/*************************************************************************/
/*  gradient_editor_plugin.cpp                                           */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
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/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
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/*************************************************************************/

#include "gradient_editor_plugin.h"

#include "canvas_item_editor_plugin.h"
#include "editor/editor_scale.h"
#include "node_3d_editor_plugin.h"

Size2 GradientEditor::get_minimum_size() const {
	return Size2(0, 60) * EDSCALE;
}

void GradientEditor::_gradient_changed() {
	if (editing) {
		return;
	}

	editing = true;
	Vector<Gradient::Point> points = gradient->get_points();
	set_points(points);
	set_interpolation_mode(gradient->get_interpolation_mode());
	update();
	editing = false;
}

void GradientEditor::_ramp_changed() {
	editing = true;
	UndoRedo *undo_redo = EditorNode::get_singleton()->get_undo_redo();
	undo_redo->create_action(TTR("Gradient Edited"));
	undo_redo->add_do_method(gradient.ptr(), "set_offsets", get_offsets());
	undo_redo->add_do_method(gradient.ptr(), "set_colors", get_colors());
	undo_redo->add_do_method(gradient.ptr(), "set_interpolation_mode", get_interpolation_mode());
	undo_redo->add_undo_method(gradient.ptr(), "set_offsets", gradient->get_offsets());
	undo_redo->add_undo_method(gradient.ptr(), "set_colors", gradient->get_colors());
	undo_redo->add_undo_method(gradient.ptr(), "set_interpolation_mode", gradient->get_interpolation_mode());
	undo_redo->commit_action();
	editing = false;
}

void GradientEditor::_bind_methods() {
}

void GradientEditor::set_gradient(const Ref<Gradient> &p_gradient) {
	gradient = p_gradient;
	connect("ramp_changed", callable_mp(this, &GradientEditor::_ramp_changed));
	gradient->connect("changed", callable_mp(this, &GradientEditor::_gradient_changed));
	set_points(gradient->get_points());
	set_interpolation_mode(gradient->get_interpolation_mode());
}

void GradientEditor::reverse_gradient() {
	gradient->reverse();
	set_points(gradient->get_points());
	emit_signal(SNAME("ramp_changed"));
	update();
}

GradientEditor::GradientEditor() {
	editing = false;
}

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

void GradientReverseButton::_notification(int p_what) {
	if (p_what == NOTIFICATION_DRAW) {
		Ref<Texture2D> icon = get_theme_icon(SNAME("ReverseGradient"), SNAME("EditorIcons"));
		if (is_pressed()) {
			draw_texture_rect(icon, Rect2(margin, margin, icon->get_width(), icon->get_height()), false, get_theme_color(SNAME("icon_pressed_color"), SNAME("Button")));
		} else {
			draw_texture_rect(icon, Rect2(margin, margin, icon->get_width(), icon->get_height()));
		}
	}
}

Size2 GradientReverseButton::get_minimum_size() const {
	return (get_theme_icon(SNAME("ReverseGradient"), SNAME("EditorIcons"))->get_size() + Size2(margin * 2, margin * 2));
}

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

bool EditorInspectorPluginGradient::can_handle(Object *p_object) {
	return Object::cast_to<Gradient>(p_object) != nullptr;
}

void EditorInspectorPluginGradient::parse_begin(Object *p_object) {
	Gradient *gradient = Object::cast_to<Gradient>(p_object);
	Ref<Gradient> g(gradient);

	editor = memnew(GradientEditor);
	editor->set_gradient(g);
	add_custom_control(editor);

	int picker_shape = EDITOR_GET("interface/inspector/default_color_picker_shape");
	editor->get_picker()->set_picker_shape((ColorPicker::PickerShapeType)picker_shape);

	reverse_btn = memnew(GradientReverseButton);

	gradient_tools_hbox = memnew(HBoxContainer);
	gradient_tools_hbox->add_child(reverse_btn);

	add_custom_control(gradient_tools_hbox);

	reverse_btn->connect("pressed", callable_mp(this, &EditorInspectorPluginGradient::_reverse_button_pressed));
	reverse_btn->set_tooltip(TTR("Reverse/mirror gradient."));
}

void EditorInspectorPluginGradient::_reverse_button_pressed() {
	editor->reverse_gradient();
}

GradientEditorPlugin::GradientEditorPlugin(EditorNode *p_node) {
	Ref<EditorInspectorPluginGradient> plugin;
	plugin.instantiate();
	add_inspector_plugin(plugin);
}