require_relative '../../../spec_helper'
require_relative '../../../library/digest/sha1/shared/constants'
require_relative '../../../library/digest/sha256/shared/constants'
require_relative '../../../library/digest/sha384/shared/constants'
require_relative '../../../library/digest/sha512/shared/constants'
require 'openssl'

describe "OpenSSL::Digest#initialize" do
  describe "can be called with a digest name" do
    it "returns a SHA1 object" do
      OpenSSL::Digest.new("sha1").name.should == "SHA1"
    end

    it "returns a SHA256 object" do
      OpenSSL::Digest.new("sha256").name.should == "SHA256"
    end

    it "returns a SHA384 object" do
      OpenSSL::Digest.new("sha384").name.should == "SHA384"
    end

    it "returns a SHA512 object" do
      OpenSSL::Digest.new("sha512").name.should ==  "SHA512"
    end

    it "throws an error when called with an unknown digest" do
      -> { OpenSSL::Digest.new("wd40") }.should raise_error(RuntimeError, /Unsupported digest algorithm \(wd40\)/)
    end

    it "cannot be called with a symbol" do
      -> { OpenSSL::Digest.new(:SHA1) }.should raise_error(TypeError, /wrong argument type Symbol/)
    end

    it "does not call #to_str on the argument" do
      name = mock("digest name")
      name.should_not_receive(:to_str)
      -> { OpenSSL::Digest.new(name) }.should raise_error(TypeError, /wrong argument type/)
    end
  end

  describe "can be called with a digest object" do
    it "returns a SHA1 object" do
      OpenSSL::Digest.new(OpenSSL::Digest::SHA1.new).name.should == "SHA1"
    end

    it "returns a SHA256 object" do
      OpenSSL::Digest.new(OpenSSL::Digest::SHA256.new).name.should == "SHA256"
    end

    it "returns a SHA384 object" do
      OpenSSL::Digest.new(OpenSSL::Digest::SHA384.new).name.should == "SHA384"
    end

    it "returns a SHA512 object" do
      OpenSSL::Digest.new(OpenSSL::Digest::SHA512.new).name.should ==  "SHA512"
    end

    it "ignores the state of the digest object" do
      sha1 = OpenSSL::Digest.new('sha1', SHA1Constants::Contents)
      OpenSSL::Digest.new(sha1).digest.should == SHA1Constants::BlankDigest
    end
  end

  it "cannot be called with a digest class" do
    -> { OpenSSL::Digest.new(OpenSSL::Digest::SHA1) }.should raise_error(TypeError, /wrong argument type Class/)
  end

  context "when called without an initial String argument" do
    it "returns a SHA1 digest" do
      OpenSSL::Digest.new("sha1").digest.should == SHA1Constants::BlankDigest
    end

    it "returns a SHA256 digest" do
      OpenSSL::Digest.new("sha256").digest.should == SHA256Constants::BlankDigest
    end

    it "returns a SHA384 digest" do
      OpenSSL::Digest.new("sha384").digest.should == SHA384Constants::BlankDigest
    end

    it "returns a SHA512 digest" do
      OpenSSL::Digest.new("sha512").digest.should == SHA512Constants::BlankDigest
    end
  end

  context "when called with an initial String argument" do
    it "returns a SHA1 digest of that argument" do
      OpenSSL::Digest.new("sha1", SHA1Constants::Contents).digest.should == SHA1Constants::Digest
    end

    it "returns a SHA256 digest of that argument" do
      OpenSSL::Digest.new("sha256", SHA256Constants::Contents).digest.should == SHA256Constants::Digest
    end

    it "returns a SHA384 digest of that argument" do
      OpenSSL::Digest.new("sha384", SHA384Constants::Contents).digest.should == SHA384Constants::Digest
    end

    it "returns a SHA512 digest of that argument" do
      OpenSSL::Digest.new("sha512", SHA512Constants::Contents).digest.should == SHA512Constants::Digest
    end
  end

  context "can be called on subclasses" do
    describe "can be called without an initial String argument on subclasses" do
      it "returns a SHA1 digest" do
        OpenSSL::Digest::SHA1.new.digest.should == SHA1Constants::BlankDigest
      end

      it "returns a SHA256 digest" do
        OpenSSL::Digest::SHA256.new.digest.should == SHA256Constants::BlankDigest
      end

      it "returns a SHA384 digest" do
        OpenSSL::Digest::SHA384.new.digest.should == SHA384Constants::BlankDigest
      end

      it "returns a SHA512 digest" do
        OpenSSL::Digest::SHA512.new.digest.should == SHA512Constants::BlankDigest
      end
    end

    describe "can be called with an initial String argument on subclasses" do
      it "returns a SHA1 digest" do
        OpenSSL::Digest::SHA1.new(SHA1Constants::Contents).digest.should == SHA1Constants::Digest
      end

      it "returns a SHA256 digest" do
        OpenSSL::Digest::SHA256.new(SHA256Constants::Contents).digest.should == SHA256Constants::Digest
      end

      it "returns a SHA384 digest" do
        OpenSSL::Digest::SHA384.new(SHA384Constants::Contents).digest.should == SHA384Constants::Digest
      end

      it "returns a SHA512 digest" do
        OpenSSL::Digest::SHA512.new(SHA512Constants::Contents).digest.should == SHA512Constants::Digest
      end
    end
  end
end