/* $Id$ */

/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */

/** @file newgrf_config.h Functions to find and configure NewGRFs. */

#ifndef NEWGRF_CONFIG_H
#define NEWGRF_CONFIG_H

#include "strings_type.h"
#include "core/alloc_type.hpp"

/** GRF config bit flags */
enum GCF_Flags {
	GCF_SYSTEM,     ///< GRF file is an openttd-internal system grf
	GCF_UNSAFE,     ///< GRF file is unsafe for static usage
	GCF_STATIC,     ///< GRF file is used statically (can be used in any MP game)
	GCF_COMPATIBLE, ///< GRF file does not exactly match the requested GRF (different MD5SUM), but grfid matches)
	GCF_COPY,       ///< The data is copied from a grf in _all_grfs
	GCF_INIT_ONLY,  ///< GRF file is processed up to GLS_INIT
	GCF_RESERVED,   ///< GRF file passed GLS_RESERVE stage

};

/** Status of GRF */
enum GRFStatus {
	GCS_UNKNOWN,      ///< The status of this grf file is unknown
	GCS_DISABLED,     ///< GRF file is disabled
	GCS_NOT_FOUND,    ///< GRF file was not found in the local cache
	GCS_INITIALISED,  ///< GRF file has been initialised
	GCS_ACTIVATED     ///< GRF file has been activated
};

/** Encountered GRF bugs */
enum GRFBugs {
	GBUG_VEH_LENGTH,  ///< Length of rail vehicle changes when not inside a depot
	GBUG_VEH_REFIT,   ///< Articulated vehicles carry different cargos resp. are differently refittable than specified in purchase list
};

/** Status of post-gameload GRF compatibility check */
enum GRFListCompatibility {
	GLC_ALL_GOOD,   ///< All GRF needed by game are present
	GLC_COMPATIBLE, ///< Compatible (eg. the same ID, but different chacksum) GRF found in at least one case
	GLC_NOT_FOUND   ///< At least one GRF couldn't be found (higher priority than GLC_COMPATIBLE)
};

/** Basic data to distinguish a GRF. Used in the server list window */
struct GRFIdentifier {
	uint32 grfid;     ///< GRF ID (defined by Action 0x08)
	uint8 md5sum[16]; ///< MD5 checksum of file to distinguish files with the same GRF ID (eg. newer version of GRF)

	/** Does the identification match the provided values?
	 * @param grfid  Expected grfid.
	 * @param md5sum Expected md5sum, may be \c NULL (in which case, do not check it).
	 * @return the object has the provided grfid and md5sum.
	 */
	FORCEINLINE bool HasGrfIdentifier(uint32 grfid, const uint8 *md5sum) const
	{
		if (this->grfid != grfid) return false;
		if (md5sum == NULL) return true;
		return memcmp(md5sum, this->md5sum, sizeof(this->md5sum)) == 0;
	}
};

/** Information about why GRF had problems during initialisation */
struct GRFError : ZeroedMemoryAllocator {
	GRFError(StringID severity, StringID message = 0);
	~GRFError();

	char *custom_message;  ///< Custom message (if present)
	char *data;            ///< Additional data for message and custom_message
	StringID message;      ///< Default message
	StringID severity;     ///< Info / Warning / Error / Fatal
	uint8 num_params;      ///< Number of additinal parameters for message and custom_message (0, 1 or 2)
	uint32 param_value[2]; ///< Values of GRF parameters to show for message and custom_message
};

/** Information about GRF, used in the game and (part of it) in savegames */
struct GRFConfig : ZeroedMemoryAllocator {
	GRFConfig(const char *filename = NULL);
	~GRFConfig();

	GRFIdentifier ident; ///< grfid and md5sum to uniquely identify newgrfs
	uint8 original_md5sum[16]; ///< MD5 checksum of original file if only a 'compatible' file was loaded
	char *filename;     ///< Filename - either with or without full path
	char *name;         ///< NOSAVE: GRF name (Action 0x08)
	char *info;         ///< NOSAVE: GRF info (author, copyright, ...) (Action 0x08)
	GRFError *error;    ///< NOSAVE: Error/Warning during GRF loading (Action 0x0B)

	uint8 flags;        ///< NOSAVE: GCF_Flags, bitset
	GRFStatus status;   ///< NOSAVE: GRFStatus, enum
	uint32 grf_bugs;    ///< NOSAVE: bugs in this GRF in this run, @see enum GRFBugs
	uint32 param[0x80]; ///< GRF parameters
	uint8 num_params;   ///< Number of used parameters
	bool windows_paletted;  ///< Whether the NewGRF is Windows paletted or not

	struct GRFConfig *next; ///< NOSAVE: Next item in the linked list

	bool IsOpenTTDBaseGRF() const;

	const char *GetName() const;
	const char *GetDescription() const;
};

extern GRFConfig *_all_grfs;          ///< First item in list of all scanned NewGRFs
extern GRFConfig *_grfconfig;         ///< First item in list of current GRF set up
extern GRFConfig *_grfconfig_newgame; ///< First item in list of default GRF set up
extern GRFConfig *_grfconfig_static;  ///< First item in list of static GRF set up

void ScanNewGRFFiles();
const GRFConfig *FindGRFConfig(uint32 grfid, const uint8 *md5sum = NULL);
GRFConfig *GetGRFConfig(uint32 grfid, uint32 mask = 0xFFFFFFFF);
GRFConfig **CopyGRFConfigList(GRFConfig **dst, const GRFConfig *src, bool init_only);
void AppendStaticGRFConfigs(GRFConfig **dst);
void AppendToGRFConfigList(GRFConfig **dst, GRFConfig *el);
void ClearGRFConfigList(GRFConfig **config);
void ResetGRFConfig(bool defaults);
GRFListCompatibility IsGoodGRFConfigList(GRFConfig *grfconfig);
bool FillGRFDetails(GRFConfig *config, bool is_static);
char *GRFBuildParamList(char *dst, const GRFConfig *c, const char *last);
GRFConfig *DuplicateGRFConfig(const GRFConfig *c);

/* In newgrf_gui.cpp */
void ShowNewGRFSettings(bool editable, bool show_params, bool exec_changes, GRFConfig **config);

#ifdef ENABLE_NETWORK
/* For communication about GRFs over the network */
#define UNKNOWN_GRF_NAME_PLACEHOLDER "<Unknown>"
char *FindUnknownGRFName(uint32 grfid, uint8 *md5sum, bool create);
#endif /* ENABLE_NETWORK */

#endif /* NEWGRF_CONFIG_H */