module MailExtract
  class Line
    attr_reader :body, :type
    
    PATTERNS = {
      /^[>]+\s?/    => :quote,
      /^--/         => :signature,
      /^-- /        => :signature,
      /^[_]{2,}\n?/ => :signature,
      /^[-]{2,}\n?/ => :signature
    }
    
    def initialize(str)
      @body = str
      detect_type(str)
    end
    
    private
    
    def detect_type(line)
      # Detects the start line of quote text
      if line.strip =~ /^On/ && line =~ /at [\d:]+/ && line.strip =~ /wrote:?\z/
        @type = :quote
        return
      end
      
      @type = :text
      PATTERNS.each_pair do |p,t|
        if line =~ p
          @type = t
          break
        end
      end
    end
  end
end