program driver
use appgraphics
use appgraphics_filo
use filo
implicit none

    type(apEditorConfig)::E
    integer::mywindow
    integer::key, delta, rowoff
    logical::cursor_moved
    
    mywindow = initwindow(640, 480, dbflag=.true., closeflag=.true.)
    
    call settextstyle(MONOSPACE_FONT, HORIZ_DIR, 20)
    call setfillstyle(SOLID_FILL, WHITE)
    
    E = initApEditor(mywindow)
    
    if(.not. editorOpen(E, "kilo.c")) then
        Print *, "Error opening file..."
        stop
    end if
    
    call drawApEditor(E)
    call swapbuffers()
    
    do while(.true.)
        call startidle(50)
        do while(kbhit()) 
            cursor_moved = .false.
            rowoff = E%rowoff
        
            key = getch()
            ! Special character
            if(key == 0) then
                key = getch()
                delta = 0
                select case(key)
                    case(KEY_UP)
                        E%cy = max(E%cy - 1, 1)
                        cursor_moved = .true.
                    case(KEY_DOWN)
                        E%cy = min(E%cy + 1, E%screenrows)
                        cursor_moved = .true.
                    case(KEY_LEFT)
                        E%cx = E%cx - 1
                        if(E%cx < 0) then
                            E%cx = 0
                            E%coloff = min(E%coloff + 1, 0)
                        end if
                        cursor_moved = .true.
                    case(KEY_RIGHT)
                        E%cx = E%cx + 1
                        
                        Print *, E%cx, E%cy, E%rowoff, E%coloff
                        
                        if(E%cx > E%screencols) then
                            E%coloff = E%coloff - 1
                            E%cx = E%cx - 1
                        end if
                        cursor_moved = .true.
                    case(KEY_PGUP)
                        delta = -1*E%screenrows
                    case(KEY_PGDN)
                        delta = E%screenrows
                end select
                
                rowoff = rowoff + delta
                rowoff = max(rowoff, 0)
                rowoff = min(rowoff, E%numrows - E%screenrows)
            else

                select case(key)
                    case(8) ! Backspace
                        call editorDelChar(E)
                    case default
                        call editorInsertChar(E, char(key))
                end select
                
                cursor_moved = .TRUE.
                
            end if
            
            if(rowoff /= E%rowoff .or. cursor_moved) then
                e%rowoff = rowoff
                call drawApEditor(E)
                call swapbuffers()
            end if
            
        end do
    end do
    
end program driver