/*  This file is part of epubgrep.
 *  Copyright © 2021 tastytea <tastytea@tastytea.de>
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero General Public License as published by
 *  the Free Software Foundation, version 3.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "options.hpp"
#include "search.hpp"

#include <boost/locale/generator.hpp>
#include <boost/locale/message.hpp>
#include <boost/program_options/errors.hpp>
#include <boost/program_options/variables_map.hpp>

#include <clocale>
#include <cstdint>
#include <cstdlib>
#include <exception>
#include <iostream>
#include <locale>
#include <string>
#include <typeinfo>
#include <vector>

int main(int argc, char *argv[])
{
    namespace po = boost::program_options;
    using namespace epubgrep;

    using boost::locale::translate;
    using std::cerr;
    using std::cout;

    // locale_generator("").name.c_str() returns "*" instead of "". That's why
    // the global C locale isn't changed. So we have to set it additionally.
    std::setlocale(LC_ALL, "");
    boost::locale::generator locale_generator;
    locale_generator.add_messages_path("translations");
    locale_generator.add_messages_path("/usr/share/locale");
    locale_generator.add_messages_domain("epubgrep");
    std::locale::global(locale_generator(""));
    cout.imbue(std::locale());
    cerr.imbue(std::locale());

    po::variables_map vm;
    try
    {
        vm = options::parse_options(argc, argv);
    }
    catch (std::exception &e)
    { // Exceptions we can't recover from or ones we don't know.
        cerr << '\n' << translate("ERROR: ") << e.what() << '\n';
        cerr << translate("Error while parsing options.") << '\n';
        return EXIT_FAILURE;
    }

    if (vm.count("help") + vm.count("version") > 0)
    {
        return EXIT_SUCCESS;
    }

    if (vm.count("input-file") == 0)
    {
        cout << "NO INPUT FILE\n";
        // TODO: Read data from stdin.
    }
    else
    {
        search::options opts;
        if (vm.count("basic-regexp") > 0)
        {
            opts.regex = search::regex_kind::basic;
        }
        if (vm.count("extended-regexp") > 0)
        {
            opts.regex = search::regex_kind::extended;
        }
        if (vm.count("perl-regexp") > 0)
        {
            opts.regex = search::regex_kind::perl;
        }
        if (vm.count("grep") > 0)
        {
            opts.grep_like = true;
        }
        if (vm.count("ignore-case") > 0)
        {
            opts.ignore_case = true;
        }
        if (vm.count("raw") > 0)
        {
            opts.raw = true;
        }
        opts.context = vm["context"].as<std::uint64_t>();

        for (const auto &filepath :
             vm["input-file"].as<std::vector<std::string>>())
        {
            for (const auto &regex :
                 vm["regexp"].as<std::vector<std::string>>())
            {
                try
                {
                    for (const auto &match :
                         search::search(filepath, regex, opts))
                    {
                        cout << match.filepath;
                        if (!match.headline.empty())
                        {

                            cout << ", " << match.headline;
                        }
                        if (!match.page.empty())
                        {
                            cout << ", page " << match.page;
                        }
                        cout << ": " << match.context.first << match.text
                             << match.context.second << '\n';
                    }
                }
                catch (const std::exception &e)
                { // Unknown errors.
                    cerr << '\n' << translate("ERROR: ") << e.what() << '\n';
                    cerr << translate("Error while searching.") << '\n';
                    // NOTE: Maybe we should continue with the next regex/file?
                    return EXIT_FAILURE;
                }
            }
        }
    }
}