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machine.js

const fetchMachine = Machine({
  id: 'fetch',
  initial: 'preprocessing',
  context: {
    retries: 0,
  },
  states: {
    preprocessing: {
      on: {
        ERROR: 'manualIntervention',
        SUCCESS: 'pageManagement',
      },
    },
    manualIntervention: {
      on: {
        RESOLVE_INTERVENTION: 'businessRules',
      },
    },
    pageManagement: {
      initial: 'checkHasPageManagement',
      onDone: 'entityExtraction',
      states: {
        checkHasPageManagement: {
          on: {
            HAS_PAGE_MANAGEMENT: 'withPageManagement',
            NO_PAGE_MANAGEMENT: 'eachFileIsDocument',
          },
        },
        withPageManagement: {
          initial: 'documentTypePredictionPerPage',
          onDone: 'success',
          states: {
            documentTypePredictionPerPage: {
              on: {
                SUCCESS: 'organizePagesML',
                ERROR: 'manualIntervention',
              },
            },
            organizePagesML: {
              on: {
                ERROR: 'manualIntervention',
                SUCCESS: 'success',
              },
            },
            manualIntervention: {
              on: {
                RESOLVE_INTERVENTION: 'success',
              },
            },
            success: { type: 'final' },
          },
        },
        success: { type: 'final' },
        eachFileIsDocument: {
          initial: 'createDocuments',
          onDone: 'success',
          states: {
            createDocuments: {
              on: {
                DONE: 'documentTypePrediction',
              },
            },
            success: { type: 'final' },
            documentTypePrediction: {
              on: {
                ERROR: 'manualIntervention',
                SUCCESS: 'success',
              },
            },
            manualIntervention: {
              on: {
                RESOLVE_INTERVENTION: 'success',
              },
            },
          },
        },
      },
    },
    entityExtraction: {
      onDone: 'businessRules',
      initial: 'extractEntities',
      states: {
        extractEntities: {
          type: 'parallel',
          states: {
            textEntityExtraction: {},
            imageEntityExtraction: {},
          },
          on: {
            SUCCESS: 'success',
            ERROR: 'manualIntervention',
          },
        },
        success: { type: 'final' },
        manualIntervention: {
          on: {
            RESOLVE_INTERVENTION: 'success',
          },
        },
      },
    },
    businessRules: {
      initial: 'executeRules',
      onDone: 'output',
      states: {
        executeRules: {
          on: {
            RULES_FAILED: 'manualIntervention',
            SUCCESS: 'success',
          },
        },
        success: { type: 'final' },
        manualIntervention: {
          on: {
            RESOLVE_INTERVENTION: 'success',
          },
        },
      },
    },
    output: { type: 'final' },
  },
});