import React from 'react';
//import Highcharts from 'highcharts';
const ReactHighcharts = require('react-highcharts/dist/ReactHighstock');
import tt from 'counterpart';
import {
    LIQUID_TOKEN_UPPERCASE,
    DEBT_TOKEN_SHORT,
    LIQUID_TICKER,
    CURRENCY_SIGN,
} from 'app/client_config';

//Highstock does not play well with decimal x values, so we need to
// multiply the x values by a constant factor and divide by this factor for
// display purposes (tooltip, x-axis)
const power = 100;
const precision = 1000;

function orderEqual(a, b) {
    return a.price === b.price && a.steem === b.steem && a.sbd === b.sbd;
}

function ordersEqual(a, b) {
    if (a.length !== b.length) {
        return false;
    }

    for (let key in a) {
        if (!(key in b) || !orderEqual(a[key], b[key])) {
            return false;
        }
    }

    for (let key in b) {
        if (!(key in a) || !orderEqual(a[key], b[key])) {
            return false;
        }
    }

    return true;
}

class DepthChart extends React.Component {
    static propTypes = {
        bids: React.PropTypes.array,
        asks: React.PropTypes.array,
    };

    shouldComponentUpdate(nextProps) {
        // Don't update if the orders are the same as last time
        if (
            ordersEqual(nextProps.bids, this.props.bids) &&
            ordersEqual(nextProps.asks, this.props.asks)
        ) {
            return false;
        }

        // Use HighCharts api once the chart has been initialized
        if (this.refs.depthChart) {
            // Only use the HighCharts api when both bids and asks already exist
            const chart = this.refs.depthChart.getChart();
            if (chart && 'series' in chart && chart.series.length === 2) {
                const { bids, asks } = generateBidAsk(
                    nextProps.bids,
                    nextProps.asks
                );
                const { min, max } = getMinMax(bids, asks);

                chart.series[0].setData(bids);
                chart.series[1].setData(asks);
                chart.xAxis[0].setExtremes(min, max);
                return false;
            }
        }
        return true;
    }

    render() {
        const { bids, asks } = this.props;
        if (!bids.length && !asks.length) {
            return null;
        }
        const depth_chart_config = generateDepthChart(bids, asks);
        return (
            <div className="DepthChart">
                <ReactHighcharts ref="depthChart" config={depth_chart_config} />
            </div>
        );
    }
}

export default DepthChart;

function generateBidAsk(bidsArray, asksArray) {
    // Input raw orders (from TOP of order book DOWN), output grouped depth
    function aggregateOrders(orders) {
        if (typeof orders == 'undefined') {
            return [];
        }

        let ttl = 0;
        return orders
            .map(o => {
                ttl += o.sbd;
                return [o.price * power, ttl];
            })
            .sort((a, b) => {
                // Sort here to make sure arrays are in the right direction for HighCharts
                return a[0] - b[0];
            });
    }

    let bids = aggregateOrders(bidsArray);
    // Insert a 0 entry to make sure the chart is centered properly
    bids.unshift([0, bids[0][1]]);

    let asks = aggregateOrders(asksArray);
    // Insert a final entry to make sure the chart is centered properly
    asks.push([asks[asks.length - 1][0] * 4, asks[asks.length - 1][1]]);

    return { bids, asks };
}

function getMinMax(bids, asks) {
    const highestBid = bids.length ? bids[bids.length - 1][0] : 0;
    const lowestAsk = asks.length ? asks[0][0] : 1;

    const middle = (highestBid + lowestAsk) / 2;

    return {
        min: Math.max(middle * 0.65, bids[0][0]),
        max: Math.min(middle * 1.35, asks[asks.length - 1][0]),
    };
}

function generateDepthChart(bidsArray, asksArray) {
    const { bids, asks } = generateBidAsk(bidsArray, asksArray);
    let series = [];

    const { min, max } = getMinMax(bids, asks);

    if (process.env.BROWSER) {
        if (bids[0]) {
            series.push({
                step: 'right',
                name: tt('g.bid'),
                color: 'rgba(0,150,0,1.0)',
                fillColor: 'rgba(0,150,0,0.2)',
                tooltip: { valueSuffix: ' ' + LIQUID_TICKER },
                data: bids,
            });
        }
        if (asks[0]) {
            series.push({
                step: 'left',
                name: tt('g.ask'),
                color: 'rgba(150,0,0,1.0)',
                fillColor: 'rgba(150,0,0,0.2)',
                tooltip: { valueSuffix: ' ' + LIQUID_TICKER },
                data: asks,
            });
        }
    }

    let depth_chart_config = {
        title: { text: null },
        subtitle: { text: null },
        chart: { type: 'area', zoomType: 'x' },
        xAxis: {
            min: min,
            max: max,
            labels: {
                formatter: function() {
                    return this.value / power;
                },
            },
            ordinal: false,
            lineColor: '#000000',
            title: {
                text: null,
            },
        },
        yAxis: {
            title: { text: null },
            lineWidth: 2,
            labels: {
                align: 'left',
                formatter: function() {
                    const value = this.value / precision;
                    return (
                        '$' +
                        (value > 1e6
                            ? (value / 1e6).toFixed(3) + 'M'
                            : value > 10000
                              ? (value / 1e3).toFixed(0) + 'k'
                              : value)
                    );
                },
            },
            gridLineWidth: 1,
        },
        legend: { enabled: false },
        credits: {
            enabled: false,
        },
        rangeSelector: {
            enabled: false,
        },
        navigator: {
            enabled: false,
        },
        scrollbar: {
            enabled: false,
        },
        dataGrouping: {
            enabled: false,
        },
        tooltip: {
            shared: false,
            backgroundColor: 'rgba(0, 0, 0, 0.3)',
            formatter() {
                return (
                    `<span>${tt('g.price')}: ${(this.x / power).toFixed(6)} ${
                        CURRENCY_SIGN
                    }/${LIQUID_TOKEN_UPPERCASE}</span><br/><span>\u25CF</span>${
                        this.series.name
                    }: <b>${(this.y / 1000).toFixed(3)} ${DEBT_TOKEN_SHORT} ` +
                    '(' +
                    CURRENCY_SIGN +
                    ')</b>'
                );
            },
            style: {
                color: '#FFFFFF',
            },
        },
        plotOptions: { series: { animation: false } },
        series,
    };
    //------------------------------
    return depth_chart_config;
}
