////////////////////////////////////////////////////////////////////////////////
// taskwarrior - a command line task list manager.
//
// Copyright 2010, Johannes Schlatow.
// All rights reserved.
//
// This program is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free Software
// Foundation; either version 2 of the License, or (at your option) any later
// version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
// FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
// details.
//
// You should have received a copy of the GNU General Public License along with
// this program; if not, write to the
//
//     Free Software Foundation, Inc.,
//     51 Franklin Street, Fifth Floor,
//     Boston, MA
//     02110-1301
//     USA
//
////////////////////////////////////////////////////////////////////////////////

#include <iostream>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/wait.h>
#include "Transport.h"
#include "TransportSSH.h"
#include "TransportRSYNC.h"
#include "TransportCurl.h"

////////////////////////////////////////////////////////////////////////////////
Transport::Transport (const std::string& host, const std::string& path, const std::string& user="", const std::string& port="")
{
  executable = "";
	this->host = host;
	this->path = path;
	this->user = user;
	this->port = port;
}

////////////////////////////////////////////////////////////////////////////////
Transport::Transport (const std::string& uri)
{
  executable = "";

	parseUri(uri);
}

////////////////////////////////////////////////////////////////////////////////
Transport::~Transport ()
{
}

////////////////////////////////////////////////////////////////////////////////
void Transport::parseUri(std::string uri)
{
  std::string::size_type pos;
	std::string uripart;
	std::string pathDelimiter = "/";

	user = "";
	port = "";

	// skip ^.*://
  if ((pos = uri.find ("://")) != std::string::npos)
	{
		protocol = uri.substr(0, pos);
		uri = uri.substr (pos+3);
		// standard syntax: protocol://[user@]host.xz[:port]/path/to/undo.data
		pathDelimiter = "/";
	}
	else
	{
		protocol = "ssh";
		// scp-like syntax: [user@]host.xz:path/to/undo.data
		pathDelimiter = ":";
	}

	// get host part
	if ((pos = uri.find (pathDelimiter)) != std::string::npos)
	{
		host = uri.substr (0, pos);
		path = uri.substr (pos+1);
	}
	else
	{
		throw std::string ("Could not parse \""+uri+"\"");
	}

	// parse host
	if ((pos = host.find ("@")) != std::string::npos)
	{
		user = host.substr (0, pos);
		host = host.substr (pos+1);
	}

	// remark: this find() will never be != npos for scp-like syntax
	// because we found pathDelimiter, which is ":", before
	if ((pos = host.find (":")) != std::string::npos)
	{
		port = host.substr (pos+1);
		host = host.substr (0,pos);
	}
}

////////////////////////////////////////////////////////////////////////////////
Transport* Transport::getTransport(const std::string& uri)
{
  if (uri.find("ssh://") == 0)
  {
    return new TransportSSH(uri);
  }
  else if (uri.find("rsync://") == 0)
  {
    return new TransportRSYNC(uri);
  }
  else if ( (uri.find("http://")  == 0)
         || (uri.find("https://") == 0)
         || (uri.find("ftp://")   == 0) )
  {
    return new TransportCurl(uri);		
  }
  else if ( (uri.find(":")   != std::string::npos) 
         && (uri.find("://") == std::string::npos) )
  {
    return new TransportSSH(uri);
  }

  return NULL;
}

////////////////////////////////////////////////////////////////////////////////
int Transport::execute()
{
  if (executable == "")
    return -1;

  pid_t child_pid = fork();

  if (child_pid == 0)
  {
    // this is done by the child process
    char shell[] = "sh";
    char opt[]   = "-c";

    std::string cmdline = executable;

    std::vector <std::string>::iterator it;
    for (it = arguments.begin(); it != arguments.end(); ++it)
    {
      std::string tmp = *it;
      cmdline += " " + tmp;
    }

    char** argv = new char*[4];
    argv[0] = shell;                  // sh
    argv[1] = opt;                    // -c
    argv[2] = (char*)cmdline.c_str();	// e.g. scp undo.data user@host:.task/
    argv[3] = NULL;                   // required by execv

    int ret = execvp("sh", argv);
    delete[] argv;

    exit(ret);
  }
  else
  {
    // this is done by the parent process
    int child_status;

    pid_t pid = waitpid(child_pid, &child_status, 0);

    if (pid == -1)
      return -1;
    else
      return child_status;
  }
}

////////////////////////////////////////////////////////////////////////////////