import { useState } from 'react'
import { useMutation, useQueryClient } from '@tanstack/react-query'
import { useTranslation } from 'react-i18next'
import { toast } from '@/shared/ui/toast-store'
import { Card, CardContent, CardHeader, CardTitle } from '@/shared/ui/card'
import { Badge } from '@/shared/ui/badge'
import { Button } from '@/shared/ui/button'
import { Label } from '@/shared/ui/label'
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/shared/ui/select'
import { HttpError } from '@/shared/api/client'
import type { BillingStatusDto, PaymentPeriod } from '@/shared/api/types'
import { cancelPaymentRequest, createPaymentRequest, markPaymentSent, sendRequisitesToTelegram } from './api'

const PERIODS: PaymentPeriod[] = ['Quarter', 'HalfYear', 'Year']

export function PaymentRequestPanel({ status }: { status: BillingStatusDto }) {
  const { t } = useTranslation()
  const queryClient = useQueryClient()
  const [period, setPeriod] = useState<PaymentPeriod>('Quarter')

  const invalidate = () => queryClient.invalidateQueries({ queryKey: ['my-billing-status'] })

  const createMutation = useMutation({
    mutationFn: () => createPaymentRequest(period),
    onSuccess: async () => {
      toast.success(t('billing.requestCreated'))
      await invalidate()
    },
    onError: (error) => toast.error(error instanceof HttpError ? error.detail : t('auth.genericError')),
  })

  const cancelMutation = useMutation({
    mutationFn: (id: string) => cancelPaymentRequest(id),
    onSuccess: async () => {
      toast.success(t('billing.requestCancelled'))
      await invalidate()
    },
    onError: (error) => toast.error(error instanceof HttpError ? error.detail : t('auth.genericError')),
  })

  const markPaidMutation = useMutation({
    mutationFn: (id: string) => markPaymentSent(id),
    onSuccess: async () => {
      toast.success(t('billing.markedPaid'))
      await invalidate()
    },
    onError: (error) => toast.error(error instanceof HttpError ? error.detail : t('auth.genericError')),
  })

  const sendToTelegramMutation = useMutation({
    mutationFn: (id: string) => sendRequisitesToTelegram(id),
    onSuccess: () => toast.success(t('billing.requisitesSent')),
    onError: (error) => {
      const message =
        error instanceof HttpError && error.status === 409 ? t('billing.telegramNotLinked') : t('auth.genericError')
      toast.error(message)
    },
  })

  const request = status.activeRequest

  if (!request) {
    return (
      <Card>
        <CardHeader>
          <CardTitle className="text-base">{t('billing.newRequest')}</CardTitle>
        </CardHeader>
        <CardContent className="flex flex-col gap-4">
          <div className="flex flex-col gap-1.5">
            <Label>{t('billing.period')}</Label>
            <Select value={period} onValueChange={(v) => setPeriod(v as PaymentPeriod)}>
              <SelectTrigger>
                <SelectValue />
              </SelectTrigger>
              <SelectContent>
                {PERIODS.map((p) => (
                  <SelectItem key={p} value={p}>
                    {t(`billing.periods.${p}`)}
                  </SelectItem>
                ))}
              </SelectContent>
            </Select>
          </div>
          <div>
            <Button onClick={() => createMutation.mutate()} disabled={createMutation.isPending}>
              {t('billing.createRequest')}
            </Button>
          </div>
        </CardContent>
      </Card>
    )
  }

  const isAwaitingConfirmation = request.status === 'AwaitingConfirmation'

  return (
    <Card>
      <CardHeader className="flex-row items-center justify-between gap-2 space-y-0">
        <CardTitle className="text-base">{t('billing.activeRequest')}</CardTitle>
        <Badge variant={isAwaitingConfirmation ? 'warning' : 'outline'}>
          {t(`billing.requestStatus.${request.status}`)}
        </Badge>
      </CardHeader>
      <CardContent className="flex flex-col gap-4">
        <p className="text-sm">
          {t(`billing.periods.${request.period}`)} — <span className="font-medium">{request.amountSnapshot} ₽</span>
        </p>

        {!isAwaitingConfirmation && (
          <div className="flex flex-col gap-1.5">
            <Label>{t('billing.requisites')}</Label>
            <p className="whitespace-pre-wrap rounded-md border border-border bg-muted px-3 py-2 text-sm">
              {status.requisitesText || t('billing.requisitesMissing')}
            </p>
          </div>
        )}

        <div className="flex flex-wrap gap-2">
          <Button
            size="sm"
            variant="outline"
            onClick={() => sendToTelegramMutation.mutate(request.id)}
            disabled={sendToTelegramMutation.isPending}
          >
            {t('billing.sendToTelegram')}
          </Button>
          {!isAwaitingConfirmation && (
            <>
              <Button
                size="sm"
                onClick={() => markPaidMutation.mutate(request.id)}
                disabled={markPaidMutation.isPending}
              >
                {t('billing.iPaid')}
              </Button>
              <Button
                size="sm"
                variant="ghost"
                onClick={() => {
                  if (confirm(t('billing.confirmCancel'))) cancelMutation.mutate(request.id)
                }}
                disabled={cancelMutation.isPending}
              >
                {t('billing.cancelRequest')}
              </Button>
            </>
          )}
        </div>
        {isAwaitingConfirmation && <p className="text-xs text-muted-foreground">{t('billing.awaitingAdminHint')}</p>}
      </CardContent>
    </Card>
  )
}