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machine.js

const targetingMachine = Machine({
  id: "adHoc",
  initial: "targetCategory",
  context: {
    targetType: "host",
    targetSelection: "parameter", // param / exact
    strategy: "random",
    selectedTargets: new Set(),
    targetParams: {
      /*[key]: new Set() */
    },
    targetAll: false,
    sampling: {
      type: "Even",
      percent: 100
    }
  },
  states: {
    targetCategory: {
      on: {
        SELECT_INFRA: "infrastructure",
        SELECT_SERVICES: "services",
        SELECT_ALFI: "applications"
      }
    },
    infrastructure: {
      initial: 'host',
      on: {
        SELECT_HOSTS: ".host",
        SELECT_CONTAINERS: ".container",
        SELECT_KUBERNETES: ".kubernetes"
      },
      states: {
        "host": {
          initial: "random",
          on: {
            SET_RANDOM: {
              target: ".random",
              actions: "setRandomStrategy"
            },
            SET_EXACT: {
              target: ".exact",
              actions: "setExactStrategy"
            }
          },
          states: {
            random: {
              on: {
                ADD_TARGET_PARAM: {
                  actions: "addTargetParam"
                },
                REMOVE_TARGET_PARAM: {
                  actions: "removeTargetParam"
                }
              }
            },
            exact: {
              on: {
                SELECT_TARGET: {
                  actions: "selectTarget"
                },
                DESELECT_TARGET: {
                  actions: "deselectTarget"
                }
              }
            }
          },
        },
        "container": {
          initial: "random",
          on: {
            SET_RANDOM: {
              target: ".random",
              actions: "setRandomStrategy"
            },
            SET_EXACT: {
              target: ".exact",
              actions: "setExactStrategy"
            }
          },
          states: {
            random: {
              on: {
                ADD_TARGET_PARAM: {
                  actions: "addTargetParam"
                },
                REMOVE_TARGET_PARAM: {
                  actions: "removeTargetParam"
                }
              }
            },
            exact: {
              on: {
                SELECT_TARGET: {
                  actions: "selectTarget"
                },
                DESELECT_TARGET: {
                  actions: "deselectTarget"
                }
              }
            }
          }
        },
        "kubernetes": {
          initial: "random",
          states: {
            random: {
              on: {
                ADD_TARGET_PARAM: {
                  actions: "addTargetParam"
                },
                REMOVE_TARGET_PARAM: {
                  actions: "removeTargetParam"
                }
              }
            }
          }
        }
      }
    },
    services: {
      type: 'final'
    },
    applications: {
      type: 'final'
    },
  }
},
  {
    actions: {
      setRandomStrategy: assign({ strategy: "random" }),
      setExactStrategy: assign({ strategy: "exact" }),
      addTargetParam: assign({
        targetParams: (context, event) => {
          const copy = { ...context.targetParams };
          if (copy[event.paramKey]) {
            copy[event.paramKey].add(event.paramValue);
          } else {
            copy[event.paramKey] = new Set([event.paramValue]);
          }
          return copy;
        }
      }),
      removeTargetParam: assign({
        targetParams: (context, event) => {
          const copy = { ...context.targetParams };
          if (copy[event.paramKey]) {
            copy[event.paramKey].delete(event.paramValue);
          }
          return copy;
        }
      }),
      selectTarget: assign({ selectedTargets: (context, event) => context.selectedTargets.add(event.targetId) }),
      deselectTarget: assign({ selectedTargets: (context, event) => context.selectedTargets.delete(event.targetId) })
    }
  }
)