// TortoiseSVN - a Windows shell extension for easy version control

// Copyright (C) 2003-2008, 2012, 2019-2020 - TortoiseSVN

// 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.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software Foundation,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
#pragma once

#include "Containers/LogCacheGlobals.h"

using namespace LogCache;

class CVisibleGraphNode;

// Scintilla uses defines :/

#ifdef STYLE_DEFAULT
#undef STYLE_DEFAULT
#endif

/**
* Base interface to all layout info access interfaces.
*/

class ILayoutItemList
{
public:

    /// make sub-classes deletable through the base interface

    virtual ~ILayoutItemList() {};

    /// standard data access

    virtual index_t GetCount() const = 0;

    virtual CString GetToolTip (index_t index) const = 0;

    /// lookup (return NO_INDEX if not found)

    virtual index_t GetFirstVisible (const CRect& viewRect) const = 0;
    virtual index_t GetNextVisible (index_t prev, const CRect& viewRect) const = 0;
    virtual index_t GetAt (const CPoint& point, CSize delta) const = 0;
};

class ILayoutRectList : public ILayoutItemList
{
public:

    /// standard data access

    virtual CRect GetRect (index_t index) const = 0;
};

class ILayoutConnectionList : public ILayoutItemList
{
public:

    /// Connections are Bezier lines.

    struct SConnection
    {
        /// stype (usually pen) index.
        /// To be interpreted by drawing code. Starts with 0.

        index_t style;

        /// number of Bezier points valid in @ref points.

        index_t numberOfPoints;

        /// Bezier points to draw the curve for.

        const CPoint* points;
    };

    /// standard data access

    virtual SConnection GetConnection (index_t index) const = 0;
};

class ILayoutNodeList : public ILayoutItemList
{
public:

    /// Nodes occupy a rectangular area.

    struct SNode
    {
        /// style-flags

        enum
        {
            STYLE_DEFAULT     = 0,

            STYLE_ADDED       = 1,
            STYLE_DELETED     = 2,
            STYLE_RENAMED     = 3,
            STYLE_LAST        = 4,
            STYLE_MODIFIED    = 5,
            STYLE_MODIFIED_WC = 6
        };

        /// Area occupied by this node.

        CRect rect;

        /// tree node represented by this graphical node.
        /// Can be NULL, if there is none or multiple such nodes

        const CVisibleGraphNode* node;

        /// style (shape, border, filling) index.
        /// To be interpreted by drawing code. Starts with 0.

        index_t style;

        /// extended style info (usually presence of sub-structures).
        /// To be interpreted by drawing code. Starts with 0.

        DWORD styleFlags;

    };

    /// standard data access

    virtual SNode GetNode (index_t index) const = 0;
};

class ILayoutTextList : public ILayoutItemList
{
public:

    /// Texts occupy a rectangular area.

    struct SText
    {
        /// Values allowed for @a style

        enum
        {
            STYLE_DEFAULT   = 0,
            STYLE_HEADING   = 1,
            STYLE_WARNING   = 2
        };

        /// style (shape, font, size) index.
        /// To be interpreted by drawing code. Starts with 0.

        index_t style;

        /// style info (bold, etc.).
        /// To be interpreted by drawing code. Starts with 0.

        long rotation;

        /// The text.

        CString text;

        /// Area occupied by this text.

        CRect rect;
    };

    /// standard data access

    virtual SText GetText (index_t index, HWND hWnd) const = 0;
};

/** The 'graph' layout contains of three collections:
* One for the nodes, one for the connecting lines and
* one for the texts to be shown.
*
* The whole graph uses a discrete coordinate system
* confined in a rect.
*/

class IRevisionGraphLayout
{
public:

    /// make sub-classes deletable through the base interface

    virtual ~IRevisionGraphLayout() {};

    /// total graph size (logical units)

    virtual CRect GetRect() const = 0;

    /// access to the sub-structures.
    /// The caller is required to delete the return objects.

    virtual const ILayoutRectList* GetTrees() const = 0;
    virtual const ILayoutNodeList* GetNodes() const = 0;
    virtual const ILayoutConnectionList* GetConnections() const = 0;
    virtual const ILayoutTextList* GetTexts() const = 0;
};