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/* $Id$ */

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#ifndef SAVELOAD_H

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#define SAVELOAD_H

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typedef enum SaveOrLoadResult {

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	SL_OK     = 0, // completed successfully

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	SL_ERROR  = 1, // error that was caught before internal structures were modified

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	SL_REINIT = 2, // error that was caught in the middle of updating game state, need to clear it. (can only happen during load)

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} SaveOrLoadResult;

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typedef enum SaveOrLoadMode {

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	SL_INVALID  = -1,

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	SL_LOAD     =  0,

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	SL_SAVE     =  1,

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	SL_OLD_LOAD =  2,

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	SL_PNG      =  3,

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	SL_BMP      =  4,

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} SaveOrLoadMode;

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SaveOrLoadResult SaveOrLoad(const char *filename, int mode);

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void WaitTillSaved(void);

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void DoExitSave(void);

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typedef void ChunkSaveLoadProc(void);

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typedef void AutolengthProc(void *arg);

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typedef struct {

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	uint32 id;

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	ChunkSaveLoadProc *save_proc;

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	ChunkSaveLoadProc *load_proc;

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	uint32 flags;

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} ChunkHandler;

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typedef struct {

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	byte null;

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} NullStruct;

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typedef enum SLRefType {

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	REF_ORDER         = 0,

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	REF_VEHICLE       = 1,

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	REF_STATION       = 2,

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	REF_TOWN          = 3,

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	REF_VEHICLE_OLD   = 4,

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	REF_ROADSTOPS     = 5,

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	REF_ENGINE_RENEWS = 6,

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} SLRefType;

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#define SL_MAX_VERSION 255

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enum {

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	INC_VEHICLE_COMMON = 0,

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};

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enum {

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	CH_RIFF         =  0,

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	CH_ARRAY        =  1,

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	CH_SPARSE_ARRAY =  2,

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	CH_TYPE_MASK    =  3,

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	CH_LAST         =  8,

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	CH_AUTO_LENGTH  = 16,

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	CH_PRI_0          = 0 << 4,

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	CH_PRI_1          = 1 << 4,

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	CH_PRI_2          = 2 << 4,

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	CH_PRI_3          = 3 << 4,

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	CH_PRI_SHL        = 4,

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	CH_NUM_PRI_LEVELS = 4,

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};

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/** VarTypes is the general bitmasked magic type that tells us

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 * certain characteristics about the variable it refers to. For example

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 * SLE_FILE_* gives the size(type) as it would be in the savegame and

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 * SLE_VAR_* the size(type) as it is in memory during runtime. These are

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 * the first 8 bytes (0-3 SLE_FILE, 4-7 SLE_VAR).

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 * Bytes 8-15 are reserved for various flags as explained below */

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enum VarTypes {

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	/* 4 bytes allocated a maximum of 16 types for NumberType */

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	SLE_FILE_I8       = 0,

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	SLE_FILE_U8       = 1,

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	SLE_FILE_I16      = 2,

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	SLE_FILE_U16      = 3,

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	SLE_FILE_I32      = 4,

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	SLE_FILE_U32      = 5,

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	SLE_FILE_I64      = 6,

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	SLE_FILE_U64      = 7,

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	SLE_FILE_STRINGID = 8, ///< StringID offset into strings-array

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	SLE_FILE_STRING   = 9,

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	/* 6 more possible file-primitives */

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	/* 4 bytes allocated a maximum of 16 types for NumberType */

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	SLE_VAR_BL    =  0 << 4,

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	SLE_VAR_I8    =  1 << 4,

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	SLE_VAR_U8    =  2 << 4,

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	SLE_VAR_I16   =  3 << 4,

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	SLE_VAR_U16   =  4 << 4,

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	SLE_VAR_I32   =  5 << 4,

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	SLE_VAR_U32   =  6 << 4,

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	SLE_VAR_I64   =  7 << 4,

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	SLE_VAR_U64   =  8 << 4,

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	SLE_VAR_NULL  =  9 << 4, ///< useful to write zeros in savegame.

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	SLE_VAR_STRB  = 10 << 4, ///< string (with pre-allocated buffer)

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	SLE_VAR_STRBQ = 11 << 4, ///< string enclosed in quotes (with pre-allocated buffer)

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	SLE_VAR_STR   = 12 << 4, ///< string pointer

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	SLE_VAR_STRQ  = 13 << 4, ///< string pointer enclosed in quotes

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	/* 2 more possible memory-primitives */

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	/* Shortcut values */

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	SLE_VAR_CHAR = SLE_VAR_I8,

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	/* Default combinations of variables. As savegames change, so can variables

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	 * and thus it is possible that the saved value and internal size do not

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	 * match and you need to specify custom combo. The defaults are listed here */

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	SLE_BOOL         = SLE_FILE_I8  | SLE_VAR_BL,

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	SLE_INT8         = SLE_FILE_I8  | SLE_VAR_I8,

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	SLE_UINT8        = SLE_FILE_U8  | SLE_VAR_U8,

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	SLE_INT16        = SLE_FILE_I16 | SLE_VAR_I16,

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	SLE_UINT16       = SLE_FILE_U16 | SLE_VAR_U16,

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	SLE_INT32        = SLE_FILE_I32 | SLE_VAR_I32,

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	SLE_UINT32       = SLE_FILE_U32 | SLE_VAR_U32,

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	SLE_INT64        = SLE_FILE_I64 | SLE_VAR_I64,

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	SLE_UINT64       = SLE_FILE_U64 | SLE_VAR_U64,

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	SLE_CHAR         = SLE_FILE_I8  | SLE_VAR_CHAR,

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	SLE_STRINGID     = SLE_FILE_STRINGID | SLE_VAR_U16,

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	SLE_STRINGBUF    = SLE_FILE_STRING   | SLE_VAR_STRB,

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	SLE_STRINGBQUOTE = SLE_FILE_STRING   | SLE_VAR_STRBQ,

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	SLE_STRING       = SLE_FILE_STRING   | SLE_VAR_STR,

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	SLE_STRINGQUOTE  = SLE_FILE_STRING   | SLE_VAR_STRQ,

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	/* Shortcut values */

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	SLE_UINT  = SLE_UINT32,

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	SLE_INT   = SLE_INT32,

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	SLE_STRB  = SLE_STRINGBUF,

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	SLE_STRBQ = SLE_STRINGBQUOTE,

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	SLE_STR   = SLE_STRING,

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	SLE_STRQ  = SLE_STRINGQUOTE,

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	/* 8 bytes allocated for a maximum of 8 flags

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	 * Flags directing saving/loading of a variable */

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	SLF_SAVE_NO      = 1 <<  8, ///< do not save with savegame, basically player-based

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	SLF_CONFIG_NO    = 1 <<  9, ///< do not save to config file

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	SLF_NETWORK_NO   = 1 << 10, ///< do not synchronize over network (but it is saved if SSF_SAVE_NO is not set)

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	/* 5 more possible flags */

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};

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typedef uint32 VarType;

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enum SaveLoadTypes {

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	SL_VAR       =  0,

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	SL_REF       =  1,

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	SL_ARR       =  2,

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	SL_STR       =  3,

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	// non-normal save-load types

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	SL_WRITEBYTE =  8,

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	SL_INCLUDE   =  9,

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	SL_END       = 15

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};

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typedef byte SaveLoadType;

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/** SaveLoad type struct. Do NOT use this directly but use the SLE_ macros defined just below! */

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typedef struct SaveLoad {

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	SaveLoadType cmd;    ///< the action to take with the saved/loaded type, All types need different action

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	VarType conv;        ///< type of the variable to be saved, int

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	uint16 length;       ///< (conditional) length of the variable (eg. arrays) (max array size is 65536 elements)

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	uint16 version_from; ///< save/load the variable starting from this savegame version

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	uint16 version_to;   ///< save/load the variable until this savegame version

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	/* NOTE: This element either denotes the address of the variable for a global

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	 * variable, or the offset within a struct which is then bound to a variable

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	 * during runtime. Decision on which one to use is controlled by the function

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	 * that is called to save it. address: SlGlobList, offset: SlObject */

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	void *address;       ///< address of variable OR offset of variable in the struct (max offset is 65536)

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} SaveLoad;

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/* Same as SaveLoad but global variables are used (for better readability); */

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typedef SaveLoad SaveLoadGlobVarList;

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/* Simple variables, references (pointers) and arrays */

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#define SLE_GENERAL(cmd, base, variable, type, length, from, to) {cmd, type, length, from, to, (void*)offsetof(base, variable)}

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#define SLE_CONDVAR(base, variable, type, from, to) SLE_GENERAL(SL_VAR, base, variable, type, 0, from, to)

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#define SLE_CONDREF(base, variable, type, from, to) SLE_GENERAL(SL_REF, base, variable, type, 0, from, to)

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#define SLE_CONDARR(base, variable, type, length, from, to) SLE_GENERAL(SL_ARR, base, variable, type, length, from, to)

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#define SLE_CONDSTR(base, variable, type, length, from, to) SLE_GENERAL(SL_STR, base, variable, type, length, from, to)

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#define SLE_VAR(base, variable, type) SLE_CONDVAR(base, variable, type, 0, SL_MAX_VERSION)

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#define SLE_REF(base, variable, type) SLE_CONDREF(base, variable, type, 0, SL_MAX_VERSION)

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#define SLE_ARR(base, variable, type, length) SLE_CONDARR(base, variable, type, length, 0, SL_MAX_VERSION)

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#define SLE_STR(base, variable, type, length) SLE_CONDSTR(base, variable, type, length, 0, SL_MAX_VERSION)

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#define SLE_CONDNULL(length, from, to) SLE_CONDARR(NullStruct, null, SLE_FILE_U8 | SLE_VAR_NULL | SLF_CONFIG_NO, length, from, to)

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/* Translate values ingame to different values in the savegame and vv */

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#define SLE_WRITEBYTE(base, variable, game_value, file_value) SLE_GENERAL(SL_WRITEBYTE, base, variable, 0, 0, game_value, file_value)

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/* Load common code and put it into each struct (currently only for vehicles */

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#define SLE_INCLUDE(base, variable, include_index) SLE_GENERAL(SL_INCLUDE, base, variable, 0, 0, include_index, 0)

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/* The same as the ones at the top, only the offset is given directly; used for unions */

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#define SLE_GENERALX(cmd, offset, type, param1, param2) {cmd, type, 0, param1, param2, (void*)(offset)}

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#define SLE_CONDVARX(offset, type, from, to) SLE_GENERALX(SL_VAR, offset, type, from, to)

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#define SLE_CONDREFX(offset, type, from, to) SLE_GENERALX(SL_REF, offset, type, from, to)

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#define SLE_VARX(offset, type) SLE_CONDVARX(offset, type, 0, SL_MAX_VERSION)

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#define SLE_REFX(offset, type) SLE_CONDREFX(offset, type, 0, SL_MAX_VERSION)

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#define SLE_WRITEBYTEX(offset, something) SLE_GENERALX(SL_WRITEBYTE, offset, 0, something, 0)

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#define SLE_INCLUDEX(offset, type) SLE_GENERALX(SL_INCLUDE, offset, type, 0, SL_MAX_VERSION)

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/* End marker */

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#define SLE_END() {SL_END, 0, 0, 0, 0, NULL}

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/* Simple variables, references (pointers) and arrays, but for global variables */

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#define SLEG_GENERAL(cmd, variable, type, length, from, to) {cmd, type, length, from, to, (void*)&variable}

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#define SLEG_CONDVAR(variable, type, from, to) SLEG_GENERAL(SL_VAR, variable, type, 0, from, to)

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#define SLEG_CONDREF(variable, type, from, to) SLEG_GENERAL(SL_REF, variable, type, 0, from, to)

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#define SLEG_CONDARR(variable, type, length, from, to) SLEG_GENERAL(SL_ARR, variable, type, length, from, to)

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#define SLEG_CONDSTR(variable, type, length, from, to) SLEG_GENERAL(SL_STR, variable, type, length, from, to)

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#define SLEG_VAR(variable, type) SLEG_CONDVAR(variable, type, 0, SL_MAX_VERSION)

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#define SLEG_REF(variable, type) SLEG_CONDREF(variable, type, 0, SL_MAX_VERSION)

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#define SLEG_ARR(variable, type) SLEG_CONDARR(variable, type, lengthof(variable), 0, SL_MAX_VERSION)

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#define SLEG_STR(variable, type) SLEG_CONDSTR(variable, type, lengthof(variable), 0, SL_MAX_VERSION)

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#define SLEG_CONDNULL(length, from, to) {SL_ARR, SLE_FILE_U8 | SLE_VAR_NULL | SLF_CONFIG_NO, length, from, to, (void*)NULL}

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#define SLEG_END() {SL_END, 0, 0, 0, 0, NULL}

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/** Checks if the savegame is below major.minor.

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 */

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static inline bool CheckSavegameVersionOldStyle(uint16 major, byte minor)

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{

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	extern uint16 _sl_version;

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	extern byte   _sl_minor_version;

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	return (_sl_version < major) || (_sl_version == major && _sl_minor_version < minor);

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}

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/** Checks if the savegame is below version.

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 */

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static inline bool CheckSavegameVersion(uint16 version)

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{

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	extern uint16 _sl_version;

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	return _sl_version < version;

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}

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/** Checks if some version from/to combination falls within the range of the

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 * active savegame version */

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static inline bool SlIsObjectCurrentlyValid(uint16 version_from, uint16 version_to)

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{

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	extern const uint16 SAVEGAME_VERSION;

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	if (SAVEGAME_VERSION < version_from || SAVEGAME_VERSION > version_to) return false;

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	return true;

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}

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/* Get the NumberType of a setting. This describes the integer type

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 * as it is represented in memory

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 * @param type VarType holding information about the variable-type

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 * @return return the SLE_VAR_* part of a variable-type description */

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static inline VarType GetVarMemType(VarType type)

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{

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	return type & 0xF0; // GB(type, 4, 4) << 4;

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}

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/* Get the FileType of a setting. This describes the integer type

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 * as it is represented in a savegame/file

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 * @param type VarType holding information about the variable-type

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 * @param return the SLE_FILE_* part of a variable-type description */

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static inline VarType GetVarFileType(VarType type)

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{

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	return type & 0xF; // GB(type, 0, 4);

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}

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/** Get the address of the variable. Which one to pick depends on the object

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 * pointer. If it is NULL we are dealing with global variables so the address

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 * is taken. If non-null only the offset is stored in the union and we need

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 * to add this to the address of the object */

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static inline void *GetVariableAddress(const void *object, const SaveLoad *sld)

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{

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	return (byte*)object + (ptrdiff_t)sld->address;

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}

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int64 ReadValue(const void *ptr, VarType conv);

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void WriteValue(void *ptr, VarType conv, int64 val);

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void SlSetArrayIndex(uint index);

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int SlIterateArray(void);

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void SlAutolength(AutolengthProc *proc, void *arg);

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uint SlGetFieldLength(void);

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void SlSetLength(size_t length);

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size_t SlCalcObjMemberLength(const void *object, const SaveLoad *sld);

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byte SlReadByte(void);

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void SlWriteByte(byte b);

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void SlGlobList(const SaveLoadGlobVarList *sldg);

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void SlArray(void *array, uint length, VarType conv);

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void SlObject(void *object, const SaveLoad *sld);

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bool SlObjectMember(void *object, const SaveLoad *sld);

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void SaveFileStart(void);

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void SaveFileDone(void);

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void SaveFileError(void);

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#endif /* SAVELOAD_H */