with Ada.Text_IO;         use Ada.Text_IO;
with Ada.Float_Text_IO;   use Ada.Float_Text_IO;

procedure Flight_Sim is

   type Vector3 is record
      X : Float := 0.0;
      Y : Float := 0.0;
      Z : Float := 0.0;
   end record;

   function "+" (A, B : Vector3) return Vector3 is
   begin
      return (A.X + B.X, A.Y + B.Y, A.Z + B.Z);
   end;

   function "*" (A : Vector3; S : Float) return Vector3 is
   begin
      return (A.X * S, A.Y * S, A.Z * S);
   end;

   Position : Vector3 := (0.0, 0.0, 0.0);
   Velocity : Vector3 := (0.0, 0.0, 0.0);

   Flying   : Boolean := False;
   Speed    : Float   := 60.0;

   Input    : Character;

begin
   Put_Line("=== Ada Flight Simulation ===");
   Put_Line("F = toggle flight, WASD = move, Space = up, C = down, Q = quit");

   loop
      Put("Input: ");
      Get(Input);

      if Input = 'F' or else Input = 'f' then
         Flying := not Flying;
         if Flying then
            Put_Line("Flight enabled");
         else
            Put_Line("Flight disabled");
            Velocity := (0.0, 0.0, 0.0);
         end if;
      end if;

      if Flying then
         declare
            Move : Vector3 := (0.0, 0.0, 0.0);
         begin
            case Input is
               when 'W' | 'w' => Move.Z := Move.Z + 1.0;
               when 'S' | 's' => Move.Z := Move.Z - 1.0;
               when 'A' | 'a' => Move.X := Move.X - 1.0;
               when 'D' | 'd' => Move.X := Move.X + 1.0;
               when ' '       => Move.Y := Move.Y + 1.0; -- Space
               when 'C' | 'c' => Move.Y := Move.Y - 1.0;
               when others    => null;
            end case;

            Velocity := Move * Speed;
            Position := Position + Velocity * 0.016; -- simulate ~60 FPS
         end;
      end if;

      Put("Position => X: ");
      Put(Position.X, Fore => 1, Aft => 2, Exp => 0);
      Put("  Y: ");
      Put(Position.Y, Fore => 1, Aft => 2, Exp => 0);
      Put("  Z: ");
      Put(Position.Z, Fore => 1, Aft => 2, Exp => 0);
      New_Line;

      exit when Input = 'Q' or else Input = 'q';
   end loop;

   Put_Line("Simulation ended.");

end Flight_Sim;