import { useEffect, useState } from 'react'
import { toast } from 'sonner'

import { Button } from '@evobgp/ui/components/button'
import { Checkbox } from '@evobgp/ui/components/checkbox'
import { Field, FieldDescription, FieldLabel } from '@evobgp/ui/components/field'
import { Input } from '@evobgp/ui/components/input'

import { FormDrawer } from '@/components/form-drawer'
import { LoadingButton } from '@/components/loading-button'
import { CommunitySelect } from '@/components/modules/community-select'
import { SelectField } from '@/components/select-field'
import { dohProfileShortLabel } from '@/lib/modules/helpers'
import { dohPolicyRu, moduleTypeRu } from '@/lib/ui-labels'
import { useCreateModuleMutation } from '@/queries/modules'
import type {
  BgpCommunity,
  DohProfile,
  DohResolverPolicy,
  ModuleCreate,
  ModuleRow,
  ModuleType,
} from '@/types/api'

interface ModuleCreateDialogProps {
  open: boolean
  onOpenChange: (open: boolean) => void
  communities: BgpCommunity[]
  dohProfiles: DohProfile[]
  onCreated?: (mod: ModuleRow) => void
}

/** @see https://reui.io/preview/base/form-7 */
/** @see https://reui.io/preview/base/sheet-8 */

const MODULE_TYPE_ITEMS: { value: ModuleType; label: string }[] = [
  { value: 'IP_RANGES', label: moduleTypeRu('IP_RANGES') },
  { value: 'AS_PREFIXES', label: moduleTypeRu('AS_PREFIXES') },
  { value: 'CDN_CIDRS', label: moduleTypeRu('CDN_CIDRS') },
  { value: 'DOMAINS', label: moduleTypeRu('DOMAINS') },
]

const DOH_POLICY_ITEMS: { value: DohResolverPolicy; label: string }[] = [
  { value: 'primary_only', label: dohPolicyRu('primary_only') },
  { value: 'failover', label: dohPolicyRu('failover') },
  { value: 'union', label: dohPolicyRu('union') },
]

export function ModuleCreateDialog({
  open,
  onOpenChange,
  communities,
  dohProfiles,
  onCreated,
}: ModuleCreateDialogProps) {
  const createMutation = useCreateModuleMutation()

  const [type, setType] = useState<ModuleType>('IP_RANGES')
  const [name, setName] = useState('')
  const [enabled, setEnabled] = useState(true)
  const [priority, setPriority] = useState('0')
  const [refreshIntervalSec, setRefreshIntervalSec] = useState('')
  const [cronExpr, setCronExpr] = useState('')
  const [defaultCommunityId, setDefaultCommunityId] = useState<string | null>(null)
  const [dohResolverPolicy, setDohResolverPolicy] = useState<DohResolverPolicy>('primary_only')
  const [dohProfileIds, setDohProfileIds] = useState<string[]>([])

  const isDomains = type === 'DOMAINS'

  useEffect(() => {
    if (!open) return
    setType('IP_RANGES')
    setName('')
    setEnabled(true)
    setPriority('0')
    setRefreshIntervalSec('')
    setCronExpr('')
    setDefaultCommunityId(null)
    setDohResolverPolicy('primary_only')
    setDohProfileIds([])
  }, [open])

  function toggleDohProfile(id: string, checked: boolean) {
    setDohProfileIds((prev) => {
      if (checked) {
        if (prev.includes(id)) return prev
        return [...prev, id]
      }
      return prev.filter((x) => x !== id)
    })
  }

  async function save() {
    const trimmedName = name.trim()
    if (!trimmedName) {
      toast.error('Укажите название модуля')
      return
    }

    const priorityNum = Number(priority)
    if (!Number.isFinite(priorityNum) || !Number.isInteger(priorityNum)) {
      toast.error('Приоритет должен быть целым числом')
      return
    }

    let refresh: number | undefined
    if (refreshIntervalSec.trim() !== '') {
      const n = Number(refreshIntervalSec)
      if (!Number.isFinite(n) || !Number.isInteger(n) || n < 0) {
        toast.error('Интервал обновления должен быть целым числом ≥ 0')
        return
      }
      refresh = n
    }

    const body: ModuleCreate = {
      type,
      name: trimmedName,
      enabled,
      priority: priorityNum,
    }
    if (refresh !== undefined) {
      body.refresh_interval_sec = refresh
    }
    const cron = cronExpr.trim()
    if (cron) {
      body.cron_expr = cron
    }
    if (defaultCommunityId) {
      body.default_community_id = defaultCommunityId
    }
    if (isDomains) {
      body.doh_resolver_policy = dohResolverPolicy
      body.doh_profile_ids = dohProfileIds
    }

    try {
      const created = await createMutation.mutateAsync(body)
      onOpenChange(false)
      onCreated?.(created)
    } catch {
      // toast in mutation
    }
  }

  return (
    <FormDrawer
      open={open}
      onOpenChange={onOpenChange}
      title="Новый модуль"
      description="Тип задаётся один раз. Записи добавляются на карточке модуля."
      className="sm:max-w-md"
      footer={
        <>
          <Button variant="outline" type="button" onClick={() => onOpenChange(false)}>
            Отмена
          </Button>
          <LoadingButton type="button" loading={createMutation.isPending} onClick={() => void save()}>
            Создать
          </LoadingButton>
        </>
      }
    >
      <SelectField
        id="mod-create-type"
        label="Тип"
        items={MODULE_TYPE_ITEMS}
        value={type}
        onValueChange={(v) => {
          if (v) setType(v)
        }}
      />

      <Field>
        <FieldLabel htmlFor="mod-create-name">Название</FieldLabel>
        <Input
          id="mod-create-name"
          value={name}
          onChange={(e) => setName(e.target.value)}
          placeholder="Имя модуля"
        />
      </Field>

      <Field orientation="horizontal">
        <div className="grid min-w-0 flex-1 gap-1 pr-2">
          <FieldLabel htmlFor="mod-create-enabled">Включён</FieldLabel>
          <FieldDescription>
            Выключенный модуль не участвует в обновлении и применении.
          </FieldDescription>
        </div>
        <Checkbox
          id="mod-create-enabled"
          checked={enabled}
          onCheckedChange={(v) => setEnabled(v === true)}
        />
      </Field>

      <Field>
        <FieldLabel htmlFor="mod-create-priority">Приоритет</FieldLabel>
        <Input
          id="mod-create-priority"
          type="number"
          value={priority}
          onChange={(e) => setPriority(e.target.value)}
        />
      </Field>

      <Field>
        <FieldLabel htmlFor="mod-create-interval">Интервал обновления (сек)</FieldLabel>
        <Input
          id="mod-create-interval"
          type="number"
          min={0}
          placeholder="пусто = по умолчанию"
          value={refreshIntervalSec}
          onChange={(e) => setRefreshIntervalSec(e.target.value)}
        />
      </Field>

      <Field>
        <FieldLabel htmlFor="mod-create-cron">Cron (опционально)</FieldLabel>
        <Input
          id="mod-create-cron"
          placeholder="0 * * * *"
          value={cronExpr}
          onChange={(e) => setCronExpr(e.target.value)}
        />
      </Field>

      <CommunitySelect
        id="mod-create-community"
        label="Community по умолчанию"
        value={defaultCommunityId}
        onValueChange={setDefaultCommunityId}
        communities={communities}
        nullable
      />

      {isDomains ? (
        <>
          <SelectField
            id="mod-create-doh-policy"
            label="Политика DoH"
            items={DOH_POLICY_ITEMS}
            value={dohResolverPolicy}
            onValueChange={(v) => {
              if (v) setDohResolverPolicy(v)
            }}
          />

          <Field>
            <FieldLabel>DoH профили</FieldLabel>
            {dohProfiles.length === 0 ? (
              <p className="text-muted-foreground text-sm">Нет профилей в справочнике</p>
            ) : (
              <div className="flex flex-col gap-2 rounded-lg border border-border p-3">
                {dohProfiles.map((p) => {
                  const checked = dohProfileIds.includes(p.id)
                  return (
                    <label
                      key={p.id}
                      htmlFor={`mod-create-doh-${p.id}`}
                      className="flex cursor-pointer items-start gap-3"
                    >
                      <Checkbox
                        id={`mod-create-doh-${p.id}`}
                        checked={checked}
                        onCheckedChange={(v) => toggleDohProfile(p.id, v === true)}
                        className="mt-0.5"
                      />
                      <span className="flex min-w-0 flex-col gap-0.5">
                        <span className="text-sm font-medium">
                          {dohProfileShortLabel(p.id, dohProfiles)}
                        </span>
                        <span className="text-muted-foreground truncate text-xs" title={p.url}>
                          {p.url}
                        </span>
                      </span>
                    </label>
                  )
                })}
              </div>
            )}
          </Field>
        </>
      ) : null}
    </FormDrawer>
  )
}