//
// php-armadillo/stream_utils.hh
//
// @Author CismonX
//

#ifndef PHP_ARMA_STREAM_UTILS_HH
#define PHP_ARMA_STREAM_UTILS_HH

#include "php_arma.hh"

#ifdef __GLIBCXX__

#include <ext/stdio_filebuf.h>

#define Z_ISTREAM_P(zval_p, name)                                               \
    __gnu_cxx::stdio_filebuf<char> _filebuf(zval_to_fd(zval_p), std::ios::in);  \
    std::istream name(&_filebuf)

#define Z_OSTREAM_P(zval_p, name)                                               \
    __gnu_cxx::stdio_filebuf<char> _filebuf(zval_to_fd(zval_p), std::ios::out); \
    std::ostream name(&_filebuf)

#else

#define Z_ISTREAM_P(zval_p, name)                                               \
    extern std::istream name;                                                   \
    zval_to_iostream_unsupported()
#define Z_OSTREAM_P(zval_p, name)                                               \
    extern std::ostream name;                                                   \
    zval_to_iostream_unsupported()
    
#endif // __GLIBCXX__

namespace php_arma
{
#ifdef __GLIBCXX__
    zend_always_inline
    int zval_to_fd(zval *zv)
    {
        auto stream = reinterpret_cast<php_stream*>(zend_fetch_resource2_ex(
            zv, "stream", php_file_le_stream(), php_file_le_pstream()));
        if (stream == nullptr) {
            return -1;
        }
        struct {
            FILE *file;
            int   fd;
        } *stream_data = reinterpret_cast<decltype(stream_data)>(stream->abstract);
        return stream_data->fd;
    }

    constexpr auto zval_to_iostream_supported = true;
#else
    zend_always_inline
    void zval_to_iostream_unsupported()
    {
        throw_exception_ex(zend_ce_type_error, "resource is not yet supported, use file name instead, "
            "or re-compile php-armadillo and link with libstdc++.");
    }

    constexpr auto zval_to_iostream_supported = false;
#endif // __GLIBCXX__
}

#endif // !PHP_ARMA_STREAM_UTILS_HH