import _ from "lodash";

const Controls = (state = {
  _ranges: null, /* this comes from initialize, this is universe */
  allGeneNames: null,
  allCellsOnClient: null, /* this comes from cells endpoint, this is world */
  currentCellSelection: null, /* this comes from user actions, all draw components use this, it is created by middleware */
  graphMap: null,
  categoricalAsBooleansMap: null,
  colorAccessor: null,
  colorScale: null,
  opacityForDeselectedCells: .2,
  graphBrushSelection: null,
  continuousSelection: null,
  scatterplotXXaccessor: null, // just easier to read
  scatterplotYYaccessor: null,
  axesHaveBeenDrawn: false,
  __storedStateForCelllist1__: null, /* will need procedural control of brush ie., brush.extent https://bl.ocks.org/micahstubbs/3cda05ca68cba260cb81 */
  __storedStateForCelllist2__: null,
}, action) => {
  switch (action.type) {
  /**********************************
        Keep a copy of 'universe'
  ***********************************/
  case "initialize success":
    return Object.assign({}, state, {
      _ranges: action.data.data.ranges,
      allGeneNames: action.data.data.genes
    });
  case "request cells success":
    const graphMap = {};
    const currentCellSelection = action.data.data.metadata.slice(0);
    _.each(action.data.data.graph, (g) => { graphMap[g[0]] = [g[1], g[2]] });
    _.each(currentCellSelection, (cell) => {
      cell["__selected__"] = true;
      cell["__color__"] = "rgba(0,0,0,1)" /* initial color for all cells in all charts */
    });
    /*
      construct a copy of the ranges object that only has categorical
      replace all counts with bool flags
      ie., everything starts out checked
      we mutate this map in the actions below
    */
    const categoricalAsBooleansMap = {};
    const continuousUserDefinedRanges = {};
    _.each(action.data.data.ranges, (value, key) => {
      if (
        key !== "CellName" &&
        value.options /* it's categorical, it has options instead of ranges */
      ) {
        const optionsAsBooleans = {}
        _.each(value.options, (_value, _key) => {
          optionsAsBooleans[_key] = true;
        })
        categoricalAsBooleansMap[key] = optionsAsBooleans;
      } else if (
        key !== "CellName" &&
        value.range
      ) {
        continuousUserDefinedRanges[key] = null;
      }
    })

    return Object.assign({}, state, {
      allCellsOnClient: action.data.data,
      currentCellSelection,
      graphMap,
      categoricalAsBooleansMap,
      continuousUserDefinedRanges,
      graphBrushSelection: null, /* if we are getting new cells from the server, the layout (probably? definitely?) just changed, so this is now irrelevant, and we WILL need to call a function to reset state of this kind when cells success happens */
    });
  /* * * * * * * * * * * * * * * * * *
            User events
  * * * * * * * * * * * * * * * * * */
  case "parallel coordinates axes have been drawn":
    return Object.assign({}, state, {
      axesHaveBeenDrawn: true
    });
  case "continuous selection using parallel coords brushing": {
    return Object.assign({}, state, {
      continuousSelection: action.data,
      currentCellSelection: action.newSelection /* this comes from middleware */
    });
  }
  case "graph brush selection change":
    return Object.assign({}, state, {
      graphBrushSelection: action.brushCoords, /* this has already been applied in middleware but store it for next time */
      currentCellSelection: action.newSelection /* this comes from middleware */
    })
  case "graph brush deselect":
    return Object.assign({}, state, {
      graphBrushSelection: null,
      currentCellSelection: action.newSelection /* this comes from middleware */
    })
  case "continuous metadata histogram brush":
    return Object.assign({}, state, {
      newContinuousUserDefinedRanges: action.newContinuousUserDefinedRanges, /* this has already been applied in middleware but store it for next time */
      currentCellSelection: action.newSelection /* this comes from middleware */
    })
  case "change opacity deselected cells in 2d graph background":
    return Object.assign({}, state, {
      opacityForDeselectedCells: action.data,
    })
  /*******************************
        Categorical metadata
  *******************************/
  case "categorical metadata filter select":
    return Object.assign({}, state, {
      categoricalAsBooleansMap: action.newCategoricalAsBooleansMap, /* this comes from middleware */
      currentCellSelection: action.newSelection /* this comes from middleware */
    })
  case "categorical metadata filter deselect":
    return Object.assign({}, state, {
      categoricalAsBooleansMap: action.newCategoricalAsBooleansMap, /* this comes from middleware */
      currentCellSelection: action.newSelection /* this comes from middleware */
    })
  case "categorical metadata filter none of these":
    return Object.assign({}, state, {
      categoricalAsBooleansMap: action.newCategoricalAsBooleansMap, /* this comes from middleware */
      currentCellSelection: action.newSelection /* this comes from middleware */
    })
  case "categorical metadata filter all of these":
    return Object.assign({}, state, {
      categoricalAsBooleansMap: action.newCategoricalAsBooleansMap, /* this comes from middleware */
      currentCellSelection: action.newSelection /* this comes from middleware */
    })
  /*******************************
            Color Scale
  *******************************/
  case "color by continuous metadata":
    return Object.assign({}, state, {
      colorAccessor: action.colorAccessor,
      currentCellSelection: action.currentSelectionWithUpdatedColors, /* this comes from middleware */
      colorScale: action.colorScale,
    });
  case "color by expression":
    return Object.assign({}, state, {
      colorAccessor: action.gene,
      currentCellSelection: action.currentSelectionWithUpdatedColors, /* this comes from middleware */
      colorScale: action.colorScale,
    })
  case "color by categorical metadata":
    return Object.assign({}, state, {
      colorAccessor: action.colorAccessor, /* pass the scale through additionally, and it's a legend! */
      currentCellSelection: action.currentSelectionWithUpdatedColors, /* this comes from middleware */
      colorScale: action.colorScale,
    })
  case "store current cell selection as differential set 1":
    return Object.assign({}, state, {
      __storedStateForCelllist1__: action.data
    });
  /*******************************
            Scatterplot
  *******************************/
  case "set scatterplot x":
    return Object.assign({}, state, {
      scatterplotXXaccessor: action.data
    });
  case "set scatterplot y":
    return Object.assign({}, state, {
      scatterplotYYaccessor: action.data
    });
  default:
    return state;
  }
};

export default Controls;