/*
 *  prjpeppercorn -- GateMate FPGAs Bitstream Documentation and Tools
 *
 *  Copyright (C) 2024  The Project Peppercorn Authors.
 *
 *  Permission to use, copy, modify, and/or distribute this software for any
 *  purpose with or without fee is hereby granted, provided that the above
 *  copyright notice and this permission notice appear in all copies.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 *  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 *  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 *  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 */

#include <boost/program_options.hpp>
#include <filesystem>
#include <fstream>
#include <iostream>
#include <stdexcept>
#include <streambuf>
#include "Bitstream.hpp"
#include "Chip.hpp"
#include "ChipConfig.hpp"
#include "version.hpp"

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

    po::options_description options("Allowed options");
    options.add_options()("help,h", "show help");
    options.add_options()("verbose,v", "verbose output");
    po::positional_options_description pos;
    options.add_options()("input", po::value<std::string>()->required(), "input bitstream file");
    pos.add("input", 1);
    options.add_options()("textcfg", po::value<std::string>()->required(), "output textual configuration");
    pos.add("textcfg", 1);

    po::variables_map vm;
    try {
        po::parsed_options parsed = po::command_line_parser(argc, argv).options(options).positional(pos).run();
        po::store(parsed, vm);
        po::notify(vm);
    } catch (po::required_option &e) {
        std::cerr << "Error: input file is mandatory." << std::endl << std::endl;
        goto help;
    } catch (std::exception &e) {
        std::cerr << "Error: " << e.what() << std::endl << std::endl;
        goto help;
    }

    if (vm.count("help")) {
    help:
        std::filesystem::path path(argv[0]);
        std::cerr << "Open Source Tools for GateMate FPGAs Version " << git_describe_str << std::endl;
        std::cerr << "Copyright (C) 2024 The Project Peppercorn Authors" << std::endl;
        std::cerr << std::endl;
        std::cerr << path.stem().c_str() << ": GateMate bitstream to text config converter" << std::endl;
        std::cerr << std::endl;
        std::cerr << "Usage: " << argv[0] << " input.bit [output.config] [options]" << std::endl;
        std::cerr << std::endl;
        std::cerr << options << std::endl;
        return vm.count("help") ? 0 : 1;
    }

    std::ifstream bit_file(vm["input"].as<std::string>(), std::ios::binary);
    if (!bit_file) {
        std::cerr << "Failed to open input file" << std::endl;
        return 1;
    }

    try {
        Chip c = Bitstream::read(bit_file).deserialise_chip();
        ChipConfig cc = ChipConfig::from_chip(c);
        std::ofstream out_file(vm["textcfg"].as<std::string>());
        if (!out_file) {
            std::cerr << "Failed to open output file" << std::endl;
            return 1;
        }
        out_file << cc.to_string();
        return 0;
    } catch (BitstreamParseError &e) {
        std::cerr << "Failed to process input bitstream: " << e.what() << std::endl;
        return 1;
    } catch (std::runtime_error &e) {
        std::cerr << "Failed to process input bitstream: " << e.what() << std::endl;
        return 1;
    }
}