/*************************************************************************/
/*  color_picker.cpp                                                     */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                    http://www.godotengine.org                         */
/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2017 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 update_material(Ref<CanvasItemMaterial> mat, const Color &p_color, float h, float s, float v) {
	if (!mat.is_valid())
		return;
	Ref<Shader> sdr = mat->get_shader();
	if (!sdr.is_valid())
		return;

	mat->set_shader_param("R", p_color.r);
	mat->set_shader_param("G", p_color.g);
	mat->set_shader_param("B", p_color.b);
	mat->set_shader_param("H", h);
	mat->set_shader_param("S", s);
	mat->set_shader_param("V", v);
	mat->set_shader_param("A", p_color.a);
}

void ColorPicker::_notification(int p_what) {

	switch (p_what) {
		case NOTIFICATION_THEME_CHANGED: {
			uv_material->set_shader(get_shader("uv_editor"));
			w_material->set_shader(get_shader("w_editor"));
			update_material(uv_material, color, h, s, v);
			update_material(w_material, color, h, s, v);
			_update_controls();
		} break;

		case NOTIFICATION_ENTER_TREE: {
			btn_pick->set_icon(get_icon("screen_picker", "ColorPicker"));
			update_material(uv_material, color, h, s, v);
			update_material(w_material, color, h, s, v);

			uv_edit->get_child(0)->cast_to<Control>()->update();
			w_edit->get_child(0)->cast_to<Control>()->update();
			_update_color();
		}
	}
}

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_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_material(uv_material, color, h, s, v);
	update_material(w_material, color, h, s, v);

	uv_edit->get_child(0)->cast_to<Control>()->update();
	w_edit->get_child(0)->cast_to<Control>()->update();
	_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_val() / (raw_mode_enabled ? 1.0 : 255.0);
	}

	set_color(color);

	_update_text_value();

	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_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_val(color.components[i]);
		} else {
			scroll[i]->set_val(color.components[i] * 255);
		}
	}

	_update_text_value();

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

void ColorPicker::_update_presets() {
	Size2 size = bt_add_preset->get_size();
	preset->set_custom_minimum_size(Size2(size.width * presets.size(), size.height));
	Image i(size.x * presets.size(), size.y, false, Image::FORMAT_RGB);
	for (int y = 0; y < size.y; y++)
		for (int x = 0; x < size.x * presets.size(); x++)
			i.put_pixel(x, y, presets[(int)x / size.x]);
	Ref<ImageTexture> t;
	t.instance();
	t->create_from_image(i);
	preset->set_texture(t);
}

void ColorPicker::_text_type_toggled() {
	if (!get_tree()->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_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);
	}
	_update_presets();
	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() {
	sample->draw_rect(Rect2(Point2(), Size2(256, 20)), color);
}

void ColorPicker::_hsv_draw(int p_wich, Control *c) {
	if (!c)
		return;
	if (p_wich == 0) {
		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);
		Color 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_wich == 1) {
		int y = c->get_size().y - c->get_size().y * 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 InputEvent &ev) {
	if (ev.type == InputEvent::MOUSE_BUTTON) {
		const InputEventMouseButton &bev = ev.mouse_button;
		if (bev.pressed && bev.button_index == BUTTON_LEFT) {
			changing_color = true;
			float x = CLAMP((float)bev.x, 0, 256);
			float y = CLAMP((float)bev.y, 0, 256);
			s = x / 256;
			v = 1.0 - y / 256.0;
			color.set_hsv(h, s, v, color.a);
			last_hsv = color;
			set_color(color);
			_update_color();
			emit_signal("color_changed", color);
		} else {
			changing_color = false;
		}
	} else if (ev.type == InputEvent::MOUSE_MOTION) {
		const InputEventMouse &bev = ev.mouse_motion;
		if (!changing_color)
			return;
		float x = CLAMP((float)bev.x, 0, 256);
		float y = CLAMP((float)bev.y, 0, 256);
		s = x / 256;
		v = 1.0 - y / 256.0;
		color.set_hsv(h, s, v, color.a);
		last_hsv = color;
		set_color(color);
		_update_color();
		emit_signal("color_changed", color);
	}
}

void ColorPicker::_w_input(const InputEvent &ev) {
	if (ev.type == InputEvent::MOUSE_BUTTON) {
		const InputEventMouseButton &bev = ev.mouse_button;
		if (bev.pressed && bev.button_index == BUTTON_LEFT) {
			changing_color = true;
			h = 1 - ((float)bev.y) / 256.0;

		} else {
			changing_color = false;
		}
		color.set_hsv(h, s, v, color.a);
		last_hsv = color;
		set_color(color);
		_update_color();
		emit_signal("color_changed", color);
	} else if (ev.type == InputEvent::MOUSE_MOTION) {
		const InputEventMouse &bev = ev.mouse_motion;
		if (!changing_color)
			return;
		float y = CLAMP((float)bev.y, 0, 256);
		h = 1.0 - y / 256.0;
		color.set_hsv(h, s, v, color.a);
		last_hsv = color;
		set_color(color);
		_update_color();
		emit_signal("color_changed", color);
	}
}

void ColorPicker::_preset_input(const InputEvent &ev) {
	if (ev.type == InputEvent::MOUSE_BUTTON) {
		const InputEventMouseButton &bev = ev.mouse_button;
		if (bev.pressed && bev.button_index == BUTTON_LEFT) {
			int index = bev.x / (preset->get_size().x / presets.size());
			set_color(presets[index]);
		} else if (bev.pressed && bev.button_index == BUTTON_RIGHT) {
			int index = bev.x / (preset->get_size().x / presets.size());
			presets.erase(presets[index]);
			_update_presets();
			bt_add_preset->show();
		}
		_update_color();
		emit_signal("color_changed", color);
	} else if (ev.type == InputEvent::MOUSE_MOTION) {
		const InputEventMouse &mev = ev.mouse_motion;
		int index = mev.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 InputEvent &ev) {
	if (ev.type == InputEvent::MOUSE_BUTTON) {
		const InputEventMouseButton &bev = ev.mouse_button;
		if (bev.button_index == BUTTON_LEFT && !bev.pressed) {
			emit_signal("color_changed", color);
			screen->hide();
		}
	} else if (ev.type == InputEvent::MOUSE_MOTION) {
		const InputEventMouse &mev = ev.mouse_motion;
		Viewport *r = get_tree()->get_root();
		if (!r->get_rect().has_point(Point2(mev.global_x, mev.global_y)))
			return;
		Image img = r->get_screen_capture();
		if (!img.empty())
			last_capture = img;
		r->queue_screen_capture();
		if (!last_capture.empty())
			set_color(last_capture.get_pixel(mev.global_x, mev.global_y));
	}
}

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_area_as_parent_rect();
		screen->connect("input_event", this, "_screen_input");
	}
	screen->raise();
	screen->show_modal();
	r->queue_screen_capture();
}

void ColorPicker::_bind_methods() {

	ObjectTypeDB::bind_method(_MD("set_color", "color"), &ColorPicker::set_color);
	ObjectTypeDB::bind_method(_MD("get_color"), &ColorPicker::get_color);
	ObjectTypeDB::bind_method(_MD("set_raw_mode", "mode"), &ColorPicker::set_raw_mode);
	ObjectTypeDB::bind_method(_MD("is_raw_mode"), &ColorPicker::is_raw_mode);
	ObjectTypeDB::bind_method(_MD("set_edit_alpha", "show"), &ColorPicker::set_edit_alpha);
	ObjectTypeDB::bind_method(_MD("is_editing_alpha"), &ColorPicker::is_editing_alpha);
	ObjectTypeDB::bind_method(_MD("add_preset"), &ColorPicker::add_preset);
	ObjectTypeDB::bind_method(_MD("_value_changed"), &ColorPicker::_value_changed);
	ObjectTypeDB::bind_method(_MD("_html_entered"), &ColorPicker::_html_entered);
	ObjectTypeDB::bind_method(_MD("_text_type_toggled"), &ColorPicker::_text_type_toggled);
	ObjectTypeDB::bind_method(_MD("_add_preset_pressed"), &ColorPicker::_add_preset_pressed);
	ObjectTypeDB::bind_method(_MD("_screen_pick_pressed"), &ColorPicker::_screen_pick_pressed);
	ObjectTypeDB::bind_method(_MD("_sample_draw"), &ColorPicker::_sample_draw);
	ObjectTypeDB::bind_method(_MD("_hsv_draw"), &ColorPicker::_hsv_draw);
	ObjectTypeDB::bind_method(_MD("_uv_input"), &ColorPicker::_uv_input);
	ObjectTypeDB::bind_method(_MD("_w_input"), &ColorPicker::_w_input);
	ObjectTypeDB::bind_method(_MD("_preset_input"), &ColorPicker::_preset_input);
	ObjectTypeDB::bind_method(_MD("_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(TextureFrame);
	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);

	uv_edit = memnew(TextureFrame);
	Image i(256, 256, false, Image::FORMAT_RGB);
	for (int y = 0; y < 256; y++)
		for (int x = 0; x < 256; x++)
			i.put_pixel(x, y, Color());
	Ref<ImageTexture> t;
	t.instance();
	t->create_from_image(i);
	uv_edit->set_texture(t);
	uv_edit->set_ignore_mouse(false);
	uv_edit->set_custom_minimum_size(Size2(256, 256));
	uv_edit->connect("input_event", this, "_uv_input");
	Control *c = memnew(Control);
	uv_edit->add_child(c);
	c->set_area_as_parent_rect();
	c->set_stop_mouse(false);
	c->set_material(memnew(CanvasItemMaterial));
	Vector<Variant> args = Vector<Variant>();
	args.push_back(0);
	args.push_back(c);
	c->connect("draw", this, "_hsv_draw", args);

	add_child(hb_edit);
	w_edit = memnew(TextureFrame);
	i = Image(15, 256, false, Image::FORMAT_RGB);
	for (int y = 0; y < 256; y++)
		for (int x = 0; x < 15; x++)
			i.put_pixel(x, y, Color());
	Ref<ImageTexture> tw;
	tw.instance();
	tw->create_from_image(i);
	w_edit->set_texture(tw);
	w_edit->set_ignore_mouse(false);
	w_edit->set_custom_minimum_size(Size2(15, 256));
	w_edit->connect("input_event", this, "_w_input");
	c = memnew(Control);
	w_edit->add_child(c);
	c->set_area_as_parent_rect();
	c->set_stop_mouse(false);
	c->set_material(memnew(CanvasItemMaterial));
	args.clear();
	args.push_back(1);
	args.push_back(c);
	c->connect("draw", this, "_hsv_draw", args);

	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]));
		hbc->add_child(labels[i]);

		scroll[i] = memnew(HSlider);
		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("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();
	//_update_color();
	updating = false;

	uv_material.instance();
	Ref<Shader> s_uv = get_shader("uv_editor");
	uv_material->set_shader(s_uv);

	w_material.instance();

	Ref<Shader> s_w = get_shader("w_editor");
	w_material->set_shader(s_w);

	uv_edit->set_material(uv_material);
	w_edit->set_material(w_material);

	set_color(Color(1, 1, 1));

	i.create(256, 20, false, Image::FORMAT_RGB);
	for (int y = 0; y < 20; y++)
		for (int x = 0; x < 256; x++)
			if ((x / 4 + y / 4) % 2)
				i.put_pixel(x, y, Color(1, 1, 1));
			else
				i.put_pixel(x, y, Color(0.6, 0.6, 0.6));
	Ref<ImageTexture> t_smpl;
	t_smpl.instance();
	t_smpl->create_from_image(i);
	sample->set_texture(t_smpl);

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

	preset = memnew(TextureFrame);
	bbc->add_child(preset);
	preset->set_ignore_mouse(false);
	preset->connect("input_event", this, "_preset_input");

	bt_add_preset = memnew(Button);
	bt_add_preset->set_icon(get_icon("add_preset"));
	bt_add_preset->set_tooltip("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() {

	Size2 ms = Size2(300, picker->get_combined_minimum_size().height + 10);
	popup->set_pos(get_global_pos() - Size2(0, ms.height));
	popup->set_size(ms);
	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");
		draw_rect(Rect2(normal->get_offset(), get_size() - normal->get_minimum_size()), picker->get_color());
	}
}

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

	picker->set_color(p_color);
	update();
}
Color ColorPickerButton::get_color() const {

	return picker->get_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() {
	return picker;
}

void ColorPickerButton::_bind_methods() {

	ObjectTypeDB::bind_method(_MD("set_color", "color"), &ColorPickerButton::set_color);
	ObjectTypeDB::bind_method(_MD("get_color"), &ColorPickerButton::get_color);
	ObjectTypeDB::bind_method(_MD("get_picker:ColorPicker"), &ColorPickerButton::get_picker);
	ObjectTypeDB::bind_method(_MD("set_edit_alpha", "show"), &ColorPickerButton::set_edit_alpha);
	ObjectTypeDB::bind_method(_MD("is_editing_alpha"), &ColorPickerButton::is_editing_alpha);
	ObjectTypeDB::bind_method(_MD("_color_changed"), &ColorPickerButton::_color_changed);

	ADD_SIGNAL(MethodInfo("color_changed", PropertyInfo(Variant::COLOR, "color")));
	ADD_PROPERTY(PropertyInfo(Variant::COLOR, "color"), _SCS("set_color"), _SCS("get_color"));
	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "edit_alpha"), _SCS("set_edit_alpha"), _SCS("is_editing_alpha"));
}

ColorPickerButton::ColorPickerButton() {

	popup = memnew(PopupPanel);
	picker = memnew(ColorPicker);
	popup->add_child(picker);
	popup->set_child_rect(picker);
	picker->connect("color_changed", this, "_color_changed");
	add_child(popup);
}