import { useCallback } from "react";
import { useTranslation } from "react-i18next";
import {
  ToolType,
  useToolOperation,
  ToolOperationConfig,
} from "@app/hooks/tools/shared/useToolOperation";
import { createStandardErrorHandler } from "@app/utils/toolErrorHandler";
import {
  RemoveBlanksParameters,
  defaultParameters,
} from "@app/hooks/tools/removeBlanks/useRemoveBlanksParameters";
import { useToolResources } from "@app/hooks/tools/shared/useToolResources";

export const buildRemoveBlanksFormData = (
  parameters: RemoveBlanksParameters,
  file: File,
): FormData => {
  const formData = new FormData();
  formData.append("fileInput", file);
  formData.append("threshold", String(parameters.threshold));
  formData.append("whitePercent", String(parameters.whitePercent));
  // Note: includeBlankPages is not sent to backend as it always returns both files in a ZIP
  return formData;
};

export const removeBlanksOperationConfig = {
  toolType: ToolType.singleFile,
  buildFormData: buildRemoveBlanksFormData,
  operationType: "removeBlanks",
  endpoint: "/api/v1/misc/remove-blanks",
  defaultParameters,
} as const satisfies ToolOperationConfig<RemoveBlanksParameters>;

export const useRemoveBlanksOperation = () => {
  const { t } = useTranslation();
  const { extractZipFiles } = useToolResources();

  const responseHandler = useCallback(
    async (blob: Blob): Promise<File[]> => {
      // Backend always returns a ZIP file containing the processed PDFs
      return await extractZipFiles(blob);
    },
    [extractZipFiles],
  );

  return useToolOperation<RemoveBlanksParameters>({
    ...removeBlanksOperationConfig,
    responseHandler,
    getErrorMessage: createStandardErrorHandler(
      t("removeBlanks.error.failed", "Failed to remove blank pages"),
    ),
  });
};
