#include <nntpchan/exec_frontend.hpp>
#include <cstring>
#include <iostream>
#include <errno.h>
#include <unistd.h>
#include <sys/wait.h>

namespace nntpchan
{
  ExecFrontend::ExecFrontend(const std::string & fname) :
    m_exec(fname)
  {
  }

  ExecFrontend::~ExecFrontend() {}

  void ExecFrontend::ProcessNewMessage(const fs::path  & fpath)
  {
    Exec({"post", fpath});
  }

  bool ExecFrontend::AcceptsNewsgroup(const std::string & newsgroup)
  {
    return Exec({"newsgroup", newsgroup}) == 0;
  }

  bool ExecFrontend::AcceptsMessage(const std::string & msgid)
  {
    return Exec({"msgid", msgid}) == 0;
  }

  int ExecFrontend::Exec(std::deque<std::string> args)
  {
    // set up arguments
    const char ** cargs = new char const *[args.size() +2];
    std::size_t l = 0;
    cargs[l++] = m_exec.c_str();
    while (args.size()) {
      cargs[l++] = args.front().c_str();
      args.pop_front();
    }
    cargs[l] = 0;
    int retcode = 0;
    pid_t child = fork();
    if(child) {
      waitpid(child, &retcode, 0);
    } else {
      int r = execvpe(m_exec.c_str(),(char * const *) cargs, environ);
      if ( r == -1 ) {
        std::cout << strerror(errno) << std::endl;
        exit( errno );
      } else
        exit(r);
    }
    return retcode;
  }
}