require "optparse"
require "date"

module Post
  class Options
    attr_reader :input, :title, :date, :colorize

    def parse!
      @colorize = true
      OptionParser.new do |parser|
        parser.banner = "Usage: post.rb [options]"

        parser.on("--no-color", "Don't colorize output") do
          @colorize = false
        end

        parser.on("-n", "--today", "Set date as today") do
          @date = Date.today
        end

        parser.on("-d=DATE", "--date=DATE", "Set date") do |date|
          @date = Date.parse(date)
        end

        parser.on("-t=TITLE", "--title=TITLE", "Set the title/topic") do |title|
          @title = title
        end

        parser.on("-f=PATH", "--file=PAT", "Read a file as inut") do |path|
          @input = File.read(path)
        end

        parser.on("--stdin", "Read the input from stdin") do
          @input = nil
        end
      end.parse!

      if @title && @date
        raise "You may NOT choose a title AND a date"
      end

      fill_input!
      self
    end

    def fill_input!
      if !input
        input = ""
        while (line = $stdin.gets)
          input << line
        end
        @input = input
      end
      self
    end
  end
end