class ActiveRecord::Encryption::Scheme

def compatible_with?(other_scheme)
  deterministic? == other_scheme.deterministic?
end

def default_key_provider
  ActiveRecord::Encryption.key_provider
end

def deterministic?
  !!@deterministic
end

def deterministic_key_provider
  @deterministic_key_provider ||= if @deterministic
    DeterministicKeyProvider.new(ActiveRecord::Encryption.config.deterministic_key)
  end
end

def downcase?
  @downcase
end

def fixed?
  # by default deterministic encryption is fixed
  @fixed ||= @deterministic && (!@deterministic.is_a?(Hash) || @deterministic[:fixed])
end

def ignore_case?
  @ignore_case
end

def initialize(key_provider: nil, key: nil, deterministic: nil, support_unencrypted_data: nil, downcase: nil, ignore_case: nil,
               previous_schemes: nil, compress: true, compressor: nil, **context_properties)
  # Initializing all attributes to +nil+ as we want to allow a "not set" semantics so that we
  # can merge schemes without overriding values with defaults. See +#merge+
  @key_provider_param = key_provider
  @key = key
  @deterministic = deterministic
  @support_unencrypted_data = support_unencrypted_data
  @downcase = downcase || ignore_case
  @ignore_case = ignore_case
  @previous_schemes_param = previous_schemes
  @previous_schemes = Array.wrap(previous_schemes)
  @context_properties = context_properties
  @compress = compress
  @compressor = compressor
  validate_config!
  @context_properties[:encryptor] = Encryptor.new(compress: @compress) unless @compress
  @context_properties[:encryptor] = Encryptor.new(compressor: compressor) if compressor
end

def key_provider
  @key_provider_param || key_provider_from_key || deterministic_key_provider || default_key_provider
end

def key_provider_from_key
  @key_provider_from_key ||= if @key.present?
    DerivedSecretKeyProvider.new(@key)
  end
end

def merge(other_scheme)
  self.class.new(**to_h.merge(other_scheme.to_h))
end

def support_unencrypted_data?
  @support_unencrypted_data.nil? ? ActiveRecord::Encryption.config.support_unencrypted_data : @support_unencrypted_data
end

def to_h
  { key_provider: @key_provider_param, deterministic: @deterministic, downcase: @downcase, ignore_case: @ignore_case,
    previous_schemes: @previous_schemes_param, **@context_properties }.compact
end

def validate_config!
  raise Errors::Configuration, "ignore_case: can only be used with deterministic encryption" if @ignore_case && !@deterministic
  raise Errors::Configuration, "key_provider: and key: can't be used simultaneously" if @key_provider_param && @key
  raise Errors::Configuration, "compressor: can't be used with compress: false" if !@compress && @compressor
  raise Errors::Configuration, "compressor: can't be used with encryptor" if @compressor && @context_properties[:encryptor]
end

def with_context(&block)
  if @context_properties.present?
    ActiveRecord::Encryption.with_encryption_context(**@context_properties, &block)
  else
    block.call
  end
end