#ifndef OBJECT_H
#define OBJECT_H

#include <stdlib.h>

#define MAX_TOK_CNT 1024
#define MAX_ENV_ELM 100
#define RESULT_LENGTH 128

#define FOR_POINTER_IN_LIST(_list) \
    if(_list && isListy(*_list)) \
    for(Object *_element = _list->list; \
            _element != NULL;\
            _element = _element->forward)
#define POINTER _element

#define FOR_POINTERS_IN_LISTS(_list, _list2) \
    for(Object *_element = _list->list, *_element2 = _list2->list; \
            _element != NULL && _element2 != NULL; \
            _element = _element->forward, _element2 = _element2->forward)
#define P1 POINTER
#define P2 _element2

#ifdef PBL_PLATFORM_APLITE
    #define LOW_MEM
#endif

#ifdef LOW_MEM
    #define SIMPLE_ERRORS
#endif

enum errorCode {
    MISMATCHED_PARENS,
    BAD_LIST_OF_SYMBOL_STRINGS,
    TYPE_LIST_NOT_CAUGHT,
    NULL_ENV,
    EMPTY_ENV,
    BUILT_IN_NOT_FOUND,
    NULL_PARSE,
    NULL_LAMBDA_LIST,
    NULL_MAP_ARGS,
    LAMBDA_ARGS_NOT_LIST,
    DID_NOT_FIND_SYMBOL,
    BAD_TYPE,
    UNEXPECTED_FORM,
    LISTS_NOT_SAME_SIZE,
    BAD_NUMBER,
    UNSUPPORTED_NUMBER_TYPE,
    NOT_A_SYMBOL,
    ONLY_ONE_ARGUMENT,
    NOT_A_LIST,
    SCRIPT_NOT_FOUND,
    NO_CLONE_SPECIFIED,
    CAN_ONLY_EVAL_STRINGS,
    UNEXPECTED_EOF,
    INDEX_PAST_END,
};

typedef enum Type {
    TYPE_NUMBER,
    TYPE_BOOL,
    TYPE_LIST,
    TYPE_SLIST,
    TYPE_FUNC,
    TYPE_SYMBOL,
    TYPE_LAMBDA,
    TYPE_STRING,
    TYPE_OTHER,
    TYPE_ERROR
} Type;

typedef struct Object Object;
struct Lambda;
struct Environment;
struct Slice;
struct Other;
struct Error {
    enum errorCode code;
    char* context;
};

struct Object {
    Type type;
    Object *forward;
    union {
        int number;
        Object *list;
        char *string;
        Object (*func)(Object, Object, struct Environment *);
        struct Lambda *lambda;
        struct Other *other;
        #ifdef SIMPLE_ERRORS
        enum errorCode error;
        #else
        struct Error *error;
        #endif
    };
};

struct Lambda {
    Object params;
    Object body;
};

struct Other {
    void (*cleanup)(Object*);
    Object (*clone)(struct Other*);
    void *data;
};

char* stringNObj(char *dest, const Object *obj, size_t len);
char* stringObj(char *dest, const Object *obj);
void printList(const Object *list);
void printType(const Object *obj);
void printObj(const Object *obj);
void _printObj(const Object *obj, int newline);
void debugObj(const Object *obj);
void printErr(const Object *obj);

int isEmpty(const Object *obj);
Object *tail(const Object *listObj);
void insertIntoList(Object *dest, int ind, const Object src);
void replaceListing(Object *list, int i, const Object src);
void nf_addToList(Object *dest, Object src);
void deleteList(Object *dest);

int listLength(const Object *listObj);
Object *itemAt(const Object *listObj, int n);
void copyList(Object *dest, const Object *src);

void cleanObject(Object *target);
void printAndClean(Object *target);
void allocObject(Object **spot, const Object src);
void appendList(Object *dest, const Object *src);

int isListy(const Object test);
int isStringy(const Object test);
int isValidType(const Object test);
int isError(const Object obj, const enum errorCode err);
int bothAre(const enum Type type, const Object *obj1, const Object *obj2);
int eitherIs(const enum Type type, const Object *obj1, const Object *obj2);
int areSameType(const Object *obj1, const Object *obj2);

Object cloneList(const Object src);
Object cloneString(Object obj);
Object cloneLambda(const Object old);
Object cloneObject(const Object src);

Object newObject(Type type);
Object listObject();
Object startList(const Object start);
Object objFromSlice(const char *string, int len);
Object stringFromSlice(const char *string, int len);
Object symFromSlice(const char *string, int len);
Object boolObject(int b);
Object numberObject(int num);
Object otherObject();
Object errorObject(enum errorCode err);
enum errorCode getErrorCode(const Object obj);
#ifdef SIMPLE_ERRORS
    #define errorWithContext(code, context) errorObject(code)
    #define errorAddContext(x, y) ;
#else
Object errorWithContext(enum errorCode err, const char* context);
void errorAddContext(Object *o, const char* context);
#endif
struct Error noError();

Object constructLambda(const Object *params, const Object *body);

// Object version of listLength()
Object len(Object obj1, Object, struct Environment *);

#endif