with

    FLTK.Screen,
    FLTK.Event,
    Misc;


package body Displays is


    package WD renames FLTK.Widgets.Groups.Windows.Double;
    package B renames FLTK.Widgets.Boxes;




    function Create
           (X, Y, W, H : in Integer;
            Text       : in String)
        return Display
    is
        My_Width  : Integer := Misc.Max (Message_Box_Width, W);
        My_Height : Integer := Misc.Max (Message_Box_Height + Stat_Box_Height, H);
    begin
        return This : Display :=
                   (WD.Double_Window'(WD.Forge.Create (X, Y, My_Width, My_Height, Text)) with

                    Message_Box => B.Box'(B.Forge.Create
                        (0, 0, Message_Box_Width, Message_Box_Height, "")),
                    Level_Box => B.Box'(B.Forge.Create
                        (0, Message_Box_Height, Stat_Box_Width, Stat_Box_Height, "")),
                    Move_Box => B.Box'(B.Forge.Create
                        (Stat_Box_Width, Message_Box_Height, Stat_Box_Width, Stat_Box_Height, "")),
                    Current_Grid => null,
                    Key_Func => null,
                    Mouse_Func => null) do

            This.Add (This.Message_Box);
            This.Add (This.Level_Box);
            This.Add (This.Move_Box);
            This.Message_Box.Set_Label_Size (Text_Size);
            This.Level_Box.Set_Label_Size (Text_Size);
            This.Move_Box.Set_Label_Size (Text_Size);

            This.Set_Icon (Logo);
        end return;
    end Create;


    function Create
           (W, H : in Integer)
        return Display is
    begin
        return Create (0, 0, W, H, "Sokoban");
    end Create;


    function Create
        return Display is
    begin
        return Create (0, 0, Message_Box_Width, Message_Box_Height, "Sokoban");
    end Create;




    procedure Set_Grid
           (This : in out Display;
            To   : in out Grids.Grid) is
    begin
        if This.Current_Grid /= null then
            This.Remove (This.Current_Grid.all);
        end if;
        This.Current_Grid := To'Unchecked_Access;
        This.Add (To);
        This.Ensure_Correct_Size;
    end Set_Grid;


    procedure Adjust_Grid
           (This       : in out Display;
            Cols, Rows : in     Natural) is
    begin
        This.Current_Grid.Set_Cols (Cols);
        This.Current_Grid.Set_Rows (Rows);
        This.Ensure_Correct_Size;
    end Adjust_Grid;


    procedure Ensure_Correct_Size
           (This : in out Display)
    is
        New_Width : Integer :=
            Misc.Max (Message_Box_Width, This.Current_Grid.Get_W);
        New_Height : Integer :=
            Message_Box_Height + This.Current_Grid.Get_H + Stat_Box_Height;
        Grid_X : Integer :=
            Misc.Max (0, (Message_Box_Width - This.Current_Grid.Get_W) / 2);
    begin
        This.Current_Grid.Reposition (Grid_X, 0);
        This.Message_Box.Resize (New_Width, This.Message_Box.Get_H);
        This.Message_Box.Reposition (This.Message_Box.Get_X, This.Current_Grid.Get_H);
        This.Level_Box.Resize (New_Width / 2, This.Level_Box.Get_H);
        This.Level_Box.Reposition (0, New_Height - Stat_Box_Height);
        This.Move_Box.Resize (New_Width / 2, This.Move_Box.Get_H);
        This.Move_Box.Reposition (New_Width / 2, New_Height - Stat_Box_Height);
        This.Resize (New_Width, New_Height);
    end Ensure_Correct_Size;


    procedure Centre_On_Screen
           (This : in out Display)
    is
        use FLTK.Screen;
    begin
        This.Reposition
           (Get_X + (Get_W - This.Get_W) / 2,
            Get_Y + (Get_H - This.Get_H) / 2);
    end Centre_On_Screen;




    procedure Set_Message
           (This : in out Display;
            Msg  : in     String) is
    begin
        This.Message_Box.Set_Label (Msg);
    end Set_Message;


    procedure Set_Level_Number
           (This : in out Display;
            To   : in     Natural) is
    begin
        This.Level_Box.Set_Label ("Level:" & Natural'Image (To));
    end Set_Level_Number;


    procedure Set_Move_Number
           (This : in out Display;
            To   : in     Natural) is
    begin
        This.Move_Box.Set_Label ("Moves:" & Natural'Image (To));
    end Set_Move_Number;




    procedure Set_Keyboard_Callback
           (This : in out Display;
            Func : in     Keyboard_Callback) is
    begin
        This.Key_Func := Func;
    end Set_Keyboard_Callback;


    procedure Set_Mouse_Callback
           (This : in out Display;
            Func : in     Mouse_Callback) is
    begin
        This.Mouse_Func := Func;
    end Set_Mouse_Callback;




    function Handle
           (This  : in out Display;
            Event : in     FLTK.Event_Kind)
        return FLTK.Event_Outcome
    is
        use type FLTK.Event_Kind, FLTK.Event_Outcome;
    begin
        if  This.Key_Func /= null and then Event = FLTK.Keydown and then
            This.Key_Func (FLTK.Press (FLTK.Event.Last_Key)) = FLTK.Handled
        then
            return FLTK.Handled;

        elsif This.Mouse_Func /= null and then Event = FLTK.Release and then
            This.Mouse_Func (FLTK.Event.Mouse_X, FLTK.Event.Mouse_Y) = FLTK.Handled
        then
            return FLTK.Handled;

        else
            return WD.Double_Window (This).Handle (Event);
        end if;
    end Handle;


end Displays;