# adapted from https://nixos.org/manual/nixos/stable/index.html#module-services-matrix
{ modulesPath, config, lib, pkgs, ... }:
let
  storage-device = "/dev/disk/by-id/scsi-0DO_Volume_matrix-storage";
  storage-dir = "/srv/matrix-data";
  slackbridge-dir = "${storage-dir}/slackbridge";
  pantalaimon-dir = "${storage-dir}/pantalaimon";
  secrets = builtins.fromJSON (builtins.readFile ./secrets.json);
  slack-reg-source-yaml = (builtins.readFile ./slack-registration.yaml);
  slack-reg-dest-yaml = pkgs.writeText "slack-registration.yaml" "${slack-reg-source-yaml}";
  discord-reg-source-yaml = (builtins.readFile ./discord-registration.yaml);
  discord-reg-dest-yaml = pkgs.writeText "discord-registration.yaml" "${discord-reg-source-yaml}";
  discord-envs-src = (builtins.readFile ./discord_envs);
  discord-envs-dst = pkgs.writeText "discord_envs" "${discord-envs-src}";
  fqdn = "${config.networking.hostName}.${config.networking.domain}";
  clientConfig = {
    "m.homeserver".base_url = "https://${fqdn}";
    "server_name" = "${config.networking.domain}";
    "m.identity_server" = {};
  };
  serverConfig."m.server" = "${fqdn}:443";
  mkWellKnown = data: ''
    add_header Content-Type application/json;
    add_header Access-Control-Allow-Origin *;
    return 200 '${builtins.toJSON data}';
  '';
in {
  imports = [
     "${toString modulesPath}/virtualisation/digital-ocean-image.nix"
  ];

  nixpkgs.config = {
    packageOverrides = pkgs: {
      pantalaimon = pkgs.pantalaimon.override { enableDbusUi = false; };
    };
  };

  environment.systemPackages = [ pkgs.jq pkgs.matrix-appservice-slack pkgs.pantalaimon pkgs.olm ];
  services.openssh.enable = true;
  networking.firewall.allowedTCPPorts = [ 22 80 443 ];

  users.users.root.openssh.authorizedKeys.keys = [
    (builtins.readFile "/home/mike/.ssh/id_mops.pub")
  ];

  ### app specific config

  # mount DigitalOcean volume for use by postgres
  fileSystems."${storage-dir}" = {
    device = storage-device;
  };

  networking = {
    hostName = "matrix";
    domain = "waffle.farm";
  };

  services.postgresql = {
    enable = true;
    dataDir = "${storage-dir}/db";

    initialScript = pkgs.writeText "synapse-init.sql" ''
      CREATE ROLE "matrix-synapse" WITH LOGIN PASSWORD '${secrets.matrix.psql_password}';
      CREATE DATABASE "matrix-synapse" WITH OWNER "matrix-synapse"
      TEMPLATE template0
      LC_COLLATE = "C"
      LC_CTYPE = "C";
      CREATE DATABASE slack_bridge;
      CREATE USER slackbridge_user WITH PASSWORD '${secrets.matrix.slack_bridge.psql_password}';
      GRANT ALL PRIVILEGES ON DATABASE slack_bridge to slackbridge_user;
    '';
  };

  services.nginx = {
    enable = true;
    recommendedTlsSettings = true;
    recommendedOptimisation = true;
    recommendedGzipSettings = true;
    recommendedProxySettings = true;

    virtualHosts = {
      "${config.networking.domain}" = {
        enableACME = true;
        forceSSL = true;
        locations."= /.well-known/matrix/server".extraConfig = mkWellKnown serverConfig;
        locations."= /.well-known/matrix/client".extraConfig = mkWellKnown clientConfig;
        locations."~ ^/slackbridge" = {
          proxyPass = "http://localhost:9898";
        };
      };
      # Reverse proxy for Matrix client-server and server-server communication
      ${fqdn} = {
        enableACME = true;
        forceSSL = true;

        # Or do a redirect instead of the 404, or whatever is appropriate for you.
        # But do not put a Matrix Web client here! See the Element web section below.
        locations."/".extraConfig = ''
          return 301 https://chat.waffle.farm;
        '';

        locations."/_matrix" = {
          proxyPass = "http://[::1]:8008";
        };
        locations."/_synapse/client" = {
          proxyPass = "http://[::1]:8008";
        };
      };

      "chat.${config.networking.domain}" = {
        enableACME = true;
        forceSSL = true;
        serverAliases = [
          "chat.${config.networking.domain}"
        ];
        root = pkgs.element-web.override {
          conf = {
            default_server_config = clientConfig;
          };
        };
      };
    };
  };
  services.matrix-synapse = {
    enable = true;
    settings = {
      server_name = config.networking.domain;
      allow_public_rooms_over_federation = true;
      auto_join_rooms = [
        "#cryptic-chat:waffle.farm"
      ];
      app_service_config_files = [
        "${slack-reg-dest-yaml}"
        "${discord-reg-dest-yaml}"
      ];
      listeners = [
        {
          port = 8008;
          bind_addresses = ["::1"];
          type = "http";
          tls = false;
          x_forwarded = true;
          resources = [
            {
              names = [ "client" "federation" ];
              compress = true;
            }
          ];
        }
      ];
    };
    extraConfigFiles = [ "${storage-dir}/matrix_cfg" ];
  };
  security.acme.acceptTerms = true;
  security.acme.certs = {
    "${fqdn}".email = "mike@betamike.com";
    "${config.networking.domain}".email = "mike@betamike.com";
    "chat.${config.networking.domain}".email = "mike@betamike.com";
  };

  users.users.slackbridge = {
    home = slackbridge-dir;
    createHome = true;
    isNormalUser = true;
  };

#  systemd.services.matrix-appservice-slack = let
#  slackbridge-config-file = pkgs.writeText "matrix-slack-bridge-config.yaml" ''
#homeserver:
#  server_name: waffle.farm
#  url: http://[::1]:8008
#  media_url: "http://matrix.waffle.farm"
#  appservice_host: localhost
#  appservice_port: 8090
#username_prefix: "slack_"
#
#db:
#  engine: "postgres"
#  connectionString: "postgresql://slackbridge_user:${secrets.matrix.slack_bridge.psql_password}@localhost/slack_bridge"
#
#matrix_admin_room: "!tuUJADDNODYliJTxYK:waffle.farm"
#
#rtm:
#  enable: true
#  logging: "debug"
#
#slack_hook_port: 9898
#inbound_uri_prefix: "https://waffle.farm/slackbridge/"
#
## Optional. Allow users to add channels dynamically by using oauth, or puppet themselves.
##
#oauth2:
#  client_id: "4494054004.1702274627236"
#  client_secret: "${secrets.matrix.slack_bridge.client_secret}"
#  redirect_prefix: "https://waffle.farm/slackbridge/oauth"
#
## Optional. Enable metrics reporting on http://0.0.0.0:bridgePort/metrics which can be scraped by prometheus
#enable_metrics: true
#
#provisioning:
#  enabled: true
#  require_public_room: false
#  allow_private_channels: true
#  limits:
#    room_count: 20
#    team_count: 1
#
#puppeting:
#  enabled: true
#  onboard_users: true
#
#logging:
#  console: "debug"
#
#bot_profile:
#  displayname: "Slack Bridger"
#
#team_sync:
#  T04EJ1L04:
#    channels:
#      enabled: true
#    whitelist:
#      # bot-test
#      - C04FKFUHK
#      # generic-gaming
#      - C2EEUE9UY
#
#    alias_prefix: "slack_"
#    users:
#      enabled: true
#  # default for all other teams
#  all:
#    channels:
#      enabled: false
#
#encryption:
#  enabled: true
#  pantalaimon_url: "http://localhost:8009"
#    '';
#  in {
#    enable = false;
#    description = "matrix-appservice-slack daemon";
#    wantedBy = [ "multi-user.target" ];
#    serviceConfig = {
#      Type = "simple";
#      ExecStart = "${pkgs.matrix-appservice-slack}/bin/matrix-appservice-slack -c ${slackbridge-config-file} -f ${slack-reg-dest-yaml} -p 8090";
#      User = "slackbridge";
#      Restart = "always";
#    };
#  };

  users.users.pantalaimon = {
    home = pantalaimon-dir;
    createHome = true;
    isNormalUser = true;
  };

  systemd.services.pantalaimon = let
  pantalaimon-config-file = pkgs.writeText "pantalaimon.conf" ''
[local-matrix]
Homeserver = http://localhost:8008
ListenAddress = localhost
ListenPort = 8009
Notifications = off
UseKeyring = no
IgnoreVerification = True
    '';
  in {
    enable = true;
    description = "pantalaimon daemon";
    wantedBy = [ "multi-user.target" ];
    serviceConfig = {
      Type = "simple";
      ExecStart = "${pkgs.pantalaimon}/bin/pantalaimon -c ${pantalaimon-config-file} --data-path ${pantalaimon-dir}";
      User = "pantalaimon";
      Restart = "always";
    };
  };

#   services.matrix-appservice-discord = {
#     enable = true;
#     settings = {
#       bridge = {
#         domain = "waffle.farm";
#         homeserverUrl = "https://matrix.waffle.farm";
#         enableSelfServiceBridging = true;
#         disableJoinLeaveNotifications = true;
#         disableInviteNotifications = true;
#       };
#     };
#     url = "http://localhost:8008";
#     environmentFile = "${discord-envs-dst}";
#   };

}