module ThemePaintRules

# File lib/theme_paint_rules.rb, line 56
def auto_rules(plugin:, palette:)
  lines = PaintSamples.lines(plugin)
  return [] unless lines && !lines.empty?

  rules = []
  lines.each_with_index do |line, idx|
    line_num = idx + 1
    IrcPaint.segments(line).each do |segment|
      role = classify_segment(segment[:text], line_num: line_num, total_lines: lines.length)
      next unless role

      rule = { plugin: plugin.to_s, line: line_num, pos: segment[:plain_start], fg: role_fg(role, palette) }
      bg = role_bg(role, palette)
      rule[:bg] = bg if bg
      rules << rule
    end
  end
  dedupe_rules(rules)
end

# File lib/theme_paint_rules.rb, line 76
def classify_segment(text, line_num:, total_lines:)
  plain = text.to_s
  return :tag if plain.include?("«") || plain.include?("»")
  return :title if plain.include?("-=//") || plain.include?("\\=-")
  return :footer if line_num == total_lines && plain.start_with?("(")

  nil
end

# File lib/theme_paint_rules.rb, line 98
def dedupe_rules(rules)
  rules.uniq { |rule| [rule[:plugin], rule[:line], rule[:pos]] }
end

# File lib/theme_paint_rules.rb, line 14
def first_block_pos(line)
  segment = IrcPaint.segments(line).first
  segment ? segment[:plain_start] : nil
end

# File lib/theme_paint_rules.rb, line 19
def irc_card_rules(plugin:, title_fg:, title_bg: nil, tag_fg: nil, tag_bg: nil, footer_fg: nil, footer_bg: nil)
  lines = PaintSamples.lines(plugin)
  return [] unless lines && !lines.empty?

  rules = []
  tag_pos = first_block_pos(lines[0])
  if tag_pos
    tag_rule = { plugin: plugin.to_s, line: 1, pos: tag_pos, fg: tag_fg || 9 }
    tag_rule[:bg] = tag_bg if tag_bg
    rules << tag_rule
  end

  if lines.length >= 2
    title_pos = first_block_pos(lines[1])
    if title_pos
      title_rule = { plugin: plugin.to_s, line: 2, pos: title_pos, fg: title_fg }
      title_rule[:bg] = title_bg if title_bg
      rules << title_rule
    end
  end

  if lines.length >= 3
    footer_pos = first_block_pos(lines[-1])
    if footer_pos
      footer_rule = { plugin: plugin.to_s, line: lines.length, pos: footer_pos, fg: footer_fg || 14 }
      footer_rule[:bg] = footer_bg if footer_bg
      rules << footer_rule
    end
  end

  rules
end

# File lib/theme_paint_rules.rb, line 52
def merge_for_palette(plugins, palette:)
  Array(plugins).flat_map { |plugin| auto_rules(plugin: plugin, palette: palette) }
end

# File lib/theme_paint_rules.rb, line 103
def progress_gutter_rules(palette:)
  lines = PaintSamples.lines("progress")
  return [] unless lines && !lines.empty?

  merged = palette.merge(
    progress_percent: palette[:progress_percent] || [11, 2]
  )

  fg, bg = merged[:progress_percent]
  [{ plugin: "progress", line: 1, pos: 1, fg: fg, bg: bg }]
end

# File lib/theme_paint_rules.rb, line 92
def role_bg(role, palette)
  pair = Array(palette[role] || palette[:title] || [0, 4])
  pair.length == 2 ? pair[1] : nil
end

# File lib/theme_paint_rules.rb, line 86
def role_fg(role, palette)
  pair = Array(palette[role] || palette[:title] || [0, 4])
  pair[0]
end