// Copyright 2022, FOSS-VG Developers and Contributers
//
// 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
// version 3 along with this program.
// If not, see https://www.gnu.org/licenses/agpl-3.0.en.html

#include <iostream>
#include <fstream>
#include <vector>

#include "../lib/nbt.hpp"
#include "../lib/cli.hpp"

#define EXIT_SUCCESS 0
#define EXIT_RUNTIME 1
#define EXIT_USAGE 2
#define EXIT_UNIMPLEMENTED 3

int main(int argc, char* argv[]) {
    std::vector<CLI::Flag> flags;
    flags.push_back(CLI::Flag('h', "help", "print help and exit"));
    flags.push_back(CLI::Flag('l', "license", "print license information and exit"));
    flags.push_back(CLI::Flag('x', "hexadecimal", "print numbers in hex format"));
    std::vector<CLI::Option> options;
    std::vector<CLI::Argument> arguments;
    arguments.push_back(CLI::Argument("FILE", "path of the file to work on"));

    CLI::ArgumentsParser cliParser = CLI::ArgumentsParser(argc, argv, flags, options, arguments, "Present NBT in human or machine readable formats - preliminary implementation.");

    if (cliParser.getFlag("help").value){
        std::cout << cliParser.getUsage() << std::endl;
        return EXIT_SUCCESS;
    }
    if (cliParser.getFlag("license").value){
        std::cout
            << "Copyright 2022, FOSS-VG Developers and Contributers\n"
            << "\n"
            << "DumpNBT is part of the FOSS-VG development tool suite.\n"
            << "\n"
            << "This program is free software: you can redistribute it and/or modify it\n"
            << "under the terms of the GNU Affero General Public License as published\n"
            << "by the Free Software Foundation, version 3.\n"
            << "\n"
            << "This program is distributed in the hope that it will be useful,\n"
            << "but WITHOUT ANY WARRANTY; without even the implied\n"
            << "warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"
            << "See the GNU Affero General Public License for more details.\n"
            << "\n"
            << "You should have received a copy of the GNU Affero General Public License\n"
            << "version 3 along with this program.\n"
            << "If not, see https://www.gnu.org/licenses/agpl-3.0.en.html"
            << std::endl;
        return EXIT_SUCCESS;
    }

    if (cliParser.wrongUsage) {
        std::cerr << cliParser.getUsage() << std::endl;
        return EXIT_USAGE;
    }

    std::ifstream fileStream;
    fileStream.open(cliParser.getArgument(0).value, std::ios::in | std::ios::binary | std::ios::ate);
    if (!fileStream.is_open()) {
        std::cerr << argv[0] << ": File not found: " << cliParser.getArgument(0).value << std::endl;
        return EXIT_RUNTIME;
    }

    uint64_t fileSize = fileStream.tellg();
    fileStream.seekg(0, std::ios::beg);

    uint8_t data[fileSize];
    uint8_t* nextByte = new uint8_t;

    for (uint64_t i=0; i<fileSize; i++) {
        fileStream.read(reinterpret_cast<char*>(nextByte), 1);
        data[i] = *nextByte;
    }
    fileStream.close();

    bool isValidData = NBT::validateRawNBTData(data, fileSize);
    if (isValidData) {
        std::cerr << "Valid data." << std::endl;
    } else {
        std::cerr << "Invalid data." << std::endl;
        return EXIT_RUNTIME;
    }

    //TODO: print things here

    return EXIT_SUCCESS;
}