/***
    Copyright (C) 2022-2023 J Reece Wilson (a/k/a "Reece"). All rights reserved.

    File: AuCmdLinePlatform.cpp
    Date: 2022-2-6
    Author: Reece
***/
#include <Source/RuntimeInternal.hpp>
#include "AuCmdLine.hpp"
#include "AuCmdLinePlatform.hpp"

#if defined(AURORA_PLATFORM_WIN32)
    #include <shellapi.h>
#endif

#if defined(AURORA_IS_XNU_DERIVED)
    #include <crt_externs.h>
#endif

namespace Aurora::CmdLine
{
    static AuList<AuString> gEntrypointString;

    AUKN_SYM void InitCommandLineArguments(int argc, const char **argv)
    {
        gEntrypointString.clear();

        for (int i = 0; i < argc; i++)
        {
            gEntrypointString.push_back(argv[0]);
        }
    }

#if defined(AURORA_IS_POSIX_DERIVED)
    static AuList<AuString> GetProcFSCmdString()
    {
        AuList<AuString> args;
        AuByteBuffer ret;
        
        AuIOFS::ReadFile("/proc/self/cmdline", ret);
        
        AuUInt idx {};
        for (int i = 0; i < ret.size(); i++)
        {
            if (ret[i] == 0)
            {
                if (i - idx)
                {
                    args.push_back(AuString(ret.begin() + idx, ret.begin() + i));
                }
                idx = i + 1;
            }
        }

        AuString last(ret.begin() + idx, ret.end());
        while (last.size() && !last[last.size() - 1])
        {
            last.pop_back();
        }

        if (last.size())
        {
            args.push_back(last);
        }

        return args;
    }
#endif

#if defined(AURORA_IS_MODERNNT_DERIVED)
    static AuList<AuString> GetCmdStringWin32()
    {
        AuList<AuString> ret;

        auto cmd = GetCommandLineW();
        SysAssert(cmd);
       
    #if defined(AURORA_PLATFORM_WIN32)

        int count {};
        auto temp = CommandLineToArgvW(cmd, &count);
        
        for (int i = 0; i < count; i++)
        {
            ret.push_back(Locale::ConvertFromWChar(temp[i]));
        }

    #else

        // https://github.com/wine-mirror/wine/blob/7ec5f555b05152dda53b149d5994152115e2c623/dlls/shell32/shell32_main.c#L58
        // https://github.com/dotnet/runtime/blob/2755362aed8412f47a3ca6cc419a9a85f55b0314/src/coreclr/src/utilcode/util.cpp#L2795
        // Yea, so, im not going to implement that. It isn't worth the energy

        // TODO: 
        // 
        // pass one -> split when str[i - 1] != '\\' && str[i] == ' '
        // sub pass -> if string begins and ends with quotes, cull -> substr(1, end - 2]
        // 
        // pass two -> iterate over all entries -> if contains evil char, AuReplaceAll(..., '\\' + char, char)
        //
        // copy to gEntrypointString
        //
        //
        // it'll be legal enough for UWP apps

    #endif

        
        return ret;
    }
#endif

#if defined(AURORA_IS_XNU_DERIVED)
    static void XNUSetEntrypointString()
    {
        InitCommandLineArguments(_NSGetArgc(), _NSGetArgv());
    }
#endif

    AuList<AuString> GetCmdString()
    {
        AuList<AuString> ret;

    #if defined(AURORA_IS_MODERNNT_DERIVED)
        ret = GetCmdStringWin32();
    #endif
    #if defined(AURORA_IS_POSIX_DERIVED)
        ret = GetProcFSCmdString();
    #endif
        if (ret.size())
        {
            return ret;
        }

        if (gEntrypointString.empty())
        {
        #if defined(AURORA_IS_XNU_DERIVED)
            XNUSetEntrypointString();
        #endif
        }

        return gEntrypointString;
    }
}