import React, { ComponentPropsWithoutRef, useEffect, useRef, useState } from 'react'
import { usePersistantState } from '../util/persistant-state'
const d3promise = import('d3-force-3d')

import type {
  ForceGraph2D as TForceGraph2D,
  ForceGraph3D as TForceGraph3D,
} from 'react-force-graph'
import { OrgRoamGraphReponse, OrgRoamLink, OrgRoamNode } from '../api'
import { GraphData, NodeObject } from 'force-graph'

import { useWindowSize } from '@react-hook/window-size'

import {
  Accordion,
  AccordionButton,
  AccordionItem,
  AccordionIcon,
  AccordionPanel,
  Text,
  Heading,
  VStack,
  StackDivider,
  Button,
  CloseButton,
  Slider,
  SliderThumb,
  SliderTrack,
  SliderFilledTrack,
  Switch,
  FormControl,
  FormLabel,
  Box,
  Container,
  Icon,
  IconButton,
  Tooltip,
  Menu,
  MenuList,
  MenuButton,
  MenuItem,
  MenuGroup,
  MenuDivider,
  MenuOptionGroup,
  MenuItemOption,
  Flex,
} from '@chakra-ui/react'

import { InfoOutlineIcon, RepeatClockIcon, ChevronDownIcon } from '@chakra-ui/icons'

// react-force-graph fails on import when server-rendered
// https://github.com/vasturiano/react-force-graph/issues/155
const ForceGraph2D = (
  !!global.window ? require('react-force-graph').ForceGraph2D : null
) as typeof TForceGraph2D

const ForceGraph3D = (
  !!global.window ? require('react-force-graph').ForceGraph3D : null
) as typeof TForceGraph3D

export type NodeById = { [nodeId: string]: OrgRoamNode | undefined }
export type LinksByNodeId = { [nodeId: string]: OrgRoamLink[] | undefined }
export type Scope = {
  nodeIds: string[]
}

const initialPhysics = {
  enabled: true,
  charge: -350,
  collision: true,
  collisionStrength: 0,
  linkStrength: 0.1,
  linkIts: 1,
  particles: false,
  particlesNumber: 0,
  particlesWidth: 4,
  linkOpacity: 0.4,
  linkWidth: 1,
  nodeRel: 4,
  labels: true,
  labelScale: 1.5,
  alphaDecay: 0.02,
  alphaTarget: 0,
  alphaMin: 0,
  velocityDecay: 0.25,
  gravity: 0.5,
  gravityOn: true,
  colorful: true,
  galaxy: true,
  ticks: 1,
  hover: 'highlight',
  click: 'select',
  doubleClick: 'local',
  iterations: 0,
  highlight: true,
  highlightNodeSize: 2,
  highlightLinkSize: 2,
}

const initialTheme = {
  base1: '#1c1f24',
  base2: '#21272d',
  base3: '#23272e',
  base4: '#484854',
  base5: '#62686E',
  base6: '#757B80',
  base7: '#9ca0a4',
  base8: '#DFDFDF',
  bg: '#242730',
  'bg-alt': '#2a2e38',
  blue: '#51afef',
  cyan: '#5cEfFF',
  'dark-blue': '#1f5582',
  'dark-cyan': '#6A8FBF',
  fg: '#bbc2cf',
  'fg-alt': '#5D656B',
  green: '#7bc275',
  grey: '#484854',
  magenta: '#C57BDB',
  orange: '#e69055',
  red: '#ff665c',
  teal: '#4db5bd',
  violet: '#a991f1',
  yellow: '#FCCE7B',
}

export default function Home() {
  // only render on the client
  const [showPage, setShowPage] = useState(false)
  useEffect(() => {
    setShowPage(true)
  }, [])

  if (!showPage) {
    return null
  }

  return <GraphPage />
}

export function GraphPage() {
  const [physics, setPhysics] = usePersistantState('physics', initialPhysics)
  const [theme, setTheme] = useState(initialTheme)
  const [graphData, setGraphData] = useState<GraphData | null>(null)
  const [emacsNodeId, setEmacsNodeId] = useState<string | null>(null)

  const nodeByIdRef = useRef<NodeById>({})
  const linksByNodeIdRef = useRef<LinksByNodeId>({})

  useEffect(() => {
    const trackEmacs = new EventSource('http://127.0.0.1:35901/current-node-id')

    trackEmacs.addEventListener('message', (e) => {
      const emacsNodeId = e.data
      setEmacsNodeId(emacsNodeId)
    })
    fetch('http://localhost:35901/theme')
      .then((res) => res.json())
      .then((emacsTheme) => {
        setTheme(emacsTheme)
      })
    fetch('http://localhost:35901/graph')
      .then((res) => res.json())
      .then((orgRoamGraphData: OrgRoamGraphReponse) => {
        nodeByIdRef.current = Object.fromEntries(
          orgRoamGraphData.nodes.map((node) => [node.id, node]),
        )
        linksByNodeIdRef.current = orgRoamGraphData.links.reduce<LinksByNodeId>((acc, link) => {
          return {
            ...acc,
            [link.source]: [...(acc[link.source] ?? []), link],
            [link.target]: [...(acc[link.target] ?? []), link],
          }
        }, {})

        // react-force-graph modifies the graph data implicitly,
        // so we make sure there's no overlap between the objects we pass it and
        // nodeByIdRef, linksByNodeIdRef
        const orgRoamGraphDataClone = JSON.parse(JSON.stringify(orgRoamGraphData))
        setGraphData(orgRoamGraphDataClone)
      })
  }, [])

  const [threeDim, setThreeDim] = useState(false)
  const [showTweeks, setShowTweeks] = useState(true)

  if (!graphData) {
    return null
  }

  return (
    <div>
      {showTweeks && (
        <Tweaks
          {...{
            physics,
            setPhysics,
            threeDim,
          }}
          onClose={() => {
            setShowTweeks(false)
          }}
        />
      )}
      <Graph
        nodeById={nodeByIdRef.current!}
        linksByNodeId={linksByNodeIdRef.current!}
        {...{
          physics,
          graphData,
          threeDim,
          emacsNodeId,
        }}
      />
    </div>
  )
}

export interface InfoTooltipProps {
  infoText?: string | boolean
}
export const InfoTooltip = (props: InfoTooltipProps) => {
  const { infoText } = props
  return (
    <Box paddingLeft="1">
      <Tooltip label={infoText} placement="top" color="gray.100" bg="gray.800" hasArrow>
        <InfoOutlineIcon />
      </Tooltip>
    </Box>
  )
}
export interface SliderWithInfoProps {
  min?: number
  max?: number
  step?: number
  value: number
  onChange: (arg0: number) => void
  label: string
  infoText?: string
}
export const SliderWithInfo = ({
  min = 0,
  max = 10,
  step = 0.1,
  value = 1,
  ...rest
}: SliderWithInfoProps) => {
  const { onChange, label, infoText } = rest
  return (
    <Box>
      <Box display="flex" alignItems="flex-end">
        <Text>{label}</Text>
        {infoText && <InfoTooltip infoText={infoText} />}
      </Box>
      <Slider value={value} onChange={onChange} min={min} max={max} step={step}>
        <SliderTrack>
          <SliderFilledTrack />
        </SliderTrack>
        <Tooltip label={value.toFixed(1)}>
          <SliderThumb />
        </Tooltip>
      </Slider>
    </Box>
  )
}

export interface EnableSectionProps {
  label: string
  value: boolean | number
  onChange: () => void
  infoText?: string
  children: React.ReactNode
}

export const EnableSection = (props: EnableSectionProps) => {
  const { value, onChange, label, infoText, children } = props
  return (
    <Box>
      <Box display="flex" justifyContent="space-between">
        <Box display="flex" alignItems="center">
          <Text>{label}</Text>
          {infoText && <InfoTooltip infoText={infoText} />}
        </Box>
        <Switch isChecked={!!value} onChange={onChange} />
      </Box>
      {value && children}
    </Box>
  )
}

export interface TweakProps {
  physics: typeof initialPhysics
  setPhysics: any
  threeDim: boolean
  onClose: () => void
}
export const Tweaks = function (props: TweakProps) {
  const { physics, setPhysics, threeDim, onClose } = props
  return (
    <Box
      zIndex="overlay"
      position="absolute"
      bg="white"
      w="xs"
      marginTop="2%"
      marginLeft="2%"
      borderRadius="md"
      maxH="80%"
      overflowY="scroll"
    >
      <Box display="flex" justifyContent="flex-end">
        <Tooltip label="Reset settings to defaults">
          <IconButton
            aria-label="Reset Defaults"
            icon={<RepeatClockIcon />}
            onClick={() => setPhysics(initialPhysics)}
          />
        </Tooltip>
        <CloseButton onClick={onClose} />
      </Box>
      <Accordion allowMultiple defaultIndex={[0]} allowToggle>
        <AccordionItem>
          <AccordionButton display="flex" justifyContent="space-between">
            <Box display="flex">
              <AccordionIcon />
              <Text>Physics</Text>
            </Box>
            <Switch
              id="physicsOn"
              onChange={() => setPhysics({ ...physics, enabled: !physics.enabled })}
              isChecked={physics.enabled}
            />
          </AccordionButton>
          <AccordionPanel>
            <VStack
              spacing={2}
              justifyContent="flex-start"
              divider={<StackDivider borderColor="gray.200" />}
              align="stretch"
            >
              <EnableSection
                label="Gravity"
                value={physics.gravityOn}
                onChange={() => setPhysics({ ...physics, gravityOn: !physics.gravityOn })}
              >
                <SliderWithInfo
                  label="Strength"
                  value={physics.gravity * 10}
                  onChange={(v) => setPhysics({ ...physics, gravity: v / 10 })}
                />
              </EnableSection>
              <SliderWithInfo
                value={-physics.charge / 100}
                onChange={(value) => setPhysics({ ...physics, charge: -100 * value })}
                label="Repulsive Force"
              />
              <EnableSection
                label="Collision"
                infoText="Perfomance sap, disable if slow"
                value={physics.collision}
                onChange={() => setPhysics({ ...physics, collision: !physics.collision })}
              >
                <SliderWithInfo
                  value={physics.collisionStrength * 10}
                  onChange={(value) => setPhysics({ ...physics, collisionStrength: value / 10 })}
                  label="Strength"
                />
              </EnableSection>
              <SliderWithInfo
                value={physics.linkStrength * 5}
                onChange={(value) => setPhysics({ ...physics, linkStrength: value / 5 })}
                label="Link Force"
              />
              <SliderWithInfo
                label="Link Iterations"
                value={physics.linkIts}
                onChange={(value) => setPhysics({ ...physics, linkIts: value })}
                min={0}
                max={6}
                step={1}
                infoText="How many links down the line the physics of a single node affects (Slow)"
              />
              <SliderWithInfo
                label="Viscosity"
                value={physics.velocityDecay * 10}
                onChange={(value) => setPhysics({ ...physics, velocityDecay: value / 10 })}
              />
            </VStack>
            <Box>
              <Accordion allowToggle>
                <AccordionItem>
                  <AccordionButton>
                    <Text>Advanced</Text>
                    <AccordionIcon />
                  </AccordionButton>
                  <AccordionPanel>
                    <VStack
                      spacing={2}
                      justifyContent="flex-start"
                      divider={<StackDivider borderColor="gray.200" />}
                      align="stretch"
                    >
                      <SliderWithInfo
                        label="Iterations per tick"
                        min={1}
                        max={10}
                        step={1}
                        value={physics.iterations}
                        onChange={(v) => setPhysics({ ...physics, iterations: v })}
                        infoText="Number of times the physics simulation iterates per simulation step"
                      />
                      <SliderWithInfo
                        label="Stabilization rate"
                        value={physics.alphaDecay * 50}
                        onChange={(value) => setPhysics({ ...physics, alphaDecay: value / 50 })}
                      />
                    </VStack>
                  </AccordionPanel>
                </AccordionItem>
              </Accordion>
            </Box>
            {/* </VStack> */}
          </AccordionPanel>
        </AccordionItem>
        <AccordionItem>
          <AccordionButton>
            <AccordionIcon />
            Visual
          </AccordionButton>
          <AccordionPanel>
            <VStack
              spacing={2}
              justifyContent="flex-start"
              divider={<StackDivider borderColor="gray.200" />}
              align="stretch"
            >
              <SliderWithInfo
                label="Node size"
                value={physics.nodeRel}
                onChange={(value) => setPhysics({ ...physics, nodeRel: value })}
              />
              <SliderWithInfo
                label="Link width"
                value={physics.linkWidth}
                onChange={(value) => setPhysics({ ...physics, linkWidth: value })}
              />
              <EnableSection
                label="Labels"
                value={physics.labels}
                onChange={() => setPhysics({ ...physics, labels: !physics.labels })}
              >
                <SliderWithInfo
                  label="Label Appearance Scale"
                  value={physics.labelScale * 5}
                  onChange={(value) => setPhysics({ ...physics, labelScale: value / 5 })}
                />
              </EnableSection>
              <EnableSection
                label="Directional Particles"
                value={physics.particles}
                onChange={() => setPhysics({ ...physics, particles: !physics.particles })}
              >
                <SliderWithInfo
                  label="Particle Number"
                  value={physics.particlesNumber}
                  max={5}
                  step={1}
                  onChange={(value) => setPhysics({ ...physics, particlesNumber: value })}
                />
                <SliderWithInfo
                  label="Particle Size"
                  value={physics.particlesWidth}
                  onChange={(value) => setPhysics({ ...physics, particleWidth: value })}
                />
              </EnableSection>
              <EnableSection
                label="Highlight"
                onChange={() => setPhysics({ ...physics, highlight: !physics.highlight })}
                value={physics.highlight}
              >
                <SliderWithInfo
                  label="Highlight Link Thickness Multiplier"
                  value={physics.highlightLinkSize}
                  onChange={(value) => setPhysics({ ...physics, highlightLinkSize: value })}
                />
                <SliderWithInfo
                  label="Highlight Node Size Multiplier"
                  value={physics.highlightNodeSize}
                  onChange={(value) => setPhysics({ ...physics, highlightNodeSize: value })}
                />
                <Flex justifyContent="space-between">
                  <Text></Text>
                </Flex>
              </EnableSection>
            </VStack>
          </AccordionPanel>
        </AccordionItem>
        <AccordionItem>
          <AccordionButton>
            <AccordionIcon />
            Behavior
          </AccordionButton>
          <AccordionPanel>
            <VStack
              spacing={2}
              justifyContent="flex-start"
              divider={<StackDivider borderColor="gray.200" />}
              align="stretch"
            >
              <Box display="flex" justifyContent="space-between" alignItems="center">
                <Text>Hover Higlight</Text>
                <Menu>
                  <MenuButton as={Button} rightIcon={<ChevronDownIcon />}>
                    {physics.hover}
                  </MenuButton>
                  <MenuList>
                    <MenuItem>Off</MenuItem>
                    <MenuItem>On</MenuItem>
                  </MenuList>
                </Menu>
              </Box>
              <Box display="flex" justifyContent="space-between">
                <Text>Click</Text>
              </Box>
              <Box display="flex" justifyContent="space-between">
                <Text>Double-click</Text>
              </Box>
            </VStack>
          </AccordionPanel>
        </AccordionItem>
      </Accordion>
    </Box>
  )
}

export interface GraphProps {
  nodeById: NodeById
  linksByNodeId: LinksByNodeId
  graphData: GraphData
  physics: typeof initialPhysics
  threeDim: boolean
  emacsNodeId: string | null
}

export const Graph = function (props: GraphProps) {
  const { physics, graphData, threeDim, linksByNodeId, emacsNodeId } = props

  const graph2dRef = useRef<any>(null)
  const graph3dRef = useRef<any>(null)

  // react-force-graph does not track window size
  // https://github.com/vasturiano/react-force-graph/issues/233
  // does not work below a certain width
  const [windowWidth, windowHeight] = useWindowSize()

  const [hoverNode, setHoverNode] = useState<NodeObject | null>(null)
  const [scope, setScope] = useState<Scope>({ nodeIds: [] })

  useEffect(() => {
    if (!emacsNodeId) {
      return
    }

    setScope({
      nodeIds: [emacsNodeId],
    })
  }, [emacsNodeId])

  const centralHighlightedNode = hoverNode
  const highlightedNodes = (() => {
    if (!centralHighlightedNode) {
      return {}
    }

    const links = linksByNodeId[centralHighlightedNode.id!]
    if (!links) {
      return {}
    }

    return Object.fromEntries(
      [
        centralHighlightedNode.id! as string,
        ...links.flatMap((link) => [link.source, link.target]),
      ].map((nodeId) => [nodeId, {}]),
    )
  })()

  const scopedNodes = graphData.nodes.filter((node) => {
    const links = linksByNodeId[node.id as string] ?? []
    return (
      scope.nodeIds.includes(node.id as string) ||
      links.some((link) => {
        return scope.nodeIds.includes(link.source) || scope.nodeIds.includes(link.target)
      })
    )
  })

  const scopedNodeIds = scopedNodes.map((node) => node.id as string)

  const scopedLinks = graphData.links.filter((link) => {
    // we need to cover both because force-graph modifies the original data
    // but if we supply the original data on each render, the graph will re-render sporadically
    const sourceId = typeof link.source === 'object' ? link.source.id! : (link.source as string)
    const targetId = typeof link.target === 'object' ? link.target.id! : (link.target as string)

    return scopedNodeIds.includes(sourceId as string) && scopedNodeIds.includes(targetId as string)
  })

  const scopedGraphData =
    scope.nodeIds.length === 0
      ? graphData
      : {
          nodes: scopedNodes,
          links: scopedLinks,
        }

  useEffect(() => {
    ;(async () => {
      const fg = threeDim ? graph3dRef.current : graph2dRef.current
      const d3 = await d3promise
      if (physics.gravityOn) {
        fg.d3Force('x', d3.forceX().strength(physics.gravity))
        fg.d3Force('y', d3.forceY().strength(physics.gravity))
        if (threeDim) {
          if (physics.galaxy) {
            fg.d3Force('x', d3.forceX().strength(physics.gravity / 5))
            fg.d3Force('z', d3.forceZ().strength(physics.gravity / 5))
          } else {
            fg.d3Force('x', d3.forceX().strength(physics.gravity))
            fg.d3Force('z', d3.forceZ().strength(physics.gravity))
          }
        } else {
          fg.d3Force('z', null)
        }
      } else {
        fg.d3Force('x', null)
        fg.d3Force('y', null)
        threeDim ? fg.d3Force('z', null) : null
      }
      fg.d3Force('link').strength(physics.linkStrength)
      fg.d3Force('link').iterations(physics.linkIts)
      physics.collision
        ? fg.d3Force('collide', d3.forceCollide().radius(20))
        : fg.d3Force('collide', null)
      fg.d3Force('charge').strength(physics.charge)
    })()
  })

  // Normally the graph doesn't update when you just change the physics parameters
  // This forces the graph to make a small update when you do
  useEffect(() => {
    graph2dRef.current?.d3ReheatSimulation()
  }, [physics])

  //shitty handler to check for doubleClicks
  const lastNodeClickRef = useRef(0)

  const onNodeClick = (node: NodeObject, event: any) => {
    const isDoubleClick = event.timeStamp - lastNodeClickRef.current < 400
    lastNodeClickRef.current = event.timeStamp

    if (isDoubleClick) {
      window.open('org-protocol://roam-node?node=' + node.id, '_self')
      return
    }

    setScope((currentScope) => ({
      ...currentScope,
      nodeIds: [...currentScope.nodeIds, node.id as string],
    }))
    return
  }

  const graphCommonProps: ComponentPropsWithoutRef<typeof TForceGraph2D> = {
    graphData: scopedGraphData,
    width: windowWidth,
    height: windowHeight,
    backgroundColor: '#242730',
    nodeLabel: (node) => (node as OrgRoamNode).title,
    nodeColor: (node) => {
      if (!physics.colorful) {
        if (Object.keys(highlightedNodes).length === 0) {
          return 'rgb(100, 100, 100)'
        }
        return highlightedNodes[node.id!] ? '#a991f1' : 'rgb(50, 50, 50)'
      }

      const palette = [
        '#ff665c',
        '#e69055',
        '#7bc275',
        '#4db5bd',
        '#FCCE7B',
        '#51afef',
        '#1f5582',
        '#C57BDB',
        '#a991f1',
        '#5cEfFF',
        '#6A8FBF',
      ]

      return palette[
        numbereWithinRange(linksByNodeId[node.id!]?.length ?? 0, 0, palette.length - 1)
      ]
    },
    nodeRelSize: physics.nodeRel,
    nodeVal: (node) => {
      const links = linksByNodeId[node.id!] ?? []
      const basicSize = 3 + links.length
      const highlightSize = highlightedNodes[node.id!] ? physics.highlightNodeSize : 1
      return basicSize * highlightSize
    },
    nodeCanvasObject: (node, ctx, globalScale) => {
      if (!physics.labels) {
        return
      }

      if (globalScale <= physics.labelScale && !highlightedNodes[node.id!]) {
        return
      }

      const nodeTitle = (node as OrgRoamNode).title
      const label = nodeTitle.substring(0, Math.min(nodeTitle.length, 30))
      // const label = 'label'
      const fontSize = 12 / globalScale
      const textWidth = ctx.measureText(label).width
      const bckgDimensions = [textWidth * 1.1, fontSize].map((n) => n + fontSize * 0.5) as [
        number,
        number,
      ] // some padding

      const fadeFactor = Math.min((3 * (globalScale - physics.labelScale)) / physics.labelScale, 1)

      const opacity =
        highlightedNodes.length === 0
          ? 0.5 * fadeFactor
          : highlightedNodes[node.id!]
          ? 0.5
          : 0.15 * fadeFactor

      // draw label background
      ctx.fillStyle = `rgba(20, 20, 20, ${opacity})`
      ctx.fillRect(
        node.x! - bckgDimensions[0] / 2,
        node.y! - bckgDimensions[1] / 2,
        ...bckgDimensions,
      )

      // draw label text
      ctx.textAlign = 'center'
      ctx.textBaseline = 'middle'
      ctx.fillStyle =
        'rgb(255, 255, 255, ' +
        (highlightedNodes.length === 0
          ? fadeFactor
          : highlightedNodes[node.id!]
          ? 1
          : 0.3 * fadeFactor) +
        ')'
      ctx.font = `${fontSize}px Sans-Serif`
      ctx.fillText(label, node.x!, node.y!)
    },
    nodeCanvasObjectMode: () => 'after',

    linkDirectionalParticles: physics.particles ? physics.particlesNumber : undefined,
    linkColor: (link) => {
      const linkIsHighlighted =
        (link.source as NodeObject).id! === centralHighlightedNode?.id! ||
        (link.target as NodeObject).id! === centralHighlightedNode?.id!

      return linkIsHighlighted ? '#a991f1' : '#666666'
    },
    linkWidth: () => {
      return physics.linkWidth
    },
    linkDirectionalParticleWidth: physics.particlesWidth,

    d3AlphaDecay: physics.alphaDecay,
    d3AlphaMin: physics.alphaMin,
    d3VelocityDecay: physics.velocityDecay,

    onNodeClick: onNodeClick,
    onBackgroundClick: () => {
      setScope((currentScope) => ({
        ...currentScope,
        nodeIds: [],
      }))
    },
    onNodeHover: (node) => {
      if (!physics.hover) {
        return
      }
      setHoverNode(node)
    },
  }

  return (
    <div>
      {threeDim ? (
        <ForceGraph3D ref={graph3dRef} {...graphCommonProps} nodeThreeObjectExtend={true} />
      ) : (
        <ForceGraph2D ref={graph2dRef} {...graphCommonProps} />
      )}
    </div>
  )
}

function numbereWithinRange(num: number, min: number, max: number) {
  return Math.min(Math.max(num, min), max)
}