/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * The contents of this file are subject to the Netscape Public License
 * Version 1.0 (the "NPL"); you may not use this file except in
 * compliance with the NPL.  You may obtain a copy of the NPL at
 * http://www.mozilla.org/NPL/
 *
 * Software distributed under the NPL is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
 * for the specific language governing rights and limitations under the
 * NPL.
 *
 * The Initial Developer of this code under the NPL is Netscape
 * Communications Corporation.  Portions created by Netscape are
 * Copyright (C) 1998 Netscape Communications Corporation.  All Rights
 * Reserved.
 */

#include "nsCachePref.h"
#ifndef XP_UNIX
#include "xp.h" // This complains on unix. Works ok without there.
#endif
#include "prefapi.h"
#include "prmem.h"
#include "nsCacheManager.h"
#include "plstr.h"
#if defined(XP_PC)
#include <direct.h>
#include "nspr.h"
#endif /* XP_PC */

#ifdef XP_MAC
#include "uprefd.h"
#endif


static const PRUint32 MEM_CACHE_SIZE_DEFAULT = 1024*1024;
static const PRUint32 DISK_CACHE_SIZE_DEFAULT = 5*MEM_CACHE_SIZE_DEFAULT;
static const PRUint32 BKG_THREAD_SLEEP = 15*60; /*in seconds, 15 minutes */
static const PRUint16 BUGS_FOUND_SO_FAR = 0;

//Preferences
static const char * const MEM_CACHE_PREF   = "browser.cache.memory_cache_size";
static const char * const DISK_CACHE_PREF  = "browser.cache.disk_cache_size";
static const char * const CACHE_DIR_PREF   = "browser.cache.directory";
static const char * const FREQ_PREF        = "browser.cache.check_doc_frequency";
//Not implemented as yet...
static const char * const BKG_CLEANUP      = "browser.cache.cleanup_period"; //Default for BKG_THREAD_SLEEP	

/* Find a bug in NU_CACHE, get these many chocolates */
static const PRUint16 CHOCOLATES_PER_BUG_FOUND = 2^BUGS_FOUND_SO_FAR; 

static int PR_CALLBACK Cache_PrefChangedFunc(const char *pref, void *data);

nsCachePref::nsCachePref(void):
    m_BkgSleepTime(BKG_THREAD_SLEEP),
    m_DiskCacheDBFilename(new char[6+1]),
    m_DiskCacheFolder(0),
    m_DiskCacheSize(DISK_CACHE_SIZE_DEFAULT),
    m_MemCacheSize(MEM_CACHE_SIZE_DEFAULT),
    m_RefreshFreq(ONCE)
{
    PREF_RegisterCallback("browser.cache",Cache_PrefChangedFunc,0); 
    SetupPrefs(0);
}

nsCachePref::~nsCachePref()
{
    if (m_DiskCacheFolder)
    {
        delete m_DiskCacheFolder;
        m_DiskCacheFolder = 0;
    }
}

//Read all the stuff from pref here. 
void
nsCachePref::SetupPrefs(const char* i_Pref)
{
    PRBool bSetupAll = PR_FALSE;
    
    PRInt32 nTemp;
    char* tempPref=0;

    if (!i_Pref)
        bSetupAll = PR_TRUE;

    if (bSetupAll || !PL_strcmp(i_Pref,MEM_CACHE_PREF)) 
    {
        if (PREF_OK == PREF_GetIntPref(MEM_CACHE_PREF,&nTemp))
            m_MemCacheSize = 1024*nTemp;
        else
            m_MemCacheSize = MEM_CACHE_SIZE_DEFAULT;
    }

    if (bSetupAll || !PL_strcmp(i_Pref,DISK_CACHE_PREF)) 
    {
        if (PREF_OK == PREF_GetIntPref(DISK_CACHE_PREF,&nTemp))
            m_DiskCacheSize = 1024*nTemp;
        else
            m_DiskCacheSize = DISK_CACHE_SIZE_DEFAULT;
    }

    if (bSetupAll || !PL_strcmp(i_Pref,FREQ_PREF)) 
    {
        if (PREF_OK == PREF_GetIntPref(FREQ_PREF,&nTemp))
        {
            m_RefreshFreq = (nsCachePref::Refresh)nTemp;
        }
        else
            m_RefreshFreq = ONCE;
    }

    if (bSetupAll || !PL_strcmp(i_Pref,CACHE_DIR_PREF)) 
    {
	    if (PREF_OK == PREF_CopyPathPref(CACHE_DIR_PREF,&tempPref))
        {
            PR_ASSERT(tempPref);
            delete [] m_DiskCacheFolder;
			m_DiskCacheFolder =  new char[PL_strlen(tempPref)+2];
	        if (!m_DiskCacheFolder)
	        {
	            if (tempPref)
	                PR_Free(tempPref);
	            return;
	        }
            PL_strcpy(m_DiskCacheFolder, tempPref);
	    }
        else //TODO set to temp folder
        {
#if defined(XP_PC)
            char tmpBuf[_MAX_PATH];
            PRFileInfo dir;
            PRStatus status;
            char *cacheDir = new char [_MAX_PATH];
            if (!cacheDir)
                return;
            cacheDir = _getcwd(cacheDir, _MAX_PATH);

            // setup the cache dir.
            PL_strcpy(tmpBuf, cacheDir);
            sprintf(cacheDir,"%s%s%s%s", tmpBuf, "\\", "cache", "\\");
            status = PR_GetFileInfo(cacheDir, &dir);
            if (PR_FAILURE == status) {
                // Create the dir.
                status = PR_MkDir(cacheDir, 0600);
                if (PR_SUCCESS != status) {
                    m_DiskCacheFolder = new char[1];
					*m_DiskCacheFolder = '\0';
                    return;
                }
            }
            m_DiskCacheFolder = cacheDir;
#endif /* XP_PC */
        }
    }

    if (tempPref)
        PR_Free(tempPref);
}

const PRUint32  
nsCachePref::BkgSleepTime(void)
{
    return BKG_THREAD_SLEEP; 
}

const char* nsCachePref::DiskCacheDBFilename(void)
{
    return "nufat.db";
}

nsCachePref* nsCachePref::GetInstance()
{
    PR_ASSERT(nsCacheManager::GetInstance()->GetPrefs());
    return nsCacheManager::GetInstance()->GetPrefs();
}

/*
nsrefcnt nsCachePref::AddRef(void)
{
    return ++m_RefCnt;
}
nsrefcnt nsCachePref::Release(void)
{
    if (--m_RefCnt == 0)
    {
        delete this;
        return 0;
    }
    return m_RefCnt;
}

nsresult nsCachePref::QueryInterface(const nsIID& aIID,
                                        void** aInstancePtrResult)
{
    return NS_OK;
}
*/

int PR_CALLBACK Cache_PrefChangedFunc(const char *pref, void *data) {
    nsCachePref::GetInstance()->SetupPrefs(pref);
	return PR_TRUE;
}