# -*- coding: utf-8 -*-
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
      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.to_s.gsub(/^_/,'')
      camel_cased_word = camel_cased_word.gsub("__","_")

      # sanitize the string
      camel_cased_word = camel_cased_word.gsub(/[^a-z._0-9 -]/i, "").
        tr(".", "_").gsub(/(\s+)/, "_").gsub(/_/, '-').downcase
      camel_cased_word = camel_cased_word.to_s.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'] => 'e',
        ['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 and special characters
      conv = Iconv.new("ASCII//TRANSLIT//IGNORE", "UTF-8")
      str = conv.iconv(str)
      return str
    end

  end

end