import { useState } from 'react'
import { useForm } from 'react-hook-form'
import { z } from 'zod'
import { zodResolver } from '@hookform/resolvers/zod'
import { Fingerprint, KeyRound, Loader2, Plus, Trash2 } from 'lucide-react'
import { authClient } from '../lib/auth-client'
import { Button, Input, Label } from '../components/ui'

const changePasswordSchema = z
  .object({
    currentPassword: z.string().min(1, 'Ingresá tu contraseña actual'),
    newPassword: z.string().min(8, 'La nueva contraseña debe tener al menos 8 caracteres'),
  })
  .refine((v) => v.currentPassword !== v.newPassword, {
    message: 'La nueva contraseña debe ser distinta',
    path: ['newPassword'],
  })

type ChangePasswordValues = z.infer<typeof changePasswordSchema>

function PasskeyList({ onRefresh }: { onRefresh: () => void }) {
  const { data, isPending } = authClient.useListPasskeys()
  const [deletingId, setDeletingId] = useState<string | null>(null)

  const handleDelete = async (id: string) => {
    setDeletingId(id)
    const { error } = await authClient.$fetch('/passkey/delete-passkey', {
      method: 'POST',
      body: { id },
    })
    setDeletingId(null)
    if (!error) onRefresh()
  }

  if (isPending) {
    return <Loader2 className="size-5 animate-spin text-foreground/40" />
  }

  const passkeys = data ?? []
  if (passkeys.length === 0) {
    return <p className="text-sm text-foreground/60">Todavía no registraste ninguna passkey.</p>
  }

  return (
    <ul className="divide-y divide-border rounded-xl border border-border bg-surface">
      {passkeys.map((passkey) => (
        <li key={passkey.id} className="flex items-center gap-3 px-4 py-3">
          <span className="rounded-lg bg-accent-soft p-2">
            <Fingerprint className="size-4 text-accent" />
          </span>
          <div className="min-w-0 flex-1">
            <p className="truncate text-sm font-medium text-primary">
              {passkey.name ?? 'Passkey'}
            </p>
            <p className="text-xs text-foreground/50">
              {passkey.deviceType === 'singleDevice' ? 'Dispositivo' : 'Llave de seguridad'} ·{' '}
              {new Date(passkey.createdAt).toLocaleDateString('es-AR')}
            </p>
          </div>
          <Button
            size="icon"
            variant="ghost"
            aria-label="Eliminar passkey"
            disabled={deletingId === passkey.id}
            onClick={() => handleDelete(passkey.id)}
          >
            <Trash2 className="size-4 text-danger" />
          </Button>
        </li>
      ))}
    </ul>
  )
}

export function SecurityPage() {
  const [passkeyKeys, setPasskeyKeys] = useState(0)
  const [feedback, setFeedback] = useState<string | null>(null)

  const {
    register,
    handleSubmit,
    reset,
    setError,
    formState: { errors, isSubmitting },
  } = useForm<ChangePasswordValues>({ resolver: zodResolver(changePasswordSchema) })

  const refreshPasskeys = () => {
    setPasskeyKeys((k) => k + 1)
  }

  const handleAddPasskey = async () => {
    setFeedback(null)
    const { error } = await authClient.passkey.addPasskey()
    if (error) setFeedback(`No se pudo agregar: ${error.message}`)
    else {
      setFeedback('Passkey registrada correctamente.')
      refreshPasskeys()
    }
  }

  const onChangePassword = handleSubmit(async ({ currentPassword, newPassword }) => {
    setFeedback(null)
    const { error } = await authClient.changePassword({
      currentPassword,
      newPassword,
      revokeOtherSessions: true,
    })
    if (error) {
      setError('currentPassword', { message: error.message ?? 'No se pudo cambiar la contraseña' })
      return
    }
    reset({ currentPassword: '', newPassword: '' })
    setFeedback('Contraseña actualizada.')
  })

  return (
    <section className="space-y-6">
      <div>
        <h1 className="text-2xl font-bold text-primary">Seguridad</h1>
        <p className="mt-1 text-sm text-foreground/60">
          Gestioná tu contraseña y tus llaves de acceso (passkeys).
        </p>
      </div>

      {feedback ? (
        <p className="rounded-xl bg-accent-soft px-4 py-3 text-sm text-accent-strong">{feedback}</p>
      ) : null}

      <div className="rounded-xl border border-border bg-surface p-5">
        <div className="mb-4 flex items-center gap-2">
          <KeyRound className="size-4 text-accent" />
          <h2 className="text-base font-semibold text-primary">Cambiar contraseña</h2>
        </div>
        <form onSubmit={onChangePassword} className="space-y-4">
          <div>
            <Label htmlFor="currentPassword">Contraseña actual</Label>
            <Input
              id="currentPassword"
              type="password"
              autoComplete="current-password"
              invalid={!!errors.currentPassword}
              {...register('currentPassword')}
            />
            {errors.currentPassword ? (
              <p className="mt-1 text-sm text-danger">{errors.currentPassword.message}</p>
            ) : null}
          </div>
          <div>
            <Label htmlFor="newPassword">Nueva contraseña</Label>
            <Input
              id="newPassword"
              type="password"
              autoComplete="new-password"
              invalid={!!errors.newPassword}
              {...register('newPassword')}
            />
            {errors.newPassword ? (
              <p className="mt-1 text-sm text-danger">{errors.newPassword.message}</p>
            ) : null}
          </div>
          <Button type="submit" variant="primary" disabled={isSubmitting}>
            {isSubmitting ? <Loader2 className="size-4 animate-spin" /> : null}
            Actualizar contraseña
          </Button>
        </form>
      </div>

      <div className="rounded-xl border border-border bg-surface p-5">
        <div className="mb-4 flex items-center justify-between">
          <div className="flex items-center gap-2">
            <Fingerprint className="size-4 text-accent" />
            <h2 className="text-base font-semibold text-primary">Passkeys</h2>
          </div>
          <Button variant="outline" size="sm" onClick={handleAddPasskey}>
            <Plus className="size-4" />
            Registrar
          </Button>
        </div>
        <PasskeyList key={passkeyKeys} onRefresh={refreshPasskeys} />
      </div>
    </section>
  )
}