/**************************************************************************/
/*  lightmap_gi_editor_plugin.cpp                                         */
/**************************************************************************/
/*                         This file is part of:                          */
/*                             GODOT ENGINE                               */
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
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#include "lightmap_gi_editor_plugin.h"

#include "editor/editor_node.h"
#include "editor/editor_string_names.h"
#include "editor/gui/editor_file_dialog.h"

void LightmapGIEditorPlugin::_bake_select_file(const String &p_file) {
	if (lightmap) {
		LightmapGI::BakeError err = LightmapGI::BAKE_ERROR_OK;
		const uint64_t time_started = OS::get_singleton()->get_ticks_msec();
		if (get_tree()->get_edited_scene_root()) {
			Ref<LightmapGIData> lightmapGIData = lightmap->get_light_data();

			if (lightmapGIData.is_valid()) {
				String path = lightmapGIData->get_path();
				if (!path.is_resource_file()) {
					int srpos = path.find("::");
					if (srpos != -1) {
						String base = path.substr(0, srpos);
						if (ResourceLoader::get_resource_type(base) == "PackedScene") {
							if (!get_tree()->get_edited_scene_root() || get_tree()->get_edited_scene_root()->get_scene_file_path() != base) {
								err = LightmapGI::BAKE_ERROR_FOREIGN_DATA;
							}
						} else {
							if (FileAccess::exists(base + ".import")) {
								err = LightmapGI::BAKE_ERROR_FOREIGN_DATA;
							}
						}
					}
				} else {
					if (FileAccess::exists(path + ".import")) {
						err = LightmapGI::BAKE_ERROR_FOREIGN_DATA;
					}
				}
			}

			if (err == LightmapGI::BAKE_ERROR_OK) {
				if (get_tree()->get_edited_scene_root() == lightmap) {
					err = lightmap->bake(lightmap, p_file, bake_func_step);
				} else {
					err = lightmap->bake(lightmap->get_parent(), p_file, bake_func_step);
				}
			}
		} else {
			err = LightmapGI::BAKE_ERROR_NO_SCENE_ROOT;
		}

		bake_func_end(time_started);

		switch (err) {
			case LightmapGI::BAKE_ERROR_NO_SAVE_PATH: {
				String scene_path = lightmap->get_scene_file_path();
				if (scene_path.is_empty() && lightmap->get_owner()) {
					scene_path = lightmap->get_owner()->get_scene_file_path();
				}
				if (scene_path.is_empty()) {
					EditorNode::get_singleton()->show_warning(TTR("Can't determine a save path for lightmap images.\nSave your scene and try again."));
					break;
				}
				scene_path = scene_path.get_basename() + ".lmbake";

				file_dialog->set_current_path(scene_path);
				file_dialog->popup_file_dialog();
			} break;
			case LightmapGI::BAKE_ERROR_NO_MESHES: {
				EditorNode::get_singleton()->show_warning(TTR("No meshes to bake. Make sure they contain an UV2 channel and that the 'Bake Light' flag is on."));
			} break;
			case LightmapGI::BAKE_ERROR_CANT_CREATE_IMAGE: {
				EditorNode::get_singleton()->show_warning(TTR("Failed creating lightmap images, make sure path is writable."));
			} break;
			case LightmapGI::BAKE_ERROR_NO_SCENE_ROOT: {
				EditorNode::get_singleton()->show_warning(TTR("No editor scene root found."));
			} break;
			case LightmapGI::BAKE_ERROR_FOREIGN_DATA: {
				EditorNode::get_singleton()->show_warning(TTR("Lightmap data is not local to the scene."));
			} break;
			case LightmapGI::BAKE_ERROR_TEXTURE_SIZE_TOO_SMALL: {
				EditorNode::get_singleton()->show_warning(TTR("Maximum texture size is too small for the lightmap images."));
			} break;
			case LightmapGI::BAKE_ERROR_LIGHTMAP_TOO_SMALL: {
				EditorNode::get_singleton()->show_warning(TTR("Failed creating lightmap images. Make sure all meshes selected to bake have `lightmap_size_hint` value set high enough, and `texel_scale` value of LightmapGI is not too low."));
			} break;
			default: {
			} break;
		}
	}
}

void LightmapGIEditorPlugin::_bake() {
	_bake_select_file("");
}

void LightmapGIEditorPlugin::edit(Object *p_object) {
	LightmapGI *s = Object::cast_to<LightmapGI>(p_object);
	if (!s) {
		return;
	}

	lightmap = s;
}

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

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

EditorProgress *LightmapGIEditorPlugin::tmp_progress = nullptr;

bool LightmapGIEditorPlugin::bake_func_step(float p_progress, const String &p_description, void *, bool p_refresh) {
	if (!tmp_progress) {
		tmp_progress = memnew(EditorProgress("bake_lightmaps", TTR("Bake Lightmaps"), 1000, false));
		ERR_FAIL_NULL_V(tmp_progress, false);
	}
	return tmp_progress->step(p_description, p_progress * 1000, p_refresh);
}

void LightmapGIEditorPlugin::bake_func_end(uint64_t p_time_started) {
	if (tmp_progress != nullptr) {
		memdelete(tmp_progress);
		tmp_progress = nullptr;
	}

	const int time_taken = (OS::get_singleton()->get_ticks_msec() - p_time_started) * 0.001;
	print_line(vformat("Done baking lightmaps in %02d:%02d:%02d.", time_taken / 3600, (time_taken % 3600) / 60, time_taken % 60));
	// Request attention in case the user was doing something else.
	// Baking lightmaps is likely the editor task that can take the most time,
	// so only request the attention for baking lightmaps.
	DisplayServer::get_singleton()->window_request_attention();
}

void LightmapGIEditorPlugin::_bind_methods() {
	ClassDB::bind_method("_bake", &LightmapGIEditorPlugin::_bake);
}

LightmapGIEditorPlugin::LightmapGIEditorPlugin() {
	bake = memnew(Button);
	bake->set_theme_type_variation("FlatButton");
	// TODO: Rework this as a dedicated toolbar control so we can hook into theme changes and update it
	// when the editor theme updates.
	bake->set_icon(EditorNode::get_singleton()->get_editor_theme()->get_icon(SNAME("Bake"), EditorStringName(EditorIcons)));
	bake->set_text(TTR("Bake Lightmaps"));
	bake->hide();
	bake->connect("pressed", Callable(this, "_bake"));
	add_control_to_container(CONTAINER_SPATIAL_EDITOR_MENU, bake);
	lightmap = nullptr;

	file_dialog = memnew(EditorFileDialog);
	file_dialog->set_file_mode(EditorFileDialog::FILE_MODE_SAVE_FILE);
	file_dialog->add_filter("*.lmbake", TTR("LightMap Bake"));
	file_dialog->set_title(TTR("Select lightmap bake file:"));
	file_dialog->connect("file_selected", callable_mp(this, &LightmapGIEditorPlugin::_bake_select_file));
	bake->add_child(file_dialog);
}

LightmapGIEditorPlugin::~LightmapGIEditorPlugin() {
}