import { api } from 'dicomweb-client';
import {
  mapParams,
  search as qidoSearch,
  seriesInStudy,
  processResults,
  processSeriesResults,
} from './qido.js';
import { DicomMetadataStore, IWebApiDataSource, utils } from '@ohif/core';

import getImageId from './utils/getImageId';
import * as dcmjs from 'dcmjs';
import {
  retrieveStudyMetadata,
  deleteStudyMetadataPromise,
} from './retrieveStudyMetadata.js';

const { DicomMetaDictionary, DicomDict } = dcmjs.data;

const { naturalizeDataset, denaturalizeDataset } = DicomMetaDictionary;
const { urlUtil } = utils;

const ImplementationClassUID =
  '2.25.270695996825855179949881587723571202391.2.0.0';
const ImplementationVersionName = 'OHIF-VIEWER-2.0.0';
const EXPLICIT_VR_LITTLE_ENDIAN = '1.2.840.10008.1.2.1';

/**
 *
 * @param {string} name - Data source name
 * @param {string} wadoUriRoot - Legacy? (potentially unused/replaced)
 * @param {string} qidoRoot - Base URL to use for QIDO requests
 * @param {string} wadoRoot - Base URL to use for WADO requests
 * @param {boolean} qidoSupportsIncludeField - Whether QIDO supports the "Include" option to request additional fields in response
 * @param {string} imageRengering - wadors | ? (unsure of where/how this is used)
 * @param {string} thumbnailRendering - wadors | ? (unsure of where/how this is used)
 * @param {bool} lazyLoadStudy - "enableStudyLazyLoad"; Request series meta async instead of blocking
 */
function createDicomWebApi(dicomWebConfig) {
  const { qidoRoot, wadoRoot, enableStudyLazyLoad } = dicomWebConfig;

  const qidoConfig = {
    url: qidoRoot,
    // headers: DICOMWeb.getAuthorizationHeader(server),
  };

  const wadoConfig = {
    url: wadoRoot,
  };

  // TODO -> Two clients sucks, but its better than 1000.
  // TODO -> We'll need to merge auth later.
  const qidoDicomWebClient = new api.DICOMwebClient(qidoConfig);
  const wadoDicomWebClient = new api.DICOMwebClient(wadoConfig);

  return IWebApiDataSource.create({
    query: {
      studies: {
        mapParams: mapParams.bind(),
        search: async function(origParams) {
          const { studyInstanceUid, seriesInstanceUid, ...mappedParams } =
            mapParams(origParams) || {};

          const results = await qidoSearch(
            qidoDicomWebClient,
            undefined,
            undefined,
            mappedParams
          );

          return processResults(results);
        },
        processResults: processResults.bind(),
      },
      series: {
        // mapParams: mapParams.bind(),
        search: async function(studyInstanceUid) {
          const results = await seriesInStudy(
            qidoDicomWebClient,
            studyInstanceUid
          );

          return processSeriesResults(results);
        },
        // processResults: processResults.bind(),
      },
      instances: {
        search: (studyInstanceUid, queryParameters) =>
          qidoSearch.call(
            undefined,
            qidoDicomWebClient,
            studyInstanceUid,
            null,
            queryParameters
          ),
      },
    },
    retrieve: {
      series: {
        // TODO: change queryParams to `StudyInstanceUID` for now?
        // Conduct query, return a promise like others
        // Await this call and add to DicomMetadataStore after receiving result
        metadata: (queryParams, callback) => {
          let { StudyInstanceUIDs } = urlUtil.parse(queryParams, true);

          StudyInstanceUIDs = urlUtil.paramString.parseParam(StudyInstanceUIDs);

          if (!StudyInstanceUIDs) {
            throw new Error(
              'Incomplete queryParams, missing StudyInstanceUIDs'
            );
          }

          const storeInstances = instances => {
            const naturalizedInstances = instances.map(naturalizeDataset);

            DicomMetadataStore.addInstances(naturalizedInstances);
            callback(naturalizedInstances);
          };

          const studyPromises = StudyInstanceUIDs.map(StudyInstanceUID =>
            retrieveStudyMetadata(
              wadoDicomWebClient,
              StudyInstanceUID,
              enableStudyLazyLoad
            )
          );

          studyPromises.forEach(studyPromise => {
            studyPromise.then(seriesPromises => {
              seriesPromises.forEach(seriesPromise => {
                seriesPromise.then(instances => {
                  storeInstances(instances);
                });
              });
            });
          });
        },
      },
    },
    store: {
      dicom: async dataset => {
        const meta = {
          FileMetaInformationVersion:
            dataset._meta.FileMetaInformationVersion.Value,
          MediaStorageSOPClassUID: dataset.SOPClassUID,
          MediaStorageSOPInstanceUID: dataset.SOPInstanceUID,
          TransferSyntaxUID: EXPLICIT_VR_LITTLE_ENDIAN,
          ImplementationClassUID,
          ImplementationVersionName,
        };

        const denaturalized = denaturalizeDataset(meta);
        const dicomDict = new DicomDict(denaturalized);

        dicomDict.dict = denaturalizeDataset(dataset);

        const part10Buffer = dicomDict.write();

        const options = {
          datasets: [part10Buffer],
        };

        await wadoDicomWebClient.storeInstances(options);
      },
    },
    retrieveSeriesMetadata: async ({ StudyInstanceUID } = {}) => {
      if (!StudyInstanceUID) {
        throw new Error(
          'Unable to query for SeriesMetadata without StudyInstanceUID'
        );
      }

      // Get Series
      const seriesPromises = await retrieveStudyMetadata(
        wadoDicomWebClient,
        StudyInstanceUID,
        enableStudyLazyLoad
      );

      // Async load series, store as retrieved
      function storeInstances(instances) {
        const naturalizedInstances = instances.map(naturalizeDataset);

        DicomMetadataStore.addInstances(naturalizedInstances);
      }

      seriesPromises.forEach(async seriesPromise => {
        const instances = await seriesPromise;
        storeInstances(instances);
      });
    },
    deleteStudyMetadataPromise,
    getImageIdsForDisplaySet(displaySet) {
      const images = displaySet.images;
      const imageIds = [];

      if (!images) {
        return imageIds;
      }

      displaySet.images.forEach(instance => {
        const NumberOfFrames = instance.NumberOfFrames;

        if (NumberOfFrames > 1) {
          for (let i = 0; i < NumberOfFrames; i++) {
            const imageId = getImageId({
              instance,
              frame: i,
              config: dicomWebConfig,
            });
            imageIds.push(imageId);
          }
        } else {
          const imageId = getImageId({ instance, config: dicomWebConfig });
          imageIds.push(imageId);
        }
      });

      return imageIds;
    },
  });
}

export { createDicomWebApi };