/***************************************************************************
                          sq_libraryhandler.cpp  -  description
                             -------------------
    begin                : Mar 5 2004
    copyright            : (C) 2004 by Baryshev Dmitry
    email                : ksquirrel.iv@gmail.com
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   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.                                   *
 *                                                                         *
 ***************************************************************************/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <tqlibrary.h>
#include <tqfileinfo.h>
#include <tqstringlist.h>
#include <tqfile.h>
#include <tqdir.h>

#include <kstringhandler.h>
#include <tdetempfile.h>
#include <tdeconfig.h>
#include <tdelocale.h>
#include <kdebug.h>
#include <kurl.h>
#include <kmimetype.h>

#include "sq_libraryhandler.h"
#include "sq_config.h"

#include <ksquirrel-libs/fmt_codec_base.h>

#include <iostream>
#include <iomanip>

#if !defined(QT_STRINGIFY)
# define QT_STRINGIFY2(x) #x
# define QT_STRINGIFY(x) QT_STRINGIFY2(x)
#endif

static const int buffer_size = 10;

SQ_LibraryHandler * SQ_LibraryHandler::m_instance = 0;

// SQ_LibraryHandler
SQ_LibraryHandler::SQ_LibraryHandler(TQObject *parent) 
    : TQObject(parent), TQValueVector<SQ_LIBRARY>()
{
    m_instance = this;

    kdDebug() << "+SQ_LibraryHandler" << endl;

    tdeconf = new TDEConfig("ksquirrel-codec-settings");

    load();
}

SQ_LibraryHandler::~SQ_LibraryHandler()
{
    clear();

    delete tdeconf;

    kdDebug() << "-SQ_LibraryHandler" << endl;
}

/*
 *  Find appropriate SQ_LIBRARY by filename. If
 *  not found, return NULL.
 */
SQ_LIBRARY* SQ_LibraryHandler::libraryForFile(const KURL &url)
{
    KMimeType::Ptr mime = KMimeType::findByURL(url);

    iterator itEnd = end();

    SQ_LIBRARY *l = 0;

    // go through array and compare names
    for(iterator it = begin();it != itEnd;++it)
    {
        if((*it).mime_multi)
        {
            if((*it).mimetype.find(mime->name()) != -1)
            {
                l = &(*it);
                break;
            }
        }
        else if((*it).mimetype == mime->name())
        {
            l = &(*it);
            break;
        }
    }

#if 0
    if(l)
        kdDebug() << KStringHandler::lsqueeze(url.prettyURL())
                  << "\" => "
                  << l->quickinfo
                  << endl;
#endif

    return l;
}

SQ_LIBRARY* SQ_LibraryHandler::libraryForFile(const TQString &path)
{
    KURL u;
    u.setPath(path);

    return libraryForFile(u);
}

/*
 *  Get all filters as one string.
 */
TQString SQ_LibraryHandler::allFiltersString() const
{
    TQString ret;

    const_iterator itEnd = end();

    // construct string
    for(const_iterator it = begin();it != itEnd;++it)
    {
        if(!(*it).filter.isEmpty())
            ret = ret + (*it).filter + ' ';
    }

    return ret;
}

TQString SQ_LibraryHandler::allFiltersFileDialogString(bool r, bool allfiles) const
{
    TQString ret;

    const_iterator itEnd = end();

    // construct string
    for(const_iterator it = begin();it != itEnd;++it)
    {
        if(!r)
            if((*it).writestatic)
                ret = ret + (*it).filter + '|' + (*it).quickinfo + '\n';
            else;
        else if((*it).readable)
            ret = ret + (*it).filter + '|' + (*it).quickinfo + '\n';
    }

    return allfiles ? (ret + "*.*|" + i18n("All files")) : ret.left(ret.length() - 1);
}

/*
 *  Fill 'filters' with all found filters, and
 *  'quick' with appropriate information.
 */
void SQ_LibraryHandler::allFilters(TQStringList &filters, TQStringList &quick) const
{
    // clear rubbish
    filters.clear();
    quick.clear();

    // no found libraries ?
    if(empty())
        return;

    const_iterator itEnd = end();

    // go through array and fill TQStringLists
    for(const_iterator it = begin();it != itEnd;++it)
        if(!(*it).filter.isEmpty())
        {
            filters.append((*it).filter);
            quick.append((*it).quickinfo);
        }
}

void SQ_LibraryHandler::allWritableFilters(TQStringList &filters, TQStringList &quick) const
{
    // clear rubbish
    filters.clear();
    quick.clear();

    // no libraries ?
    if(empty())
        return;

    const_iterator itEnd = end();

    // go through array and fill TQStringLists
    for(const_iterator it = begin();it != itEnd;++it)
        if((*it).writestatic && !(*it).filter.isEmpty())
        {
            filters.append((*it).filter);
            quick.append((*it).quickinfo);
        }
}

/*
 *  Remove and unload all libraries.
 */
void SQ_LibraryHandler::clear()
{
    kdDebug() << "SQ_LibraryHandler::clear()" << endl;

    iterator itEnd = end();

    // unload libraries on clear()
    for(iterator it = begin();it != itEnd;++it)
    {
        writeSettings(&(*it));

        // delete temp file
        if((*it).needtempfile)
        {
            delete (*it).tmp_il;
            delete (*it).tmp;
        }

        (*it).codec_destroy((*it).codec_il);
        (*it).codec_destroy((*it).codec);
        delete (*it).lib;
        (*it).lib = 0;
    }

    TQValueVector<SQ_LIBRARY>::clear();
}

/*
 *  Add new libraries.
 */
void SQ_LibraryHandler::add(TQStringList &foundLibraries)
{
    codec_options o;

    TQStringList::iterator itEnd = foundLibraries.end();

    for(TQStringList::iterator it = foundLibraries.begin();it != itEnd;++it)
    {
        TQFileInfo ff(*it);

        SQ_LIBRARY libtmp;

        // create TQLibrary object
        libtmp.lib = new TQLibrary(*it);
        libtmp.libpath = *it;
        libtmp.lib->load();

        // resolve create() and destroy() functions
        libtmp.codec_create = (fmt_codec_base*(*)())(libtmp.lib)->resolve(TQString::fromLatin1("codec_create"));
        libtmp.codec_destroy = (void (*)(fmt_codec_base*))(libtmp.lib)->resolve(TQString::fromLatin1("codec_destroy"));

        // couldn't resolve - corrupted library ?
        if(!libtmp.codec_create || !libtmp.codec_destroy)
        {
            libtmp.lib->unload();
            delete libtmp.lib;
        }
        else
        {
            // create codec !
            fmt_codec_base *codeK = libtmp.codec_create();

            // read options
            codeK->options(&o);

            TQString q = o.name;

            // Yet unknown library ?
            if(!alreadyInMap(q))
            {
                libtmp.mime = TQPixmap(reinterpret_cast<const char **>(o.pixmap));
                libtmp.mimetype = o.mimetype;
                libtmp.mime_multi = libtmp.mimetype.find(';') != -1;
                libtmp.quickinfo = q;
                libtmp.filter = o.filter;
                libtmp.version = o.version;
                libtmp.regexp_str = o.mime;
                libtmp.config = o.config;
                libtmp.regexp.setPattern(libtmp.regexp_str);
                libtmp.regexp.setCaseSensitive(true);
                libtmp.writestatic = o.writestatic;
                libtmp.writeanimated = o.writeanimated;
                libtmp.readable = o.readable;
                libtmp.canbemultiple = o.canbemultiple;
                libtmp.needtempfile = o.needtempfile;
                libtmp.tmp = 0;

                libtmp.codec_il = libtmp.codec_create();

                if(libtmp.needtempfile)
                {
                    libtmp.tmp = new KTempFile;
                    libtmp.tmp->setAutoDelete(true);
                    libtmp.tmp->close();
                    codeK->settempfile(libtmp.tmp->name().ascii());

                    libtmp.tmp_il = new KTempFile;
                    libtmp.tmp_il->setAutoDelete(true);
                    libtmp.tmp_il->close();
                    libtmp.codec_il->settempfile(libtmp.tmp_il->name().ascii());
                }

                if(libtmp.writestatic)
                    codeK->getwriteoptions(&libtmp.opt);

                libtmp.codec = codeK;

                readSettings(&libtmp);

                append(libtmp);
            }
            else // already known library
            {
                // destroy codec
                libtmp.codec_destroy(codeK);

                // unload library
                libtmp.lib->unload();

                delete libtmp.lib;
            }
        }
    }

    // print some information
    dump();
}

/*
 *  Is library named 'quick' already been handled ?
 */
bool SQ_LibraryHandler::alreadyInMap(const TQString &quick) const
{
    const_iterator itEnd = end();

    // go through array and find 'quick'
    for(const_iterator it = begin();it != itEnd;++it)
        if((*it).quickinfo == quick)
            return true;

    return false;
}

/*
 *  Print some information on found libraries.
 */
void SQ_LibraryHandler::dump() const
{
    std::cerr << "SQ_LibraryHandler: memory dump (total " << count() << ")" << endl;

    const_iterator itEnd = end();

    std::cerr.setf(ios::left);

    for(const_iterator it = begin();it != itEnd;++it)
    {
        std::cerr << std::setw(30)
                  << KStringHandler::csqueeze(TQFileInfo((*it).libpath).fileName(), 30)
                  << std::setw(0)
                  << "  [" 
                  << KStringHandler::rsqueeze((*it).quickinfo, 45)
                  << "]"
                  << endl;
    }
}

/*
 *  Does any of found libraries handle given extension ?
 */
bool SQ_LibraryHandler::knownExtension(const TQString &ext)
{
    iterator itEnd = end();

    // go through array and compare extensions
    for(iterator it = begin();it != itEnd;++it)
    {
        if((*it).filter.contains(ext, false))
            return true;
    }

    return false;
}

/*
 *  Find appropriate SQ_LIBRARY by its name. If
 *  not found, return NULL.
 *
 *  Name is a string, returned by fmt_quickinfo()
 */
SQ_LIBRARY* SQ_LibraryHandler::libraryByName(const TQString &name)
{
    SQ_LIBRARY *l;

    iterator itEnd = end();

    // go through array and compare names
    for(iterator it = begin();it != itEnd;++it)
    {
        l = &(*it);

        if(l->quickinfo == name)
            return l;
    }

    return 0;
}

void SQ_LibraryHandler::writeSettings(SQ_LIBRARY *lib)
{
    // no config - no settings
    if(lib->config.isEmpty())
        return;

    tdeconf->setGroup(lib->quickinfo);

    fmt_settings::iterator itEnd = lib->settings.end();

    TQString k;

    for(fmt_settings::iterator it = lib->settings.begin();it != itEnd;++it)
    {
        k = (*it).first;

        if((*it).second.type == settings_value::v_bool) // boolean
        {
           k.prepend("b");
           tdeconf->writeEntry(k, (*it).second.bVal);
        }
        else if((*it).second.type == settings_value::v_int) // integer
        {
            k.prepend("i");
            tdeconf->writeEntry(k, (*it).second.iVal);
        }
        else if((*it).second.type == settings_value::v_double) // double
         {
             k.prepend("d");
             tdeconf->writeEntry(k, (*it).second.dVal);
         }
        else // string
        {
            k.prepend("s");
            tdeconf->writeEntry(k, (*it).second.sVal);
        }
    }
}

void SQ_LibraryHandler::readSettings(SQ_LIBRARY *lib)
{
    // no config - no settings
    if(lib->config.isEmpty())
        return;

    TQMap<TQString, TQString> map = tdeconf->entryMap(lib->quickinfo);

    if(!map.size())
    {
        lib->codec->fill_default_settings();
        lib->settings = lib->codec->settings();
        return;
    }

    TQMap<TQString, TQString>::iterator mapEnd = map.end();
    fmt_settings &sett = lib->settings;
    TQString d, k;
    settings_value val;

    for(TQMap<TQString, TQString>::iterator mapIt = map.begin();mapIt != mapEnd;++mapIt)
    {
        k = mapIt.key();
        d = mapIt.data();

        if(k.startsWith(TQChar('i')))
        {
            val.type = settings_value::v_int;
            val.iVal = d.toInt();
        }
        else if(k.startsWith(TQChar('d')))
        {
            val.type = settings_value::v_double;
            val.dVal = d.toDouble();
        }
        else if(k.startsWith(TQChar('b')))
        {
            val.type = settings_value::v_bool;
            val.bVal = (d == "true");
        }
        else // all other values are treated as strings
        {
            val.type = settings_value::v_string;
            val.sVal = d.ascii();
        }

        k = k.right(k.length() - 1);
        sett[k.ascii()] = val;
    }

    lib->codec->set_settings(sett);
}

void SQ_LibraryHandler::reload()
{
    clear();
    load();
}

void SQ_LibraryHandler::load()
{
    TQStringList libs;

    TQDir dir(QT_STRINGIFY(SQ_KLIBS), TQString(), TQDir::Unsorted, TQDir::Files);

    const TQFileInfoList *list = dir.entryInfoList();

    if(list)
    {
        TQFileInfoListIterator it(*list);
        TQFileInfo *fi;

        while((fi = it.current()) != 0)
        {
            libs.append(fi->absFilePath());
            ++it;
        }
    }

    // just show dump, if no libs were found
    add(libs);
}

SQ_LibraryHandler::Support SQ_LibraryHandler::maybeSupported(const KURL &u, const TQString &mime) const
{
    const_iterator itEnd = constEnd();

    SQ_Config::instance()->setGroup("Main");
    bool treat =  SQ_Config::instance()->readBoolEntry("treat", true);

    // we can determine mimetype by hand or use "mime"
    TQString mimeDet = mime.isEmpty() ? KMimeType::findByURL(u)->name() : mime;

    // mimetype by magic is not determined automatically
    // for non-local urls - we may support this file type or may not
    // (we don't know exactly at this moment)
    if(!u.isLocalFile() && mimeDet == KMimeType::defaultMimeType())
        return (treat ? SQ_LibraryHandler::No : SQ_LibraryHandler::Maybe);

    // go through array and compare mimetype names
    for(const_iterator it = constBegin();it != itEnd;++it)
    {
        if((*it).mime_multi)
        {
            if((*it).mimetype.find(mimeDet, 0, false) != -1)
                return SQ_LibraryHandler::Yes;
        }
        else if((*it).mimetype == mimeDet) // don't waste CPU time with find()
            return SQ_LibraryHandler::Yes;
    }

    // we don't know about given mimetype
    return SQ_LibraryHandler::No;
}

void SQ_LibraryHandler::sync()
{
    iterator itEnd = end();

    // unload libraries on clear()
    for(iterator it = begin();it != itEnd;++it)
        writeSettings(&(*it));

    tdeconf->sync();
}