/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0 .
 */
#pragma once

#include <sal/config.h>

#include <string_view>

#include <cppuhelper/implbase.hxx>
#include <osl/thread.h>
#include <osl/module.h>
#include <tools/stream.hxx>
#include <tools/link.hxx>
#include <sane/sane.h>

#include <com/sun/star/awt/XBitmap.hpp>
#include <com/sun/star/uno/Sequence.hxx>

using namespace com::sun::star::uno;


class BitmapTransporter: public cppu::WeakImplHelper<css::awt::XBitmap>
{
    SvMemoryStream                      m_aStream;
    osl::Mutex                          m_aProtector;

public:

                                        BitmapTransporter();
    virtual                             ~BitmapTransporter() override;

    virtual css::awt::Size SAL_CALL          getSize() override;
    virtual Sequence< sal_Int8 > SAL_CALL    getDIB() override;
    virtual Sequence< sal_Int8 > SAL_CALL    getMaskDIB() override { return Sequence< sal_Int8 >(); }

    // Misc
    void                                lock() { m_aProtector.acquire(); }
    void                                unlock() { m_aProtector.release(); }
    SvMemoryStream&                     getStream() { return m_aStream; }
};


class Sane
{
private:
    static int              nRefCount;
    static oslModule        pSaneLib;

    static SANE_Status      (*p_init)( SANE_Int*,
                                       SANE_Auth_Callback );
    static void             (*p_exit)();
    static SANE_Status      (*p_get_devices)( const SANE_Device***,
                                              SANE_Bool );
    static SANE_Status      (*p_open)( SANE_String_Const, SANE_Handle );
    static void             (*p_close)( SANE_Handle );
    static const SANE_Option_Descriptor* (*p_get_option_descriptor)(
        SANE_Handle, SANE_Int );
    static SANE_Status      (*p_control_option)( SANE_Handle, SANE_Int,
                                                 SANE_Action, void*,
                                                 SANE_Int* );
    static SANE_Status      (*p_get_parameters)( SANE_Handle,
                                                 SANE_Parameters* );
    static SANE_Status      (*p_start)( SANE_Handle );
    static SANE_Status      (*p_read)( SANE_Handle, SANE_Byte*, SANE_Int,
                                       SANE_Int* );
    static void             (*p_cancel)( SANE_Handle );
    static SANE_Status      (*p_set_io_mode)( SANE_Handle, SANE_Bool );
    static SANE_Status      (*p_get_select_fd)( SANE_Handle, SANE_Int* );
    static SANE_String_Const (*p_strstatus)( SANE_Status );

    static SANE_Int             nVersion;
    static SANE_Device**        ppDevices;
    static int                  nDevices;

    std::unique_ptr<const SANE_Option_Descriptor*[]> mppOptions;
    int                             mnOptions;
    int                             mnDevice;
    SANE_Handle                     maHandle;

    Link<Sane&,void>                maReloadOptionsLink;

    static inline oslGenericFunction
                    LoadSymbol( const char* );
    static void     Init();
    static void     DeInit();

    SANE_Status ControlOption( int, SANE_Action, void* );

    bool CheckConsistency( const char*, bool bInit = false );

public:
    Sane();
    ~Sane();

    static bool         IsSane()
        { return pSaneLib != nullptr; }
    bool            IsOpen() const
        { return maHandle != nullptr; }
    static int              CountDevices()
        { return nDevices; }
    static OUString         GetName( int n )
        { return ppDevices[n]->name ? OUString( ppDevices[n]->name, strlen(ppDevices[n]->name),  osl_getThreadTextEncoding() ) : OUString(); }
    static OUString         GetVendor( int n )
        { return ppDevices[n]->vendor ? OUString( ppDevices[n]->vendor, strlen(ppDevices[n]->vendor), osl_getThreadTextEncoding() ) : OUString(); }
    static OUString         GetModel( int n )
        { return ppDevices[n]->model ? OUString( ppDevices[n]->model, strlen(ppDevices[n]->model), osl_getThreadTextEncoding() ) : OUString(); }
    static OUString         GetType( int n )
        { return ppDevices[n]->type ? OUString( ppDevices[n]->type, strlen(ppDevices[n]->type), osl_getThreadTextEncoding() ) : OUString(); }

    OUString        GetOptionName( int n )
        { return mppOptions[n]->name ? OUString( mppOptions[n]->name, strlen(mppOptions[n]->name), osl_getThreadTextEncoding() ) : OUString(); }
    OUString        GetOptionTitle( int n )
        { return mppOptions[n]->title ? OUString( mppOptions[n]->title, strlen(mppOptions[n]->title), osl_getThreadTextEncoding() ) : OUString(); }
    SANE_Value_Type GetOptionType( int n )
        { return mppOptions[n]->type; }
    SANE_Unit       GetOptionUnit( int n )
        { return mppOptions[n]->unit; }
    OUString        GetOptionUnitName( int n );
    SANE_Int        GetOptionCap( int n )
        { return mppOptions[n]->cap; }
    SANE_Constraint_Type GetOptionConstraintType( int n )
        { return mppOptions[n]->constraint_type; }
    const char**    GetStringConstraint( int n )
        { return const_cast<const char**>(mppOptions[n]->constraint.string_list); }
    int             GetRange( int, std::unique_ptr<double[]>& );

    inline int      GetOptionElements( int n );
    int             GetOptionByName( const char* );
    bool            GetOptionValue( int, bool& );
    bool            GetOptionValue( int, OString& );
    bool            GetOptionValue( int, double&, int nElement = 0 );
    bool            GetOptionValue( int, double* );

    void            SetOptionValue( int, bool );
    void            SetOptionValue( int, std::u16string_view );
    void            SetOptionValue( int, double, int nElement = 0 );
    void            SetOptionValue( int, double const * );

    bool            ActivateButtonOption( int );

    int             CountOptions() { return mnOptions; }
    int             GetDeviceNumber() const { return mnDevice; }

    bool            Open( const char* );
    bool            Open( int );
    void            Close();
    void            ReloadDevices();
    void            ReloadOptions();

    bool            Start( BitmapTransporter& );

    inline Link<Sane&,void>   SetReloadOptionsHdl( const Link<Sane&,void>& rLink );
};


inline int Sane::GetOptionElements( int n )
{
    if( mppOptions[n]->type == SANE_TYPE_FIXED ||
        mppOptions[n]->type == SANE_TYPE_INT )
    {
        return mppOptions[n]->size/sizeof( SANE_Word );
    }
    return 1;
}


inline Link<Sane&,void> Sane::SetReloadOptionsHdl( const Link<Sane&,void>& rLink )
{
    Link<Sane&,void> aRet = maReloadOptionsLink;
    maReloadOptionsLink = rLink;
    return aRet;
}

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