{ system ? builtins.currentSystem,
  config ? {},
  pkgs ? import ../.. { inherit system config; }
}:

with import ../lib/testing-python.nix { inherit system pkgs; };
with pkgs.lib;

let
  postgresql-versions = import ../../pkgs/servers/sql/postgresql pkgs;
  test-sql = pkgs.writeText "postgresql-test" ''
    CREATE EXTENSION pgcrypto; -- just to check if lib loading works
    CREATE TABLE sth (
      id int
    );
    INSERT INTO sth (id) VALUES (1);
    INSERT INTO sth (id) VALUES (1);
    INSERT INTO sth (id) VALUES (1);
    INSERT INTO sth (id) VALUES (1);
    INSERT INTO sth (id) VALUES (1);
    CREATE TABLE xmltest ( doc xml );
    INSERT INTO xmltest (doc) VALUES ('<test>ok</test>'); -- check if libxml2 enabled
  '';
  make-postgresql-test = postgresql-name: postgresql-package: backup-all: makeTest {
    name = postgresql-name;
    meta = with pkgs.lib.maintainers; {
      maintainers = [ zagy ];
    };

    nodes.machine = {...}:
      {
        services.postgresql = {
          enable = true;
          package = postgresql-package;
        };

        services.postgresqlBackup = {
          enable = true;
          databases = optional (!backup-all) "postgres";
        };
      };

    testScript = let
      backupName = if backup-all then "all" else "postgres";
      backupService = if backup-all then "postgresqlBackup" else "postgresqlBackup-postgres";
      backupFileBase = "/var/backup/postgresql/${backupName}";
    in ''
      def check_count(statement, lines):
          return 'test $(sudo -u postgres psql postgres -tAc "{}"|wc -l) -eq {}'.format(
              statement, lines
          )


      machine.start()
      machine.wait_for_unit("postgresql")

      with subtest("Postgresql is available just after unit start"):
          machine.succeed(
              "cat ${test-sql} | sudo -u postgres psql"
          )

      with subtest("Postgresql survives restart (bug #1735)"):
          machine.shutdown()
          import time
          time.sleep(2)
          machine.start()
          machine.wait_for_unit("postgresql")

      machine.fail(check_count("SELECT * FROM sth;", 3))
      machine.succeed(check_count("SELECT * FROM sth;", 5))
      machine.fail(check_count("SELECT * FROM sth;", 4))
      machine.succeed(check_count("SELECT xpath('/test/text()', doc) FROM xmltest;", 1))

      with subtest("Backup service works"):
          machine.succeed(
              "systemctl start ${backupService}.service",
              "zcat ${backupFileBase}.sql.gz | grep '<test>ok</test>'",
              "ls -hal /var/backup/postgresql/ >/dev/console",
              "stat -c '%a' ${backupFileBase}.sql.gz | grep 600",
          )
      with subtest("Backup service removes prev files"):
          machine.succeed(
              # Create dummy prev files.
              "touch ${backupFileBase}.prev.sql{,.gz,.zstd}",
              "chown postgres:postgres ${backupFileBase}.prev.sql{,.gz,.zstd}",

              # Run backup.
              "systemctl start ${backupService}.service",
              "ls -hal /var/backup/postgresql/ >/dev/console",

              # Since nothing has changed in the database, the cur and prev files
              # should match.
              "zcat ${backupFileBase}.sql.gz | grep '<test>ok</test>'",
              "cmp ${backupFileBase}.sql.gz ${backupFileBase}.prev.sql.gz",

              # The prev files with unused suffix should be removed.
              "[ ! -f '${backupFileBase}.prev.sql' ]",
              "[ ! -f '${backupFileBase}.prev.sql.zstd' ]",

              # Both cur and prev file should only be accessible by the postgres user.
              "stat -c '%a' ${backupFileBase}.sql.gz | grep 600",
              "stat -c '%a' '${backupFileBase}.prev.sql.gz' | grep 600",
          )
      with subtest("Backup service fails gracefully"):
          # Sabotage the backup process
          machine.succeed("rm /run/postgresql/.s.PGSQL.5432")
          machine.fail(
              "systemctl start ${backupService}.service",
          )
          machine.succeed(
              "ls -hal /var/backup/postgresql/ >/dev/console",
              "zcat ${backupFileBase}.prev.sql.gz | grep '<test>ok</test>'",
              "stat ${backupFileBase}.in-progress.sql.gz",
          )
          # In a previous version, the second run would overwrite prev.sql.gz,
          # so we test a second run as well.
          machine.fail(
              "systemctl start ${backupService}.service",
          )
          machine.succeed(
              "stat ${backupFileBase}.in-progress.sql.gz",
              "zcat ${backupFileBase}.prev.sql.gz | grep '<test>ok</test>'",
          )


      with subtest("Initdb works"):
          machine.succeed("sudo -u postgres initdb -D /tmp/testpostgres2")

      machine.shutdown()
    '';

  };

  mk-ensure-clauses-test = postgresql-name: postgresql-package: makeTest {
    name = postgresql-name;
    meta = with pkgs.lib.maintainers; {
      maintainers = [ zagy ];
    };

    nodes.machine = {...}:
      {
        services.postgresql = {
          enable = true;
          package = postgresql-package;
          ensureUsers = [
            {
              name = "all-clauses";
              ensureClauses = {
                superuser = true;
                createdb = true;
                createrole = true;
                "inherit" = true;
                login = true;
                replication = true;
                bypassrls = true;
              };
            }
            {
              name = "default-clauses";
            }
          ];
        };
      };

    testScript = let
      getClausesQuery = user: pkgs.lib.concatStringsSep " "
        [
          "SELECT row_to_json(row)"
          "FROM ("
          "SELECT"
            "rolsuper,"
            "rolinherit,"
            "rolcreaterole,"
            "rolcreatedb,"
            "rolcanlogin,"
            "rolreplication,"
            "rolbypassrls"
          "FROM pg_roles"
          "WHERE rolname = '${user}'"
          ") row;"
        ];
    in ''
      import json
      machine.start()
      machine.wait_for_unit("postgresql")

      with subtest("All user permissions are set according to the ensureClauses attr"):
          clauses = json.loads(
            machine.succeed(
                "sudo -u postgres psql -tc \"${getClausesQuery "all-clauses"}\""
            )
          )
          print(clauses)
          assert clauses['rolsuper'], 'expected user with clauses to have superuser clause'
          assert clauses['rolinherit'], 'expected user with clauses to have inherit clause'
          assert clauses['rolcreaterole'], 'expected user with clauses to have create role clause'
          assert clauses['rolcreatedb'], 'expected user with clauses to have create db clause'
          assert clauses['rolcanlogin'], 'expected user with clauses to have login clause'
          assert clauses['rolreplication'], 'expected user with clauses to have replication clause'
          assert clauses['rolbypassrls'], 'expected user with clauses to have bypassrls clause'

      with subtest("All user permissions default when ensureClauses is not provided"):
          clauses = json.loads(
            machine.succeed(
                "sudo -u postgres psql -tc \"${getClausesQuery "default-clauses"}\""
            )
          )
          assert not clauses['rolsuper'], 'expected user with no clauses set to have default superuser clause'
          assert clauses['rolinherit'], 'expected user with no clauses set to have default inherit clause'
          assert not clauses['rolcreaterole'], 'expected user with no clauses set to have default create role clause'
          assert not clauses['rolcreatedb'], 'expected user with no clauses set to have default create db clause'
          assert clauses['rolcanlogin'], 'expected user with no clauses set to have default login clause'
          assert not clauses['rolreplication'], 'expected user with no clauses set to have default replication clause'
          assert not clauses['rolbypassrls'], 'expected user with no clauses set to have default bypassrls clause'

      machine.shutdown()
    '';
  };
in
  concatMapAttrs (name: package: {
    ${name} = make-postgresql-test name package false;
    ${name + "-clauses"} = mk-ensure-clauses-test name package;
  }) postgresql-versions
  // {
    postgresql_11-backup-all = make-postgresql-test "postgresql_11-backup-all" postgresql-versions.postgresql_11 true;
  }