module RabbotMetaColorsReport

# File lib/rabbot_meta_colors_report.rb, line 43
def format_code(code)
  hex = IrcExtendedColors.rgb(code)
  group = IrcExtendedColors.group(code)
  swatch = IrcExtendedColors.swatch(code)

  IrcReply.card(
    tag: IRC_TAG,
    title: "Colour #{code}",
    body_lines: [
      "#{swatch} #{code} · ##{hex} · #{IrcExtendedColors.group_label(group)}",
      "Control code: \\003#{code.to_s.rjust(2, '0')}"
    ],
    footer_parts: ["extended colour", "ircdocs.horse"],
    heading_style: STYLE_TITLE
  )
end

# File lib/rabbot_meta_colors_report.rb, line 112
def format_group(name)
  codes = IrcExtendedColors.codes_for_group(name)
  label = IrcExtendedColors.group_label(name)
  body = codes.each_slice(SWATCHES_PER_LINE).take(MAX_GROUP_BODY_LINES).map do |slice|
    slice.map { |code| "#{IrcExtendedColors.swatch(code)}#{code}" }.join(" ")
  end

  IrcReply.card(
    tag: IRC_TAG,
    title: "Group — #{label}",
    body_lines: body,
    footer_parts: ["#{codes.first}–#{codes.last}", "#{codes.length} colours"],
    heading_style: STYLE_TITLE
  )
end

# File lib/rabbot_meta_colors_report.rb, line 23
def format_help
  group_lines = IrcExtendedColors::GROUPS.map do |name, codes|
    "— #{name} — #{codes.first}–#{codes.last} (#{codes.length} fixed colours)"
  end

  IrcReply.card(
    tag: IRC_TAG,
    title: "Extended mIRC colours",
    body_lines: [
      "Fixed RGB palette 16–98 (same for all IRC users). Theme colours 0–15 vary by client.",
      *group_lines,
      "Named pairs: !rabbot colors pairs · !rabbot colors title",
      "Themes: !rabbot colors themes · !rabbot colors neon · !rabbot colors spectrum",
      "Usage: !rabbot colors · !rabbot colors 52 · !rabbot colors 59,88 · !rabbot colors vivid"
    ],
    footer_parts: ["mIRC extended palette", "16–98"],
    heading_style: STYLE_TITLE
  )
end

# File lib/rabbot_meta_colors_report.rb, line 86
def format_named_pair(name, fg, bg)
  format_pair(fg, bg, name: name)
end

# File lib/rabbot_meta_colors_report.rb, line 60
def format_pair(fg, bg, name: nil)
  swatch = IrcExtendedColors.swatch(fg, bg: bg)
  fg_hex = IrcExtendedColors.extended?(fg) ? "##{IrcExtendedColors.rgb(fg)}" : "theme"
  bg_hex = IrcExtendedColors.extended?(bg) ? "##{IrcExtendedColors.rgb(bg)}" : "theme"
  title = if name
            "Pair — #{name} (#{fg},#{bg})"
          else
            "Colour pair #{fg},#{bg}"
          end
  body = [
    "#{swatch} Sample text",
    "fg #{fg} #{fg_hex} · bg #{bg} #{bg_hex}",
    "Contrast: #{pair_contrast_hint(fg, bg)}"
  ]
  role = name ? IrcExtendedColors.pair_role(name) : nil
  body.insert(1, "Role: #{role}") if role

  IrcReply.card(
    tag: IRC_TAG,
    title: title,
    body_lines: body,
    footer_parts: ["fg,bg preview", "IrcFormat.color"],
    heading_style: STYLE_TITLE
  )
end

# File lib/rabbot_meta_colors_report.rb, line 90
def format_pairs_list
  rows = IrcExtendedColors.pair_names.map do |name|
    fg, bg = IrcExtendedColors.resolve_pair(name)
    swatch = IrcExtendedColors.swatch(fg, bg: bg)
    extended = IrcExtendedColors.pair_extended?(name) ? "fixed" : "theme"
    {
      label: name.to_s,
      value: "#{swatch}#{fg},#{bg} (#{extended})"
    }
  end
  body = TextAlign.format_colon_rows(rows).take(MAX_PAIRS_BODY_LINES)
  total = IrcExtendedColors.pair_names.length

  IrcReply.card(
    tag: IRC_TAG,
    title: "Named colour pairs",
    body_lines: body,
    footer_parts: ["#{total} pairs", "!rabbot colors title"],
    heading_style: STYLE_TITLE
  )
end

# File lib/rabbot_meta_colors_report.rb, line 128
def pair_contrast_hint(fg, bg)
  fg = fg.to_i
  bg = bg.to_i
  return "invisible (same fg and bg)" if fg == bg
  return "readable (vivid fg on dark bg)" if (52..63).cover?(fg) && (88..92).cover?(bg)
  return "readable (dark fg on light bg)" if (88..89).cover?(fg) && (96..98).cover?(bg)

  "check on your client"
end