module Intent
  module Review
    class Commands < Intent::CommandDispatcher
      def run(args, output=STDOUT)
        if args.empty?
          launch_densityplot
        else
          print_help(output)
        end
      end

      def launch_densityplot
        UnicodePlot.barplot(data: {'calyx': 20, 'fictive': 50}, title: "Projects").render
      end

      def launch_ui_loop
        list = Todo::List.new(ENV['TODO_TXT'])

        box = TTY::Box.frame(
          width: TTY::Screen.width,
          height: TTY::Screen.height-1,
          align: :center,
          border: :thick,
          style: {
            fg: :bright_yellow,
            border: {
              fg: :white,
            }
          }
        )
        
        focus_index = 0
        
        def truncate(str, width)
          return str unless str.length >= width
        
          "#{str.slice(0, width-3)}..."
        end
        
        def draw_card(top, item, focus)
        
          style = unless top == focus
            { fg: :white, border: { fg: :white } }
          else
            { fg: :bright_white, border: { fg: :bright_magenta, bg: :black } }
          end
        
          title = if top == focus
            {bottom_right: "[x: close][enter: launch]"}
          else
            {}
          end
        
          #pastel = Pastel.new
          width = 90
        
          TTY::Box.frame(width: width, height: 4, left: 4, title: title, border: :thick, style: style) do
            "\s#{truncate(item[:title], 88)}\n\s#{truncate(item[:href], 88)}"
          end
        end
        
        items_per_page = (TTY::Screen.height-1) / 4
        
        items = list.by_not_done.by_context("@reading").slice(0, items_per_page).map do |item|
          { title: item.text, href: item.text }
        end
        
        $cursor = TTY::Cursor
        print $cursor.hide
        
        def draw_list(items, focus)
          buffer = []
          items.each_with_index do |item, i|
            buffer << draw_card(i, item, focus)
          end
          result = buffer.join("")
        
          print $cursor.clear_screen + $cursor.move_to(0,0)
          print result
        end
        
        draw_list(items, focus_index)
        
        reader = TTY::Reader.new(interrupt: :exit)
        
        reader.on(:keyctrl_x, :keyescape) do
          print $cursor.clear_screen + $cursor.move_to(0,0)
          print $cursor.show
          exit
        end
        
        reader.on(:keytab, :keydown) do
          if focus_index == items.count - 1
            focus_index = 0
          else
            focus_index += 1
          end
          draw_list(items, focus_index)
        end
        
        reader.on(:keyup) do
          if focus_index == 0
            focus_index = items.count - 1
          else
            focus_index -= 1
          end
          draw_list(items, focus_index)
        end
        
        reader.on(:keypress) do |key|
          if key.value == "x"
            items.delete_at(focus_index)
            focus_index -= 1 if focus_index >= items.count
            draw_list(items, focus_index)
          end
        end
        
        reader.on(:keyenter) do
          `chrome-cli open #{items[focus_index][:href]}`
        end
        
        loop do
          reader.read_line(echo: false)
        end
      end
    end
  end
end