/*---------------------------------------------------------------------------*
  Project:  Horizon
  File:     scrollBuffer.cpp

  Copyright (C)2009 Nintendo Co., Ltd.  All rights reserved.

  These coded instructions, statements, and computer programs contain
  proprietary information of Nintendo of America Inc. and/or Nintendo
  Company Ltd., and are protected by Federal copyright law.  They may
  not be disclosed to third parties or copied or duplicated in any form,
  in whole or in part, without the prior written consent of Nintendo.

  $Rev$
 *---------------------------------------------------------------------------*/

#include <cstdio>
#include "scrollBuffer.h"

using namespace std;

char ScrollBuffer::s_buffers[MAX_BUFFER_LINE][MAX_BUFFER_CHARS];

char *ScrollBuffer::GetFormattedString(const char *fmt, va_list arg)
{
    static char formattedBuffer[MAX_BUFFER_CHARS];
    vsnprintf(formattedBuffer, MAX_BUFFER_CHARS, fmt, arg);
    return formattedBuffer;
}

ScrollBuffer *ScrollBuffer::Update()
{
    return this;
}

ScrollBuffer *ScrollBuffer::AppendText(const char *fmt, ...)
{
    va_list vlist;
    va_start(vlist, fmt);

    int nextPosition=(m_tail+1)%MAX_BUFFER_LINE;
    if(nextPosition==m_head){
        // ヘッドとビューの移動
        if(m_head==m_currentView){
            m_currentView=(m_head+1)%MAX_BUFFER_LINE;
        }
        m_head=(m_head+1)%MAX_BUFFER_LINE;

    }
    strlcpy(s_buffers[m_tail], GetFormattedString(fmt, vlist), MAX_BUFFER_CHARS);
    m_tail=nextPosition;
    NN_LOG("cup: %s\n", GetFormattedString(fmt, vlist));

    // ビューの移動
    if((m_currentView+MAX_DISPLAY_LINES)%MAX_BUFFER_LINE==m_tail){
        m_currentView=(m_currentView+1)%MAX_BUFFER_LINE;
    }

    return this;
}
ScrollBuffer *ScrollBuffer::ReplaceText(const char *fmt, ...)
{
    va_list vlist;
    va_start(vlist, fmt);

    NN_ASSERT(m_tail!=m_head);
    strlcpy(s_buffers[(m_tail-1)%MAX_BUFFER_LINE], GetFormattedString(fmt, vlist), MAX_BUFFER_CHARS);

    return this;
}

void ScrollBuffer::Render()
{
    // 描画前処理
    m_render->SetRenderTarget(NN_GX_DISPLAY1);
    m_render->Clear();

    // リングバッファなので、終端条件を調整
    int tail=(m_tail<m_head) ? m_tail+ScrollBuffer::MAX_BUFFER_LINE : m_tail;

    for(int i=m_currentView; i<tail; i++){
        if(i<m_currentView+MAX_DISPLAY_LINES-1){
            m_render->DrawText(0, (i-m_currentView)*FONT_SIZE, s_buffers[i%MAX_BUFFER_LINE]);
        }
    }

    // 描画転送
    m_render->SwapBuffers();
}