#ifndef TC_ENTITY_H
#define TC_ENTITY_H

#include "utility/location.h"
#include "utility/utility.h"

typedef struct tc_interval                  tc_interval_s;
typedef struct tc_entity_event              tc_entity_event_s;
typedef struct tc_entity_type               tc_entity_type_s;
typedef struct tc_entity_attribute          tc_entity_attribute_s;
typedef struct tc_entity                    tc_entity_s;
typedef struct tc_entity_pool               tc_entity_pool_s;
typedef struct tc_entity_pool_entry         tc_entity_pool_entry_s;
typedef struct tc_entity_registry           tc_entity_registry_s;

typedef void (*tc_entity_create_fn)          (tc_entity_s *entity, void *userdata);
typedef void (*tc_entity_delete_fn)          (tc_entity_s *entity);
typedef void (*tc_entity_send_event_fn)      (tc_entity_s *entity, tc_entity_event_s event);

typedef struct
{
    tc_entity_create_fn         fn_create;
    tc_entity_delete_fn         fn_delete;
    tc_entity_send_event_fn     fn_send_event;
    
} tc_fn_entity_s;

struct tc_entity_event
{
    char                       *identifier;
    
    union
    {
        void                       *pointer;
        char                       *string;
        i64_t                     integer;
        f64_t                      floating;
    } value;
};

struct tc_entity_type
{
    char                       *internal_name;
    char                       *display_name;
    
    tc_fn_entity_s              functions;
    
    u32_t                       instances_capacity;
    u32_t                       num_instances;
    tc_entity_s               **instances;
};

struct tc_entity_attribute
{
    char                       *name;
    u32_t                    index;
    
    union
    {
        void                       *pointer;
        char                       *string;
        i64_t                     integer;
        f64_t                      floating;
    } value;
    
};

struct tc_entity
{
    tc_entity_pool_entry_s     *pool_entry;
    
    tc_entity_type_s           *type;
    
    u16_t                       attributes_capacity;
    u16_t                       num_attributes;
    tc_entity_attribute_s      *attributes;
    
    void                       *specific;
    
};

struct tc_interval
{
    u64_t                        last_invocation;
    u64_t                        wanted_delta;
    tc_entity_s                    *entity;
    void                          (*fn_interval)        (tc_entity_s *entity);
};

struct tc_entity_pool_entry
{
    tc_entity_pool_entry_s     *next;
    tc_entity_pool_entry_s     *previous;
    
    tc_entity_s                 entity;
};

struct tc_entity_pool
{
    u32_t                       entities_capacity;
    tc_entity_pool_entry_s     *entities;
    tc_entity_pool_entry_s     *first_free;
    
    tc_entity_pool_s           *continuation;
};

struct tc_entity_registry
{
    u32_t                       types_capacity;
    u32_t                       num_types;
    tc_entity_type_s           *types;
    
    tc_entity_pool_s           *pool;
    
    u32_t                       intervals_capacity;
    u32_t                       num_intervals;
    tc_interval_s              *intervals;
};

tc_entity_pool_s *              tc_create_entity_pool           (u32_t capacity);
tc_entity_registry_s            tc_init_entity_registry         ();
void                            tc_register_entity_type         (tc_entity_type_s type);

tc_entity_type_s *              tc_get_entity_type_with_name    (char *name);

tc_entity_s *                   tc_create_entity                (char *type, void *userdata);
void                            tc_delete_entity                (tc_entity_s *entity);

void                            tc_set_pointer_for_entity       (tc_entity_s *entity, char *attr_name, void *pointer);
void                            tc_set_string_for_entity        (tc_entity_s *entity, char *attr_name, char *string);
void                            tc_set_integer_for_entity       (tc_entity_s *entity, char *attr_name, i64_t integer);
void                            tc_set_float_for_entity         (tc_entity_s *entity, char *attr_name, f64_t floating);

void *                          tc_get_pointer_from_entity      (tc_entity_s *entity, char *attr_name);
char *                          tc_get_string_from_entity       (tc_entity_s *entity, char *attr_name);
i64_t                           tc_get_integer_from_entity      (tc_entity_s *entity, char *attr_name);
f64_t                           tc_get_float_from_entity        (tc_entity_s *entity, char *attr_name);

void                            tc_send_pointer_to_entity       (tc_entity_s *entity, char *event_name, void *pointer);
void                            tc_send_string_to_entity        (tc_entity_s *entity, char *event_name, char   *string);
void                            tc_send_integer_to_entity       (tc_entity_s *entity, char *event_name, i64_t integer);
void                            tc_send_float_to_entity         (tc_entity_s *entity, char *event_name, f64_t  floating);

void                            tc_schedule_interval            (tc_entity_s *entity, float wanted_delta, void (*fn_interval)(tc_entity_s *entity));
void                            tc_tick_intervals               ();
void                            tc_draw_all_entities_of_type    (char *name);

tc_entity_s *                   tc_allocate_entity              ();
void                            tc_deallocate_entity            (tc_entity_s *entity);

#endif // TC_ENTITY_H