// jshint esversion: 6
/* rc slider https://www.npmjs.com/package/rc-slider */

import React from "react";
import _ from "lodash";
import * as d3 from "d3";
import fuzzysort from "fuzzysort";

import { connect } from "react-redux";
import { MenuItem, Button } from "@blueprintjs/core";
import { Suggest } from "@blueprintjs/select";
import HistogramBrush from "../brushableHistogram";
import * as globals from "../../globals";
import actions from "../../actions";
import { postUserErrorToast } from "../framework/toasters";
import ExpressionButtons from "./expressionButtons";

const renderGene = (fuzzySortResult, { handleClick, modifiers, query }) => {
  if (!modifiers.matchesPredicate) {
    return null;
  }
  /* the fuzzysort wraps the object with other properties, like a score */
  const gene = fuzzySortResult.obj;
  const text = gene.name;

  return (
    <MenuItem
      active={modifiers.active}
      disabled={modifiers.disabled}
      // Use of annotations in this way is incorrect and dataset specific.
      // See https://github.com/chanzuckerberg/cellxgene/issues/483
      // label={gene.n_counts}
      key={gene.name}
      onClick={g => {
        /* this fires when user clicks a menu item */
        handleClick(g);
      }}
      text={text}
    />
  );
};

const filterGenes = (query, genes) => {
  /* fires on load, once, and then for each character typed into the input */
  return fuzzysort.go(query, genes, {
    key: "name",
    limit: 5,
    threshold: -10000 // don't return bad results
  });
};

@connect(state => {
  const metadata = _.get(state.controls.world, "obsAnnotations", null);
  const ranges = _.get(state.controls.world, "summary.obs", null);
  const initializeRanges = _.get(state.controls.world, "summary.obs");

  return {
    ranges,
    metadata,
    initializeRanges,
    userDefinedGenes: state.controls.userDefinedGenes,
    userDefinedGenesLoading: state.controls.userDefinedGenesLoading,
    world: state.controls.world,
    colorAccessor: state.controls.colorAccessor,
    allGeneNames: state.controls.allGeneNames,
    differential: state.differential
  };
})
class GeneExpression extends React.Component {
  handleClick(g) {
    const { world, dispatch, userDefinedGenes } = this.props;
    const gene = g.target;
    if (userDefinedGenes.indexOf(gene) !== -1) {
      postUserErrorToast("That gene already exists");
    } else if (userDefinedGenes.length > 15) {
      postUserErrorToast(
        "That's too many genes, you can have at most 15 user defined genes"
      );
    } else if (!_.find(world.varAnnotations, { name: gene })) {
      postUserErrorToast("That doesn't appear to be a valid gene name.");
    } else {
      dispatch(actions.requestUserDefinedGene(gene));
      dispatch({
        type: "user defined gene",
        data: gene
      });
    }
  }

  render() {
    const {
      world,
      userDefinedGenes,
      userDefinedGenesLoading,
      differential
    } = this.props;

    return (
      <div>
        <div
          style={{
            marginTop: 30
          }}
        >
          <p
            style={Object.assign({}, globals.leftSidebarSectionHeading, {
              paddingLeft: globals.leftSidebarSectionPadding,
              margin: 0
            })}
          >
            Selected Genes
          </p>
          <div
            style={{ padding: globals.leftSidebarSectionPadding }}
            className="bp3-control-group"
          >
            <Suggest
              disabled={true}
              closeOnSelect
              openOnKeyDown
              resetOnSelect
              itemDisabled={userDefinedGenesLoading ? () => true : () => false}
              noResults={<MenuItem disabled text="No matching genes." />}
              onItemSelect={g => {
                /* this happens on 'enter' */
                this.handleClick(g);
              }}
              inputValueRenderer={g => {
                return "";
              }}
              itemListPredicate={filterGenes}
              itemRenderer={renderGene.bind(this)}
              items={
                world && world.varAnnotations
                  ? world.varAnnotations
                  : [{ name: "No genes", n_counts: "" }]
              }
              popoverProps={{ minimal: true }}
            />
            <Button
              className="bp3-button bp3-intent-primary"
              loading={userDefinedGenesLoading}
            >
              Add
            </Button>
          </div>
          {world && userDefinedGenes.length > 0
            ? _.map(userDefinedGenes, (geneName, index) => {
                const values = world.varDataCache[geneName];
                if (!values) {
                  return null;
                }
                return (
                  <HistogramBrush
                    key={geneName}
                    field={geneName}
                    zebra={index % 2 === 0}
                    ranges={d3.extent(values)}
                    isUserDefined
                  />
                );
              })
            : null}
        </div>
        <div>
          <p
            style={Object.assign({}, globals.leftSidebarSectionHeading, {
              marginTop: 40,
              paddingLeft: globals.leftSidebarSectionPadding
            })}
          >
            Differentially Expressed Genes
          </p>
          <ExpressionButtons />
          {differential.diffExp
            ? _.map(differential.diffExp, (value, index) => {
                const annotations = world.varAnnotations[value[0]];
                const { name } = annotations;
                const values = world.varDataCache[name];
                if (!values) {
                  return null;
                }
                return (
                  <HistogramBrush
                    key={name}
                    field={name}
                    zebra={index % 2 === 0}
                    ranges={d3.extent(values)}
                    isDiffExp
                    logFoldChange={value[1]}
                    pval={value[2]}
                    pvalAdj={value[3]}
                  />
                );
              })
            : null}
        </div>
      </div>
    );
  }
}

export default GeneExpression;