//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
//  This source code is licensed under both the GPLv2 (found in the
//  COPYING file in the root directory) and Apache 2.0 License
//  (found in the LICENSE.Apache file in the root directory).
//
#ifndef ROCKSDB_LITE

#include "rocksdb/sst_dump_tool.h"

#include <cinttypes>
#include <iostream>

#include "port/port.h"
#include "rocksdb/utilities/ldb_cmd.h"
#include "table/sst_file_dumper.h"

namespace ROCKSDB_NAMESPACE {

static const std::vector<std::pair<CompressionType, const char*>>
    kCompressions = {
        {CompressionType::kNoCompression, "kNoCompression"},
        {CompressionType::kSnappyCompression, "kSnappyCompression"},
        {CompressionType::kZlibCompression, "kZlibCompression"},
        {CompressionType::kBZip2Compression, "kBZip2Compression"},
        {CompressionType::kLZ4Compression, "kLZ4Compression"},
        {CompressionType::kLZ4HCCompression, "kLZ4HCCompression"},
        {CompressionType::kXpressCompression, "kXpressCompression"},
        {CompressionType::kZSTD, "kZSTD"}};

namespace {

void print_help(bool to_stderr) {
  fprintf(
      to_stderr ? stderr : stdout,
      R"(sst_dump --file=<data_dir_OR_sst_file> [--command=check|scan|raw|recompress|identify]
    --file=<data_dir_OR_sst_file>
      Path to SST file or directory containing SST files

    --env_uri=<uri of underlying Env>
      URI of underlying Env

    --command=check|scan|raw|verify|identify
        check: Iterate over entries in files but don't print anything except if an error is encountered (default command)
        scan: Iterate over entries in files and print them to screen
        raw: Dump all the table contents to <file_name>_dump.txt
        verify: Iterate all the blocks in files verifying checksum to detect possible corruption but don't print anything except if a corruption is encountered
        recompress: reports the SST file size if recompressed with different
                    compression types
        identify: Reports a file is a valid SST file or lists all valid SST files under a directory

    --output_hex
      Can be combined with scan command to print the keys and values in Hex

    --decode_blob_index
      Decode blob indexes and print them in a human-readable format during scans.

    --from=<user_key>
      Key to start reading from when executing check|scan

    --to=<user_key>
      Key to stop reading at when executing check|scan

    --prefix=<user_key>
      Returns all keys with this prefix when executing check|scan
      Cannot be used in conjunction with --from

    --read_num=<num>
      Maximum number of entries to read when executing check|scan

    --verify_checksum
      Verify file checksum when executing check|scan

    --input_key_hex
      Can be combined with --from and --to to indicate that these values are encoded in Hex

    --show_properties
      Print table properties after iterating over the file when executing
      check|scan|raw|identify

    --set_block_size=<block_size>
      Can be combined with --command=recompress to set the block size that will
      be used when trying different compression algorithms

    --compression_types=<comma-separated list of CompressionType members, e.g.,
      kSnappyCompression>
      Can be combined with --command=recompress to run recompression for this
      list of compression types

    --parse_internal_key=<0xKEY>
      Convenience option to parse an internal key on the command line. Dumps the
      internal key in hex format {'key' @ SN: type}

    --compression_level_from=<compression_level>
      Compression level to start compressing when executing recompress. One compression type
      and compression_level_to must also be specified

    --compression_level_to=<compression_level>
      Compression level to stop compressing when executing recompress. One compression type
      and compression_level_from must also be specified

    --compression_max_dict_bytes=<uint32_t>
      Maximum size of dictionary used to prime the compression library

    --compression_zstd_max_train_bytes=<uint32_t>
      Maximum size of training data passed to zstd's dictionary trainer
)");
}

// arg_name would include all prefix, e.g. "--my_arg="
// arg_val is the parses value.
// True if there is a match. False otherwise.
// Woud exit after printing errmsg if cannot be parsed.
bool ParseIntArg(const char* arg, const std::string arg_name,
                 const std::string err_msg, int64_t* arg_val) {
  if (strncmp(arg, arg_name.c_str(), arg_name.size()) == 0) {
    std::string input_str = arg + arg_name.size();
    std::istringstream iss(input_str);
    iss >> *arg_val;
    if (iss.fail()) {
      fprintf(stderr, "%s\n", err_msg.c_str());
      exit(1);
    }
    return true;
  }
  return false;
}
}  // namespace

int SSTDumpTool::Run(int argc, char const* const* argv, Options options) {
  const char* env_uri = nullptr;
  const char* dir_or_file = nullptr;
  uint64_t read_num = std::numeric_limits<uint64_t>::max();
  std::string command;

  char junk;
  uint64_t n;
  bool verify_checksum = false;
  bool output_hex = false;
  bool decode_blob_index = false;
  bool input_key_hex = false;
  bool has_from = false;
  bool has_to = false;
  bool use_from_as_prefix = false;
  bool show_properties = false;
  bool show_summary = false;
  bool set_block_size = false;
  bool has_compression_level_from = false;
  bool has_compression_level_to = false;
  bool has_specified_compression_types = false;
  std::string from_key;
  std::string to_key;
  std::string block_size_str;
  std::string compression_level_from_str;
  std::string compression_level_to_str;
  size_t block_size = 0;
  size_t readahead_size = 2 * 1024 * 1024;
  std::vector<std::pair<CompressionType, const char*>> compression_types;
  uint64_t total_num_files = 0;
  uint64_t total_num_data_blocks = 0;
  uint64_t total_data_block_size = 0;
  uint64_t total_index_block_size = 0;
  uint64_t total_filter_block_size = 0;
  int32_t compress_level_from = CompressionOptions::kDefaultCompressionLevel;
  int32_t compress_level_to = CompressionOptions::kDefaultCompressionLevel;
  uint32_t compression_max_dict_bytes =
      ROCKSDB_NAMESPACE::CompressionOptions().max_dict_bytes;
  uint32_t compression_zstd_max_train_bytes =
      ROCKSDB_NAMESPACE::CompressionOptions().zstd_max_train_bytes;

  int64_t tmp_val;

  for (int i = 1; i < argc; i++) {
    if (strncmp(argv[i], "--env_uri=", 10) == 0) {
      env_uri = argv[i] + 10;
    } else if (strncmp(argv[i], "--file=", 7) == 0) {
      dir_or_file = argv[i] + 7;
    } else if (strcmp(argv[i], "--output_hex") == 0) {
      output_hex = true;
    } else if (strcmp(argv[i], "--decode_blob_index") == 0) {
      decode_blob_index = true;
    } else if (strcmp(argv[i], "--input_key_hex") == 0) {
      input_key_hex = true;
    } else if (sscanf(argv[i], "--read_num=%lu%c", (unsigned long*)&n, &junk) ==
               1) {
      read_num = n;
    } else if (strcmp(argv[i], "--verify_checksum") == 0) {
      verify_checksum = true;
    } else if (strncmp(argv[i], "--command=", 10) == 0) {
      command = argv[i] + 10;
    } else if (strncmp(argv[i], "--from=", 7) == 0) {
      from_key = argv[i] + 7;
      has_from = true;
    } else if (strncmp(argv[i], "--to=", 5) == 0) {
      to_key = argv[i] + 5;
      has_to = true;
    } else if (strncmp(argv[i], "--prefix=", 9) == 0) {
      from_key = argv[i] + 9;
      use_from_as_prefix = true;
    } else if (strcmp(argv[i], "--show_properties") == 0) {
      show_properties = true;
    } else if (strcmp(argv[i], "--show_summary") == 0) {
      show_summary = true;
    } else if (ParseIntArg(argv[i], "--set_block_size=",
                           "block size must be numeric", &tmp_val)) {
      set_block_size = true;
      block_size = static_cast<size_t>(tmp_val);
    } else if (ParseIntArg(argv[i], "--readahead_size=",
                           "readahead_size must be numeric", &tmp_val)) {
      readahead_size = static_cast<size_t>(tmp_val);
    } else if (strncmp(argv[i], "--compression_types=", 20) == 0) {
      std::string compression_types_csv = argv[i] + 20;
      std::istringstream iss(compression_types_csv);
      std::string compression_type;
      has_specified_compression_types = true;
      while (std::getline(iss, compression_type, ',')) {
        auto iter = std::find_if(
            kCompressions.begin(), kCompressions.end(),
            [&compression_type](std::pair<CompressionType, const char*> curr) {
              return curr.second == compression_type;
            });
        if (iter == kCompressions.end()) {
          fprintf(stderr, "%s is not a valid CompressionType\n",
                  compression_type.c_str());
          exit(1);
        }
        compression_types.emplace_back(*iter);
      }
    } else if (strncmp(argv[i], "--parse_internal_key=", 21) == 0) {
      std::string in_key(argv[i] + 21);
      try {
        in_key = ROCKSDB_NAMESPACE::LDBCommand::HexToString(in_key);
      } catch (...) {
        std::cerr << "ERROR: Invalid key input '"
          << in_key
          << "' Use 0x{hex representation of internal rocksdb key}" << std::endl;
        return -1;
      }
      Slice sl_key = ROCKSDB_NAMESPACE::Slice(in_key);
      ParsedInternalKey ikey;
      int retc = 0;
      if (!ParseInternalKey(sl_key, &ikey)) {
        std::cerr << "Internal Key [" << sl_key.ToString(true /* in hex*/)
                  << "] parse error!\n";
        retc = -1;
      }
      fprintf(stdout, "key=%s\n", ikey.DebugString(true).c_str());
      return retc;
    } else if (ParseIntArg(argv[i], "--compression_level_from=",
                           "compression_level_from must be numeric",
                           &tmp_val)) {
      has_compression_level_from = true;
      compress_level_from = static_cast<int>(tmp_val);
    } else if (ParseIntArg(argv[i], "--compression_level_to=",
                           "compression_level_to must be numeric", &tmp_val)) {
      has_compression_level_to = true;
      compress_level_to = static_cast<int>(tmp_val);
    } else if (ParseIntArg(argv[i], "--compression_max_dict_bytes=",
                           "compression_max_dict_bytes must be numeric",
                           &tmp_val)) {
      if (tmp_val < 0 || tmp_val > port::kMaxUint32) {
        fprintf(stderr, "compression_max_dict_bytes must be a uint32_t: '%s'\n",
                argv[i]);
        print_help(/*to_stderr*/ true);
        return 1;
      }
      compression_max_dict_bytes = static_cast<uint32_t>(tmp_val);
    } else if (ParseIntArg(argv[i], "--compression_zstd_max_train_bytes=",
                           "compression_zstd_max_train_bytes must be numeric",
                           &tmp_val)) {
      if (tmp_val < 0 || tmp_val > port::kMaxUint32) {
        fprintf(stderr,
                "compression_zstd_max_train_bytes must be a uint32_t: '%s'\n",
                argv[i]);
        print_help(/*to_stderr*/ true);
        return 1;
      }
      compression_zstd_max_train_bytes = static_cast<uint32_t>(tmp_val);
    } else if (strcmp(argv[i], "--help") == 0) {
      print_help(/*to_stderr*/ false);
      return 0;
    } else if (strcmp(argv[i], "--version") == 0) {
      printf("sst_dump from RocksDB %d.%d.%d\n", ROCKSDB_MAJOR, ROCKSDB_MINOR,
             ROCKSDB_PATCH);
      return 0;
    } else {
      fprintf(stderr, "Unrecognized argument '%s'\n\n", argv[i]);
      print_help(/*to_stderr*/ true);
      return 1;
    }
  }

  if(has_compression_level_from && has_compression_level_to) {
    if(!has_specified_compression_types || compression_types.size() != 1) {
      fprintf(stderr, "Specify one compression type.\n\n");
      exit(1);
    }
  } else if(has_compression_level_from || has_compression_level_to) {
    fprintf(stderr, "Specify both --compression_level_from and "
                     "--compression_level_to.\n\n");
    exit(1);
  }

  if (use_from_as_prefix && has_from) {
    fprintf(stderr, "Cannot specify --prefix and --from\n\n");
    exit(1);
  }

  if (input_key_hex) {
    if (has_from || use_from_as_prefix) {
      from_key = ROCKSDB_NAMESPACE::LDBCommand::HexToString(from_key);
    }
    if (has_to) {
      to_key = ROCKSDB_NAMESPACE::LDBCommand::HexToString(to_key);
    }
  }

  if (dir_or_file == nullptr) {
    fprintf(stderr, "file or directory must be specified.\n\n");
    print_help(/*to_stderr*/ true);
    exit(1);
  }

  std::shared_ptr<ROCKSDB_NAMESPACE::Env> env_guard;

  // If caller of SSTDumpTool::Run(...) does not specify a different env other
  // than Env::Default(), then try to load custom env based on dir_or_file.
  // Otherwise, the caller is responsible for creating custom env.
  if (!options.env || options.env == ROCKSDB_NAMESPACE::Env::Default()) {
    Env* env = Env::Default();
    Status s = Env::LoadEnv(env_uri ? env_uri : "", &env, &env_guard);
    if (!s.ok() && !s.IsNotFound()) {
      fprintf(stderr, "LoadEnv: %s\n", s.ToString().c_str());
      exit(1);
    }
    options.env = env;
  } else {
    fprintf(stdout, "options.env is %p\n", options.env);
  }

  std::vector<std::string> filenames;
  ROCKSDB_NAMESPACE::Env* env = options.env;
  ROCKSDB_NAMESPACE::Status st = env->GetChildren(dir_or_file, &filenames);
  bool dir = true;
  if (!st.ok() || filenames.empty()) {
    // dir_or_file does not exist or does not contain children
    // Check its existence first
    Status s = env->FileExists(dir_or_file);
    // dir_or_file does not exist
    if (!s.ok()) {
      fprintf(stderr, "%s%s: No such file or directory\n", s.ToString().c_str(),
              dir_or_file);
      return 1;
    }
    // dir_or_file exists and is treated as a "file"
    // since it has no children
    // This is ok since later it will be checked
    // that whether it is a valid sst or not
    // (A directory "file" is not a valid sst)
    filenames.clear();
    filenames.push_back(dir_or_file);
    dir = false;
  }

  uint64_t total_read = 0;
  // List of RocksDB SST file without corruption
  std::vector<std::string> valid_sst_files;
  for (size_t i = 0; i < filenames.size(); i++) {
    std::string filename = filenames.at(i);
    if (filename.length() <= 4 ||
        filename.rfind(".sst") != filename.length() - 4) {
      // ignore
      continue;
    }

    if (dir) {
      filename = std::string(dir_or_file) + "/" + filename;
    }

    ROCKSDB_NAMESPACE::SstFileDumper dumper(options, filename, readahead_size,
                                            verify_checksum, output_hex,
                                            decode_blob_index);
    // Not a valid SST
    if (!dumper.getStatus().ok()) {
      fprintf(stderr, "%s: %s\n", filename.c_str(),
              dumper.getStatus().ToString().c_str());
      continue;
    } else {
      valid_sst_files.push_back(filename);
      // Print out from and to key information once
      // where there is at least one valid SST
      if (valid_sst_files.size() == 1) {
        // from_key and to_key are only used for "check", "scan", or ""
        if (command == "check" || command == "scan" || command == "") {
          fprintf(stdout, "from [%s] to [%s]\n",
                  ROCKSDB_NAMESPACE::Slice(from_key).ToString(true).c_str(),
                  ROCKSDB_NAMESPACE::Slice(to_key).ToString(true).c_str());
        }
      }
    }

    if (command == "recompress") {
      dumper.ShowAllCompressionSizes(
          set_block_size ? block_size : 16384,
          compression_types.empty() ? kCompressions : compression_types,
          compress_level_from, compress_level_to, compression_max_dict_bytes,
          compression_zstd_max_train_bytes);
      return 0;
    }

    if (command == "raw") {
      std::string out_filename = filename.substr(0, filename.length() - 4);
      out_filename.append("_dump.txt");

      st = dumper.DumpTable(out_filename);
      if (!st.ok()) {
        fprintf(stderr, "%s: %s\n", filename.c_str(), st.ToString().c_str());
        exit(1);
      } else {
        fprintf(stdout, "raw dump written to file %s\n", &out_filename[0]);
      }
      continue;
    }

    // scan all files in give file path.
    if (command == "" || command == "scan" || command == "check") {
      st = dumper.ReadSequential(
          command == "scan", read_num > 0 ? (read_num - total_read) : read_num,
          has_from || use_from_as_prefix, from_key, has_to, to_key,
          use_from_as_prefix);
      if (!st.ok()) {
        fprintf(stderr, "%s: %s\n", filename.c_str(),
            st.ToString().c_str());
      }
      total_read += dumper.GetReadNumber();
      if (read_num > 0 && total_read > read_num) {
        break;
      }
    }

    if (command == "verify") {
      st = dumper.VerifyChecksum();
      if (!st.ok()) {
        fprintf(stderr, "%s is corrupted: %s\n", filename.c_str(),
                st.ToString().c_str());
      } else {
        fprintf(stdout, "The file is ok\n");
      }
      continue;
    }

    if (show_properties || show_summary) {
      const ROCKSDB_NAMESPACE::TableProperties* table_properties;

      std::shared_ptr<const ROCKSDB_NAMESPACE::TableProperties>
          table_properties_from_reader;
      st = dumper.ReadTableProperties(&table_properties_from_reader);
      if (!st.ok()) {
        fprintf(stderr, "%s: %s\n", filename.c_str(), st.ToString().c_str());
        fprintf(stderr, "Try to use initial table properties\n");
        table_properties = dumper.GetInitTableProperties();
      } else {
        table_properties = table_properties_from_reader.get();
      }
      if (table_properties != nullptr) {
        if (show_properties) {
          fprintf(stdout,
                  "Table Properties:\n"
                  "------------------------------\n"
                  "  %s",
                  table_properties->ToString("\n  ", ": ").c_str());
        }
        total_num_files += 1;
        total_num_data_blocks += table_properties->num_data_blocks;
        total_data_block_size += table_properties->data_size;
        total_index_block_size += table_properties->index_size;
        total_filter_block_size += table_properties->filter_size;
        if (show_properties) {
          fprintf(stdout,
                  "Raw user collected properties\n"
                  "------------------------------\n");
          for (const auto& kv : table_properties->user_collected_properties) {
            std::string prop_name = kv.first;
            std::string prop_val = Slice(kv.second).ToString(true);
            fprintf(stdout, "  # %s: 0x%s\n", prop_name.c_str(),
                    prop_val.c_str());
          }
        }
      } else {
        fprintf(stderr, "Reader unexpectedly returned null properties\n");
      }
    }
  }
  if (show_summary) {
    fprintf(stdout, "total number of files: %" PRIu64 "\n", total_num_files);
    fprintf(stdout, "total number of data blocks: %" PRIu64 "\n",
            total_num_data_blocks);
    fprintf(stdout, "total data block size: %" PRIu64 "\n",
            total_data_block_size);
    fprintf(stdout, "total index block size: %" PRIu64 "\n",
            total_index_block_size);
    fprintf(stdout, "total filter block size: %" PRIu64 "\n",
            total_filter_block_size);
  }

  if (valid_sst_files.empty()) {
    // No valid SST files are found
    // Exit with an error state
    if (dir) {
      fprintf(stdout, "------------------------------\n");
      fprintf(stderr, "No valid SST files found in %s\n", dir_or_file);
    } else {
      fprintf(stderr, "%s is not a valid SST file\n", dir_or_file);
    }
    return 1;
  } else {
    if (command == "identify") {
      if (dir) {
        fprintf(stdout, "------------------------------\n");
        fprintf(stdout, "List of valid SST files found in %s:\n", dir_or_file);
        for (const auto& f : valid_sst_files) {
          fprintf(stdout, "%s\n", f.c_str());
        }
        fprintf(stdout, "Number of valid SST files: %zu\n",
                valid_sst_files.size());
      } else {
        fprintf(stdout, "%s is a valid SST file\n", dir_or_file);
      }
    }
    // At least one valid SST
    // exit with a success state
    return 0;
  }
}
}  // namespace ROCKSDB_NAMESPACE

#endif  // ROCKSDB_LITE