with ada.text_io, ada.strings.unbounded, interfaces.c;
use  ada.text_io, ada.strings.unbounded, interfaces.c;

package core is

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	type terminal_colour is (
		grey,                   red,                    green,                  yellow,                 blue,                   pink,
		cyan,                   white
	);

	type terminal_effect is (
		normal,                 bold,                   italic,                 underline,              blink,                  invert
	);

	type echo_status is (
		failure,                warning,                success,                comment
	);

	type signal_code is (
		signal_none,            signal_space,           signal_0,               signal_1,               signal_2,               signal_3,
		signal_4,               signal_5,               signal_6,               signal_7,               signal_8,               signal_9,
		signal_a,               signal_b,               signal_c,               signal_d,               signal_e,               signal_f,
		signal_g,               signal_h,               signal_i,               signal_j,               signal_k,               signal_l,
		signal_m,               signal_n,               signal_o,               signal_p,               signal_q,               signal_r,
		signal_s,               signal_t,               signal_u,               signal_v,               signal_w,               signal_x,
		signal_y,               signal_z,               signal_grave,           signal_escape,          signal_enter,           signal_tab,
		signal_backspace,       signal_right,           signal_left,            signal_down,            signal_up,              signal_kp_0,
		signal_kp_1,            signal_kp_2,            signal_kp_3,            signal_kp_4,            signal_kp_5,            signal_kp_6,
		signal_kp_7,            signal_kp_8,            signal_kp_9,            signal_kp_subtract,     signal_kp_add,          signal_left_shift,
		signal_left_control
	);

	subtype short_string is string (1 .. 24);
	subtype long_string  is string (1 .. 72);

	type accessor is access procedure;

	type colour_range is range 0 .. 2 ** 32 - 1;

	type sprite is
	record
		index, width, height, frames, states : integer;
	end record;

	type glyphs is
	record
		index, size, pad : integer;
	end record;

	type vector is
	record
		x, y : integer;
	end record;

	type volatile is
	record
		data    : unbounded_string := null_unbounded_string;
		rows    : integer          := 0;
		columns : integer          := 0;
	end record;

                                             ------------------------------------------------------------------------------------------

	icon                : constant natural := 32;
	base                : constant natural := 32;
	gameplay_framerate  : constant natural := 60;
	animation_framerate : constant natural :=  6;

	cursor        : vector  := (0, 0);
	cursor_mode   : integer := 0;
	signal_mode   : integer := 0;
	engine_active : boolean := false;
	framerate     : integer := 0;

	global_time    : natural := 0;
	gameplay_time  : natural := 0;
	animation_time : natural := 0;

	hexagon_grid_sprite : sprite;
	hexagon_fill_sprite : sprite;

	camera : vector := (0, 0);

	text_box : volatile;

                                             ------------------------------------------------------------------------------------------

	procedure terminal (colour : in terminal_colour := white; effect : in terminal_effect := normal);

	procedure echo (status : in echo_status; message : in string);

	procedure dash;
	procedure semi_dash;

	function flip_coin                           return integer;
	function roll_dice                           return integer;
	function by_chance (chance     : in integer) return integer;
	function c_string  (ada_string : in string)  return string;

	function random_integer (minimum, maximum : in integer) return integer;

	function clip (value, minimum, maximum : in integer) return integer;

	function import_sprite (file_path : in string; frames, states : in integer) return sprite;
	function import_song   (file_path : in string)                              return integer;
	function import_glyphs (file_path : in string; size, pad      : in integer) return glyphs;

	procedure crop (data : in sprite; x, y, u, v, width, height : in integer);
	procedure view (data : in sprite; x, y, u, v, width, height : in integer);
	procedure draw (data : in sprite; x, y                      : in integer);
	procedure move (data : in sprite; x, y, frame, state        : in integer);

	procedure line (origin, offset : in vector);

	procedure write (text : in string; x, y : in integer; data : in glyphs; colour : in colour_range := 16#FFFFFFFF#);
	procedure debug (text : in string);

	procedure hexagonal_grid (x, y, width, height : in integer; fill : in boolean);

	function lowercase (text : in string) return string;
	function uppercase (text : in string) return string;

	procedure draw_central_grid (x, y, width, height : in integer);
	procedure draw_squared_grid (x, y, width, height : in integer);
	procedure draw_hexagon_grid (x, y, width, height : in integer);

	function read_text_box return string;

	procedure write_text_box (text : in string);

	procedure initialize;
	procedure deinitialize;
	procedure synchronize;

	function window_width  return integer;
	function window_height return integer;

	procedure render_sprite (sprite, x, y, u, v, width, height : in integer);
	procedure render_string (text : in string; x, y : in integer; colour : in colour_range; index, size, pad : in integer);
	procedure render_vector (x1, y1, x2, y2 : in integer);

	procedure play_song (index : in integer);
	procedure stop_song (index : in integer);

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end core;