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// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/*********************************************************************

    dvtext.cpp

    Debugger simple text-based views.

***************************************************************************/

#include "emu.h"
#include "debugvw.h"
#include "dvtext.h"
#include "debugcon.h"
#include "debugger.h"

//**************************************************************************
//  DEBUG VIEW TEXTBUF
//**************************************************************************

//-------------------------------------------------
//  debug_view_textbuf - constructor
//-------------------------------------------------

debug_view_textbuf::debug_view_textbuf(running_machine &machine, debug_view_type type, debug_view_osd_update_func osdupdate, void *osdprivate, text_buffer &textbuf)
	: debug_view(machine, type, osdupdate, osdprivate),
		m_textbuf(textbuf),
		m_at_bottom(true),
		m_topseq(0)
{
}


//-------------------------------------------------
//  ~debug_view_textbuf - destructor
//-------------------------------------------------

debug_view_textbuf::~debug_view_textbuf()
{
}


//-------------------------------------------------
//  clear - clear the contents
//-------------------------------------------------

void debug_view_textbuf::clear()
{
	begin_update();
	text_buffer_clear(&m_textbuf);
	m_at_bottom = true;
	m_topseq = 0;
	end_update();
}


//-------------------------------------------------
//  view_update - update a text buffer-based view
//-------------------------------------------------

void debug_view_textbuf::view_update()
{
	// update the console info
	m_total.x = text_buffer_max_width(&m_textbuf);
	m_total.y = text_buffer_num_lines(&m_textbuf);
	if (m_total.x < 80)
		m_total.x = 80;

	// determine the starting sequence number
	u32 curseq = 0;
	if (!m_at_bottom)
	{
		curseq = m_topseq;
		if (!text_buffer_get_seqnum_line(&m_textbuf, curseq))
			m_at_bottom = true;
	}
	if (m_at_bottom)
	{
		curseq = text_buffer_line_index_to_seqnum(&m_textbuf, m_total.y - 1);
		if (m_total.y < m_visible.y)
			curseq -= m_total.y - 1;
		else
			curseq -= m_visible.y - 1;
	}
	m_topleft.y = curseq - text_buffer_line_index_to_seqnum(&m_textbuf, 0);

	// loop over visible rows
	debug_view_char *dest = &m_viewdata[0];
	for (u32 row = 0; row < m_visible.y; row++)
	{
		const char *line = text_buffer_get_seqnum_line(&m_textbuf, curseq++);
		u32 col = 0;

		// if this visible row is valid, add it to the buffer
		if (line != nullptr)
		{
			size_t len = strlen(line);
			u32 effcol = m_topleft.x;

			// copy data
			while (col < m_visible.x && effcol < len)
			{
				dest->byte = line[effcol++];
				dest->attrib = DCA_NORMAL;
				dest++;
				col++;
			}
		}

		// fill the rest with blanks
		while (col < m_visible.x)
		{
			dest->byte = ' ';
			dest->attrib = DCA_NORMAL;
			dest++;
			col++;
		}
	}
}


//-------------------------------------------------
//  view_notify - handle notification of updates
//  to visible area
//-------------------------------------------------

void debug_view_textbuf::view_notify(debug_view_notification type)
{
	if (type == VIEW_NOTIFY_VISIBLE_CHANGED)
	{
		// if the bottom line is visible, just track the bottom
		m_at_bottom = (m_total.y >= m_topleft.y && m_total.y <= m_topleft.y + m_visible.y);

		/* otherwise, track the seqence number of the top line */
		if (!m_at_bottom)
			m_topseq = text_buffer_line_index_to_seqnum(&m_textbuf, m_topleft.y);
	}
}



//**************************************************************************
//  DEBUG VIEW CONSOLE
//**************************************************************************

//-------------------------------------------------
//  debug_view_console - constructor
//-------------------------------------------------

debug_view_console::debug_view_console(running_machine &machine, debug_view_osd_update_func osdupdate, void *osdprivate)
	: debug_view_textbuf(machine, DVT_CONSOLE, osdupdate, osdprivate, *machine.debugger().console().get_console_textbuf())
{
}



//**************************************************************************
//  DEBUG VIEW LOG
//**************************************************************************

//-------------------------------------------------
//  debug_view_log - constructor
//-------------------------------------------------

debug_view_log::debug_view_log(running_machine &machine, debug_view_osd_update_func osdupdate, void *osdprivate)
	: debug_view_textbuf(machine, DVT_LOG, osdupdate, osdprivate, *machine.debugger().console().get_errorlog_textbuf())
{
}