import { zodResolver } from '@hookform/resolvers/zod'
import { createFileRoute, useNavigate } from '@tanstack/react-router'
import { useForm } from 'react-hook-form'
import { useTranslation } from 'react-i18next'
import { z } from 'zod'
import { changePassword, changeUserName, clearSession, deleteAccount } from '@/features/auth/api'
import { useAuthStore } from '@/features/auth/store'
import { useRequireAuth } from '@/features/auth/guards'
import { HttpError } from '@/shared/api/client'
import { Button } from '@/shared/ui/button'
import { Card, CardContent, CardHeader, CardTitle } from '@/shared/ui/card'
import { Input } from '@/shared/ui/input'
import { Label } from '@/shared/ui/label'
import { toast } from '@/shared/ui/toast-store'

export const Route = createFileRoute('/settings')({ component: SettingsPage })

const userNameSchema = z.object({ newUserName: z.string().min(3).max(64) })
const passwordSchema = z.object({
  currentPassword: z.string().min(1),
  newPassword: z.string().min(8),
})

function SettingsPage() {
  const { t } = useTranslation()
  const { isReady } = useRequireAuth()
  const navigate = useNavigate()

  const userNameForm = useForm<z.infer<typeof userNameSchema>>({
    resolver: zodResolver(userNameSchema),
  })
  const passwordForm = useForm<z.infer<typeof passwordSchema>>({
    resolver: zodResolver(passwordSchema),
  })

  if (!isReady) return null

  const onSaveUserName = async (values: z.infer<typeof userNameSchema>) => {
    try {
      await changeUserName(values.newUserName)
      useAuthStore
        .getState()
        .setUser({ ...useAuthStore.getState().user!, userName: values.newUserName })
      toast.success(t('settings.saved'))
      userNameForm.reset()
    } catch (error) {
      toast.error(
        error instanceof HttpError && error.status === 409
          ? t('auth.userNameTaken')
          : t('common.error'),
      )
    }
  }

  const onSavePassword = async (values: z.infer<typeof passwordSchema>) => {
    try {
      await changePassword(values.currentPassword, values.newPassword)
      toast.success(t('settings.saved'))
      passwordForm.reset()
    } catch {
      toast.error(t('common.error'))
    }
  }

  const onDeleteAccount = async () => {
    if (!window.confirm(t('settings.deleteAccountConfirm'))) return
    try {
      await deleteAccount()
      clearSession()
      void navigate({ to: '/' })
    } catch {
      toast.error(t('common.error'))
    }
  }

  return (
    <div className="flex flex-col gap-6">
      <h1 className="crt-glow text-2xl font-bold">{t('settings.title')}</h1>

      <Card>
        <CardHeader>
          <CardTitle>{t('settings.changeUserName')}</CardTitle>
        </CardHeader>
        <CardContent>
          <form
            className="flex flex-col gap-4"
            onSubmit={userNameForm.handleSubmit(onSaveUserName)}
          >
            <div className="flex flex-col gap-1.5">
              <Label htmlFor="newUserName">{t('settings.newUserName')}</Label>
              <Input id="newUserName" {...userNameForm.register('newUserName')} />
            </div>
            <Button
              type="submit"
              className="self-start"
              disabled={userNameForm.formState.isSubmitting}
            >
              {t('common.save')}
            </Button>
          </form>
        </CardContent>
      </Card>

      <Card>
        <CardHeader>
          <CardTitle>{t('settings.changePassword')}</CardTitle>
        </CardHeader>
        <CardContent>
          <form
            className="flex flex-col gap-4"
            onSubmit={passwordForm.handleSubmit(onSavePassword)}
          >
            <div className="flex flex-col gap-1.5">
              <Label htmlFor="currentPassword">{t('settings.currentPassword')}</Label>
              <Input
                id="currentPassword"
                type="password"
                {...passwordForm.register('currentPassword')}
              />
            </div>
            <div className="flex flex-col gap-1.5">
              <Label htmlFor="newPassword">{t('settings.newPassword')}</Label>
              <Input id="newPassword" type="password" {...passwordForm.register('newPassword')} />
            </div>
            <Button
              type="submit"
              className="self-start"
              disabled={passwordForm.formState.isSubmitting}
            >
              {t('common.save')}
            </Button>
          </form>
        </CardContent>
      </Card>

      <Card className="border-red-700/40">
        <CardHeader>
          <CardTitle className="text-red-500">{t('settings.dangerZone')}</CardTitle>
        </CardHeader>
        <CardContent>
          <Button variant="destructive" onClick={() => void onDeleteAccount()}>
            {t('settings.deleteAccount')}
          </Button>
        </CardContent>
      </Card>
    </div>
  )
}