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machine.js

  // Available variables:
  // - Machine
  // - interpret
  // - assign
  // - send
  // - sendParent
  // - spawn
  // - raise
  // - actions
  // - XState (all XState exports)
  
  const fetchMachine = Machine({
    id: 'estimation',
    initial: 'loadingEstimate',
    context:{
      eligFailed:false,
      saveFailed:false,
      calculatedFailed: false
    },
    states: {
      loadingEstimate:{
        on:{
          ESTIMATE_LOAD_FAILURE: 'loadFailed',
          ESTIMATE_LOADED_HAS_ELIG: 'idle',
          ESTIMATE_LOADED_MISSING_ELIG: 'checkingElig'
        }
      },
      loadFailed:{},
      idle:{
        on:{
          CHANGE_ELIG_PARAMS: 'checkingElig',
          CHANGE_OTHER_PARAMS: 'calculatingAllowed',
          RETRY_SAVE: {
            target: 'saving',
            cond: ({saveFailed})=>saveFailed
          },
          RETRY_ELIG_CHECK: {
            target: 'checkingElig',
            cond: ({eligFailed})=>eligFailed
          },
          RETRY_CALC_ALLOWED: {
            target: 'calculatingAllowed',
            cond: ({calculatedFailed})=>calculatedFailed
          },
        }
      },
      checkingElig:{
        on:{
          CHANGE_ELIG_PARAMS: 'checkingElig',
          ELIG_CHECK_SUCCESS: {
            target: 'calculatingAllowed',
            actions: assign({
              eligFailed: ()=> false
            })
          },
          ELIG_CHECK_FAILURE: {
            target: 'saving',
            actions: assign({
              eligFailed: ()=> true
            })
          }
        }
      },
      calculatingAllowed:{
        on:{
          CALCULATE_SUCCESS: {
            target: 'saving',
            actions: assign({
              calculatedFailed: () => false
            })
          },
          CALCULATE_FAILURE: {
            target: 'saving',
            actions: assign({
              calculatedFailed: () => true
            })
          },
          CHANGE_ELIG_PARAMS: 'checkingElig',
          CHANGE_OTHER_PARAMS: 'calculatingAllowed',
        }
      },
      saving:{
        on:{
          CHANGE_ELIG_PARAMS: 'savingWithEligibilityChanges',
          CHANGE_OTHER_PARAMS: 'savingWithChanges',
          SAVE_SUCCESS: {
            target: 'idle',
            actions: assign({
               saveFailed: () => false
            })
          },
          SAVE_FAILURE: {
            target: 'idle',
            actions: assign({
               saveFailed: () => true
            })
          }
        }
      },
      savingWithEligibilityChanges:{
        on:{
          SAVE_SUCCESS: 'checkingElig',
          SAVE_FAILURE: 'checkingElig'
        }
      },
      savingWithChanges:{
        on:{
          SAVE_SUCCESS: 'calculatingAllowed',
          SAVE_FAILURE: 'calculatingAllowed'
        }
      }
    }
  });