{ lib, config, inputs, pkgs, ... }:
let
  root_host = "grimmauld.de";
  matrix_host = "matrix.${root_host}";
in {
services.postgresql = {
    enable = true;
    # CREATE DATABASE synapse ENCODING 'UTF8' LC_COLLATE='C' LC_CTYPE='C' template=template0 OWNER synapse;
    ensureDatabases = [ "synapse" ];
    package = pkgs.postgresql_15;
    ensureUsers = [
      {
        name = "synapse";
        ensureDBOwnership = true;
      }
    ];
    authentication = pkgs.lib.mkOverride 10 ''
      #type database  DBuser  auth-method
local   all             postgres                                peer
local   all             all                                     peer
host    all             all             127.0.0.1/32            md5
host    synapse         matrix-synapse         ::1/128                 md5
host    all             all             ::1/128                 md5
local   replication     all                                     peer
host    replication     all             127.0.0.1/32            md5
host    replication     all             ::1/128                 md5
    '';
    identMap = ''
    # ArbitraryMapName systemUser DBUser
       superuser_map      root      postgres
       superuser_map      matrix-synapse synapse
       superuser_map      postgres  postgres
       # Let other names login as themselves
       superuser_map      /^(.*)$   \1
  '';
  };

  systemd.services.postgresql.postStart = let
    password_file_path = config.age.secrets.synapse_db_pass.path;
  in ''
    $PSQL -tA <<'EOF'
      DO $$
      DECLARE password TEXT;
      BEGIN
        password := trim(both from replace(pg_read_file('${password_file_path}'), E'\n', '''));
        EXECUTE format('ALTER ROLE synapse WITH PASSWORD '''%s''';', password);
      END $$;
    EOF
  '';

  services.matrix-synapse-next = {
    enable = true;

    workers.federationSenders = 1;
    workers.federationReceivers = 1;
    workers.initialSyncers = 1;
    workers.normalSyncers = 1;
    workers.eventPersisters = 2;
    workers.useUserDirectoryWorker = true;

    enableNginx = true;
    enableSlidingSync = false;

    settings = {
      server_name = root_host;
      public_baseurl = "https://${root_host}";
      enable_registration = false;
      enable_registration_without_verification = true;

#      registrations_require_3pid = [ "email" ];
      database = {
        name = "psycopg2";
        args = {
          host = "localhost";
          port = 5432;
          dbname = "synapse";
          user = "synapse";
          cp_min = 5;
          cp_max = 10;
          client_encoding = "auto";
          passfile = config.age.secrets.synapse_db_pass_prepared.path;
        };
      };
    };  
  };
  services.redis.servers."".enable = true;

  age.secrets.synapse_db_pass = {
    file = ./secrets/synapse_db_pass.age;
    owner = "postgres";
    group = "postgres";
  };
  age.secrets.synapse_db_pass_prepared = {
    file = ./secrets/synapse_db_pass_prepared.age;
    owner = "matrix-synapse";
    group = "matrix-synapse";
    mode = "0600";
  };

  services.nginx = {
    enable = true;
    virtualHosts."${root_host}" = {
      forceSSL = true;
      enableACME = false; # use the cert above, not some weird one that matrix-synapse module supplies
      useACMEHost = root_host;
      locations."/.well-known/matrix/server" = {
        return = "200 '{\"m.server\":\"${matrix_host}:443\"}'";
        extraConfig = ''
default_type application/json;
add_header Access-Control-Allow-Origin *;
add_header Accept-Ranges bytes;'';
      };
      locations."/.well-known/matrix/client" = {
        return = "200 '{\"m.homeserver\": {\"base_url\": \"https://${matrix_host}\"}}'";
        extraConfig = ''
add_header Access-Control-Allow-Origin *;
default_type application/json;
'';
      };
      locations."/_matrix" = {
        proxyPass = "http://$synapse_backend";
        extraConfig = ''
          add_header X-debug-backend $synapse_backend;
          add_header X-debug-group $synapse_uri_group;
          client_max_body_size ${config.services.matrix-synapse-next.settings.max_upload_size};
          proxy_read_timeout 10m;
        '';
      };
      locations."~ ^/_matrix/client/(r0|v3)/sync$" = {
        proxyPass = "http://$synapse_backend";
        extraConfig = ''
          proxy_read_timeout 1h;
        '';
      };
      locations."~ ^/_matrix/client/(api/v1|r0|v3)/initialSync$" = {
        proxyPass = "http://synapse_worker_initial_sync";
        extraConfig = ''
          proxy_read_timeout 1h;
        '';
      };
      locations."~ ^/_matrix/client/(api/v1|r0|v3)/rooms/[^/]+/initialSync$" = {
        proxyPass = "http://synapse_worker_initial_sync";
        extraConfig = ''
          proxy_read_timeout 1h;
        '';
      };
      locations."/_synapse/client" = {
        proxyPass = "http://$synapse_backend";
      };
      locations."/.well-known/matrix" = {
        proxyPass = "http://$synapse_backend";
      };
    };
  };
#  networking.firewall.allowedTCPPorts = [ 8448 8008 ];
}