import React, {useState} from 'react';
import {Sankey, ResponsiveContainer} from 'recharts';
import CustomLink from './CustomLink';
import CustomNode from './CustomNode';
import {NoContent, Icon} from 'UI';

interface Node {
    idd: string;
    name: string;
    eventType: string;
    avgTimeFromPrevious: number | null;
}

interface Link {
    id: string;
    eventType: string;
    value: number;
    source: string;
    target: string;
}

interface Data {
    nodes: Node[];
    links: Link[];
}

interface Props {
    data: Data;
    nodeWidth?: number;
    height?: number;
    onChartClick?: (filters: any[]) => void;
}

const SankeyChart: React.FC<Props> = ({data, height = 240, onChartClick}: Props) => {
    const [highlightedLinks, setHighlightedLinks] = useState<string[]>([]);
    const [hoveredLinks, setHoveredLinks] = useState<string[]>([]);

    function findPreviousLinks(targetNodeIndex: number): Link[] {
        const previousLinks: Link[] = [];
        const visitedNodes: Set<number> = new Set();

        const findPreviousLinksRecursive = (nodeIndex: number) => {
            visitedNodes.add(nodeIndex);

            for (const link of data.links) {
                if (link.target === nodeIndex && !visitedNodes.has(link.source)) {
                    previousLinks.push(link);
                    findPreviousLinksRecursive(link.source);
                }
            }
        };

        findPreviousLinksRecursive(targetNodeIndex);

        return previousLinks;
    }

    const handleLinkMouseEnter = (linkData: any) => {
        const {payload} = linkData;
        const link: any = data.links.find(link => link.id === payload.id);
        const previousLinks: any = findPreviousLinks(link.source).reverse();
        previousLinks.push({id: payload.id});
        setHoveredLinks(previousLinks.map((link: any) => link.id));
    };

    const clickHandler = () => {
        setHighlightedLinks(hoveredLinks);

        const firstLink = data.links.find(link => link.id === hoveredLinks[0]) || null;
        const lastLink = data.links.find(link => link.id === hoveredLinks[hoveredLinks.length - 1]) || null;

        const firstNode = data.nodes[firstLink?.source];
        const lastNode = data.nodes[lastLink?.target];

        const filters = [];

        if (firstNode) {
            filters.push({
                operator: 'is',
                type: firstNode.eventType,
                value: [firstNode.name],
                isEvent: true
            });
        }

        if (lastNode) {
            filters.push({
                operator: 'is',
                type: lastNode.eventType,
                value: [lastNode.name],
                isEvent: true
            });
        }

        onChartClick?.(filters);
    };

    // const processedData = processData(data);

    return (
        <NoContent
            style={{paddingTop: '80px'}}
            show={!data.nodes.length || !data.links.length}
            title={
                <div className="flex items-center text-lg">
                    <Icon name="info-circle" className="mr-2" size="18" />
                    No data available for the selected period.
                </div>
            }
        >
            <ResponsiveContainer height={height} width='100%'>
                <Sankey
                    data={data}
                    node={<CustomNode/>}
                    nodePadding={20}
                    sort={true}
                    nodeWidth={4}
                    iterations={128}
                    // linkCurvature={0.9}
                    onClick={clickHandler}
                    link={({source, target, id, ...linkProps}, index) => (
                        <CustomLink
                            {...linkProps}
                            hoveredLinks={hoveredLinks}
                            activeLinks={highlightedLinks}
                            strokeOpacity={highlightedLinks.includes(id) ? 0.8 : 0.2}
                            onMouseEnter={() => handleLinkMouseEnter(linkProps)}
                            onMouseLeave={() => setHoveredLinks([])}
                        />
                    )}
                    margin={{right: 130, bottom: 50}}
                >
                    <defs>
                        <linearGradient id={'linkGradient'}>
                            <stop offset='0%' stopColor='rgba(57, 78, 255, 0.2)'/>
                            <stop offset='100%' stopColor='rgba(57, 78, 255, 0.2)'/>
                        </linearGradient>
                    </defs>
                </Sankey>
            </ResponsiveContainer>
        </NoContent>
    );
};

export default SankeyChart;