module HelpReply

# File lib/help_reply.rb, line 22
def self.build_help_text(plugins_dir:, topic: nil, list_commands:)
  entries = list_commands.call(plugins_dir: plugins_dir)
  if topic && !topic.to_s.strip.empty?
    root = topic.to_s.strip.downcase.split(/\s+/, 2).first.to_s
    if HelpSections.section?(root)
      return build_help_text_for_section(root, entries: entries)
    end

    return build_help_text_for_topic(topic, entries: entries)
  end

  build_help_text_index(entries: entries)
end

# File lib/help_reply.rb, line 60
def self.build_help_text_for_section(section_id, entries:)
  matches = HelpSections.entries_for_section(section_id, entries: entries)
  return "No commands in #{section_id} section" if matches.empty?

  config = HelpSections.section_config(section_id)
  body = matches.map { |entry| format_entry(entry[:command], entry[:description]) }
  lines = [
    IrcFormat.report_header(tag: "HELP", title: config[:label], style: STYLE_TITLE),
    *body,
    IrcFormat.report_footer("#{matches.length} commands", "!help for sections")
  ]

  lines.join("\n")
end

# File lib/help_reply.rb, line 75
def self.build_help_text_for_topic(topic, entries:)
  root = topic.to_s.strip.downcase.split(/\s+/, 2).first.to_s
  matches = entries.select do |entry|
    command = entry[:command].to_s.downcase
    command == root || command.start_with?("#{root} ")
  end

  return "No help for !#{topic}" if matches.empty?

  body = matches.sort_by { |entry| entry[:command] }
                .map { |entry| format_entry(entry[:command], entry[:description]) }
  lines = [
    IrcFormat.report_header(tag: "HELP", title: "!#{root}", style: STYLE_TITLE),
    *body,
    IrcFormat.report_footer("#{matches.length} commands", "!help for sections")
  ]

  lines.join("\n")
end

# File lib/help_reply.rb, line 36
def self.build_help_text_index(entries:)
  grouped = HelpSections.group_entries(entries)
  if grouped.empty?
    return [
      IrcFormat.report_header(tag: "HELP", title: "Rabbot commands", style: STYLE_TITLE),
      "No commands found",
      AUTHOR_NOTE
    ].join("\n")
  end

  lines = [
    IrcFormat.report_header(tag: "HELP", title: "Rabbot commands", style: STYLE_TITLE),
    *HelpSections.section_index_lines(grouped),
    IrcFormat.report_footer(
      "#{entries.length} commands",
      "#{grouped.length} sections",
      "!help <section|command>"
    ),
    AUTHOR_NOTE
  ]

  lines.join("\n")
end

# File lib/help_reply.rb, line 13
def self.format_entry(command, description)
  description = description.to_s.strip
  if description.empty?
    "!#{command}"
  else
    "!#{command} - #{description}"
  end
end