1598-detect-entity-change.yaml

version: 1
name: Entity change detection
author: Karl Ostmo
description: |
  Ensure that a change to an entity can be observed
  by a system robot within a single tick.

  In this scenario, the base will first `swap` the
  existing `dial (R)`{=entity} with a `dial (G)`{=entity},
  then immediately `swap` again with a `dial (B)`{=entity}.

  The system robot should be able to detect the presence
  of the `dial (G)`{=entity} before it is `swap`ped a second time.
creative: false
seed: 0
objectives:
  - goal:
      - |
        Turn the light green
    condition: |
      as base {has "flower"};
    prerequisite:
      not: blue_light
  - id: blue_light
    teaser: No blue light
    optional: true
    goal:
      - |
        Turn the light blue
    condition: |
      r <- robotnamed "lockbot";
      as r {ishere "dial (B)"};
robots:
  - name: base
    dir: [1, 0]
    display:
      invisible: true
    devices:
      - hourglass
      - fast grabber
      - logger
      - treads
    inventory:
      - [1, "dial (R)"]
      - [1, "dial (G)"]
      - [1, "dial (B)"]
  - name: lockbot
    system: true
    display:
      invisible: true
    dir: [1, 0]
    program: |
      def doUntilCorrect =
          herenow <- ishere "dial (G)";
          if herenow {
              give base "flower";
          } {
              loc <- whereami;
              surveil loc;
              wait 1000;
              doUntilCorrect;
          }
          end;

      def go =
          doUntilCorrect;
          end;

      go;
    inventory:
      - [1, flower]
solution: |
  move;
  move;
  swap "dial (G)";
  swap "dial (B)";
entities:
  - name: "dial (R)"
    display:
      char: '•'
      attr: red
    description:
      - A red dial
    properties: [known, pickable]
  - name: "dial (G)"
    display:
      char: '•'
      attr: green
    description:
      - A green dial
    properties: [known, pickable]
  - name: "dial (B)"
    display:
      char: '•'
      attr: blue
    description:
      - A blue dial
    properties: [known, pickable]
world:
  dsl: |
    {blank}
  upperleft: [-1, -1]
  offset: false
  palette:
    '.': [grass, erase]
    'B': [grass, erase, base]
    'c': [grass, dial (R), lockbot]
  map: |
    B.c