/*************************************************************************/
/*  output_strings.cpp                                                   */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                    http://www.godotengine.org                         */
/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur.                 */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
/*                                                                       */
/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
/*************************************************************************/
#include "output_strings.h"



void OutputStrings::update_scrollbars() {

	Size2 hmin = h_scroll->get_combined_minimum_size();
	Size2 vmin = v_scroll->get_combined_minimum_size();

	v_scroll->set_anchor( MARGIN_LEFT, ANCHOR_END );
	v_scroll->set_anchor( MARGIN_RIGHT, ANCHOR_END );
	v_scroll->set_anchor( MARGIN_BOTTOM, ANCHOR_END );

	v_scroll->set_begin( Point2(vmin.width, 0) );
	v_scroll->set_end( Point2(0,0 ) );

	h_scroll->set_anchor( MARGIN_RIGHT, ANCHOR_END );
	h_scroll->set_anchor( MARGIN_TOP, ANCHOR_END );
	h_scroll->set_anchor( MARGIN_BOTTOM, ANCHOR_END );

	h_scroll->set_begin( Point2( 0, hmin.y) );
	h_scroll->set_end( Point2(vmin.x,  0) );

	margin.y=hmin.y;
	margin.x=vmin.x;

	Ref<StyleBox> tree_st = get_stylebox("bg","Tree");
	int page = ((size_height-(int)margin.y-tree_st->get_margin(MARGIN_TOP)) / font_height);
	v_scroll->set_page(page);

}

void OutputStrings::_notification(int p_what) {

	switch(p_what) {


		case NOTIFICATION_DRAW: {

			if (following) {

				updating=true;
				v_scroll->set_val( v_scroll->get_max() - v_scroll->get_page() );
				updating=false;
			}

			RID ci = get_canvas_item();
			Size2 size = get_size();

			Ref<Font> font = get_font("font","Tree");
			Ref<StyleBox> tree_st = get_stylebox("bg","Tree");
			tree_st->draw(ci,Rect2(Point2(),size));
			Color color = get_color("font_color","Tree");
			Ref<Texture> icon_error = get_icon("Error","EditorIcons");
			Ref<Texture> icon_warning = get_icon("Warning","EditorIcons");

		//	int lines = (size_height-(int)margin.y) / font_height;
			Point2 ofs=tree_st->get_offset();

			LineMap::Element *E = line_map.find(v_scroll->get_val());
			float h_ofs = (int)h_scroll->get_val();
			Point2 icon_ofs=Point2(0,(font_height-(int)icon_error->get_height())/2);

			while( E && ofs.y < (size_height-(int)margin.y) ) {

				String str = E->get().text;
				Point2 line_ofs=ofs;

				switch(E->get().type) {

					case LINE_WARNING: {
						icon_warning->draw(ci,line_ofs+icon_ofs);

					} break;
					case LINE_ERROR: {
						icon_error->draw(ci,line_ofs+icon_ofs);
					} break;
					case LINE_LINK: {

					} break;
					default: {}
				}

				line_ofs.y+=font->get_ascent();
				line_ofs.x+=icon_error->get_width()+4;

				for(int i=0;i<str.length();i++) {
					if (line_ofs.x-h_ofs < 0 ) {
						line_ofs.x+=font->get_char_size(str[i],str[i+1]).width;
					} else if (line_ofs.x-h_ofs > size.width - margin.width) {
						break;
					} else {
						line_ofs.x+=font->draw_char(ci,Point2(line_ofs.x-h_ofs,line_ofs.y),str[i],str[i+1],color);
					}
				}

				ofs.y+=font_height;
				E=E->next();
			}

		} break;

		case NOTIFICATION_ENTER_TREE:
		case NOTIFICATION_RESIZED: {


			font_height = get_font("font","Tree")->get_height();
			size_height = get_size().height;
			update_scrollbars();
		} break;
	}

}

void OutputStrings::_hscroll_changed(float p_value) {

	if (updating)
		return;

	update();
}
void OutputStrings::_vscroll_changed(float p_value) {

	if (updating)
		return;
	//user changed scroll
	following=(p_value+v_scroll->get_page())>=v_scroll->get_max();
	update();
}

void OutputStrings::add_line(const String& p_text, const Variant& p_meta, const LineType p_type) {


	Vector<String> strings=p_text.split("\n");

	for(int i=0;i<strings.size();i++) {

		if (strings[i].length()==0)
			continue;

		int last = line_map.empty() ? 0 : (line_map.back()->key() + 1);

		Line l;
		l.text=strings[i];
		l.meta=p_meta;
		l.type=p_type;
		line_map.insert(last,l);

		updating=true;
		v_scroll->set_max(last+1);
		v_scroll->set_min(line_map.front()->key());
		updating=false;

	}

	while (line_map.size() > line_max_count) {

		line_map.erase(line_map.front());
	}


	update();

}


void OutputStrings::_bind_methods() {

	ClassDB::bind_method("_vscroll_changed",&OutputStrings::_vscroll_changed);
	ClassDB::bind_method("_hscroll_changed",&OutputStrings::_hscroll_changed);
}

OutputStrings::OutputStrings() {

	following=true;
	updating=false;
	line_max_count=4096;
	h_scroll = memnew( HScrollBar );
	v_scroll = memnew( VScrollBar );
	add_child(h_scroll);
	add_child(v_scroll);
	size_height=1;
	font_height=1;
	update_scrollbars();
	h_scroll->connect("value_changed", this,"_hscroll_changed");
	v_scroll->connect("value_changed", this,"_vscroll_changed");
}