# -*- coding: utf-8 -*-
require 'cgi'
require 'iconv'

module Vortex

  "String utilities"

  class StringUtils

    # Turn a normal sentence into a valid, readable filename.
    #
    # Example:
    #
    #    "A small test" => "a-small-test.html"
    def self.create_filename(sentence)
      if(sentence.size > 10)then
        truncated_title = sentence.sub(/:.*/,"").sub(/;/,"").sub(/&/,"").sub(/\(/,"").sub(/\)/,"")
        html_filename = self.snake_case(truncated_title)
      else
        html_filename = self.snake_case(sentence)
      end

      # Just keep the 100 first chars, to nearest word.
      if(html_filename.size > 100)then
        html_filename = html_filename.gsub(/\.html$/,"")
        html_filename = html_filename[0..100]
        html_filename = html_filename.gsub(/_[^_]*$/,"") + ".html"
      end

      html_filename = html_filename.gsub("!","")
      html_filename = html_filename.sub(/^_/, "")
      html_filename = html_filename.gsub("»", "")
      html_filename = html_filename.gsub("%", "")

      h1 = html_filename
      html_filename = CGI::escape(html_filename) # URLencode just to be safe
      if(html_filename != h1)
        warn "create_filename_from_title() could not create a valid filename " + html_filename
      end
      return html_filename
    end

    def self.snake_case(camel_cased_word_input)
      camel_cased_word = camel_cased_word_input + "" # create local copy of string
      camel_cased_word = remove_accents(camel_cased_word)
      camel_cased_word = camel_cased_word.to_s.gsub(/::/, '/').
        gsub(/([A-Z]+)([A-Z][a-z])/,'\1\2').
        gsub(/([a-z\d])([A-Z])/,'\1\2').downcase
      camel_cased_word = camel_cased_word.to_s.gsub(/ /,'-')
      camel_cased_word = camel_cased_word.gsub(/_+/,"_")

      camel_cased_word = camel_cased_word.gsub(/\//,"_")
      camel_cased_word = camel_cased_word.gsub(/\?/,"")

      camel_cased_word = camel_cased_word.gsub(/\(.*\)/,"")
      camel_cased_word = camel_cased_word.gsub(/'/,"")
      camel_cased_word = camel_cased_word.gsub(/:/,"")
      camel_cased_word = camel_cased_word.gsub(/\./,"")    # Dot's ('.') don't look good in url's
      camel_cased_word = camel_cased_word.gsub(",","")     # Commas don't look good in url's
      camel_cased_word = camel_cased_word.gsub(/"/,"")     # and not '"' either
      camel_cased_word = camel_cased_word.gsub("§","")     # Paragraps are no good
      camel_cased_word = camel_cased_word.gsub("__","_")
      return camel_cased_word
    end


    # Filter accents and some special characters
    def self.remove_accents(str)
      accents = { ['á','à','â','ä','ã','Ã','Ä','Â','À'] => 'a',
        ['é','è','ê','ë','Ë','É','È','Ê'] => 'e',
        ['í','ì','î','ï','I','Î','Ì'] => 'i',
        ['ó','ò','ô','ö','õ','Õ','Ö','Ô','Ò'] => 'o',
        ['œ'] => 'oe',
        ['ß'] => 'ss',
        ['ú','ù','û','ü','U','Û','Ù'] => 'u',
        ['æ'] => 'ae',
        ['ø'] => 'o',
        ['å'] => 'a',
        ['Æ'] => 'ae',
        ['Ø'] => 'o',
        ['Å'] => 'a',
      }
      accents.each do |ac,rep|
        ac.each do |s|
          str.gsub!(s, rep)
        end
      end

      # Remove the rest of the accents
      conv = Iconv.new("ASCII//TRANSLIT", "UTF-8")
      str = conv.iconv(str)
      return str
    end

  end

end