#include "storage/io.hpp"
#include "osrm/contractor.hpp"
#include "osrm/contractor_config.hpp"
#include "osrm/exception.hpp"
#include "util/log.hpp"
#include "util/timezones.hpp"
#include "util/version.hpp"

#include <boost/filesystem.hpp>
#include <boost/program_options.hpp>
#include <boost/program_options/errors.hpp>

#include <cstdlib>
#include <exception>
#include <new>
#include <ostream>
#include <thread>

#include "util/meminfo.hpp"

using namespace osrm;

enum class return_code : unsigned
{
    ok,
    fail,
    exit
};

return_code parseArguments(int argc,
                           char *argv[],
                           std::string &verbosity,
                           contractor::ContractorConfig &contractor_config)
{
    // declare a group of options that will be allowed only on command line
    boost::program_options::options_description generic_options("Options");
    generic_options.add_options()("version,v", "Show version")("help,h", "Show this help message")(
        "verbosity,l",
        boost::program_options::value<std::string>(&verbosity)->default_value("INFO"),
        std::string("Log verbosity level: " + util::LogPolicy::GetLevels()).c_str());

    // declare a group of options that will be allowed on command line
    boost::program_options::options_description config_options("Configuration");
    config_options.add_options()(
        "threads,t",
        boost::program_options::value<unsigned int>(&contractor_config.requested_num_threads)
            ->default_value(std::thread::hardware_concurrency()),
        "Number of threads to use")(
        "core,k",
        boost::program_options::value<double>(&contractor_config.core_factor)->default_value(1.0),
        "DEPRECATED: Will always be 1.0. Percentage of the graph (in vertices) to contract "
        "[0..1].")("segment-speed-file",
                   boost::program_options::value<std::vector<std::string>>(
                       &contractor_config.updater_config.segment_speed_lookup_paths)
                       ->composing(),
                   "Lookup files containing nodeA, nodeB, speed data to adjust edge weights")(
        "turn-penalty-file",
        boost::program_options::value<std::vector<std::string>>(
            &contractor_config.updater_config.turn_penalty_lookup_paths)
            ->composing(),
        "Lookup files containing from_, to_, via_nodes, and turn penalties to adjust turn weights")(
        "level-cache,o",
        boost::program_options::bool_switch(&contractor_config.use_cached_priority)
            ->default_value(false),
        "DEPRECATED: Will always be false. Use .level file to retain the contraction level for "
        "each "
        "node from the last run.")(
        "edge-weight-updates-over-factor",
        boost::program_options::value<double>(
            &contractor_config.updater_config.log_edge_updates_factor)
            ->default_value(0.0),
        "Use with `--segment-speed-file`. Provide an `x` factor, by which Extractor will log edge "
        "weights updated by more than this factor")(
        "parse-conditionals-from-now",
        boost::program_options::value<std::time_t>(&contractor_config.updater_config.valid_now)
            ->default_value(0),
        "Optional for conditional turn restriction parsing, provide a UTC time stamp from "
        "which "
        "to evaluate the validity of conditional turn restrictions")(
        "time-zone-file",
        boost::program_options::value<std::string>(&contractor_config.updater_config.tz_file_path),
        "Required for conditional turn restriction parsing, provide a geojson file containing "
        "time zone boundaries");

    // hidden options, will be allowed on command line, but will not be shown to the user
    boost::program_options::options_description hidden_options("Hidden options");
    hidden_options.add_options()(
        "input,i",
        boost::program_options::value<boost::filesystem::path>(&contractor_config.base_path),
        "Input file in .osm, .osm.bz2 or .osm.pbf format");

    // positional option
    boost::program_options::positional_options_description positional_options;
    positional_options.add("input", 1);

    // combine above options for parsing
    boost::program_options::options_description cmdline_options;
    cmdline_options.add(generic_options).add(config_options).add(hidden_options);

    const auto *executable = argv[0];
    boost::program_options::options_description visible_options(
        "Usage: " + boost::filesystem::path(executable).filename().string() +
        " <input.osrm> [options]");
    visible_options.add(generic_options).add(config_options);

    // parse command line options
    boost::program_options::variables_map option_variables;
    try
    {
        boost::program_options::store(boost::program_options::command_line_parser(argc, argv)
                                          .options(cmdline_options)
                                          .positional(positional_options)
                                          .run(),
                                      option_variables);
    }
    catch (const boost::program_options::error &e)
    {
        util::Log(logERROR) << e.what();
        return return_code::fail;
    }

    if (option_variables.count("version"))
    {
        std::cout << OSRM_VERSION << std::endl;
        return return_code::exit;
    }

    if (option_variables.count("help"))
    {
        std::cout << visible_options;
        return return_code::exit;
    }

    boost::program_options::notify(option_variables);

    if (!option_variables.count("input"))
    {
        std::cout << visible_options;
        return return_code::fail;
    }

    return return_code::ok;
}

int main(int argc, char *argv[])
try
{
    util::LogPolicy::GetInstance().Unmute();
    std::string verbosity;
    contractor::ContractorConfig contractor_config;

    const return_code result = parseArguments(argc, argv, verbosity, contractor_config);

    if (return_code::fail == result)
    {
        return EXIT_FAILURE;
    }

    if (return_code::exit == result)
    {
        return EXIT_SUCCESS;
    }

    util::LogPolicy::GetInstance().SetLevel(verbosity);

    contractor_config.UseDefaultOutputNames(contractor_config.base_path);

    if (1 > contractor_config.requested_num_threads)
    {
        util::Log(logERROR) << "Number of threads must be 1 or larger";
        return EXIT_FAILURE;
    }

    const unsigned recommended_num_threads = std::thread::hardware_concurrency();

    if (recommended_num_threads != contractor_config.requested_num_threads)
    {
        util::Log(logWARNING) << "The recommended number of threads is " << recommended_num_threads
                              << "! This setting may have performance side-effects.";
    }

    if (!contractor_config.IsValid())
    {
        return EXIT_FAILURE;
    }

    util::Log() << "Input file: " << contractor_config.base_path.string() << ".osrm";
    util::Log() << "Threads: " << contractor_config.requested_num_threads;

    osrm::contract(contractor_config);

    util::DumpMemoryStats();

    return EXIT_SUCCESS;
}
catch (const osrm::RuntimeError &e)
{
    util::DumpMemoryStats();
    util::Log(logERROR) << e.what();
    return e.GetCode();
}
catch (const std::bad_alloc &e)
{
    util::DumpMemoryStats();
    util::Log(logERROR) << e.what();
    util::Log(logERROR) << "Please provide more memory or consider using a larger swapfile";
    return EXIT_FAILURE;
}
#ifdef _WIN32
catch (const std::exception &e)
{
    util::Log(logERROR) << "[exception] " << e.what();
    return EXIT_FAILURE;
}
#endif
