/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla 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/MPL/
 *
 * 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.org code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 2002
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Srilatha Moturi <srilatha@netscape.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#include "nsCOMPtr.h"
#include "nsReadableUtils.h"
#include "nsIServiceManager.h"
#include "nsMsgBaseCID.h"
#include "nsMsgI18N.h"
#include "nsComm4xMail.h"
#include "nsIImportService.h"
#include "nsIImportMailboxDescriptor.h"
#include "nsComm4xMailStringBundle.h"
#include "nsComm4xMailImport.h"
#include "nsUnicharUtils.h"
#include "Comm4xMailDebugLog.h"
#include "prmem.h"
#include "nsNativeCharsetUtils.h"

#define	kCopyBufferSize		8192
#define	kMailReadBufferSize	16384


static PRBool
nsStringEndsWith(nsString& name, const char *ending)
{
    if (!ending) return PR_FALSE;

    PRInt32 len = name.Length();
    if (len == 0) return PR_FALSE;

    PRInt32 endingLen = strlen(ending);
    if (len > endingLen && name.RFind(ending, PR_TRUE) == len - endingLen) {
        return PR_TRUE;
    }
    else {
        return PR_FALSE;
    }
}

static PRBool
nsShouldIgnoreFile(nsString& name)
{
    PRUnichar firstChar=name.CharAt(0);
    if (firstChar == '.' || firstChar == '#' || name.CharAt(name.Length() - 1) == '~')
      return PR_TRUE;
 
    if (name.LowerCaseEqualsLiteral("rules.dat") || name.LowerCaseEqualsLiteral("rulesbackup.dat"))
        return PR_TRUE;
 
 
    // don't add summary files to the list of folders;
    // don't add popstate files to the list either, or rules (sort.dat). 
    if (nsStringEndsWith(name, ".snm") ||
        name.LowerCaseEqualsLiteral("popstate.dat") ||
        name.LowerCaseEqualsLiteral("sort.dat") ||
        name.LowerCaseEqualsLiteral("mailfilt.log") ||
        name.LowerCaseEqualsLiteral("filters.js") ||
        nsStringEndsWith(name, ".toc")||
        nsStringEndsWith(name,".sbd"))
        return PR_TRUE;
 
    return PR_FALSE;
}

nsComm4xMail::nsComm4xMail()
{
}

nsComm4xMail::~nsComm4xMail()
{
}

nsresult nsComm4xMail::FindMailboxes(nsIFileSpec *pRoot, nsISupportsArray **ppArray)
{
    nsresult rv = NS_NewISupportsArray(ppArray);
    if (NS_FAILED(rv)) {
        IMPORT_LOG0("FAILED to allocate the nsISupportsArray\n");
        return rv;
    }
        
    nsCOMPtr<nsIImportService> impSvc(do_GetService(NS_IMPORTSERVICE_CONTRACTID, &rv));
    if (NS_FAILED(rv))
        return rv;
    
    m_depth = 0;

    return (ScanMailDir(pRoot, *ppArray, impSvc));
}


nsresult nsComm4xMail::ScanMailDir(nsIFileSpec *pFolder, nsISupportsArray *pArray, nsIImportService *pImport)
{
    
    nsCOMPtr<nsIFileSpec>    descMap;
    nsresult                rv;

    if (NS_FAILED(rv = NS_NewFileSpec(getter_AddRefs(descMap))))
        return rv;

    m_depth++;

    descMap->FromFileSpec(pFolder);
    rv = IterateMailDir(pFolder, pArray, pImport);
    
    m_depth--;

    return rv;            
}

nsresult nsComm4xMail::IterateMailDir(nsIFileSpec *pFolder, nsISupportsArray *pArray, nsIImportService *pImport)
{
    nsCOMPtr<nsIDirectoryIterator>    dir;
    nsresult rv = NS_NewDirectoryIterator(getter_AddRefs(dir));
    if (NS_FAILED(rv))
        return rv;

    PRBool    exists = PR_FALSE;
    rv = dir->Init(pFolder, PR_TRUE);
    if (NS_FAILED(rv))
        return rv;

    rv = dir->Exists(&exists);
    if (NS_FAILED(rv))
        return rv;
    
    PRBool                    isFile;
    nsCOMPtr<nsIFileSpec>    entry;
    nsXPIDLCString                    pName;
    nsXPIDLCString                 dirName;
    nsAutoString currentFolderNameStr;
    PRBool                    isDirectory;
    nsAutoString ext;

    while (exists && NS_SUCCEEDED(rv)) {
        rv = dir->GetCurrentSpec(getter_AddRefs(entry));
        if (NS_SUCCEEDED(rv)) {
            rv = entry->GetLeafName(getter_Copies(pName));
            NS_CopyNativeToUnicode(pName, currentFolderNameStr);
            isFile = PR_FALSE;
            entry->IsFile(&isFile);
            if (isFile) {
                if (!nsShouldIgnoreFile(currentFolderNameStr)) {
                    rv = FoundMailbox(entry, &currentFolderNameStr, pArray, pImport);
                    if (NS_FAILED(rv))
                        return rv;
                    entry->GetNativePath(getter_Copies(dirName));
                    dirName.Append(".sbd");
                    rv = entry->SetNativePath(dirName.get());
                    if (NS_FAILED(rv))
                        return rv;
                    exists = PR_FALSE;
                    entry->Exists(&exists);
                    isDirectory = PR_FALSE;
                    entry->IsDirectory(&isDirectory);
                    if (exists && isDirectory) {
                        rv = ScanMailDir (entry, pArray, pImport);
                        if (NS_FAILED(rv))
                            return rv;
                    }

                }
            }
        }
        rv = dir->Next();
        if (NS_SUCCEEDED(rv))
            rv = dir->Exists(&exists);
    }

    return rv;
}

nsresult nsComm4xMail::FoundMailbox(nsIFileSpec *mailFile, nsAutoString *pName, nsISupportsArray *pArray, nsIImportService *pImport)
{
    nsCOMPtr<nsIImportMailboxDescriptor>    desc;

    nsXPIDLCString pPath;
    mailFile->GetNativePath(getter_Copies(pPath));
    if (!pPath.IsEmpty())
      IMPORT_LOG2("Found comm4x mailbox: %s, m_depth = %d\n", pPath.get(), m_depth);
    else
      IMPORT_LOG2("Can't get native path but found comm4x mailbox: %s, m_depth = %d\n", NS_ConvertUTF16toUTF8(*pName).get(), m_depth);

    nsresult rv = pImport->CreateNewMailboxDescriptor(getter_AddRefs(desc));
    if (NS_SUCCEEDED(rv)) {
        PRUint32        sz = 0;
        mailFile->GetFileSize(&sz);    
        desc->SetDisplayName(pName->get());
        desc->SetDepth(m_depth);
        desc->SetSize(sz);
        nsCOMPtr <nsIFileSpec> pSpec;
        desc->GetFileSpec(getter_AddRefs(pSpec));
        if (pSpec) {
            pSpec->FromFileSpec(mailFile);
        }
        nsCOMPtr <nsISupports> pInterface = do_QueryInterface(desc);
        if (pInterface)
            pArray->AppendElement(pInterface);
    }
    return NS_OK;
}