#ifndef OBJECT_H
#define OBJECT_H

#include <stdlib.h>

#ifndef STANDALONE
#include <pebble.h>
#undef sprintf
#define sprintf(_dest, args...) snprintf(_dest, 999, args)

#else
#ifdef DEBUG
#define printd(...) printf(__VA_ARGS__)
#else
#define printd(...) do { } while (0)
#endif
#endif

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

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

#ifdef PBL_PLATFORM_APLITE
#define LOW_MEM
#endif

#ifdef LOW_MEM
#define SIMPLE_ERRORS
#endif

enum errorCode {
    MISMATCHED_PARENS,
    NULL_ENV,
    EMPTY_ENV,
    NULL_PARSE,
    NULL_LAMBDA_LIST,
    NULL_MAP_ARGS,
    LAMBDA_ARGS_NOT_LIST,
    DID_NOT_FIND_SYMBOL,
    BAD_TYPE,
    BAD_PARAMS_ON,
    BAD_NUMBER,
    UNSUPPORTED_NUMBER_TYPE,
    NOT_ENOUGH_ARGUMENTS,
    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_STRUCT,
    TYPE_FUNC,
    TYPE_SYMBOL,
    TYPE_LAMBDA,
    TYPE_STRING,
    TYPE_OTHER,
    TYPE_ERROR
} Type;

typedef struct Object Object;

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

struct Object {
    Type type;

    union {
        int number;
        Object* list;
        char* string;

        Object (* func)(Object*, int, struct Environment*);

        struct StructObject* structObject;
        struct Lambda* lambda;
        struct Other* other;
#ifdef SIMPLE_ERRORS
        enum errorCode error;
#else
        struct Error* error;
#endif
    };

    Object* forward;
};

struct StructDef {
    int fieldCount;
    char* name;
    char** names;
};

struct StructObject {
    int definition;
    struct Object* fields; // Order should match that in the definition.
};

struct Lambda {
    int refs;
    Object params;
    Object body;
};

struct Other {
    void (* cleanup)(Object*);

    Object (* clone)(struct Other*);

    void* data;
};

struct string {
    char* allocPoint;
    char* cursor;
    size_t capacity;
};

/**
 * Returns a dynamically-sized string representation of the given object.
 *
 * _Adds_ the length of the new string to the `length` parameter.
 */
char* stringObj(const Object* obj, size_t* length);

void printType(const Object* obj);

void printObj(const Object* obj);

void _printObj(const Object* obj, int newline);

void debugObj(const Object* obj);

int isEmpty(const Object* obj);

Object* tail(const Object* listObj);

Object* nf_addToList(Object* dest, Object src);

void deleteList(Object* dest);

int listLength(const Object* listObj);

Object* itemAt(const Object* listObj, int n);

Object copyList(const Object* src);

void cleanObject(Object* target);

void printAndClean(Object* target);

void allocObject(Object** spot, Object src);

void appendList(Object* dest, const Object* src);

int isNumber(Object test);

int isListy(Object test);

int isStringy(Object test);

int isBool(Object test);

int isStruct(Object test);

int isFuncy(Object test);

int isValidType(Object test);

int isError(Object obj, enum errorCode err);

int bothAre(enum Type type, const Object* obj1, const Object* obj2);

int areSameType(const Object* obj1, const Object* obj2);

Object cloneList(Object src);

Object cloneString(Object obj);

Object cloneLambda(Object old);

Object cloneObject(Object src);

Object newObject(Type type);

Object listObject();

Object startList(Object start);

Object objFromSlice(const char* string, int len);

Object nullTerminated(const char* string);

Object stringFromSlice(const char* string, int len);

Object symFromSlice(const char* string, int len);

Object withLen(size_t len, enum Type type);

Object boolObject(int b);

Object numberObject(int num);

Object structObject(int definition);

Object otherObject();

Object errorObject(enum errorCode err);

enum errorCode getErrorCode(Object obj);

Object errorWithContextLineNo(enum errorCode code, const char* context, int lineNo, const char* fileName);

#ifdef SIMPLE_ERRORS
#define errorWithContext(code, context) errorObject(code)
#define errorAddContext(x, y, z, a) ;
#else
#define errorWithContext(_code, _context) errorWithContextLineNo(_code, _context, __LINE__, __FILE__)

void errorAddContext(Object* o, const char* context, int lineNo, const char* fileName);

#endif

struct Error noError();

Object constructLambda(const Object* params, const Object* body, struct Environment* env);

#ifdef STANDALONE
int getAllocations();

size_t getBytes();

void* scalloc(size_t size, size_t count);

void* smalloc(size_t size);

#define malloc(x) smalloc(x)
#define calloc(x, y) scalloc(x, y)

#endif // STANDALONE

#endif