class List_Win
  def initialize(inifile)
    @params = inifile
    @win = Ncurses::WINDOW.new(0, Ncurses.COLS()/4, 0, 0)
    @win.border(*([0]*8))
    @win.keypad(true)
    @win.timeout(1000)
    @win.refresh()
    @entry = 0
  end

  def getch()
    @win.getch()
  end
  def clear()
    @win.clear()
  end
  def resize(x,y)
    @win.resize(x,y)
  end
  def move(x,y)
    @win.move(x,y)
  end
  def refresh()
    @win.refresh()
  end

  def print_list(entry=nil)
    if(not entry.nil?)
      @entry = entry
    end
    i = 0
    @params.each_section do |section|
      if(@entry == i)
        @win.attron(Ncurses::A_REVERSE)
      end
      @win.move(i+1,1)
      print_line(@win,@params[section]['Name'])
      if(@entry == i)
        @win.attroff(Ncurses::A_REVERSE)
      end
      i = i+1
    end
    @win.border(*([0]*8))
    @win.move(0,3)
    @win.addstr("Menu")
    @win.refresh()
  end
end

class Buff_Win
  def initialize(winsize,winpos,params)
    @params = params
    @win = Ncurses::WINDOW.new(0, winsize, 0, winpos)
    @panel = Ncurses::Panel::PANEL.new(@win)
    if(@params['Type'] == 'oneshot')
      @buffer = Buffer.new(0)
    else
      @buffer = Buffer.new(@params['Buffer'].to_i)
    end
    @proc = nil
    @curr_offset = 0
    @hscroll = 0
    update_date()

    spawn_proc()
    print_buffer()
  end

  def move_resize(winsize,winpos)
    newwin = Ncurses::WINDOW.new(0, winsize, 0, winpos)
    Ncurses::Panel.replace_panel(@panel, newwin)
    Ncurses.delwin(@win)
    @win = newwin
    print_buffer()
  end
  def update_date()
    @last_update = Time.now
    @date = @last_update.strftime("%F %R:%S")
  end

  def win_border()
    @win.border(*([0]*8))
    win_header()
  end
  def win_header()
    @win.move(0,3)
    @win.addnstr(@params['Name'],@win.getmaxx-@date.length-10)
    @win.move(0,@win.getmaxx-@date.length-2)
    @win.addstr(@date)
  end
  def refresh()
    @win.refresh()
  end
  def clear()
    @win.clear()
  end

  def show_win()
    Ncurses::Panel.top_panel(@panel)
    Ncurses::Panel.update_panels
  end

  def hscroll(scroll=0)
    @hscroll += scroll
    if(@hscroll < 0)
      @hscroll = 0
    end
    if(@hscroll > @buffer.maxlen()-@win.getmaxx+3)
      @hscroll = @buffer.maxlen()-@win.getmaxx+3
    end
    print_buffer()
    refresh()
  end
  def scroll(scroll=0,goto=nil,fact=nil)
    if (not fact.nil?)
      scroll = (fact * @win.getmaxy.to_f).to_i
    elsif (not goto.nil?)
      @curr_offset = (goto * @buffer.size()).to_i
      scroll = 0
    end
    #@curr_offset -= @win.getmaxy/2
    @curr_offset += scroll
    if(@curr_offset < 0)
      @curr_offset = 0
    end
    if(@curr_offset > @buffer.size()-@win.getmaxy+2)
      @curr_offset = @buffer.size()-@win.getmaxy+2
    end
    print_buffer()
    refresh()
  end

  def print_buffer()
    #clear()
    win_border()
    j = 1
    @buffer.yield(@win.getmaxy-2,@curr_offset) { |l,type|
      @win.move(j,1)
      if(type == 1) then @win.attron(Ncurses.COLOR_PAIR(1)) end
      print_line(@win,l,hscroll=@hscroll)
      if(type == 1) then @win.attroff(Ncurses.COLOR_PAIR(1)) end
      j = j+1
    }
    if(@buffer.has_before?)
      @win.move(2,@win.getmaxx-1)
      @win.attron(Ncurses::A_REVERSE)
      @win.addstr("↑")
      @win.attroff(Ncurses::A_REVERSE)
    end
    if(@buffer.has_after?)
      @win.move(@win.getmaxy-2,@win.getmaxx-1)
      @win.attron(Ncurses::A_REVERSE)
      @win.addstr("↓")
      @win.attroff(Ncurses::A_REVERSE)
    end
  end

  def proc_readlines()
    begin
      while true
        @buffer.push(@proc.readline_nonblock)
        update_date()
      end
    rescue IO::WaitReadable
    end
  end

  def update(force=false)
    if(@params['Type'] == 'continuous')
      proc_readlines()
    end
    if(@params['Type'] == 'oneshot')
      if(force or (Time.now - @last_update > @params['Periodic'].to_i))
        @buffer.clear()
        spawn_proc()
        clear()
      end
    end
    print_buffer()
  end

  def spawn_proc()
    if(@params['Type'] == 'oneshot')
      update_date()
      Open3.popen3(@params["Command"]) { |i,o,e,t|
        while ((not o.eof?) or (not e.eof?))
          rs = IO.select([o,e],nil)[0]
          r = (rs[0].eof?)? rs[1] : rs[0]

          if r.fileno == o.fileno
            @buffer.push(r.readline)
          elsif r.fileno == e.fileno
            @buffer.push(r.readline,type=1)
          end
        end
      }
    elsif(@params['Type'] == 'continuous')
      @proc = IO.popen(@params["Command"])
      proc_readlines()
    end
  end
end