import {
  VStack,
  Tag,
  Text,
  Tooltip,
  useColorModeValue,
  theme,
} from '@chakra-ui/react'
import { useGroupsCoordinates } from '../../providers'
import { useTypebot } from '@/features/editor'
import { useWorkspace } from '@/features/workspace'
import React, { useMemo } from 'react'
import { byId, isDefined } from '@typebot.io/lib'
import { isProPlan } from '@/features/billing'
import { AnswersCount } from '@/features/analytics'
import { computeSourceCoordinates, computeDropOffPath } from '../../utils'
import { useEndpoints } from '../../providers/EndpointsProvider'

type Props = {
  groupId: string
  answersCounts: AnswersCount[]
  onUnlockProPlanClick?: () => void
}

export const DropOffEdge = ({
  answersCounts,
  groupId,
  onUnlockProPlanClick,
}: Props) => {
  const dropOffColor = useColorModeValue(
    theme.colors.red[500],
    theme.colors.red[400]
  )
  const { workspace } = useWorkspace()
  const { groupsCoordinates } = useGroupsCoordinates()
  const { sourceEndpointYOffsets: sourceEndpoints } = useEndpoints()
  const { publishedTypebot } = useTypebot()

  const isWorkspaceProPlan = isProPlan(workspace)

  const totalAnswers = useMemo(
    () => answersCounts.find((a) => a.groupId === groupId)?.totalAnswers,
    [answersCounts, groupId]
  )

  const { totalDroppedUser, dropOffRate } = useMemo(() => {
    if (!publishedTypebot || totalAnswers === undefined)
      return { previousTotal: undefined, dropOffRate: undefined }
    const previousGroupIds = publishedTypebot.edges
      .map((edge) =>
        edge.to.groupId === groupId ? edge.from.groupId : undefined
      )
      .filter(isDefined)
    const previousTotal = answersCounts
      .filter((a) => previousGroupIds.includes(a.groupId))
      .reduce((prev, acc) => acc.totalAnswers + prev, 0)
    if (previousTotal === 0)
      return { previousTotal: undefined, dropOffRate: undefined }
    const totalDroppedUser = previousTotal - totalAnswers

    return {
      totalDroppedUser,
      dropOffRate: Math.round((totalDroppedUser / previousTotal) * 100),
    }
  }, [answersCounts, groupId, totalAnswers, publishedTypebot])

  const group = publishedTypebot?.groups.find(byId(groupId))

  const sourceTop = useMemo(() => {
    const endpointId = group?.blocks[group.blocks.length - 1].id
    return endpointId ? sourceEndpoints.get(endpointId)?.y : undefined
  }, [group?.blocks, sourceEndpoints])

  const labelCoordinates = useMemo(() => {
    if (!groupsCoordinates[groupId]) return
    return computeSourceCoordinates(groupsCoordinates[groupId], sourceTop ?? 0)
  }, [groupsCoordinates, groupId, sourceTop])

  if (!labelCoordinates) return <></>
  return (
    <>
      <path
        d={computeDropOffPath(
          { x: labelCoordinates.x - 300, y: labelCoordinates.y },
          sourceTop ?? 0
        )}
        stroke={dropOffColor}
        strokeWidth="2px"
        markerEnd="url(#red-arrow)"
        fill="none"
      />
      <foreignObject
        width="100"
        height="80"
        x={labelCoordinates.x - 30}
        y={labelCoordinates.y + 80}
      >
        <Tooltip
          label="Unlock Drop-off rate by upgrading to Pro plan"
          isDisabled={isWorkspaceProPlan}
        >
          <VStack
            bgColor={dropOffColor}
            color="white"
            rounded="md"
            p="2"
            justifyContent="center"
            w="full"
            h="full"
            onClick={isWorkspaceProPlan ? undefined : onUnlockProPlanClick}
            cursor={isWorkspaceProPlan ? 'auto' : 'pointer'}
          >
            <Text filter={isWorkspaceProPlan ? '' : 'blur(2px)'}>
              {isWorkspaceProPlan ? (
                dropOffRate
              ) : (
                <Text as="span" filter="blur(2px)">
                  X
                </Text>
              )}
              %
            </Text>
            <Tag colorScheme="red">
              {isWorkspaceProPlan ? (
                totalDroppedUser
              ) : (
                <Text as="span" filter="blur(3px)" mr="1">
                  NN
                </Text>
              )}{' '}
              users
            </Tag>
          </VStack>
        </Tooltip>
      </foreignObject>
    </>
  )
}