/*
 * Copyright (c) 2006 Josef Cejka
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup console
 * @{
 */
/** @file
 */

#include <io/style.h>
#include <malloc.h>
#include <unistd.h>
#include "screenbuffer.h"

/** Store one character to screenbuffer.
 *
 * Its position is determined by scr->position_x
 * and scr->position_y.
 *
 * @param scr Screenbuffer
 * @param c   Stored character
 *
 */
void screenbuffer_putchar(screenbuffer_t *scr, wchar_t ch)
{
	keyfield_t *field =
	    get_field_at(scr, scr->position_x, scr->position_y);
	
	field->character = ch;
	field->attrs = scr->attrs;
}

/** Initilize screenbuffer.
 *
 * Allocate space for screen content in accordance to given size.
 *
 * @param scr    Initialized screenbuffer
 * @param size_x Width in characters
 * @param size_y Height in characters
 *
 * @return Pointer to screenbuffer (same as scr parameter) or NULL
 *
 */
screenbuffer_t *screenbuffer_init(screenbuffer_t *scr, size_t size_x, size_t size_y)
{
	scr->buffer = (keyfield_t *) malloc(sizeof(keyfield_t) * size_x * size_y);
	if (!scr->buffer)
		return NULL;
	
	scr->size_x = size_x;
	scr->size_y = size_y;
	scr->attrs.t = at_style;
	scr->attrs.a.s.style = STYLE_NORMAL;
	scr->is_cursor_visible = 1;
	
	screenbuffer_clear(scr);
	
	return scr;
}

/** Clear screenbuffer.
 *
 * @param scr Screenbuffer
 *
 */
void screenbuffer_clear(screenbuffer_t *scr)
{
	size_t i;
	
	for (i = 0; i < (scr->size_x * scr->size_y); i++) {
		scr->buffer[i].character = ' ';
		scr->buffer[i].attrs = scr->attrs;
	}
	
	scr->top_line = 0;
	scr->position_x = 0;
	scr->position_y = 0;
}

/** Clear one buffer line.
 *
 * @param scr
 * @param line One buffer line (not a screen line!)
 *
 */
void screenbuffer_clear_line(screenbuffer_t *scr, size_t line)
{
	size_t x;
	
	for (x = 0; x < scr->size_x; x++) {
		scr->buffer[x + line * scr->size_x].character = ' ';
		scr->buffer[x + line * scr->size_x].attrs = scr->attrs;
	}
}

/** Copy content buffer from screenbuffer to given memory.
 *
 * @param scr  Source screenbuffer
 * @param dest Destination
 *
 */
void screenbuffer_copy_buffer(screenbuffer_t *scr, keyfield_t *dest)
{
	size_t i;
	
	for (i = 0; i < (scr->size_x * scr->size_y); i++)
		dest[i] = scr->buffer[i];
}

/** Set new cursor position in screenbuffer.
 *
 * @param scr
 * @param x
 * @param y
 *
 */
void screenbuffer_goto(screenbuffer_t *scr, size_t x, size_t y)
{
	scr->position_x = x % scr->size_x;
	scr->position_y = y % scr->size_y;
}

/** Set new style.
 *
 * @param scr
 * @param fg_color
 * @param bg_color
 *
 */
void screenbuffer_set_style(screenbuffer_t *scr, uint8_t style)
{
	scr->attrs.t = at_style;
	scr->attrs.a.s.style = style;
}

/** Set new color.
 *
 * @param scr
 * @param fg_color
 * @param bg_color
 *
 */
void screenbuffer_set_color(screenbuffer_t *scr, uint8_t fg_color, uint8_t bg_color, uint8_t flags)
{
	scr->attrs.t = at_idx;
	scr->attrs.a.i.fg_color = fg_color;
	scr->attrs.a.i.bg_color = bg_color;
	scr->attrs.a.i.flags = flags;
}

/** Set new RGB color.
 *
 * @param scr
 * @param fg_color
 * @param bg_color
 *
 */
void screenbuffer_set_rgb_color(screenbuffer_t *scr, uint32_t fg_color, uint32_t bg_color)
{
	scr->attrs.t = at_rgb;
	scr->attrs.a.r.fg_color = fg_color;
	scr->attrs.a.r.bg_color = bg_color;
}

/** @}
 */