module ThemeFrame

# File lib/theme_frame.rb, line 57
def coloured_doodles(theme, which)
  return [] unless theme.dig(:frame, which)

  seed = theme[:id].to_s.bytes.sum
  doodle_lines(theme, which).each_with_index.map do |line, index|
    text = line.to_s.gsub("TAG", theme[:name].to_s.upcase)
    if theme[:doodle_style] == :rainbow
      ThemeDoodle.rainbow_line(text, line_index: index, seed: seed)
    elsif theme[:doodle_style] == :matrix
      ThemeDoodleMatrix.matrix_line(text, line_index: index, seed: seed)
    else
      style = palette_style(theme.dig(:palette, :accent) || theme.dig(:palette, :title) || [14])
      IrcFormat.decorate(text, style)
    end
  end
end

# File lib/theme_frame.rb, line 34
def doodle_lines(theme, which = :header_doodle)
  Array(theme.dig(:frame, which))
end

# File lib/theme_frame.rb, line 38
def heading_style(theme)
  palette_style(theme.dig(:palette, :title) || [0, 4])
end

# File lib/theme_frame.rb, line 49
def palette_style(pair)
  codes = Array(pair)
  return IrcFormat.color(codes[0]) if codes.length == 1

  IrcFormat.color(codes[0], codes[1])
end

# File lib/theme_frame.rb, line 19
def preview(theme)
  lines = []
  lines.concat(coloured_doodles(theme, :header_doodle))
  lines.concat(coloured_doodles(theme, :between_doodles))
  lines << IrcReply.card(
    tag: TAG,
    title: theme[:name].to_s,
    body_lines: [SAMPLE_BODY, styled_separator(theme)],
    footer_parts: [theme[:id].to_s, width_label(theme[:width])],
    heading_style: heading_style(theme)
  )
  lines.concat(coloured_doodles(theme, :footer_doodle))
  lines.join("\n")
end

# File lib/theme_frame.rb, line 42
def styled_separator(theme)
  sep = theme.dig(:frame, :separator).to_s
  return sep if sep.empty?

  IrcFormat.decorate(sep, palette_style(theme.dig(:palette, :accent) || theme.dig(:palette, :title) || [14]))
end

# File lib/theme_frame.rb, line 74
def width_label(width)
  case width
  when :narrow then "narrow"
  when :wide then "wide"
  else "medium"
  end
end