#pragma once

#if __cplusplus
extern "C" {
#endif

#include "std.h"
#include "type_system/unitype.h"

typedef enum ErrorId {
    SUCCESS, // not an error 
    ERR_MAXLENGTH, ERR_WRONGTYPE, ERR_WRONGINDEX, 
    ERR_NOTIMPLEMENTED, ERR_NULLPTR, ERR_ENDOFSTR, 
    ERR_KEYNOTFOUND, ERR_FORMAT, ERR_UNEXPECTEDVAL
} ErrorId;

char* errname(ErrorId err);

char* __genErrMsg(const char* errmsg, const char* srcfile, int line, const char* funcname);
char* __extendErrMsg(const char* errmsg, const char* srcfile, int line, const char* funcname);

typedef struct Maybe{
    Unitype value;
    char* errmsg;
} Maybe;

// return it if func doesn't return anything
//                            .value  .errmsg
#define MaybeNull (Maybe){UniNull, NULL}

void Maybe_free(Maybe e);
void printMaybe(Maybe e);


#define SUCCESS(REZLT) (Maybe){.errmsg=NULL, .value=REZLT}

#define __RETURN_EXCEPTION(ERRMSG) return (Maybe){.errmsg=ERRMSG, .value=UniNull}

#define __EXIT(ERRMSG) ({ printf("\e[91m%s\e[0m \n", ERRMSG); free(ERRMSG); exit(128); })

char* __doNothing(char* a);
char* __unknownErr( );

#define __stringify_err(E) _Generic(\
    (E),\
    char*: __doNothing,\
    int: errname,\
    default: __unknownErr\
)(E)

#if __cplusplus
    #define throw_id(E) __EXIT(((char*)__genErrMsg(errname(E), __FILE__,__LINE__,__func__)))
    #define throw_msg(E) __EXIT(((char*)__genErrMsg(E, __FILE__,__LINE__,__func__)))
#else
    #define throw(E) __EXIT(((char*)__genErrMsg((__stringify_err(E)), __FILE__,__LINE__,__func__)))
    #define safethrow(E, FREEMEM) { FREEMEM; __RETURN_EXCEPTION(((char*)__genErrMsg((__stringify_err(E)), __FILE__,__LINE__,__func__))); }

#define try(_funcCall, _rezult, freeMem) Maybe _rezult=_funcCall; if(_rezult.errmsg){\
        freeMem;\
        _rezult.errmsg=__extendErrMsg(_rezult.errmsg, __FILE__,__LINE__,__func__);\
        return _rezult;\
    }

#define tryLast(_funcCall, _rezult) Maybe _rezult=_funcCall; if(_rezult.errmsg){\
        _rezult.errmsg=__extendErrMsg(_rezult.errmsg, __FILE__,__LINE__,__func__);\
        __EXIT(_rezult.errmsg);\
    }
    
#endif

#if __cplusplus
}
#endif