require "fileutils"
require_relative "../core_ext"

require "colorize"

module Post
  class Builder
    def initialize(options:)
      @options = options
    end

    def filepath
      @options.date ? _filepath_date : _filepath_title
    end

    private def _filepath_date
      "blog/posts/dates/#{@options.date}.md"
    end

    private def _filepath_title
      # topics_amount = File["blog/posts/topics/*"].size
      # "blog/posts/topics/#{topics_amount}.md"
      "blog/posts/topics/#{@options.title.slugify}.md"
    end

    def input_to_body
      @options.date ? _input_to_body_date : _input_to_body_title
    end

    private def _input_to_body_date
      @options.input
    end

    private def _input_to_body_title
      "# #{@options.title}\n\n#{@options.input}"
    end

    def write!
      String.disable_colorization true if !@options.colorize
      filepath = filepath()
      dirpath = File.dirname filepath
      FileUtils.mkdir_p dirpath

      new_body = input_to_body
      old_body = File.read(filepath) if File.exist?(filepath)
      body = [old_body, new_body].compact.join("\n---\n\n")

      # we could use "a" mode for optimisation but it's overkill
      File.write filepath, body
      puts "Wrote the file #{filepath}".green
      puts "Kept the content of the old post".yellow
      new_lines_amount = new_body.count "\n"
      puts "Wrote #{new_lines_amount} lines".yellow
    end
  end
end