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machine.js

  // Available variables:
  // - Machine
  // - interpret
  // - assign
  // - send
  // - sendParent
  // - spawn
  // - raise
  // - actions
  // - XState (all XState exports)
  const inProgressStates = {
  initial: 'in_progress',
  states: {
    in_progress: {
      on: {
        ADD_DOC_TO_REVIEW: { target: 'in_review' }
      }
    },
    in_review: {
      on: {
        ALL_DOC_APPROVED: { target: 'in_progress' }
      }
    }
  }
};
  
  const fetchMachine = Machine({
    id: 'amt_status',
    initial: 'idle',
    context: {
      retries: 0,
      validationRequired: true
    },
    states: {
      idle: {
        on: {
          REQUEST: 'amt_request',
          CREATE_AMT: 'to_plan',
        }
      },
      amt_request: {
        on: {
          AFFECT: 'to_plan',
          REJECT_REQUEST: 'request_declined'
        }
      },
      to_plan: {
        on: {
          ADD_EVENT: 'in_progress'
        }
      },
      in_progress: {
        on: {
          DECLINE_AMT: 'amt_declined',
          ALL_TASKS_FINISHED: 'should_approve_amt'
        },
        ...inProgressStates,
      },

      should_approve_amt: {
        on: {
          APPROVAL_NEEDED: 'to_approve',
          APPROVAL_NOT_NEEDED: 'amt_done' 
        }
      },
      to_approve: {
        on: {
          APPROVE_AMT: 'amt_validated'
        }
      },
            request_declined: {
        type: 'final'
      },
      amt_declined: {
        type: 'final'
      },
      amt_validated: {
        type: 'final'
      },
      amt_done: {
        type: 'final'
      },
    }
  });