/*
 * Copyright (C) 2015 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.
 */

#include <inttypes.h>

#include <map>
#include <string>
#include <vector>

#include <android-base/logging.h>
#include <android-base/stringprintf.h>
#include <android-base/strings.h>

#include "command.h"
#include "event_attr.h"
#include "perf_regs.h"
#include "record.h"
#include "record_file.h"
#include "utils.h"

using namespace PerfFileFormat;

class DumpRecordCommand : public Command {
 public:
  DumpRecordCommand()
      : Command("dump", "dump perf record file",
                "Usage: simpleperf dumprecord [options] [perf_record_file]\n"
                "    Dump different parts of a perf record file. Default file is perf.data.\n"),
        record_filename_("perf.data"), record_file_arch_(GetBuildArch()) {
  }

  bool Run(const std::vector<std::string>& args);

 private:
  bool ParseOptions(const std::vector<std::string>& args);
  void DumpFileHeader();
  void DumpAttrSection();
  void DumpDataSection();
  void DumpFeatureSection();

  std::string record_filename_;
  std::unique_ptr<RecordFileReader> record_file_reader_;
  ArchType record_file_arch_;
};

bool DumpRecordCommand::Run(const std::vector<std::string>& args) {
  if (!ParseOptions(args)) {
    return false;
  }
  record_file_reader_ = RecordFileReader::CreateInstance(record_filename_);
  if (record_file_reader_ == nullptr) {
    return false;
  }
  std::string arch = record_file_reader_->ReadFeatureString(FEAT_ARCH);
  if (!arch.empty()) {
    record_file_arch_ = GetArchType(arch);
    if (record_file_arch_ == ARCH_UNSUPPORTED) {
      return false;
    }
  }
  ScopedCurrentArch scoped_arch(record_file_arch_);
  DumpFileHeader();
  DumpAttrSection();
  DumpDataSection();
  DumpFeatureSection();

  return true;
}

bool DumpRecordCommand::ParseOptions(const std::vector<std::string>& args) {
  if (args.size() == 1) {
    record_filename_ = args[0];
  } else if (args.size() > 1) {
    ReportUnknownOption(args, 1);
    return false;
  }
  return true;
}

static const std::string GetFeatureName(int feature);

void DumpRecordCommand::DumpFileHeader() {
  const FileHeader& header = record_file_reader_->FileHeader();
  printf("magic: ");
  for (size_t i = 0; i < 8; ++i) {
    printf("%c", header.magic[i]);
  }
  printf("\n");
  printf("header_size: %" PRId64 "\n", header.header_size);
  if (header.header_size != sizeof(header)) {
    PLOG(WARNING) << "record file header size " << header.header_size
                  << "doesn't match expected header size " << sizeof(header);
  }
  printf("attr_size: %" PRId64 "\n", header.attr_size);
  if (header.attr_size != sizeof(FileAttr)) {
    PLOG(WARNING) << "record file attr size " << header.attr_size
                  << " doesn't match expected attr size " << sizeof(FileAttr);
  }
  printf("attrs[file section]: offset %" PRId64 ", size %" PRId64 "\n", header.attrs.offset,
         header.attrs.size);
  printf("data[file section]: offset %" PRId64 ", size %" PRId64 "\n", header.data.offset,
         header.data.size);
  printf("event_types[file section]: offset %" PRId64 ", size %" PRId64 "\n",
         header.event_types.offset, header.event_types.size);

  std::vector<int> features;
  for (size_t i = 0; i < FEAT_MAX_NUM; ++i) {
    size_t j = i / 8;
    size_t k = i % 8;
    if ((header.features[j] & (1 << k)) != 0) {
      features.push_back(i);
    }
  }
  for (auto& feature : features) {
    printf("feature: %s\n", GetFeatureName(feature).c_str());
  }
}

static const std::string GetFeatureName(int feature) {
  static std::map<int, std::string> feature_name_map = {
      {FEAT_TRACING_DATA, "tracing_data"},
      {FEAT_BUILD_ID, "build_id"},
      {FEAT_HOSTNAME, "hostname"},
      {FEAT_OSRELEASE, "osrelease"},
      {FEAT_VERSION, "version"},
      {FEAT_ARCH, "arch"},
      {FEAT_NRCPUS, "nrcpus"},
      {FEAT_CPUDESC, "cpudesc"},
      {FEAT_CPUID, "cpuid"},
      {FEAT_TOTAL_MEM, "total_mem"},
      {FEAT_CMDLINE, "cmdline"},
      {FEAT_EVENT_DESC, "event_desc"},
      {FEAT_CPU_TOPOLOGY, "cpu_topology"},
      {FEAT_NUMA_TOPOLOGY, "numa_topology"},
      {FEAT_BRANCH_STACK, "branch_stack"},
      {FEAT_PMU_MAPPINGS, "pmu_mappings"},
      {FEAT_GROUP_DESC, "group_desc"},
  };
  auto it = feature_name_map.find(feature);
  if (it != feature_name_map.end()) {
    return it->second;
  }
  return android::base::StringPrintf("unknown_feature(%d)", feature);
}

void DumpRecordCommand::DumpAttrSection() {
  std::vector<AttrWithId> attrs = record_file_reader_->AttrSection();
  for (size_t i = 0; i < attrs.size(); ++i) {
    const auto& attr = attrs[i];
    printf("attr %zu:\n", i + 1);
    DumpPerfEventAttr(*attr.attr, 1);
    if (!attr.ids.empty()) {
      printf("  ids:");
      for (const auto& id : attr.ids) {
        printf(" %" PRId64, id);
      }
      printf("\n");
    }
  }
}

void DumpRecordCommand::DumpDataSection() {
  record_file_reader_->ReadDataSection([](std::unique_ptr<Record> record) {
    record->Dump();
    return true;
  }, false);
}

void DumpRecordCommand::DumpFeatureSection() {
  std::map<int, SectionDesc> section_map = record_file_reader_->FeatureSectionDescriptors();
  for (const auto& pair : section_map) {
    int feature = pair.first;
    const auto& section = pair.second;
    printf("feature section for %s: offset %" PRId64 ", size %" PRId64 "\n",
           GetFeatureName(feature).c_str(), section.offset, section.size);
    if (feature == FEAT_BUILD_ID) {
      std::vector<BuildIdRecord> records = record_file_reader_->ReadBuildIdFeature();
      for (auto& r : records) {
        r.Dump(1);
      }
    } else if (feature == FEAT_OSRELEASE) {
      std::string s = record_file_reader_->ReadFeatureString(feature);
      PrintIndented(1, "osrelease: %s\n", s.c_str());
    } else if (feature == FEAT_ARCH) {
      std::string s = record_file_reader_->ReadFeatureString(feature);
      PrintIndented(1, "arch: %s\n", s.c_str());
    } else if (feature == FEAT_CMDLINE) {
      std::vector<std::string> cmdline = record_file_reader_->ReadCmdlineFeature();
      PrintIndented(1, "cmdline: %s\n", android::base::Join(cmdline, ' ').c_str());
    }
  }
}

void RegisterDumpRecordCommand() {
  RegisterCommand("dump", [] { return std::unique_ptr<Command>(new DumpRecordCommand); });
}