main.cpp

#include <iostream>
#include <print>
#include <fstream>
#include <string>
#include <filesystem>
#include <bit>
#include "iniLib/ini.h"

/*                                  MIT License

    Copyright (c) 2026 Maxwell Doose

    Permission is hereby granted, free of charge, to any person obtaining a copy
    of this software and associated documentation files (the "Software"), to deal
    in the Software without restriction, including without limitation the rights
    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    copies of the Software, and to permit persons to whom the Software is
    furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included in all
    copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
    SOFTWARE.
*/


std::filesystem::path fileName;
bool helpArg = false;
bool shellArg = false;

class cpu;
class ppu;
extern cpu* primary;
extern ppu* graphics;

constexpr std::array<std::string, 12> expectedExtensions
{
    ".bin",
    ".obj",
    ".prg",
    ".o65",
    ".rom",
    ".hex",
    ".neo",
    ".abs",
    ".com",
    ".p00",
    ".nes",
    ".obj"
};

bool chkFilePresence(std::vector<std::string> argVec);
bool chkValidExtension(std::filesystem::path file);
int8_t shell();

int main(int argc, char* argv[])
{
    std::vector<std::string> passedArgs(argv, argv + argc);
#ifndef _WIN32
    std::println("emu65\nCopyright 2026 Maxwell Doose");
#else
    std::println("emu65\n\rCopyright 2026 Maxwell Doose");
#endif

    if ((argc == 1) or (!chkFilePresence(passedArgs)))
    {
        std::println("Fatal: No file to run (run with -h for help)");
        return 1;
    }
    if (helpArg)
    {
#ifndef _WIN32
        std::println("Usage: emu65 [-h] | [-s]\n-h: Print help message to the console\n-s: Enter shell mode");
#else
        std::println("Usage: emu65 [-h] | [-s]\r\n-h: Print help message to the console\r\n-s: Enter shell mode");
#endif
        return 0;
    }
    else if (shellArg)
    {
        return shell();
    }
    std::println("Loading {} . . .", static_cast<std::string>(fileName.filename()));
    if (!std::filesystem::exists(fileName))
    {
        std::println("Fatal: File {} does not exist", static_cast<std::string>(fileName.filename()));
        return 2;
    }
    if (!chkValidExtension(fileName))
    {
        std::println("Fatal: File {} has invalid extension", static_cast<std::string>(fileName.filename()));
        char gotChar;
        std::println("Valid extensions: ");
        for (const auto& ext : expectedExtensions)
        {
            std::println("{}", ext);
        }
        return 3;
    }
    return 0;
}

bool chkFilePresence(std::vector<std::string> argVec)
{
    uint8_t where = 0;
    static uint8_t whereRet;
    bool fileFound = false;
    for (const std::string& str : argVec)
    {
        if (where == 0)
        {
            where++;
            continue;
        }
        if (str.starts_with('-') or str.starts_with('/')) // Prevents warnings relating to comparing constant operands with a logical or
        {
            where++;
            if (str == "-h" or "/h")
            {
                helpArg = true;
                return true;
            }
            else if (str == "-s" or "/s")
            {
                shellArg = true;
                return true;
            }
            continue;
        }

        fileName = static_cast<std::filesystem::path>(str);
        fileFound = true;
        whereRet = where;
        where++;
    }
    return fileFound;
}

bool chkValidExtension(std::filesystem::path file)
{
    std::string ext;
    {
        std::string getExt = file.extension().string();
        std::transform(getExt.begin(), getExt.end(), getExt.begin(), ::tolower);
        ext = getExt;
    }
    return std::find(expectedExtensions.begin(), expectedExtensions.end(), ext) != expectedExtensions.end();
}

int8_t shell()
{
    return 0;
}