/******************************************************************************
* Copyright (c) 2013 Jørgen Lind
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
******************************************************************************/

#ifndef SCROLLBACK_H
#define SCROLLBACK_H

#include <set>
#include <list>

#include <QtCore/qglobal.h>
class ScreenData;
class Block;

struct Page {
    int page_no;
    int size;
    std::list<Block *>::iterator it;
};

class Scrollback
{
public:
    Scrollback(size_t max_size, ScreenData *screen_data);

    void addBlock(Block *block);
    Block *reclaimBlock();
    void ensureVisiblePages(int top_line);

    size_t height() const;

    void setWidth(int width);

    size_t blockCount() { return m_block_count; }
private:
    void ensurePageVisible(Page &page, int new_height);
    void ensurePageNotVisible(Page &page);
    std::list<Block *>::iterator findIteratorForPage(int page_no);
    void adjustVisiblePages();
    ScreenData *m_screen_data;

    std::list<Block *> m_blocks;
    std::list<Page> m_visible_pages;
    size_t m_height;
    size_t m_width;
    size_t m_block_count;
    size_t m_max_size;
    size_t m_adjust_visible_pages;
};

#endif //SCROLLBACK_H