 0;
  uint32_t page_size_ = 0;

  int64_t prev_read_amount = -1;
  int64_t prev_write_amount = -1;
  int64_t prev_discard_amount = -1;
  int64_t prev_flush_count = -1;
  int64_t prev_read_time = -1;
  int64_t prev_write_time = -1;
  int64_t prev_discard_time = -1;
  int64_t prev_flush_time = -1;
};

}  // namespace trace_processor
}  // namespace perfetto

#endif  // SRC_TRACE_PROCESSOR_IMPORTERS_PROTO_SYSTEM_PROBES_PARSER_H_
