import ./make-test-python.nix (
  { pkgs, lib, ... }:
  let
    uiPort = 1234;
    backendPort = 5678;
    lemmyNodeName = "server";
  in
  {
    name = "lemmy";
    meta = with lib.maintainers; {
      maintainers = [ mightyiam ];
    };

    nodes = {
      client = { };

      "${lemmyNodeName}" = {
        services.lemmy = {
          enable = true;
          ui.port = uiPort;
          database.createLocally = true;
          settings = {
            hostname = "http://${lemmyNodeName}";
            port = backendPort;
            # Without setup, the /feeds/* and /nodeinfo/* API endpoints won't return 200
            setup = {
              admin_username = "mightyiam";
              site_name = "Lemmy FTW";
              admin_email = "mightyiam@example.com";
            };
          };
          adminPasswordFile = /etc/lemmy-admin-password.txt;
          caddy.enable = true;
        };

        environment.etc."lemmy-admin-password.txt".text = "ThisIsWhatIUseEverywhereTryIt";

        networking.firewall.allowedTCPPorts = [ 80 ];

        # pict-rs seems to need more than 1025114112 bytes
        virtualisation.memorySize = 2000;
      };
    };

    testScript = ''
      server = ${lemmyNodeName}

      with subtest("the merged config is secure"):
          server.wait_for_unit("lemmy.service")
          config_permissions = server.succeed("stat --format %A /run/lemmy/config.hjson").rstrip()
          assert config_permissions == "-rw-------", f"merged config permissions {config_permissions} are insecure"
          directory_permissions = server.succeed("stat --format %A /run/lemmy").rstrip()
          assert directory_permissions[5] == directory_permissions[8] == "-", "merged config can be replaced"

      with subtest("the backend starts and responds"):
          server.wait_for_open_port(${toString backendPort})
          # wait until succeeds, it just needs few seconds for migrations, but lets give it 50s max
          server.wait_until_succeeds("curl --fail localhost:${toString backendPort}/api/v3/site", 50)

      with subtest("the UI starts and responds"):
          server.wait_for_unit("lemmy-ui.service")
          server.wait_for_open_port(${toString uiPort})
          server.succeed("curl --fail localhost:${toString uiPort}")

      with subtest("Lemmy-UI responds through the caddy reverse proxy"):
          server.systemctl("start network-online.target")
          server.wait_for_unit("network-online.target")
          server.wait_for_unit("caddy.service")
          server.wait_for_open_port(80)
          body = server.execute("curl --fail --location ${lemmyNodeName}")[1]
          assert "Lemmy" in body, f"String Lemmy not found in response for ${lemmyNodeName}: \n{body}"

      with subtest("the server is exposed externally"):
          client.systemctl("start network-online.target")
          client.wait_for_unit("network-online.target")
          client.succeed("curl -v --fail ${lemmyNodeName}")

      with subtest("caddy correctly routes backend requests"):
          # Make sure we are not hitting frontend
          server.execute("systemctl stop lemmy-ui.service")

          def assert_http_code(url, expected_http_code, extra_curl_args=""):
              _, http_code = server.execute(f'curl --location --silent -o /dev/null {extra_curl_args} --fail --write-out "%{{http_code}}" {url}')
              assert http_code == str(expected_http_code), f"expected http code {expected_http_code}, got {http_code}"

          # Caddy responds with HTTP code 502 if it cannot handle the requested path
          assert_http_code("${lemmyNodeName}/obviously-wrong-path/", 502)

          assert_http_code("${lemmyNodeName}/static/js/client.js", 200)
          assert_http_code("${lemmyNodeName}/api/v3/site", 200)

          # A 404 confirms that the request goes to the backend
          # No path can return 200 until after we upload an image to pict-rs
          assert_http_code("${lemmyNodeName}/pictrs/", 404)

          assert_http_code("${lemmyNodeName}/feeds/all.xml", 200)
          assert_http_code("${lemmyNodeName}/nodeinfo/2.0.json", 200)

          assert_http_code("${lemmyNodeName}/some-other-made-up-path/", 404, "-X POST")
          assert_http_code("${lemmyNodeName}/some-other-path", 404, "-H 'Accept: application/activity+json'")
          assert_http_code("${lemmyNodeName}/some-other-path", 404, "-H 'Accept: application/ld+json; profile=\"https://www.w3.org/ns/activitystreams\"'")
    '';
  }
)