/**************************************************************************/
/*  resource_format_binary.h                                              */
/**************************************************************************/
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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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#ifndef RESOURCE_FORMAT_BINARY_H
#define RESOURCE_FORMAT_BINARY_H

#include "core/io/file_access.h"
#include "core/io/resource_loader.h"
#include "core/io/resource_saver.h"

class ResourceLoaderBinary {
	bool translation_remapped = false;
	String local_path;
	String res_path;
	String type;
	Ref<Resource> resource;
	uint32_t ver_format = 0;

	Ref<FileAccess> f;

	uint64_t importmd_ofs = 0;

	ResourceUID::ID uid = ResourceUID::INVALID_ID;

	Vector<char> str_buf;
	List<Ref<Resource>> resource_cache;

	Vector<StringName> string_map;

	StringName _get_string();

	struct ExtResource {
		String path;
		String type;
		ResourceUID::ID uid = ResourceUID::INVALID_ID;
		Ref<ResourceLoader::LoadToken> load_token;
	};

	bool using_named_scene_ids = false;
	bool using_uids = false;
	String script_class;
	bool use_sub_threads = false;
	float *progress = nullptr;
	Vector<ExtResource> external_resources;

	struct IntResource {
		String path;
		uint64_t offset;
	};

	Vector<IntResource> internal_resources;
	HashMap<String, Ref<Resource>> internal_index_cache;

	String get_unicode_string();
	void _advance_padding(uint32_t p_len);

	HashMap<String, String> remaps;
	Error error = OK;

	ResourceFormatLoader::CacheMode cache_mode = ResourceFormatLoader::CACHE_MODE_REUSE;

	friend class ResourceFormatLoaderBinary;

	Error parse_variant(Variant &r_v);

	HashMap<String, Ref<Resource>> dependency_cache;

public:
	Ref<Resource> get_resource();
	Error load();
	void set_translation_remapped(bool p_remapped);

	void set_remaps(const HashMap<String, String> &p_remaps) { remaps = p_remaps; }
	void open(Ref<FileAccess> p_f, bool p_no_resources = false, bool p_keep_uuid_paths = false);
	String recognize(Ref<FileAccess> p_f);
	String recognize_script_class(Ref<FileAccess> p_f);
	void get_dependencies(Ref<FileAccess> p_f, List<String> *p_dependencies, bool p_add_types);
	void get_classes_used(Ref<FileAccess> p_f, HashSet<StringName> *p_classes);

	ResourceLoaderBinary() {}
};

class ResourceFormatLoaderBinary : public ResourceFormatLoader {
public:
	virtual Ref<Resource> load(const String &p_path, const String &p_original_path = "", Error *r_error = nullptr, bool p_use_sub_threads = false, float *r_progress = nullptr, CacheMode p_cache_mode = CACHE_MODE_REUSE);
	virtual void get_recognized_extensions_for_type(const String &p_type, List<String> *p_extensions) const;
	virtual void get_recognized_extensions(List<String> *p_extensions) const;
	virtual bool handles_type(const String &p_type) const;
	virtual String get_resource_type(const String &p_path) const;
	virtual String get_resource_script_class(const String &p_path) const;
	virtual void get_classes_used(const String &p_path, HashSet<StringName> *r_classes);
	virtual ResourceUID::ID get_resource_uid(const String &p_path) const;
	virtual void get_dependencies(const String &p_path, List<String> *p_dependencies, bool p_add_types = false);
	virtual Error rename_dependencies(const String &p_path, const HashMap<String, String> &p_map);
};

class ResourceFormatSaverBinaryInstance {
	String local_path;
	String path;

	bool relative_paths;
	bool bundle_resources;
	bool skip_editor;
	bool big_endian;
	bool takeover_paths;
	String magic;
	HashSet<Ref<Resource>> resource_set;

	struct NonPersistentKey { //for resource properties generated on the fly
		Ref<Resource> base;
		StringName property;
		bool operator<(const NonPersistentKey &p_key) const { return base == p_key.base ? property < p_key.property : base < p_key.base; }
	};

	RBMap<NonPersistentKey, Ref<Resource>> non_persistent_map;
	HashMap<StringName, int> string_map;
	Vector<StringName> strings;

	HashMap<Ref<Resource>, int> external_resources;
	List<Ref<Resource>> saved_resources;

	struct Property {
		int name_idx;
		Variant value;
		PropertyInfo pi;
	};

	struct ResourceData {
		String type;
		List<Property> properties;
	};

	static void _pad_buffer(Ref<FileAccess> f, int p_bytes);
	void _find_resources(const Variant &p_variant, bool p_main = false);
	static void save_unicode_string(Ref<FileAccess> f, const String &p_string, bool p_bit_on_len = false);
	int get_string_index(const String &p_string);

public:
	enum {
		FORMAT_FLAG_NAMED_SCENE_IDS = 1,
		FORMAT_FLAG_UIDS = 2,
		FORMAT_FLAG_REAL_T_IS_DOUBLE = 4,
		FORMAT_FLAG_HAS_SCRIPT_CLASS = 8,

		// Amount of reserved 32-bit fields in resource header
		RESERVED_FIELDS = 11
	};
	Error save(const String &p_path, const Ref<Resource> &p_resource, uint32_t p_flags = 0);
	Error set_uid(const String &p_path, ResourceUID::ID p_uid);
	static void write_variant(Ref<FileAccess> f, const Variant &p_property, HashMap<Ref<Resource>, int> &resource_map, HashMap<Ref<Resource>, int> &external_resources, HashMap<StringName, int> &string_map, const PropertyInfo &p_hint = PropertyInfo());
};

class ResourceFormatSaverBinary : public ResourceFormatSaver {
public:
	static ResourceFormatSaverBinary *singleton;
	virtual Error save(const Ref<Resource> &p_resource, const String &p_path, uint32_t p_flags = 0);
	virtual Error set_uid(const String &p_path, ResourceUID::ID p_uid);
	virtual bool recognize(const Ref<Resource> &p_resource) const;
	virtual void get_recognized_extensions(const Ref<Resource> &p_resource, List<String> *p_extensions) const;

	ResourceFormatSaverBinary();
};

#endif // RESOURCE_FORMAT_BINARY_H