/*************************************************************************/
/*  button.cpp                                                           */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
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/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
/*                                                                       */
/* 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  */
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/*************************************************************************/

#include "button.h"

#include "core/translation.h"
#include "servers/rendering_server.h"

Size2 Button::get_minimum_size() const {
	Size2 minsize = get_theme_font("font")->get_string_size(xl_text);
	if (clip_text)
		minsize.width = 0;

	if (!expand_icon) {
		Ref<Texture2D> _icon;
		if (icon.is_null() && has_theme_icon("icon"))
			_icon = Control::get_theme_icon("icon");
		else
			_icon = icon;

		if (!_icon.is_null()) {
			minsize.height = MAX(minsize.height, _icon->get_height());
			minsize.width += _icon->get_width();
			if (xl_text != "")
				minsize.width += get_theme_constant("hseparation");
		}
	}

	return get_theme_stylebox("normal")->get_minimum_size() + minsize;
}

void Button::_set_internal_margin(Margin p_margin, float p_value) {
	_internal_margin[p_margin] = p_value;
}

void Button::_notification(int p_what) {
	switch (p_what) {
		case NOTIFICATION_TRANSLATION_CHANGED: {
			xl_text = tr(text);
			minimum_size_changed();
			update();
		} break;
		case NOTIFICATION_DRAW: {
			RID ci = get_canvas_item();
			Size2 size = get_size();
			Color color;
			Color color_icon(1, 1, 1, 1);

			Ref<StyleBox> style = get_theme_stylebox("normal");

			switch (get_draw_mode()) {
				case DRAW_NORMAL: {
					style = get_theme_stylebox("normal");
					if (!flat)
						style->draw(ci, Rect2(Point2(0, 0), size));
					color = get_theme_color("font_color");
					if (has_theme_color("icon_color_normal"))
						color_icon = get_theme_color("icon_color_normal");
				} break;
				case DRAW_HOVER_PRESSED: {
					if (has_theme_stylebox("hover_pressed") && has_theme_stylebox_override("hover_pressed")) {
						style = get_theme_stylebox("hover_pressed");
						if (!flat)
							style->draw(ci, Rect2(Point2(0, 0), size));
						if (has_theme_color("font_color_hover_pressed"))
							color = get_theme_color("font_color_hover_pressed");
						else
							color = get_theme_color("font_color");
						if (has_theme_color("icon_color_hover_pressed"))
							color_icon = get_theme_color("icon_color_hover_pressed");

						break;
					}
					[[fallthrough]];
				}
				case DRAW_PRESSED: {
					style = get_theme_stylebox("pressed");
					if (!flat)
						style->draw(ci, Rect2(Point2(0, 0), size));
					if (has_theme_color("font_color_pressed"))
						color = get_theme_color("font_color_pressed");
					else
						color = get_theme_color("font_color");
					if (has_theme_color("icon_color_pressed"))
						color_icon = get_theme_color("icon_color_pressed");

				} break;
				case DRAW_HOVER: {
					style = get_theme_stylebox("hover");
					if (!flat)
						style->draw(ci, Rect2(Point2(0, 0), size));
					color = get_theme_color("font_color_hover");
					if (has_theme_color("icon_color_hover"))
						color_icon = get_theme_color("icon_color_hover");

				} break;
				case DRAW_DISABLED: {
					style = get_theme_stylebox("disabled");
					if (!flat)
						style->draw(ci, Rect2(Point2(0, 0), size));
					color = get_theme_color("font_color_disabled");
					if (has_theme_color("icon_color_disabled"))
						color_icon = get_theme_color("icon_color_disabled");

				} break;
			}

			if (has_focus()) {
				Ref<StyleBox> style2 = get_theme_stylebox("focus");
				style2->draw(ci, Rect2(Point2(), size));
			}

			Ref<Font> font = get_theme_font("font");
			Ref<Texture2D> _icon;
			if (icon.is_null() && has_theme_icon("icon"))
				_icon = Control::get_theme_icon("icon");
			else
				_icon = icon;

			Rect2 icon_region = Rect2();
			if (!_icon.is_null()) {
				int valign = size.height - style->get_minimum_size().y;
				if (is_disabled()) {
					color_icon.a = 0.4;
				}

				float icon_ofs_region = 0;
				if (_internal_margin[MARGIN_LEFT] > 0) {
					icon_ofs_region = _internal_margin[MARGIN_LEFT] + get_theme_constant("hseparation");
				}

				if (expand_icon) {
					Size2 _size = get_size() - style->get_offset() * 2;
					_size.width -= get_theme_constant("hseparation") + icon_ofs_region;
					if (!clip_text)
						_size.width -= get_theme_font("font")->get_string_size(xl_text).width;
					float icon_width = _icon->get_width() * _size.height / _icon->get_height();
					float icon_height = _size.height;

					if (icon_width > _size.width) {
						icon_width = _size.width;
						icon_height = _icon->get_height() * icon_width / _icon->get_width();
					}

					icon_region = Rect2(style->get_offset() + Point2(icon_ofs_region, (_size.height - icon_height) / 2), Size2(icon_width, icon_height));
				} else {
					icon_region = Rect2(style->get_offset() + Point2(icon_ofs_region, Math::floor((valign - _icon->get_height()) / 2.0)), _icon->get_size());
				}
			}

			Point2 icon_ofs = !_icon.is_null() ? Point2(icon_region.size.width + get_theme_constant("hseparation"), 0) : Point2();
			int text_clip = size.width - style->get_minimum_size().width - icon_ofs.width;
			if (_internal_margin[MARGIN_LEFT] > 0) {
				text_clip -= _internal_margin[MARGIN_LEFT] + get_theme_constant("hseparation");
			}
			if (_internal_margin[MARGIN_RIGHT] > 0) {
				text_clip -= _internal_margin[MARGIN_RIGHT] + get_theme_constant("hseparation");
			}

			Point2 text_ofs = (size - style->get_minimum_size() - icon_ofs - font->get_string_size(xl_text) - Point2(_internal_margin[MARGIN_RIGHT] - _internal_margin[MARGIN_LEFT], 0)) / 2.0;

			switch (align) {
				case ALIGN_LEFT: {
					if (_internal_margin[MARGIN_LEFT] > 0) {
						text_ofs.x = style->get_margin(MARGIN_LEFT) + icon_ofs.x + _internal_margin[MARGIN_LEFT] + get_theme_constant("hseparation");
					} else {
						text_ofs.x = style->get_margin(MARGIN_LEFT) + icon_ofs.x;
					}
					text_ofs.y += style->get_offset().y;
				} break;
				case ALIGN_CENTER: {
					if (text_ofs.x < 0)
						text_ofs.x = 0;
					text_ofs += icon_ofs;
					text_ofs += style->get_offset();
				} break;
				case ALIGN_RIGHT: {
					if (_internal_margin[MARGIN_RIGHT] > 0) {
						text_ofs.x = size.x - style->get_margin(MARGIN_RIGHT) - font->get_string_size(xl_text).x - _internal_margin[MARGIN_RIGHT] - get_theme_constant("hseparation");
					} else {
						text_ofs.x = size.x - style->get_margin(MARGIN_RIGHT) - font->get_string_size(xl_text).x;
					}
					text_ofs.y += style->get_offset().y;
				} break;
			}

			text_ofs.y += font->get_ascent();
			font->draw(ci, text_ofs.floor(), xl_text, color, clip_text ? text_clip : -1);

			if (!_icon.is_null() && icon_region.size.width > 0) {
				draw_texture_rect_region(_icon, icon_region, Rect2(Point2(), _icon->get_size()), color_icon);
			}
		} break;
	}
}

void Button::set_text(const String &p_text) {
	if (text == p_text)
		return;
	text = p_text;
	xl_text = tr(p_text);
	update();
	_change_notify("text");
	minimum_size_changed();
}

String Button::get_text() const {
	return text;
}

void Button::set_icon(const Ref<Texture2D> &p_icon) {
	if (icon == p_icon)
		return;
	icon = p_icon;
	update();
	_change_notify("icon");
	minimum_size_changed();
}

Ref<Texture2D> Button::get_icon() const {
	return icon;
}

void Button::set_expand_icon(bool p_expand_icon) {
	expand_icon = p_expand_icon;
	update();
	minimum_size_changed();
}

bool Button::is_expand_icon() const {
	return expand_icon;
}

void Button::set_flat(bool p_flat) {
	flat = p_flat;
	update();
	_change_notify("flat");
}

bool Button::is_flat() const {
	return flat;
}

void Button::set_clip_text(bool p_clip_text) {
	clip_text = p_clip_text;
	update();
	minimum_size_changed();
}

bool Button::get_clip_text() const {
	return clip_text;
}

void Button::set_text_align(TextAlign p_align) {
	align = p_align;
	update();
}

Button::TextAlign Button::get_text_align() const {
	return align;
}

void Button::_bind_methods() {
	ClassDB::bind_method(D_METHOD("set_text", "text"), &Button::set_text);
	ClassDB::bind_method(D_METHOD("get_text"), &Button::get_text);
	ClassDB::bind_method(D_METHOD("set_button_icon", "texture"), &Button::set_icon);
	ClassDB::bind_method(D_METHOD("get_button_icon"), &Button::get_icon);
	ClassDB::bind_method(D_METHOD("set_expand_icon"), &Button::set_expand_icon);
	ClassDB::bind_method(D_METHOD("is_expand_icon"), &Button::is_expand_icon);
	ClassDB::bind_method(D_METHOD("set_flat", "enabled"), &Button::set_flat);
	ClassDB::bind_method(D_METHOD("set_clip_text", "enabled"), &Button::set_clip_text);
	ClassDB::bind_method(D_METHOD("get_clip_text"), &Button::get_clip_text);
	ClassDB::bind_method(D_METHOD("set_text_align", "align"), &Button::set_text_align);
	ClassDB::bind_method(D_METHOD("get_text_align"), &Button::get_text_align);
	ClassDB::bind_method(D_METHOD("is_flat"), &Button::is_flat);

	BIND_ENUM_CONSTANT(ALIGN_LEFT);
	BIND_ENUM_CONSTANT(ALIGN_CENTER);
	BIND_ENUM_CONSTANT(ALIGN_RIGHT);

	ADD_PROPERTY(PropertyInfo(Variant::STRING, "text", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_DEFAULT_INTL), "set_text", "get_text");
	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "icon", PROPERTY_HINT_RESOURCE_TYPE, "Texture2D"), "set_button_icon", "get_button_icon");
	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "flat"), "set_flat", "is_flat");
	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "clip_text"), "set_clip_text", "get_clip_text");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "align", PROPERTY_HINT_ENUM, "Left,Center,Right"), "set_text_align", "get_text_align");
	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "expand_icon"), "set_expand_icon", "is_expand_icon");
}

Button::Button(const String &p_text) {
	flat = false;
	clip_text = false;
	expand_icon = false;
	set_mouse_filter(MOUSE_FILTER_STOP);
	set_text(p_text);
	align = ALIGN_CENTER;

	for (int i = 0; i < 4; i++) {
		_internal_margin[i] = 0;
	}
}

Button::~Button() {
}