/****************************************************************************
For each file on the command line, launch it with its registered
application.  For Windows computers only.

Compiled and tested with the 3.2.3 version of the MinGW g++ compiler:
    g++ -o app.exe app.cpp


----------------------------------------------------------------------

Copyright (C) 2006 Don Peterson

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., 59 Temple Place, Suite 330,
Boston, MA 02111-1307  USA
****************************************************************************/

#include <iostream>
#include <string>
#include <cstdlib>
#include <windows.h>

using std::cerr;
using std::string;
using std::endl;

const string edit    = "edit";
const string explore = "explore";
const string find    = "find";
const string open    = "open";
const string print   = "print";

string program_name = "";

// ----------------------------------------------------------------------

void Usage(void)
{
    cerr << "Usage:  " << program_name 
         << " [-a action] file1 [file2...]" << endl
         << "Launches each file with its registered application." << endl
         << "  Actions are:" << endl
         << "    edit" << endl
         << "    explore" << endl
         << "    find" << endl
         << "    open (this is the default)" << endl
         << "    print" << endl;
    exit(1);
}

// ----------------------------------------------------------------------

void ErrorMessage(const char * file_to_launch, const string message)
{
    cerr << file_to_launch << ":  " << message << endl;
}

// ----------------------------------------------------------------------

void LaunchFile(const char * file_to_launch, const string action)
{
    const char * command_parameters = "";
    const char * working_directory  = "";    
    const int open_in_normal_window = 1;

    HINSTANCE ret = ShellExecute(
                                 0,
                                 action.c_str(),
                                 file_to_launch,
                                 command_parameters,
                                 working_directory,
                                 open_in_normal_window
                                );

    int return_value = int(ret);
    const int failed_status = 32;
    if (return_value > failed_status)
        return;  // Successfully executed

    // The call did not succeed; inform the user of the problem.  These
    // ShellExecute return values are from the MSDN help shipped with the
    // Visual C++ 2003 package.

    switch (return_value)
    {
        case 0:                    // Fall through intentional
        case SE_ERR_OOM:
            ErrorMessage(file_to_launch, "Out of memory");
            break;
        case ERROR_FILE_NOT_FOUND:
            ErrorMessage(file_to_launch, "File not found");
            break;
        case ERROR_PATH_NOT_FOUND:
            ErrorMessage(file_to_launch, "Path not found");
            break;
        case ERROR_BAD_FORMAT:
            ErrorMessage(file_to_launch, "EXE file is invalid");
            break;
        case SE_ERR_ACCESSDENIED:
            ErrorMessage(file_to_launch, "Access denied");
            break;
        case SE_ERR_ASSOCINCOMPLETE:
            ErrorMessage(file_to_launch, 
                         "File name association incomplete or invalid");
            break;
        case SE_ERR_DDEBUSY:
            ErrorMessage(file_to_launch, "DDE busy");
            break;
        case SE_ERR_DDEFAIL:
            ErrorMessage(file_to_launch, "DDE failed");
            break;
        case SE_ERR_DDETIMEOUT:
            ErrorMessage(file_to_launch, "DDE timed out");
            break;
        case SE_ERR_DLLNOTFOUND:
            ErrorMessage(file_to_launch, "DLL not found");
            break;
        case SE_ERR_NOASSOC:
            ErrorMessage(file_to_launch, 
                         "No application associated with file");
            break;
        case SE_ERR_SHARE:
            ErrorMessage(file_to_launch, "Sharing violation");
            break;
        default:
            break;
    }
}

int main(int argc, char** argv)
{
    program_name  = argv[0];
    string action = open;    // Default action is to open the file

    if (argc < 2)
        Usage();

    // Check for -a option
    argv++;
    if (argv[0][0] == '-' and argv[0][1] == 'a')
    {
        argv++;
        if (not *argv)
            Usage();

        // Make sure the action is allowed
        string action = *argv;
        if (action != edit    and 
            action != explore and 
            action != find    and 
            action != open    and 
            action != print)
        {
            Usage();
        }
        argv++;
        if (not *argv)
            // Need at least one file
            Usage();
    }

    while (*argv)
    {
        LaunchFile(*argv, action);
        argv++;
    }

	return 0;
}