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#include "TWB\colors.h"

#include "TWB\anchors.h"

#include "TWB\parse_tag.h"

#include "TWB\special.h"

#include "TWB\tag_list.h"

#define DEFAULT_BG_COL 0xffEBE8E9;

dword link_color_default;

dword link_color_active;

#include "TWB\links.h"

#define BODY_MARGIN 6

#define BASIC_CHAR_W 8

#define BASIC_LINE_H 18

struct STYLE {

	bool

	b, u, s, h,

	font,

	pre,

	blq,

	button,

	image;

	LIST tag_list;

	dword title;

	dword cur_line_h;

	void reset();

};

void STYLE::reset()

{

	b = u = s = h = blq = pre = title = false;

	font = false;

	cur_line_h = NULL;

	tag_list.reset();

}

struct TWebBrowser {

	llist list;

	STYLE style;

	dword draw_y, draw_x, draw_w, left_gap;

	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 linebuf[500];

	char redirect[URL_SIZE];

	void SetStyle();

	void RenderTextbuf();

	void RenderLine();

	bool RenderImage();

	void SetPageDefaults();

	void ParseHtml();

	void NewLine();

	void ChangeEncoding();

	void AddCharToTheLine();

	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();

	void tag_table_reset();

	void tag_table();

	void tag_td();

	void tag_tr();

};

#include "TWB\render.h"

#include "TWB\set_style.h"

//============================================================================================

void TWebBrowser::SetPageDefaults()

{

	t_html = t_body = link = false;

	style.reset();

	link_color_default = 0x0000FF;

	link_color_active = 0xFF0000;

	style.cur_line_h = list.item_h;

	links.clear();

	anchors.clear();

	img_url.drop();

	text_colors.drop();

	text_colors.add(0);

	bg_colors.drop();

	bg_colors.add(DEFAULT_BG_COL);

	canvas.Fill(0, DEFAULT_BG_COL);

	header = NULL;

	draw_y = BODY_MARGIN;

	draw_x = left_gap = BODY_MARGIN;

	draw_w = list.w - BODY_MARGIN;

	linebuf = 0;

	redirect = '\0';

	list.SetFont(8, 14, 10011000b);

	tag_table_reset();

}

//============================================================================================

void TWebBrowser::ParseHtml(dword _bufpointer, _bufsize){

	int tab_len;

	dword bufpos;

	bufsize = _bufsize;

	if (list.w!=canvas.bufw) canvas.Init(list.x, list.y, list.w, 400*20);

	if (bufpointer == _bufpointer) {

		custom_encoding = cur_encoding;

	} else {

		bufpointer = malloc(bufsize);

		memmov(bufpointer, _bufpointer, bufsize);

		//hold original buffer

		o_bufpointer = malloc(bufsize);

		memmov(o_bufpointer, bufpointer, bufsize);

		cur_encoding = CH_CP866;

		if (custom_encoding != -1) {

			cur_encoding = custom_encoding;

			bufpointer = ChangeCharset(cur_encoding, "CP866", bufpointer);

			bufsize = strlen(bufpointer);

		}

	}

	SetPageDefaults();

	is_html = true;

	if (!strstri(bufpointer, "

		t_body = true;

		if (!strstri(bufpointer, "

			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) {

				RenderTextbuf();

				NewLine();

			} else {

				goto _DEFAULT;

			}

			break;

		case 0x09:

			if (style.pre) {

				tab_len = draw_x - left_gap / list.font_w + strlen(#linebuf) % 4;

				if (!tab_len) tab_len = 4; else tab_len = 4 - tab_len;

				while (tab_len) {chrcat(#linebuf,' '); tab_len--;}

			} else {

				goto _DEFAULT;

			}

			break;

		case '&': //  and so on

			bufpos = GetUnicodeSymbol(#linebuf, sizeof(TWebBrowser.linebuf), bufpos+1, bufpointer+bufsize);

			break;

		case '<':

			if (!is_html) goto _DEFAULT;

			if (!strchr("!/?abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ", ESBYTE[bufpos+1])) goto _DEFAULT;

			bufpos++;

			if (tag.parse(#bufpos, bufpointer + bufsize)) {

				RenderTextbuf();

				$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, strlen(bufpointer));

					return;

				}

			}

			break;

		default:

			_DEFAULT:

			AddCharToTheLine(ESBYTE[bufpos]);

		}

	}

	RenderTextbuf();

	list.count = draw_y + style.cur_line_h;

	canvas.bufh = math.max(list.visible, list.count);

	buf_data = realloc(buf_data, canvas.bufh * canvas.bufw * 4 + 8);

	list.CheckDoesValuesOkey();

	anchors.current = NULL;

	if (!header) {

		strncpy(#header, #version, sizeof(TWebBrowser.header)-1);

		DrawTitle(#header);

	}

}

//============================================================================================

void TWebBrowser::AddCharToTheLine(unsigned char _char)

{

	dword line_len = strlen(#linebuf);

	if (_char<=15) _char=' ';

	if (!style.pre) && (_char == ' ')

	{

		if (linebuf[line_len-1]==' ') return; //no double spaces

		if (draw_x==left_gap) && (!linebuf) return; //no paces at the beginning of the line

		if (link) && (line_len==0) return;

	}

	if (line_len < sizeof(TWebBrowser.linebuf)) chrcat(#linebuf+line_len, _char);

	if (line_len+1 * list.font_w + draw_x >= draw_w) RenderTextbuf();

}

//============================================================================================

void TWebBrowser::NewLine()

{

	static bool empty_line = true;

	if (draw_x==left_gap) && (draw_y==BODY_MARGIN) return;

	if (t_html) && (!t_body) return;

	if (draw_x == style.tag_list.level * 5 * list.font_w + left_gap) {

		if (!empty_line) empty_line=true; else return;

	} else {

		empty_line = false;

	}

	draw_y += style.cur_line_h;

	style.cur_line_h = list.item_h;

	if (style.blq) draw_x = 6 * list.font_w; else draw_x = 0;

	draw_x += style.tag_list.level * 5 * list.font_w + left_gap;

}

//============================================================================================

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);

	}

}

//============================================================================================

scroll_bar scroll_wv = { 15,NULL,NULL,NULL,

  0,2,NULL,0,0,0xeeeeee,0xBBBbbb,0xeeeeee};

void TWebBrowser::DrawPage()

{

	if (list.w!=canvas.bufw) {

		ParseHtml(bufpointer, bufsize);

	}

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

	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;

	if (list.count <= list.visible) {

		DrawBar(scroll_wv.start_x, scroll_wv.start_y, scroll_wv.size_x,

		scroll_wv.size_y, bg_colors.get(0) & 0x00FFFFFF);

	} else {

		scrollbar_v_draw(#scroll_wv);

	}

}