class Chamomile::Renderer

# File lib/chamomile/renderer.rb, line 17
def initialize(output: $stdout, fps: 60)
  @output       = output
  @alt_screen   = false
  @inline       = false
  @width        = 80
  @height       = 24
  @prev_lines   = []
  @inline_lines = 0
  @mutex        = Mutex.new
  @fps          = fps
  @min_interval = fps.positive? ? 1.0 / fps : 0
  @last_render  = 0.0
  @pending_view = nil
  @timer_thread = nil
end

# File lib/chamomile/renderer.rb, line 111
def apply_cursor_shape(shape)
  code = case shape
         when :block          then 2
         when :underline      then 4
         when :bar            then 6
         when :blinking_block then 1
         when :blinking_underline then 3
         when :blinking_bar then 5
         else 0 # default
         end
  @output.write("\e[#{code} q")
end

# File lib/chamomile/renderer.rb, line 80
def clear
  @output.write(CLEAR_SCREEN)
  @output.flush
end

# File lib/chamomile/renderer.rb, line 33
def enter_alt_screen
  @output.write(ALT_SCREEN_ON)
  @alt_screen = true
  @inline = false
end

# File lib/chamomile/renderer.rb, line 44
def enter_inline_mode
  @inline = true
  @inline_lines = 0
end

# File lib/chamomile/renderer.rb, line 39
def exit_alt_screen
  @output.write(ALT_SCREEN_OFF)
  @alt_screen = false
end

# File lib/chamomile/renderer.rb, line 129
def force_render(view_output)
  view_string = resolve_view(view_output)
  @mutex.synchronize do
    flush_render(view_string)
    @last_render = Process.clock_gettime(Process::CLOCK_MONOTONIC)
    @pending_view = nil
    cancel_timer
  end
end

# File lib/chamomile/renderer.rb, line 49
def hide_cursor
  @output.write(HIDE_CURSOR)
end

# File lib/chamomile/renderer.rb, line 107
def move_cursor(row, col)
  @output.write("\e[#{row};#{col}H")
end

# File lib/chamomile/renderer.rb, line 85
def println(str)
  @output.puts(str)
end

# File lib/chamomile/renderer.rb, line 90
def println_above(str)
  @mutex.synchronize do
    if @inline && @inline_lines.positive?
      buf = +""
      buf << "\e[#{@inline_lines}A" # Move up
      buf << "\e[L" # Insert line
      buf << str
      buf << "\n"
      buf << "\e[#{@inline_lines}B" # Move back down
      @output.write(buf)
      @output.flush
    else
      @output.puts(str)
    end
  end
end

# File lib/chamomile/renderer.rb, line 62
def render(view_output)
  view_string = resolve_view(view_output)
  @mutex.synchronize do
    now = Process.clock_gettime(Process::CLOCK_MONOTONIC)
    elapsed = now - @last_render

    if elapsed >= @min_interval
      flush_render(view_string)
      @last_render = now
      @pending_view = nil
      cancel_timer
    else
      @pending_view = view_string
      schedule_timer(@min_interval - elapsed)
    end
  end
end

# File lib/chamomile/renderer.rb, line 57
def resize(width, height)
  @width  = width
  @height = height
end

# File lib/chamomile/renderer.rb, line 53
def show_cursor
  @output.write(SHOW_CURSOR)
end

# File lib/chamomile/renderer.rb, line 139
def stop
  @mutex.synchronize do
    cancel_timer
  end
end

# File lib/chamomile/renderer.rb, line 124
def write_window_title(title)
  @output.write("\e]2;#{title}\a")
end