/**************************************************************************/
/*  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.\nWhile this can be fixed by increasing the maximum texture size, it is recommended you split the scene into more objects instead."));
			} 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() {
}