/* 
*  BSD 2-Clause “Simplified” License
*  Copyright (c) 2019, Aldrik Ramaekers, aldrik.ramaekers@protonmail.com
*  All rights reserved.
*/

#ifndef INCLUDE_PLATFORM
#define INCLUDE_PLATFORM

//	:/Title	Platform
//	:/Text	Provides an interface to interact with the underlying operating system.

typedef struct t_platform_window platform_window;
typedef struct t_backbuffer backbuffer;

////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////

typedef struct t_found_file
{
	char *matched_filter;
	char *path;
} found_file;

typedef struct t_file_match
{
	found_file file;
	s16 file_error;
	s32 file_size;
	
	u32 line_nr;
	s32 word_match_offset;
	s32 word_match_length;
	s32 word_match_offset_x; // highlight render offset
	s32 word_match_width; // highlight render width
	char *line_info; // will be null when no match is found
} file_match;

typedef struct t_search_info
{
	u64 file_count;
	u64 dir_count;
} search_info;

typedef struct t_file_content
{
	s64 content_length;
	u8 *content;
	s16 file_error;
} file_content;

typedef enum t_time_type
{
	TIME_FULL,     // realtime
	TIME_THREAD,   // run time for calling thread
	TIME_PROCESS,  // run time for calling process
} time_type;

typedef enum t_time_precision
{
	TIME_NS, // nanoseconds
	TIME_US, // microseconds
	TIME_MILI_S, // miliseconds
	TIME_S,  // seconds
} time_precision;

typedef struct t_cpu_info
{
	s32 model;
	char model_name[255];
	float32 frequency;
	u32 cache_size;
	u32 cache_alignment;
} cpu_info;

typedef enum t_file_dialog_type
{
	OPEN_FILE,
	OPEN_DIRECTORY,
	SAVE_FILE,
} file_dialog_type;

typedef enum t_file_open_error
{
	FILE_ERROR_TOO_MANY_OPEN_FILES_PROCESS = 1,
	FILE_ERROR_TOO_MANY_OPEN_FILES_SYSTEM = 2,
	FILE_ERROR_NO_ACCESS = 3,
	FILE_ERROR_NOT_FOUND = 4,
	FILE_ERROR_CONNECTION_ABORTED = 5,
	FILE_ERROR_CONNECTION_REFUSED = 6,
	FILE_ERROR_NETWORK_DOWN = 7,
	FILE_ERROR_REMOTE_IO_ERROR = 8,
	FILE_ERROR_STALE = 9, // NFS server file is removed/renamed
	FILE_ERROR_GENERIC = 10,
	FILE_ERROR_TOO_BIG = 11,
} file_open_error;

typedef struct t_open_dialog_args
{
	char *buffer;
	char *file_filter;
	char *start_path;
	char *default_save_file_extension;
	file_dialog_type type;
} open_dialog_args;

typedef struct t_list_file_args
{
	array *list;
	char *start_dir;
	char *pattern;
	bool recursive;
	bool include_directories;
	bool *state;
	bool *is_cancelled;
	memory_bucket *bucket;
	search_info *info;
} list_file_args;

typedef enum t_cursor_type
{
	CURSOR_DEFAULT,
	CURSOR_POINTER,
	CURSOR_TEXT,
	CURSOR_DRAG,
	CURSOR_LOADING,
} cursor_type;

// TODO: move this to more appropriate file.
typedef struct t_vec2
{
	s32 x;
	s32 y;
} vec2;

typedef struct t_backbuffer_pixel
{
	s32 color;
	u8 depth; 
} backbuffer_pixel;

// NOT IMPLEMENTED ON LINUX: USE FLAGS_NONE
typedef enum t_window_flags
{
	FLAGS_NONE = 0,
	FLAGS_BORDERLESS = 1,
	FLAGS_TOPMOST = 2,
	FLAGS_GLOBAL_MOUSE = 4,
	FLAGS_HIDDEN = 8,
	FLAGS_NO_TASKBAR = 16,
} window_flags;
// NOT IMPLEMENTED ON LINUX: USE FLAGS_NONE

float frame_delta = 0.0f;
float update_delta = 0.0f;
array window_registry;

keyboard_input _global_keyboard;
mouse_input _global_mouse = {-1};
camera _global_camera;

#define platform_open_window(name, width, height, max_w, max_h, min_w, min_h, update_func, resize_func) platform_open_window_ex(name,width,height,max_w,max_h,min_w,min_h, 0, update_func, resize_func)

platform_window* 	platform_open_window_ex(char *name, u16 width, u16 height, u16 max_w, u16 max_h, u16 min_w, u16 min_h, s32 flags, void (*update_func)(platform_window* window), void (*resize_func)(platform_window* window, u32 change_x,u32 change_y));
file_content 		platform_read_file_content(char *path, const char *mode);

bool 	platform_window_is_valid(platform_window *window);
bool 	platform_is_graphical();
void 	platform_get_focus(platform_window *window);
void 	platform_show_window(platform_window *window);
void 	platform_hide_window(platform_window *window);
bool 	platform_set_clipboard(platform_window *window, char *buffer);
bool 	platform_get_clipboard(platform_window *window, char *buffer);
void 	platform_window_set_size(platform_window *window, u16 width, u16 height);
void 	platform_window_set_position(platform_window *window, u16 x, u16 y);
void 	platform_destroy_window(platform_window *window);
void 	platform_handle_events();
void 	platform_window_swap_buffers(platform_window *window);
void 	platform_set_cursor(platform_window *window, cursor_type type);
void 	platform_window_set_title(platform_window *window, char *name);
s32 	platform_get_file_size(char *path);
bool 	platform_write_file_content(char *path, const char *mode, char *buffer, s32 len);
void 	platform_destroy_file_content(file_content *content);
bool 	platform_get_active_directory(char *buffer);
bool 	platform_set_active_directory(char *path);
void 	platform_show_message(platform_window *window, char *message, char *title);
void 	platform_list_files_block(array *list, char *start_dir, array filters, bool recursive, memory_bucket *bucket, bool include_directories, bool *is_cancelled, search_info *info);
void 	platform_list_files(array *list, char *start_dir, char *filter, bool recursive, memory_bucket *bucket, bool *is_cancelled, bool *state, search_info *info);
void 	platform_open_file_dialog(file_dialog_type type, char *buffer, char *file_filter, char *start_path, char *save_file_extension);
bool 	platform_get_mac_address(char *buffer, s32 buf_size);
void*	platform_open_file_dialog_block(void *arg);
char*	platform_get_full_path(char *file);
void 	platform_open_url(char *command);
bool 	platform_send_http_request(char *url, char *params, char *response_buffer);
void 	platform_run_command(char *command);
void 	platform_window_make_current(platform_window *window);
void 	platform_init(int argc, char **argv, char* config_path);
void 	platform_destroy();
void 	platform_setup_backbuffer(platform_window *window);
void 	platform_setup_renderer();
void 	platform_set_icon(platform_window *window, image *img);
void 	platform_autocomplete_path(char *buffer, bool want_dir);
bool 	platform_directory_exists(char *path);
void 	platform_create_directory(char *path);
bool 	platform_file_exists(char *path);
void 	platform_show_alert(char *title, char *message);
char*	platform_get_config_save_location(char *buffer, char *directory);
char*	platform_get_file_extension(char *path);
void 	platform_get_name_from_path(char *buffer, char *path);
void 	platform_get_directory_from_path(char *buffer, char *path);
vec2 	platform_get_window_size(platform_window *window);
s32 	platform_filter_matches(array *filters, char *string, char **matched_filter);
bool 	platform_delete_file(char *path);
s32		platform_get_titlebar_height();
void 	platform_toggle_fullscreen(platform_window* window, bool fullscreen);

//	:/Info	Check if the window is still open. Should be used in the main loop.
//	:/Ret	true when open, false when closed.
bool 	platform_keep_running(platform_window *window);

//	:/Info	Get the current time.
//	:/Ret	The time in ns, μs, ms or sec depending on given parameters.
u64 	platform_get_time(time_type time_type, time_precision precision);

//	:/Info	Retrieve the the installed amount of memory on de machine.
//	:/Ret	The amount of memory installed, in KB.
s32 	platform_get_memory_size();

//	:/Info	Retrieve the number of cpu cores on the machine.
//	:/Ret	The number of cpu cores on the machine.
s32 	platform_get_cpu_count();

//	:/Info	Toggle vsync. On by default.
void 	platform_toggle_vsync(platform_window* window, bool on);

void _platform_init_shared(int argc, char **argv, char* config_path);
void _platform_destroy_shared();
void _platform_handle_events_for_window(platform_window *window);
void _platform_register_window(platform_window* window);
void _platform_unregister_window(platform_window* window);

#endif