import { useState } from 'react'
import {
  Button, Card, Form, Input, InputNumber, Modal, Popconfirm, Space, Switch, Table, Tag, Tooltip, Typography, message,
} from 'antd'
import type { ColumnsType } from 'antd/es/table'
import {
  EnvironmentOutlined, PlusOutlined, ReloadOutlined,
} from '@ant-design/icons'
import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query'
import { useTranslation } from 'react-i18next'

import apiClient, { isEnvelope } from '../../api/client'
import { useAuthStore } from '../../stores/auth'
import EmptyState from '../../components/EmptyState'

const { Text } = Typography

interface ManagedRoute {
  id: number
  destination: string
  gateway?: string | null
  dev?: string | null
  metric: number
  table_name: string
  active: boolean
  comment?: string | null
}

interface LiveRoute {
  destination: string
  gateway?: string
  dev?: string
  protocol?: string
  scope?: string
  src?: string
  metric?: number
  table?: string
  flags?: string[]
}

interface RouteFormValues {
  destination: string
  gateway?: string
  dev?: string
  metric: number
  table_name: string
  active: boolean
  comment?: string
}

export default function RoutesTab() {
  const { t } = useTranslation()
  const qc = useQueryClient()
  const isViewer = useAuthStore((s) => s.user?.role) === 'viewer'

  const managed = useQuery({
    queryKey: ['routes', 'managed'],
    queryFn: async () => {
      const r = await apiClient.get('/routes')
      return isEnvelope(r.data) ? (r.data.data as { routes: ManagedRoute[] }).routes : []
    },
  })

  const live = useQuery({
    queryKey: ['routes', 'live'],
    queryFn: async () => {
      const r = await apiClient.get('/routes/live')
      return isEnvelope(r.data) ? (r.data.data as { routes: LiveRoute[] }).routes : []
    },
    refetchInterval: 30_000,
  })

  const [edit, setEdit] = useState<ManagedRoute | null>(null)
  const [creating, setCreating] = useState(false)
  const [form] = Form.useForm<RouteFormValues>()

  const create = useMutation({
    mutationFn: async (v: RouteFormValues) => { await apiClient.post('/routes', v) },
    onSuccess: () => {
      message.success(t('common.save'))
      setCreating(false); form.resetFields()
      qc.invalidateQueries({ queryKey: ['routes'] })
    },
    onError: (e: Error) => message.error(e.message),
  })

  const update = useMutation({
    mutationFn: async ({ id, v }: { id: number; v: RouteFormValues }) => {
      await apiClient.put(`/routes/${id}`, v)
    },
    onSuccess: () => {
      message.success(t('common.save'))
      setEdit(null); form.resetFields()
      qc.invalidateQueries({ queryKey: ['routes'] })
    },
    onError: (e: Error) => message.error(e.message),
  })

  const del = useMutation({
    mutationFn: async (id: number) => { await apiClient.delete(`/routes/${id}`) },
    onSuccess: () => { qc.invalidateQueries({ queryKey: ['routes'] }) },
    onError: (e: Error) => message.error(e.message),
  })
  const quickToggle = useMutation({
    mutationFn: async ({ id, row, checked }: { id: number; row: ManagedRoute; checked: boolean }) => {
      const { id: _id, ...body } = row
      await apiClient.put(`/routes/${id}`, { ...body, active: checked })
    },
    onSuccess: () => { qc.invalidateQueries({ queryKey: ['routes'] }) },
    onError: (e: Error) => message.error(e.message),
  })

  const managedColumns: ColumnsType<ManagedRoute> = [
    {
      title: t('routes.col.destination'), dataIndex: 'destination',
      render: (v: string) => <Text style={{ fontFamily: 'monospace' }}>{v}</Text>,
    },
    {
      title: t('routes.col.gateway'), dataIndex: 'gateway',
      render: (v?: string) => v
        ? <Text style={{ fontFamily: 'monospace' }}>{v}</Text>
        : <Text type="secondary">on-link</Text>,
    },
    { title: t('routes.col.dev'), dataIndex: 'dev', width: 110,
      render: (v?: string) => v ? <Tag>{v}</Tag> : '—' },
    { title: t('routes.col.metric'), dataIndex: 'metric', width: 80 },
    { title: t('routes.col.table'), dataIndex: 'table_name', width: 90 },
    {
      title: t('routes.col.active'), dataIndex: 'active', width: 80,
      render: (v: boolean, row: ManagedRoute) => (
        <Switch
          size="small"
          checked={v}
          disabled={isViewer}
          loading={quickToggle.isPending && quickToggle.variables?.id === row.id}
          onChange={(checked) => quickToggle.mutate({ id: row.id, row, checked })}
        />
      ),
    },
    { title: t('routes.col.comment'), dataIndex: 'comment',
      render: (v?: string) => v || <Text type="secondary">—</Text> },
    {
      title: t('common.actions'), key: 'a', width: 160,
      render: (_, r) => (
        <Space size={4}>
          <Tooltip title={isViewer ? t('auth.viewerBadge') : undefined}>
            <Button size="small" disabled={isViewer} onClick={() => {
              setEdit(r)
              form.setFieldsValue({
                destination: r.destination,
                gateway: r.gateway ?? undefined,
                dev: r.dev ?? undefined,
                metric: r.metric,
                table_name: r.table_name,
                active: r.active,
                comment: r.comment ?? undefined,
              })
            }}>{t('common.edit')}</Button>
          </Tooltip>
          {isViewer
            ? <Tooltip title={t('auth.viewerBadge')}><Button size="small" danger disabled>{t('common.delete')}</Button></Tooltip>
            : <Popconfirm title={t('routes.confirmDelete', { dest: r.destination })} onConfirm={() => del.mutate(r.id)}>
                <Button size="small" danger>{t('common.delete')}</Button>
              </Popconfirm>}
        </Space>
      ),
    },
  ]

  const liveColumns: ColumnsType<LiveRoute> = [
    { title: t('routes.col.destination'), dataIndex: 'destination',
      render: (v?: string) => (
        <Text style={{ fontFamily: 'monospace' }}>{v || 'default'}</Text>
      ) },
    { title: t('routes.col.gateway'), dataIndex: 'gateway',
      render: (v?: string) => v
        ? <Text style={{ fontFamily: 'monospace' }}>{v}</Text>
        : <Text type="secondary">—</Text> },
    { title: t('routes.col.dev'), dataIndex: 'dev', width: 110,
      render: (v?: string) => v ? <Tag>{v}</Tag> : '—' },
    { title: t('routes.col.proto'), dataIndex: 'protocol', width: 110,
      render: (v?: string) => v
        ? <Tag color={v === 'edgeguard' ? 'cyan' : 'default'}>{v}</Tag>
        : '—' },
    { title: t('routes.col.scope'), dataIndex: 'scope', width: 90,
      render: (v?: string) => v ? <Tag>{v}</Tag> : '—' },
    { title: t('routes.col.src'), dataIndex: 'src', width: 130,
      render: (v?: string) => v
        ? <Text style={{ fontFamily: 'monospace', fontSize: 11 }}>{v}</Text>
        : <Text type="secondary">—</Text> },
    { title: t('routes.col.metric'), dataIndex: 'metric', width: 80,
      render: (v?: number) => v ?? '—' },
  ]

  const openCreate = () => {
    setCreating(true); form.resetFields()
    form.setFieldsValue({
      metric: 100, table_name: 'main', active: true,
      destination: '', gateway: '', dev: '',
    })
  }

  return (
    <div>
      <Card
        size="small"
        title={
          <Space>
            <EnvironmentOutlined />
            {t('routes.liveTitle')}
            <Text type="secondary" style={{ fontSize: 12 }}>
              ({(live.data ?? []).length})
            </Text>
          </Space>
        }
        extra={
          <Tooltip title={t('routes.refreshTooltip')}>
            <Button size="small" icon={<ReloadOutlined />}
              loading={live.isFetching}
              onClick={() => live.refetch()}>{t('common.refresh')}</Button>
          </Tooltip>
        }
        className="mb-16"
      >
        <Text type="secondary">{t('routes.liveIntro')}</Text>
        <Table
          rowKey={(r, idx) => `${r.destination}-${r.dev}-${r.metric}-${idx}`}
          size="small"
          dataSource={live.data ?? []}
          columns={liveColumns}
          pagination={{ defaultPageSize: 25, showSizeChanger: true, pageSizeOptions: [25, 50, 100] }}
          locale={{ emptyText: t('routes.liveEmpty') }}
          style={{ marginTop: 12 }}
        />
      </Card>

      <Card
        size="small"
        title={t('routes.managedTitle')}
        extra={
          <Tooltip title={isViewer ? t('auth.viewerBadge') : undefined}>
            <Button type="primary" size="small" icon={<PlusOutlined />}
              disabled={isViewer} onClick={openCreate}>
              {t('routes.add')}
            </Button>
          </Tooltip>
        }
      >
        <Text type="secondary">{t('routes.managedIntro')}</Text>
        <Table
          rowKey="id"
          size="small"
          loading={managed.isFetching}
          dataSource={managed.data ?? []}
          columns={managedColumns}
          pagination={false}
          locale={{ emptyText: (
            <EmptyState
              icon={<EnvironmentOutlined />}
              title={t('routes.emptyTitle')}
              description={t('routes.emptyDesc')}
              action={
                <Tooltip title={isViewer ? t('auth.viewerBadge') : undefined}>
                  <Button type="primary" icon={<PlusOutlined />} disabled={isViewer} onClick={openCreate}>
                    {t('routes.add')}
                  </Button>
                </Tooltip>
              }
            />
          ) }}
          style={{ marginTop: 12 }}
        />
      </Card>

      <Modal
        title={edit ? t('routes.editTitle') : t('routes.addTitle')}
        open={edit !== null || creating}
        onCancel={() => { setEdit(null); setCreating(false); form.resetFields() }}
        onOk={() => form.submit()}
        confirmLoading={create.isPending || update.isPending}
        width={560}
      >
        <Form form={form} layout="vertical"
          onFinish={(v) => edit ? update.mutate({ id: edit.id, v }) : create.mutate(v)}>
          <Form.Item label={t('routes.col.destination')} name="destination"
            rules={[{ required: true }]} extra={t('routes.destExtra')}>
            <Input placeholder="10.0.5.0/24" />
          </Form.Item>
          <Form.Item label={t('routes.col.gateway')} name="gateway"
            extra={t('routes.gatewayExtra')}>
            <Input placeholder="192.168.1.1" />
          </Form.Item>
          <Form.Item label={t('routes.col.dev')} name="dev"
            extra={t('routes.devExtra')}>
            <Input placeholder="ens18" />
          </Form.Item>
          <Form.Item label={t('routes.col.metric')} name="metric"
            extra={t('routes.metricExtra')}>
            <InputNumber min={0} max={65535} style={{ width: '100%' }} />
          </Form.Item>
          <Form.Item label={t('routes.col.table')} name="table_name"
            extra={t('routes.tableExtra')}>
            <Input placeholder="main" />
          </Form.Item>
          <Form.Item label={t('routes.col.comment')} name="comment">
            <Input.TextArea rows={2} />
          </Form.Item>
          <Form.Item label={t('routes.col.active')} name="active" valuePropName="checked">
            <Switch />
          </Form.Item>
        </Form>
      </Modal>
    </div>
  )
}