arkency/rails_event_store

# frozen_string_literal: true

require "date"
require "time"
require "forwardable"

module RubyEventStore
  class Metadata
    include Enumerable
    extend Forwardable

    def initialize(h = self)
      @h = {}
      h.each { |k, v| self[k] = (v) }
    end

    def [](key)
      raise ArgumentError unless Symbol === key
      @h[key]
    end

    def []=(key, val)
      raise ArgumentError unless allowed_types.any? { |klass| klass === val }
      raise ArgumentError unless Symbol === key
      @h[key] = val
    end

    def each(&block)
      @h.each(&block)
    end

    SAFE_HASH_METHODS = %i[
      <
      <=
      >
      >=
      assoc
      clear
      compact
      compact!
      delete
      delete_if
      dig
      each_key
      each_pair
      each_value
      empty?
      fetch
      fetch_values
      flatten
      has_key?
      has_value?
      keep_if
      key
      key?
      keys
      length
      rassoc
      reject!
      select!
      shift
      size
      slice
      to_proc
      transform_keys
      transform_values
      value?
      values
      values_at
    ]

    delegate SAFE_HASH_METHODS => :@h

    private

    def allowed_types
      [String, Integer, Float, Date, Time, TrueClass, FalseClass, nil, Hash, Array]
    end

    private_constant :SAFE_HASH_METHODS
  end
end