import { useMutation } from '@tanstack/react-query'
import { useState } from 'react'
import { useTranslation } from 'react-i18next'
import type { OverrideMode, OverrideRecurrence } from '@/shared/api/types'
import { Button } from '@/shared/ui/button'
import { Input } from '@/shared/ui/input'
import { Label } from '@/shared/ui/label'
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/shared/ui/select'
import { createOverride } from '../api'
import { NumberField } from './fields'

export function OverrideForm({
  channelId,
  options,
  onCreated,
  onError,
}: {
  channelId: string
  options: { id: string; name: string }[]
  onCreated: () => void
  onError: (e: unknown) => void
}) {
  const { t } = useTranslation()
  const [mode, setMode] = useState<OverrideMode>('Exclusive')
  const [recurrence, setRecurrence] = useState<OverrideRecurrence>('OneTime')
  const [showId, setShowId] = useState('')
  const [weight, setWeight] = useState(1)
  const [start, setStart] = useState('')
  const [end, setEnd] = useState('')
  // Weekly: день недели (0=Вс..6=Сб) + окна времени суток «HH:MM».
  const [dayOfWeek, setDayOfWeek] = useState(6)
  const [startTime, setStartTime] = useState('')
  const [endTime, setEndTime] = useState('')

  const toMinutes = (hhmm: string) => {
    const [h, m] = hhmm.split(':').map(Number)
    return h * 60 + m
  }
  const weekly = recurrence === 'Weekly'

  const create = useMutation({
    mutationFn: () =>
      createOverride(
        channelId,
        weekly
          ? {
              mode,
              recurrence,
              dayOfWeek,
              startMinute: toMinutes(startTime),
              endMinute: toMinutes(endTime),
              shows: [{ showId, weight }],
            }
          : {
              mode,
              recurrence,
              startsAtUtc: new Date(start).toISOString(),
              endsAtUtc: new Date(end).toISOString(),
              shows: [{ showId, weight }],
            },
      ),
    onSuccess: () => {
      setShowId('')
      setStart('')
      setEnd('')
      setStartTime('')
      setEndTime('')
      onCreated()
    },
    onError,
  })

  const valid = weekly
    ? showId && startTime && endTime && toMinutes(endTime) > toMinutes(startTime)
    : showId && start && end && new Date(end) > new Date(start)

  return (
    <div className="flex flex-wrap items-end gap-2">
      <div className="flex flex-col gap-1.5">
        <Label>{t('admin.channels.overrideRecurrence')}</Label>
        <Select value={recurrence} onValueChange={(v) => setRecurrence(v as OverrideRecurrence)}>
          <SelectTrigger className="w-36">
            <SelectValue />
          </SelectTrigger>
          <SelectContent>
            <SelectItem value="OneTime">{t('admin.channels.recurrenceOneTime')}</SelectItem>
            <SelectItem value="Weekly">{t('admin.channels.recurrenceWeekly')}</SelectItem>
          </SelectContent>
        </Select>
      </div>
      <Select value={mode} onValueChange={(v) => setMode(v as OverrideMode)}>
        <SelectTrigger className="w-36">
          <SelectValue />
        </SelectTrigger>
        <SelectContent>
          <SelectItem value="Exclusive">{t('admin.channels.modes.Exclusive')}</SelectItem>
          <SelectItem value="Boost">{t('admin.channels.modes.Boost')}</SelectItem>
        </SelectContent>
      </Select>
      <Select value={showId} onValueChange={setShowId}>
        <SelectTrigger className="w-44">
          <SelectValue placeholder={t('admin.channels.pickShow')} />
        </SelectTrigger>
        <SelectContent>
          {options.map((o) => (
            <SelectItem key={o.id} value={o.id}>
              {o.name}
            </SelectItem>
          ))}
        </SelectContent>
      </Select>
      {mode === 'Boost' && (
        <NumberField label={t('admin.channels.weight')} value={weight} onChange={setWeight} min={1} />
      )}
      {weekly ? (
        <>
          <div className="flex flex-col gap-1.5">
            <Label>{t('admin.channels.weekday')}</Label>
            <Select value={String(dayOfWeek)} onValueChange={(v) => setDayOfWeek(Number(v))}>
              <SelectTrigger className="w-36">
                <SelectValue />
              </SelectTrigger>
              <SelectContent>
                {[1, 2, 3, 4, 5, 6, 0].map((d) => (
                  <SelectItem key={d} value={String(d)}>
                    {t(`admin.channels.weekdays.${d}`)}
                  </SelectItem>
                ))}
              </SelectContent>
            </Select>
          </div>
          <div className="flex flex-col gap-1.5">
            <Label>{t('admin.channels.from')}</Label>
            <Input type="time" value={startTime} onChange={(e) => setStartTime(e.target.value)} className="w-32" />
          </div>
          <div className="flex flex-col gap-1.5">
            <Label>{t('admin.channels.to')}</Label>
            <Input type="time" value={endTime} onChange={(e) => setEndTime(e.target.value)} className="w-32" />
          </div>
        </>
      ) : (
        <>
          <div className="flex flex-col gap-1.5">
            <Label>{t('admin.channels.from')}</Label>
            <Input type="datetime-local" value={start} onChange={(e) => setStart(e.target.value)} className="w-60" />
          </div>
          <div className="flex flex-col gap-1.5">
            <Label>{t('admin.channels.to')}</Label>
            <Input type="datetime-local" value={end} onChange={(e) => setEnd(e.target.value)} className="w-60" />
          </div>
        </>
      )}
      <Button size="sm" disabled={!valid || create.isPending} onClick={() => create.mutate()}>
        {t('common.create')}
      </Button>
    </div>
  )
}