# frozen_string_literal: true

# Hash helpers
module Planter
  ## Hash helpers
  class ::Hash
    ## Turn all keys into string
    ##
    ## @return     [Hash] copy of the hash where all its keys are strings
    ##
    def stringify_keys
      each_with_object({}) do |(k, v), hsh|
        hsh[k.to_s] = if v.is_a?(Hash) || v.is_a?(Array)
                        v.stringify_keys
                      else
                        v
                      end
      end
    end

    ##
    ## Turn all keys into symbols
    ##
    ## @return [Hash] hash with symbolized keys
    ##
    def symbolize_keys
      each_with_object({}) do |(k, v), hsh|
        hsh[k.to_sym] = if v.is_a?(Hash) || v.is_a?(Array)
                          v.symbolize_keys
                        else
                          v
                        end
      end
    end

    ##
    ## Deep merge a hash
    ##
    ## @param      second  [Hash] The hash to merge into self
    ##
    def deep_merge(second)
      merger = proc do |_, v1, v2|
        if v1.is_a?(Hash) && v2.is_a?(Hash)
          v1.merge(v2, &merger)
        elsif v1.is_a?(Array) && v2.is_a?(Array)
          v1 | v2
        elsif [:undefined, nil, :nil].include?(v2)
          v1
        else
          v2
        end
      end
      merge(second.to_h, &merger)
    end

    ##
    ## Freeze all values in a hash
    ##
    ## @return     [Hash] Hash with all values frozen
    ##
    def deep_freeze
      chilled = {}
      each do |k, v|
        chilled[k] = v.is_a?(Hash) ? v.deep_freeze : v.freeze
      end

      chilled.freeze
    end

    ##
    ## Unfreeze a hash and all nested values
    ##
    ## @return     [Hash] unfrozen hash
    ##
    def deep_thaw
      chilled = {}
      each do |k, v|
        chilled[k] = v.is_a?(Hash) ? v.deep_thaw : v.dup
      end

      chilled.dup
    end
  end
end