{ config, lib, pkgs, ... }:

with lib;

let cfg = config.services.fieldpoc;
in {
  imports = [
    ./dhcp.nix
  ];

  options = {
    services.fieldpoc = {
      enable = mkEnableOption "fieldpoc";
      # TODO: config
      #config = mkOption {
      #  type = with types; attrsOf anything;
      #  default = { };
      #};
    };
  };

  config = mkIf cfg.enable {
    environment.systemPackages = with pkgs; [
      python3.pkgs.fieldpoc
    ];

    services.postgresql = {
      enable = true;
      initialScript = pkgs.writeText "backend-initScript" ''
        CREATE ROLE fieldpoc WITH LOGIN PASSWORD 'fieldpoc' CREATEDB;
        CREATE DATABASE fieldpoc;
        GRANT ALL PRIVILEGES ON DATABASE fieldpoc TO fieldpoc;
      '';
    };

    services.yate = {
      enable = true;
      config = {
        extmodule."listener ywsd" = {
          type = "tcp";
          addr = "127.0.0.1";
          port = "5039";
        };
        cdrbuild.parameters.X-Eventphone-Id = "false";
        pgsqldb.default = {
          host = "localhost";
          port = "5432";
          database = "fieldpoc";
          user = "fieldpoc";
          password = "fieldpoc";
        };
        register = {
          general = {
            expires = 30;
            "user.auth" = "yes";
            "user.register" = "yes";
            "user.unregister" = "yes";
            "engine.timer" = "yes";
            "call.cdr" = "yes";
            "linetracker" = "yes";
          };
          default = {
            priority = 30;
            account = "default";
          };
          "user.auth" = {
            query = "SELECT password FROM users WHERE username='\${username}' AND password IS NOT NULL AND password<>'' AND type='user' LIMIT 1;";
            result = "password";
          };
          "user.register".query = "INSERT INTO registrations (username, location, oconnection_id, expires) VALUES ('\${username}', '\${data}', '\${oconnection_id}', NOW() + INTERVAL '\${expires} s') ON CONFLICT ON CONSTRAINT uniq_registrations DO UPDATE SET expires = NOW() + INTERVAL '\${expires} s'";
          "user.unregister".query = "DELETE FROM registrations WHERE (username = '\${username}' AND location = '\${data}' AND oconnection_id = '\${connection_id}') OR ('\${username}' = '' AND '\${data}' = '' AND oconnection_id = '\${connection_id}')";
          "engine.timer".query = "DELETE FROM registrations WHERE expires<=CURRENT_TIMESTAMP;";
          "call.cdr".critial = "no";
          "linetracker" = {
            critical = "yes";
            initquery = "UPDATE users SET inuse=0 WHERE inuse is not NULL;DELETE from active_calls;";
            cdr_initialize = "UPDATE users SET inuse=inuse+1 WHERE username='\${external}';INSERT INTO active_calls SELECT username, x_eventphone_id FROM (SELECT '\${external}' as username, '\${X-Eventphone-Id}' as x_eventphone_id, '\${direction}' as direction) as active_call WHERE x_eventphone_id != '' AND x_eventphone_id IS NOT NULL and direction = 'outgoing';";
            cdr_finalize = "UPDATE users SET inuse=(CASE WHEN inuse>0 THEN inuse-1 ELSE 0 END) WHERE username='\${external}';DELETE FROM active_calls WHERE username = '\${external}' AND  x_eventphone_id = '\${X-Eventphone-Id}' AND '\${direction}' = 'outgoing';";
          };
        };
      };
    };
  };
}