RES_SharedState RES_shared_state = ZI;

////////////////////////////////
//~ Startup

RES_StartupReceipt RES_Startup(void)
{
    __prof;
    RES_SharedState *g = &RES_shared_state;
    g->arena = AllocArena(Gibi(64));

#if RESOURCES_EMBEDDED
    String embedded_data = INC_GetResTar();
    if (embedded_data.len <= 0)
    {
        P_Panic(Lit("No embedded resources found"));
    }
    g->archive = TAR_ArchiveFromString(g->arena, embedded_data, Lit(""));
#else
    /* Ensure we have the right working directory */
    if (!P_IsDir(Lit("res")))
    {
        P_Panic(Lit("Resource directory \"res\" not found. Make sure the executable is being launched from the correct working directory."));
    }
#endif

    return (RES_StartupReceipt) { 0 };
}

////////////////////////////////
//~ Open / close

RES_Resource RES_OpenResource(String name)
{
    __prof;
#if RESOURCES_EMBEDDED
    RES_SharedState *g = &RES_shared_state;
    RES_Resource result = ZI;
    TAR_Entry *entry = TAR_EntryFromName(&g->archive, name);
    result._data = entry->data;
    result._name = entry->file_name;
    result._exists = entry->valid;
    return result;
#else
    RES_Resource result = ZI;
    if (name.len < countof(result._name_text))
    {
        u8 path_text[RES_ResourceNameLenMax + (sizeof("result/") - 1)];
        String path = ZI;
        {
            path_text[0] = 'r';
            path_text[1] = 'e';
            path_text[2] = 's';
            path_text[3] = '/';
            u64 path_text_len = 4;
            CopyBytes(path_text + path_text_len, name.text, name.len);
            path_text_len += name.len;
            path = STRING(path_text_len, path_text);
        }

        P_File file = P_OpenFileReadWait(path);
        P_FileMap file_map = ZI;
        String data = ZI;
        if (file.valid)
        {
            file_map = P_OpenFileMap(file);
            if (file_map.valid)
            {
                data = P_GetFileMapData(file_map);
            }
            else
            {
                P_CloseFileMap(file_map);
            }
        }
        else
        {
            P_CloseFIle(file);
        }

        result._exists = file.valid && file_map.valid;
        result._data = data;
        result._file = file;
        result._file_map = file_map;
        result._name_len = name.len;
        CopyBytes(result._name_text, name.text, name.len);
    }
    else
    {
        Assert(0);
    }
    return result;
#endif
}

#if !RESOURCES_EMBEDDED
void RES_CloseResource(RES_Resource *res_ptr)
{
    P_CloseFileMap(res_ptr->_file_map);
    P_CloseFIle(res_ptr->_file);
}
#endif