#ifndef RESOURCE_H
#define RESOURCE_H

#include "sys.h"

#define RESOURCE_NAME_LEN_MAX 255

/* A resource contains data that can be retrieved globally by name.
 * If enabled during compilation, resource data is embedded in the
 * executable. Otherwise each resource represents a file on disk. */
struct resource {
    struct string _data;
    b32 _exists;
#if RESOURCES_EMBEDDED
    struct string _name;
#else
    struct sys_file _file;
    struct sys_file_map _file_map;
    u8 _name_text[RESOURCE_NAME_LEN_MAX];
    u8 _name_len;
#endif
};

/* ========================== *
 * Startup
 * ========================== */

struct resource_startup_receipt { i32 _; };
struct resource_startup_receipt resource_startup(void);

/* ========================== *
 * Open / close
 * ========================== */

struct resource resource_open(struct string name);

#if RESOURCES_EMBEDDED
    #define resource_close(res_ptr)
#else
    void resource_close(struct resource *res_ptr);
#endif

/* ========================== *
 * Data
 * ========================== */

#define resource_get_data(res_ptr) (res_ptr)->_data

#define resource_exists(res_ptr) (res_ptr)->_exists

#if RESOURCES_EMBEDDED
    #define resource_get_name(res_ptr) (res_ptr)->_name
#else
    #define resource_get_name(res_ptr) STRING((res_ptr)->_name_len, (res_ptr)->_name_text)
#endif

/* ========================== *
 * Watch
 * ========================== */

#define RESOURCE_WATCH_CALLBACK_FUNC_DEF(func_name, arg_name) void func_name(struct string arg_name)
typedef RESOURCE_WATCH_CALLBACK_FUNC_DEF(resource_watch_callback, name);

#if RESOURCE_RELOADING
    void resource_register_watch_callback(resource_watch_callback *callback);
#else
    #define resource_register_watch_callback(callback)
#endif

#endif