# frozen_string_literal: true

# lib/todo_marker.rb
require 'todo_marker/version'
require 'find'

module TodoMarker
  TODO_REGEX = /# !!TODO!!(?: style: (\w+))? "(.*?)"/
  STYLE_REGEX = /`style: (\w+?)` (.*?)`/
  STYLES = {
    'title' => '## %s',
    'title1' => '# %s',
    'sublist' => '  - %s',
    'super-text' => '<sup>%s</sup>',
    'sub-text' => '<sub>%s</sub>'
  }.freeze

  def self.generate_todo_md(directory)
    todos = []

    Find.find(directory) do |path|
      next unless path.end_with?('.rb')

      File.readlines(path).each_with_index do |line, index|
        next unless line.match(TODO_REGEX)

        style, message = line.match(TODO_REGEX).captures
        message = parse_styles(message)
        todos << {
          style:,
          message:,
          file: path,
          line: index + 1
        }
      end
    end

    create_todo_file(directory, todos)
  end

  def self.parse_styles(message)
    while message.match?(STYLE_REGEX)
      message.gsub!(STYLE_REGEX) do
        style, text = Regexp.last_match.captures
        STYLES[style] % text
      end
    end
    message
  end

  def self.create_todo_file(directory, todos)
    File.open(File.join(directory, 'TODO.md'), 'w') do |file|
      file.puts "# TODO List\n\n"
      previous_style = nil
      todos.each do |todo|
        formatted_message = format_message(todo[:style], todo[:message])
        file.puts formatted_message
        file.puts "  (#{todo[:file]}:#{todo[:line]})" if todo[:style] != 'sublist' && todo[:style].nil?
        previous_style = todo[:style]
      end
    end
  end

  def self.format_message(style, message)
    if style
      if style == 'sublist'
        "  - #{message}"
      else
        STYLES[style] % message
      end
    else
      "- #{message}"
    end
  end
end