#include "TWB\colors.h"
#include "TWB\anchors.h"
#include "TWB\parse_tag.h"
#include "TWB\special.h"
#include "TWB\tag_list.h"
dword page_bg;
dword link_color_default;
dword link_color_active;
#include "TWB\links.h"

#define BODY_MARGIN 6
#define BASIC_LINE_H 18

CANVAS canvas;
char line[500];

struct STYLE {
	bool
	b, u, s, h,
	font,
	pre,
	blq,
	button,
	image;
	dword bg_color;
	LIST tag_list;
	dword title;
	void reset();
};

void STYLE::reset()
{
	b = u = s = h = blq = pre = title = false;
	font = false;
	tag_list.reset();
}

struct TWebBrowser {
	llist list;
	STYLE style;
	dword draw_y, stolbec;
	int zoom;
	dword o_bufpointer;
	int cur_encoding, custom_encoding;
	bool link, t_html, t_body;
	dword bufpointer;
	dword bufsize;
	dword is_html;
	collection img_url;
	char header[150];
	char redirect[URL_SIZE];

	void Paint();
	void SetPageDefaults();
	void AddCharToTheLine();
	void ParseHtml();
	void SetStyle();
	bool CheckForLineBreak();
	void NewLine();
	void ChangeEncoding();
	void DrawPage();

	void tag_a();
	void tag_p();
	void tag_img();
	void tag_div();
	void tag_h1234_caption();
	void tag_ol_ul_dt();
	void tag_li();
	void tag_q();
	void tag_hr();
	void tag_code();
	void tag_meta_xml();
	void tag_body();
	void tag_iframe();
	void tag_title();
	void tag_font();
};

#include "TWB\set_style.h"

//============================================================================================
void TWebBrowser::Paint()
{
	dword start_x, line_length, stolbec_len;
	dword text_color__;
	
	if (style.title)
	{
		strncpy(#header, #line, sizeof(TWebBrowser.header)-1);
		strncat(#header, " - ", sizeof(TWebBrowser.header)-1);
		strncat(#header, #version, sizeof(TWebBrowser.header)-1);
		line = 0;
		return;
	}
	if (t_html) && (!t_body) {
		line = 0;
		return;
	}
	
	if (line)
	{
		start_x = stolbec * list.font_w + BODY_MARGIN + list.x;
		stolbec_len = strlen(#line) * zoom;
		line_length = stolbec_len * list.font_w;

		if (style.bg_color!=page_bg) {
			canvas.DrawBar(start_x, draw_y, line_length, list.item_h, style.bg_color);
		}

		if (style.image) {
			canvas.DrawBar(start_x, draw_y, line_length, list.item_h-1, 0xF9DBCB);
		}
		if (style.button) {
			canvas.DrawBar(start_x, draw_y, line_length, list.item_h - calc(zoom*2), 0xCCCccc);
			canvas.DrawBar(start_x, draw_y + list.item_h - calc(zoom*2), line_length, zoom, 0x999999);
		}

		text_color__ = text_colors.get_last();
		if (link) && (text_color__ == text_colors.get(0)) text_color__ = link_color_default;

		canvas.WriteText(start_x, draw_y, list.font_type, text_color__, #line, NULL);
		if (style.b) canvas.WriteText(start_x+1, draw_y, list.font_type, text_color__, #line, NULL);
		if (style.s) canvas.DrawBar(start_x, list.item_h / 2 - zoom + draw_y, line_length, zoom, text_color__);
		if (style.u) canvas.DrawBar(start_x, list.item_h - zoom - zoom + draw_y, line_length, zoom, text_color__);
		if (link) {
			if (line[0]==' ') && (line[1]==NULL) {} else {
				canvas.DrawBar(start_x, draw_y + list.item_h - calc(zoom*2)-1, line_length, zoom, link_color_default);
				links.add_text(start_x, draw_y + list.y, line_length, list.item_h - calc(zoom*2)-1, zoom);				
			}
		}
		stolbec += stolbec_len;
		if (debug_mode) debugln(#line);
		line = NULL;
	}
}
//============================================================================================
void TWebBrowser::SetPageDefaults()
{
	t_html = t_body = link = false;
	style.reset();
	link_color_default = 0x0000FF;
	link_color_active = 0xFF0000;
	page_bg = 0xffEBE8E9; //E0E3E3 EBE8E9
	style.bg_color = page_bg;
	canvas.Fill(0, page_bg);
	links.clear();
	anchors.clear();
	img_url.drop();
	text_colors.drop();
	text_colors.add(0);
	header = NULL;
	cur_encoding = CH_CP866;
	draw_y = BODY_MARGIN;
	stolbec = 0;
	line = 0;
	zoom = 1;
	redirect = '\0';
	//hold original buffer
	if (o_bufpointer) o_bufpointer=free(o_bufpointer);
	o_bufpointer = malloc(bufsize);
	memmov(o_bufpointer, bufpointer, bufsize);
	if (custom_encoding != -1) {
		cur_encoding = custom_encoding;
		bufpointer = ChangeCharset(cur_encoding, "CP866", bufpointer);
	}
}
//============================================================================================
void TWebBrowser::AddCharToTheLine(unsigned char _char)
{
	dword line_len;
	if (_char<=15) _char=' ';
	line_len = strlen(#line);
	if (!style.pre) && (_char == ' ')
	{
		if (line[line_len-1]==' ') return; //no double spaces
		if (!stolbec) && (!line) return; //no paces at the beginning of the line
		if (link) && (line_len==0) return;
	}
	if (line_len < sizeof(line)) chrcat(#line, _char);
	CheckForLineBreak();
}
//============================================================================================
void TWebBrowser::ParseHtml(dword _bufpointer, _bufsize){
	char unicode_symbol[10];
	dword j;
	int tab_len;
	dword bufpos;
	bufsize = _bufsize;

	if (bufpointer != _bufpointer) {
		bufpointer = malloc(bufsize);
		memmov(bufpointer, _bufpointer, bufsize);
	} else {
		custom_encoding = CH_CP866;	
	}
	SetPageDefaults();
	is_html = true;
	if (!strstri(bufpointer, "<body")) {
		t_body = true;
		if (!strstri(bufpointer, "<html")) && (!strstr(bufpointer, "<?xml")) && (!strstr(bufpointer, "<xml")) {
			style.pre = true; //show linebreaks for a plaint text
			is_html = false;
		}
	} 
	for (bufpos=bufpointer ; (bufpos < bufpointer+bufsize) && (ESBYTE[bufpos]!=0) ; bufpos++;)
	{
		switch (ESBYTE[bufpos])
		{
		case 0x0a:
			if (style.pre) {
				Paint();
				NewLine();
			} else {
				AddCharToTheLine(0x0a);
			}
			break;
		case 0x09:
			if (style.pre) {
				tab_len = strlen(#line) + stolbec % 4;
				if (!tab_len) tab_len = 4; else tab_len = 4 - tab_len;
				for (j=0; j<tab_len; j++;) chrcat(#line,' ');
			} else {
				AddCharToTheLine(0x09);
			}
			break;
		case '&': //&nbsp; and so on
			for (j=1, unicode_symbol=0; (ESBYTE[bufpos+j]<>';') && (!__isWhite(ESBYTE[bufpos+j])) && (j<8); j++)
			{
				chrcat(#unicode_symbol, ESBYTE[bufpos+j]);
			}
			if (GetUnicodeSymbol(#line, #unicode_symbol, sizeof(line)-1)) {
				bufpos += j;
				CheckForLineBreak();
			} else {
				AddCharToTheLine('&');
			}
			break;
		case '<':
			if (!is_html) goto _DEFAULT;
			bufpos++;
			switch (ESBYTE[bufpos]) {
				case '!': case '/': case '?': 
				case 'a'...'z': case 'A'...'Z':
					goto _TAG;
				default:
					goto _DEFAULT;
			}
			_TAG:
			if (tag.parse(#bufpos, bufpointer + bufsize)) {
				CheckForLineBreak();
				Paint();
				$push cur_encoding
				SetStyle();
				$pop eax
				// The thing is that UTF if longer than other encodings.
				// So if encoding was changed from UTF to DOS than $bufpos position got wrong,
				// and we have to start parse from the very beginning
				if (EAX != cur_encoding) && (cur_encoding == CH_UTF8) {
					ParseHtml(bufpointer, bufsize);
					return;
				}
			}
			break;
		default:
			_DEFAULT:
			AddCharToTheLine(ESBYTE[bufpos]);
		}
	}
	Paint();
	NewLine();
	list.count = draw_y;

	canvas.bufh = math.max(list.visible, draw_y);
	buf_data = realloc(buf_data, canvas.bufh * canvas.bufw * 4 + 8);

	list.CheckDoesValuesOkey();
	anchors.current = NULL;
	custom_encoding = -1;
	if (!header) {
		strncpy(#header, #version, sizeof(TWebBrowser.header)-1);
		DrawTitle(#header);
	}
}
//============================================================================================
bool TWebBrowser::CheckForLineBreak()
{
	int line_break_pos;
	char new_line_text[4096];
	//Do we need a line break?
	if (strlen(#line)*zoom + stolbec < list.column_max) return false;
	//Yes, we do. Lets calculate where...
	line_break_pos = strrchr(#line, ' ');
	//Is a new line fits in the current line?
	if (line_break_pos*zoom + stolbec > list.column_max) {
		line_break_pos = list.column_max/zoom - stolbec;
		while(line_break_pos) && (line[line_break_pos]!=' ') line_break_pos--;
	}
	//Maybe a new line is too big for the whole new line? Then we have to split it
	if (!line_break_pos) && (style.tag_list.level*5 + strlen(#line) * zoom >= list.column_max) {
		line_break_pos = list.column_max/zoom - stolbec;
	}
	strcpy(#new_line_text, #line + line_break_pos);
	line[line_break_pos] = 0x00;		
	
	Paint();

	strcpy(#line, #new_line_text);
	NewLine();
	return true;
}
//============================================================================================
void TWebBrowser::ChangeEncoding(int _new_encoding)
{
	if (cur_encoding == _new_encoding) return;
	cur_encoding = _new_encoding;
	bufpointer = ChangeCharset(cur_encoding, "CP866", bufpointer);
	if (header) {
		ChangeCharset(cur_encoding, "CP866", #header);
		DrawTitle(#header);
	}
}
//============================================================================================
void TWebBrowser::NewLine()
{
	static int empty_line=0;

	if (!stolbec) && (draw_y==BODY_MARGIN) return;
	
	if (style.tag_list.level) && (stolbec == style.tag_list.level * 5) { 
		if (empty_line<1) empty_line++;
		else return;
	} else if (!stolbec) { 
		if (empty_line<1) empty_line++;
		else return;
	} else {
		empty_line=0;
	}

	if (t_html) && (!t_body) return;
	draw_y += list.item_h;
	if (style.blq) stolbec = 6; else stolbec = 0;
	stolbec += style.tag_list.level * 5;
}
//============================================================================================
scroll_bar scroll_wv = 
{ 15,NULL,NULL,NULL,0,2,NULL,
  0,0,0xeeeeee,0xBBBbbb,0xeeeeee};

void TWebBrowser::DrawPage()
{
	scroll_wv.max_area = list.count;
	scroll_wv.cur_area = list.visible;
	scroll_wv.position = list.first;
	scroll_wv.all_redraw = 0;
	scroll_wv.start_x = list.x + list.w;
	scroll_wv.start_y = list.y;
	scroll_wv.size_y = list.h;
	scrollbar_v_draw(#scroll_wv);

	canvas.Show(list.first, list.h);
}