require_relative '../data_conversion'

module Ccrypto
  class SecretKey
    include Java::DataConversion

    def initialize(algo, keysize, key)
      @algo = algo
      @keysize = keysize
      @native_key = key
      @native_key = to_jce_secret_key
    end

    def to_jce_secret_key
      case @native_key
      when javax.crypto.spec.SecretKeySpec
        @native_key
      when ::Java::byte[]
        javax.crypto.spec.SecretKeySpec.new(@native_key, @algo.to_s)

      when String
        javax.crypto.spec.SecretKeySpec.new(to_java_bytes(@native_key), @algo.to_s)

      else
        case @native_key.ccrypto_key
        when javax.crypto.spec.SecretKeySpec
          @native_key.ccrypto_key
        when ::Java::byte[]
          javax.crypto.spec.SecretKeySpec.new(@native_key.ccrypto_key, @algo.to_s)
        when Ccrypto::SecretKey
          @native_key.ccrypto_key.native_key
        else
          raise Ccrypto::Error, "Unknown key to conver to jce #{@native_key.ccrypto_key}"
        end
      end
    end

    def to_bin
      case @native_key
      when javax.crypto.spec.SecretKeySpec
        @native_key.encoded
      else
        raise Ccrypto::Error, "Unsupported key type #{@native_key.class}"
      end
    end

    def length
      case @native_key
      when javax.crypto.spec.SecretKeySpec
        @native_key.encoded.length
      when ::Java::byte[], String
        @native_key.length
      else
        @native_key.key.encoded.length
      end
    end

    def equals?(key)
      case key
      when Ccrypto::SecretKey
        logger.debug "Given key is Ccrypto::SecretKey"
        to_jce_secret_key.encoded == key.to_jce_secret_key.encoded
      when javax.crypto.spec.SecretKeySpec
        logger.debug "Given key is java SecretKeySpec"
        to_jce_secret_key.encoded == key.encoded
      when ::Java::byte[]
        to_jce_secret_key.encoded == key
      when String
        to_jce_secret_key.encoded == to_java_bytes(key)
      else
        logger.debug "Not sure how to compare : #{self} / #{key}"
        to_jce_secret_key == key
      end
    end

    def ==(val)
      self.equals?(val)
    end

    private
    def logger
      Ccrypto::Java.logger(:seckey)
    end

  end
end