# frozen_string_literal: true

require_relative "shared_context_for_backup_restore"

RSpec.describe BackupRestore::MetaDataHandler do
  include_context "with shared stuff"

  let!(:backup_filename) { "discourse-2019-11-18-143242-v20191108000414.tar.gz" }

  def with_metadata_file(content)
    Dir.mktmpdir do |directory|
      if !content.nil?
        path = File.join(directory, BackupRestore::MetaDataHandler::METADATA_FILE)
        File.write(path, content)
      end

      yield(directory)
    end
  end

  def validate_metadata(filename, tmp_directory)
    BackupRestore::MetaDataHandler.new(logger, filename, tmp_directory).validate
  end

  describe "metadata file" do
    it "extracts metadata from file when metadata file exists" do
      metadata = '{"source":"discourse","version":20160329101122}'

      with_metadata_file(metadata) do |dir|
        expect(validate_metadata(backup_filename, dir)).to include(version: 20_160_329_101_122)
      end
    end

    it "raises an exception when the metadata file contains invalid JSON" do
      corrupt_metadata = '{"version":20160329101122'

      with_metadata_file(corrupt_metadata) do |dir|
        expect { validate_metadata(backup_filename, dir) }.to raise_error(
          BackupRestore::MetaDataError,
        )
      end
    end

    it "raises an exception when the metadata file is empty" do
      with_metadata_file("") do |dir|
        expect { validate_metadata(backup_filename, dir) }.to raise_error(
          BackupRestore::MetaDataError,
        )
      end
    end

    it "raises an exception when the metadata file contains an invalid version number" do
      metadata = '{"source":"discourse","version":"1abcdefghijklm"}'

      with_metadata_file(metadata) do |dir|
        expect { validate_metadata(backup_filename, dir) }.to raise_error(
          BackupRestore::MetaDataError,
        )
      end
    end

    it "raises an exception when the metadata file contains an empty version number" do
      metadata = '{"source":"discourse","version":""}'

      with_metadata_file(metadata) do |dir|
        expect { validate_metadata(backup_filename, dir) }.to raise_error(
          BackupRestore::MetaDataError,
        )
      end
    end
  end

  describe "filename" do
    it "extracts metadata from filename when metadata file does not exist" do
      with_metadata_file(nil) do |dir|
        expect(validate_metadata(backup_filename, dir)).to include(version: 20_191_108_000_414)
      end
    end

    it "raises an exception when the filename contains no version number" do
      filename = "discourse-2019-11-18-143242.tar.gz"

      expect { validate_metadata(filename, nil) }.to raise_error(BackupRestore::MetaDataError)
    end

    it "raises an exception when the filename contains an invalid version number" do
      filename = "discourse-2019-11-18-143242-v123456789.tar.gz"
      expect { validate_metadata(filename, nil) }.to raise_error(BackupRestore::MetaDataError)

      filename = "discourse-2019-11-18-143242-v1abcdefghijklm.tar.gz"
      expect { validate_metadata(filename, nil) }.to raise_error(BackupRestore::MetaDataError)
    end
  end

  it "raises an exception when the backup's version is newer than the current version" do
    new_backup_filename = "discourse-2019-11-18-143242-v20191113193141.sql.gz"

    BackupRestore.expects(:current_version).returns(20_191_025_005_204).once

    expect { validate_metadata(new_backup_filename, nil) }.to raise_error(
      BackupRestore::MigrationRequiredError,
    )
  end
end