#include "contractor/contractor.hpp"
#include "contractor/contractor_config.hpp"
#include "util/simple_logger.hpp"
#include "util/version.hpp"

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

#include <tbb/task_scheduler_init.h>

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

using namespace osrm;

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

return_code parseArguments(int argc, char *argv[], 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");

    // 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(tbb::task_scheduler_init::default_num_threads()),
        "Number of threads to use")(
        "core,k",
        boost::program_options::value<double>(&contractor_config.core_factor)->default_value(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.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.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::value<bool>(&contractor_config.use_cached_priority)
            ->default_value(false),
        "Use .level file to retain the contaction level for each node from the last run.");

    // 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.osrm_input_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::SimpleLogger().Write(logWARNING) << "[error] " << e.what();
        return return_code::fail;
    }

    if (option_variables.count("version"))
    {
        util::SimpleLogger().Write() << OSRM_VERSION;
        return return_code::exit;
    }

    if (option_variables.count("help"))
    {
        util::SimpleLogger().Write() << visible_options;
        return return_code::exit;
    }

    boost::program_options::notify(option_variables);

    if (!option_variables.count("input"))
    {
        util::SimpleLogger().Write() << visible_options;
        return return_code::fail;
    }

    return return_code::ok;
}

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

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

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

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

    contractor_config.UseDefaultOutputNames();

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

    const unsigned recommended_num_threads = tbb::task_scheduler_init::default_num_threads();

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

    if (!boost::filesystem::is_regular_file(contractor_config.osrm_input_path))
    {
        util::SimpleLogger().Write(logWARNING)
            << "Input file " << contractor_config.osrm_input_path.string() << " not found!";
        return EXIT_FAILURE;
    }

    util::SimpleLogger().Write() << "Input file: "
                                 << contractor_config.osrm_input_path.filename().string();
    util::SimpleLogger().Write() << "Threads: " << contractor_config.requested_num_threads;

    tbb::task_scheduler_init init(contractor_config.requested_num_threads);

    return contractor::Contractor(contractor_config).Run();
}
catch (const std::bad_alloc &e)
{
    util::SimpleLogger().Write(logWARNING) << "[exception] " << e.what();
    util::SimpleLogger().Write(logWARNING)
        << "Please provide more memory or consider using a larger swapfile";
    return EXIT_FAILURE;
}