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

import DataTable from '../../components/DataTable'
import EmptyState from '../../components/EmptyState'

import apiClient, { isEnvelope } from '../../api/client'
import type { AddressGroup, AddressObject, FwRule, FwService, FwZone, ServiceGroup, Zone } from './types'
import { ZONES_FALLBACK } from './types'

interface FormValues {
  name?: string
  priority: number
  enabled: boolean
  action: FwRule['action']
  src_zone: Zone
  src_kind: 'object' | 'group' | 'cidr' | 'any'
  src_address_object_id?: number
  src_address_group_id?: number
  src_cidr?: string
  dst_zone: Zone
  dst_kind: 'object' | 'group' | 'cidr' | 'any'
  dst_address_object_id?: number
  dst_address_group_id?: number
  dst_cidr?: string
  service_kind: 'object' | 'group' | 'any'
  service_object_id?: number
  service_group_id?: number
  log: boolean
  comment?: string
}

const ACTION_COLORS: Record<FwRule['action'], string> = {
  accept: 'green',
  drop:   'red',
  reject: 'orange',
}

async function listRules(): Promise<FwRule[]> {
  const r = await apiClient.get('/firewall/rules')
  if (!isEnvelope(r.data)) return []
  return (r.data.data as { rules?: FwRule[] }).rules ?? []
}
async function listAO(): Promise<AddressObject[]> {
  const r = await apiClient.get('/firewall/address-objects')
  if (!isEnvelope(r.data)) return []
  return (r.data.data as { address_objects?: AddressObject[] }).address_objects ?? []
}
async function listAG(): Promise<AddressGroup[]> {
  const r = await apiClient.get('/firewall/address-groups')
  if (!isEnvelope(r.data)) return []
  return (r.data.data as { address_groups?: AddressGroup[] }).address_groups ?? []
}
async function listSv(): Promise<FwService[]> {
  const r = await apiClient.get('/firewall/services')
  if (!isEnvelope(r.data)) return []
  return (r.data.data as { services?: FwService[] }).services ?? []
}
async function listSG(): Promise<ServiceGroup[]> {
  const r = await apiClient.get('/firewall/service-groups')
  if (!isEnvelope(r.data)) return []
  return (r.data.data as { service_groups?: ServiceGroup[] }).service_groups ?? []
}
async function listZones(): Promise<FwZone[]> {
  const r = await apiClient.get('/firewall/zones')
  if (!isEnvelope(r.data)) return []
  return (r.data.data as { zones?: FwZone[] }).zones ?? []
}

function buildPayload(v: FormValues) {
  const out: Partial<FwRule> = {
    name: v.name, priority: v.priority, enabled: v.enabled, action: v.action,
    src_zone: v.src_zone, dst_zone: v.dst_zone, log: v.log, comment: v.comment,
    src_address_object_id: null, src_address_group_id: null, src_cidr: null,
    dst_address_object_id: null, dst_address_group_id: null, dst_cidr: null,
    service_object_id: null, service_group_id: null,
  }
  if (v.src_kind === 'object') out.src_address_object_id = v.src_address_object_id ?? null
  if (v.src_kind === 'group')  out.src_address_group_id  = v.src_address_group_id  ?? null
  if (v.src_kind === 'cidr')   out.src_cidr              = v.src_cidr              ?? null
  if (v.dst_kind === 'object') out.dst_address_object_id = v.dst_address_object_id ?? null
  if (v.dst_kind === 'group')  out.dst_address_group_id  = v.dst_address_group_id  ?? null
  if (v.dst_kind === 'cidr')   out.dst_cidr              = v.dst_cidr              ?? null
  if (v.service_kind === 'object') out.service_object_id = v.service_object_id ?? null
  if (v.service_kind === 'group')  out.service_group_id  = v.service_group_id  ?? null
  return out
}

export default function RulesTab() {
  const { t } = useTranslation()
  const qc = useQueryClient()
  const { data: rules, isLoading } = useQuery({ queryKey: ['fw', 'rules'], queryFn: listRules })
  const { data: aos } = useQuery({ queryKey: ['fw', 'addr-obj'], queryFn: listAO })
  const { data: ags } = useQuery({ queryKey: ['fw', 'addr-grp'], queryFn: listAG })
  const { data: svs } = useQuery({ queryKey: ['fw', 'svc'], queryFn: listSv })
  const { data: sgs } = useQuery({ queryKey: ['fw', 'svc-grp'], queryFn: listSG })
  const { data: zones } = useQuery({ queryKey: ['fw', 'zones'], queryFn: listZones })

  // Picker options: 'any' (special) + every zone the operator has
  // declared. Fallback to the seed list while the query is loading.
  const zoneOptions: Zone[] = zones && zones.length > 0
    ? ['any', ...zones.map((z) => z.name)]
    : ZONES_FALLBACK

  const aoLabel = (id?: number | null) => aos?.find(o => o.id === id)?.name ?? `#${id}`
  const agLabel = (id?: number | null) => ags?.find(g => g.id === id)?.name ?? `#${id}`
  const svLabel = (id?: number | null) => svs?.find(s => s.id === id)?.name ?? `#${id}`
  const sgLabel = (id?: number | null) => sgs?.find(g => g.id === id)?.name ?? `#${id}`

  const renderSide = (objID?: number | null, grpID?: number | null, cidr?: string | null) => {
    if (objID) return <Tag>obj:{aoLabel(objID)}</Tag>
    if (grpID) return <Tag color="purple">grp:{agLabel(grpID)}</Tag>
    if (cidr)  return <code>{cidr}</code>
    return <Tag>any</Tag>
  }
  const renderService = (objID?: number | null, grpID?: number | null) => {
    if (objID) return <Tag>{svLabel(objID)}</Tag>
    if (grpID) return <Tag color="purple">grp:{sgLabel(grpID)}</Tag>
    return <Tag>any</Tag>
  }

  const [editing, setEditing] = useState<FwRule | null>(null)
  const [creating, setCreating] = useState(false)
  const [form] = Form.useForm<FormValues>()

  const create = useMutation({
    mutationFn: async (v: FormValues) => { await apiClient.post('/firewall/rules', buildPayload(v)) },
    onSuccess: () => {
      message.success(t('common.save')); setCreating(false); form.resetFields()
      void qc.invalidateQueries({ queryKey: ['fw', 'rules'] })
    },
  })
  const update = useMutation({
    mutationFn: async ({ id, v }: { id: number; v: FormValues }) => { await apiClient.put(`/firewall/rules/${id}`, buildPayload(v)) },
    onSuccess: () => {
      message.success(t('common.save')); setEditing(null); form.resetFields()
      void qc.invalidateQueries({ queryKey: ['fw', 'rules'] })
    },
  })
  const del = useMutation({
    mutationFn: async (id: number) => { await apiClient.delete(`/firewall/rules/${id}`) },
    onSuccess: () => { void qc.invalidateQueries({ queryKey: ['fw', 'rules'] }) },
  })

  const editFromRow = (r: FwRule) => {
    setEditing(r)
    form.setFieldsValue({
      name: r.name ?? undefined,
      priority: r.priority, enabled: r.enabled, action: r.action,
      src_zone: r.src_zone, dst_zone: r.dst_zone, log: r.log, comment: r.comment ?? undefined,
      src_kind: r.src_address_object_id ? 'object' : r.src_address_group_id ? 'group' : r.src_cidr ? 'cidr' : 'any',
      src_address_object_id: r.src_address_object_id ?? undefined,
      src_address_group_id: r.src_address_group_id ?? undefined,
      src_cidr: r.src_cidr ?? undefined,
      dst_kind: r.dst_address_object_id ? 'object' : r.dst_address_group_id ? 'group' : r.dst_cidr ? 'cidr' : 'any',
      dst_address_object_id: r.dst_address_object_id ?? undefined,
      dst_address_group_id: r.dst_address_group_id ?? undefined,
      dst_cidr: r.dst_cidr ?? undefined,
      service_kind: r.service_object_id ? 'object' : r.service_group_id ? 'group' : 'any',
      service_object_id: r.service_object_id ?? undefined,
      service_group_id: r.service_group_id ?? undefined,
    })
  }

  const columns: ColumnsType<FwRule> = [
    { title: '#', dataIndex: 'priority', key: 'priority', width: 70 },
    {
      title: t('fw.rule.action'), dataIndex: 'action', key: 'action',
      render: (a: FwRule['action']) => <Tag color={ACTION_COLORS[a]}>{a.toUpperCase()}</Tag>,
    },
    {
      title: t('fw.rule.src'), key: 'src',
      render: (_, r) => <Space size={4}><Tag>{r.src_zone}</Tag>{renderSide(r.src_address_object_id, r.src_address_group_id, r.src_cidr)}</Space>,
    },
    {
      title: t('fw.rule.dst'), key: 'dst',
      render: (_, r) => <Space size={4}><Tag>{r.dst_zone}</Tag>{renderSide(r.dst_address_object_id, r.dst_address_group_id, r.dst_cidr)}</Space>,
    },
    {
      title: t('fw.rule.service'), key: 'svc',
      render: (_, r) => renderService(r.service_object_id, r.service_group_id),
    },
    { title: t('fw.rule.enabled'), dataIndex: 'enabled', key: 'enabled', render: (v: boolean) => v ? '✓' : '—' },
    { title: t('fw.rule.name'), dataIndex: 'name', key: 'name', render: (v?: string) => v ?? '—' },
    {
      title: t('common.edit'), key: 'actions',
      render: (_, row) => (
        <Space>
          <Button size="small" onClick={() => editFromRow(row)}>{t('common.edit')}</Button>
          <Popconfirm title={t('fw.rule.deleteConfirm')} onConfirm={() => del.mutate(row.id)}>
            <Button size="small" danger>{t('common.delete')}</Button>
          </Popconfirm>
        </Space>
      ),
    },
  ]

  const openCreate = () => {
    setCreating(true); form.resetFields()
    form.setFieldsValue({
      priority: 100, enabled: true, action: 'accept', log: false,
      src_zone: 'any', dst_zone: 'any',
      src_kind: 'any', dst_kind: 'any', service_kind: 'any',
    })
  }

  return (
    <>
      <Button type="primary" className="mb-16" onClick={openCreate}>
        {t('fw.rule.add')}
      </Button>
      <DataTable
        rowKey="id"
        loading={isLoading}
        dataSource={rules ?? []}
        columns={columns}
        emptyContent={
          <EmptyState
            icon={<FireOutlined />}
            title={t('fw.rule.emptyTitle')}
            description={t('fw.rule.emptyDesc')}
            action={<Button type="primary" onClick={openCreate}>{t('fw.rule.add')}</Button>}
          />
        }
      />
      <Modal
        title={editing ? t('fw.rule.edit') : t('fw.rule.add')}
        open={editing !== null || creating}
        onCancel={() => { setEditing(null); setCreating(false) }}
        onOk={() => { void form.submit() }}
        confirmLoading={create.isPending || update.isPending}
        width={620}
      >
        <Form
          form={form}
          layout="vertical"
          onFinish={(v) => { if (editing) update.mutate({ id: editing.id, v }); else create.mutate(v) }}
        >
          <Form.Item label={t('fw.rule.name')} name="name">
            <Input placeholder="SSH von Office" />
          </Form.Item>

          <Space size="middle" className="flex-wrap">
            <Form.Item label={t('fw.rule.priority')} name="priority" rules={[{ required: true }]}>
              <InputNumber min={0} max={9999} />
            </Form.Item>
            <Form.Item label={t('fw.rule.action')} name="action" rules={[{ required: true }]}>
              <Select style={{ width: 140 }} options={(['accept','drop','reject'] as const).map(a => ({ value: a, label: a }))} />
            </Form.Item>
            <Form.Item label={t('fw.rule.enabled')} name="enabled" valuePropName="checked">
              <Switch />
            </Form.Item>
            <Form.Item label={t('fw.rule.log')} name="log" valuePropName="checked">
              <Switch />
            </Form.Item>
          </Space>

          {(['src', 'dst'] as const).map((side) => (
            <Space key={side} size="middle" style={{ display: 'flex', flexWrap: 'wrap', alignItems: 'flex-start' }}>
              <Form.Item label={t(`fw.rule.${side}Zone`)} name={`${side}_zone`} rules={[{ required: true }]}>
                <Select style={{ width: 140 }} options={zoneOptions.map(z => ({ value: z, label: z }))} />
              </Form.Item>
              <Form.Item label={t(`fw.rule.${side}Kind`)} name={`${side}_kind`} rules={[{ required: true }]}>
                <Select style={{ width: 120 }} options={(['any','object','group','cidr'] as const).map(k => ({ value: k, label: k }))} />
              </Form.Item>
              <Form.Item noStyle shouldUpdate={(p, c) => p[`${side}_kind`] !== c[`${side}_kind`]}>
                {({ getFieldValue }) => {
                  const k = getFieldValue(`${side}_kind`)
                  if (k === 'object') {
                    return <Form.Item label={t('fw.rule.object')} name={`${side}_address_object_id`} rules={[{ required: true }]}>
                      <Select style={{ width: 220 }} showSearch optionFilterProp="label"
                              options={(aos ?? []).map(o => ({ value: o.id, label: `${o.name} (${o.kind}: ${o.value})` }))} />
                    </Form.Item>
                  }
                  if (k === 'group') {
                    return <Form.Item label={t('fw.rule.group')} name={`${side}_address_group_id`} rules={[{ required: true }]}>
                      <Select style={{ width: 220 }} showSearch optionFilterProp="label"
                              options={(ags ?? []).map(g => ({ value: g.id, label: g.name }))} />
                    </Form.Item>
                  }
                  if (k === 'cidr') {
                    return <Form.Item label="CIDR" name={`${side}_cidr`} rules={[{ required: true }]}>
                      <Input placeholder="10.0.0.0/24" style={{ width: 200 }} />
                    </Form.Item>
                  }
                  return null
                }}
              </Form.Item>
            </Space>
          ))}

          <Space size="middle" className="flex-wrap">
            <Form.Item label={t('fw.rule.serviceKind')} name="service_kind" rules={[{ required: true }]}>
              <Select style={{ width: 120 }} options={(['any','object','group'] as const).map(k => ({ value: k, label: k }))} />
            </Form.Item>
            <Form.Item noStyle shouldUpdate={(p, c) => p.service_kind !== c.service_kind}>
              {({ getFieldValue }) => {
                const k = getFieldValue('service_kind')
                if (k === 'object') {
                  return <Form.Item label={t('fw.rule.service')} name="service_object_id" rules={[{ required: true }]}>
                    <Select style={{ width: 240 }} showSearch optionFilterProp="label"
                            options={(svs ?? []).map(s => ({
                              value: s.id,
                              label: `${s.name} (${s.proto}${s.port_start ? ' '+s.port_start : ''})`,
                            }))} />
                  </Form.Item>
                }
                if (k === 'group') {
                  return <Form.Item label={t('fw.rule.serviceGroup')} name="service_group_id" rules={[{ required: true }]}>
                    <Select style={{ width: 240 }} showSearch optionFilterProp="label"
                            options={(sgs ?? []).map(g => ({ value: g.id, label: g.name }))} />
                  </Form.Item>
                }
                return null
              }}
            </Form.Item>
          </Space>

          <Form.Item label={t('fw.rule.comment')} name="comment">
            <Input />
          </Form.Item>
        </Form>
      </Modal>
    </>
  )
}