# frozen_string_literal: true

require "spec_helper"

describe BagIt::Bag do
  describe "a valid bag" do
    before do
      @sandbox = Sandbox.new

      # make the bag
      @bag_path = File.join @sandbox.to_s, "the_bag"
      @bag = described_class.new @bag_path

      # add some files
      File.open("/dev/urandom") do |rio|
        10.times do |n|
          @bag.add_file("file-#{n}-💩
") { |io| io.write rio.read(16) }
          @bag.add_tag_file("tag-#{n}") { |io| io.write rio.read(16) }
        end
      end

      @bag.manifest!
    end

    after do
      @sandbox.cleanup!
    end

    it "validates with no errors" do
      expect(@bag).to be_valid
    end

    it "is invalid if there is a file that's in the bag, but not in the manifest" do
      # add a file into the bag through the back door
      File.open(File.join(@bag.data_dir, "not-manifested"), "w") do |io|
        io.puts "nothing to see here, move along"
      end

      @bag.validate_only("true_for/completeness")
      expect(@bag.errors.on(:completeness)).not_to be_empty
      expect(@bag).not_to be_valid
    end

    it "is invalid if there are files that are in the manifest but not in the bag" do
      # add a file and then remove it through the back door
      @bag.add_file("file-k") { |io| io.puts "time to go" }
      @bag.manifest!

      FileUtils.rm File.join(@bag.bag_dir, "data", "file-k")

      @bag.validate_only("true_for/completeness")
      expect(@bag.errors.on(:completeness)).not_to be_empty
      expect(@bag).not_to be_valid
    end

    it "is invalid if there is a fixity problem" do
      # tweak a file through the back door
      File.open(@bag.bag_files[0], "a") { |io| io.puts "oops!" }

      @bag.validate_only("true_for/consistency")
      expect(@bag.errors.on(:consistency)).not_to be_empty
      expect(@bag).not_to be_valid
    end

    it "calculates sha1 correctly for a big file" do
      @bag.add_file "big-data-file" do |fh|
        count = 0
        while count < 1024 * 512
          fh.write "1" * 1024
          count += 1
        end
      end
      @bag.manifest!
      sha1_manifest = File.join @bag_path, "manifest-sha1.txt"
      checksums = {}
      File.open(sha1_manifest).each_line do |line|
        fixity, path = line.split(" ")
        checksums[path] = fixity
      end
      expected = checksums["data/big-data-file"]
      expect(expected).to eq("12be64c30968bb90136ee695dc58f4b2276968c6")
    end

    it "validates by oxum when needed" do
      expect(@bag.valid_oxum?).to eq(true)
    end

    it "raises a sensible error when the manifest algorithm is unknown" do
      # add a manifest with an unsupported algorithm
      File.open(File.join(@bag.bag_dir, "manifest-sha999.txt"), "w") do |io|
        io.puts "digest-does-not-matter data/file-0\n"
      end
      expect { @bag.valid? }.to raise_error ArgumentError
    end

    it "validates false by oxum when file count is incorrect" do
      # tweak oxum through backdoor
      File.open(@bag.bag_info_txt_file, "a") { |f| f.write "Payload-Oxum: " + @bag.bag_info["Payload-Oxum"].split(".")[0] + ".0" }
      expect(@bag.valid_oxum?).to eq(false)
    end

    it "validates false by oxum when octetstream size is incorrect" do
      # tweak oxum through backdoor
      File.open(@bag.bag_info_txt_file, "a") { |f| f.write "Payload-Oxum: 1." + @bag.bag_info["Payload-Oxum"].split(".")[1] }
      expect(@bag.valid_oxum?).to eq(false)
    end

    describe "tag manifest validation" do
      it "is invalid if there are no manifest files at all even when there are no files" do
        # remove all files, tag/manifest files & tagmanifest files through the back door
        @bag.bag_files.each do |bag_file|
          FileUtils.rm bag_file
        end
        @bag.tag_files.each do |tag_file|
          FileUtils.rm tag_file
        end
        @bag.tagmanifest_files.each do |tagmanifest_file|
          FileUtils.rm tagmanifest_file
        end

        # @bag.should_not be_valid
        expect(@bag).not_to be_valid
        expect(@bag.errors.on(:completeness)).not_to be_empty
      end
    end

    describe "tag manifest validation" do
      it "is invalid if listed tag file does not exist" do
        # add a file and then remove it through the back door
        @bag.add_tag_file("tag-k") { |io| io.puts "time to go" }
        @bag.tagmanifest!

        FileUtils.rm File.join(@bag.bag_dir, "tag-k")

        # @bag.should_not be_valid
        expect(@bag).not_to be_valid
        expect(@bag.errors.on(:completeness)).not_to be_empty
      end
    end
  end
end