import React from 'react';
import OHIF from '@ohif/core';
import { Dialog, Input } from '@ohif/ui';
import cornerstone from 'cornerstone-core';
import csTools from 'cornerstone-tools';
import merge from 'lodash.merge';
import initCornerstoneTools from './initCornerstoneTools.js';
import cornerstoneTools from 'cornerstone-tools';
import initWADOImageLoader from './initWADOImageLoader.js';
import measurementServiceMappingsFactory from './utils/measurementServiceMappings/measurementServiceMappingsFactory';
//
import { setEnabledElement } from './state';

/**
 *
 * @param {Object} servicesManager
 * @param {Object} configuration
 * @param {Object|Array} configuration.csToolsConfig
 */
export default function init({ servicesManager, configuration }) {
  const {
    UIDialogService,
    MeasurementService,
    DisplaySetService,
  } = servicesManager.services;

  const callInputDialog = (data, event, callback) => {
    if (UIDialogService) {
      let dialogId = UIDialogService.create({
        centralize: true,
        isDraggable: false,
        content: Dialog,
        useLastPosition: false,
        showOverlay: true,
        contentProps: {
          title: 'Enter your annotation',
          value: { label: data ? data.text : '' },
          noCloseButton: true,
          onClose: () => UIDialogService.dismiss({ id: dialogId }),
          actions: [
            { id: 'cancel', text: 'Cancel', type: 'secondary' },
            { id: 'save', text: 'Save', type: 'primary' },
          ],
          onSubmit: ({ action, value }) => {
            switch (action.id) {
              case 'save':
                callback(value.label);
                break;
              case 'cancel':
                callback();
                break;
            }
            UIDialogService.dismiss({ id: dialogId });
          },
          body: ({ value, setValue }) => {
            const onChangeHandler = event => {
              event.persist();
              setValue(value => ({ ...value, label: event.target.value }));
            };
            const onKeyPressHandler = event => {
              if (event.key === 'Enter') {
                onSubmitHandler({ value, action: { id: 'save' } });
              }
            };
            return (
              <div className="p-4 bg-primary-dark">
                <Input
                  autoFocus
                  className="mt-2 bg-black border-primary-main"
                  type="text"
                  containerClassName="mr-2"
                  value={value.label}
                  onChange={onChangeHandler}
                  onKeyPress={onKeyPressHandler}
                />
              </div>
            );
          },
        },
      });
    }
  };

  const { csToolsConfig } = configuration;
  const metadataProvider = OHIF.cornerstone.metadataProvider;

  cornerstone.metaData.addProvider(
    metadataProvider.get.bind(metadataProvider),
    9999
  );

  // ~~
  const defaultCsToolsConfig = csToolsConfig || {
    globalToolSyncEnabled: true,
    showSVGCursors: true,
    autoResizeViewports: false,
  };

  initCornerstoneTools(defaultCsToolsConfig);
  // TODO: Extensions are still registered at time of registration globally
  // These should be registered as a part of mode route spin up,
  // and they need to self-clean on mode route destroy
  // THIS
  // is a way for extensions that "depend" on this extension to notify it of
  // new cornerstone enabled elements so it's commands continue to work.
  const handleOhifCornerstoneEnabledElementEvent = function(evt) {
    const { viewportIndex, enabledElement } = evt.detail;

    setEnabledElement(viewportIndex, enabledElement);
  };

  document.addEventListener(
    'ohif-cornerstone-enabled-element-event',
    handleOhifCornerstoneEnabledElementEvent
  );

  const toolsGroupedByType = {
    touch: [csTools.PanMultiTouchTool, csTools.ZoomTouchPinchTool],
    annotations: [
      csTools.ArrowAnnotateTool,
      csTools.BidirectionalTool,
      csTools.LengthTool,
      csTools.AngleTool,
      csTools.FreehandRoiTool,
      csTools.EllipticalRoiTool,
      csTools.DragProbeTool,
      csTools.RectangleRoiTool,
    ],
    other: [
      csTools.PanTool,
      csTools.ZoomTool,
      csTools.WwwcTool,
      csTools.WwwcRegionTool,
      csTools.MagnifyTool,
      csTools.StackScrollTool,
      csTools.StackScrollMouseWheelTool,
      csTools.OverlayTool,
    ],
  };

  let tools = [];
  Object.keys(toolsGroupedByType).forEach(toolsGroup =>
    tools.push(...toolsGroupedByType[toolsGroup])
  );

  /* Measurement Service */
  _connectToolsToMeasurementService(MeasurementService, DisplaySetService);

  /* Add extension tools configuration here. */
  const internalToolsConfig = {
    ArrowAnnotate: {
      configuration: {
        getTextCallback: (callback, eventDetails) =>
          callInputDialog(null, eventDetails, callback),
        changeTextCallback: (data, eventDetails, callback) =>
          callInputDialog(data, eventDetails, callback),
        allowEmptyLabel: true,
      },
    },
    DragProbe: {
      defaultStrategy: 'minimal',
    },
  };

  /* Abstract tools configuration using extension configuration. */
  const parseToolProps = (props, tool) => {
    const { annotations } = toolsGroupedByType;
    // An alternative approach would be to remove the `drawHandlesOnHover` config
    // from the supported configuration properties in `cornerstone-tools`
    const toolsWithHideableHandles = annotations.filter(
      tool => !['RectangleRoiTool', 'EllipticalRoiTool'].includes(tool.name)
    );

    let parsedProps = { ...props };

    /**
     * drawHandles - Never/Always show handles
     * drawHandlesOnHover - Only show handles on handle hover (pointNearHandle)
     * hideHandlesIfMoving - Hides the handles whilst you are moving them, for better visibility.
     *
     * Does not apply to tools where handles aren't placed in predictable
     * locations.
     */
    if (
      configuration.hideHandles !== false &&
      toolsWithHideableHandles.includes(tool)
    ) {
      if (props.configuration) {
        parsedProps.configuration.drawHandlesOnHover = true;
        parsedProps.configuration.hideHandlesIfMoving = true;
      } else {
        parsedProps.configuration = {
          drawHandlesOnHover: true,
          hideHandlesIfMoving: true,
        };
      }
    }

    return parsedProps;
  };

  /* Add tools with its custom props through extension configuration. */
  tools.forEach(tool => {
    const toolName = new tool().name;
    const externalToolsConfig = configuration.tools || {};
    const externalToolProps = externalToolsConfig[toolName] || {};
    const internalToolProps = internalToolsConfig[toolName] || {};
    const props = merge(
      internalToolProps,
      parseToolProps(externalToolProps, tool)
    );
    csTools.addTool(tool, props);
  });

  // TODO -> We need a better way to do this with maybe global tool state setting all tools passive.
  const BaseAnnotationTool = csTools.importInternal('base/BaseAnnotationTool');
  tools.forEach(tool => {
    if (tool.prototype instanceof BaseAnnotationTool) {
      // BaseAnnotationTool would likely come from csTools lib exports
      const toolName = new tool().name;
      csTools.setToolPassive(toolName); // there may be a better place to determine name; may not be on uninstantiated class
    }
  });

  csTools.setToolActive('Pan', { mouseButtonMask: 4 });
  csTools.setToolActive('Zoom', { mouseButtonMask: 2 });
  csTools.setToolActive('Wwwc', { mouseButtonMask: 1 });
  csTools.setToolActive('StackScrollMouseWheel', {}); // TODO: Empty options should not be required
  csTools.setToolActive('PanMultiTouch', { pointers: 2 }); // TODO: Better error if no options
  csTools.setToolActive('ZoomTouchPinch', {});
  csTools.setToolEnabled('Overlay', {});
}

const _initMeasurementService = (MeasurementService, DisplaySetService) => {
  /* Initialization */
  const {
    Length,
    Bidirectional,
    EllipticalRoi,
    ArrowAnnotate,
  } = measurementServiceMappingsFactory(MeasurementService, DisplaySetService);
  const csToolsVer4MeasurementSource = MeasurementService.createSource(
    'CornerstoneTools',
    '4'
  );

  /* Mappings */
  MeasurementService.addMapping(
    csToolsVer4MeasurementSource,
    'Length',
    Length.matchingCriteria,
    Length.toAnnotation,
    Length.toMeasurement
  );

  MeasurementService.addMapping(
    csToolsVer4MeasurementSource,
    'Bidirectional',
    Bidirectional.matchingCriteria,
    Bidirectional.toAnnotation,
    Bidirectional.toMeasurement
  );

  MeasurementService.addMapping(
    csToolsVer4MeasurementSource,
    'EllipticalRoi',
    EllipticalRoi.matchingCriteria,
    EllipticalRoi.toAnnotation,
    EllipticalRoi.toMeasurement
  );

  MeasurementService.addMapping(
    csToolsVer4MeasurementSource,
    'ArrowAnnotate',
    ArrowAnnotate.matchingCriteria,
    ArrowAnnotate.toAnnotation,
    ArrowAnnotate.toMeasurement
  );

  return csToolsVer4MeasurementSource;
};

const _connectToolsToMeasurementService = (
  MeasurementService,
  DisplaySetService
) => {
  const csToolsVer4MeasurementSource = _initMeasurementService(
    MeasurementService,
    DisplaySetService
  );
  _connectMeasurementServiceToTools(
    MeasurementService,
    csToolsVer4MeasurementSource
  );
  const { addOrUpdate, remove } = csToolsVer4MeasurementSource;
  const elementEnabledEvt = cornerstone.EVENTS.ELEMENT_ENABLED;

  /* Measurement Service Events */
  cornerstone.events.addEventListener(elementEnabledEvt, evt => {
    // TODO: Debounced update of measurements that are modified

    function addMeasurement(csToolsEvent) {
      console.log('CSTOOLS::addOrUpdate', csToolsEvent, csToolsEvent.detail);

      try {
        const evtDetail = csToolsEvent.detail;
        const { toolName, toolType, measurementData } = evtDetail;
        const csToolName = toolName || measurementData.toolType || toolType;

        const measurementId = addOrUpdate(csToolName, evtDetail);

        if (measurementId) {
          measurementData.id = measurementId;
        }
      } catch (error) {
        console.warn('Failed to add measurement:', error);
      }
    }

    function updateMeasurement(csToolsEvent) {
      try {
        if (!csToolsEvent.detail.measurementData.id) {
          return;
        }
        const evtDetail = csToolsEvent.detail;
        const { toolName, toolType, measurementData } = evtDetail;
        const csToolName = toolName || measurementData.toolType || toolType;

        evtDetail.id = csToolsEvent.detail.measurementData.id;
        addOrUpdate(csToolName, evtDetail);
        //
      } catch (error) {
        console.warn('Failed to update measurement:', error);
      }
    }

    /**
     * When csTools fires a removed event, remove the same measurement
     * from the measurement service
     *
     * @param {*} csToolsEvent
     */
    function removeMeasurement(csToolsEvent) {
      console.log('~~ removeEvt', csToolsEvent);
      try {
        if (csToolsEvent.detail.measurementData.id) {
          remove(csToolsEvent.detail.measurementData.id);
        }
      } catch (error) {
        console.warn('Failed to remove measurement:', error);
      }
    }

    const { MEASUREMENTS_CLEARED } = MeasurementService.EVENTS;

    MeasurementService.subscribe(MEASUREMENTS_CLEARED, () => {
      cornerstoneTools.globalImageIdSpecificToolStateManager.restoreToolState(
        {}
      );
    });

    const enabledElement = evt.detail.element;
    const completedEvt = csTools.EVENTS.MEASUREMENT_COMPLETED;
    const updatedEvt = csTools.EVENTS.MEASUREMENT_MODIFIED;
    const removedEvt = csTools.EVENTS.MEASUREMENT_REMOVED;

    enabledElement.addEventListener(completedEvt, addMeasurement);
    enabledElement.addEventListener(updatedEvt, updateMeasurement);
    enabledElement.addEventListener(removedEvt, removeMeasurement);
  });
};

const _connectMeasurementServiceToTools = (
  MeasurementService,
  measurementSource
) => {
  const {
    MEASUREMENTS_CLEARED,
    MEASUREMENT_REMOVED,
  } = MeasurementService.EVENTS;
  const sourceId = measurementSource.id;

  MeasurementService.subscribe(MEASUREMENTS_CLEARED, () => {
    cornerstoneTools.globalImageIdSpecificToolStateManager.restoreToolState({});
    cornerstone.getEnabledElements().forEach(enabledElement => {
      cornerstone.updateImage(enabledElement.element);
    });
  });

  // TODO: This is an unsafe delete
  // Cornerstone-tools should probably expose a more generic "delete by id"
  // And have toolState managers expose a method to find any of their toolState by ID
  // --> csTools.deleteById --> internally checks all registered modules/managers?
  //
  // This implementation assumes a single globalImageIdSpecificToolStateManager
  // It iterates all toolState for all toolTypes, and deletes any with a matching id
  //
  // Could potentially use "source" from event to determine tool type and skip some
  // iterations?
  MeasurementService.subscribe(
    MEASUREMENT_REMOVED,
    ({ source, measurement: removedMeasurementId }) => {
      // THIS POINTS TO ORIGINAL; Not a copy
      const imageIdSpecificToolState = cornerstoneTools.globalImageIdSpecificToolStateManager.saveToolState();

      // ImageId -->
      Object.keys(imageIdSpecificToolState).forEach(imageId => {
        // ImageId --> Tool -->
        Object.keys(imageIdSpecificToolState[imageId]).forEach(toolName => {
          const toolState = imageIdSpecificToolState[imageId][toolName];

          let annotationIndex = toolState.data.length - 1;
          while (annotationIndex >= 0) {
            const annotation = toolState.data[annotationIndex];

            if (annotation.id === removedMeasurementId) {
              toolState.data.splice(annotationIndex, 1);
            }

            annotationIndex--;
          }
        });
      });
    }
  );
};

// const {
//   MEASUREMENT_ADDED,
//   MEASUREMENT_UPDATED,
// } = MeasurementService.EVENTS;

// MeasurementService.subscribe(
//   MEASUREMENT_ADDED,
//   ({ source, measurement }) => {
//     if (![sourceId].includes(source.id)) {
//       const annotation = getAnnotation('Length', measurement.id);

//       console.log(
//         'Measurement Service [Cornerstone]: Measurement added',
//         measurement
//       );
//       console.log('Mapped annotation:', annotation);
//     }
//   }
// );

// MeasurementService.subscribe(
//   MEASUREMENT_UPDATED,
//   ({ source, measurement }) => {
//     if (![sourceId].includes(source.id)) {
//       const annotation = getAnnotation('Length', measurement.id);

//       console.log(
//         'Measurement Service [Cornerstone]: Measurement updated',
//         measurement
//       );
//       console.log('Mapped annotation:', annotation);
//     }
//   }
// );