;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;                                                                 ;;
;; Copyright (C) KolibriOS team 2004-2014. All rights reserved.    ;;
;; Distributed under terms of the GNU General Public License       ;;
;;                                                                 ;;
;;   Written by hidnplayr@kolibrios.org                            ;;
;;                                                                 ;;
;;         GNU GENERAL PUBLIC LICENSE                              ;;
;;          Version 2, June 1991                                   ;;
;;                                                                 ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;


text_insert_newlines:			; esi = ASCIIZ string

	xor	edx, edx		; number of lines of text
	cmp	byte[esi], 0
	je	.done
  .next_line:
	xor	ebx, ebx
	mov	ecx, [textbox_width]
	inc	ecx
  .more:
	dec	ecx
	jz	.end_of_line
	lodsb				; get one character of the string
	test	al, al			; end of string?
	jz	.almost_done
	cmp	al, ' ' 		; it's a space! remember its position
	je	.space
	cmp	al, 13			; we already inserted a newline once, make it a space again
	je	.soft_nl
	cmp	al, 10			; it's a newline, continue onto the next line
	jne	.more
	inc	edx
	jmp	.next_line
  .soft_nl:
	mov	byte[esi-1], ' '
  .space:
	mov	ebx, esi		; last detected space
	jmp	.more
  .end_of_line:
	inc	edx
	test	ebx, ebx		; did we detect any spaces on this line?
	jz	.next_line		; no:   just continue onto the next line
	mov	byte[ebx-1], 13 	; yes:  replace last space on line with a soft newline
	mov	esi, ebx		;       and continue parsing just after last space
	jmp	.next_line		;
  .almost_done:
	dec	esi
  .done:

	ret

;----------------------------------
; scan untill next line is reached
;
; When you set the direction flag before calling, you can also scan for previous line!
; IN:   esi
; OUT:  esi
;----------------------------------
text_nextline:

	mov	ecx, [textbox_width]
  .loop:
	lodsb
	test	al, al
	jz	.done
	cmp	al, 10
	je	.done
	cmp	al, 13
	je	.done
	dec	ecx
	jnz	.loop
  .done:

	ret


;----------------------------------
; print string
;
; IN:   esi = ptr to string
;       bl = char which marks end of string
; OUT:  esi = ptr to end of str
;----------------------------------
print_string:

	push	eax
  .loop:
	lodsb
	cmp	al, bl
	je	.done
	cmp	al, 13
	je	.loop
	test	al, al
	jz	.done
	call	print_char
	jmp	.loop
  .done:
	pop	eax

	ret


;----------------------------------
; print ASCIIZ string
;
; IN:   esi = ptr to ASCIIZ string
; OUT:  esi = ptr to end of str
;----------------------------------
print_asciiz:

	push	eax
  .loop:
	lodsb
	test	al, al
	jz	.done
	call	print_char
	jmp	.loop
  .done:
	pop	eax

	ret


;----------------------------------
; print character
;
; IN:   al = char to print
; OUT:  /
;----------------------------------
print_char:

	push	esi edi
	mov	esi, [window_print]
	mov	edi, [esi + window.text_write]
	stosb
	cmp	edi, [esi + window.text_end]
	jae	.uh_ow
	mov	[esi + window.text_write], edi
  .continue:
	or	[esi + window.flags], FLAG_UPDATED
	pop	edi esi

	ret

  .uh_ow:
	pusha
	mov	edi, [esi + window.text_start]
	mov	[esi + window.text_print], edi
	lea	esi, [edi + TEXT_BUFFERSIZE/2]
	call	text_nextline
	mov	ecx, TEXT_BUFFERSIZE/8
	rep	movsd
	mov	esi, edi
	call	text_insert_newlines

	mov	ebx, [window_print]
	mov	[ebx + window.text_lines], edx
	mov	[ebx + window.text_scanned], esi
	mov	[ebx + window.text_write], esi
	mov	[ebx + window.text_line_print], 0
	popa

	jmp	.continue



draw_channel_text:

	mov	edi, [window_active]
	and	[edi + window.flags], not FLAG_UPDATED	; clear the 'window is updated' flag

; Scan new text for newlines
	mov	esi, [edi + window.text_scanned]
	call	text_insert_newlines
	add	[edi + window.text_lines], edx
	mov	[edi + window.text_scanned], esi

; Is scrollbar at lowest position?
	test	[edi + window.flags], FLAG_SCROLL_LOW
	jnz	.yesscroll				;Yes
	cmp	[scroll2.all_redraw], 1 		;No
	jnz	 .noscroll
	mov	edx, [textbox_height]
	add	edx, [edi + window.text_line_print]
    cmp edx, [edi + window.text_lines]
	jl	.noscroll
  .yesscroll:
; Scrollbar was at lowest position, scroll down automatically when new text arrived.
	mov	edx, [edi + window.text_lines]
	sub	edx, [textbox_height]
	jle	.noscroll				; There are less lines of text than fit into the window, dont scroll..
	sub	edx, [edi + window.text_line_print]
	je	.noscroll				; We are already at the bottom pos, dont scroll..
  .scroll_to_pos:		; edx = number of lines to go up/down (flags must indicate direction)
	pushf
	add	[edi + window.text_line_print], edx
	mov	esi, [edi + window.text_print]
	popf
	ja	.loop_forward
	std			; set direction flag so we can scan backwards
	dec	esi
	dec	esi		; move our cursor just in front of newline, for scanning backwards
  .loop_backward:
	call	text_nextline
	inc	edx
	jnz	.loop_backward
	inc	esi
	inc	esi		; move the cursor just after last newline
	cld
	jmp	.ok

  .loop_forward:
	call	text_nextline
	dec	edx
	jnz	.loop_forward
  .ok:
	mov	[edi + window.text_print], esi
  .noscroll:

; Update and draw scrollbar when nescessary
	mov	edx, [edi + window.text_lines]
	cmp	edx, [textbox_height]
	jbe	.scroll_done

	mov	[scroll2.max_area], edx
	mov	eax, [edi + window.text_line_print]
	mov	[scroll2.position], eax

	push	dword scroll2			; redraw scrollbar
	call	[scrollbar_draw]
	mov	[scroll2.all_redraw], 0 	; next time, dont redraw it completely
  .scroll_done:

; Calculate start offset coordinates (align text to bottom)
	mov	ebx, [textbox_height]
	sub	ebx, [edi + window.text_lines]
	jb	.no_offset
	imul	ebx, FONT_HEIGHT
	push	[edi + window.text_start]
	pop	[edi + window.text_print]
	jmp	.draw_text
  .no_offset:
	xor	ebx, ebx
  .draw_text:
; Prepare to actually draw some text
	mov	eax, [textbox_height]	; max number of lines to draw
	add	ebx, TEXT_X shl 16 + TEXT_Y
	mov	ecx, [colors.work_text] ; default text color
	mov	edx, [edi + window.text_print]
  .drawloop:
	cmp	byte[edx], 0
	je	.end_of_text

; Clear one row of characters
	pusha
	mov	cx, bx
	shl	ecx, 16
	mov	cx, FONT_HEIGHT
	mov	ebx, TEXT_X shl 16
	mov	bx, word[textbox_width]
	imul	bx, FONT_WIDTH
	mov	edx, [colors.work]
	mcall	13			; draw rectangle
	popa

	mov	esi, edx
	add	esi, [textbox_width]
  .line:
	cmp	byte[edx], 0
	je	.end_of_text

	cmp	byte[edx], 13
	je	.newline_soft

	cmp	byte[edx], 10
	je	.newline_hard

	push	esi eax
	cmp	byte[edx], 3		; escape code for mIRC colors
	jne	.no_colors
	inc	edx
	call	dec_to_esi
	jz	.no_colors
	mov	ecx, [irc_colors + 4*esi]

	cmp	byte[edx], ','		; background color?
	jne	.no_colors
	inc	edx
	call	dec_to_esi
	jz	.no_colors
	mov	edi, [irc_colors + 4*esi]
	or	ecx, 0x40000000
  .no_colors:

	mov	esi, 1
	mcall	4			; draw text
	add	ebx, FONT_WIDTH shl 16
	inc	edx
	pop	eax esi
	cmp	edx, esi
	jb	.line
	jmp	.line_full

  .newline_hard:
	mov	ecx, [colors.work_text]
  .newline_soft:
	inc	edx
  .line_full:
	and	ebx, 0x0000ffff
	add	ebx, TEXT_X shl 16 + FONT_HEIGHT
	dec	eax
	jnz	.drawloop
  .end_of_text:

	ret




dec_to_esi:

	xor	esi, esi
  .loop:
	movzx	eax, byte[edx]
	sub	al, '0'
	jb	.done
	cmp	al, 9
	ja	.done
	inc	edx
	lea	esi, [esi*4 + esi]	; esi * 5
	lea	esi, [esi*2 + eax]	; esi * 2 + eax
	jmp	.loop
  .done:
	cmp	esi, 16
	jae	.fail
	ret

  .fail:
	xor	esi, esi
	ret



if TIMESTAMP
print_timestamp:

	pusha
	mcall	3			; get system time
	mov	ebx, eax

	mov	al, '['
	call	print_char
	mov	ecx, TIMESTAMP
  .loop:
	mov	al, bl
	shr	al, 4
	add	al, '0'
	call	print_char

	mov	al, bl
	and	al, 0x0f
	add	al, '0'
	call	print_char

	dec	ecx
	jz	.done

	mov	al, ':'
	call	print_char
	shr	ebx, 8
	jmp	.loop
  .done:
	mov	al, ']'
	call	print_char
	mov	al, ' '
	call	print_char

	popa
	ret
end if