import { CopyIcon, TrashIcon } from '@/components/icons'
import { headerHeight } from '@/features/editor/constants'
import { useTypebot } from '@/features/editor/providers/TypebotProvider'
import { useKeyboardShortcuts } from '@/hooks/useKeyboardShortcuts'
import {
  HStack,
  Button,
  IconButton,
  useColorModeValue,
  useEventListener,
} from '@chakra-ui/react'
import { useRef, useState } from 'react'
import { useGroupsStore } from '../hooks/useGroupsStore'
import { toast } from 'sonner'
import { createId } from '@paralleldrive/cuid2'
import { Edge, GroupV6, Variable } from '@typebot.io/schemas'
import { Coordinates } from '../types'
import { useShallow } from 'zustand/react/shallow'
import { projectMouse } from '../helpers/projectMouse'
import {
  extractVariableIdReferencesInObject,
  extractVariableIdsFromObject,
} from '@typebot.io/variables/extractVariablesFromObject'

type Props = {
  graphPosition: Coordinates & { scale: number }
  isReadOnly: boolean
  focusedGroups: string[]
  blurGroups: () => void
}

export const GroupSelectionMenu = ({
  graphPosition,
  isReadOnly,
  focusedGroups,
  blurGroups,
}: Props) => {
  const [mousePosition, setMousePosition] = useState<Coordinates>()
  const { typebot, deleteGroups, pasteGroups } = useTypebot()
  const ref = useRef<HTMLDivElement>(null)

  const groupsInClipboard = useGroupsStore(
    useShallow((state) => state.groupsInClipboard)
  )
  const { copyGroups, setFocusedGroups, updateGroupCoordinates } =
    useGroupsStore(
      useShallow((state) => ({
        copyGroups: state.copyGroups,
        updateGroupCoordinates: state.updateGroupCoordinates,
        setFocusedGroups: state.setFocusedGroups,
      }))
    )

  useEventListener('pointerup', (e) => e.stopPropagation(), ref.current)

  useEventListener('mousemove', (e) => {
    setMousePosition({
      x: e.clientX,
      y: e.clientY,
    })
  })

  const handleCopy = () => {
    if (!typebot) return
    const groups = typebot.groups.filter((g) => focusedGroups.includes(g.id))
    const edges = typebot.edges.filter((edge) =>
      groups.find((g) => g.id === edge.to.groupId)
    )
    const variables = extractVariablesFromCopiedGroups(
      groups,
      typebot.variables
    )
    copyGroups({
      groups,
      edges,
      variables,
    })
    return {
      groups,
      edges,
      variables,
    }
  }

  const handleDelete = () => {
    deleteGroups(focusedGroups)
    blurGroups()
  }

  const handlePaste = (overrideClipBoard?: {
    groups: GroupV6[]
    edges: Edge[]
    variables: Omit<Variable, 'value'>[]
  }) => {
    if (!groupsInClipboard || isReadOnly || !mousePosition) return
    const clipboard = overrideClipBoard ?? groupsInClipboard
    const { groups, oldToNewIdsMapping } = parseGroupsToPaste(
      clipboard.groups,
      projectMouse(mousePosition, graphPosition)
    )
    groups.forEach((group) => {
      updateGroupCoordinates(group.id, group.graphCoordinates)
    })
    pasteGroups(
      groups,
      clipboard.edges,
      clipboard.variables,
      oldToNewIdsMapping
    )
    setFocusedGroups(groups.map((g) => g.id))
  }

  useKeyboardShortcuts({
    copy: () => {
      handleCopy()
      toast('Groups copied to clipboard')
    },
    cut: () => {
      handleCopy()
      handleDelete()
    },
    duplicate: () => {
      const clipboard = handleCopy()
      handlePaste(clipboard)
    },
    backspace: handleDelete,
    paste: handlePaste,
  })

  return (
    <HStack
      ref={ref}
      rounded="md"
      spacing={0}
      pos="fixed"
      top={`calc(${headerHeight}px + 20px)`}
      bgColor={useColorModeValue('white', 'gray.900')}
      zIndex={1}
      right="100px"
      shadow="lg"
    >
      <Button
        pointerEvents={'none'}
        color={useColorModeValue('blue.500', 'blue.200')}
        borderRightWidth="1px"
        borderRightRadius="none"
        bgColor={useColorModeValue('white', undefined)}
        size="sm"
      >
        {focusedGroups.length} selected
      </Button>
      <IconButton
        borderRightWidth="1px"
        borderRightRadius="none"
        borderLeftRadius="none"
        aria-label="Copy"
        onClick={() => {
          handleCopy()
          toast('Groups copied to clipboard')
        }}
        bgColor={useColorModeValue('white', undefined)}
        icon={<CopyIcon />}
        size="sm"
      />

      <IconButton
        aria-label="Delete"
        borderLeftRadius="none"
        bgColor={useColorModeValue('white', undefined)}
        icon={<TrashIcon />}
        size="sm"
        onClick={handleDelete}
      />
    </HStack>
  )
}

const parseGroupsToPaste = (
  groups: GroupV6[],
  mousePosition: Coordinates
): { groups: GroupV6[]; oldToNewIdsMapping: Map<string, string> } => {
  const farLeftGroup = groups.sort(
    (a, b) => a.graphCoordinates.x - b.graphCoordinates.x
  )[0]
  const farLeftGroupCoord = farLeftGroup.graphCoordinates

  const oldToNewIdsMapping = new Map<string, string>()
  const newGroups = groups.map((group) => {
    const newId = createId()
    oldToNewIdsMapping.set(group.id, newId)

    return {
      ...group,
      id: newId,
      graphCoordinates:
        group.id === farLeftGroup.id
          ? mousePosition
          : {
              x:
                mousePosition.x +
                group.graphCoordinates.x -
                farLeftGroupCoord.x,
              y:
                mousePosition.y +
                group.graphCoordinates.y -
                farLeftGroupCoord.y,
            },
    }
  })

  return {
    groups: newGroups,
    oldToNewIdsMapping,
  }
}

export const extractVariablesFromCopiedGroups = (
  groups: GroupV6[],
  existingVariables: Variable[]
): Omit<Variable, 'value'>[] => {
  const groupsStr = JSON.stringify(groups)
  if (!groupsStr) return []
  const calledVariablesId = extractVariableIdReferencesInObject(
    groups,
    existingVariables
  )
  const variableIdsInOptions = extractVariableIdsFromObject(groups)

  return [...variableIdsInOptions, ...calledVariablesId].reduce<
    Omit<Variable, 'value'>[]
  >((acc, id) => {
    if (!id) return acc
    if (acc.find((v) => v.id === id)) return acc
    const variable = existingVariables.find((v) => v.id === id)
    if (!variable) return acc
    return [
      ...acc,
      {
        id: variable.id,
        name: variable.name,
        isSessionVariable: variable.isSessionVariable,
      },
    ]
  }, [])
}