#include "tempfile.h"

#include "exceptionstream.h"

#include <stdexcept>

#include <errno.h>
#include <assert.h>
#include <stdio.h>

temp_file_t::temp_file_t()
:
stream(),
filename()
{
    /* openbsd linker warns about using tmpnam/mktemp. would like
        to use mkstemp but fstream's open method only takes filename,
        and using fstream's ctr doesn't allow us to get access to
        the filenae...*/
    this->open( tmpnam( NULL));
}
temp_file_t::temp_file_t( const std::string& filename)
:
stream(),
filename()
{
    open( filename);
}

temp_file_t::~temp_file_t()
{
    this->close();
}

std::ofstream   stream;
std::string     filename;


void    temp_file_t::close_and_move( const std::string& newfilename)
/* Useful for moving a file to a different filename if
creation has been successful. i.e. commit/rollback.*/
{
    this->stream.close();
    assert( this->filename != "");
    if ( system( (std::string() + "mv " + this->filename + " " + newfilename).c_str()))
    {
        throw exception_stream() << "Couldn't move `" 
            << this->filename << "' to `" 
            << newfilename + "'";
    }
    this->filename = "";
}
void    temp_file_t::open( const std::string& newfilename)
{
    this->close();
    this->filename = newfilename;
    this->stream.open( this->filename.c_str());
    if ( !this->stream)    throw std::runtime_error( std::string( "Couldn't open temp file ") + this->filename);
}
void    temp_file_t::close()
{
    // gcc3.2/stlport makes stream invalid if we close it when it is not already open.
    if ( this->stream.is_open())    this->stream.close();
    if ( !this->filename.empty())    remove( this->filename.c_str());
}