"use client"

import { getUserGroupTree } from "@/components/label/api/user"
import { Organization } from "@/components/label/api/user/typing"
import useAuth from "@/components/label/hooks/useAuth"
import { useAllUserStore } from "@/components/label/store/auth"
import {
  ActionIcon,
  Button,
  Group,
  Paper,
  ScrollArea,
  Stack,
  Text,
  TextInput,
} from "@mantine/core"
import { notifications } from "@mantine/notifications"
import {
  IconPlus,
  IconRefresh,
  IconSearch,
  IconUserCircle,
} from "@tabler/icons-react"
import { useCallback, useEffect, useMemo, useState } from "react"
import CreateModal from "./components/CreateModal"

type NodeItem = {
  key: string
  name: string
  isUser?: boolean
  isManager?: boolean
  children: NodeItem[]
}

function toNodeTree(data: Organization.Response[]): NodeItem[] {
  return (data ?? []).map((item) => {
    const children: NodeItem[] = []

    if (Array.isArray(item.children) && item.children.length > 0) {
      children.push(...toNodeTree(item.children))
    }

    if (item.leader_uid && item.leader_name) {
      children.push({
        key: `${item.group_uuid}/${item.leader_uid}`,
        name: item.leader_name,
        isUser: true,
        isManager: true,
        children: [],
      })
    }

    if (Array.isArray(item.members) && item.members.length > 0) {
      item.members.forEach((member) => {
        if (member.id === item.leader_uid) return
        children.push({
          key: `${item.group_uuid}/${member.id}`,
          name: member.name,
          isUser: true,
          children: [],
        })
      })
    }

    return {
      key: item.group_uuid,
      name: item.name,
      children,
    }
  })
}

function filterTree(nodes: NodeItem[], keyword: string): NodeItem[] {
  if (!keyword.trim()) return nodes
  const lower = keyword.trim().toLowerCase()
  return nodes
    .map((node) => {
      const matched = node.name.toLowerCase().includes(lower)
      const children = filterTree(node.children, keyword)
      if (!matched && children.length === 0) return null
      return { ...node, children }
    })
    .filter((n): n is NodeItem => !!n)
}

type FlatNode = NodeItem & { depth: number }

function flattenTree(nodes: NodeItem[], depth = 0): FlatNode[] {
  const list: FlatNode[] = []
  nodes.forEach((node) => {
    list.push({ ...node, depth })
    if (node.children.length > 0) {
      list.push(...flattenTree(node.children, depth + 1))
    }
  })
  return list
}

function HighlightText(props: { text: string; keyword: string }) {
  const { text, keyword } = props
  if (!keyword.trim()) return <>{text}</>
  const index = text.toLowerCase().indexOf(keyword.trim().toLowerCase())
  if (index < 0) return <>{text}</>

  const before = text.slice(0, index)
  const match = text.slice(index, index + keyword.length)
  const after = text.slice(index + keyword.length)
  return (
    <>
      {before}
      <Text component="span" c="blue" fw={700}>
        {match}
      </Text>
      {after}
    </>
  )
}

export default function TeamOrganizationPage() {
  const { isShow } = useAuth()
  const setFlag = useAllUserStore((s) => s.setFlag)

  const [open, setOpen] = useState(false)
  const [groupName, setGroupName] = useState("")
  const [data, setData] = useState<NodeItem[]>([])
  const [loading, setLoading] = useState(false)

  const load = useCallback(async () => {
    try {
      setLoading(true)
      const res = await getUserGroupTree()
      setData(toNodeTree(res ?? []))
    } catch (e) {
      setData([])
      notifications.show({
        color: "red",
        title: "加载失败",
        message: e instanceof Error ? e.message : "请求失败",
      })
    } finally {
      setLoading(false)
    }
  }, [])

  useEffect(() => {
    queueMicrotask(load)
  }, [load])

  const rows = useMemo(() => {
    const filtered = filterTree(data, groupName)
    return flattenTree(filtered)
  }, [data, groupName])

  return (
    <Stack w="100%" h="calc(100vh - 56px)" p="md" gap="md">
      <Paper
        withBorder
        p="md"
        radius="md"
        style={{
          borderColor:
            "light-dark(var(--mantine-color-gray-4), var(--mantine-color-dark-4))",
        }}>
        <Group justify="space-between" wrap="wrap">
          <Group>
            <TextInput
              placeholder="请输入用户组名称或用户名称进行搜索"
              size="xs"
              radius="xs"
              leftSection={<IconSearch size={14} />}
              value={groupName}
              onChange={(e) => setGroupName(e.currentTarget.value)}
              style={{ minWidth: 360 }}
            />
            <ActionIcon
              variant="default"
              size="md"
              onClick={load}
              loading={loading}>
              <IconRefresh size={16} />
            </ActionIcon>
          </Group>
          {isShow("group_add") ? (
            <Button
              size="xs"
              radius="xs"
              leftSection={<IconPlus size={16} />}
              onClick={() => setOpen(true)}>
              新增用户组
            </Button>
          ) : null}
        </Group>
      </Paper>

      <Paper
        withBorder
        p="md"
        radius="md"
        style={{
          borderColor:
            "light-dark(var(--mantine-color-gray-4), var(--mantine-color-dark-4))",
          flex: 1,
          minHeight: 0,
        }}>
        <ScrollArea h="100%" type="auto">
          <Stack gap={6}>
            {rows.map((node) => {
              return (
                <Paper
                  key={node.key}
                  withBorder
                  radius="sm"
                  p="xs"
                  style={{
                    marginLeft: node.depth * 18,
                    borderColor:
                      "light-dark(var(--mantine-color-gray-3), var(--mantine-color-dark-4))",
                    backgroundColor: node.isUser
                      ? "var(--mantine-color-gray-0)"
                      : "var(--mantine-color-blue-0)",
                  }}>
                  <Group gap={8}>
                    {node.isUser ? <IconUserCircle size={16} /> : null}
                    <Text size="sm">
                      <HighlightText text={node.name} keyword={groupName} />
                      {!node.isUser && node.children.length > 0
                        ? `（${node.children.length}）`
                        : ""}
                    </Text>
                    {node.isManager ? (
                      <Text
                        size="xs"
                        c="blue"
                        style={{
                          backgroundColor: "var(--mantine-color-blue-0)",
                          padding: "2px 6px",
                          borderRadius: 4,
                        }}>
                        负责人
                      </Text>
                    ) : null}
                  </Group>
                </Paper>
              )
            })}
            {rows.length === 0 ? (
              <Text c="dimmed" size="sm">
                暂无匹配数据
              </Text>
            ) : null}
          </Stack>
        </ScrollArea>
      </Paper>

      <CreateModal
        opened={open}
        onCloseAction={(refresh) => {
          setOpen(false)
          if (refresh) {
            setFlag(true)
            load()
          }
        }}
      />
    </Stack>
  )
}