describe Appsignal::Config do
  describe "#initialize" do
    describe "environment" do
      context "when environment is nil" do
        let(:config) { described_class.new("", nil) }

        it "sets an empty string" do
          expect(config.env).to eq("")
        end
      end

      context "when environment is given" do
        let(:env) { "my_env" }
        let(:config) { described_class.new("", "my_env") }

        it "sets the environment" do
          expect(config.env).to eq(env)
        end

        it "sets the environment as loaded through the initial_config" do
          expect(config.initial_config).to eq(:env => env)
          expect(config.config_hash).to_not have_key(:env)
        end

        context "with APPSIGNAL_APP_ENV environment variable" do
          let(:env_env) { "my_env_env" }
          before { ENV["APPSIGNAL_APP_ENV"] = env_env }

          it "uses the environment variable" do
            expect(config.env).to eq(env_env)
          end

          it "sets the environment as loaded through the env_config" do
            expect(config.initial_config).to eq(:env => env)
            expect(config.env_config).to eq(:env => env_env)
            expect(config.config_hash).to_not have_key(:env)
          end
        end
      end
    end
  end

  describe "config based on the system" do
    let(:config) { silence { project_fixture_config(:none) } }

    describe ":active" do
      subject { config[:active] }

      context "with APPSIGNAL_PUSH_API_KEY env variable" do
        before { ENV["APPSIGNAL_PUSH_API_KEY"] = "abc" }

        it "becomes active" do
          expect(subject).to be_truthy
        end

        it "sets the push_api_key as loaded through the env_config" do
          expect(config.env_config).to eq(:push_api_key => "abc")
          expect(config.system_config).to eq(:active => true)
        end
      end

      context "without APPSIGNAL_PUSH_API_KEY env variable" do
        it "remains inactive" do
          expect(subject).to be_falsy
        end
      end
    end

    describe ":log" do
      subject { config[:log] }

      context "when running on Heroku" do
        around { |example| recognize_as_heroku { example.run } }

        it "is set to stdout" do
          expect(subject).to eq("stdout")
        end

        it "sets the log as loaded through the system" do
          expect(config.system_config).to eq(:log => "stdout")
        end
      end

      context "when not running on Heroku" do
        it "is set to file" do
          expect(subject).to eq("file")
        end

        it "does not set log as loaded through the system" do
          expect(config.system_config).to eq({})
        end
      end
    end
  end

  describe "initial config" do
    let(:initial_config) do
      {
        :push_api_key => "abc",
        :name => "TestApp",
        :active => true,
        :revision => "v2.5.1",
        :request_headers => []
      }
    end
    let(:config) do
      described_class.new("non-existing-path", "production", initial_config)
    end

    it "merges with the default config" do
      expect(config.config_hash).to eq(
        :debug                          => false,
        :log                            => "file",
        :ignore_actions                 => [],
        :ignore_errors                  => [],
        :ignore_namespaces              => [],
        :filter_parameters              => [],
        :filter_session_data            => [],
        :instrument_net_http            => true,
        :instrument_redis               => true,
        :instrument_sequel              => true,
        :skip_session_data              => false,
        :send_params                    => true,
        :endpoint                       => "https://push.appsignal.com",
        :push_api_key                   => "abc",
        :name                           => "TestApp",
        :active                         => true,
        :enable_frontend_error_catching => false,
        :frontend_error_catching_path   => "/appsignal_error_catcher",
        :enable_allocation_tracking     => true,
        :enable_gc_instrumentation      => false,
        :enable_host_metrics            => true,
        :enable_minutely_probes         => true,
        :ca_file_path                   => File.join(resources_dir, "cacert.pem"),
        :dns_servers                    => [],
        :files_world_accessible         => true,
        :revision                       => "v2.5.1",
        :request_headers                => []
      )
    end

    it "sets the initial_config" do
      expect(config.initial_config).to eq(initial_config)
    end

    describe "overriding system detected config" do
      describe ":running_in_container" do
        let(:config) do
          described_class.new(
            "non-existing-path",
            "production",
            :running_in_container => true
          )
        end
        subject { config[:running_in_container] }

        it "overrides system detected config" do
          expect(subject).to be_truthy
        end
      end

      describe ":active" do
        subject { config[:active] }

        context "with APPSIGNAL_PUSH_API_KEY env variable" do
          let(:config) do
            described_class.new(
              "non-existing-path",
              "production",
              :active => false,
              :request_headers => []
            )
          end
          before { ENV["APPSIGNAL_PUSH_API_KEY"] = "abc" }

          it "sets given config rather than env variable" do
            expect(subject).to be_falsy
          end
        end
      end
    end
  end

  context "when root path is nil" do
    let(:config) { described_class.new(nil, "production") }

    it "is not valid or active" do
      expect(config.valid?).to be_falsy
      expect(config.active?).to be_falsy
    end
  end

  context "without config file" do
    let(:config) { described_class.new(tmp_dir, "production") }

    it "is not valid or active" do
      expect(config.valid?).to be_falsy
      expect(config.active?).to be_falsy
    end
  end

  context "with a config file" do
    let(:config) { project_fixture_config("production") }

    context "with valid config" do
      it "is valid and active" do
        expect(config.valid?).to be_truthy
        expect(config.active?).to be_truthy
      end

      it "does not log an error" do
        log = capture_logs { config }
        expect(log).to_not contains_log(:error)
      end
    end

    it "sets the file_config" do
      # config found in spec/support/project_fixture/config/appsignal.yml
      expect(config.file_config).to match(
        :active => true,
        :push_api_key => "abc",
        :name => "TestApp",
        :request_headers => kind_of(Array),
        :enable_minutely_probes => false
      )
    end

    describe "overriding system and defaults config" do
      let(:config) do
        described_class.new(
          "non-existing-path",
          "production",
          :running_in_container => true,
          :debug => true
        )
      end

      it "overrides system detected and defaults config" do
        expect(config[:running_in_container]).to be_truthy
        expect(config[:debug]).to be_truthy
      end
    end

    context "with the env name as a symbol" do
      let(:config) { project_fixture_config(:production) }

      it "loads the config" do
        expect(config.valid?).to be_truthy
        expect(config.active?).to be_truthy

        expect(config[:push_api_key]).to eq("abc")
      end
    end

    context "without the selected env" do
      let(:config) { project_fixture_config("nonsense") }

      it "is not valid or active" do
        expect(config.valid?).to be_falsy
        expect(config.active?).to be_falsy
      end

      it "logs an error" do
        expect_any_instance_of(Logger).to receive(:error).once
          .with("Not loading from config file: config for 'nonsense' not found")
        expect_any_instance_of(Logger).to receive(:error).once
          .with("Push api key not set after loading config")
        config
      end
    end

    describe "support for old config keys" do
      let(:out_stream) { std_stream }
      let(:output) { out_stream.read }
      let(:config) { project_fixture_config(env, {}, test_logger(log)) }
      let(:log) { StringIO.new }
      before { capture_stdout(out_stream) { config } }

      describe ":api_key" do
        context "without :push_api_key" do
          let(:env) { "old_config" }

          it "sets the :push_api_key with the old :api_key value" do
            expect(config[:push_api_key]).to eq "def"
            expect(config.config_hash).to_not have_key :api_key

            message = "Old configuration key found. Please update the 'api_key' to 'push_api_key'"
            expect(output).to include "appsignal WARNING: #{message}"
            expect(log_contents(log)).to contains_log :warn, message
          end
        end

        context "with :push_api_key" do
          let(:env) { "old_config_mixed_with_new_config" }

          it "ignores the :api_key config and deletes it" do
            expect(config[:push_api_key]).to eq "ghi"
            expect(config.config_hash).to_not have_key :api_key

            message = "Old configuration key found. Please update the 'api_key' to 'push_api_key'"
            expect(output).to include "appsignal WARNING: #{message}"
            expect(log_contents(log)).to contains_log :warn, message
          end
        end
      end

      describe ":ignore_exceptions" do
        context "without :ignore_errors" do
          let(:env) { "old_config" }

          it "sets :ignore_errors with the old :ignore_exceptions value" do
            expect(config[:ignore_errors]).to eq ["StandardError"]
            expect(config.config_hash).to_not have_key :ignore_exceptions

            message = "Old configuration key found. Please update the 'ignore_exceptions' to 'ignore_errors'"
            expect(output).to include "appsignal WARNING: #{message}"
            expect(log_contents(log)).to contains_log :warn, message
          end
        end

        context "with :ignore_errors" do
          let(:env) { "old_config_mixed_with_new_config" }

          it "ignores the :ignore_exceptions config" do
            expect(config[:ignore_errors]).to eq ["NoMethodError"]
            expect(config.config_hash).to_not have_key :ignore_exceptions

            message = "Old configuration key found. Please update the 'ignore_exceptions' to 'ignore_errors'"
            expect(output).to include "appsignal WARNING: #{message}"
            expect(log_contents(log)).to contains_log :warn, message
          end
        end
      end
    end
  end

  context "with config in the environment" do
    let(:config) do
      described_class.new(
        "non-existing-path",
        "production",
        :running_in_container => true,
        :debug => true
      )
    end
    let(:env_config) do
      {
        :running_in_container => true,
        :push_api_key => "aaa-bbb-ccc",
        :active => true,
        :name => "App name",
        :debug => true,
        :ignore_actions => %w[action1 action2],
        :ignore_errors => %w[ExampleStandardError AnotherError],
        :ignore_namespaces => %w[admin private_namespace],
        :instrument_net_http => false,
        :instrument_redis => false,
        :instrument_sequel => false,
        :files_world_accessible => false,
        :request_headers => %w[accept accept-charset],
        :revision => "v2.5.1"
      }
    end
    before do
      ENV["APPSIGNAL_RUNNING_IN_CONTAINER"]    = "true"
      ENV["APPSIGNAL_PUSH_API_KEY"]            = "aaa-bbb-ccc"
      ENV["APPSIGNAL_ACTIVE"]                  = "true"
      ENV["APPSIGNAL_APP_NAME"]                = "App name"
      ENV["APPSIGNAL_DEBUG"]                   = "true"
      ENV["APPSIGNAL_IGNORE_ACTIONS"]          = "action1,action2"
      ENV["APPSIGNAL_IGNORE_ERRORS"]           = "ExampleStandardError,AnotherError"
      ENV["APPSIGNAL_IGNORE_NAMESPACES"]       = "admin,private_namespace"
      ENV["APPSIGNAL_INSTRUMENT_NET_HTTP"]     = "false"
      ENV["APPSIGNAL_INSTRUMENT_REDIS"]        = "false"
      ENV["APPSIGNAL_INSTRUMENT_SEQUEL"]       = "false"
      ENV["APPSIGNAL_FILES_WORLD_ACCESSIBLE"]  = "false"
      ENV["APPSIGNAL_REQUEST_HEADERS"]         = "accept,accept-charset"
      ENV["APP_REVISION"] = "v2.5.1"
    end

    it "overrides config with environment values" do
      expect(config.valid?).to be_truthy
      expect(config.active?).to be_truthy
      expect(config.config_hash).to include(env_config)
    end

    context "with mixed case `true` env variables values" do
      before do
        ENV["APPSIGNAL_DEBUG"] = "TRUE"
        ENV["APPSIGNAL_INSTRUMENT_SEQUEL"] = "True"
      end

      it "accepts mixed case `true` values" do
        expect(config[:debug]).to eq(true)
        expect(config[:instrument_sequel]).to eq(true)
      end
    end

    it "sets the env_config" do
      expect(config.env_config).to eq(env_config)
    end
  end

  describe "config keys" do
    describe ":endpoint" do
      subject { config[:endpoint] }

      context "with an pre-0.12-style endpoint" do
        let(:config) do
          project_fixture_config("production", :endpoint => "https://push.appsignal.com/1")
        end

        it "strips off the path" do
          expect(subject).to eq "https://push.appsignal.com"
        end
      end

      context "with a non-standard port" do
        let(:config) { project_fixture_config("production", :endpoint => "http://localhost:4567") }

        it "keeps the port" do
          expect(subject).to eq "http://localhost:4567"
        end
      end
    end
  end

  describe "#[]" do
    let(:config) { project_fixture_config(:none, :push_api_key => "foo", :request_headers => []) }

    context "with existing key" do
      it "gets the value" do
        expect(config[:push_api_key]).to eq "foo"
      end
    end

    context "without existing key" do
      it "returns nil" do
        expect(config[:nonsense]).to be_nil
      end
    end
  end

  describe "#[]=" do
    let(:config) { project_fixture_config(:none) }

    context "with existing key" do
      it "changes the value" do
        expect(config[:push_api_key]).to be_nil
        config[:push_api_key] = "abcde"
        expect(config[:push_api_key]).to eq "abcde"
      end
    end

    context "with new key" do
      it "sets the value" do
        expect(config[:foo]).to be_nil
        config[:foo] = "bar"
        expect(config[:foo]).to eq "bar"
      end
    end
  end

  describe "#write_to_environment" do
    let(:config) { project_fixture_config(:production) }
    before do
      config[:http_proxy] = "http://localhost"
      config[:ignore_actions] = %w[action1 action2]
      config[:ignore_errors] = %w[ExampleStandardError AnotherError]
      config[:ignore_namespaces] = %w[admin private_namespace]
      config[:log] = "stdout"
      config[:log_path] = "/tmp"
      config[:filter_parameters] = %w[password confirm_password]
      config[:running_in_container] = false
      config[:dns_servers] = ["8.8.8.8", "8.8.4.4"]
      config[:revision] = "v2.5.1"
      config.write_to_environment
    end

    it "writes the current config to environment variables" do
      expect(ENV["_APPSIGNAL_ACTIVE"]).to                       eq "true"
      expect(ENV["_APPSIGNAL_APP_PATH"]).to                     end_with("spec/support/fixtures/projects/valid")
      expect(ENV["_APPSIGNAL_AGENT_PATH"]).to                   end_with("/ext")
      expect(ENV["_APPSIGNAL_DEBUG_LOGGING"]).to                eq "false"
      expect(ENV["_APPSIGNAL_LOG"]).to                          eq "stdout"
      expect(ENV["_APPSIGNAL_LOG_FILE_PATH"]).to                end_with("/tmp/appsignal.log")
      expect(ENV["_APPSIGNAL_PUSH_API_ENDPOINT"]).to            eq "https://push.appsignal.com"
      expect(ENV["_APPSIGNAL_PUSH_API_KEY"]).to                 eq "abc"
      expect(ENV["_APPSIGNAL_APP_NAME"]).to                     eq "TestApp"
      expect(ENV["_APPSIGNAL_ENVIRONMENT"]).to                  eq "production"
      expect(ENV["_APPSIGNAL_LANGUAGE_INTEGRATION_VERSION"]).to eq "ruby-#{Appsignal::VERSION}"
      expect(ENV["_APPSIGNAL_HTTP_PROXY"]).to                   eq "http://localhost"
      expect(ENV["_APPSIGNAL_IGNORE_ACTIONS"]).to               eq "action1,action2"
      expect(ENV["_APPSIGNAL_IGNORE_ERRORS"]).to                eq "ExampleStandardError,AnotherError"
      expect(ENV["_APPSIGNAL_IGNORE_NAMESPACES"]).to            eq "admin,private_namespace"
      expect(ENV["_APPSIGNAL_RUNNING_IN_CONTAINER"]).to         eq "false"
      expect(ENV["_APPSIGNAL_ENABLE_HOST_METRICS"]).to          eq "true"
      expect(ENV["_APPSIGNAL_HOSTNAME"]).to                     eq ""
      expect(ENV["_APPSIGNAL_PROCESS_NAME"]).to                 include "rspec"
      expect(ENV["_APPSIGNAL_CA_FILE_PATH"]).to                 eq File.join(resources_dir, "cacert.pem")
      expect(ENV["_APPSIGNAL_DNS_SERVERS"]).to                  eq "8.8.8.8,8.8.4.4"
      expect(ENV["_APPSIGNAL_FILES_WORLD_ACCESSIBLE"]).to       eq "true"
      expect(ENV["_APP_REVISION"]).to                           eq "v2.5.1"
      expect(ENV).to_not                                        have_key("_APPSIGNAL_WORKING_DIR_PATH")
      expect(ENV).to_not                                        have_key("_APPSIGNAL_WORKING_DIRECTORY_PATH")
    end

    context "with :hostname" do
      before do
        config[:hostname] = "Alices-MBP.example.com"
        config.write_to_environment
      end

      it "sets the modified :hostname" do
        expect(ENV["_APPSIGNAL_HOSTNAME"]).to eq "Alices-MBP.example.com"
      end
    end

    context "with :working_dir_path" do
      before do
        config[:working_dir_path] = "/tmp/appsignal2"
        config.write_to_environment
      end

      it "sets the modified :working_dir_path" do
        expect(ENV["_APPSIGNAL_WORKING_DIR_PATH"]).to eq "/tmp/appsignal2"
      end
    end

    context "with :working_directory_path" do
      before do
        config[:working_directory_path] = "/tmp/appsignal2"
        config.write_to_environment
      end

      it "sets the modified :working_directory_path" do
        expect(ENV["_APPSIGNAL_WORKING_DIRECTORY_PATH"]).to eq "/tmp/appsignal2"
      end
    end
  end

  describe "#log_file_path" do
    let(:out_stream) { std_stream }
    let(:output) { out_stream.read }
    let(:config) { project_fixture_config("production", :log_path => log_path) }
    subject { capture_stdout(out_stream) { config.log_file_path } }

    context "when path is writable" do
      let(:log_path) { File.join(tmp_dir, "writable-path") }
      before { FileUtils.mkdir_p(log_path, :mode => 0o755) }
      after { FileUtils.rm_rf(log_path) }

      it "returns log file path" do
        expect(subject).to eq File.join(log_path, "appsignal.log")
      end

      it "prints no warning" do
        subject
        expect(output).to be_empty
      end
    end

    shared_examples "#log_file_path: tmp path" do
      let(:system_tmp_dir) { described_class.system_tmp_dir }
      before { FileUtils.mkdir_p(system_tmp_dir) }
      after { FileUtils.rm_rf(system_tmp_dir) }

      context "when the /tmp fallback path is writable" do
        before { FileUtils.chmod(0o777, system_tmp_dir) }

        it "returns returns the tmp location" do
          expect(subject).to eq(File.join(system_tmp_dir, "appsignal.log"))
        end

        it "prints a warning" do
          subject
          expect(output).to include "appsignal: Unable to log to '#{log_path}'. "\
            "Logging to '#{system_tmp_dir}' instead."
        end
      end

      context "when the /tmp fallback path is not writable" do
        before { FileUtils.chmod(0o555, system_tmp_dir) }

        it "returns nil" do
          expect(subject).to be_nil
        end

        it "prints a warning" do
          subject
          expect(output).to include "appsignal: Unable to log to '#{log_path}' "\
            "or the '#{system_tmp_dir}' fallback."
        end
      end
    end

    context "when path is nil" do
      let(:log_path) { nil }

      context "when root_path is nil" do
        before { allow(config).to receive(:root_path).and_return(nil) }

        include_examples "#log_file_path: tmp path"
      end

      context "when root_path is set" do
        it "returns returns the project log location" do
          expect(subject).to eq File.join(config.root_path, "log/appsignal.log")
        end

        it "prints no warning" do
          subject
          expect(output).to be_empty
        end
      end
    end

    context "when path does not exist" do
      let(:log_path) { "/non-existing" }

      include_examples "#log_file_path: tmp path"
    end

    context "when path is not writable" do
      let(:log_path) { File.join(tmp_dir, "not-writable-path") }
      before { FileUtils.mkdir_p(log_path, :mode => 0o555) }
      after { FileUtils.rm_rf(log_path) }

      include_examples "#log_file_path: tmp path"
    end

    context "when path is a symlink" do
      context "when linked path does not exist" do
        let(:real_path) { File.join(tmp_dir, "real-path") }
        let(:log_path) { File.join(tmp_dir, "symlink-path") }
        before { File.symlink(real_path, log_path) }
        after { FileUtils.rm(log_path) }

        include_examples "#log_file_path: tmp path"
      end

      context "when linked path exists" do
        context "when linked path is not writable" do
          let(:real_path) { File.join(tmp_dir, "real-path") }
          let(:log_path) { File.join(tmp_dir, "symlink-path") }
          before do
            FileUtils.mkdir_p(real_path)
            FileUtils.chmod(0o444, real_path)
            File.symlink(real_path, log_path)
          end
          after do
            FileUtils.rm_rf(real_path)
            FileUtils.rm(log_path)
          end

          include_examples "#log_file_path: tmp path"
        end

        context "when linked path is writable" do
          let(:real_path) { File.join(tmp_dir, "real-path") }
          let(:log_path) { File.join(tmp_dir, "symlink-path") }
          before do
            FileUtils.mkdir_p(real_path)
            File.symlink(real_path, log_path)
          end
          after do
            FileUtils.rm_rf(real_path)
            FileUtils.rm(log_path)
          end

          it "returns real path of log path" do
            expect(subject).to eq(File.join(real_path, "appsignal.log"))
          end
        end
      end
    end
  end

  describe ".system_tmp_dir" do
    before do
      # To counteract the stub in spec_helper
      expect(Appsignal::Config).to receive(:system_tmp_dir).and_call_original
    end

    context "when on a *NIX OS" do
      before do
        expect(Gem).to receive(:win_platform?).and_return(false)
      end

      it "returns the system's tmp dir" do
        expect(described_class.system_tmp_dir).to eq(File.realpath("/tmp"))
      end
    end

    context "when on Microsoft Windows" do
      before do
        expect(Gem).to receive(:win_platform?).and_return(true)
      end

      it "returns the system's tmp dir" do
        expect(described_class.system_tmp_dir).to eq(Dir.tmpdir)
      end
    end
  end

  describe "#validate" do
    subject { config.valid? }
    let(:config) do
      described_class.new(Dir.pwd, "production", config_options)
    end

    describe "push_api_key" do
      let(:config_options) { { :push_api_key => push_api_key, :request_headers => [] } }
      before { config.validate }

      context "with missing push_api_key" do
        let(:push_api_key) { nil }

        it "sets valid to false" do
          is_expected.to eq(false)
        end
      end

      context "with push_api_key present" do
        let(:push_api_key) { "abc" }

        it "sets valid to true" do
          is_expected.to eq(true)
        end
      end
    end
  end
end