class OrganicHash

# File lib/organic_hash.rb, line 38
def self.hash(str, array = false)
  OrganicHash.new.hash str, array
end

# File lib/organic_hash.rb, line 12
def initialize(length = 3, delimiter = "-", hasher = Digest::SHA1, noun = NOUN, adj = ADJ, adv = ADV)
  @length = [1, [5, length].min].max
  @delimiter = delimiter
  @hasher = hasher
  @noun = noun
  @adj = adj
  @adv = adv
end

# File lib/organic_hash.rb, line 42
def self.rand(array = false)
  OrganicHash.new.rand array
end

# File lib/organic_hash.rb, line 21
def hash(str, array = false)
  indexes = str2indexes str

  noun_idx = indexes.pop
  adjs, advs = indexes.partition.with_index { |_, i| i.even? }
  adjs = adjs.map { |i| @adj[i % @adj.length] }
  advs = advs.map { |i| @adv[i % @adv.length] }

  output = adjs.zip(advs).map(&:reverse).flatten.reject(&:nil?) + [@noun[noun_idx % @noun.length]]

  array ? output : output.join(@delimiter)
end

# File lib/organic_hash.rb, line 34
def rand(array = false)
        hash SecureRandom.hex, array
end

# File lib/organic_hash.rb, line 47
def str2indexes(hex)
  sha1 = @hasher.hexdigest hex
  seg = sha1.length / @length
  rem = sha1.length % @length

  0.upto(@length - 1).map { |i| sha1[seg*i...seg*(i+1)].to_i(16) }
end