import React from 'react';
import IDUtil from '../../util/IDUtil';
import ComponentUtil from '../../util/ComponentUtil';
import {LineChart, Line, CartesianGrid, XAxis, YAxis, Tooltip, Label, ResponsiveContainer, BarChart, Legend, Bar} from 'recharts';
import TimeUtil from '../../util/TimeUtil';
import SearchAPI from '../../api/SearchAPI';
import PropTypes from 'prop-types';
import Loading from '../../components/shared/Loading';
import Query from '../../model/Query';

//TODO move same functions as in Histogram into something else
export default class TermQuerySingleLineChart extends React.Component {

    constructor(props) {
        super(props);
        this.state = {
            viewMode: 'absolute', // Sets default view mode to absolute.
            relativeData : null, //loaded for the first time after switching to 'relative'
            isLoading: false
        }
    }

    switchViewMode = () => {
        if (this.state.viewMode === 'absolute') {
            if (this.state.relativeData === null) {
                this.fetchRelativeData({
                    ...this.props.query,
                    term: '',
                    selectedFacets: {},
                    dateRange: {
                        ...this.props.query.dateRange,
                        end: null,
                        start: null
                    }
                });
            } else {
                // there is already relative Data available to draw graph.
                this.setState({viewMode: 'relative', isLoading: false})
            }
        } else {
            this.setState({viewMode: 'absolute', isLoading: false})
        }
    };

    fetchRelativeData = query => {
        this.setState({
            isLoading : true
        }, () => {
            SearchAPI.search(query, this.props.collectionConfig, this.onRelativeDataFetched, false);
        });
    };

    onRelativeDataFetched = resultsObj => { //instance of SearchResults
        if (resultsObj && resultsObj.aggregations && !resultsObj.error) {
            const totalTermCounts = resultsObj.aggregations[this.props.selectedKeywordField];
            const commonData = totalTermCounts.filter(aggr => {
                return this.props.data.find(absAggr => absAggr.key === aggr.key) != null;
            });
            this.setState({relativeData: commonData, viewMode: 'relative', isLoading: false});
        }
    };

    calcRelativePercentage = (absCount, totalCount) => {
        if  (totalCount != 0){
        console.log("counts");
        console.log(absCount);
        console.log(totalCount);
        console.log((absCount / totalCount) * 100);
        }

        return absCount !== 0 && totalCount !== 0 ? ((absCount / totalCount) * 100) : 0;
    };

    filterByCurrentTerm= e => {
        // run only if there is a key
        if(e.payload && e.payload.key) {
            this.props.onClick(e.payload.key);
        }
    };

    //TODO better ID!! (include some unique part based on the query)
    render() {
        const strokeColors = ['#8884d8', 'green'];
        let dataPrettyfied = null;
        if(this.props.data) {
            if(this.state.viewMode === 'absolute') {
                dataPrettyfied = this.props.data.slice(0,this.props.termLimit).map((absData, i) => {
                    const point = {};
                    point["dataType"] = 'absolute';
                    point["strokeColor"] = strokeColors[0];
                    point["key"] = absData.key;
                    point["count"] = absData ? absData.doc_count : 0;
                    return point;
                });
            } else if(this.state.relativeData) {
                dataPrettyfied = this.props.data.slice(0,this.props.termLimit).map((absData, i) => {
                    const relData = this.state.relativeData.find(x => x.key === absData.key);
                    const point = {};
                    point["dataType"] = 'relative';
                    point["strokeColor"] = strokeColors[0]; //this.calcDateInRange(absData) ? strokeColors[0] : strokeColors[1];
                    point["key"] = absData.key;
                    point["count"] = relData ? this.calcRelativePercentage(absData.doc_count, relData.doc_count) : 0; //FIXME this should never happen, but still...
                    return point;
                });
            } else {
                console.error('this should never happen')
            }
        }

        if(dataPrettyfied) {
            const loadingMsg = this.state.isLoading ? <Loading message="Loading graph..."/> : null ;
            let legendTitle = 'Line chart of ' + this.props.title + ' for query results ';
            return (
                <div className={IDUtil.cssClassName('query-line-chart')}>
                    {loadingMsg}
                    <span className="ms_toggle_btn" >
                        <input id="term-toggle-1" className="checkbox-toggle checkbox-toggle-round" type="checkbox" onClick={this.switchViewMode}/>
                        <label htmlFor="term-toggle-1" data-on="Relative" data-off="Absolute"/>
                    </span>
                    <ResponsiveContainer width="100%" minHeight="440px" height="40%">
                        <LineChart  key={this.state.viewMode}  width={830} height={250} data={dataPrettyfied} margin={{left: 10, bottom: 5, right: 100}}>
                            <Legend verticalAlign="top" height={36}/>
                            <CartesianGrid strokeDasharray="1 6"/>
                            <XAxis dataKey="key" interval={0} height={180} tickFormatter={ComponentUtil.formatLabel} tickMargin={10} tick={{ angle: 45}} minTickGap={0} textAnchor="start">
                                <Label value={this.props.title} offset={-20} position="bottom"
                                       style={{fontSize: 1.4 + 'rem', fontWeight:'bold'}}/>
                            </XAxis>
                            <YAxis tickFormatter={ComponentUtil.formatNumber} width={100} >
                                <Label value={this.state.viewMode === 'absolute' ? "Number of records" : "Percentage of records"} offset={10} position="insideBottomLeft" angle={-90}
                                       style={{fontSize: 1.4 + 'rem', fontWeight:'bold', height: 460 + 'px', width: 100 + 'px' }}/>
                            </YAxis>
                            <Tooltip content={<CustomTooltip/>}/>
                            <Line isAnimationActive={true} dataKey="count"
                                  stroke={dataPrettyfied[0].strokeColor} activeDot={{ onClick: (event, payload) => this.filterByCurrentTerm(payload), r: 10 }} name={legendTitle}/>
                        </LineChart>
                    </ResponsiveContainer>
                </div>
            )
        } else {
            return (
                <div className={IDUtil.cssClassName('query-line-chart')}>
                    Loading data...
                </div>
            )
        }
    }
}


TermQuerySingleLineChart.propTypes = {
    title : PropTypes.string,
    query : Query.getPropTypes(true),
    data : PropTypes.arrayOf(PropTypes.shape({ // represents a termaggregation (from ES)
        key: PropTypes.string, //e.g "nieuws"
        doc_count: PropTypes.number, //e.g. 32
    })),
    selectedKeywordField: PropTypes.string,
  collectionConfig : PropTypes.object.isRequired
}

// Custom tooltip.
// TODO: Make it a separated component more customizable.
class CustomTooltip extends React.Component{
    render() {
        const {active} = this.props;
        if (active) {
            const {payload, label} = this.props,
                relativeValue = payload[0].value ? parseFloat(payload[0].value.toFixed(2)) : 0,
                dataType = payload[0].payload.dataType;
            if (dataType === 'relative') {
                return (
                    <div className="ms__custom-tooltip">
                        <h4>{dataType} value</h4>
                        <p>Term: <span className="rightAlign">{`${label}`}</span></p>
                        <p>Percentage: <span className="rightAlign">{ComponentUtil.formatNumber(relativeValue)}%</span></p>
                    </div>
                );
            } else {
                return (
                    <div className="ms__custom-tooltip">
                        <h4>{dataType} value</h4>
                        <p>Term: <span className="rightAlign">{`${label}`}</span> </p>
                        <p>Total: <span className="rightAlign">{ComponentUtil.formatNumber(payload[0].value)}</span></p>
                    </div>
                );
            }

        }

        return null;
    }
}
CustomTooltip.propTypes = {
    dataType: PropTypes.string,
    payload: PropTypes.array,
    label: PropTypes.string
};