/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * The contents of this file are subject to the Netscape Public
 * License Version 1.1 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.mozilla.org/NPL/
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * The Original Code is Mozilla Communicator client code, 
 * released March 31, 1998. 
 *
 * The Initial Developer of the Original Code is Netscape Communications 
 * Corporation.  Portions created by Netscape are
 * Copyright (C) 1998-1999 Netscape Communications Corporation. All
 * Rights Reserved.
 *
 * Contributor(s): 
 *     Don Bragg <dbragg@netscape.com>
 */

/*****************************************************************************
 * 
 * nsProcess is used to execute new processes and specify if you want to
 * wait (blocking) or continue (non-blocking).
 *
 *****************************************************************************
 */

#include "nsCOMPtr.h"
#include "nsMemory.h"
#include "nsProcess.h"
#include "prtypes.h"
#include "prio.h"

#include <stdlib.h>

//-------------------------------------------------------------------//
// nsIProcess implementation
//-------------------------------------------------------------------//
NS_IMPL_ISUPPORTS1(nsProcess, nsIProcess)

//Constructor
nsProcess::nsProcess():mExitValue(-1),
                       mProcess(nsnull)
{
    NS_INIT_ISUPPORTS();
}

nsProcess::~nsProcess()
{
}

NS_IMETHODIMP
nsProcess::Init(nsIFile* executable)
{
    PRBool isFile;

    //First make sure the file exists
    nsresult rv = executable->IsFile(&isFile);
    if (NS_FAILED(rv)) return rv;
    if (!isFile)
        return NS_ERROR_FAILURE;

    //Store the nsIFile in mExecutable
    mExecutable = executable;
    //Get the path because it is needed by the NSPR process creation
#ifdef XP_WIN 
    rv = mExecutable->GetTarget(getter_Copies(mTargetPath));
    if (NS_FAILED(rv) || !mTargetPath )
#endif
        rv = mExecutable->GetPath(getter_Copies(mTargetPath));

    return rv;
}


NS_IMETHODIMP  
nsProcess::Run(PRBool blocking, const char **args, PRUint32 count, PRUint32 *pid)
{
    nsresult rv = NS_OK;

    // make sure that when we allocate we have 1 greater than the
    // count since we need to null terminate the list for the argv to
    // pass into PR_CreateProcess
    char **my_argv = NULL;
    my_argv = (char **)malloc(sizeof(char *) * (count + 2) );
    if (!my_argv) {
        return NS_ERROR_OUT_OF_MEMORY;
    }

    // copy the args
    PRUint32 i;
    for (i=0; i < count; i++) {
        my_argv[i+1] = NS_CONST_CAST(char*, args[i]);
    }
    // we need to set argv[0] to the program name.
    my_argv[0] = NS_CONST_CAST(char*, mTargetPath.get());
    // null terminate the array
    my_argv[count+1] = NULL;

    if (blocking)
    {
        mProcess = PR_CreateProcess(mTargetPath, my_argv, NULL, NULL);
        if (mProcess)
            rv = PR_WaitProcess(mProcess, &mExitValue);
    }
    else
        rv = PR_CreateProcessDetached(mTargetPath, my_argv, NULL, NULL);

    // free up our argv
    nsMemory::Free(my_argv);

    if (rv != PR_SUCCESS)
        return NS_ERROR_FILE_EXECUTION_FAILED;
    return NS_OK;
}

NS_IMETHODIMP nsProcess::InitWithPid(PRUint32 pid)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
nsProcess::GetLocation(nsIFile** aLocation)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
nsProcess::GetPid(PRUint32 *aPid)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
nsProcess::GetProcessName(char** aProcessName)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
nsProcess::GetProcessSignature(PRUint32 *aProcessSignature)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
nsProcess::Kill()
{
    nsresult rv = NS_OK;
    if (mProcess)
        rv = PR_KillProcess(mProcess);
    
    return rv;
}

NS_IMETHODIMP
nsProcess::GetExitValue(PRInt32 *aExitValue)
{
    *aExitValue = mExitValue;
    
    return NS_OK;
}