import { memo, useEffect, useState } from 'react'
import { Dice5 } from 'lucide-react'
import { useTranslation } from 'react-i18next'
import { Button } from '@/components/ui/button'
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogHeader,
  DialogTitle,
} from '@/components/ui/dialog'
import { Label } from '@/components/ui/label'
import { PasswordInput } from '@/components/PasswordInput'
import { userApi } from '@/api'
import { toast } from 'sonner'
import type { User } from '@/types'

// 随机密码：12 位，大小写字母 + 数字，满足后端 min=6
function randomPassword(): string {
  const chars = 'ABCDEFGHJKLMNPQRSTUVWXYZabcdefghjkmnpqrstuvwxyz23456789'
  let pwd = ''
  const array = new Uint32Array(12)
  crypto.getRandomValues(array)
  for (let i = 0; i < 12; i++) {
    pwd += chars[array[i] % chars.length]
  }
  return pwd
}

interface ResetPasswordDialogProps {
  user: User | null
  onClose: () => void
  /** 重置成功回调（提示信息由调用方决定） */
  onReset: () => void
}

/** 管理员重置密码弹窗 — 重置后目标用户全部旧会话立即失效（后端递增 TokenVersion） */
export const ResetPasswordDialog = memo(function ResetPasswordDialog({
  user,
  onClose,
  onReset,
}: ResetPasswordDialogProps) {
  const { t } = useTranslation('users')
  const [password, setPassword] = useState('')
  const [submitting, setSubmitting] = useState(false)
  const [error, setError] = useState('')

  useEffect(() => {
    if (user) {
      setPassword('')
      setError('')
    }
  }, [user])

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault()
    if (password.length < 6) {
      setError(t('form.passwordMin'))
      return
    }
    if (!user) return
    setSubmitting(true)
    try {
      await userApi.resetPassword(user.id, password)
      onClose()
      onReset()
    } catch (err) {
      toast.error(err instanceof Error ? err.message : t('resetFailed'))
    } finally {
      setSubmitting(false)
    }
  }

  return (
    <Dialog open={user !== null} onOpenChange={(open) => !open && onClose()}>
      <DialogContent className="max-w-md">
        <DialogHeader>
          <DialogTitle>{t('resetPassword')}</DialogTitle>
          <DialogDescription>
            {t('resetDesc', { name: user?.username ?? '' })}
          </DialogDescription>
        </DialogHeader>
        <form onSubmit={handleSubmit} className="space-y-4">
          <div className="space-y-2">
            <Label htmlFor="reset-password">{t('newPassword')}</Label>
            <div className="flex gap-2">
              <PasswordInput
                id="reset-password"
                className="flex-1"
                placeholder={t('form.passwordPlaceholder')}
                value={password}
                onChange={(e) => {
                  setPassword(e.target.value)
                  setError('')
                }}
                autoComplete="new-password"
                required
              />
              <Button
                type="button"
                variant="outline"
                aria-label={t('randomPassword')}
                title={t('randomPassword')}
                onClick={() => {
                  setPassword(randomPassword())
                  setError('')
                }}
              >
                <Dice5 className="w-4 h-4" />
              </Button>
            </div>
            {error && <p className="text-sm text-destructive">{error}</p>}
          </div>
          <div className="flex justify-end gap-2">
            <Button type="button" variant="outline" onClick={onClose} disabled={submitting}>
              {t('dialog.cancel', { ns: 'common' })}
            </Button>
            <Button type="submit" disabled={submitting || password.length < 6}>
              {submitting ? t('resetting') : t('resetPassword')}
            </Button>
          </div>
        </form>
      </DialogContent>
    </Dialog>
  )
})