#include <iostream>

#include <string>

#include <marisa.h>

#include "cmdopt.h"

namespace {

bool mmap_flag = true;

void print_help(const char *cmd) {

  std::cerr << "Usage: " << cmd << " [OPTION]... DIC\n\n"

      "Options:\n"

      "  -m, --mmap-dictionary  use memory-mapped I/O to load a dictionary"

      " (default)\n"

      "  -r, --read-dictionary  read an entire dictionary into memory\n"

      "  -h, --help             print this help\n"

      << std::endl;

}

int lookup(const char * const *args, std::size_t num_args) {

  if (num_args == 0) {

    std::cerr << "error: dictionary is not specified" << std::endl;

    return 10;

  } else if (num_args > 1) {

    std::cerr << "error: more than one dictionaries are specified"

        << std::endl;

    return 11;

  }

  marisa::Trie trie;

  if (mmap_flag) {

    try {

      trie.mmap(args[0]);

    } catch (const marisa::Exception &ex) {

      std::cerr << ex.what() << ": failed to mmap a dictionary file: "

          << args[0] << std::endl;

      return 20;

    }

  } else {

    try {

      trie.load(args[0]);

    } catch (const marisa::Exception &ex) {

      std::cerr << ex.what() << ": failed to load a dictionary file: "

          << args[0] << std::endl;

      return 21;

    }

  }

  marisa::Agent agent;

  std::string str;

  while (std::getline(std::cin, str)) {

    try {

      agent.set_query(str.c_str(), str.length());

      if (trie.lookup(agent)) {

        std::cout << agent.key().id() << '\t' << str << '\n';

      } else {

        std::cout << "-1\t" << str << '\n';

      }

    } catch (const marisa::Exception &ex) {

      std::cerr << ex.what() << ": lookup() failed: " << str << std::endl;

      return 30;

    }

    if (!std::cout) {

      std::cerr << "error: failed to write results to standard output"

          << std::endl;

      return 30;

    }

  }

  return 0;

}

}  // namespace

int main(int argc, char *argv[]) {

  std::ios::sync_with_stdio(false);

  ::cmdopt_option long_options[] = {

    { "mmap-dictionary", 0, NULL, 'm' },

    { "read-dictionary", 0, NULL, 'r' },

    { "help", 0, NULL, 'h' },

    { NULL, 0, NULL, 0 }

  };

  ::cmdopt_t cmdopt;

  ::cmdopt_init(&cmdopt, argc, argv, "mrh", long_options);

  int label;

  while ((label = ::cmdopt_get(&cmdopt)) != -1) {

    switch (label) {

      case 'm': {

        mmap_flag = true;

        break;

      }

      case 'r': {

        mmap_flag = false;

        break;

      }

      case 'h': {

        print_help(argv[0]);

        return 0;

      }

      default: {

        return 1;

      }

    }

  }

  return lookup(cmdopt.argv + cmdopt.optind, cmdopt.argc - cmdopt.optind);

}