/*************************************************************************/
/*  gpu_particles_2d_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 "gpu_particles_2d_editor_plugin.h"

#include "canvas_item_editor_plugin.h"
#include "core/io/image_loader.h"
#include "scene/2d/cpu_particles_2d.h"
#include "scene/gui/separator.h"
#include "scene/resources/particles_material.h"

void GPUParticles2DEditorPlugin::edit(Object *p_object) {
	particles = Object::cast_to<GPUParticles2D>(p_object);
}

bool GPUParticles2DEditorPlugin::handles(Object *p_object) const {
	return p_object->is_class("GPUParticles2D");
}

void GPUParticles2DEditorPlugin::make_visible(bool p_visible) {
	if (p_visible) {
		toolbar->show();
	} else {
		toolbar->hide();
	}
}

void GPUParticles2DEditorPlugin::_file_selected(const String &p_file) {
	source_emission_file = p_file;
	emission_mask->popup_centered();
}

void GPUParticles2DEditorPlugin::_selection_changed() {
	List<Node *> selected_nodes = editor->get_editor_selection()->get_selected_node_list();

	if (selected_particles.is_empty() && selected_nodes.is_empty()) {
		return;
	}

	for (GPUParticles2D *SP : selected_particles) {
		SP->set_show_visibility_rect(false);
	}
	selected_particles.clear();

	for (Node *P : selected_nodes) {
		GPUParticles2D *selected_particle = Object::cast_to<GPUParticles2D>(P);
		if (selected_particle != nullptr) {
			selected_particle->set_show_visibility_rect(true);
			selected_particles.push_back(selected_particle);
		}
	}
}

void GPUParticles2DEditorPlugin::_menu_callback(int p_idx) {
	switch (p_idx) {
		case MENU_GENERATE_VISIBILITY_RECT: {
			// Add one second to the default generation lifetime, since the progress is updated every second.
			generate_seconds->set_value(MAX(1.0, trunc(particles->get_lifetime()) + 1.0));

			if (generate_seconds->get_value() >= 11.0 + CMP_EPSILON) {
				// Only pop up the time dialog if the particle's lifetime is long enough to warrant shortening it.
				generate_visibility_rect->popup_centered();
			} else {
				// Generate the visibility rect immediately.
				_generate_visibility_rect();
			}
		} break;
		case MENU_LOAD_EMISSION_MASK: {
			file->popup_file_dialog();

		} break;
		case MENU_CLEAR_EMISSION_MASK: {
			emission_mask->popup_centered();
		} break;
		case MENU_OPTION_CONVERT_TO_CPU_PARTICLES: {
			CPUParticles2D *cpu_particles = memnew(CPUParticles2D);
			cpu_particles->convert_from_particles(particles);
			cpu_particles->set_name(particles->get_name());
			cpu_particles->set_transform(particles->get_transform());
			cpu_particles->set_visible(particles->is_visible());
			cpu_particles->set_process_mode(particles->get_process_mode());
			cpu_particles->set_z_index(particles->get_z_index());

			UndoRedo *ur = EditorNode::get_singleton()->get_undo_redo();
			ur->create_action(TTR("Convert to CPUParticles2D"));
			ur->add_do_method(EditorNode::get_singleton()->get_scene_tree_dock(), "replace_node", particles, cpu_particles, true, false);
			ur->add_do_reference(cpu_particles);
			ur->add_undo_method(EditorNode::get_singleton()->get_scene_tree_dock(), "replace_node", cpu_particles, particles, false, false);
			ur->add_undo_reference(particles);
			ur->commit_action();

		} break;
		case MENU_RESTART: {
			particles->restart();
		}
	}
}

void GPUParticles2DEditorPlugin::_generate_visibility_rect() {
	double time = generate_seconds->get_value();

	float running = 0.0;

	EditorProgress ep("gen_vrect", TTR("Generating Visibility Rect (Waiting for Particle Simulation)"), int(time));

	bool was_emitting = particles->is_emitting();
	if (!was_emitting) {
		particles->set_emitting(true);
		OS::get_singleton()->delay_usec(1000);
	}

	Rect2 rect;
	while (running < time) {
		uint64_t ticks = OS::get_singleton()->get_ticks_usec();
		ep.step("Generating...", int(running), true);
		OS::get_singleton()->delay_usec(1000);

		Rect2 capture = particles->capture_rect();
		if (rect == Rect2()) {
			rect = capture;
		} else {
			rect = rect.merge(capture);
		}

		running += (OS::get_singleton()->get_ticks_usec() - ticks) / 1000000.0;
	}

	if (!was_emitting) {
		particles->set_emitting(false);
	}

	undo_redo->create_action(TTR("Generate Visibility Rect"));
	undo_redo->add_do_method(particles, "set_visibility_rect", rect);
	undo_redo->add_undo_method(particles, "set_visibility_rect", particles->get_visibility_rect());
	undo_redo->commit_action();
}

void GPUParticles2DEditorPlugin::_generate_emission_mask() {
	Ref<ParticlesMaterial> pm = particles->get_process_material();
	if (!pm.is_valid()) {
		EditorNode::get_singleton()->show_warning(TTR("Can only set point into a ParticlesMaterial process material"));
		return;
	}

	Ref<Image> img;
	img.instantiate();
	Error err = ImageLoader::load_image(source_emission_file, img);
	ERR_FAIL_COND_MSG(err != OK, "Error loading image '" + source_emission_file + "'.");

	if (img->is_compressed()) {
		img->decompress();
	}
	img->convert(Image::FORMAT_RGBA8);
	ERR_FAIL_COND(img->get_format() != Image::FORMAT_RGBA8);
	Size2i s = img->get_size();
	ERR_FAIL_COND(s.width == 0 || s.height == 0);

	Vector<Point2> valid_positions;
	Vector<Point2> valid_normals;
	Vector<uint8_t> valid_colors;

	valid_positions.resize(s.width * s.height);

	EmissionMode emode = (EmissionMode)emission_mask_mode->get_selected();

	if (emode == EMISSION_MODE_BORDER_DIRECTED) {
		valid_normals.resize(s.width * s.height);
	}

	bool capture_colors = emission_colors->is_pressed();

	if (capture_colors) {
		valid_colors.resize(s.width * s.height * 4);
	}

	int vpc = 0;

	{
		Vector<uint8_t> data = img->get_data();
		const uint8_t *r = data.ptr();

		for (int i = 0; i < s.width; i++) {
			for (int j = 0; j < s.height; j++) {
				uint8_t a = r[(j * s.width + i) * 4 + 3];

				if (a > 128) {
					if (emode == EMISSION_MODE_SOLID) {
						if (capture_colors) {
							valid_colors.write[vpc * 4 + 0] = r[(j * s.width + i) * 4 + 0];
							valid_colors.write[vpc * 4 + 1] = r[(j * s.width + i) * 4 + 1];
							valid_colors.write[vpc * 4 + 2] = r[(j * s.width + i) * 4 + 2];
							valid_colors.write[vpc * 4 + 3] = r[(j * s.width + i) * 4 + 3];
						}
						valid_positions.write[vpc++] = Point2(i, j);

					} else {
						bool on_border = false;
						for (int x = i - 1; x <= i + 1; x++) {
							for (int y = j - 1; y <= j + 1; y++) {
								if (x < 0 || y < 0 || x >= s.width || y >= s.height || r[(y * s.width + x) * 4 + 3] <= 128) {
									on_border = true;
									break;
								}
							}

							if (on_border) {
								break;
							}
						}

						if (on_border) {
							valid_positions.write[vpc] = Point2(i, j);

							if (emode == EMISSION_MODE_BORDER_DIRECTED) {
								Vector2 normal;
								for (int x = i - 2; x <= i + 2; x++) {
									for (int y = j - 2; y <= j + 2; y++) {
										if (x == i && y == j) {
											continue;
										}

										if (x < 0 || y < 0 || x >= s.width || y >= s.height || r[(y * s.width + x) * 4 + 3] <= 128) {
											normal += Vector2(x - i, y - j).normalized();
										}
									}
								}

								normal.normalize();
								valid_normals.write[vpc] = normal;
							}

							if (capture_colors) {
								valid_colors.write[vpc * 4 + 0] = r[(j * s.width + i) * 4 + 0];
								valid_colors.write[vpc * 4 + 1] = r[(j * s.width + i) * 4 + 1];
								valid_colors.write[vpc * 4 + 2] = r[(j * s.width + i) * 4 + 2];
								valid_colors.write[vpc * 4 + 3] = r[(j * s.width + i) * 4 + 3];
							}

							vpc++;
						}
					}
				}
			}
		}
	}

	valid_positions.resize(vpc);
	if (valid_normals.size()) {
		valid_normals.resize(vpc);
	}

	ERR_FAIL_COND_MSG(valid_positions.size() == 0, "No pixels with transparency > 128 in image...");

	Vector<uint8_t> texdata;

	int w = 2048;
	int h = (vpc / 2048) + 1;

	texdata.resize(w * h * 2 * sizeof(float));

	{
		uint8_t *tw = texdata.ptrw();
		float *twf = (float *)tw;
		for (int i = 0; i < vpc; i++) {
			twf[i * 2 + 0] = valid_positions[i].x;
			twf[i * 2 + 1] = valid_positions[i].y;
		}
	}

	img.instantiate();
	img->create(w, h, false, Image::FORMAT_RGF, texdata);

	Ref<ImageTexture> imgt;
	imgt.instantiate();
	imgt->create_from_image(img);

	pm->set_emission_point_texture(imgt);
	pm->set_emission_point_count(vpc);

	if (capture_colors) {
		Vector<uint8_t> colordata;
		colordata.resize(w * h * 4); //use RG texture

		{
			uint8_t *tw = colordata.ptrw();
			for (int i = 0; i < vpc * 4; i++) {
				tw[i] = valid_colors[i];
			}
		}

		img.instantiate();
		img->create(w, h, false, Image::FORMAT_RGBA8, colordata);

		imgt.instantiate();
		imgt->create_from_image(img);
		pm->set_emission_color_texture(imgt);
	}

	if (valid_normals.size()) {
		pm->set_emission_shape(ParticlesMaterial::EMISSION_SHAPE_DIRECTED_POINTS);

		Vector<uint8_t> normdata;
		normdata.resize(w * h * 2 * sizeof(float)); //use RG texture

		{
			uint8_t *tw = normdata.ptrw();
			float *twf = (float *)tw;
			for (int i = 0; i < vpc; i++) {
				twf[i * 2 + 0] = valid_normals[i].x;
				twf[i * 2 + 1] = valid_normals[i].y;
			}
		}

		img.instantiate();
		img->create(w, h, false, Image::FORMAT_RGF, normdata);

		imgt.instantiate();
		imgt->create_from_image(img);
		pm->set_emission_normal_texture(imgt);

	} else {
		pm->set_emission_shape(ParticlesMaterial::EMISSION_SHAPE_POINTS);
	}
}

void GPUParticles2DEditorPlugin::_notification(int p_what) {
	if (p_what == NOTIFICATION_ENTER_TREE) {
		menu->get_popup()->connect("id_pressed", callable_mp(this, &GPUParticles2DEditorPlugin::_menu_callback));
		menu->set_icon(menu->get_theme_icon(SNAME("GPUParticles2D"), SNAME("EditorIcons")));
		file->connect("file_selected", callable_mp(this, &GPUParticles2DEditorPlugin::_file_selected));
		EditorNode::get_singleton()->get_editor_selection()->connect("selection_changed", callable_mp(this, &GPUParticles2DEditorPlugin::_selection_changed));
	}
}

void GPUParticles2DEditorPlugin::_bind_methods() {
}

GPUParticles2DEditorPlugin::GPUParticles2DEditorPlugin(EditorNode *p_node) {
	particles = nullptr;
	editor = p_node;
	undo_redo = editor->get_undo_redo();

	toolbar = memnew(HBoxContainer);
	add_control_to_container(CONTAINER_CANVAS_EDITOR_MENU, toolbar);
	toolbar->hide();

	toolbar->add_child(memnew(VSeparator));

	menu = memnew(MenuButton);
	menu->get_popup()->add_item(TTR("Restart"), MENU_RESTART);
	menu->get_popup()->add_item(TTR("Generate Visibility Rect"), MENU_GENERATE_VISIBILITY_RECT);
	menu->get_popup()->add_item(TTR("Load Emission Mask"), MENU_LOAD_EMISSION_MASK);
	//	menu->get_popup()->add_item(TTR("Clear Emission Mask"), MENU_CLEAR_EMISSION_MASK);
	menu->get_popup()->add_item(TTR("Convert to CPUParticles2D"), MENU_OPTION_CONVERT_TO_CPU_PARTICLES);
	menu->set_text(TTR("GPUParticles2D"));
	menu->set_switch_on_hover(true);
	toolbar->add_child(menu);

	file = memnew(EditorFileDialog);
	List<String> ext;
	ImageLoader::get_recognized_extensions(&ext);
	for (const String &E : ext) {
		file->add_filter("*." + E + "; " + E.to_upper());
	}
	file->set_file_mode(EditorFileDialog::FILE_MODE_OPEN_FILE);
	toolbar->add_child(file);

	epoints = memnew(SpinBox);
	epoints->set_min(1);
	epoints->set_max(8192);
	epoints->set_step(1);
	epoints->set_value(512);
	file->get_vbox()->add_margin_child(TTR("Generated Point Count:"), epoints);

	generate_visibility_rect = memnew(ConfirmationDialog);
	generate_visibility_rect->set_title(TTR("Generate Visibility Rect"));
	VBoxContainer *genvb = memnew(VBoxContainer);
	generate_visibility_rect->add_child(genvb);
	generate_seconds = memnew(SpinBox);
	genvb->add_margin_child(TTR("Generation Time (sec):"), generate_seconds);
	generate_seconds->set_min(0.1);
	generate_seconds->set_max(25);
	generate_seconds->set_value(2);

	toolbar->add_child(generate_visibility_rect);

	generate_visibility_rect->connect("confirmed", callable_mp(this, &GPUParticles2DEditorPlugin::_generate_visibility_rect));

	emission_mask = memnew(ConfirmationDialog);
	emission_mask->set_title(TTR("Load Emission Mask"));
	VBoxContainer *emvb = memnew(VBoxContainer);
	emission_mask->add_child(emvb);
	emission_mask_mode = memnew(OptionButton);
	emvb->add_margin_child(TTR("Emission Mask"), emission_mask_mode);
	emission_mask_mode->add_item(TTR("Solid Pixels"), EMISSION_MODE_SOLID);
	emission_mask_mode->add_item(TTR("Border Pixels"), EMISSION_MODE_BORDER);
	emission_mask_mode->add_item(TTR("Directed Border Pixels"), EMISSION_MODE_BORDER_DIRECTED);
	emission_colors = memnew(CheckBox);
	emission_colors->set_text(TTR("Capture from Pixel"));
	emvb->add_margin_child(TTR("Emission Colors"), emission_colors);

	toolbar->add_child(emission_mask);

	emission_mask->connect("confirmed", callable_mp(this, &GPUParticles2DEditorPlugin::_generate_emission_mask));
}

GPUParticles2DEditorPlugin::~GPUParticles2DEditorPlugin() {
}