/*************************************************************************/
/*  resource_loader.cpp                                                  */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
/*************************************************************************/
/* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2018 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 "resource_loader.h"

#include "core/io/resource_import.h"
#include "core/os/file_access.h"
#include "core/os/os.h"
#include "core/path_remap.h"
#include "core/print_string.h"
#include "core/project_settings.h"
#include "core/translation.h"
#include "core/variant_parser.h"

ResourceFormatLoader *ResourceLoader::loader[MAX_LOADERS];

int ResourceLoader::loader_count = 0;

Error ResourceInteractiveLoader::wait() {

	Error err = poll();
	while (err == OK) {
		err = poll();
	}

	return err;
}

bool ResourceFormatLoader::recognize_path(const String &p_path, const String &p_for_type) const {

	String extension = p_path.get_extension();

	List<String> extensions;
	if (p_for_type == String()) {
		get_recognized_extensions(&extensions);
	} else {
		get_recognized_extensions_for_type(p_for_type, &extensions);
	}

	for (List<String>::Element *E = extensions.front(); E; E = E->next()) {

		if (E->get().nocasecmp_to(extension) == 0)
			return true;
	}

	return false;
}

void ResourceFormatLoader::get_recognized_extensions_for_type(const String &p_type, List<String> *p_extensions) const {

	if (p_type == "" || handles_type(p_type))
		get_recognized_extensions(p_extensions);
}

void ResourceLoader::get_recognized_extensions_for_type(const String &p_type, List<String> *p_extensions) {

	for (int i = 0; i < loader_count; i++) {
		loader[i]->get_recognized_extensions_for_type(p_type, p_extensions);
	}
}

void ResourceInteractiveLoader::_bind_methods() {

	ClassDB::bind_method(D_METHOD("get_resource"), &ResourceInteractiveLoader::get_resource);
	ClassDB::bind_method(D_METHOD("poll"), &ResourceInteractiveLoader::poll);
	ClassDB::bind_method(D_METHOD("wait"), &ResourceInteractiveLoader::wait);
	ClassDB::bind_method(D_METHOD("get_stage"), &ResourceInteractiveLoader::get_stage);
	ClassDB::bind_method(D_METHOD("get_stage_count"), &ResourceInteractiveLoader::get_stage_count);
}

class ResourceInteractiveLoaderDefault : public ResourceInteractiveLoader {

	GDCLASS(ResourceInteractiveLoaderDefault, ResourceInteractiveLoader);

public:
	Ref<Resource> resource;

	virtual void set_local_path(const String &p_local_path) { /*scene->set_filename(p_local_path);*/
	}
	virtual Ref<Resource> get_resource() { return resource; }
	virtual Error poll() { return ERR_FILE_EOF; }
	virtual int get_stage() const { return 1; }
	virtual int get_stage_count() const { return 1; }
	virtual void set_translation_remapped(bool p_remapped) { resource->set_as_translation_remapped(p_remapped); }

	ResourceInteractiveLoaderDefault() {}
};

Ref<ResourceInteractiveLoader> ResourceFormatLoader::load_interactive(const String &p_path, const String &p_original_path, Error *r_error) {

	//either this
	Ref<Resource> res = load(p_path, p_original_path, r_error);
	if (res.is_null())
		return Ref<ResourceInteractiveLoader>();

	Ref<ResourceInteractiveLoaderDefault> ril = Ref<ResourceInteractiveLoaderDefault>(memnew(ResourceInteractiveLoaderDefault));
	ril->resource = res;
	return ril;
}

bool ResourceFormatLoader::exists(const String &p_path) const {
	return FileAccess::exists(p_path); //by default just check file
}

RES ResourceFormatLoader::load(const String &p_path, const String &p_original_path, Error *r_error) {

	String path = p_path;

	//or this must be implemented
	Ref<ResourceInteractiveLoader> ril = load_interactive(p_path, p_original_path, r_error);
	if (!ril.is_valid())
		return RES();
	ril->set_local_path(p_original_path);

	while (true) {

		Error err = ril->poll();

		if (err == ERR_FILE_EOF) {
			if (r_error)
				*r_error = OK;
			return ril->get_resource();
		}

		if (r_error)
			*r_error = err;

		ERR_FAIL_COND_V(err != OK, RES());
	}

	return RES();
}

void ResourceFormatLoader::get_dependencies(const String &p_path, List<String> *p_dependencies, bool p_add_types) {

	//do nothing by default
}

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

RES ResourceLoader::_load(const String &p_path, const String &p_original_path, const String &p_type_hint, bool p_no_cache, Error *r_error) {

	bool found = false;

	// Try all loaders and pick the first match for the type hint
	for (int i = 0; i < loader_count; i++) {

		if (!loader[i]->recognize_path(p_path, p_type_hint)) {
			continue;
		}
		found = true;
		RES res = loader[i]->load(p_path, p_original_path != String() ? p_original_path : p_path, r_error);
		if (res.is_null()) {
			continue;
		}

		return res;
	}

	if (found) {
		ERR_EXPLAIN("Failed loading resource: " + p_path);
	} else {
		ERR_EXPLAIN("No loader found for resource: " + p_path);
	}
	ERR_FAIL_V(RES());
	return RES();
}

RES ResourceLoader::load(const String &p_path, const String &p_type_hint, bool p_no_cache, Error *r_error) {

	if (r_error)
		*r_error = ERR_CANT_OPEN;

	String local_path;
	if (p_path.is_rel_path())
		local_path = "res://" + p_path;
	else
		local_path = ProjectSettings::get_singleton()->localize_path(p_path);

	if (!p_no_cache) {
		//lock first if possible
		if (ResourceCache::lock) {
			ResourceCache::lock->read_lock();
		}

		//get ptr
		Resource **rptr = ResourceCache::resources.getptr(local_path);

		if (rptr) {
			RES res(*rptr);
			//it is possible this resource was just freed in a thread. If so, this referencing will not work and resource is considered not cached
			if (res.is_valid()) {
				//referencing is fine
				if (r_error)
					*r_error = OK;
				if (ResourceCache::lock) {
					ResourceCache::lock->read_unlock();
				}
				print_verbose("Loading resource: " + local_path + " (cached)");
				return res;
			}
		}
		if (ResourceCache::lock) {
			ResourceCache::lock->read_unlock();
		}
	}

	bool xl_remapped = false;
	String path = _path_remap(local_path, &xl_remapped);

	ERR_FAIL_COND_V(path == "", RES());

	print_verbose("Loading resource: " + path);
	RES res = _load(path, local_path, p_type_hint, p_no_cache, r_error);

	if (res.is_null()) {
		return RES();
	}
	if (!p_no_cache)
		res->set_path(local_path);

	if (xl_remapped)
		res->set_as_translation_remapped(true);

#ifdef TOOLS_ENABLED

	res->set_edited(false);
	if (timestamp_on_load) {
		uint64_t mt = FileAccess::get_modified_time(path);
		//printf("mt %s: %lli\n",remapped_path.utf8().get_data(),mt);
		res->set_last_modified_time(mt);
	}
#endif

	return res;
}

bool ResourceLoader::exists(const String &p_path, const String &p_type_hint) {

	String local_path;
	if (p_path.is_rel_path())
		local_path = "res://" + p_path;
	else
		local_path = ProjectSettings::get_singleton()->localize_path(p_path);

	if (ResourceCache::has(local_path)) {

		return true; // If cached, it probably exists
	}

	bool xl_remapped = false;
	String path = _path_remap(local_path, &xl_remapped);

	// Try all loaders and pick the first match for the type hint
	for (int i = 0; i < loader_count; i++) {

		if (!loader[i]->recognize_path(path, p_type_hint)) {
			continue;
		}

		if (loader[i]->exists(path))
			return true;
	}

	return false;
}

Ref<ResourceInteractiveLoader> ResourceLoader::load_interactive(const String &p_path, const String &p_type_hint, bool p_no_cache, Error *r_error) {

	if (r_error)
		*r_error = ERR_CANT_OPEN;

	String local_path;
	if (p_path.is_rel_path())
		local_path = "res://" + p_path;
	else
		local_path = ProjectSettings::get_singleton()->localize_path(p_path);

	if (!p_no_cache && ResourceCache::has(local_path)) {

		print_verbose("Loading resource: " + local_path + " (cached)");
		Ref<Resource> res_cached = ResourceCache::get(local_path);
		Ref<ResourceInteractiveLoaderDefault> ril = Ref<ResourceInteractiveLoaderDefault>(memnew(ResourceInteractiveLoaderDefault));

		ril->resource = res_cached;
		return ril;
	}

	bool xl_remapped = false;
	String path = _path_remap(local_path, &xl_remapped);
	ERR_FAIL_COND_V(path == "", Ref<ResourceInteractiveLoader>());
	print_verbose("Loading resource: " + path);

	bool found = false;
	for (int i = 0; i < loader_count; i++) {

		if (!loader[i]->recognize_path(path, p_type_hint))
			continue;
		found = true;
		Ref<ResourceInteractiveLoader> ril = loader[i]->load_interactive(path, local_path, r_error);
		if (ril.is_null())
			continue;
		if (!p_no_cache)
			ril->set_local_path(local_path);
		if (xl_remapped)
			ril->set_translation_remapped(true);

		return ril;
	}

	if (found) {
		ERR_EXPLAIN("Failed loading resource: " + path);
	} else {
		ERR_EXPLAIN("No loader found for resource: " + path);
	}
	ERR_FAIL_V(Ref<ResourceInteractiveLoader>());
	return Ref<ResourceInteractiveLoader>();
}

void ResourceLoader::add_resource_format_loader(ResourceFormatLoader *p_format_loader, bool p_at_front) {

	ERR_FAIL_COND(loader_count >= MAX_LOADERS);
	if (p_at_front) {
		for (int i = loader_count; i > 0; i--) {
			loader[i] = loader[i - 1];
		}
		loader[0] = p_format_loader;
		loader_count++;
	} else {
		loader[loader_count++] = p_format_loader;
	}
}

int ResourceLoader::get_import_order(const String &p_path) {

	String path = _path_remap(p_path);

	String local_path;
	if (path.is_rel_path())
		local_path = "res://" + path;
	else
		local_path = ProjectSettings::get_singleton()->localize_path(path);

	for (int i = 0; i < loader_count; i++) {

		if (!loader[i]->recognize_path(local_path))
			continue;
		/*
		if (p_type_hint!="" && !loader[i]->handles_type(p_type_hint))
			continue;
		*/

		return loader[i]->get_import_order(p_path);
	}

	return 0;
}

bool ResourceLoader::is_import_valid(const String &p_path) {

	String path = _path_remap(p_path);

	String local_path;
	if (path.is_rel_path())
		local_path = "res://" + path;
	else
		local_path = ProjectSettings::get_singleton()->localize_path(path);

	for (int i = 0; i < loader_count; i++) {

		if (!loader[i]->recognize_path(local_path))
			continue;
		/*
		if (p_type_hint!="" && !loader[i]->handles_type(p_type_hint))
			continue;
		*/

		return loader[i]->is_import_valid(p_path);
	}

	return false; //not found
}

void ResourceLoader::get_dependencies(const String &p_path, List<String> *p_dependencies, bool p_add_types) {

	String path = _path_remap(p_path);

	String local_path;
	if (path.is_rel_path())
		local_path = "res://" + path;
	else
		local_path = ProjectSettings::get_singleton()->localize_path(path);

	for (int i = 0; i < loader_count; i++) {

		if (!loader[i]->recognize_path(local_path))
			continue;
		/*
		if (p_type_hint!="" && !loader[i]->handles_type(p_type_hint))
			continue;
		*/

		loader[i]->get_dependencies(local_path, p_dependencies, p_add_types);
	}
}

Error ResourceLoader::rename_dependencies(const String &p_path, const Map<String, String> &p_map) {

	String path = _path_remap(p_path);

	String local_path;
	if (path.is_rel_path())
		local_path = "res://" + path;
	else
		local_path = ProjectSettings::get_singleton()->localize_path(path);

	for (int i = 0; i < loader_count; i++) {

		if (!loader[i]->recognize_path(local_path))
			continue;
		/*
		if (p_type_hint!="" && !loader[i]->handles_type(p_type_hint))
			continue;
		*/

		return loader[i]->rename_dependencies(local_path, p_map);
	}

	return OK; // ??
}

String ResourceLoader::get_resource_type(const String &p_path) {

	String local_path;
	if (p_path.is_rel_path())
		local_path = "res://" + p_path;
	else
		local_path = ProjectSettings::get_singleton()->localize_path(p_path);

	for (int i = 0; i < loader_count; i++) {

		String result = loader[i]->get_resource_type(local_path);
		if (result != "")
			return result;
	}

	return "";
}

String ResourceLoader::_path_remap(const String &p_path, bool *r_translation_remapped) {

	String new_path = p_path;

	if (translation_remaps.has(new_path)) {

		Vector<String> &v = *translation_remaps.getptr(new_path);
		String locale = TranslationServer::get_singleton()->get_locale();
		if (r_translation_remapped) {
			*r_translation_remapped = true;
		}
		for (int i = 0; i < v.size(); i++) {

			int split = v[i].find_last(":");
			if (split == -1)
				continue;
			String l = v[i].right(split + 1).strip_edges();
			if (l == String())
				continue;

			if (l.begins_with(locale)) {
				new_path = v[i].left(split);
				break;
			}
		}
	}

	if (path_remaps.has(new_path)) {
		new_path = path_remaps[new_path];
	}

	if (new_path == p_path) { //did not remap
		//try file remap
		Error err;
		FileAccess *f = FileAccess::open(p_path + ".remap", FileAccess::READ, &err);

		if (f) {

			VariantParser::StreamFile stream;
			stream.f = f;

			String assign;
			Variant value;
			VariantParser::Tag next_tag;

			int lines = 0;
			String error_text;
			while (true) {

				assign = Variant();
				next_tag.fields.clear();
				next_tag.name = String();

				err = VariantParser::parse_tag_assign_eof(&stream, lines, error_text, next_tag, assign, value, NULL, true);
				if (err == ERR_FILE_EOF) {
					break;
				} else if (err != OK) {
					ERR_PRINTS("Parse error: " + p_path + ".remap:" + itos(lines) + " error: " + error_text);
					break;
				}

				if (assign == "path") {
					new_path = value;
					break;
				} else if (next_tag.name != "remap") {
					break;
				}
			}

			memdelete(f);
		}
	}

	return new_path;
}

String ResourceLoader::import_remap(const String &p_path) {

	if (ResourceFormatImporter::get_singleton()->recognize_path(p_path)) {

		return ResourceFormatImporter::get_singleton()->get_internal_resource_path(p_path);
	}

	return p_path;
}

String ResourceLoader::path_remap(const String &p_path) {
	return _path_remap(p_path);
}

void ResourceLoader::reload_translation_remaps() {

	if (ResourceCache::lock) {
		ResourceCache::lock->read_lock();
	}

	List<Resource *> to_reload;
	SelfList<Resource> *E = remapped_list.first();

	while (E) {
		to_reload.push_back(E->self());
		E = E->next();
	}

	if (ResourceCache::lock) {
		ResourceCache::lock->read_unlock();
	}

	//now just make sure to not delete any of these resources while changing locale..
	while (to_reload.front()) {
		to_reload.front()->get()->reload_from_file();
		to_reload.pop_front();
	}
}

void ResourceLoader::load_translation_remaps() {

	if (!ProjectSettings::get_singleton()->has_setting("locale/translation_remaps"))
		return;

	Dictionary remaps = ProjectSettings::get_singleton()->get("locale/translation_remaps");
	List<Variant> keys;
	remaps.get_key_list(&keys);
	for (List<Variant>::Element *E = keys.front(); E; E = E->next()) {

		Array langs = remaps[E->get()];
		Vector<String> lang_remaps;
		lang_remaps.resize(langs.size());
		for (int i = 0; i < langs.size(); i++) {
			lang_remaps.write[i] = langs[i];
		}

		translation_remaps[String(E->get())] = lang_remaps;
	}
}

void ResourceLoader::clear_translation_remaps() {
	translation_remaps.clear();
}

void ResourceLoader::load_path_remaps() {

	if (!ProjectSettings::get_singleton()->has_setting("path_remap/remapped_paths"))
		return;

	PoolVector<String> remaps = ProjectSettings::get_singleton()->get("path_remap/remapped_paths");
	int rc = remaps.size();
	ERR_FAIL_COND(rc & 1); //must be even
	PoolVector<String>::Read r = remaps.read();

	for (int i = 0; i < rc; i += 2) {

		path_remaps[r[i]] = r[i + 1];
	}
}

void ResourceLoader::clear_path_remaps() {

	path_remaps.clear();
}

ResourceLoadErrorNotify ResourceLoader::err_notify = NULL;
void *ResourceLoader::err_notify_ud = NULL;

DependencyErrorNotify ResourceLoader::dep_err_notify = NULL;
void *ResourceLoader::dep_err_notify_ud = NULL;

bool ResourceLoader::abort_on_missing_resource = true;
bool ResourceLoader::timestamp_on_load = false;

SelfList<Resource>::List ResourceLoader::remapped_list;
HashMap<String, Vector<String> > ResourceLoader::translation_remaps;
HashMap<String, String> ResourceLoader::path_remaps;