/*************************************************************************/
/*  color_picker.cpp                                                     */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
/*************************************************************************/
/* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2018 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  */
/* 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 "color_picker.h"

#include "os/input.h"
#include "os/keyboard.h"
#include "os/os.h"
#include "scene/gui/separator.h"
#include "scene/main/viewport.h"

void ColorPicker::_notification(int p_what) {

	switch (p_what) {
		case NOTIFICATION_THEME_CHANGED: {

			btn_pick->set_icon(get_icon("screen_picker", "ColorPicker"));
			bt_add_preset->set_icon(get_icon("add_preset"));

			_update_controls();
		} break;
		case NOTIFICATION_ENTER_TREE: {

			btn_pick->set_icon(get_icon("screen_picker", "ColorPicker"));
			bt_add_preset->set_icon(get_icon("add_preset"));

			_update_color();
		} break;
		case NOTIFICATION_PARENTED: {

			for (int i = 0; i < 4; i++)
				set_margin((Margin)i, get_constant("margin"));
		} break;
		case NOTIFICATION_VISIBILITY_CHANGED: {

			Popup *p = Object::cast_to<Popup>(get_parent());
			if (p)
				p->set_size(Size2(get_combined_minimum_size().width + get_constant("margin") * 2, get_combined_minimum_size().height + get_constant("margin") * 2));
		} break;
		case MainLoop::NOTIFICATION_WM_QUIT_REQUEST: {

			if (screen != NULL) {
				if (screen->is_visible()) {
					screen->hide();
				}
			}
		} break;
	}
}

void ColorPicker::set_focus_on_line_edit() {

	c_text->grab_focus();
	c_text->select();
}

void ColorPicker::_update_controls() {

	if (edit_alpha) {
		values[3]->show();
		scroll[3]->show();
		labels[3]->show();
	} else {
		values[3]->hide();
		scroll[3]->hide();
		labels[3]->hide();
	}
}

void ColorPicker::set_pick_color(const Color &p_color) {

	color = p_color;
	if (color != last_hsv) {
		h = color.get_h();
		s = color.get_s();
		v = color.get_v();
		last_hsv = color;
	}

	if (!is_inside_tree())
		return;

	_update_color();
}

void ColorPicker::set_edit_alpha(bool p_show) {

	edit_alpha = p_show;
	_update_controls();

	if (!is_inside_tree())
		return;

	_update_color();
	sample->update();
}

bool ColorPicker::is_editing_alpha() const {

	return edit_alpha;
}

void ColorPicker::_value_changed(double) {

	if (updating)
		return;

	for (int i = 0; i < 4; i++) {
		color.components[i] = scroll[i]->get_value() / (raw_mode_enabled ? 1.0 : 255.0);
	}

	set_pick_color(color);
	emit_signal("color_changed", color);
}

void ColorPicker::_html_entered(const String &p_html) {

	if (updating)
		return;

	color = Color::html(p_html);

	if (!is_inside_tree())
		return;

	set_pick_color(color);
	emit_signal("color_changed", color);
}

void ColorPicker::_update_color() {

	updating = true;

	for (int i = 0; i < 4; i++) {
		scroll[i]->set_max(255);
		scroll[i]->set_step(0.01);
		if (raw_mode_enabled) {
			if (i == 3)
				scroll[i]->set_max(1);
			scroll[i]->set_value(color.components[i]);
		} else {
			scroll[i]->set_value(color.components[i] * 255);
		}
	}

	_update_text_value();

	sample->update();
	uv_edit->update();
	w_edit->update();
	updating = false;
}

void ColorPicker::_update_presets() {
	Size2 size = bt_add_preset->get_size();
	Size2 preset_size = Size2(size.width * presets.size(), size.height);
	preset->set_custom_minimum_size(preset_size);

	preset->draw_texture_rect(get_icon("preset_bg", "ColorPicker"), Rect2(Point2(), preset_size), true);

	for (int i = 0; i < presets.size(); i++) {
		preset->draw_rect(Rect2(Point2(size.width * i, 0), size), presets[i]);
	}
}

void ColorPicker::_text_type_toggled() {
	if (!Engine::get_singleton()->is_editor_hint())
		return;
	text_is_constructor = !text_is_constructor;
	if (text_is_constructor) {
		text_type->set_text("");
		text_type->set_icon(get_icon("Script", "EditorIcons"));
	} else {
		text_type->set_text("#");
		text_type->set_icon(NULL);
	}
	_update_color();
}

Color ColorPicker::get_pick_color() const {

	return color;
}

void ColorPicker::add_preset(const Color &p_color) {

	if (presets.find(p_color)) {
		presets.move_to_back(presets.find(p_color));
	} else {
		presets.push_back(p_color);
	}
	preset->update();
	if (presets.size() == 10)
		bt_add_preset->hide();
}

void ColorPicker::set_raw_mode(bool p_enabled) {

	if (raw_mode_enabled == p_enabled)
		return;
	raw_mode_enabled = p_enabled;
	if (btn_mode->is_pressed() != p_enabled)
		btn_mode->set_pressed(p_enabled);

	if (!is_inside_tree())
		return;

	_update_controls();
	_update_color();
}

bool ColorPicker::is_raw_mode() const {

	return raw_mode_enabled;
}

void ColorPicker::_update_text_value() {
	if (text_is_constructor) {
		String t = "Color(" + String::num(color.r) + "," + String::num(color.g) + "," + String::num(color.b);
		if (edit_alpha && color.a < 1)
			t += ("," + String::num(color.a) + ")");
		else
			t += ")";
		c_text->set_text(t);
	} else {
		c_text->set_text(color.to_html(edit_alpha && color.a < 1));
	}
}

void ColorPicker::_sample_draw() {
	Rect2 r = Rect2(Point2(), Size2(uv_edit->get_size().width, sample->get_size().height * 0.95));
	if (color.a < 1.0) {
		sample->draw_texture_rect(get_icon("preset_bg", "ColorPicker"), r, true);
	}
	sample->draw_rect(r, color);
}

void ColorPicker::_hsv_draw(int p_which, Control *c) {
	if (!c)
		return;
	if (p_which == 0) {
		Vector<Point2> points;
		points.push_back(Vector2());
		points.push_back(Vector2(c->get_size().x, 0));
		points.push_back(c->get_size());
		points.push_back(Vector2(0, c->get_size().y));
		Vector<Color> colors;
		colors.push_back(Color(1, 1, 1, 1));
		colors.push_back(Color(1, 1, 1, 1));
		colors.push_back(Color(0, 0, 0, 1));
		colors.push_back(Color(0, 0, 0, 1));
		c->draw_polygon(points, colors);
		Vector<Color> colors2;
		Color col = color;
		col.set_hsv(h, 1, 1);
		col.a = 0;
		colors2.push_back(col);
		col.a = 1;
		colors2.push_back(col);
		col.set_hsv(h, 1, 0);
		colors2.push_back(col);
		col.a = 0;
		colors2.push_back(col);
		c->draw_polygon(points, colors2);
		int x = CLAMP(c->get_size().x * s, 0, c->get_size().x);
		int y = CLAMP(c->get_size().y - c->get_size().y * v, 0, c->get_size().y);
		col = color;
		col.a = 1;
		c->draw_line(Point2(x, 0), Point2(x, c->get_size().y), col.inverted());
		c->draw_line(Point2(0, y), Point2(c->get_size().x, y), col.inverted());
		c->draw_line(Point2(x, y), Point2(x, y), Color(1, 1, 1), 2);
	} else if (p_which == 1) {
		Ref<Texture> hue = get_icon("color_hue", "ColorPicker");
		c->draw_texture_rect(hue, Rect2(Point2(), c->get_size()));
		int y = c->get_size().y - c->get_size().y * (1.0 - h);
		Color col = Color();
		col.set_hsv(h, 1, 1);
		c->draw_line(Point2(0, y), Point2(c->get_size().x, y), col.inverted());
	}
}

void ColorPicker::_uv_input(const Ref<InputEvent> &p_event) {

	Ref<InputEventMouseButton> bev = p_event;

	if (bev.is_valid()) {
		if (bev->is_pressed() && bev->get_button_index() == BUTTON_LEFT) {
			changing_color = true;
			float x = CLAMP((float)bev->get_position().x, 0, uv_edit->get_size().width);
			float y = CLAMP((float)bev->get_position().y, 0, uv_edit->get_size().height);
			s = x / uv_edit->get_size().width;
			v = 1.0 - y / uv_edit->get_size().height;
			color.set_hsv(h, s, v, color.a);
			last_hsv = color;
			set_pick_color(color);
			_update_color();
			emit_signal("color_changed", color);
		} else {
			changing_color = false;
		}
	}

	Ref<InputEventMouseMotion> mev = p_event;

	if (mev.is_valid()) {
		if (!changing_color)
			return;
		float x = CLAMP((float)mev->get_position().x, 0, uv_edit->get_size().width);
		float y = CLAMP((float)mev->get_position().y, 0, uv_edit->get_size().height);
		s = x / uv_edit->get_size().width;
		v = 1.0 - y / uv_edit->get_size().height;
		color.set_hsv(h, s, v, color.a);
		last_hsv = color;
		set_pick_color(color);
		_update_color();
		emit_signal("color_changed", color);
	}
}

void ColorPicker::_w_input(const Ref<InputEvent> &p_event) {

	Ref<InputEventMouseButton> bev = p_event;

	if (bev.is_valid()) {

		if (bev->is_pressed() && bev->get_button_index() == BUTTON_LEFT) {
			changing_color = true;
			float y = CLAMP((float)bev->get_position().y, 0, w_edit->get_size().height);
			h = y / w_edit->get_size().height;
		} else {
			changing_color = false;
		}
		color.set_hsv(h, s, v, color.a);
		last_hsv = color;
		set_pick_color(color);
		_update_color();
		emit_signal("color_changed", color);
	}

	Ref<InputEventMouseMotion> mev = p_event;

	if (mev.is_valid()) {

		if (!changing_color)
			return;
		float y = CLAMP((float)mev->get_position().y, 0, w_edit->get_size().height);
		h = y / w_edit->get_size().height;
		color.set_hsv(h, s, v, color.a);
		last_hsv = color;
		set_pick_color(color);
		_update_color();
		emit_signal("color_changed", color);
	}
}

void ColorPicker::_preset_input(const Ref<InputEvent> &p_event) {

	Ref<InputEventMouseButton> bev = p_event;

	if (bev.is_valid()) {

		if (bev->is_pressed() && bev->get_button_index() == BUTTON_LEFT) {
			int index = bev->get_position().x / (preset->get_size().x / presets.size());
			set_pick_color(presets[index]);
		} else if (bev->is_pressed() && bev->get_button_index() == BUTTON_RIGHT) {
			int index = bev->get_position().x / (preset->get_size().x / presets.size());
			presets.erase(presets[index]);
			preset->update();
			bt_add_preset->show();
		}
		_update_color();
		emit_signal("color_changed", color);
	}

	Ref<InputEventMouseMotion> mev = p_event;

	if (mev.is_valid()) {

		int index = mev->get_position().x * presets.size();
		if (preset->get_size().x != 0) {
			index /= preset->get_size().x;
		}
		if (index < 0 || index >= presets.size())
			return;
		preset->set_tooltip("Color: #" + presets[index].to_html(presets[index].a < 1) + "\n"
																						"LMB: Set color\n"
																						"RMB: Remove preset");
	}
}

void ColorPicker::_screen_input(const Ref<InputEvent> &p_event) {

	Ref<InputEventMouseButton> bev = p_event;

	if (bev.is_valid()) {

		if (bev->get_button_index() == BUTTON_LEFT && !bev->is_pressed()) {
			emit_signal("color_changed", color);
			screen->hide();
		}
	}

	Ref<InputEventMouseMotion> mev = p_event;

	if (mev.is_valid()) {
		Viewport *r = get_tree()->get_root();
		if (!r->get_visible_rect().has_point(Point2(mev->get_global_position().x, mev->get_global_position().y)))
			return;
		Ref<Image> img = r->get_texture()->get_data();
		if (img.is_valid() && !img->empty()) {
			img->lock();
			Vector2 ofs = mev->get_global_position() - r->get_visible_rect().get_position();
			Color c = img->get_pixel(ofs.x, r->get_visible_rect().size.height - ofs.y);
			img->unlock();
			set_pick_color(c);
		}
	}
}

void ColorPicker::_add_preset_pressed() {
	add_preset(color);
}

void ColorPicker::_screen_pick_pressed() {
	Viewport *r = get_tree()->get_root();
	if (!screen) {
		screen = memnew(Control);
		r->add_child(screen);
		screen->set_as_toplevel(true);
		screen->set_anchors_and_margins_preset(Control::PRESET_WIDE);
		screen->set_default_cursor_shape(CURSOR_POINTING_HAND);
		screen->connect("gui_input", this, "_screen_input");
	}
	screen->raise();
	screen->show_modal();
}

void ColorPicker::_bind_methods() {

	ClassDB::bind_method(D_METHOD("set_pick_color", "color"), &ColorPicker::set_pick_color);
	ClassDB::bind_method(D_METHOD("get_pick_color"), &ColorPicker::get_pick_color);
	ClassDB::bind_method(D_METHOD("set_raw_mode", "mode"), &ColorPicker::set_raw_mode);
	ClassDB::bind_method(D_METHOD("is_raw_mode"), &ColorPicker::is_raw_mode);
	ClassDB::bind_method(D_METHOD("set_edit_alpha", "show"), &ColorPicker::set_edit_alpha);
	ClassDB::bind_method(D_METHOD("is_editing_alpha"), &ColorPicker::is_editing_alpha);
	ClassDB::bind_method(D_METHOD("add_preset", "color"), &ColorPicker::add_preset);
	ClassDB::bind_method(D_METHOD("_value_changed"), &ColorPicker::_value_changed);
	ClassDB::bind_method(D_METHOD("_html_entered"), &ColorPicker::_html_entered);
	ClassDB::bind_method(D_METHOD("_text_type_toggled"), &ColorPicker::_text_type_toggled);
	ClassDB::bind_method(D_METHOD("_add_preset_pressed"), &ColorPicker::_add_preset_pressed);
	ClassDB::bind_method(D_METHOD("_screen_pick_pressed"), &ColorPicker::_screen_pick_pressed);
	ClassDB::bind_method(D_METHOD("_sample_draw"), &ColorPicker::_sample_draw);
	ClassDB::bind_method(D_METHOD("_update_presets"), &ColorPicker::_update_presets);
	ClassDB::bind_method(D_METHOD("_hsv_draw"), &ColorPicker::_hsv_draw);
	ClassDB::bind_method(D_METHOD("_uv_input"), &ColorPicker::_uv_input);
	ClassDB::bind_method(D_METHOD("_w_input"), &ColorPicker::_w_input);
	ClassDB::bind_method(D_METHOD("_preset_input"), &ColorPicker::_preset_input);
	ClassDB::bind_method(D_METHOD("_screen_input"), &ColorPicker::_screen_input);

	ADD_SIGNAL(MethodInfo("color_changed", PropertyInfo(Variant::COLOR, "color")));
}

ColorPicker::ColorPicker() :
		BoxContainer(true) {

	updating = true;
	edit_alpha = true;
	text_is_constructor = false;
	raw_mode_enabled = false;
	changing_color = false;
	screen = NULL;

	HBoxContainer *hb_smpl = memnew(HBoxContainer);
	btn_pick = memnew(ToolButton);
	btn_pick->connect("pressed", this, "_screen_pick_pressed");

	sample = memnew(TextureRect);
	sample->set_h_size_flags(SIZE_EXPAND_FILL);
	sample->connect("draw", this, "_sample_draw");

	hb_smpl->add_child(sample);
	hb_smpl->add_child(btn_pick);
	add_child(hb_smpl);

	HBoxContainer *hb_edit = memnew(HBoxContainer);
	hb_edit->set_v_size_flags(SIZE_EXPAND_FILL);

	uv_edit = memnew(Control);

	uv_edit->connect("gui_input", this, "_uv_input");
	uv_edit->set_mouse_filter(MOUSE_FILTER_PASS);
	uv_edit->set_h_size_flags(SIZE_EXPAND_FILL);
	uv_edit->set_v_size_flags(SIZE_EXPAND_FILL);
	uv_edit->set_custom_minimum_size(Size2(get_constant("sv_width"), get_constant("sv_height")));
	uv_edit->connect("draw", this, "_hsv_draw", make_binds(0, uv_edit));

	add_child(hb_edit);

	w_edit = memnew(Control);
	w_edit->set_custom_minimum_size(Size2(get_constant("h_width"), 0));
	w_edit->set_h_size_flags(SIZE_FILL);
	w_edit->set_v_size_flags(SIZE_EXPAND_FILL);
	w_edit->connect("gui_input", this, "_w_input");
	w_edit->connect("draw", this, "_hsv_draw", make_binds(1, w_edit));

	hb_edit->add_child(uv_edit);
	hb_edit->add_child(memnew(VSeparator));
	hb_edit->add_child(w_edit);

	VBoxContainer *vbl = memnew(VBoxContainer);
	add_child(vbl);

	add_child(memnew(HSeparator));

	VBoxContainer *vbr = memnew(VBoxContainer);
	add_child(vbr);
	vbr->set_h_size_flags(SIZE_EXPAND_FILL);
	const char *lt[4] = { "R", "G", "B", "A" };

	for (int i = 0; i < 4; i++) {

		HBoxContainer *hbc = memnew(HBoxContainer);

		labels[i] = memnew(Label(lt[i]));
		labels[i]->set_custom_minimum_size(Size2(get_constant("label_width"), 0));
		labels[i]->set_v_size_flags(SIZE_SHRINK_CENTER);
		hbc->add_child(labels[i]);

		scroll[i] = memnew(HSlider);
		scroll[i]->set_v_size_flags(SIZE_SHRINK_CENTER);
		hbc->add_child(scroll[i]);

		values[i] = memnew(SpinBox);
		scroll[i]->share(values[i]);
		hbc->add_child(values[i]);

		scroll[i]->set_min(0);
		scroll[i]->set_page(0);
		scroll[i]->set_h_size_flags(SIZE_EXPAND_FILL);

		scroll[i]->connect("value_changed", this, "_value_changed");

		vbr->add_child(hbc);
	}

	HBoxContainer *hhb = memnew(HBoxContainer);

	btn_mode = memnew(CheckButton);
	btn_mode->set_text(TTR("Raw Mode"));
	btn_mode->connect("toggled", this, "set_raw_mode");
	hhb->add_child(btn_mode);
	vbr->add_child(hhb);
	text_type = memnew(Button);
	text_type->set_flat(true);
	text_type->connect("pressed", this, "_text_type_toggled");
	hhb->add_child(text_type);

	c_text = memnew(LineEdit);
	hhb->add_child(c_text);
	c_text->connect("text_entered", this, "_html_entered");
	text_type->set_text("#");
	c_text->set_h_size_flags(SIZE_EXPAND_FILL);

	_update_controls();
	updating = false;

	set_pick_color(Color(1, 1, 1));

	HBoxContainer *bbc = memnew(HBoxContainer);
	add_child(bbc);

	preset = memnew(TextureRect);
	bbc->add_child(preset);
	preset->connect("gui_input", this, "_preset_input");
	preset->connect("draw", this, "_update_presets");

	bt_add_preset = memnew(Button);
	bt_add_preset->set_tooltip(TTR("Add current color as a preset"));
	bt_add_preset->connect("pressed", this, "_add_preset_pressed");
	bbc->add_child(bt_add_preset);
}

/////////////////

void ColorPickerButton::_color_changed(const Color &p_color) {

	update();
	emit_signal("color_changed", p_color);
}

void ColorPickerButton::pressed() {

	popup->set_position(get_global_position() - picker->get_combined_minimum_size());
	popup->popup();
	picker->set_focus_on_line_edit();
}

void ColorPickerButton::_notification(int p_what) {

	if (p_what == NOTIFICATION_DRAW) {

		Ref<StyleBox> normal = get_stylebox("normal");
		Rect2 r = Rect2(normal->get_offset(), get_size() - normal->get_minimum_size());
		draw_texture_rect(Control::get_icon("bg", "ColorPickerButton"), r, true);
		draw_rect(r, picker->get_pick_color());
	}

	if (p_what == MainLoop::NOTIFICATION_WM_QUIT_REQUEST) {
		popup->hide();
	}
}

void ColorPickerButton::set_pick_color(const Color &p_color) {

	picker->set_pick_color(p_color);
	update();
	emit_signal("color_changed", p_color);
}
Color ColorPickerButton::get_pick_color() const {

	return picker->get_pick_color();
}

void ColorPickerButton::set_edit_alpha(bool p_show) {

	picker->set_edit_alpha(p_show);
}

bool ColorPickerButton::is_editing_alpha() const {

	return picker->is_editing_alpha();
}

ColorPicker *ColorPickerButton::get_picker() const {

	return picker;
}

PopupPanel *ColorPickerButton::get_popup() const {

	return popup;
}

void ColorPickerButton::_bind_methods() {

	ClassDB::bind_method(D_METHOD("set_pick_color", "color"), &ColorPickerButton::set_pick_color);
	ClassDB::bind_method(D_METHOD("get_pick_color"), &ColorPickerButton::get_pick_color);
	ClassDB::bind_method(D_METHOD("get_picker"), &ColorPickerButton::get_picker);
	ClassDB::bind_method(D_METHOD("get_popup"), &ColorPickerButton::get_popup);
	ClassDB::bind_method(D_METHOD("set_edit_alpha", "show"), &ColorPickerButton::set_edit_alpha);
	ClassDB::bind_method(D_METHOD("is_editing_alpha"), &ColorPickerButton::is_editing_alpha);
	ClassDB::bind_method(D_METHOD("_color_changed"), &ColorPickerButton::_color_changed);

	ADD_SIGNAL(MethodInfo("color_changed", PropertyInfo(Variant::COLOR, "color")));
	ADD_PROPERTY(PropertyInfo(Variant::COLOR, "color"), "set_pick_color", "get_pick_color");
	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "edit_alpha"), "set_edit_alpha", "is_editing_alpha");
}

ColorPickerButton::ColorPickerButton() {

	popup = memnew(PopupPanel);
	picker = memnew(ColorPicker);
	popup->add_child(picker);

	picker->connect("color_changed", this, "_color_changed");
	add_child(popup);
}