open Printf

let rec run (cpu: Cpu.t) (mem: Memory.map) (screen: Screen.t) =
  Cpu.run cpu mem;
  run cpu mem screen

(** Power up sequence
    http://bgb.bircd.org/pandocs.htm#powerupsequence *)
let power_up cartridge =
  (** Nintendo logo scrolling *)
  if not (Cartridge.check_nintendo_logo cartridge)
  then print_endline "Invalid ROM."
  else
    print_endline "Valid ROM.";
    Cartridge.print_info cartridge;

    let cpu = Cpu.init_cpu in
    let mem = Memory.init cartridge in
    let screen = Screen.init in

    Graphics.open_graph "";
    Graphics.resize_window Screen.width Screen.height;

    run cpu mem screen


let () =
  if Array.length Sys.argv < 2 then
  begin
    prerr_endline "Please specify a ROM.";
    eprintf "Usage: %s path/to/rom\n" Sys.argv.(0);
    exit 1;
  end;

  let cartridge = Cartridge.read_cartridge Sys.argv.(1) in
  match cartridge with
  | None -> print_endline "Invalid ROM file."
  | Some c -> power_up c