import React, { useMemo } from 'react';
import { Group } from '@vx/group';
import { LinkHorizontal } from '@vx/shape';
import styled from 'styled-components';

import { useEntityRegistry } from '../useEntityRegistry';
import { IconStyleType } from '../entity/Entity';
import { NodeData, Direction, VizNode, EntitySelectParams } from './types';
import { ANTD_GRAY } from '../entity/shared/constants';
import { capitalizeFirstLetter } from '../shared/capitalizeFirstLetter';

const CLICK_DELAY_THRESHOLD = 1000;
const DRAG_DISTANCE_THRESHOLD = 20;

function truncate(input, length) {
    if (!input) return '';
    if (input.length > length) {
        return `${input.substring(0, length)}...`;
    }
    return input;
}

function getLastTokenOfTitle(title?: string): string {
    if (!title) return '';

    const lastToken = title?.split('.').slice(-1)[0];

    // if the last token does not contain any content, the string should not be tokenized on `.`
    if (lastToken.replace(/\s/g, '').length === 0) {
        return title;
    }

    return lastToken;
}

export const width = 212;
export const height = 80;
const iconWidth = 32;
const iconHeight = 32;
const iconX = -width / 2 + 22;
const iconY = -iconHeight / 2;
const centerX = -width / 2;
const centerY = -height / 2;
const textX = iconX + iconWidth + 8;

const PointerGroup = styled(Group)`
    cursor: pointer;
`;

const UnselectableText = styled.text`
    user-select: none;
`;

export default function LineageEntityNode({
    node,
    isSelected,
    isHovered,
    onEntityClick,
    onEntityCenter,
    onHover,
    onDrag,
    onExpandClick,
    direction,
    isCenterNode,
    nodesToRenderByUrn,
}: {
    node: { x: number; y: number; data: Omit<NodeData, 'children'> };
    isSelected: boolean;
    isHovered: boolean;
    isCenterNode: boolean;
    onEntityClick: (EntitySelectParams) => void;
    onEntityCenter: (EntitySelectParams) => void;
    onHover: (EntitySelectParams) => void;
    onDrag: (params: EntitySelectParams, event: React.MouseEvent) => void;
    onExpandClick: (LineageExpandParams) => void;
    direction: Direction;
    nodesToRenderByUrn: Record<string, VizNode>;
}) {
    const entityRegistry = useEntityRegistry();
    const unexploredHiddenChildren =
        node?.data?.countercurrentChildrenUrns?.filter((urn) => !(urn in nodesToRenderByUrn))?.length || 0;

    // we need to track lastMouseDownCoordinates to differentiate between clicks and drags. It doesn't use useState because
    // it shouldn't trigger re-renders
    const lastMouseDownCoordinates = useMemo(
        () => ({
            ts: 0,
            x: 0,
            y: 0,
        }),
        [],
    );

    return (
        <PointerGroup data-testid={`node-${node.data.urn}-${direction}`} top={node.x} left={node.y}>
            {unexploredHiddenChildren && (isHovered || isSelected) ? (
                <Group>
                    {[...Array(unexploredHiddenChildren)].map((_, index) => {
                        const link = {
                            source: {
                                x: 0,
                                y: direction === Direction.Upstream ? 70 : -70,
                            },
                            target: {
                                x: (0.5 / (index + 1)) * 80 * (index % 2 === 0 ? 1 : -1),
                                y: direction === Direction.Upstream ? 150 : -150,
                            },
                        };
                        return (
                            <LinkHorizontal
                                // eslint-disable-next-line  react/no-array-index-key
                                key={`link-${index}-${direction}`}
                                data={link}
                                stroke={`url(#gradient-${direction})`}
                                strokeWidth="1"
                                fill="none"
                            />
                        );
                    })}
                </Group>
            ) : null}
            {node.data.unexploredChildren ? (
                <Group
                    onClick={() => {
                        onExpandClick({ urn: node.data.urn, type: node.data.type, direction });
                    }}
                >
                    <circle
                        fill="white"
                        cy={centerY + height / 2}
                        cx={direction === Direction.Upstream ? centerX - 10 : centerX + width + 10}
                        r="20"
                    />
                    <g
                        fill={ANTD_GRAY[6]}
                        transform={`translate(${
                            direction === Direction.Upstream ? centerX - 52 : width / 2 + 10
                        } -21.5) scale(0.04 0.04)`}
                    >
                        <path d="M512 64C264.6 64 64 264.6 64 512s200.6 448 448 448 448-200.6 448-448S759.4 64 512 64zm192 472c0 4.4-3.6 8-8 8H544v152c0 4.4-3.6 8-8 8h-48c-4.4 0-8-3.6-8-8V544H328c-4.4 0-8-3.6-8-8v-48c0-4.4 3.6-8 8-8h152V328c0-4.4 3.6-8 8-8h48c4.4 0 8 3.6 8 8v152h152c4.4 0 8 3.6 8 8v48z" />
                    </g>
                </Group>
            ) : null}
            <Group
                onDoubleClick={() => onEntityCenter({ urn: node.data.urn, type: node.data.type })}
                onClick={(event) => {
                    if (
                        event.timeStamp < lastMouseDownCoordinates.ts + CLICK_DELAY_THRESHOLD &&
                        Math.sqrt(
                            (event.clientX - lastMouseDownCoordinates.x) ** 2 +
                                (event.clientY - lastMouseDownCoordinates.y) ** 2,
                        ) < DRAG_DISTANCE_THRESHOLD
                    ) {
                        onEntityClick({ urn: node.data.urn, type: node.data.type });
                    }
                }}
                onMouseOver={() => {
                    onHover({ urn: node.data.urn, type: node.data.type });
                }}
                onMouseOut={() => {
                    onHover(undefined);
                }}
                onMouseDown={(event) => {
                    lastMouseDownCoordinates.ts = event.timeStamp;
                    lastMouseDownCoordinates.x = event.clientX;
                    lastMouseDownCoordinates.y = event.clientY;
                    if (node.data.urn && node.data.type) {
                        onDrag({ urn: node.data.urn, type: node.data.type }, event);
                    }
                }}
            >
                <rect
                    height={height}
                    width={width}
                    y={centerY}
                    x={centerX}
                    fill="white"
                    stroke={
                        // eslint-disable-next-line no-nested-ternary
                        isSelected ? '#1890FF' : isHovered ? '#1890FF' : 'rgba(192, 190, 190, 0.25)'
                    }
                    strokeWidth={isCenterNode ? 2 : 1}
                    strokeOpacity={1}
                    rx={5}
                    // eslint-disable-next-line react/style-prop-object
                    style={{ filter: isSelected ? 'url(#shadow1-selected)' : 'url(#shadow1)' }}
                />
                {node.data.icon ? (
                    <image href={node.data.icon} height={iconHeight} width={iconWidth} x={iconX} y={iconY} />
                ) : (
                    node.data.type && (
                        <svg
                            viewBox="64 64 896 896"
                            focusable="false"
                            x={iconX}
                            y={iconY}
                            height={iconHeight}
                            width={iconWidth}
                            fill="currentColor"
                            aria-hidden="true"
                        >
                            {entityRegistry.getIcon(node.data.type, 16, IconStyleType.SVG)}
                        </svg>
                    )
                )}
                <Group>
                    <UnselectableText
                        dy="-1em"
                        x={textX}
                        fontSize={8}
                        fontFamily="Manrope"
                        fontWeight="bold"
                        textAnchor="start"
                        fill="#8C8C8C"
                    >
                        <tspan>{truncate(capitalizeFirstLetter(node.data.platform), 16)}</tspan>
                        <tspan dx=".25em" dy="2px" fill="#dadada" fontSize={12} fontWeight="normal">
                            {' '}
                            |{' '}
                        </tspan>
                        <tspan dx=".25em" dy="-2px">
                            {capitalizeFirstLetter(node.data.subtype || node.data.type)}
                        </tspan>
                    </UnselectableText>
                    <UnselectableText
                        dy="1em"
                        x={textX}
                        fontSize={14}
                        fontFamily="Manrope"
                        textAnchor="start"
                        fill={isCenterNode ? '#1890FF' : 'black'}
                    >
                        {truncate(getLastTokenOfTitle(node.data.name), 16)}
                    </UnselectableText>
                </Group>
                {unexploredHiddenChildren && isHovered ? (
                    <UnselectableText
                        dy=".33em"
                        dx={textX}
                        fontSize={16}
                        fontFamily="Arial"
                        textAnchor="middle"
                        fill="black"
                        y={centerY - 20}
                    >
                        {unexploredHiddenChildren} hidden {direction === Direction.Upstream ? 'downstream' : 'upstream'}{' '}
                        {unexploredHiddenChildren > 1 ? 'dependencies' : 'dependency'}
                    </UnselectableText>
                ) : null}
            </Group>
        </PointerGroup>
    );
}