{ lib, pkgs, config, ...}:
let
  ldap = pkgs.writeTextFile {
    name = "ldap.toml";
    text = ''
      [[servers]]
      host = "ldap.cloonar.com"
      port = 636
      use_ssl = true
      bind_dn = "cn=grafana,ou=system,ou=users,dc=cloonar,dc=com"
      bind_password = "$__file{/run/secrets/grafana-ldap-password}"
      search_filter = "(&(objectClass=cloonarUser)(mail=%s))"
      search_base_dns = ["ou=users,dc=cloonar,dc=com"]

      [servers.attributes]
      name = "givenName"
      surname = "sn"
      username = "mail"
      email =  "mail"
      member_of = "memberOf"

      [[servers.group_mappings]]
      group_dn = "cn=Administrators,ou=groups,dc=cloonar,dc=com"
      org_role = "Admin"
      grafana_admin = true # Available in Grafana v5.3 and above
    '';
  };
in
{
  imports = [
    # Individual alert files removed, now handled by alerting/system/default.nix
    ./alerting/system/default.nix # Added: Imports the consolidated system alerts module
    ./alerting/service/default.nix # Added: Imports the new service alerts module
    ./alerting/websites/default.nix # Added: Imports the new websites alerts module
    # ... other rule files can be added here ...
    ./datasources/victoriametrics.nix
    ./datasources/loki.nix # Add Loki datasource
  ];

  systemd.services.grafana.script = lib.mkBefore ''
    export GF_AUTH_GENERIC_OAUTH_CLIENT_SECRET=$(cat /run/secrets/grafana-oauth-secret)
    export PUSHOVER_API_TOKEN=$(cat /run/secrets/pushover-api-token)
    export PUSHOVER_USER_KEY=$(cat /run/secrets/pushover-user-key)
  '';
  services.grafana = {
    enable = true;
    settings = {
      analytics.reporting_enabled = false;
      "auth.ldap".enabled = true;
      "auth.ldap".config_file = toString ldap;

      "auth.generic_oauth" = {
        enabled = true;
        name = "Authelia";
        icon = "signin";
        client_id = "grafana";
        scopes = "openid profile email groups";
        empty_scopes = false;
        auth_url = "https://auth.cloonar.com/api/oidc/authorization";
        token_url = "https://auth.cloonar.com/api/oidc/token";
        api_url = "https://auth.cloonar.com/api/oidc/userinfo";
        login_attribute_path = "preferred_username";
        groups_attribute_path = "groups";
        role_attribute_path = "contains(groups, 'Administrators') && 'Admin' || contains(groups, 'editor') && 'Editor' || 'Viewer'";
        allow_assign_grafana_admin = true;
        name_attribute_path = "name";
        use_pkce = true;
      };

      "auth.anonymous".enabled = true;
      "auth.anonymous".org_name = "Cloonar e.U.";
      "auth.anonymous".org_role = "Viewer";

      server = {
        root_url = "https://grafana.cloonar.com";
        domain = "grafana.cloonar.com";
        enforce_domain = true;
        enable_gzip = true;
        http_addr = "0.0.0.0";
        http_port = 3001;
      };

      smtp = {
        enabled = true;
        host = "mail.cloonar.com:587";
        user = "grafana@cloonar.com";
        password = "$__file{${config.sops.secrets.grafana-ldap-password.path}}";
        fromAddress = "grafana@cloonar.com";
      };

      database = {
        type = "postgres";
        name = "grafana";
        host = "/run/postgresql";
        user = "grafana";
      };

      security.admin_password = "$__file{${config.sops.secrets.grafana-admin-password.path}}";
    };
    provision = {
      alerting = {
        rules.settings.groups = lib.mkMerge []; # Allows rule groups to be merged (including the one from system/default.nix)
        contactPoints = {
          settings = {
            apiVersion = 1; # As per Grafana provisioning API
            contactPoints = [{
              orgId = 1;
              name = "cp_dominik";
              receivers = [{
                uid = "dominik_pushover_cp_receiver"; # Made UID even more specific
                type = "pushover";
                settings = {
                  apiToken = "\${PUSHOVER_API_TOKEN}";
                  userKey = "\${PUSHOVER_USER_KEY}";
                  device = "iphone";
                  priority = 2;
                  retry = "30s";
                  expire = "2m";
                  sound = "siren";
                  okSound = "magic";
                  message = ''
                    {{ template "default.message" . }}
                  '';
                };
              }];
            }];
          };
        };

        policies = { # Corrected from notificationPolicies to policies
          settings = {
            apiVersion = 1; # As per Grafana provisioning API

            # Grafana's new unified alerting expects a single policy tree per org.
            # For OrgID 1 (default), this defines the root of that tree.
            # The NixOS module should translate this into the correct YAML structure.
            # The `policies` attribute within `settings` usually takes a list of policy trees.
            # For a single default organization, we define one policy tree.
            # Grafana's own YAML examples show a top-level 'route' for the default policy,
            # or a list under 'policies' if you're managing multiple policy sets (less common for basic setup).
            # Given the NixOS option `services.grafana.provision.alerting.policies.settings.policies`,
            # it's likely expecting a list here.
            policies = [{ # This outer list corresponds to the `policies` option
              # orgId = 1; # Usually implicit for the default policy file, but can be specified
              receiver = "cp_dominik"; # This sets the default receiver for the root route

              # The actual routing tree starts here.
              # For a simple setup where all alerts go to one receiver,
              # just setting the top-level 'receiver' is often enough.
              # If more complex routing is needed, 'routes' would be defined here.
              # Example:
              # route = {
              #   receiver = "cp_dominik";
              #   group_by = [ "alertname", "job" ];
              #   # ... other root route settings
              #   routes = [
              #     {
              #       matcher_re = { severity = "critical" };
              #       receiver = "critical_alerts_receiver"; # Another contact point
              #       continue = false;
              #     },
              #     # ... other specific routes
              #   ];
              # };
              # For the simplest case, just defining the receiver at this level should work
              # as the root policy for the default organization.
            }];
            # resetPolicies = false; # Default, set to true to remove existing policies not in this config.
          };
        };
      };
      datasources.settings.datasources = lib.mkMerge []; # Allows datasources to be merged
    };
  };

  services.nginx.virtualHosts."grafana.cloonar.com" = {
    forceSSL = true;
    enableACME = true;
    acmeRoot = null;
    locations."/".extraConfig = "proxy_pass http://localhost:3001;";
  };

  services.postgresql.ensureUsers = [
    {
      name = "grafana";
      ensureDBOwnership = true;
    }
  ];
  services.postgresql.ensureDatabases = [ "grafana" ];
  services.postgresqlBackup.databases = [ "grafana" ];

  sops.secrets = {
    grafana-admin-password.owner = "grafana";
    grafana-ldap-password.owner = "grafana";
    grafana-oauth-secret.owner = "grafana";
    pushover-api-token.owner = "grafana";
    pushover-user-key.owner = "grafana";
  };
}